linux/net/netfilter/nf_conntrack_h323_main.c
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   1/*
   2 * H.323 connection tracking helper
   3 *
   4 * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net>
   5 *
   6 * This source code is licensed under General Public License version 2.
   7 *
   8 * Based on the 'brute force' H.323 connection tracking module by
   9 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
  10 *
  11 * For more information, please see http://nath323.sourceforge.net/
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/moduleparam.h>
  16#include <linux/ctype.h>
  17#include <linux/inet.h>
  18#include <linux/in.h>
  19#include <linux/ip.h>
  20#include <linux/slab.h>
  21#include <linux/udp.h>
  22#include <linux/tcp.h>
  23#include <linux/skbuff.h>
  24#include <net/route.h>
  25#include <net/ip6_route.h>
  26
  27#include <net/netfilter/nf_conntrack.h>
  28#include <net/netfilter/nf_conntrack_core.h>
  29#include <net/netfilter/nf_conntrack_tuple.h>
  30#include <net/netfilter/nf_conntrack_expect.h>
  31#include <net/netfilter/nf_conntrack_ecache.h>
  32#include <net/netfilter/nf_conntrack_helper.h>
  33#include <net/netfilter/nf_conntrack_zones.h>
  34#include <linux/netfilter/nf_conntrack_h323.h>
  35
  36/* Parameters */
  37static unsigned int default_rrq_ttl __read_mostly = 300;
  38module_param(default_rrq_ttl, uint, 0600);
  39MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ");
  40
  41static int gkrouted_only __read_mostly = 1;
  42module_param(gkrouted_only, int, 0600);
  43MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper");
  44
  45static bool callforward_filter __read_mostly = true;
  46module_param(callforward_filter, bool, 0600);
  47MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations "
  48                                     "if both endpoints are on different sides "
  49                                     "(determined by routing information)");
  50
  51/* Hooks for NAT */
  52int (*set_h245_addr_hook) (struct sk_buff *skb,
  53                           unsigned char **data, int dataoff,
  54                           H245_TransportAddress *taddr,
  55                           union nf_inet_addr *addr, __be16 port)
  56                           __read_mostly;
  57int (*set_h225_addr_hook) (struct sk_buff *skb,
  58                           unsigned char **data, int dataoff,
  59                           TransportAddress *taddr,
  60                           union nf_inet_addr *addr, __be16 port)
  61                           __read_mostly;
  62int (*set_sig_addr_hook) (struct sk_buff *skb,
  63                          struct nf_conn *ct,
  64                          enum ip_conntrack_info ctinfo,
  65                          unsigned char **data,
  66                          TransportAddress *taddr, int count) __read_mostly;
  67int (*set_ras_addr_hook) (struct sk_buff *skb,
  68                          struct nf_conn *ct,
  69                          enum ip_conntrack_info ctinfo,
  70                          unsigned char **data,
  71                          TransportAddress *taddr, int count) __read_mostly;
  72int (*nat_rtp_rtcp_hook) (struct sk_buff *skb,
  73                          struct nf_conn *ct,
  74                          enum ip_conntrack_info ctinfo,
  75                          unsigned char **data, int dataoff,
  76                          H245_TransportAddress *taddr,
  77                          __be16 port, __be16 rtp_port,
  78                          struct nf_conntrack_expect *rtp_exp,
  79                          struct nf_conntrack_expect *rtcp_exp) __read_mostly;
  80int (*nat_t120_hook) (struct sk_buff *skb,
  81                      struct nf_conn *ct,
  82                      enum ip_conntrack_info ctinfo,
  83                      unsigned char **data, int dataoff,
  84                      H245_TransportAddress *taddr, __be16 port,
  85                      struct nf_conntrack_expect *exp) __read_mostly;
  86int (*nat_h245_hook) (struct sk_buff *skb,
  87                      struct nf_conn *ct,
  88                      enum ip_conntrack_info ctinfo,
  89                      unsigned char **data, int dataoff,
  90                      TransportAddress *taddr, __be16 port,
  91                      struct nf_conntrack_expect *exp) __read_mostly;
  92int (*nat_callforwarding_hook) (struct sk_buff *skb,
  93                                struct nf_conn *ct,
  94                                enum ip_conntrack_info ctinfo,
  95                                unsigned char **data, int dataoff,
  96                                TransportAddress *taddr, __be16 port,
  97                                struct nf_conntrack_expect *exp) __read_mostly;
  98int (*nat_q931_hook) (struct sk_buff *skb,
  99                      struct nf_conn *ct,
 100                      enum ip_conntrack_info ctinfo,
 101                      unsigned char **data, TransportAddress *taddr, int idx,
 102                      __be16 port, struct nf_conntrack_expect *exp)
 103                      __read_mostly;
 104
 105static DEFINE_SPINLOCK(nf_h323_lock);
 106static char *h323_buffer;
 107
 108static struct nf_conntrack_helper nf_conntrack_helper_h245;
 109static struct nf_conntrack_helper nf_conntrack_helper_q931[];
 110static struct nf_conntrack_helper nf_conntrack_helper_ras[];
 111
 112/****************************************************************************/
 113static int get_tpkt_data(struct sk_buff *skb, unsigned int protoff,
 114                         struct nf_conn *ct, enum ip_conntrack_info ctinfo,
 115                         unsigned char **data, int *datalen, int *dataoff)
 116{
 117        struct nf_ct_h323_master *info = nfct_help_data(ct);
 118        int dir = CTINFO2DIR(ctinfo);
 119        const struct tcphdr *th;
 120        struct tcphdr _tcph;
 121        int tcpdatalen;
 122        int tcpdataoff;
 123        unsigned char *tpkt;
 124        int tpktlen;
 125        int tpktoff;
 126
 127        /* Get TCP header */
 128        th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
 129        if (th == NULL)
 130                return 0;
 131
 132        /* Get TCP data offset */
 133        tcpdataoff = protoff + th->doff * 4;
 134
 135        /* Get TCP data length */
 136        tcpdatalen = skb->len - tcpdataoff;
 137        if (tcpdatalen <= 0)    /* No TCP data */
 138                goto clear_out;
 139
 140        if (*data == NULL) {    /* first TPKT */
 141                /* Get first TPKT pointer */
 142                tpkt = skb_header_pointer(skb, tcpdataoff, tcpdatalen,
 143                                          h323_buffer);
 144                BUG_ON(tpkt == NULL);
 145
 146                /* Validate TPKT identifier */
 147                if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) {
 148                        /* Netmeeting sends TPKT header and data separately */
 149                        if (info->tpkt_len[dir] > 0) {
 150                                pr_debug("nf_ct_h323: previous packet "
 151                                         "indicated separate TPKT data of %hu "
 152                                         "bytes\n", info->tpkt_len[dir]);
 153                                if (info->tpkt_len[dir] <= tcpdatalen) {
 154                                        /* Yes, there was a TPKT header
 155                                         * received */
 156                                        *data = tpkt;
 157                                        *datalen = info->tpkt_len[dir];
 158                                        *dataoff = 0;
 159                                        goto out;
 160                                }
 161
 162                                /* Fragmented TPKT */
 163                                pr_debug("nf_ct_h323: fragmented TPKT\n");
 164                                goto clear_out;
 165                        }
 166
 167                        /* It is not even a TPKT */
 168                        return 0;
 169                }
 170                tpktoff = 0;
 171        } else {                /* Next TPKT */
 172                tpktoff = *dataoff + *datalen;
 173                tcpdatalen -= tpktoff;
 174                if (tcpdatalen <= 4)    /* No more TPKT */
 175                        goto clear_out;
 176                tpkt = *data + *datalen;
 177
 178                /* Validate TPKT identifier */
 179                if (tpkt[0] != 0x03 || tpkt[1] != 0)
 180                        goto clear_out;
 181        }
 182
 183        /* Validate TPKT length */
 184        tpktlen = tpkt[2] * 256 + tpkt[3];
 185        if (tpktlen < 4)
 186                goto clear_out;
 187        if (tpktlen > tcpdatalen) {
 188                if (tcpdatalen == 4) {  /* Separate TPKT header */
 189                        /* Netmeeting sends TPKT header and data separately */
 190                        pr_debug("nf_ct_h323: separate TPKT header indicates "
 191                                 "there will be TPKT data of %hu bytes\n",
 192                                 tpktlen - 4);
 193                        info->tpkt_len[dir] = tpktlen - 4;
 194                        return 0;
 195                }
 196
 197                pr_debug("nf_ct_h323: incomplete TPKT (fragmented?)\n");
 198                goto clear_out;
 199        }
 200
 201        /* This is the encapsulated data */
 202        *data = tpkt + 4;
 203        *datalen = tpktlen - 4;
 204        *dataoff = tpktoff + 4;
 205
 206      out:
 207        /* Clear TPKT length */
 208        info->tpkt_len[dir] = 0;
 209        return 1;
 210
 211      clear_out:
 212        info->tpkt_len[dir] = 0;
 213        return 0;
 214}
 215
 216/****************************************************************************/
 217static int get_h245_addr(struct nf_conn *ct, const unsigned char *data,
 218                         H245_TransportAddress *taddr,
 219                         union nf_inet_addr *addr, __be16 *port)
