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  * Copyright (c) 2006-2012 Patrick McHardy <kaber@trash.net>
   6  *
   7  * This source code is licensed under General Public License version 2.
   8  *
   9  * Based on the 'brute force' H.323 connection tracking module by
  10  * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
  11  *
  12  * For more information, please see http://nath323.sourceforge.net/
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/ctype.h>
  18 #include <linux/inet.h>
  19 #include <linux/in.h>
  20 #include <linux/ip.h>
  21 #include <linux/slab.h>
  22 #include <linux/udp.h>
  23 #include <linux/tcp.h>
  24 #include <linux/skbuff.h>
  25 #include <net/route.h>
  26 #include <net/ip6_route.h>
  27 #include <linux/netfilter_ipv6.h>
  28
  29 #include <net/netfilter/nf_conntrack.h>
  30 #include <net/netfilter/nf_conntrack_core.h>
  31 #include <net/netfilter/nf_conntrack_tuple.h>
  32 #include <net/netfilter/nf_conntrack_expect.h>
  33 #include <net/netfilter/nf_conntrack_ecache.h>
  34 #include <net/netfilter/nf_conntrack_helper.h>
  35 #include <net/netfilter/nf_conntrack_zones.h>
  36 #include <linux/netfilter/nf_conntrack_h323.h>
  37
  38 /* Parameters */
  39 static unsigned int default_rrq_ttl __read_mostly = 300;
  40 module_param(default_rrq_ttl, uint, 0600);
  41 MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
  42
  43 static int gkrouted_only __read_mostly = 1;
  44 module_param(gkrouted_only, int, 0600);
  45 MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
  46
  47 static bool callforward_filter __read_mostly = true;
  48 module_param(callforward_filter, bool, 0600);
  49 MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
  50                                      "if both endpoints are on different sides "
  51                                      "(determined by routing information)");
  52
  53 /* Hooks for NAT */
  54 int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff,
  55                            unsigned char **data, int dataoff,
  56                            H245_TransportAddress *taddr,
  57                            union nf_inet_addr *addr, __be16 port)
  58                            __read_mostly;
  59 int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff,
  60                            unsigned char **data, int dataoff,
  61                            TransportAddress *taddr,
  62                            union nf_inet_addr *addr, __be16 port)
  63                            __read_mostly;
  64 int (*set_sig_addr_hook) (struct sk_buff *skb,
  65                           struct nf_conn *ct,
  66                           enum ip_conntrack_info ctinfo,
  67                           unsigned int protoff, unsigned char **data,
  68                           TransportAddress *taddr, int count) __read_mostly;
  69 int (*set_ras_addr_hook) (struct sk_buff *skb,
  70                           struct nf_conn *ct,
  71                           enum ip_conntrack_info ctinfo,
  72                           unsigned int protoff, unsigned char **data,
  73                           TransportAddress *taddr, int count) __read_mostly;
  74 int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
  75                           struct nf_conn *ct,
  76                           enum ip_conntrack_info ctinfo,
  77                           unsigned int protoff,
  78                           unsigned char **data, int dataoff,
  79                           H245_TransportAddress *taddr,
  80                           __be16 port, __be16 rtp_port,
  81                           struct nf_conntrack_expect *rtp_exp,
  82                           struct nf_conntrack_expect *rtcp_exp) __read_mostly;
  83 int (*nat_t120_hook) (struct sk_buff *skb,
  84                       struct nf_conn *ct,
  85                       enum ip_conntrack_info ctinfo,
  86                       unsigned int protoff,
  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 *skb,
  91                       struct nf_conn *ct,
  92                       enum ip_conntrack_info ctinfo,
  93                       unsigned int protoff,
  94                       unsigned char **data, int dataoff,
  95                       TransportAddress *taddr, __be16 port,
  96                       struct nf_conntrack_expect *exp) __read_mostly;
  97 int (*nat_callforwarding_hook) (struct sk_buff *skb,
  98                                 struct nf_conn *ct,
  99                                 enum ip_conntrack_info ctinfo,
 100                                 unsigned int protoff,
 101                                 unsigned char **data, int dataoff,
 102                                 TransportAddress *taddr, __be16 port,
 103                                 struct nf_conntrack_expect *exp) __read_mostly;
 104 int (*nat_q931_hook) (struct sk_buff *skb,
 105                       struct nf_conn *ct,
 106                       enum ip_conntrack_info ctinfo,
 107                       unsigned int protoff,
 108                       unsigned char **data, TransportAddress *taddr, int idx,
 109                       __be16 port, struct nf_conntrack_expect *exp)
 110                       __read_mostly;
 111
 112 static DEFINE_SPINLOCK(nf_h323_lock);
 113 static char *h323_buffer;
 114
 115 static struct nf_conntrack_helper nf_conntrack_helper_h245;
 116 static struct nf_conntrack_helper nf_conntrack_helper_q931[];
 117 static struct nf_conntrack_helper nf_conntrack_helper_ras[];
 118
 119 static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
 120                          struct nf_conn *ct, enum ip_conntrack_info ctinfo,
 121                          unsigned char **data, int *datalen, int *dataoff)
 122 {
 123         struct nf_ct_h323_master *info = nfct_help_data(ct);
 124         int dir = CTINFO2DIR(ctinfo);
 125         const struct tcphdr *th;
 126         struct tcphdr _tcph;
 127         int tcpdatalen;
 128         int tcpdataoff;
 129         unsigned char *tpkt;
 130         int tpktlen;
 131         int tpktoff;
 132
 133         /* Get TCP header */
 134         th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
 135         if (th == NULL)
 136                 return 0;
 137
 138         /* Get TCP data offset */
 139         tcpdataoff = protoff + th->doff * 4;
 140
 141         /* Get TCP data length */
 142         tcpdatalen = skb->len - tcpdataoff;
 143         if (tcpdatalen <= 0)    /* No TCP data */
 144                 goto clear_out;
 145
 146         if (*data == NULL) {    /* first TPKT */
 147                 /* Get first TPKT pointer */
 148                 tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
 149                                           h323_buffer);
 150                 BUG_ON(tpkt == NULL);
 151
 152                 /* Validate TPKT identifier */
 153                 if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
 154                         /* Netmeeting sends TPKT header and data separately */
 155                         if (info->tpkt_len[dir] > 0) {
 156                                 pr_debug("nf_ct_h323: previous packet "
 157                                          "indicated separate TPKT data of %hu "
 158                                          "bytes\n", info->tpkt_len[dir]);
 159                                 if (info->tpkt_len[dir] <= tcpdatalen) {
 160                                         /* Yes, there was a TPKT header
 161                                          * received */
 162                                         *data = tpkt;
 163                                         *datalen = info->tpkt_len[dir];
 164                                         *dataoff = 0;
 165                                         goto out;
 166                                 }
 167
 168                                 /* Fragmented TPKT */
 169                                 pr_debug("nf_ct_h323: fragmented TPKT\n");
 170                                 goto clear_out;
 171                         }
 172
 173                         /* It is not even a TPKT */
 174                         return 0;
 175                 }
 176                 tpktoff = 0;
 177         } else {                /* Next TPKT */
 178                 tpktoff = *dataoff + *datalen;
 179                 tcpdatalen -= tpktoff;
 180                 if (tcpdatalen <= 4)    /* No more TPKT */
 181                         goto clear_out;
 182                 tpkt = *data + *datalen;
 183
 184                 /* Validate TPKT identifier */
 185                 if (tpkt[0] != 0x03 || tpkt[1] != 0)
 186                         goto clear_out;
 187         }
 188
 189         /* Validate TPKT length */
 190         tpktlen = tpkt[2] * 256 + tpkt[3];
 191         if (tpktlen < 4)
 192                 goto clear_out;
 193         if (tpktlen > tcpdatalen) {
 194                 if (tcpdatalen == 4) {  /* Separate TPKT header */
 195                         /* Netmeeting sends TPKT header and data separately */
 196                         pr_debug("nf_ct_h323: separate TPKT header indicates "
 197                                  "there will be TPKT data of %hu bytes\n",
 198                                  tpktlen - 4);
 199                         info->tpkt_len[dir] = tpktlen - 4;
 200                         return 0;
 201                 }
 202
 203                 pr_debug("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 static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
 223                          H245_TransportAddress *taddr,
