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 28 #include <net/netfilter/nf_conntrack.h> 29 #include <net/netfilter/nf_conntrack_core.h> 30 #include <net/netfilter/nf_conntrack_tuple.h> 31 #include <net/netfilter/nf_conntrack_expect.h> 32 #include <net/netfilter/nf_conntrack_ecache.h> 33 #include <net/netfilter/nf_conntrack_helper.h> 34 #include <net/netfilter/nf_conntrack_zones.h> 35 #include <linux/netfilter/nf_conntrack_h323.h> 36 37 /* Parameters */ 38 static unsigned int default_rrq_ttl __read_mostly = 300; 39 module_param(default_rrq_ttl, uint, 0600); 40 MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); 41 42 static int gkrouted_only __read_mostly = 1; 43 module_param(gkrouted_only, int, 0600); 44 MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); 45 46 static bool callforward_filter __read_mostly = true; 47 module_param(callforward_filter, bool, 0600); 48 MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " 49 "if both endpoints are on different sides " 50 "(determined by routing information)"); 51 52 /* Hooks for NAT */ 53 int (*set_h245_addr_hook) (struct sk_buff *skb, unsigned int protoff, 54 unsigned char **data, int dataoff, 55 H245_TransportAddress *taddr, 56 union nf_inet_addr *addr, __be16 port) 57 __read_mostly; 58 int (*set_h225_addr_hook) (struct sk_buff *skb, unsigned int protoff, 59 unsigned char **data, int dataoff, 60 TransportAddress *taddr, 61 union nf_inet_addr *addr, __be16 port) 62 __read_mostly; 63 int (*set_sig_addr_hook) (struct sk_buff *skb, 64 struct nf_conn *ct, 65 enum ip_conntrack_info ctinfo, 66 unsigned int protoff, unsigned char **data, 67 TransportAddress *taddr, int count) __read_mostly; 68 int (*set_ras_addr_hook) (struct sk_buff *skb, 69 struct nf_conn *ct, 70 enum ip_conntrack_info ctinfo, 71 unsigned int protoff, unsigned char **data, 72 TransportAddress *taddr, int count) __read_mostly; 73 int (*nat_rtp_rtcp_hook) (struct sk_buff *skb, 74 struct nf_conn *ct, 75 enum ip_conntrack_info ctinfo, 76 unsigned int protoff, 77 unsigned char **data, int dataoff, 78 H245_TransportAddress *taddr, 79 __be16 port, __be16 rtp_port, 80 struct nf_conntrack_expect *rtp_exp, 81 struct nf_conntrack_expect *rtcp_exp) __read_mostly; 82 int (*nat_t120_hook) (struct sk_buff *skb, 83 struct nf_conn *ct, 84 enum ip_conntrack_info ctinfo, 85 unsigned int protoff, 86 unsigned char **data, int dataoff, 87 H245_TransportAddress *taddr, __be16 port, 88 struct nf_conntrack_expect *exp) __read_mostly; 89 int (*nat_h245_hook) (struct sk_buff *skb, 90 struct nf_conn *ct, 91 enum ip_conntrack_info ctinfo, 92 unsigned int protoff, 93 unsigned char **data, int dataoff, 94 TransportAddress *taddr, __be16 port, 95 struct nf_conntrack_expect *exp) __read_mostly; 96 int (*nat_callforwarding_hook) (struct sk_buff *skb, 97 struct nf_conn *ct, 98 enum ip_conntrack_info ctinfo, 99 unsigned int protoff, 100 unsigned char **data, int dataoff, 101 TransportAddress *taddr, __be16 port, 102 struct nf_conntrack_expect *exp) __read_mostly; 103 int (*nat_q931_hook) (struct sk_buff *skb, 104 struct nf_conn *ct, 105 enum ip_conntrack_info ctinfo, 106 unsigned int protoff, 107 unsigned char **data, TransportAddress *taddr, int idx, 108 __be16 port, struct nf_conntrack_expect *exp) 109 __read_mostly; 110 111 static DEFINE_SPINLOCK(nf_h323_lock); 112 static char *h323_buffer; 113 114 static struct nf_conntrack_helper nf_conntrack_helper_h245; 115 static struct nf_conntrack_helper nf_conntrack_helper_q931[]; 116 static struct nf_conntrack_helper nf_conntrack_helper_ras[]; 117 118 /****************************************************************************/ 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 /****************************************************************************/ 223 static int get_h245_addr(struct nf_conn *ct, const unsigned char *data, 224 H245_TransportAddress *taddr, 225 union nf_inet_addr *addr, __be16 *port) 226 { 227 const unsigned char *p; 228 int len; 229 230 if (taddr->choice != eH245_TransportAddress_unicastAddress) 231 return 0; 232 233 switch (taddr->unicastAddress.choice) { 234 case eUnicastAddress_iPAddress: 235 if (nf_ct_l3num(ct) != AF_INET) 236 return 0; 237 p = data + taddr->unicastAddress.iPAddress.network; 238 len = 4; 239 break; 240 case eUnicastAddress_iP6Address: 241 if (nf_ct_l3num(ct) != AF_INET6) 242 return 0; 243 p = data + taddr->unicastAddress.iP6Address.network; 