 220{
 221        const unsigned char *p;
 222        int len;
 223
 224        if (taddr->choice != eH245_TransportAddress_unicastAddress)
 225                return 0;
 226
 227        switch (taddr->unicastAddress.choice) {
 228        case eUnicastAddress_iPAddress:
 229                if (nf_ct_l3num(ct) != AF_INET)
 230                        return 0;
 231                p = data + taddr->unicastAddress.iPAddress.network;
 232                len = 4;
 233                break;
 234        case eUnicastAddress_iP6Address:
 235                if (nf_ct_l3num(ct) != AF_INET6)
 236                        return 0;
 237                p = data + taddr->unicastAddress.iP6Address.network;
 238                len = 16;
 239                break;
 240        default:
 241                return 0;
 242        }
 243
 244        memcpy(addr, p, len);
 245        memset((void *)addr + len, 0, sizeof(*addr) - len);
 246        memcpy(port, p + len, sizeof(__be16));
 247
 248        return 1;
 249}
 250
 251/****************************************************************************/
 252static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
 253                           enum ip_conntrack_info ctinfo,
 254                           unsigned char **data, int dataoff,
 255                           H245_TransportAddress *taddr)
 256{
 257        int dir = CTINFO2DIR(ctinfo);
 258        int ret = 0;
 259        __be16 port;
 260        __be16 rtp_port, rtcp_port;
 261        union nf_inet_addr addr;
 262        struct nf_conntrack_expect *rtp_exp;
 263        struct nf_conntrack_expect *rtcp_exp;
 264        typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp;
 265
 266        /* Read RTP or RTCP address */
 267        if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
 268            memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
 269            port == 0)
 270                return 0;
 271
 272        /* RTP port is even */
 273        rtp_port = port & ~htons(1);
 274        rtcp_port = port | htons(1);
 275
 276        /* Create expect for RTP */
 277        if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
 278                return -1;
 279        nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
 280                          &ct->tuplehash[!dir].tuple.src.u3,
 281                          &ct->tuplehash[!dir].tuple.dst.u3,
 282                          IPPROTO_UDP, NULL, &rtp_port);
 283
 284        /* Create expect for RTCP */
 285        if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) {
 286                nf_ct_expect_put(rtp_exp);
 287                return -1;
 288        }
 289        nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
 290                          &ct->tuplehash[!dir].tuple.src.u3,
 291                          &ct->tuplehash[!dir].tuple.dst.u3,
 292                          IPPROTO_UDP, NULL, &rtcp_port);
 293
 294        if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 295                   &ct->tuplehash[!dir].tuple.dst.u3,
 296                   sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 297                   (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) &&
 298                   ct->status & IPS_NAT_MASK) {
 299                /* NAT needed */
 300                ret = nat_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
 301                                   taddr, port, rtp_port, rtp_exp, rtcp_exp);
 302        } else {                /* Conntrack only */
 303                if (nf_ct_expect_related(rtp_exp) == 0) {
 304                        if (nf_ct_expect_related(rtcp_exp) == 0) {
 305                                pr_debug("nf_ct_h323: expect RTP ");
 306                                nf_ct_dump_tuple(&rtp_exp->tuple);
 307                                pr_debug("nf_ct_h323: expect RTCP ");
 308                                nf_ct_dump_tuple(&rtcp_exp->tuple);
 309                        } else {
 310                                nf_ct_unexpect_related(rtp_exp);
 311                                ret = -1;
 312                        }
 313                } else
 314                        ret = -1;
 315        }
 316
 317        nf_ct_expect_put(rtp_exp);
 318        nf_ct_expect_put(rtcp_exp);
 319
 320        return ret;
 321}
 322
 323/****************************************************************************/
 324static int expect_t120(struct sk_buff *skb,
 325                       struct nf_conn *ct,
 326                       enum ip_conntrack_info ctinfo,
 327                       unsigned char **data, int dataoff,
 328                       H245_TransportAddress *taddr)
 329{
 330        int dir = CTINFO2DIR(ctinfo);
 331        int ret = 0;
 332        __be16 port;
 333        union nf_inet_addr addr;
 334        struct nf_conntrack_expect *exp;
 335        typeof(nat_t120_hook) nat_t120;
 336
 337        /* Read T.120 address */
 338        if (!get_h245_addr(ct, *data, taddr, &addr, &port) ||
 339            memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
 340            port == 0)
 341                return 0;
 342
 343        /* Create expect for T.120 connections */
 344        if ((exp = nf_ct_expect_alloc(ct)) == NULL)
 345                return -1;
 346        nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
 347                          &ct->tuplehash[!dir].tuple.src.u3,
 348                          &ct->tuplehash[!dir].tuple.dst.u3,
 349                          IPPROTO_TCP, NULL, &port);
 350        exp->flags = NF_CT_EXPECT_PERMANENT;    /* Accept multiple channels */
 351
 352        if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 353                   &ct->tuplehash[!dir].tuple.dst.u3,
 354                   sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 355            (nat_t120 = rcu_dereference(nat_t120_hook)) &&
 356            ct->status & IPS_NAT_MASK) {
 357                /* NAT needed */
 358                ret = nat_t120(skb, ct, ctinfo, data, dataoff, taddr,
 359                               port, exp);
 360        } else {                /* Conntrack only */
 361                if (nf_ct_expect_related(exp) == 0) {
 362                        pr_debug("nf_ct_h323: expect T.120 ");
 363                        nf_ct_dump_tuple(&exp->tuple);
 364                } else
 365                        ret = -1;
 366        }
 367
 368        nf_ct_expect_put(exp);
 369
 370        return ret;
 371}
 372
 373/****************************************************************************/
 374static int process_h245_channel(struct sk_buff *skb,
 375                                struct nf_conn *ct,
 376                                enum ip_conntrack_info ctinfo,
 377                                unsigned char **data, int dataoff,
 378                                H2250LogicalChannelParameters *channel)
 379{
 380        int ret;
 381
 382        if (channel->options & eH2250LogicalChannelParameters_mediaChannel) {
 383                /* RTP */
 384                ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
 385                                      &channel->mediaChannel);
 386                if (ret < 0)
 387                        return -1;
 388        }
 389
 390        if (channel->
 391            options & eH2250LogicalChannelParameters_mediaControlChannel) {
 392                /* RTCP */
 393                ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
 394                                      &channel->mediaControlChannel);
 395                if (ret < 0)
 396                        return -1;
 397        }
 398
 399        return 0;
 400}
 401
 402/****************************************************************************/
 403static int process_olc(struct sk_buff *skb, struct nf_conn *ct,
 404                       enum ip_conntrack_info ctinfo,
 405                       unsigned char **data, int dataoff,
 406                       OpenLogicalChannel *olc)
 407{
 408        int ret;
 409
 410        pr_debug("nf_ct_h323: OpenLogicalChannel\n");
 411
 412        if (olc->forwardLogicalChannelParameters.multiplexParameters.choice ==
 413            eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)
 414        {
 415                ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
 416                                           &olc->
 417                                           forwardLogicalChannelParameters.
 418                                           multiplexParameters.
 419                                           h2250LogicalChannelParameters);
 420                if (ret < 0)
 421                        return -1;
 422        }
 423
 424        if ((olc->options &
 425             eOpenLogicalChannel_reverseLogicalChannelParameters) &&
 426            (olc->reverseLogicalChannelParameters.options &
 427             eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters)
 428            && (olc->reverseLogicalChannelParameters.multiplexParameters.
 429                choice ==
 430                eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
 431        {
 432                ret =
 433                    process_h245_channel(skb, ct, ctinfo, data, dataoff,
 434                                         &olc->
 435                                         reverseLogicalChannelParameters.
 436                                         multiplexParameters.
 437                                         h2250LogicalChannelParameters);
 438                if (ret < 0)
 439                        return -1;
 440        }
 441
 442        if ((olc->options & eOpenLogicalChannel_separateStack) &&
 443            olc->forwardLogicalChannelParameters.dataType.choice ==
 444            eDataType_data &&
 445            olc->forwardLogicalChannelParameters.dataType.data.application.
 446            choice == eDataApplicationCapability_application_t120 &&
 447            olc->forwardLogicalChannelParameters.dataType.data.application.