 224                          union nf_inet_addr *addr, __be16 *port)
 225 {
 226         const unsigned char *p;
 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 (nf_ct_l3num(ct) != AF_INET)
 235                         return 0;
 236                 p = data + taddr->unicastAddress.iPAddress.network;
 237                 len = 4;
 238                 break;
 239         case eUnicastAddress_iP6Address:
 240                 if (nf_ct_l3num(ct) != 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 static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
 257                            enum ip_conntrack_info ctinfo,
 258                            unsigned int protoff,
 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_inet_addr 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         rtp_port = port & ~htons(1);
 279         rtcp_port = port | htons(1);
 280
 281         /* Create expect for RTP */
 282         if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
 283                 return -1;
 284         nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
 285                           &ct->tuplehash[!dir].tuple.src.u3,
 286                           &ct->tuplehash[!dir].tuple.dst.u3,
 287                           IPPROTO_UDP, NULL, &rtp_port);
 288
 289         /* Create expect for RTCP */
 290         if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
 291                 nf_ct_expect_put(rtp_exp);
 292                 return -1;
 293         }
 294         nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
 295                           &ct->tuplehash[!dir].tuple.src.u3,
 296                           &ct->tuplehash[!dir].tuple.dst.u3,
 297                           IPPROTO_UDP, NULL, &rtcp_port);
 298
 299         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 300                    &ct->tuplehash[!dir].tuple.dst.u3,
 301                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 302                    (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
 303                    nf_ct_l3num(ct) == NFPROTO_IPV4 &&
 304                    ct->status & IPS_NAT_MASK) {
 305                 /* NAT needed */
 306                 ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, 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                                 pr_debug("nf_ct_h323: expect RTP ");
 312                                 nf_ct_dump_tuple(&rtp_exp->tuple);
 313                                 pr_debug("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 static int expect_t120(struct sk_buff *skb,
 330                        struct nf_conn *ct,
 331                        enum ip_conntrack_info ctinfo,
 332                        unsigned int protoff,
 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_inet_addr 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, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
 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             nf_ct_l3num(ct) == NFPROTO_IPV4 &&
 363             ct->status & IPS_NAT_MASK) {
 364                 /* NAT needed */
 365                 ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr,
 366                                port, exp);
 367         } else {                /* Conntrack only */
 368                 if (nf_ct_expect_related(exp) == 0) {
 369                         pr_debug("nf_ct_h323: expect T.120 ");
 370                         nf_ct_dump_tuple(&exp->tuple);
 371                 } else
 372                         ret = -1;
 373         }
 374
 375         nf_ct_expect_put(exp);
 376
 377         return ret;
 378 }
 379
 380 static int process_h245_channel(struct sk_buff *skb,
 381                                 struct nf_conn *ct,
 382                                 enum ip_conntrack_info ctinfo,
 383                                 unsigned int protoff,
 384                                 unsigned char **data, int dataoff,
 385                                 H2250LogicalChannelParameters *channel)
 386 {
 387         int ret;
 388
 389         if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
 390                 /* RTP */
 391                 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
 392                                       &channel->mediaChannel);
 393                 if (ret < 0)
 394                         return -1;
 395         }
 396
 397         if (channel->
 398             options & eH2250LogicalChannelParameters_mediaControlChannel) {
 399                 /* RTCP */
 400                 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff,
 401                                       &channel->mediaControlChannel);
 402                 if (ret < 0)
 403                         return -1;
 404         }
 405
 406         return 0;
 407 }
 408
 409 static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
 410                        enum ip_conntrack_info ctinfo,
 411                        unsigned int protoff,
 412                        unsigned char **data, int dataoff,
 413                        OpenLogicalChannel *olc)
 414 {
 415         int ret;
 416
 417         pr_debug("nf_ct_h323: OpenLogicalChannel\n");
 418
 419         if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
 420             eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
 421         {
 422                 ret = process_h245_channel(skb, ct, ctinfo,
 423                                            protoff, 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(skb, ct, ctinfo,
 442                                          protoff, data, dataoff,
 443                                          &olc->
 444                                          reverseLogicalChannelParameters.
 445                                          multiplexParameters.
 446                                          h2250LogicalChannelParameters);
 447                 if (ret < 0)
 448                         return -1;
 449         }
 450
 451         if ((olc->options & eOpenLogicalChannel_separateStack) &&
 452             olc->forwardLogicalChannelParameters.dataType.choice ==
 453             eDataType_data &&
 454             olc->forwardLogicalChannelParameters.dataType.data.application.
 455             choice == eDataApplicationCapability_application_t120 &&
 456             olc->forwardLogicalChannelParameters.dataType.data.application.
 457             t120.choice == eDataProtocolCapability_separateLANStack &&
 458             olc->separateStack.networkAddress.choice ==
 459             eNetworkAccessParameters_networkAddress_localAreaAddress) {
 460                 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
 461                                   &olc->separateStack.networkAddress.
 462                                   localAreaAddress);
 463                 if (ret < 0)
 464                         return -1;
 465         }
 466
 467         return 0;
 468 }
 469
 470 static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
 471                         enum ip_conntrack_info ctinfo,
 472                         unsigned int protoff, unsigned char **data, int dataoff,
 473                         OpenLogicalChannelAck *olca)
 474 {
 475         H2250LogicalChannelAckParameters *ack;
 476         int ret;
 477
 478         pr_debug("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(skb, ct, ctinfo,
 489                                            protoff, data, dataoff,
 490                                            &olca->
 491                                            reverseLogicalChannelParameters.
 492                                            multiplexParameters.
 493                                            h2250LogicalChannelParameters);
 494                 if (ret < 0)
 495                         return -1;
 496         }
 497
 498         if ((olca->options &
 499              eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
 500             (olca->forwardMultiplexAckParameters.choice ==
 501              eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
 502         {
 503                 ack = &olca->forwardMultiplexAckParameters.
 504                     h2250LogicalChannelAckParameters;
 505                 if (ack->options &
 506                     eH2250LogicalChannelAckParameters_mediaChannel) {
 507                         /* RTP */
 508                         ret = expect_rtp_rtcp(skb, ct, ctinfo,
 509                                               protoff, data, dataoff,
 510                                               &ack->mediaChannel);
 511                         if (ret < 0)
 512                                 return -1;
 513                 }
 514
 515                 if (ack->options &
 516                     eH2250LogicalChannelAckParameters_mediaControlChannel) {
 517                         /* RTCP */
 518                         ret = expect_rtp_rtcp(skb, ct, ctinfo,
 519                                               protoff, data, dataoff,
 520                                               &ack->mediaControlChannel);
 521                         if (ret < 0)
 522                                 return -1;
 523                 }
 524         }
 525
 526         if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
 527                 olca->separateStack.networkAddress.choice ==
 528                 eNetworkAccessParameters_networkAddress_localAreaAddress) {
 529                 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff,
 530                                   &olca->separateStack.networkAddress.