244 len = 16; 245 break; 246 default: 247 return 0; 248 } 249 250 memcpy(addr, p, len); 251 memset((void *)addr + len, 0, sizeof(*addr) - len); 252 memcpy(port, p + len, sizeof(__be16)); 253 254 return 1; 255 } 256 257 /****************************************************************************/ 258 static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct, 259 enum ip_conntrack_info ctinfo, 260 unsigned int protoff, 261 unsigned char **data, int dataoff, 262 H245_TransportAddress *taddr) 263 { 264 int dir = CTINFO2DIR(ctinfo); 265 int ret = 0; 266 __be16 port; 267 __be16 rtp_port, rtcp_port; 268 union nf_inet_addr addr; 269 struct nf_conntrack_expect *rtp_exp; 270 struct nf_conntrack_expect *rtcp_exp; 271 typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; 272 273 /* Read RTP or RTCP address */ 274 if (!get_h245_addr(ct, *data, taddr, &addr, &port) || 275 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || 276 port == 0) 277 return 0; 278 279 /* RTP port is even */ 280 rtp_port = port & ~htons(1); 281 rtcp_port = port | htons(1); 282 283 /* Create expect for RTP */ 284 if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL) 285 return -1; 286 nf_ct_expect_init(rtp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 287 &ct->tuplehash[!dir].tuple.src.u3, 288 &ct->tuplehash[!dir].tuple.dst.u3, 289 IPPROTO_UDP, NULL, &rtp_port); 290 291 /* Create expect for RTCP */ 292 if ((rtcp_exp = nf_ct_expect_alloc(ct)) == NULL) { 293 nf_ct_expect_put(rtp_exp); 294 return -1; 295 } 296 nf_ct_expect_init(rtcp_exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 297 &ct->tuplehash[!dir].tuple.src.u3, 298 &ct->tuplehash[!dir].tuple.dst.u3, 299 IPPROTO_UDP, NULL, &rtcp_port); 300 301 if (memcmp(&ct->tuplehash[dir].tuple.src.u3, 302 &ct->tuplehash[!dir].tuple.dst.u3, 303 sizeof(ct->tuplehash[dir].tuple.src.u3)) && 304 (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && 305 nf_ct_l3num(ct) == NFPROTO_IPV4 && 306 ct->status & IPS_NAT_MASK) { 307 /* NAT needed */ 308 ret = nat_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, 309 taddr, port, rtp_port, rtp_exp, rtcp_exp); 310 } else { /* Conntrack only */ 311 if (nf_ct_expect_related(rtp_exp) == 0) { 312 if (nf_ct_expect_related(rtcp_exp) == 0) { 313 pr_debug("nf_ct_h323: expect RTP "); 314 nf_ct_dump_tuple(&rtp_exp->tuple); 315 pr_debug("nf_ct_h323: expect RTCP "); 316 nf_ct_dump_tuple(&rtcp_exp->tuple); 317 } else { 318 nf_ct_unexpect_related(rtp_exp); 319 ret = -1; 320 } 321 } else 322 ret = -1; 323 } 324 325 nf_ct_expect_put(rtp_exp); 326 nf_ct_expect_put(rtcp_exp); 327 328 return ret; 329 } 330 331 /****************************************************************************/ 332 static int expect_t120(struct sk_buff *skb, 333 struct nf_conn *ct, 334 enum ip_conntrack_info ctinfo, 335 unsigned int protoff, 336 unsigned char **data, int dataoff, 337 H245_TransportAddress *taddr) 338 { 339 int dir = CTINFO2DIR(ctinfo); 340 int ret = 0; 341 __be16 port; 342 union nf_inet_addr addr; 343 struct nf_conntrack_expect *exp; 344 typeof(nat_t120_hook) nat_t120; 345 346 /* Read T.120 address */ 347 if (!get_h245_addr(ct, *data, taddr, &addr, &port) || 348 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || 349 port == 0) 350 return 0; 351 352 /* Create expect for T.120 connections */ 353 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 354 return -1; 355 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 356 &ct->tuplehash[!dir].tuple.src.u3, 357 &ct->tuplehash[!dir].tuple.dst.u3, 358 IPPROTO_TCP, NULL, &port); 359 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ 360 361 if (memcmp(&ct->tuplehash[dir].tuple.src.u3, 362 &ct->tuplehash[!dir].tuple.dst.u3, 363 sizeof(ct->tuplehash[dir].tuple.src.u3)) && 364 (nat_t120 = rcu_dereference(nat_t120_hook)) && 365 nf_ct_l3num(ct) == NFPROTO_IPV4 && 366 ct->status & IPS_NAT_MASK) { 367 /* NAT needed */ 368 ret = nat_t120(skb, ct, ctinfo, protoff, data, dataoff, taddr, 369 port, exp); 370 } else { /* Conntrack only */ 371 if (nf_ct_expect_related(exp) == 0) { 372 pr_debug("nf_ct_h323: expect T.120 "); 373 nf_ct_dump_tuple(&exp->tuple); 374 } else 375 ret = -1; 376 } 377 378 nf_ct_expect_put(exp); 379 380 return ret; 381 } 382 383 /****************************************************************************/ 384 static int process_h245_channel(struct sk_buff *skb, 385 struct nf_conn *ct, 386 enum ip_conntrack_info