 448            t120.choice == eDataProtocolCapability_separateLANStack &&
 449            olc->separateStack.networkAddress.choice ==
 450            eNetworkAccessParameters_networkAddress_localAreaAddress) {
 451                ret = expect_t120(skb, ct, ctinfo, data, dataoff,
 452                                  &olc->separateStack.networkAddress.
 453                                  localAreaAddress);
 454                if (ret < 0)
 455                        return -1;
 456        }
 457
 458        return 0;
 459}
 460
 461/****************************************************************************/
 462static int process_olca(struct sk_buff *skb, struct nf_conn *ct,
 463                        enum ip_conntrack_info ctinfo,
 464                        unsigned char **data, int dataoff,
 465                        OpenLogicalChannelAck *olca)
 466{
 467        H2250LogicalChannelAckParameters *ack;
 468        int ret;
 469
 470        pr_debug("nf_ct_h323: OpenLogicalChannelAck\n");
 471
 472        if ((olca->options &
 473             eOpenLogicalChannelAck_reverseLogicalChannelParameters) &&
 474            (olca->reverseLogicalChannelParameters.options &
 475             eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters)
 476            && (olca->reverseLogicalChannelParameters.multiplexParameters.
 477                choice ==
 478                eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters))
 479        {
 480                ret = process_h245_channel(skb, ct, ctinfo, data, dataoff,
 481                                           &olca->
 482                                           reverseLogicalChannelParameters.
 483                                           multiplexParameters.
 484                                           h2250LogicalChannelParameters);
 485                if (ret < 0)
 486                        return -1;
 487        }
 488
 489        if ((olca->options &
 490             eOpenLogicalChannelAck_forwardMultiplexAckParameters) &&
 491            (olca->forwardMultiplexAckParameters.choice ==
 492             eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters))
 493        {
 494                ack = &olca->forwardMultiplexAckParameters.
 495                    h2250LogicalChannelAckParameters;
 496                if (ack->options &
 497                    eH2250LogicalChannelAckParameters_mediaChannel) {
 498                        /* RTP */
 499                        ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
 500                                              &ack->mediaChannel);
 501                        if (ret < 0)
 502                                return -1;
 503                }
 504
 505                if (ack->options &
 506                    eH2250LogicalChannelAckParameters_mediaControlChannel) {
 507                        /* RTCP */
 508                        ret = expect_rtp_rtcp(skb, ct, ctinfo, data, dataoff,
 509                                              &ack->mediaControlChannel);
 510                        if (ret < 0)
 511                                return -1;
 512                }
 513        }
 514
 515        if ((olca->options & eOpenLogicalChannelAck_separateStack) &&
 516                olca->separateStack.networkAddress.choice ==
 517                eNetworkAccessParameters_networkAddress_localAreaAddress) {
 518                ret = expect_t120(skb, ct, ctinfo, data, dataoff,
 519                                  &olca->separateStack.networkAddress.
 520                                  localAreaAddress);
 521                if (ret < 0)
 522                        return -1;
 523        }
 524
 525        return 0;
 526}
 527
 528/****************************************************************************/
 529static int process_h245(struct sk_buff *skb, struct nf_conn *ct,
 530                        enum ip_conntrack_info ctinfo,
 531                        unsigned char **data, int dataoff,
 532                        MultimediaSystemControlMessage *mscm)
 533{
 534        switch (mscm->choice) {
 535        case eMultimediaSystemControlMessage_request:
 536                if (mscm->request.choice ==
 537                    eRequestMessage_openLogicalChannel) {
 538                        return process_olc(skb, ct, ctinfo, data, dataoff,
 539                                           &mscm->request.openLogicalChannel);
 540                }
 541                pr_debug("nf_ct_h323: H.245 Request %d\n",
 542                         mscm->request.choice);
 543                break;
 544        case eMultimediaSystemControlMessage_response:
 545                if (mscm->response.choice ==
 546                    eResponseMessage_openLogicalChannelAck) {
 547                        return process_olca(skb, ct, ctinfo, data, dataoff,
 548                                            &mscm->response.
 549                                            openLogicalChannelAck);
 550                }
 551                pr_debug("nf_ct_h323: H.245 Response %d\n",
 552                         mscm->response.choice);
 553                break;
 554        default:
 555                pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice);
 556                break;
 557        }
 558
 559        return 0;
 560}
 561
 562/****************************************************************************/
 563static int h245_help(struct sk_buff *skb, unsigned int protoff,
 564                     struct nf_conn *ct, enum ip_conntrack_info ctinfo)
 565{
 566        static MultimediaSystemControlMessage mscm;
 567        unsigned char *data = NULL;
 568        int datalen;
 569        int dataoff;
 570        int ret;
 571
 572        /* Until there's been traffic both ways, don't look in packets. */
 573        if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
 574                return NF_ACCEPT;
 575
 576        pr_debug("nf_ct_h245: skblen = %u\n", skb->len);
 577
 578        spin_lock_bh(&nf_h323_lock);
 579
 580        /* Process each TPKT */
 581        while (get_tpkt_data(skb, protoff, ct, ctinfo,
 582                             &data, &datalen, &dataoff)) {
 583                pr_debug("nf_ct_h245: TPKT len=%d ", datalen);
 584                nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
 585
 586                /* Decode H.245 signal */
 587                ret = DecodeMultimediaSystemControlMessage(data, datalen,
 588                                                           &mscm);
 589                if (ret < 0) {
 590                        pr_debug("nf_ct_h245: decoding error: %s\n",
 591                                 ret == H323_ERROR_BOUND ?
 592                                 "out of bound" : "out of range");
 593                        /* We don't drop when decoding error */
 594                        break;
 595                }
 596
 597                /* Process H.245 signal */
 598                if (process_h245(skb, ct, ctinfo, &data, dataoff, &mscm) < 0)
 599                        goto drop;
 600        }
 601
 602        spin_unlock_bh(&nf_h323_lock);
 603        return NF_ACCEPT;
 604
 605      drop:
 606        spin_unlock_bh(&nf_h323_lock);
 607        net_info_ratelimited("nf_ct_h245: packet dropped\n");
 608        return NF_DROP;
 609}
 610
 611/****************************************************************************/
 612static const struct nf_conntrack_expect_policy h245_exp_policy = {
 613        .max_expected   = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
 614        .timeout        = 240,
 615};
 616
 617static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
 618        .name                   = "H.245",
 619        .me                     = THIS_MODULE,
 620        .data_len               = sizeof(struct nf_ct_h323_master),
 621        .tuple.src.l3num        = AF_UNSPEC,
 622        .tuple.dst.protonum     = IPPROTO_UDP,
 623        .help                   = h245_help,
 624        .expect_policy          = &h245_exp_policy,
 625};
 626
 627/****************************************************************************/
 628int get_h225_addr(struct nf_conn *ct, unsigned char *data,
 629                  TransportAddress *taddr,
 630                  union nf_inet_addr *addr, __be16 *port)
 631{
 632        const unsigned char *p;
 633        int len;
 634
 635        switch (taddr->choice) {
 636        case eTransportAddress_ipAddress:
 637                if (nf_ct_l3num(ct) != AF_INET)
 638                        return 0;
 639                p = data + taddr->ipAddress.ip;
 640                len = 4;
 641                break;
 642        case eTransportAddress_ip6Address:
 643                if (nf_ct_l3num(ct) != AF_INET6)
 644                        return 0;
 645                p = data + taddr->ip6Address.ip;
 646                len = 16;
 647                break;
 648        default:
 649                return 0;
 650        }
 651
 652        memcpy(addr, p, len);
 653        memset((void *)addr + len, 0, sizeof(*addr) - len);
 654        memcpy(port, p + len, sizeof(__be16));
 655
 656        return 1;
 657}
 658
 659/****************************************************************************/
 660static int expect_h245(struct sk_buff *skb, struct nf_conn *ct,
 661                       enum ip_conntrack_info ctinfo,
 662                       unsigned char **data, int dataoff,
 663                       TransportAddress *taddr)
 664{
 665        int dir = CTINFO2DIR(ctinfo);
 666        int ret = 0;
 667        __be16 port;
 668        union nf_inet_addr addr;
 669        struct nf_conntrack_expect *exp;
 670        typeof(nat_h245_hook) nat_h245;
 671
 672        /* Read h245Address */
 673        if (!get_h225_addr(ct, *data, taddr, &addr, &port) ||
 674            memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) ||
 675            port == 0)
 676                return 0;
 677
 678        /* Create expect for h245 connection */
 679        if ((exp = nf_ct_expect_alloc(ct)) == NULL)