 531                                   localAreaAddress);
 532                 if (ret < 0)
 533                         return -1;
 534         }
 535
 536         return 0;
 537 }
 538
 539 static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
 540                         enum ip_conntrack_info ctinfo,
 541                         unsigned int protoff, unsigned char **data, int dataoff,
 542                         MultimediaSystemControlMessage *mscm)
 543 {
 544         switch (mscm->choice) {
 545         case eMultimediaSystemControlMessage_request:
 546                 if (mscm->request.choice ==
 547                     eRequestMessage_openLogicalChannel) {
 548                         return process_olc(skb, ct, ctinfo,
 549                                            protoff, data, dataoff,
 550                                            &mscm->request.openLogicalChannel);
 551                 }
 552                 pr_debug("nf_ct_h323: H.245 Request %d\n",
 553                          mscm->request.choice);
 554                 break;
 555         case eMultimediaSystemControlMessage_response:
 556                 if (mscm->response.choice ==
 557                     eResponseMessage_openLogicalChannelAck) {
 558                         return process_olca(skb, ct, ctinfo,
 559                                             protoff, data, dataoff,
 560                                             &mscm->response.
 561                                             openLogicalChannelAck);
 562                 }
 563                 pr_debug("nf_ct_h323: H.245 Response %d\n",
 564                          mscm->response.choice);
 565                 break;
 566         default:
 567                 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
 568                 break;
 569         }
 570
 571         return 0;
 572 }
 573
 574 static int h245_help(struct sk_buff *skb, unsigned int protoff,
 575                      struct nf_conn *ct, enum ip_conntrack_info ctinfo)
 576 {
 577         static MultimediaSystemControlMessage mscm;
 578         unsigned char *data = NULL;
 579         int datalen;
 580         int dataoff;
 581         int ret;
 582
 583         /* Until there's been traffic both ways, don't look in packets. */
 584         if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
 585                 return NF_ACCEPT;
 586
 587         pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
 588
 589         spin_lock_bh(&nf_h323_lock);
 590
 591         /* Process each TPKT */
 592         while (get_tpkt_data(skb, protoff, ct, ctinfo,
 593                              &data, &datalen, &dataoff)) {
 594                 pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
 595                 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
 596
 597                 /* Decode H.245 signal */
 598                 ret = DecodeMultimediaSystemControlMessage(data, datalen,
 599                                                            &mscm);
 600                 if (ret < 0) {
 601                         pr_debug("nf_ct_h245: decoding error: %s\n",
 602                                  ret == H323_ERROR_BOUND ?
 603                                  "out of bound" : "out of range");
 604                         /* We don't drop when decoding error */
 605                         break;
 606                 }
 607
 608                 /* Process H.245 signal */
 609                 if (process_h245(skb, ct, ctinfo, protoff,
 610                                  &data, dataoff, &mscm) < 0)
 611                         goto drop;
 612         }
 613
 614         spin_unlock_bh(&nf_h323_lock);
 615         return NF_ACCEPT;
 616
 617       drop:
 618         spin_unlock_bh(&nf_h323_lock);
 619         nf_ct_helper_log(skb, ct, "cannot process H.245 message");
 620         return NF_DROP;
 621 }
 622
 623 static const struct nf_conntrack_expect_policy h245_exp_policy = {
 624         .max_expected   = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
 625         .timeout        = 240,
 626 };
 627
 628 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
 629         .name                   = "H.245",
 630         .me                     = THIS_MODULE,
 631         .tuple.src.l3num        = AF_UNSPEC,
 632         .tuple.dst.protonum     = IPPROTO_UDP,
 633         .help                   = h245_help,
 634         .expect_policy          = &h245_exp_policy,
 635 };
 636
 637 int get_h225_addr(struct nf_conn *ct, unsigned char *data,
 638                   TransportAddress *taddr,
 639                   union nf_inet_addr *addr, __be16 *port)
 640 {
 641         const unsigned char *p;
 642         int len;
 643
 644         switch (taddr->choice) {
 645         case eTransportAddress_ipAddress:
 646                 if (nf_ct_l3num(ct) != AF_INET)
 647                         return 0;
 648                 p = data + taddr->ipAddress.ip;
 649                 len = 4;
 650                 break;
 651         case eTransportAddress_ip6Address:
 652                 if (nf_ct_l3num(ct) != AF_INET6)
 653                         return 0;
 654                 p = data + taddr->ip6Address.ip;
 655                 len = 16;
 656                 break;
 657         default:
 658                 return 0;
 659         }
 660
 661         memcpy(addr, p, len);
 662         memset((void *)addr + len, 0, sizeof(*addr) - len);
 663         memcpy(port, p + len, sizeof(__be16));
 664
 665         return 1;
 666 }
 667
 668 static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
 669                        enum ip_conntrack_info ctinfo,
 670                        unsigned int protoff, unsigned char **data, int dataoff,
 671                        TransportAddress *taddr)
 672 {
 673         int dir = CTINFO2DIR(ctinfo);
 674         int ret = 0;
 675         __be16 port;
 676         union nf_inet_addr 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_ct_expect_alloc(ct)) == NULL)
 688                 return -1;
 689         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
 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             nf_ct_l3num(ct) == NFPROTO_IPV4 &&
 700             ct->status & IPS_NAT_MASK) {
 701                 /* NAT needed */
 702                 ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr,
 703                                port, exp);
 704         } else {                /* Conntrack only */
 705                 if (nf_ct_expect_related(exp) == 0) {
 706                         pr_debug("nf_ct_q931: expect H.245 ");
 707                         nf_ct_dump_tuple(&exp->tuple);
 708                 } else
 709                         ret = -1;
 710         }
 711
 712         nf_ct_expect_put(exp);
 713
 714         return ret;
 715 }
 716
 717 /* If the calling party is on the same side of the forward-to party,
 718  * we don't need to track the second call
 719  */
 720 static int callforward_do_filter(struct net *net,
 721                                  const union nf_inet_addr *src,
 722                                  const union nf_inet_addr *dst,
 723                                  u_int8_t family)
 724 {
 725         int ret = 0;
 726
 727         switch (family) {
 728         case AF_INET: {
 729                 struct flowi4 fl1, fl2;
 730                 struct rtable *rt1, *rt2;
 731
 732                 memset(&fl1, 0, sizeof(fl1));
 733                 fl1.daddr = src->ip;
 734
 735                 memset(&fl2, 0, sizeof(fl2));
 736                 fl2.daddr = dst->ip;
 737                 if (!nf_ip_route(net, (struct dst_entry **)&rt1,
 738                                  flowi4_to_flowi(&fl1), false)) {
 739                         if (!nf_ip_route(net, (struct dst_entry **)&rt2,
 740                                          flowi4_to_flowi(&fl2), false)) {
 741                                 if (rt_nexthop(rt1, fl1.daddr) ==
 742                                     rt_nexthop(rt2, fl2.daddr) &&
 743                                     rt1->dst.dev  == rt2->dst.dev)
 744                                         ret = 1;
 745                                 dst_release(&rt2->dst);
 746                         }
 747                         dst_release(&rt1->dst);
 748                 }
 749                 break;
 750         }
 751 #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6)
 752         case AF_INET6: {
 753                 const struct nf_ipv6_ops *v6ops;
 754                 struct rt6_info *rt1, *rt2;
 755                 struct flowi6 fl1, fl2;
 756
 757                 v6ops = nf_get_ipv6_ops();
 758                 if (!v6ops)
 759                         return 0;
 760
 761                 memset(&fl1, 0, sizeof(fl1));
 762                 fl1.daddr = src->in6;
 763
 764                 memset(&fl2, 0, sizeof(fl2));
 765                 fl2.daddr = dst->in6;