ctinfo, 387 unsigned int protoff, 388 unsigned char **data, int dataoff, 389 H2250LogicalChannelParameters *channel) 390 { 391 int ret; 392 393 if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { 394 /* RTP */ 395 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, 396 &channel->mediaChannel); 397 if (ret < 0) 398 return -1; 399 } 400 401 if (channel-> 402 options & eH2250LogicalChannelParameters_mediaControlChannel) { 403 /* RTCP */ 404 ret = expect_rtp_rtcp(skb, ct, ctinfo, protoff, data, dataoff, 405 &channel->mediaControlChannel); 406 if (ret < 0) 407 return -1; 408 } 409 410 return 0; 411 } 412 413 /****************************************************************************/ 414 static int process_olc(struct sk_buff *skb, struct nf_conn *ct, 415 enum ip_conntrack_info ctinfo, 416 unsigned int protoff, 417 unsigned char **data, int dataoff, 418 OpenLogicalChannel *olc) 419 { 420 int ret; 421 422 pr_debug("nf_ct_h323: OpenLogicalChannel\n"); 423 424 if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == 425 eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) 426 { 427 ret = process_h245_channel(skb, ct, ctinfo, 428 protoff, data, dataoff, 429 &olc-> 430 forwardLogicalChannelParameters. 431 multiplexParameters. 432 h2250LogicalChannelParameters); 433 if (ret < 0) 434 return -1; 435 } 436 437 if ((olc->options & 438 eOpenLogicalChannel_reverseLogicalChannelParameters) && 439 (olc->reverseLogicalChannelParameters.options & 440 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) 441 && (olc->reverseLogicalChannelParameters.multiplexParameters. 442 choice == 443 eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) 444 { 445 ret = 446 process_h245_channel(skb, ct, ctinfo, 447 protoff, data, dataoff, 448 &olc-> 449 reverseLogicalChannelParameters. 450 multiplexParameters. 451 h2250LogicalChannelParameters); 452 if (ret < 0) 453 return -1; 454 } 455 456 if ((olc->options & eOpenLogicalChannel_separateStack) && 457 olc->forwardLogicalChannelParameters.dataType.choice == 458 eDataType_data && 459 olc->forwardLogicalChannelParameters.dataType.data.application. 460 choice == eDataApplicationCapability_application_t120 && 461 olc->forwardLogicalChannelParameters.dataType.data.application. 462 t120.choice == eDataProtocolCapability_separateLANStack && 463 olc->separateStack.networkAddress.choice == 464 eNetworkAccessParameters_networkAddress_localAreaAddress) { 465 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff, 466 &olc->separateStack.networkAddress. 467 localAreaAddress); 468 if (ret < 0) 469 return -1; 470 } 471 472 return 0; 473 } 474 475 /****************************************************************************/ 476 static int process_olca(struct sk_buff *skb, struct nf_conn *ct, 477 enum ip_conntrack_info ctinfo, 478 unsigned int protoff, unsigned char **data, int dataoff, 479 OpenLogicalChannelAck *olca) 480 { 481 H2250LogicalChannelAckParameters *ack; 482 int ret; 483 484 pr_debug("nf_ct_h323: OpenLogicalChannelAck\n"); 485 486 if ((olca->options & 487 eOpenLogicalChannelAck_reverseLogicalChannelParameters) && 488 (olca->reverseLogicalChannelParameters.options & 489 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) 490 && (olca->reverseLogicalChannelParameters.multiplexParameters. 491 choice == 492 eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) 493 { 494 ret = process_h245_channel(skb, ct, ctinfo, 495 protoff, data, dataoff, 496 &olca-> 497 reverseLogicalChannelParameters. 498 multiplexParameters. 499 h2250LogicalChannelParameters); 500 if (ret < 0) 501 return -1; 502 } 503 504 if ((olca->options & 505 eOpenLogicalChannelAck_forwardMultiplexAckParameters) && 506 (olca->forwardMultiplexAckParameters.choice == 507 eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) 508 { 509 ack = &olca->forwardMultiplexAckParameters. 510 h2250LogicalChannelAckParameters; 511 if (ack->options & 512 eH2250LogicalChannelAckParameters_mediaChannel) { 513 /* RTP */ 514 ret = expect_rtp_rtcp(skb, ct, ctinfo, 515 protoff, data, dataoff, 516 &ack->mediaChannel); 517 if (ret < 0) 518 return -1; 519 } 520 521 if (ack->options & 522 eH2250LogicalChannelAckParameters_mediaControlChannel) { 523 /* RTCP */ 524 ret = expect_rtp_rtcp(skb, ct, ctinfo, 525 protoff, data, dataoff, 526 &ack->mediaControlChannel); 527 if (ret < 0) 528 return -1; 529 } 530 } 531 532 if ((olca->options & eOpenLogicalChannelAck_separateStack) && 533 olca->separateStack.networkAddress.choice == 534 eNetworkAccessParameters_networkAddress_localAreaAddress) { 535 ret = expect_t120(skb, ct, ctinfo, protoff, data, dataoff, 536 &olca->separateStack.networkAddress. 