 680                return -1;
 681        nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
 682                          &ct->tuplehash[!dir].tuple.src.u3,
 683                          &ct->tuplehash[!dir].tuple.dst.u3,
 684                          IPPROTO_TCP, NULL, &port);
 685        exp->helper = &nf_conntrack_helper_h245;
 686
 687        if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 688                   &ct->tuplehash[!dir].tuple.dst.u3,
 689                   sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 690            (nat_h245 = rcu_dereference(nat_h245_hook)) &&
 691            ct->status & IPS_NAT_MASK) {
 692                /* NAT needed */
 693                ret = nat_h245(skb, ct, ctinfo, data, dataoff, taddr,
 694                               port, exp);
 695        } else {                /* Conntrack only */
 696                if (nf_ct_expect_related(exp) == 0) {
 697                        pr_debug("nf_ct_q931: expect H.245 ");
 698                        nf_ct_dump_tuple(&exp->tuple);
 699                } else
 700                        ret = -1;
 701        }
 702
 703        nf_ct_expect_put(exp);
 704
 705        return ret;
 706}
 707
 708/* If the calling party is on the same side of the forward-to party,
 709 * we don't need to track the second call */
 710static int callforward_do_filter(const union nf_inet_addr *src,
 711                                 const union nf_inet_addr *dst,
 712                                 u_int8_t family)
 713{
 714        const struct nf_afinfo *afinfo;
 715        int ret = 0;
 716
 717        /* rcu_read_lock()ed by nf_hook_slow() */
 718        afinfo = nf_get_afinfo(family);
 719        if (!afinfo)
 720                return 0;
 721
 722        switch (family) {
 723        case AF_INET: {
 724                struct flowi4 fl1, fl2;
 725                struct rtable *rt1, *rt2;
 726
 727                memset(&fl1, 0, sizeof(fl1));
 728                fl1.daddr = src->ip;
 729
 730                memset(&fl2, 0, sizeof(fl2));
 731                fl2.daddr = dst->ip;
 732                if (!afinfo->route(&init_net, (struct dst_entry **)&rt1,
 733                                   flowi4_to_flowi(&fl1), false)) {
 734                        if (!afinfo->route(&init_net, (struct dst_entry **)&rt2,
 735                                           flowi4_to_flowi(&fl2), false)) {
 736                                if (rt_nexthop(rt1, fl1.daddr) ==
 737                                    rt_nexthop(rt2, fl2.daddr) &&
 738                                    rt1->dst.dev  == rt2->dst.dev)
 739                                        ret = 1;
 740                                dst_release(&rt2->dst);
 741                        }
 742                        dst_release(&rt1->dst);
 743                }
 744                break;
 745        }
 746#if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6)
 747        case AF_INET6: {
 748                struct flowi6 fl1, fl2;
 749                struct rt6_info *rt1, *rt2;
 750
 751                memset(&fl1, 0, sizeof(fl1));
 752                fl1.daddr = src->in6;
 753
 754                memset(&fl2, 0, sizeof(fl2));
 755                fl2.daddr = dst->in6;
 756                if (!afinfo->route(&init_net, (struct dst_entry **)&rt1,
 757                                   flowi6_to_flowi(&fl1), false)) {
 758                        if (!afinfo->route(&init_net, (struct dst_entry **)&rt2,
 759                                           flowi6_to_flowi(&fl2), false)) {
 760                                if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway,
 761                                            sizeof(rt1->rt6i_gateway)) &&
 762                                    rt1->dst.dev == rt2->dst.dev)
 763                                        ret = 1;
 764                                dst_release(&rt2->dst);
 765                        }
 766                        dst_release(&rt1->dst);
 767                }
 768                break;
 769        }
 770#endif
 771        }
 772        return ret;
 773
 774}
 775
 776/****************************************************************************/
 777static int expect_callforwarding(struct sk_buff *skb,
 778                                 struct nf_conn *ct,
 779                                 enum ip_conntrack_info ctinfo,
 780                                 unsigned char **data, int dataoff,
 781                                 TransportAddress *taddr)
 782{
 783        int dir = CTINFO2DIR(ctinfo);
 784        int ret = 0;
 785        __be16 port;
 786        union nf_inet_addr addr;
 787        struct nf_conntrack_expect *exp;
 788        typeof(nat_callforwarding_hook) nat_callforwarding;
 789
 790        /* Read alternativeAddress */
 791        if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0)
 792                return 0;
 793
 794        /* If the calling party is on the same side of the forward-to party,
 795         * we don't need to track the second call */
 796        if (callforward_filter &&
 797            callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3,
 798                                  nf_ct_l3num(ct))) {
 799                pr_debug("nf_ct_q931: Call Forwarding not tracked\n");
 800                return 0;
 801        }
 802
 803        /* Create expect for the second call leg */
 804        if ((exp = nf_ct_expect_alloc(ct)) == NULL)
 805                return -1;
 806        nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
 807                          &ct->tuplehash[!dir].tuple.src.u3, &addr,
 808                          IPPROTO_TCP, NULL, &port);
 809        exp->helper = nf_conntrack_helper_q931;
 810
 811        if (memcmp(&ct->tuplehash[dir].tuple.src.u3,
 812                   &ct->tuplehash[!dir].tuple.dst.u3,
 813                   sizeof(ct->tuplehash[dir].tuple.src.u3)) &&
 814            (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) &&
 815            ct->status & IPS_NAT_MASK) {
 816                /* Need NAT */
 817                ret = nat_callforwarding(skb, ct, ctinfo, data, dataoff,
 818                                         taddr, port, exp);
 819        } else {                /* Conntrack only */
 820                if (nf_ct_expect_related(exp) == 0) {
 821                        pr_debug("nf_ct_q931: expect Call Forwarding ");
 822                        nf_ct_dump_tuple(&exp->tuple);
 823                } else
 824                        ret = -1;
 825        }
 826
 827        nf_ct_expect_put(exp);
 828
 829        return ret;
 830}
 831
 832/****************************************************************************/
 833static int process_setup(struct sk_buff *skb, struct nf_conn *ct,
 834                         enum ip_conntrack_info ctinfo,
 835                         unsigned char **data, int dataoff,
 836                         Setup_UUIE *setup)
 837{
 838        int dir = CTINFO2DIR(ctinfo);
 839        int ret;
 840        int i;
 841        __be16 port;
 842        union nf_inet_addr addr;
 843        typeof(set_h225_addr_hook) set_h225_addr;
 844
 845        pr_debug("nf_ct_q931: Setup\n");
 846
 847        if (setup->options & eSetup_UUIE_h245Address) {
 848                ret = expect_h245(skb, ct, ctinfo, data, dataoff,
 849                                  &setup->h245Address);
 850                if (ret < 0)
 851                        return -1;
 852        }
 853
 854        set_h225_addr = rcu_dereference(set_h225_addr_hook);
 855        if ((setup->options & eSetup_UUIE_destCallSignalAddress) &&
 856            (set_h225_addr) && ct->status & IPS_NAT_MASK &&
 857            get_h225_addr(ct, *data, &setup->destCallSignalAddress,
 858                          &addr, &port) &&
 859            memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) {
 860                pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n",
 861                         &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3,
 862                         ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port));
 863                ret = set_h225_addr(skb, data, dataoff,
 864                                    &setup->destCallSignalAddress,
 865                                    &ct->tuplehash[!dir].tuple.src.u3,
 866                                    ct->tuplehash[!dir].tuple.src.u.tcp.port);
 867                if (ret < 0)
 868                        return -1;
 869        }
 870
 871        if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) &&
 872            (set_h225_addr) && ct->status & IPS_NAT_MASK &&
 873            get_h225_addr(ct, *data, &setup->sourceCallSignalAddress,
 874                          &addr, &port) &&
 875            memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) {
 876                pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n",
 877                         &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3,
 878                         ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port));
 879                ret = set_h225_addr(skb, data, dataoff,
 880                                    &setup->sourceCallSignalAddress,
 881                                    &ct->tuplehash[!dir].tuple.dst.u3,
 882                                    ct->tuplehash[!dir].tuple.dst.u.tcp.port);
 883                if (ret < 0)
 884                        return -1;
 885        }
 886
 887        if (setup->options & eSetup_UUIE_fastStart) {
 888                for (i = 0; i < setup->fastStart.count; i++) {
 889                        ret = process_olc(skb, ct, ctinfo, data, dataoff,
 890                                          &setup->fastStart.item[i]);
 891                        if (ret < 0)
 892                                return -1;
 893                }
 894        }
 895
 896        return 0;
 897}
 898
 899/****************************************************************************/
 900static int process_callproceeding(struct sk_buff *skb,