 766                 if (!v6ops->route(net, (struct dst_entry **)&rt1,
 767                                   flowi6_to_flowi(&fl1), false)) {
 768                         if (!v6ops->route(net, (struct dst_entry **)&rt2,
 769                                           flowi6_to_flowi(&fl2), false)) {
 770                                 if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr),
 771                                                     rt6_nexthop(rt2, &fl2.daddr)) &&
 772                                     rt1->dst.dev == rt2->dst.dev)
 773                                         ret = 1;
 774                                 dst_release(&rt2->dst);
 775                         }
 776                         dst_release(&rt1->dst);
 777                 }
 778                 break;
 779         }
 780 #endif
 781         }
 782         return ret;
 783
 784 }
 785
 786 static int expect_callforwarding(struct sk_buff *skb,
 787                                  struct nf_conn *ct,
 788                                  enum ip_conntrack_info ctinfo,
 789                                  unsigned int protoff,
 790                                  unsigned char **data, int dataoff,
 791                                  TransportAddress *taddr)
 792 {
 793         int dir = CTINFO2DIR(ctinfo);
 794         int ret = 0;
 795         __be16 port;
 796         union nf_inet_addr addr;
 797         struct nf_conntrack_expect *exp;
 798         struct net *net = nf_ct_net(ct);
 799         typeof(nat_callforwarding_hook) nat_callforwarding;
 800
 801         /* Read alternativeAddress */
 802         if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
 803                 return 0;
 804
 805         /* If the calling party is on the same side of the forward-to party,
 806          * we don't need to track the second call
 807          */
 808         if (callforward_filter &&
 809             callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3,
 810                                   nf_ct_l3num(ct))) {
 811                 pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
 812                 return 0;
 813         }
 814
 815         /* Create expect for the second call leg */
 816         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
 817                 return -1;
 818         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
 819                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
 820                           IPPROTO_TCP, NULL, &port);
 821         exp->helper = nf_conntrack_helper_q931;
 822
 823         if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 824                    &ct->tuplehash[!dir].tuple.dst.u3,
 825                    sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 826             (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
 827             nf_ct_l3num(ct) == NFPROTO_IPV4 &&
 828             ct->status & IPS_NAT_MASK) {
 829                 /* Need NAT */
 830                 ret = nat_callforwarding(skb, ct, ctinfo,
 831                                          protoff, data, dataoff,
 832                                          taddr, port, exp);
 833         } else {                /* Conntrack only */
 834                 if (nf_ct_expect_related(exp) == 0) {
 835                         pr_debug("nf_ct_q931: expect Call Forwarding ");
 836                         nf_ct_dump_tuple(&exp->tuple);
 837                 } else
 838                         ret = -1;
 839         }
 840
 841         nf_ct_expect_put(exp);
 842
 843         return ret;
 844 }
 845
 846 static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
 847                          enum ip_conntrack_info ctinfo,
 848                          unsigned int protoff,
 849                          unsigned char **data, int dataoff,
 850                          Setup_UUIE *setup)
 851 {
 852         int dir = CTINFO2DIR(ctinfo);
 853         int ret;
 854         int i;
 855         __be16 port;
 856         union nf_inet_addr addr;
 857         typeof(set_h225_addr_hook) set_h225_addr;
 858
 859         pr_debug("nf_ct_q931: Setup\n");
 860
 861         if (setup->options & eSetup_UUIE_h245Address) {
 862                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
 863                                   &setup->h245Address);
 864                 if (ret < 0)
 865                         return -1;
 866         }
 867
 868         set_h225_addr = rcu_dereference(set_h225_addr_hook);
 869         if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
 870             (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
 871             ct->status & IPS_NAT_MASK &&
 872             get_h225_addr(ct, *data, &setup->destCallSignalAddress,
 873                           &addr, &port) &&
 874             memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
 875                 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
 876                          &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
 877                          ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
 878                 ret = set_h225_addr(skb, protoff, data, dataoff,
 879                                     &setup->destCallSignalAddress,
 880                                     &ct->tuplehash[!dir].tuple.src.u3,
 881                                     ct->tuplehash[!dir].tuple.src.u.tcp.port);
 882                 if (ret < 0)
 883                         return -1;
 884         }
 885
 886         if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
 887             (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
 888             ct->status & IPS_NAT_MASK &&
 889             get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
 890                           &addr, &port) &&
 891             memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
 892                 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
 893                          &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
 894                          ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
 895                 ret = set_h225_addr(skb, protoff, data, dataoff,
 896                                     &setup->sourceCallSignalAddress,
 897                                     &ct->tuplehash[!dir].tuple.dst.u3,
 898                                     ct->tuplehash[!dir].tuple.dst.u.tcp.port);
 899                 if (ret < 0)
 900                         return -1;
 901         }
 902
 903         if (setup->options & eSetup_UUIE_fastStart) {
 904                 for (i = 0; i < setup->fastStart.count; i++) {
 905                         ret = process_olc(skb, ct, ctinfo,
 906                                           protoff, data, dataoff,
 907                                           &setup->fastStart.item[i]);
 908                         if (ret < 0)
 909                                 return -1;
 910                 }
 911         }
 912
 913         return 0;
 914 }
 915
 916 static int process_callproceeding(struct sk_buff *skb,
 917                                   struct nf_conn *ct,
 918                                   enum ip_conntrack_info ctinfo,
 919                                   unsigned int protoff,
 920                                   unsigned char **data, int dataoff,
 921                                   CallProceeding_UUIE *callproc)
 922 {
 923         int ret;
 924         int i;
 925
 926         pr_debug("nf_ct_q931: CallProceeding\n");
 927
 928         if (callproc->options & eCallProceeding_UUIE_h245Address) {
 929                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
 930                                   &callproc->h245Address);
 931                 if (ret < 0)
 932                         return -1;
 933         }
 934
 935         if (callproc->options & eCallProceeding_UUIE_fastStart) {
 936                 for (i = 0; i < callproc->fastStart.count; i++) {
 937                         ret = process_olc(skb, ct, ctinfo,
 938                                           protoff, data, dataoff,
 939                                           &callproc->fastStart.item[i]);
 940                         if (ret < 0)
 941                                 return -1;
 942                 }
 943         }
 944
 945         return 0;
 946 }
 947
 948 static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
 949                            enum ip_conntrack_info ctinfo,
 950                            unsigned int protoff,
 951                            unsigned char **data, int dataoff,
 952                            Connect_UUIE *connect)
 953 {
 954         int ret;
 955         int i;
 956
 957         pr_debug("nf_ct_q931: Connect\n");
 958
 959         if (connect->options & eConnect_UUIE_h245Address) {