537 localAreaAddress); 538 if (ret < 0) 539 return -1; 540 } 541 542 return 0; 543 } 544 545 /****************************************************************************/ 546 static int process_h245(struct sk_buff *skb, struct nf_conn *ct, 547 enum ip_conntrack_info ctinfo, 548 unsigned int protoff, unsigned char **data, int dataoff, 549 MultimediaSystemControlMessage *mscm) 550 { 551 switch (mscm->choice) { 552 case eMultimediaSystemControlMessage_request: 553 if (mscm->request.choice == 554 eRequestMessage_openLogicalChannel) { 555 return process_olc(skb, ct, ctinfo, 556 protoff, data, dataoff, 557 &mscm->request.openLogicalChannel); 558 } 559 pr_debug("nf_ct_h323: H.245 Request %d\n", 560 mscm->request.choice); 561 break; 562 case eMultimediaSystemControlMessage_response: 563 if (mscm->response.choice == 564 eResponseMessage_openLogicalChannelAck) { 565 return process_olca(skb, ct, ctinfo, 566 protoff, data, dataoff, 567 &mscm->response. 568 openLogicalChannelAck); 569 } 570 pr_debug("nf_ct_h323: H.245 Response %d\n", 571 mscm->response.choice); 572 break; 573 default: 574 pr_debug("nf_ct_h323: H.245 signal %d\n", mscm->choice); 575 break; 576 } 577 578 return 0; 579 } 580 581 /****************************************************************************/ 582 static int h245_help(struct sk_buff *skb, unsigned int protoff, 583 struct nf_conn *ct, enum ip_conntrack_info ctinfo) 584 { 585 static MultimediaSystemControlMessage mscm; 586 unsigned char *data = NULL; 587 int datalen; 588 int dataoff; 589 int ret; 590 591 /* Until there's been traffic both ways, don't look in packets. */ 592 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) 593 return NF_ACCEPT; 594 595 pr_debug("nf_ct_h245: skblen = %u\n", skb->len); 596 597 spin_lock_bh(&nf_h323_lock); 598 599 /* Process each TPKT */ 600 while (get_tpkt_data(skb, protoff, ct, ctinfo, 601 &data, &datalen, &dataoff)) { 602 pr_debug("nf_ct_h245: TPKT len=%d ", datalen); 603 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); 604 605 /* Decode H.245 signal */ 606 ret = DecodeMultimediaSystemControlMessage(data, datalen, 607 &mscm); 608 if (ret < 0) { 609 pr_debug("nf_ct_h245: decoding error: %s\n", 610 ret == H323_ERROR_BOUND ? 611 "out of bound" : "out of range"); 612 /* We don't drop when decoding error */ 613 break; 614 } 615 616 /* Process H.245 signal */ 617 if (process_h245(skb, ct, ctinfo, protoff, 618 &data, dataoff, &mscm) < 0) 619 goto drop; 620 } 621 622 spin_unlock_bh(&nf_h323_lock); 623 return NF_ACCEPT; 624 625 drop: 626 spin_unlock_bh(&nf_h323_lock); 627 nf_ct_helper_log(skb, ct, "cannot process H.245 message"); 628 return NF_DROP; 629 } 630 631 /****************************************************************************/ 632 static const struct nf_conntrack_expect_policy h245_exp_policy = { 633 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, 634 .timeout = 240, 635 }; 636 637 static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { 638 .name = "H.245", 639 .me = THIS_MODULE, 640 .tuple.src.l3num = AF_UNSPEC, 641 .tuple.dst.protonum = IPPROTO_UDP, 642 .help = h245_help, 643 .expect_policy = &h245_exp_policy, 644 }; 645 646 /****************************************************************************/ 647 int get_h225_addr(struct nf_conn *ct, unsigned char *data, 648 TransportAddress *taddr, 649 union nf_inet_addr *addr, __be16 *port) 650 { 651 const unsigned char *p; 652 int len; 653 654 switch (taddr->choice) { 655 case eTransportAddress_ipAddress: 656 if (nf_ct_l3num(ct) != AF_INET) 657 return 0; 658 p = data + taddr->ipAddress.ip; 659 len = 4; 660 break; 661 case eTransportAddress_ip6Address: 662 if (nf_ct_l3num(ct) != AF_INET6) 663 return 0; 664 p = data + taddr->ip6Address.ip; 665 len = 16; 666 break; 667 default: 668 return 0; 669 } 670 671 memcpy(addr, p, len); 672 memset((void *)addr + len, 0, sizeof(*addr) - len); 673 memcpy(port, p + len, sizeof(__be16)); 674 675 return 1; 676 } 677 678 /****************************************************************************/ 679 static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, 680 enum ip_conntrack_info ctinfo, 681 unsigned int protoff, unsigned char **data, int