 901                                  struct nf_conn *ct,
 902                                  enum ip_conntrack_info ctinfo,
 903                                  unsigned char **data, int dataoff,
 904                                  CallProceeding_UUIE *callproc)
 905{
 906        int ret;
 907        int i;
 908
 909        pr_debug("nf_ct_q931: CallProceeding\n");
 910
 911        if (callproc->options & eCallProceeding_UUIE_h245Address) {
 912                ret = expect_h245(skb, ct, ctinfo, data, dataoff,
 913                                  &callproc->h245Address);
 914                if (ret < 0)
 915                        return -1;
 916        }
 917
 918        if (callproc->options & eCallProceeding_UUIE_fastStart) {
 919                for (i = 0; i < callproc->fastStart.count; i++) {
 920                        ret = process_olc(skb, ct, ctinfo, data, dataoff,
 921                                          &callproc->fastStart.item[i]);
 922                        if (ret < 0)
 923                                return -1;
 924                }
 925        }
 926
 927        return 0;
 928}
 929
 930/****************************************************************************/
 931static int process_connect(struct sk_buff *skb, struct nf_conn *ct,
 932                           enum ip_conntrack_info ctinfo,
 933                           unsigned char **data, int dataoff,
 934                           Connect_UUIE *connect)
 935{
 936        int ret;
 937        int i;
 938
 939        pr_debug("nf_ct_q931: Connect\n");
 940
 941        if (connect->options & eConnect_UUIE_h245Address) {
 942                ret = expect_h245(skb, ct, ctinfo, data, dataoff,
 943                                  &connect->h245Address);
 944                if (ret < 0)
 945                        return -1;
 946        }
 947
 948        if (connect->options & eConnect_UUIE_fastStart) {
 949                for (i = 0; i < connect->fastStart.count; i++) {
 950                        ret = process_olc(skb, ct, ctinfo, data, dataoff,
 951                                          &connect->fastStart.item[i]);
 952                        if (ret < 0)
 953                                return -1;
 954                }
 955        }
 956
 957        return 0;
 958}
 959
 960/****************************************************************************/
 961static int process_alerting(struct sk_buff *skb, struct nf_conn *ct,
 962                            enum ip_conntrack_info ctinfo,
 963                            unsigned char **data, int dataoff,
 964                            Alerting_UUIE *alert)
 965{
 966        int ret;
 967        int i;
 968
 969        pr_debug("nf_ct_q931: Alerting\n");
 970
 971        if (alert->options & eAlerting_UUIE_h245Address) {
 972                ret = expect_h245(skb, ct, ctinfo, data, dataoff,
 973                                  &alert->h245Address);
 974                if (ret < 0)
 975                        return -1;
 976        }
 977
 978        if (alert->options & eAlerting_UUIE_fastStart) {
 979                for (i = 0; i < alert->fastStart.count; i++) {
 980                        ret = process_olc(skb, ct, ctinfo, data, dataoff,
 981                                          &alert->fastStart.item[i]);
 982                        if (ret < 0)
 983                                return -1;
 984                }
 985        }
 986
 987        return 0;
 988}
 989
 990/****************************************************************************/
 991static int process_facility(struct sk_buff *skb, struct nf_conn *ct,
 992                            enum ip_conntrack_info ctinfo,
 993                            unsigned char **data, int dataoff,
 994                            Facility_UUIE *facility)
 995{
 996        int ret;
 997        int i;
 998
 999        pr_debug("nf_ct_q931: Facility\n");
1000
1001        if (facility->reason.choice == eFacilityReason_callForwarded) {
1002                if (facility->options & eFacility_UUIE_alternativeAddress)
1003                        return expect_callforwarding(skb, ct, ctinfo, data,
1004                                                     dataoff,
1005                                                     &facility->
1006                                                     alternativeAddress);
1007                return 0;
1008        }
1009
1010        if (facility->options & eFacility_UUIE_h245Address) {
1011                ret = expect_h245(skb, ct, ctinfo, data, dataoff,
1012                                  &facility->h245Address);
1013                if (ret < 0)
1014                        return -1;
1015        }
1016
1017        if (facility->options & eFacility_UUIE_fastStart) {
1018                for (i = 0; i < facility->fastStart.count; i++) {
1019                        ret = process_olc(skb, ct, ctinfo, data, dataoff,
1020                                          &facility->fastStart.item[i]);
1021                        if (ret < 0)
1022                                return -1;
1023                }
1024        }
1025
1026        return 0;
1027}
1028
1029/****************************************************************************/
1030static int process_progress(struct sk_buff *skb, struct nf_conn *ct,
1031                            enum ip_conntrack_info ctinfo,
1032                            unsigned char **data, int dataoff,
1033                            Progress_UUIE *progress)
1034{
1035        int ret;
1036        int i;
1037
1038        pr_debug("nf_ct_q931: Progress\n");
1039
1040        if (progress->options & eProgress_UUIE_h245Address) {
1041                ret = expect_h245(skb, ct, ctinfo, data, dataoff,
1042                                  &progress->h245Address);
1043                if (ret < 0)
1044                        return -1;
1045        }
1046
1047        if (progress->options & eProgress_UUIE_fastStart) {
1048                for (i = 0; i < progress->fastStart.count; i++) {
1049                        ret = process_olc(skb, ct, ctinfo, data, dataoff,
1050                                          &progress->fastStart.item[i]);
1051                        if (ret < 0)
1052                                return -1;
1053                }
1054        }
1055
1056        return 0;
1057}
1058
1059/****************************************************************************/
1060static int process_q931(struct sk_buff *skb, struct nf_conn *ct,
1061                        enum ip_conntrack_info ctinfo,
1062                        unsigned char **data, int dataoff, Q931 *q931)
1063{
1064        H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu;
1065        int i;
1066        int ret = 0;
1067
1068        switch (pdu->h323_message_body.choice) {
1069        case eH323_UU_PDU_h323_message_body_setup:
1070                ret = process_setup(skb, ct, ctinfo, data, dataoff,
1071                                    &pdu->h323_message_body.setup);
1072                break;
1073        case eH323_UU_PDU_h323_message_body_callProceeding:
1074                ret = process_callproceeding(skb, ct, ctinfo, data, dataoff,
1075                                             &pdu->h323_message_body.
1076                                             callProceeding);
1077                break;
1078        case eH323_UU_PDU_h323_message_body_connect:
1079                ret = process_connect(skb, ct, ctinfo, data, dataoff,
1080                                      &pdu->h323_message_body.connect);
1081                break;
1082        case eH323_UU_PDU_h323_message_body_alerting:
1083                ret = process_alerting(skb, ct, ctinfo, data, dataoff,
1084                                       &pdu->h323_message_body.alerting);
1085                break;
1086        case eH323_UU_PDU_h323_message_body_facility:
1087                ret = process_facility(skb, ct, ctinfo, data, dataoff,
1088                                       &pdu->h323_message_body.facility);
1089                break;
1090        case eH323_UU_PDU_h323_message_body_progress:
1091                ret = process_progress(skb, ct, ctinfo, data, dataoff,
1092                                       &pdu->h323_message_body.progress);
1093                break;
1094        default:
1095                pr_debug("nf_ct_q931: Q.931 signal %d\n",
1096                         pdu->h323_message_body.choice);
1097                break;
1098        }
1099
1100        if (ret < 0)
1101                return -1;
1102
1103        if (pdu->options & eH323_UU_PDU_h245Control) {
1104                for (i = 0; i < pdu->h245Control.count; i++) {
1105                        ret = process_h245(skb, ct, ctinfo, data, dataoff,
1106                                           &pdu->h245Control.item[i]);
1107                        if (ret < 0)
1108                                return -1;
1109                }
1110        }
1111
1112        return 0;
1113}
1114
1115/****************************************************************************/
1116static int q931_help(struct sk_buff *skb, unsigned int protoff,
1117                     struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1118{
1119        static Q931 q931;
1120        unsigned char *data = NULL;
1121        int datalen;
1122        int dataoff;
1123        int ret;
1124
1125        /* Until there's been traffic both ways, don't look in packets. */
1126        if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
1127                return NF_ACCEPT;
1128
1129        pr_debug("nf_ct_q931: skblen = %u\n", skb->len);
1130
1131        spin_lock_bh(&nf_h323_lock);
1132
1133        /* Process each TPKT */
1134        while (get_tpkt_data(skb, protoff, ct, ctinfo,
1135                             &data, &datalen, &dataoff)) {
1136                pr_debug("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                        pr_debug("nf_ct_q931: decoding error: %s\n",
1143                                 ret == H323_ERROR_BOUND ?