 960                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
 961                                   &connect->h245Address);
 962                 if (ret < 0)
 963                         return -1;
 964         }
 965
 966         if (connect->options & eConnect_UUIE_fastStart) {
 967                 for (i = 0; i < connect->fastStart.count; i++) {
 968                         ret = process_olc(skb, ct, ctinfo,
 969                                           protoff, data, dataoff,
 970                                           &connect->fastStart.item[i]);
 971                         if (ret < 0)
 972                                 return -1;
 973                 }
 974         }
 975
 976         return 0;
 977 }
 978
 979 static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
 980                             enum ip_conntrack_info ctinfo,
 981                             unsigned int protoff,
 982                             unsigned char **data, int dataoff,
 983                             Alerting_UUIE *alert)
 984 {
 985         int ret;
 986         int i;
 987
 988         pr_debug("nf_ct_q931: Alerting\n");
 989
 990         if (alert->options & eAlerting_UUIE_h245Address) {
 991                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
 992                                   &alert->h245Address);
 993                 if (ret < 0)
 994                         return -1;
 995         }
 996
 997         if (alert->options & eAlerting_UUIE_fastStart) {
 998                 for (i = 0; i < alert->fastStart.count; i++) {
 999                         ret = process_olc(skb, ct, ctinfo,
1000                                           protoff, data, dataoff,
1001                                           &alert->fastStart.item[i]);
1002                         if (ret < 0)
1003                                 return -1;
1004                 }
1005         }
1006
1007         return 0;
1008 }
1009
1010 static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
1011                             enum ip_conntrack_info ctinfo,
1012                             unsigned int protoff,
1013                             unsigned char **data, int dataoff,
1014                             Facility_UUIE *facility)
1015 {
1016         int ret;
1017         int i;
1018
1019         pr_debug("nf_ct_q931: Facility\n");
1020
1021         if (facility->reason.choice == eFacilityReason_callForwarded) {
1022                 if (facility->options & eFacility_UUIE_alternativeAddress)
1023                         return expect_callforwarding(skb, ct, ctinfo,
1024                                                      protoff, data, dataoff,
1025                                                      &facility->
1026                                                      alternativeAddress);
1027                 return 0;
1028         }
1029
1030         if (facility->options & eFacility_UUIE_h245Address) {
1031                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1032                                   &facility->h245Address);
1033                 if (ret < 0)
1034                         return -1;
1035         }
1036
1037         if (facility->options & eFacility_UUIE_fastStart) {
1038                 for (i = 0; i < facility->fastStart.count; i++) {
1039                         ret = process_olc(skb, ct, ctinfo,
1040                                           protoff, data, dataoff,
1041                                           &facility->fastStart.item[i]);
1042                         if (ret < 0)
1043                                 return -1;
1044                 }
1045         }
1046
1047         return 0;
1048 }
1049
1050 static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
1051                             enum ip_conntrack_info ctinfo,
1052                             unsigned int protoff,
1053                             unsigned char **data, int dataoff,
1054                             Progress_UUIE *progress)
1055 {
1056         int ret;
1057         int i;
1058
1059         pr_debug("nf_ct_q931: Progress\n");
1060
1061         if (progress->options & eProgress_UUIE_h245Address) {
1062                 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff,
1063                                   &progress->h245Address);
1064                 if (ret < 0)
1065                         return -1;
1066         }
1067
1068         if (progress->options & eProgress_UUIE_fastStart) {
1069                 for (i = 0; i < progress->fastStart.count; i++) {
1070                         ret = process_olc(skb, ct, ctinfo,
1071                                           protoff, data, dataoff,
1072                                           &progress->fastStart.item[i]);
1073                         if (ret < 0)
1074                                 return -1;
1075                 }
1076         }
1077
1078         return 0;
1079 }
1080
1081 static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
1082                         enum ip_conntrack_info ctinfo,
1083                         unsigned int protoff, unsigned char **data, int dataoff,
1084                         Q931 *q931)
1085 {
1086         H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1087         int i;
1088         int ret = 0;
1089
1090         switch (pdu->h323_message_body.choice) {
1091         case eH323_UU_PDU_h323_message_body_setup:
1092                 ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff,
1093                                     &pdu->h323_message_body.setup);
1094                 break;
1095         case eH323_UU_PDU_h323_message_body_callProceeding:
1096                 ret = process_callproceeding(skb, ct, ctinfo,
1097                                              protoff, data, dataoff,
1098                                              &pdu->h323_message_body.
1099                                              callProceeding);
1100                 break;
1101         case eH323_UU_PDU_h323_message_body_connect:
1102                 ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff,
1103                                       &pdu->h323_message_body.connect);
1104                 break;
1105         case eH323_UU_PDU_h323_message_body_alerting:
1106                 ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff,
1107                                        &pdu->h323_message_body.alerting);
1108                 break;
1109         case eH323_UU_PDU_h323_message_body_facility:
1110                 ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff,
1111                                        &pdu->h323_message_body.facility);
1112                 break;
1113         case eH323_UU_PDU_h323_message_body_progress:
1114                 ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff,
1115                                        &pdu->h323_message_body.progress);
1116                 break;
1117         default:
1118                 pr_debug("nf_ct_q931: Q.931 signal %d\n",
1119                          pdu->h323_message_body.choice);
1120                 break;
1121         }
1122
1123         if (ret < 0)
1124                 return -1;
1125
1126         if (pdu->options & eH323_UU_PDU_h245Control) {
1127                 for (i = 0; i < pdu->h245Control.count; i++) {
1128                         ret = process_h245(skb, ct, ctinfo,
1129                                            protoff, data, dataoff,
1130                                            &pdu->h245Control.item[i]);
1131                         if (ret < 0)
1132                                 return -1;
1133                 }
1134         }
1135
1136         return 0;
1137 }
1138
1139 static int q931_help(struct sk_buff *skb, unsigned int protoff,
1140                      struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1141 {
1142         static Q931 q931;
1143         unsigned char *data = NULL;
1144         int datalen;
1145         int dataoff;
1146         int ret;
1147
1148         /* Until there's been traffic both ways, don't look in packets. */
1149         if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
1150                 return NF_ACCEPT;
1151
1152         pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
1153
1154         spin_lock_bh(&nf_h323_lock);
1155
1156         /* Process each TPKT */
1157         while (get_tpkt_data(skb, protoff, ct, ctinfo,
1158                              &data, &datalen, &dataoff)) {
1159                 pr_debug("nf_ct_q931: TPKT len=%d ", datalen);
1160                 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1161
1162                 /* Decode Q.931 signal */
1163                 ret = DecodeQ931(data, datalen, &q931);
1164                 if (ret < 0) {
1165                         pr_debug("nf_ct_q931: decoding error: %s\n",
1166                                  ret == H323_ERROR_BOUND ?