dataoff, 682 TransportAddress *taddr) 683 { 684 int dir = CTINFO2DIR(ctinfo); 685 int ret = 0; 686 __be16 port; 687 union nf_inet_addr addr; 688 struct nf_conntrack_expect *exp; 689 typeof(nat_h245_hook) nat_h245; 690 691 /* Read h245Address */ 692 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || 693 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || 694 port == 0) 695 return 0; 696 697 /* Create expect for h245 connection */ 698 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 699 return -1; 700 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 701 &ct->tuplehash[!dir].tuple.src.u3, 702 &ct->tuplehash[!dir].tuple.dst.u3, 703 IPPROTO_TCP, NULL, &port); 704 exp->helper = &nf_conntrack_helper_h245; 705 706 if (memcmp(&ct->tuplehash[dir].tuple.src.u3, 707 &ct->tuplehash[!dir].tuple.dst.u3, 708 sizeof(ct->tuplehash[dir].tuple.src.u3)) && 709 (nat_h245 = rcu_dereference(nat_h245_hook)) && 710 nf_ct_l3num(ct) == NFPROTO_IPV4 && 711 ct->status & IPS_NAT_MASK) { 712 /* NAT needed */ 713 ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr, 714 port, exp); 715 } else { /* Conntrack only */ 716 if (nf_ct_expect_related(exp) == 0) { 717 pr_debug("nf_ct_q931: expect H.245 "); 718 nf_ct_dump_tuple(&exp->tuple); 719 } else 720 ret = -1; 721 } 722 723 nf_ct_expect_put(exp); 724 725 return ret; 726 } 727 728 /* If the calling party is on the same side of the forward-to party, 729 * we don't need to track the second call */ 730 static int callforward_do_filter(struct net *net, 731 const union nf_inet_addr *src, 732 const union nf_inet_addr *dst, 733 u_int8_t family) 734 { 735 const struct nf_afinfo *afinfo; 736 int ret = 0; 737 738 /* rcu_read_lock()ed by nf_hook_thresh */ 739 afinfo = nf_get_afinfo(family); 740 if (!afinfo) 741 return 0; 742 743 switch (family) { 744 case AF_INET: { 745 struct flowi4 fl1, fl2; 746 struct rtable *rt1, *rt2; 747 748 memset(&fl1, 0, sizeof(fl1)); 749 fl1.daddr = src->ip; 750 751 memset(&fl2, 0, sizeof(fl2)); 752 fl2.daddr = dst->ip; 753 if (!afinfo->route(net, (struct dst_entry **)&rt1, 754 flowi4_to_flowi(&fl1), false)) { 755 if (!afinfo->route(net, (struct dst_entry **)&rt2, 756 flowi4_to_flowi(&fl2), false)) { 757 if (rt_nexthop(rt1, fl1.daddr) == 758 rt_nexthop(rt2, fl2.daddr) && 759 rt1->dst.dev == rt2->dst.dev) 760 ret = 1; 761 dst_release(&rt2->dst); 762 } 763 dst_release(&rt1->dst); 764 } 765 break; 766 } 767 #if IS_ENABLED(CONFIG_NF_CONNTRACK_IPV6) 768 case AF_INET6: { 769 struct flowi6 fl1, fl2; 770 struct rt6_info *rt1, *rt2; 771 772 memset(&fl1, 0, sizeof(fl1)); 773 fl1.daddr = src->in6; 774 775 memset(&fl2, 0, sizeof(fl2)); 776 fl2.daddr = dst->in6; 777 if (!afinfo->route(net, (struct dst_entry **)&rt1, 778 flowi6_to_flowi(&fl1), false)) { 779 if (!afinfo->route(net, (struct dst_entry **)&rt2, 780 flowi6_to_flowi(&fl2), false)) { 781 if (ipv6_addr_equal(rt6_nexthop(rt1, &fl1.daddr), 782 rt6_nexthop(rt2, &fl2.daddr)) && 783 rt1->dst.dev == rt2->dst.dev) 784 ret = 1; 785 dst_release(&rt2->dst); 786 } 787 dst_release(&rt1->dst); 788 } 789 break; 790 } 791 #endif 792 } 793 return ret; 794 795 } 796 797 /****************************************************************************/ 798 static int expect_callforwarding(struct sk_buff *skb, 799 struct nf_conn *ct, 800 enum ip_conntrack_info ctinfo, 801 unsigned int protoff, 802 unsigned char **data, int dataoff, 803 TransportAddress *taddr) 804 { 805 int dir = CTINFO2DIR(ctinfo); 806 int ret = 0; 807 __be16 port; 808 union nf_inet_addr addr; 809 struct nf_conntrack_expect *exp; 810 struct net *net = nf_ct_net(ct); 811 typeof(nat_callforwarding_hook) nat_callforwarding; 812 813 /* Read alternativeAddress */ 814 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) 815 return 0; 816 817 /* If the calling party is on the same side of the forward-to party, 818 * we don't need to track the second call */ 819 if (callforward_filter && 820 callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3, 821 nf_ct_l3num(ct))) { 822 pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); 823 return 0; 824 } 825 826 /* Create expect for the second call leg */ 827 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 828 return -1; 829 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 830 &ct->tuplehash[!dir].tuple.src.u3, &addr, 831 IPPROTO_TCP, NULL, &port); 832 exp->helper = nf_conntrack_helper_q931; 833 834 if (memcmp(&ct->tuplehash[dir].tuple.src.u3, 