1144                                 "out of bound" : "out of range");
1145                        /* We don't drop when decoding error */
1146                        break;
1147                }
1148
1149                /* Process Q.931 signal */
1150                if (process_q931(skb, ct, ctinfo, &data, dataoff, &q931) < 0)
1151                        goto drop;
1152        }
1153
1154        spin_unlock_bh(&nf_h323_lock);
1155        return NF_ACCEPT;
1156
1157      drop:
1158        spin_unlock_bh(&nf_h323_lock);
1159        net_info_ratelimited("nf_ct_q931: packet dropped\n");
1160        return NF_DROP;
1161}
1162
1163/****************************************************************************/
1164static const struct nf_conntrack_expect_policy q931_exp_policy = {
1165        /* T.120 and H.245 */
1166        .max_expected           = H323_RTP_CHANNEL_MAX * 4 + 4,
1167        .timeout                = 240,
1168};
1169
1170static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
1171        {
1172                .name                   = "Q.931",
1173                .me                     = THIS_MODULE,
1174                .data_len               = sizeof(struct nf_ct_h323_master),
1175                .tuple.src.l3num        = AF_INET,
1176                .tuple.src.u.tcp.port   = cpu_to_be16(Q931_PORT),
1177                .tuple.dst.protonum     = IPPROTO_TCP,
1178                .help                   = q931_help,
1179                .expect_policy          = &q931_exp_policy,
1180        },
1181        {
1182                .name                   = "Q.931",
1183                .me                     = THIS_MODULE,
1184                .tuple.src.l3num        = AF_INET6,
1185                .tuple.src.u.tcp.port   = cpu_to_be16(Q931_PORT),
1186                .tuple.dst.protonum     = IPPROTO_TCP,
1187                .help                   = q931_help,
1188                .expect_policy          = &q931_exp_policy,
1189        },
1190};
1191
1192/****************************************************************************/
1193static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff,
1194                                   int *datalen)
1195{
1196        const struct udphdr *uh;
1197        struct udphdr _uh;
1198        int dataoff;
1199
1200        uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh);
1201        if (uh == NULL)
1202                return NULL;
1203        dataoff = protoff + sizeof(_uh);
1204        if (dataoff >= skb->len)
1205                return NULL;
1206        *datalen = skb->len - dataoff;
1207        return skb_header_pointer(skb, dataoff, *datalen, h323_buffer);
1208}
1209
1210/****************************************************************************/
1211static struct nf_conntrack_expect *find_expect(struct nf_conn *ct,
1212                                               union nf_inet_addr *addr,
1213                                               __be16 port)
1214{
1215        struct net *net = nf_ct_net(ct);
1216        struct nf_conntrack_expect *exp;
1217        struct nf_conntrack_tuple tuple;
1218
1219        memset(&tuple.src.u3, 0, sizeof(tuple.src.u3));
1220        tuple.src.u.tcp.port = 0;
1221        memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3));
1222        tuple.dst.u.tcp.port = port;
1223        tuple.dst.protonum = IPPROTO_TCP;
1224
1225        exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple);
1226        if (exp && exp->master == ct)
1227                return exp;
1228        return NULL;
1229}
1230
1231/****************************************************************************/
1232static int set_expect_timeout(struct nf_conntrack_expect *exp,
1233                              unsigned int timeout)
1234{
1235        if (!exp || !del_timer(&exp->timeout))
1236                return 0;
1237
1238        exp->timeout.expires = jiffies + timeout * HZ;
1239        add_timer(&exp->timeout);
1240
1241        return 1;
1242}
1243
1244/****************************************************************************/
1245static int expect_q931(struct sk_buff *skb, struct nf_conn *ct,
1246                       enum ip_conntrack_info ctinfo,
1247                       unsigned char **data,
1248                       TransportAddress *taddr, int count)
1249{
1250        struct nf_ct_h323_master *info = nfct_help_data(ct);
1251        int dir = CTINFO2DIR(ctinfo);
1252        int ret = 0;
1253        int i;
1254        __be16 port;
1255        union nf_inet_addr addr;
1256        struct nf_conntrack_expect *exp;
1257        typeof(nat_q931_hook) nat_q931;
1258
1259        /* Look for the first related address */
1260        for (i = 0; i < count; i++) {
1261                if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) &&
1262                    memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3,
1263                           sizeof(addr)) == 0 && port != 0)
1264                        break;
1265        }
1266
1267        if (i >= count)         /* Not found */
1268                return 0;
1269
1270        /* Create expect for Q.931 */
1271        if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1272                return -1;
1273        nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1274                          gkrouted_only ? /* only accept calls from GK? */
1275                                &ct->tuplehash[!dir].tuple.src.u3 : NULL,
1276                          &ct->tuplehash[!dir].tuple.dst.u3,
1277                          IPPROTO_TCP, NULL, &port);
1278        exp->helper = nf_conntrack_helper_q931;
1279        exp->flags = NF_CT_EXPECT_PERMANENT;    /* Accept multiple calls */
1280
1281        nat_q931 = rcu_dereference(nat_q931_hook);
1282        if (nat_q931 && ct->status & IPS_NAT_MASK) {    /* Need NAT */
1283                ret = nat_q931(skb, ct, ctinfo, data, taddr, i, port, exp);
1284        } else {                /* Conntrack only */
1285                if (nf_ct_expect_related(exp) == 0) {
1286                        pr_debug("nf_ct_ras: expect Q.931 ");
1287                        nf_ct_dump_tuple(&exp->tuple);
1288
1289                        /* Save port for looking up expect in processing RCF */
1290                        info->sig_port[dir] = port;
1291                } else
1292                        ret = -1;
1293        }
1294
1295        nf_ct_expect_put(exp);
1296
1297        return ret;
1298}
1299
1300/****************************************************************************/
1301static int process_grq(struct sk_buff *skb, struct nf_conn *ct,
1302                       enum ip_conntrack_info ctinfo,
1303                       unsigned char **data, GatekeeperRequest *grq)
1304{
1305        typeof(set_ras_addr_hook) set_ras_addr;
1306
1307        pr_debug("nf_ct_ras: GRQ\n");
1308
1309        set_ras_addr = rcu_dereference(set_ras_addr_hook);
1310        if (set_ras_addr && ct->status & IPS_NAT_MASK)  /* NATed */
1311                return set_ras_addr(skb, ct, ctinfo, data,
1312                                    &grq->rasAddress, 1);
1313        return 0;
1314}
1315
1316/****************************************************************************/
1317static int process_gcf(struct sk_buff *skb, struct nf_conn *ct,
1318                       enum ip_conntrack_info ctinfo,
1319                       unsigned char **data, GatekeeperConfirm *gcf)
1320{
1321        int dir = CTINFO2DIR(ctinfo);
1322        int ret = 0;
1323        __be16 port;
1324        union nf_inet_addr addr;
1325        struct nf_conntrack_expect *exp;
1326
1327        pr_debug("nf_ct_ras: GCF\n");
1328
1329        if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port))
1330                return 0;
1331
1332        /* Registration port is the same as discovery port */
1333        if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1334            port == ct->tuplehash[dir].tuple.src.u.udp.port)
1335                return 0;
1336
1337        /* Avoid RAS expectation loops. A GCF is never expected. */
1338        if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1339                return 0;
1340
1341        /* Need new expect */
1342        if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1343                return -1;
1344        nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1345                          &ct->tuplehash[!dir].tuple.src.u3, &addr,
1346                          IPPROTO_UDP, NULL, &port);
1347        exp->helper = nf_conntrack_helper_ras;
1348
1349        if (nf_ct_expect_related(exp) == 0) {
1350                pr_debug("nf_ct_ras: expect RAS ");
1351                nf_ct_dump_tuple(&exp->tuple);
1352        } else
1353                ret = -1;
1354
1355        nf_ct_expect_put(exp);
1356
1357        return ret;
1358}
1359
1360/****************************************************************************/
1361static int process_rrq(struct sk_buff *skb, struct nf_conn *ct,
1362                       enum ip_conntrack_info ctinfo,
1363                       unsigned char **data, RegistrationRequest *rrq)
1364{
1365        struct nf_ct_h323_master *info = nfct_help_data(ct);
1366        int ret;
1367        typeof(set_ras_addr_hook) set_ras_addr;
1368
1369        pr_debug("nf_ct_ras: RRQ\n");
1370
1371        ret = expect_q931(skb, ct, ctinfo, data,
1372                          rrq->callSignalAddress.item,
1373                          rrq->callSignalAddress.count);
1374        if (ret < 0)
1375                return -1;
1376
1377        set_ras_addr = rcu_dereference(set_ras_addr_hook);