1167                                  "out of bound" : "out of range");
1168                         /* We don't drop when decoding error */
1169                         break;
1170                 }
1171
1172                 /* Process Q.931 signal */
1173                 if (process_q931(skb, ct, ctinfo, protoff,
1174                                  &data, dataoff, &q931) < 0)
1175                         goto drop;
1176         }
1177
1178         spin_unlock_bh(&nf_h323_lock);
1179         return NF_ACCEPT;
1180
1181       drop:
1182         spin_unlock_bh(&nf_h323_lock);
1183         nf_ct_helper_log(skb, ct, "cannot process Q.931 message");
1184         return NF_DROP;
1185 }
1186
1187 static const struct nf_conntrack_expect_policy q931_exp_policy = {
1188         /* T.120 and H.245 */
1189         .max_expected           = H323_RTP_CHANNEL_MAX * 4 + 4,
1190         .timeout                = 240,
1191 };
1192
1193 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1194         {
1195                 .name                   = "Q.931",
1196                 .me                     = THIS_MODULE,
1197                 .tuple.src.l3num        = AF_INET,
1198                 .tuple.src.u.tcp.port   = cpu_to_be16(Q931_PORT),
1199                 .tuple.dst.protonum     = IPPROTO_TCP,
1200                 .help                   = q931_help,
1201                 .expect_policy          = &q931_exp_policy,
1202         },
1203         {
1204                 .name                   = "Q.931",
1205                 .me                     = THIS_MODULE,
1206                 .tuple.src.l3num        = AF_INET6,
1207                 .tuple.src.u.tcp.port   = cpu_to_be16(Q931_PORT),
1208                 .tuple.dst.protonum     = IPPROTO_TCP,
1209                 .help                   = q931_help,
1210                 .expect_policy          = &q931_exp_policy,
1211         },
1212 };
1213
1214 static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
1215                                    int *datalen)
1216 {
1217         const struct udphdr *uh;
1218         struct udphdr _uh;
1219         int dataoff;
1220
1221         uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
1222         if (uh == NULL)
1223                 return NULL;
1224         dataoff = protoff + sizeof(_uh);
1225         if (dataoff >= skb->len)
1226                 return NULL;
1227         *datalen = skb->len - dataoff;
1228         return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
1229 }
1230
1231 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1232                                                union nf_inet_addr *addr,
1233                                                __be16 port)
1234 {
1235         struct net *net = nf_ct_net(ct);
1236         struct nf_conntrack_expect *exp;
1237         struct nf_conntrack_tuple tuple;
1238
1239         memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1240         tuple.src.u.tcp.port = 0;
1241         memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1242         tuple.dst.u.tcp.port = port;
1243         tuple.dst.protonum = IPPROTO_TCP;
1244
1245         exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
1246         if (exp && exp->master == ct)
1247                 return exp;
1248         return NULL;
1249 }
1250
1251 static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
1252                        enum ip_conntrack_info ctinfo,
1253                        unsigned int protoff, unsigned char **data,
1254                        TransportAddress *taddr, int count)
1255 {
1256         struct nf_ct_h323_master *info = nfct_help_data(ct);
1257         int dir = CTINFO2DIR(ctinfo);
1258         int ret = 0;
1259         int i;
1260         __be16 port;
1261         union nf_inet_addr addr;
1262         struct nf_conntrack_expect *exp;
1263         typeof(nat_q931_hook) nat_q931;
1264
1265         /* Look for the first related address */
1266         for (i = 0; i < count; i++) {
1267                 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1268                     memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1269                            sizeof(addr)) == 0 && port != 0)
1270                         break;
1271         }
1272
1273         if (i >= count)         /* Not found */
1274                 return 0;
1275
1276         /* Create expect for Q.931 */
1277         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1278                 return -1;
1279         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1280                           gkrouted_only ? /* only accept calls from GK? */
1281                                 &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1282                           &ct->tuplehash[!dir].tuple.dst.u3,
1283                           IPPROTO_TCP, NULL, &port);
1284         exp->helper = nf_conntrack_helper_q931;
1285         exp->flags = NF_CT_EXPECT_PERMANENT;    /* Accept multiple calls */
1286
1287         nat_q931 = rcu_dereference(nat_q931_hook);
1288         if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1289             ct->status & IPS_NAT_MASK) {        /* Need NAT */
1290                 ret = nat_q931(skb, ct, ctinfo, protoff, data,
1291                                taddr, i, port, exp);
1292         } else {                /* Conntrack only */
1293                 if (nf_ct_expect_related(exp) == 0) {
1294                         pr_debug("nf_ct_ras: expect Q.931 ");
1295                         nf_ct_dump_tuple(&exp->tuple);
1296
1297                         /* Save port for looking up expect in processing RCF */
1298                         info->sig_port[dir] = port;
1299                 } else
1300                         ret = -1;
1301         }
1302
1303         nf_ct_expect_put(exp);
1304
1305         return ret;
1306 }
1307
1308 static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
1309                        enum ip_conntrack_info ctinfo,
1310                        unsigned int protoff,
1311                        unsigned char **data, GatekeeperRequest *grq)
1312 {
1313         typeof(set_ras_addr_hook) set_ras_addr;
1314
1315         pr_debug("nf_ct_ras: GRQ\n");
1316
1317         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1318         if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1319             ct->status & IPS_NAT_MASK)  /* NATed */
1320                 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1321                                     &grq->rasAddress, 1);
1322         return 0;
1323 }
1324
1325 static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
1326                        enum ip_conntrack_info ctinfo,
1327                        unsigned int protoff,
1328                        unsigned char **data, GatekeeperConfirm *gcf)
1329 {
1330         int dir = CTINFO2DIR(ctinfo);
1331         int ret = 0;
1332         __be16 port;
1333         union nf_inet_addr addr;
1334         struct nf_conntrack_expect *exp;
1335
1336         pr_debug("nf_ct_ras: GCF\n");
1337
1338         if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1339                 return 0;
1340
1341         /* Registration port is the same as discovery port */
1342         if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1343             port == ct->tuplehash[dir].tuple.src.u.udp.port)
1344                 return 0;
1345
1346         /* Avoid RAS expectation loops. A GCF is never expected. */
1347         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1348                 return 0;
1349
1350         /* Need new expect */
1351         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1352                 return -1;
1353         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1354                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1355                           IPPROTO_UDP, NULL, &port);
1356         exp->helper = nf_conntrack_helper_ras;
1357
1358         if (nf_ct_expect_related(exp) == 0) {
1359                 pr_debug("nf_ct_ras: expect RAS ");
1360                 nf_ct_dump_tuple(&exp->tuple);
1361         } else
1362                 ret = -1;
1363
1364         nf_ct_expect_put(exp);
1365
1366         return ret;
1367 }
1368
1369 static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
1370                        enum ip_conntrack_info ctinfo,
1371                        unsigned int protoff,
1372                        unsigned char **data, RegistrationRequest *rrq)
1373 {
1374         struct nf_ct_h323_master *info = nfct_help_data(ct);
1375         int ret;
1376         typeof(set_ras_addr_hook) set_ras_addr;
1377
1378         pr_debug("nf_ct_ras: RRQ\n");
1379
1380         ret = expect_q931(skb, ct, ctinfo, protoff, data,
1381                           rrq->callSignalAddress.item,
1382                           rrq->callSignalAddress.count);
1383         if (ret < 0)
1384                 return -1;
1385
1386         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1387         if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1388             ct->status & IPS_NAT_MASK) {
1389                 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1390                                    rrq->rasAddress.item,
1391                                    rrq->rasAddress.count);
1392                 if (ret < 0)
1393                         return -1;
1394         }
1395
1396         if (rrq->options & eRegistrationRequest_timeToLive) {
1397                 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1398                 info->timeout = rrq->timeToLive;