835 &ct->tuplehash[!dir].tuple.dst.u3, 836 sizeof(ct->tuplehash[dir].tuple.src.u3)) && 837 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && 838 nf_ct_l3num(ct) == NFPROTO_IPV4 && 839 ct->status & IPS_NAT_MASK) { 840 /* Need NAT */ 841 ret = nat_callforwarding(skb, ct, ctinfo, 842 protoff, data, dataoff, 843 taddr, port, exp); 844 } else { /* Conntrack only */ 845 if (nf_ct_expect_related(exp) == 0) { 846 pr_debug("nf_ct_q931: expect Call Forwarding "); 847 nf_ct_dump_tuple(&exp->tuple); 848 } else 849 ret = -1; 850 } 851 852 nf_ct_expect_put(exp); 853 854 return ret; 855 } 856 857 /****************************************************************************/ 858 static int process_setup(struct sk_buff *skb, struct nf_conn *ct, 859 enum ip_conntrack_info ctinfo, 860 unsigned int protoff, 861 unsigned char **data, int dataoff, 862 Setup_UUIE *setup) 863 { 864 int dir = CTINFO2DIR(ctinfo); 865 int ret; 866 int i; 867 __be16 port; 868 union nf_inet_addr addr; 869 typeof(set_h225_addr_hook) set_h225_addr; 870 871 pr_debug("nf_ct_q931: Setup\n"); 872 873 if (setup->options & eSetup_UUIE_h245Address) { 874 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 875 &setup->h245Address); 876 if (ret < 0) 877 return -1; 878 } 879 880 set_h225_addr = rcu_dereference(set_h225_addr_hook); 881 if ((setup->options & eSetup_UUIE_destCallSignalAddress) && 882 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && 883 ct->status & IPS_NAT_MASK && 884 get_h225_addr(ct, *data, &setup->destCallSignalAddress, 885 &addr, &port) && 886 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { 887 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", 888 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, 889 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); 890 ret = set_h225_addr(skb, protoff, data, dataoff, 891 &setup->destCallSignalAddress, 892 &ct->tuplehash[!dir].tuple.src.u3, 893 ct->tuplehash[!dir].tuple.src.u.tcp.port); 894 if (ret < 0) 895 return -1; 896 } 897 898 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && 899 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && 900 ct->status & IPS_NAT_MASK && 901 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, 902 &addr, &port) && 903 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { 904 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", 905 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, 906 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); 907 ret = set_h225_addr(skb, protoff, data, dataoff, 908 &setup->sourceCallSignalAddress, 909 &ct->tuplehash[!dir].tuple.dst.u3, 910 ct->tuplehash[!dir].tuple.dst.u.tcp.port); 911 if (ret < 0) 912 return -1; 913 } 914 915 if (setup->options & eSetup_UUIE_fastStart) { 916 for (i = 0; i < setup->fastStart.count; i++) { 917 ret = process_olc(skb, ct, ctinfo, 918 protoff, data, dataoff, 919 &setup->fastStart.item[i]); 920 if (ret < 0) 921 return -1; 922 } 923 } 924 925 return 0; 926 } 927 928 /****************************************************************************/ 929 static int process_callproceeding(struct sk_buff *skb, 930 struct nf_conn *ct, 931 enum ip_conntrack_info ctinfo, 932 unsigned int protoff, 933 unsigned char **data, int dataoff, 934 CallProceeding_UUIE *callproc) 935 { 936 int ret; 937 int i; 938 939 pr_debug("nf_ct_q931: CallProceeding\n"); 940 941 if (callproc->options & eCallProceeding_UUIE_h245Address) { 942 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 943 &callproc->h245Address); 944 if (ret < 0) 945 return -1; 946 } 947 948 if (callproc->options & eCallProceeding_UUIE_fastStart) { 949 for (i = 0; i < callproc->fastStart.count; i++) { 950 ret = process_olc(skb, ct, ctinfo, 951 protoff, data, dataoff, 952 &callproc->fastStart.item[i]); 953 if (ret < 0) 954 return -1; 955 } 956 } 957 958 return 0; 959 } 960 961 /****************************************************************************/ 962 static int process_connect(struct sk_buff *skb, struct nf_conn *ct, 963 enum ip_conntrack_info ctinfo, 964 unsigned int protoff, 965 unsigned char **data, int dataoff, 966 Connect_UUIE *connect) 967 { 968 int ret; 969 int i; 970 971 pr_debug("nf_ct_q931: Connect\n"); 972 973 if (connect->options & eConnect_UUIE_h245Address) { 974 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 975 &connect->h245Address); 976 if (ret < 0) 977 return -1; 978 } 979 980 if (connect->options & eConnect_UUIE_fastStart) { 981 for (i = 0; i < connect->fastStart.count; i++) { 982 ret = process_olc(skb, ct, ctinfo, 983 protoff, data, dataoff, 984 &connect->fastStart.item[i]); 985 if (ret < 0) 986 return -1; 987 } 988 } 989 990 return 0; 991 } 992 993 /****************************************************************************/ 994 static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, 995 enum ip_conntrack_info ctinfo, 996 unsigned int protoff, 997 unsigned char **data, int dataoff, 998 Alerting_UUIE *alert) 999 { 1000 int ret; 1001 int i; 1002 1003 pr_debug("nf_ct_q931: Alerting\n"); 1004 1005 if (alert->options & eAlerting_UUIE_h245Address) { 1006 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 1007 &alert->h245Address); 1008 if (ret < 0) 1009 return -1; 1010 } 1011 1012 if (alert->options & eAlerting_UUIE_fastStart) { 1013 for (i = 0; i < alert->fastStart.count; i++) { 1014 ret = process_olc(skb, ct, ctinfo, 1015 protoff, data, dataoff, 1016 &alert->fastStart.item[i]); 1017 if (ret < 0) 1018 return -1; 1019 } 1020 } 1021 1022 return 0; 1023 } 1024 1025 /****************************************************************************/ 1026 static int process_facility(struct sk_buff *skb, struct nf_conn *ct, 1027 enum ip_conntrack_info ctinfo, 1028 unsigned int protoff, 1029 unsigned char **data, int dataoff, 1030 Facility_UUIE *facility) 1031 { 1032 int ret; 1033 int i; 1034 1035 pr_debug("nf_ct_q931: Facility\n"); 1036 1037 if (facility->reason.choice == eFacilityReason_callForwarded) { 1038 if (facility->options & eFacility_UUIE_alternativeAddress) 1039 return expect_callforwarding(skb, ct, ctinfo, 1040 protoff, data, dataoff, 1041 &facility-> 1042 alternativeAddress); 1043 return 0; 1044 } 1045 1046 if (facility->options & eFacility_UUIE_h245Address) { 1047 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 1048 &facility->h245Address); 1049 if (ret < 0) 1050 return -1; 1051 } 1052 1053 if (facility->options & eFacility_UUIE_fastStart) { 1054 for (i = 0; i < facility->fastStart.count; i++) { 1055 ret = process_olc(skb, ct, ctinfo, 1056 protoff, data, dataoff, 1057 &facility->fastStart.item[i]); 1058 if (ret < 0) 1059 return -1; 1060 } 1061 } 1062 1063 return 0; 1064 } 1065 1066 /****************************************************************************/ 1067 static int process_progress(struct sk_buff *skb, struct nf_conn *ct, 1068 enum ip_conntrack_info ctinfo, 1069 unsigned int protoff, 1070 unsigned char **data, int dataoff, 1071 Progress_UUIE *progress) 1072 { 1073 int ret; 1074 int i; 1075 1076 pr_debug("nf_ct_q931: Progress\n"); 1077 1078 if (progress->options & eProgress_UUIE_h245Address) { 1079 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 1080 &progress->h245Address); 1081 if (ret < 0) 1082 return -1; 1083 } 1084 1085 if (progress->options & eProgress_UUIE_fastStart) { 1086 for (i = 0; i < progress->fastStart.count; i++) { 1087 ret = process_olc(skb, ct, ctinfo, 1088 protoff, data, dataoff, 1089 &progress->fastStart.item[i]); 1090 if (ret < 0) 1091 return -1; 1092 } 1093 } 1094 1095 return 0; 1096 } 1097 1098 /****************************************************************************/ 1099 static int process_q931(struct sk_buff *skb, struct nf_conn *ct, 1100 enum ip_conntrack_info ctinfo, 1101 unsigned int protoff, unsigned char **data, int dataoff, 1102 Q931 *q931) 1103 { 1104 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; 1105 int i; 1106 int ret = 0; 1107 1108 switch (pdu->h323_message_body.choice) { 1109 case eH323_UU_PDU_h323_message_body_setup: 1110 ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff, 1111 &pdu->h323_message_body.setup); 1112 break; 1113 case eH323_UU_PDU_h323_message_body_callProceeding: 1114 ret = process_callproceeding(skb, ct, ctinfo, 1115 protoff, data, dataoff, 1116 &pdu->h323_message_body. 1117 callProceeding); 1118 break; 1119 case eH323_UU_PDU_h323_message_body_connect: 1120 ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff, 1121 &pdu->h323_message_body.connect); 1122 break; 1123 case eH323_UU_PDU_h323_message_body_alerting: 1124 ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff, 1125 &pdu->h323_message_body.alerting); 1126 break; 1127 case eH323_UU_PDU_h323_message_body_facility: 1128 ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff, 1129 &pdu->h323_message_body.facility); 1130 break; 1131 case eH323_UU_PDU_h323_message_body_progress: 