1378        if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1379                ret = set_ras_addr(skb, ct, ctinfo, data,
1380                                   rrq->rasAddress.item,
1381                                   rrq->rasAddress.count);
1382                if (ret < 0)
1383                        return -1;
1384        }
1385
1386        if (rrq->options & eRegistrationRequest_timeToLive) {
1387                pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive);
1388                info->timeout = rrq->timeToLive;
1389        } else
1390                info->timeout = default_rrq_ttl;
1391
1392        return 0;
1393}
1394
1395/****************************************************************************/
1396static int process_rcf(struct sk_buff *skb, struct nf_conn *ct,
1397                       enum ip_conntrack_info ctinfo,
1398                       unsigned char **data, RegistrationConfirm *rcf)
1399{
1400        struct nf_ct_h323_master *info = nfct_help_data(ct);
1401        int dir = CTINFO2DIR(ctinfo);
1402        int ret;
1403        struct nf_conntrack_expect *exp;
1404        typeof(set_sig_addr_hook) set_sig_addr;
1405
1406        pr_debug("nf_ct_ras: RCF\n");
1407
1408        set_sig_addr = rcu_dereference(set_sig_addr_hook);
1409        if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1410                ret = set_sig_addr(skb, ct, ctinfo, data,
1411                                        rcf->callSignalAddress.item,
1412                                        rcf->callSignalAddress.count);
1413                if (ret < 0)
1414                        return -1;
1415        }
1416
1417        if (rcf->options & eRegistrationConfirm_timeToLive) {
1418                pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive);
1419                info->timeout = rcf->timeToLive;
1420        }
1421
1422        if (info->timeout > 0) {
1423                pr_debug("nf_ct_ras: set RAS connection timeout to "
1424                         "%u seconds\n", info->timeout);
1425                nf_ct_refresh(ct, skb, info->timeout * HZ);
1426
1427                /* Set expect timeout */
1428                spin_lock_bh(&nf_conntrack_lock);
1429                exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3,
1430                                  info->sig_port[!dir]);
1431                if (exp) {
1432                        pr_debug("nf_ct_ras: set Q.931 expect "
1433                                 "timeout to %u seconds for",
1434                                 info->timeout);
1435                        nf_ct_dump_tuple(&exp->tuple);
1436                        set_expect_timeout(exp, info->timeout);
1437                }
1438                spin_unlock_bh(&nf_conntrack_lock);
1439        }
1440
1441        return 0;
1442}
1443
1444/****************************************************************************/
1445static int process_urq(struct sk_buff *skb, struct nf_conn *ct,
1446                       enum ip_conntrack_info ctinfo,
1447                       unsigned char **data, UnregistrationRequest *urq)
1448{
1449        struct nf_ct_h323_master *info = nfct_help_data(ct);
1450        int dir = CTINFO2DIR(ctinfo);
1451        int ret;
1452        typeof(set_sig_addr_hook) set_sig_addr;
1453
1454        pr_debug("nf_ct_ras: URQ\n");
1455
1456        set_sig_addr = rcu_dereference(set_sig_addr_hook);
1457        if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1458                ret = set_sig_addr(skb, ct, ctinfo, data,
1459                                   urq->callSignalAddress.item,
1460                                   urq->callSignalAddress.count);
1461                if (ret < 0)
1462                        return -1;
1463        }
1464
1465        /* Clear old expect */
1466        nf_ct_remove_expectations(ct);
1467        info->sig_port[dir] = 0;
1468        info->sig_port[!dir] = 0;
1469
1470        /* Give it 30 seconds for UCF or URJ */
1471        nf_ct_refresh(ct, skb, 30 * HZ);
1472
1473        return 0;
1474}
1475
1476/****************************************************************************/
1477static int process_arq(struct sk_buff *skb, struct nf_conn *ct,
1478                       enum ip_conntrack_info ctinfo,
1479                       unsigned char **data, AdmissionRequest *arq)
1480{
1481        const struct nf_ct_h323_master *info = nfct_help_data(ct);
1482        int dir = CTINFO2DIR(ctinfo);
1483        __be16 port;
1484        union nf_inet_addr addr;
1485        typeof(set_h225_addr_hook) set_h225_addr;
1486
1487        pr_debug("nf_ct_ras: ARQ\n");
1488
1489        set_h225_addr = rcu_dereference(set_h225_addr_hook);
1490        if ((arq->options & eAdmissionRequest_destCallSignalAddress) &&
1491            get_h225_addr(ct, *data, &arq->destCallSignalAddress,
1492                          &addr, &port) &&
1493            !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1494            port == info->sig_port[dir] &&
1495            set_h225_addr && ct->status & IPS_NAT_MASK) {
1496                /* Answering ARQ */
1497                return set_h225_addr(skb, data, 0,
1498                                     &arq->destCallSignalAddress,
1499                                     &ct->tuplehash[!dir].tuple.dst.u3,
1500                                     info->sig_port[!dir]);
1501        }
1502
1503        if ((arq->options & eAdmissionRequest_srcCallSignalAddress) &&
1504            get_h225_addr(ct, *data, &arq->srcCallSignalAddress,
1505                          &addr, &port) &&
1506            !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) &&
1507            set_h225_addr && ct->status & IPS_NAT_MASK) {
1508                /* Calling ARQ */
1509                return set_h225_addr(skb, data, 0,
1510                                     &arq->srcCallSignalAddress,
1511                                     &ct->tuplehash[!dir].tuple.dst.u3,
1512                                     port);
1513        }
1514
1515        return 0;
1516}
1517
1518/****************************************************************************/
1519static int process_acf(struct sk_buff *skb, struct nf_conn *ct,
1520                       enum ip_conntrack_info ctinfo,
1521                       unsigned char **data, AdmissionConfirm *acf)
1522{
1523        int dir = CTINFO2DIR(ctinfo);
1524        int ret = 0;
1525        __be16 port;
1526        union nf_inet_addr addr;
1527        struct nf_conntrack_expect *exp;
1528        typeof(set_sig_addr_hook) set_sig_addr;
1529
1530        pr_debug("nf_ct_ras: ACF\n");
1531
1532        if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress,
1533                           &addr, &port))
1534                return 0;
1535
1536        if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) {
1537                /* Answering ACF */
1538                set_sig_addr = rcu_dereference(set_sig_addr_hook);
1539                if (set_sig_addr && ct->status & IPS_NAT_MASK)
1540                        return set_sig_addr(skb, ct, ctinfo, data,
1541                                            &acf->destCallSignalAddress, 1);
1542                return 0;
1543        }
1544
1545        /* Need new expect */
1546        if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1547                return -1;
1548        nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1549                          &ct->tuplehash[!dir].tuple.src.u3, &addr,
1550                          IPPROTO_TCP, NULL, &port);
1551        exp->flags = NF_CT_EXPECT_PERMANENT;
1552        exp->helper = nf_conntrack_helper_q931;
1553
1554        if (nf_ct_expect_related(exp) == 0) {
1555                pr_debug("nf_ct_ras: expect Q.931 ");
1556                nf_ct_dump_tuple(&exp->tuple);
1557        } else
1558                ret = -1;
1559
1560        nf_ct_expect_put(exp);
1561
1562        return ret;
1563}
1564
1565/****************************************************************************/
1566static int process_lrq(struct sk_buff *skb, struct nf_conn *ct,
1567                       enum ip_conntrack_info ctinfo,
1568                       unsigned char **data, LocationRequest *lrq)
1569{
1570        typeof(set_ras_addr_hook) set_ras_addr;
1571
1572        pr_debug("nf_ct_ras: LRQ\n");
1573
1574        set_ras_addr = rcu_dereference(set_ras_addr_hook);
1575        if (set_ras_addr && ct->status & IPS_NAT_MASK)
1576                return set_ras_addr(skb, ct, ctinfo, data,
1577                                    &lrq->replyAddress, 1);
1578        return 0;
1579}
1580
1581/****************************************************************************/
1582static int process_lcf(struct sk_buff *skb, struct nf_conn *ct,
1583                       enum ip_conntrack_info ctinfo,
1584                       unsigned char **data, LocationConfirm *lcf)
1585{
1586        int dir = CTINFO2DIR(ctinfo);
1587        int ret = 0;
1588        __be16 port;
1589        union nf_inet_addr addr;
1590        struct nf_conntrack_expect *exp;
1591
1592        pr_debug("nf_ct_ras: LCF\n");
1593
1594        if (!get_h225_addr(ct, *data, &lcf->callSignalAddress,
1595                           &addr, &port))
1596                return 0;
1597
1598        /* Need new expect for call signal */
1599        if ((exp = nf_ct_expect_alloc(ct)) == NULL)
1600                return -1;
1601        nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct),
1602                          &ct->tuplehash[!dir].tuple.src.u3, &addr,
1603                          IPPROTO_TCP, NULL, &port);
1604        exp->flags = NF_CT_EXPECT_PERMANENT;
1605        exp->helper = nf_conntrack_helper_q931;