1399         } else
1400                 info->timeout = default_rrq_ttl;
1401
1402         return 0;
1403 }
1404
1405 static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
1406                        enum ip_conntrack_info ctinfo,
1407                        unsigned int protoff,
1408                        unsigned char **data, RegistrationConfirm *rcf)
1409 {
1410         struct nf_ct_h323_master *info = nfct_help_data(ct);
1411         int dir = CTINFO2DIR(ctinfo);
1412         int ret;
1413         struct nf_conntrack_expect *exp;
1414         typeof(set_sig_addr_hook) set_sig_addr;
1415
1416         pr_debug("nf_ct_ras: RCF\n");
1417
1418         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1419         if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1420             ct->status & IPS_NAT_MASK) {
1421                 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1422                                         rcf->callSignalAddress.item,
1423                                         rcf->callSignalAddress.count);
1424                 if (ret < 0)
1425                         return -1;
1426         }
1427
1428         if (rcf->options & eRegistrationConfirm_timeToLive) {
1429                 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1430                 info->timeout = rcf->timeToLive;
1431         }
1432
1433         if (info->timeout > 0) {
1434                 pr_debug("nf_ct_ras: set RAS connection timeout to "
1435                          "%u seconds\n", info->timeout);
1436                 nf_ct_refresh(ct, skb, info->timeout * HZ);
1437
1438                 /* Set expect timeout */
1439                 spin_lock_bh(&nf_conntrack_expect_lock);
1440                 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1441                                   info->sig_port[!dir]);
1442                 if (exp) {
1443                         pr_debug("nf_ct_ras: set Q.931 expect "
1444                                  "timeout to %u seconds for",
1445                                  info->timeout);
1446                         nf_ct_dump_tuple(&exp->tuple);
1447                         mod_timer_pending(&exp->timeout,
1448                                           jiffies + info->timeout * HZ);
1449                 }
1450                 spin_unlock_bh(&nf_conntrack_expect_lock);
1451         }
1452
1453         return 0;
1454 }
1455
1456 static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
1457                        enum ip_conntrack_info ctinfo,
1458                        unsigned int protoff,
1459                        unsigned char **data, UnregistrationRequest *urq)
1460 {
1461         struct nf_ct_h323_master *info = nfct_help_data(ct);
1462         int dir = CTINFO2DIR(ctinfo);
1463         int ret;
1464         typeof(set_sig_addr_hook) set_sig_addr;
1465
1466         pr_debug("nf_ct_ras: URQ\n");
1467
1468         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1469         if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1470             ct->status & IPS_NAT_MASK) {
1471                 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1472                                    urq->callSignalAddress.item,
1473                                    urq->callSignalAddress.count);
1474                 if (ret < 0)
1475                         return -1;
1476         }
1477
1478         /* Clear old expect */
1479         nf_ct_remove_expectations(ct);
1480         info->sig_port[dir] = 0;
1481         info->sig_port[!dir] = 0;
1482
1483         /* Give it 30 seconds for UCF or URJ */
1484         nf_ct_refresh(ct, skb, 30 * HZ);
1485
1486         return 0;
1487 }
1488
1489 static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
1490                        enum ip_conntrack_info ctinfo,
1491                        unsigned int protoff,
1492                        unsigned char **data, AdmissionRequest *arq)
1493 {
1494         const struct nf_ct_h323_master *info = nfct_help_data(ct);
1495         int dir = CTINFO2DIR(ctinfo);
1496         __be16 port;
1497         union nf_inet_addr addr;
1498         typeof(set_h225_addr_hook) set_h225_addr;
1499
1500         pr_debug("nf_ct_ras: ARQ\n");
1501
1502         set_h225_addr = rcu_dereference(set_h225_addr_hook);
1503         if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1504             get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1505                           &addr, &port) &&
1506             !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1507             port == info->sig_port[dir] &&
1508             nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1509             set_h225_addr && ct->status & IPS_NAT_MASK) {
1510                 /* Answering ARQ */
1511                 return set_h225_addr(skb, protoff, data, 0,
1512                                      &arq->destCallSignalAddress,
1513                                      &ct->tuplehash[!dir].tuple.dst.u3,
1514                                      info->sig_port[!dir]);
1515         }
1516
1517         if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1518             get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1519                           &addr, &port) &&
1520             !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1521             set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1522             ct->status & IPS_NAT_MASK) {
1523                 /* Calling ARQ */
1524                 return set_h225_addr(skb, protoff, data, 0,
1525                                      &arq->srcCallSignalAddress,
1526                                      &ct->tuplehash[!dir].tuple.dst.u3,
1527                                      port);
1528         }
1529
1530         return 0;
1531 }
1532
1533 static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
1534                        enum ip_conntrack_info ctinfo,
1535                        unsigned int protoff,
1536                        unsigned char **data, AdmissionConfirm *acf)
1537 {
1538         int dir = CTINFO2DIR(ctinfo);
1539         int ret = 0;
1540         __be16 port;
1541         union nf_inet_addr addr;
1542         struct nf_conntrack_expect *exp;
1543         typeof(set_sig_addr_hook) set_sig_addr;
1544
1545         pr_debug("nf_ct_ras: ACF\n");
1546
1547         if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1548                            &addr, &port))
1549                 return 0;
1550
1551         if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1552                 /* Answering ACF */
1553                 set_sig_addr = rcu_dereference(set_sig_addr_hook);
1554                 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1555                     ct->status & IPS_NAT_MASK)
1556                         return set_sig_addr(skb, ct, ctinfo, protoff, data,
1557                                             &acf->destCallSignalAddress, 1);
1558                 return 0;
1559         }
1560
1561         /* Need new expect */
1562         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1563                 return -1;
1564         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1565                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1566                           IPPROTO_TCP, NULL, &port);
1567         exp->flags = NF_CT_EXPECT_PERMANENT;
1568         exp->helper = nf_conntrack_helper_q931;
1569
1570         if (nf_ct_expect_related(exp) == 0) {
1571                 pr_debug("nf_ct_ras: expect Q.931 ");
1572                 nf_ct_dump_tuple(&exp->tuple);
1573         } else
1574                 ret = -1;
1575
1576         nf_ct_expect_put(exp);
1577
1578         return ret;
1579 }
1580
1581 static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
1582                        enum ip_conntrack_info ctinfo,
1583                        unsigned int protoff,
1584                        unsigned char **data, LocationRequest *lrq)
1585 {
1586         typeof(set_ras_addr_hook) set_ras_addr;
1587
1588         pr_debug("nf_ct_ras: LRQ\n");
1589
1590         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1591         if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1592             ct->status & IPS_NAT_MASK)
1593                 return set_ras_addr(skb, ct, ctinfo, protoff, data,
1594                                     &lrq->replyAddress, 1);
1595         return 0;
1596 }
1597
1598 static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
1599                        enum ip_conntrack_info ctinfo,
1600                        unsigned int protoff,
1601                        unsigned char **data, LocationConfirm *lcf)
1602 {
1603         int dir = CTINFO2DIR(ctinfo);
1604         int ret = 0;
1605         __be16 port;
1606         union nf_inet_addr addr;
1607         struct nf_conntrack_expect *exp;
1608
1609         pr_debug("nf_ct_ras: LCF\n");
1610
1611         if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1612                            &addr, &port))
1613                 return 0;
1614
1615         /* Need new expect for call signal */
1616         if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1617                 return -1;
1618         nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1619                           &ct->tuplehash[!dir].tuple.src.u3, &addr,
1620                           IPPROTO_TCP, NULL, &port);
1621         exp->flags = NF_CT_EXPECT_PERMANENT;
1622         exp->helper = nf_conntrack_helper_q931;
1623
1624         if (nf_ct_expect_related(exp) == 0) {
1625                 pr_debug("nf_ct_ras: expect Q.931 ");
1626                 nf_ct_dump_tuple(&exp->tuple);
1627         } else
1628                 ret = -1;
1629
1630         nf_ct_expect_put(exp);
1631
1632         /* Ignore rasAddress */
1633
1634         return ret;
1635 }
1636
1637 static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
1638                        enum ip_conntrack_info ctinfo,
1639                        unsigned int protoff,
1640                        unsigned char **data, InfoRequestResponse *irr)
1641 {
1642         int ret;
1643         typeof(set_ras_addr_hook) set_ras_addr;
1644         typeof(set_sig_addr_hook) set_sig_addr;
1645
1646         pr_debug("nf_ct_ras: IRR\n");
1647
1648         set_ras_addr = rcu_dereference(set_ras_addr_hook);
1649         if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1650             ct->status & IPS_NAT_MASK) {
1651                 ret = set_ras_addr(skb, ct, ctinfo, protoff, data,
1652                                    &irr->rasAddress, 1);
1653                 if (ret < 0)
1654                         return -1;
1655         }
1656
1657         set_sig_addr = rcu_dereference(set_sig_addr_hook);
1658         if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
1659             ct->status & IPS_NAT_MASK) {
1660                 ret = set_sig_addr(skb, ct, ctinfo, protoff, data,
1661                                         irr->callSignalAddress.item,
1662                                         irr->callSignalAddress.count);
1663                 if (ret < 0)
1664                         return -1;
1665         }
1666
1667         return 0;
1668 }
1669
1670 static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
1671                        enum ip_conntrack_info ctinfo,
1672                        unsigned int protoff,
1673                        unsigned char **data, RasMessage *ras)
1674 {
1675         switch (ras->choice) {
1676         case eRasMessage_gatekeeperRequest:
1677                 return process_grq(skb, ct, ctinfo, protoff, data,
1678                                    &ras->gatekeeperRequest);
1679         case eRasMessage_gatekeeperConfirm:
1680                 return process_gcf(skb, ct, ctinfo, protoff, data,
1681                                    &ras->gatekeeperConfirm);
1682         case eRasMessage_registrationRequest:
1683                 return process_rrq(skb, ct, ctinfo, protoff, data,
1684                                    &ras->registrationRequest);
1685         case eRasMessage_registrationConfirm:
1686                 return process_rcf(skb, ct, ctinfo, protoff, data,
1687                                    &ras->registrationConfirm);
1688         case eRasMessage_unregistrationRequest:
1689                 return process_urq(skb, ct, ctinfo, protoff, data,
1690                                    &ras->unregistrationRequest);
1691         case eRasMessage_admissionRequest:
1692                 return process_arq(skb, ct, ctinfo, protoff, data,
1693                                    &ras->admissionRequest);
1694         case eRasMessage_admissionConfirm:
1695                 return process_acf(skb, ct, ctinfo, protoff, data,
1696                                    &ras->admissionConfirm);
1697         case eRasMessage_locationRequest:
1698                 return process_lrq(skb, ct, ctinfo, protoff, data,
1699                                    &ras->locationRequest);
1700         case eRasMessage_locationConfirm:
1701                 return process_lcf(skb, ct, ctinfo, protoff, data,
1702                                    &ras->locationConfirm);
1703         case eRasMessage_infoRequestResponse:
1704                 return process_irr(skb, ct, ctinfo, protoff, data,
1705                                    &ras->infoRequestResponse);
1706         default:
1707                 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
1708                 break;
1709         }
1710
1711         return 0;
1712 }
1713
1714 static int ras_help(struct sk_buff *skb, unsigned int protoff,
1715                     struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1716 {
1717         static RasMessage ras;
1718         unsigned char *data;
1719         int datalen = 0;
1720         int ret;
1721
1722         pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
1723
1724         spin_lock_bh(&nf_h323_lock);
1725
1726         /* Get UDP data */
1727         data = get_udp_data(skb, protoff, &datalen);
1728         if (data == NULL)
1729                 goto accept;
1730         pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
1731         nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1732
1733         /* Decode RAS message */
1734         ret = DecodeRasMessage(data, datalen, &ras);
1735         if (ret < 0) {
1736                 pr_debug("nf_ct_ras: decoding error: %s\n",
1737                          ret == H323_ERROR_BOUND ?
1738                          "out of bound" : "out of range");
1739                 goto accept;
1740         }
1741
1742         /* Process RAS message */
1743         if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0)
1744                 goto drop;
1745
1746       accept:
1747         spin_unlock_bh(&nf_h323_lock);
1748         return NF_ACCEPT;
1749
1750       drop:
1751         spin_unlock_bh(&nf_h323_lock);
1752         nf_ct_helper_log(skb, ct, "cannot process RAS message");
1753         return NF_DROP;
1754 }
1755
1756 static const struct nf_conntrack_expect_policy ras_exp_policy = {
1757         .max_expected           = 32,
1758         .timeout                = 240,
1759 };
1760
1761 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1762         {
1763                 .name                   = "RAS",
1764                 .me                     = THIS_MODULE,
1765                 .tuple.src.l3num        = AF_INET,
1766                 .tuple.src.u.udp.port   = cpu_to_be16(RAS_PORT),
1767                 .tuple.dst.protonum     = IPPROTO_UDP,
1768                 .help                   = ras_help,
1769                 .expect_policy          = &ras_exp_policy,
1770         },
1771         {
1772                 .name                   = "RAS",
1773                 .me                     = THIS_MODULE,
1774                 .tuple.src.l3num        = AF_INET6,
1775                 .tuple.src.u.udp.port   = cpu_to_be16(RAS_PORT),
1776                 .tuple.dst.protonum     = IPPROTO_UDP,
1777                 .help                   = ras_help,
1778                 .expect_policy          = &ras_exp_policy,
1779         },
1780 };
1781
1782 static int __init h323_helper_init(void)
1783 {
1784         int ret;
1785
1786         ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
1787         if (ret < 0)
1788                 return ret;
1789         ret = nf_conntrack_helpers_register(nf_conntrack_helper_q931,
1790                                         ARRAY_SIZE(nf_conntrack_helper_q931));
1791         if (ret < 0)
1792                 goto err1;
1793         ret = nf_conntrack_helpers_register(nf_conntrack_helper_ras,
1794                                         ARRAY_SIZE(nf_conntrack_helper_ras));
1795         if (ret < 0)
1796                 goto err2;
1797
1798         return 0;
1799 err2:
1800         nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1801                                         ARRAY_SIZE(nf_conntrack_helper_q931));
1802 err1:
1803         nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1804         return ret;
1805 }
1806
1807 static void __exit h323_helper_exit(void)
1808 {
1809         nf_conntrack_helpers_unregister(nf_conntrack_helper_ras,
1810                                         ARRAY_SIZE(nf_conntrack_helper_ras));
1811         nf_conntrack_helpers_unregister(nf_conntrack_helper_q931,
1812                                         ARRAY_SIZE(nf_conntrack_helper_q931));
1813         nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1814 }
1815
1816 static void __exit nf_conntrack_h323_fini(void)
1817 {
1818         h323_helper_exit();
1819         kfree(h323_buffer);
1820         pr_debug("nf_ct_h323: fini\n");
1821 }
1822
1823 static int __init nf_conntrack_h323_init(void)
1824 {
1825         int ret;
1826
1827         NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master));
1828
1829         h323_buffer = kmalloc(65536, GFP_KERNEL);
1830         if (!h323_buffer)
1831                 return -ENOMEM;
1832         ret = h323_helper_init();
1833         if (ret < 0)
1834                 goto err1;
1835         pr_debug("nf_ct_h323: init success\n");
1836         return 0;
1837 err1:
1838         kfree(h323_buffer);
1839         return ret;
1840 }
1841
1842 module_init(nf_conntrack_h323_init);
1843 module_exit(nf_conntrack_h323_fini);
1844
1845 EXPORT_SYMBOL_GPL(get_h225_addr);
1846 EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1847 EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1848 EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1849 EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1850 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1851 EXPORT_SYMBOL_GPL(nat_t120_hook);
1852 EXPORT_SYMBOL_GPL(nat_h245_hook);
1853 EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1854 EXPORT_SYMBOL_GPL(nat_q931_hook);
1855
1856 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1857 MODULE_DESCRIPTION("H.323 connection tracking helper");
1858 MODULE_LICENSE("GPL");
1859 MODULE_ALIAS("ip_conntrack_h323");
1860 MODULE_ALIAS_NFCT_HELPER("RAS");
1861 MODULE_ALIAS_NFCT_HELPER("Q.931");
1862 MODULE_ALIAS_NFCT_HELPER("H.245");