1606
1607        if (nf_ct_expect_related(exp) == 0) {
1608                pr_debug("nf_ct_ras: expect Q.931 ");
1609                nf_ct_dump_tuple(&exp->tuple);
1610        } else
1611                ret = -1;
1612
1613        nf_ct_expect_put(exp);
1614
1615        /* Ignore rasAddress */
1616
1617        return ret;
1618}
1619
1620/****************************************************************************/
1621static int process_irr(struct sk_buff *skb, struct nf_conn *ct,
1622                       enum ip_conntrack_info ctinfo,
1623                       unsigned char **data, InfoRequestResponse *irr)
1624{
1625        int ret;
1626        typeof(set_ras_addr_hook) set_ras_addr;
1627        typeof(set_sig_addr_hook) set_sig_addr;
1628
1629        pr_debug("nf_ct_ras: IRR\n");
1630
1631        set_ras_addr = rcu_dereference(set_ras_addr_hook);
1632        if (set_ras_addr && ct->status & IPS_NAT_MASK) {
1633                ret = set_ras_addr(skb, ct, ctinfo, data,
1634                                   &irr->rasAddress, 1);
1635                if (ret < 0)
1636                        return -1;
1637        }
1638
1639        set_sig_addr = rcu_dereference(set_sig_addr_hook);
1640        if (set_sig_addr && ct->status & IPS_NAT_MASK) {
1641                ret = set_sig_addr(skb, ct, ctinfo, data,
1642                                        irr->callSignalAddress.item,
1643                                        irr->callSignalAddress.count);
1644                if (ret < 0)
1645                        return -1;
1646        }
1647
1648        return 0;
1649}
1650
1651/****************************************************************************/
1652static int process_ras(struct sk_buff *skb, struct nf_conn *ct,
1653                       enum ip_conntrack_info ctinfo,
1654                       unsigned char **data, RasMessage *ras)
1655{
1656        switch (ras->choice) {
1657        case eRasMessage_gatekeeperRequest:
1658                return process_grq(skb, ct, ctinfo, data,
1659                                   &ras->gatekeeperRequest);
1660        case eRasMessage_gatekeeperConfirm:
1661                return process_gcf(skb, ct, ctinfo, data,
1662                                   &ras->gatekeeperConfirm);
1663        case eRasMessage_registrationRequest:
1664                return process_rrq(skb, ct, ctinfo, data,
1665                                   &ras->registrationRequest);
1666        case eRasMessage_registrationConfirm:
1667                return process_rcf(skb, ct, ctinfo, data,
1668                                   &ras->registrationConfirm);
1669        case eRasMessage_unregistrationRequest:
1670                return process_urq(skb, ct, ctinfo, data,
1671                                   &ras->unregistrationRequest);
1672        case eRasMessage_admissionRequest:
1673                return process_arq(skb, ct, ctinfo, data,
1674                                   &ras->admissionRequest);
1675        case eRasMessage_admissionConfirm:
1676                return process_acf(skb, ct, ctinfo, data,
1677                                   &ras->admissionConfirm);
1678        case eRasMessage_locationRequest:
1679                return process_lrq(skb, ct, ctinfo, data,
1680                                   &ras->locationRequest);
1681        case eRasMessage_locationConfirm:
1682                return process_lcf(skb, ct, ctinfo, data,
1683                                   &ras->locationConfirm);
1684        case eRasMessage_infoRequestResponse:
1685                return process_irr(skb, ct, ctinfo, data,
1686                                   &ras->infoRequestResponse);
1687        default:
1688                pr_debug("nf_ct_ras: RAS message %d\n", ras->choice);
1689                break;
1690        }
1691
1692        return 0;
1693}
1694
1695/****************************************************************************/
1696static int ras_help(struct sk_buff *skb, unsigned int protoff,
1697                    struct nf_conn *ct, enum ip_conntrack_info ctinfo)
1698{
1699        static RasMessage ras;
1700        unsigned char *data;
1701        int datalen = 0;
1702        int ret;
1703
1704        pr_debug("nf_ct_ras: skblen = %u\n", skb->len);
1705
1706        spin_lock_bh(&nf_h323_lock);
1707
1708        /* Get UDP data */
1709        data = get_udp_data(skb, protoff, &datalen);
1710        if (data == NULL)
1711                goto accept;
1712        pr_debug("nf_ct_ras: RAS message len=%d ", datalen);
1713        nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple);
1714
1715        /* Decode RAS message */
1716        ret = DecodeRasMessage(data, datalen, &ras);
1717        if (ret < 0) {
1718                pr_debug("nf_ct_ras: decoding error: %s\n",
1719                         ret == H323_ERROR_BOUND ?
1720                         "out of bound" : "out of range");
1721                goto accept;
1722        }
1723
1724        /* Process RAS message */
1725        if (process_ras(skb, ct, ctinfo, &data, &ras) < 0)
1726                goto drop;
1727
1728      accept:
1729        spin_unlock_bh(&nf_h323_lock);
1730        return NF_ACCEPT;
1731
1732      drop:
1733        spin_unlock_bh(&nf_h323_lock);
1734        net_info_ratelimited("nf_ct_ras: packet dropped\n");
1735        return NF_DROP;
1736}
1737
1738/****************************************************************************/
1739static const struct nf_conntrack_expect_policy ras_exp_policy = {
1740        .max_expected           = 32,
1741        .timeout                = 240,
1742};
1743
1744static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
1745        {
1746                .name                   = "RAS",
1747                .me                     = THIS_MODULE,
1748                .data_len               = sizeof(struct nf_ct_h323_master),
1749                .tuple.src.l3num        = AF_INET,
1750                .tuple.src.u.udp.port   = cpu_to_be16(RAS_PORT),
1751                .tuple.dst.protonum     = IPPROTO_UDP,
1752                .help                   = ras_help,
1753                .expect_policy          = &ras_exp_policy,
1754        },
1755        {
1756                .name                   = "RAS",
1757                .me                     = THIS_MODULE,
1758                .data_len               = sizeof(struct nf_ct_h323_master),
1759                .tuple.src.l3num        = AF_INET6,
1760                .tuple.src.u.udp.port   = cpu_to_be16(RAS_PORT),
1761                .tuple.dst.protonum     = IPPROTO_UDP,
1762                .help                   = ras_help,
1763                .expect_policy          = &ras_exp_policy,
1764        },
1765};
1766
1767/****************************************************************************/
1768static void __exit nf_conntrack_h323_fini(void)
1769{
1770        nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]);
1771        nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1772        nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1773        nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1774        nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1775        kfree(h323_buffer);
1776        pr_debug("nf_ct_h323: fini\n");
1777}
1778
1779/****************************************************************************/
1780static int __init nf_conntrack_h323_init(void)
1781{
1782        int ret;
1783
1784        h323_buffer = kmalloc(65536, GFP_KERNEL);
1785        if (!h323_buffer)
1786                return -ENOMEM;
1787        ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245);
1788        if (ret < 0)
1789                goto err1;
1790        ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]);
1791        if (ret < 0)
1792                goto err2;
1793        ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]);
1794        if (ret < 0)
1795                goto err3;
1796        ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]);
1797        if (ret < 0)
1798                goto err4;
1799        ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]);
1800        if (ret < 0)
1801                goto err5;
1802        pr_debug("nf_ct_h323: init success\n");
1803        return 0;
1804
1805err5:
1806        nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]);
1807err4:
1808        nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]);
1809err3:
1810        nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]);
1811err2:
1812        nf_conntrack_helper_unregister(&nf_conntrack_helper_h245);
1813err1:
1814        kfree(h323_buffer);
1815        return ret;
1816}
1817
1818/****************************************************************************/
1819module_init(nf_conntrack_h323_init);
1820module_exit(nf_conntrack_h323_fini);
1821
1822EXPORT_SYMBOL_GPL(get_h225_addr);
1823EXPORT_SYMBOL_GPL(set_h245_addr_hook);
1824EXPORT_SYMBOL_GPL(set_h225_addr_hook);
1825EXPORT_SYMBOL_GPL(set_sig_addr_hook);
1826EXPORT_SYMBOL_GPL(set_ras_addr_hook);
1827EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook);
1828EXPORT_SYMBOL_GPL(nat_t120_hook);
1829EXPORT_SYMBOL_GPL(nat_h245_hook);
1830EXPORT_SYMBOL_GPL(nat_callforwarding_hook);
1831EXPORT_SYMBOL_GPL(nat_q931_hook);
1832
1833MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>");
1834MODULE_DESCRIPTION("H.323 connection tracking helper");
1835MODULE_LICENSE("GPL");
1836MODULE_ALIAS("ip_conntrack_h323");
1837MODULE_ALIAS_NFCT_HELPER("RAS");
1838MODULE_ALIAS_NFCT_HELPER("Q.931");
1839MODULE_ALIAS_NFCT_HELPER("H.245");
1840
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