1132 ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff, 1133 &pdu->h323_message_body.progress); 1134 break; 1135 default: 1136 pr_debug("nf_ct_q931: Q.931 signal %d\n", 1137 pdu->h323_message_body.choice); 1138 break; 1139 } 1140 1141 if (ret < 0) 1142 return -1; 1143 1144 if (pdu->options & eH323_UU_PDU_h245Control) { 1145 for (i = 0; i < pdu->h245Control.count; i++) { 1146 ret = process_h245(skb, ct, ctinfo, 1147 protoff, data, dataoff, 1148 &pdu->h245Control.item[i]); 1149 if (ret < 0) 1150 return -1; 1151 } 1152 } 1153 1154 return 0; 1155 } 1156 1157 /****************************************************************************/ 1158 static int q931_help(struct sk_buff *skb, unsigned int protoff, 1159 struct nf_conn *ct, enum ip_conntrack_info ctinfo) 1160 { 1161 static Q931 q931; 1162 unsigned char *data = NULL; 1163 int datalen; 1164 int dataoff; 1165 int ret; 1166 1167 /* Until there's been traffic both ways, don't look in packets. */ 1168 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) 1169 return NF_ACCEPT; 1170 1171 pr_debug("nf_ct_q931: skblen = %u\n", skb->len); 1172 1173 spin_lock_bh(&nf_h323_lock); 1174 1175 /* Process each TPKT */ 1176 while (get_tpkt_data(skb, protoff, ct, ctinfo, 1177 &data, &datalen, &dataoff)) { 1178 pr_debug("nf_ct_q931: TPKT len=%d ", datalen); 1179 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); 1180 1181 /* Decode Q.931 signal */ 1182 ret = DecodeQ931(data, datalen, &q931); 1183 if (ret < 0) { 1184 pr_debug("nf_ct_q931: decoding error: %s\n", 1185 ret == H323_ERROR_BOUND ? 1186 "out of bound" : "out of range"); 1187 /* We don't drop when decoding error */ 1188 break; 1189 } 1190 1191 /* Process Q.931 signal */ 1192 if (process_q931(skb, ct, ctinfo, protoff, 1193 &data, dataoff, &q931) < 0) 1194 goto drop; 1195 } 1196 1197 spin_unlock_bh(&nf_h323_lock); 1198 return NF_ACCEPT; 1199 1200 drop: 1201 spin_unlock_bh(&nf_h323_lock); 1202 nf_ct_helper_log(skb, ct, "cannot process Q.931 message"); 1203 return NF_DROP; 1204 } 1205 1206 /****************************************************************************/ 1207 static const struct nf_conntrack_expect_policy q931_exp_policy = { 1208 /* T.120 and H.245 */ 1209 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, 1210 .timeout = 240, 1211 }; 1212 1213 static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { 1214 { 1215 .name = "Q.931", 1216 .me = THIS_MODULE, 1217 .tuple.src.l3num = AF_INET, 1218 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), 1219 .tuple.dst.protonum = IPPROTO_TCP, 1220 .help = q931_help, 1221 .expect_policy = &q931_exp_policy, 1222 }, 1223 { 1224 .name = "Q.931", 1225 .me = THIS_MODULE, 1226 .tuple.src.l3num = AF_INET6, 1227 .tuple.src.u.tcp.port = cpu_to_be16(Q931_PORT), 1228 .tuple.dst.protonum = IPPROTO_TCP, 1229 .help = q931_help, 1230 .expect_policy = &q931_exp_policy, 1231 }, 1232 }; 1233 1234 /****************************************************************************/ 1235 static unsigned char *get_udp_data(struct sk_buff *skb, unsigned int protoff, 1236 int *datalen) 1237 { 1238 const struct udphdr *uh; 1239 struct udphdr _uh; 1240 int dataoff; 1241 1242 uh = skb_header_pointer(skb, protoff, sizeof(_uh), &_uh); 1243 if (uh == NULL) 1244 return NULL; 1245 dataoff = protoff + sizeof(_uh); 1246 if (dataoff >= skb->len) 1247 return NULL; 1248 *datalen = skb->len - dataoff; 1249 return skb_header_pointer(skb, dataoff, *datalen, h323_buffer); 1250 } 1251 1252 /****************************************************************************/ 1253 static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, 1254 union nf_inet_addr *addr, 1255 __be16 port) 1256 { 1257 struct net *net = nf_ct_net(ct); 1258 struct nf_conntrack_expect *exp; 1259 struct nf_conntrack_tuple tuple; 1260 1261 memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); 1262 tuple.src.u.tcp.port = 0; 1263 memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); 1264 tuple.dst.u.tcp.port = port; 1265 tuple.dst.protonum = IPPROTO_TCP; 1266 1267 exp = __nf_ct_expect_find(net, nf_ct_zone(ct), &tuple); 1268 if (exp && exp->master == ct) 1269 return exp; 1270 return NULL; 1271 } 1272 1273 /****************************************************************************/ 1274 static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, 1275 enum ip_conntrack_info ctinfo, 1276 unsigned int protoff, unsigned char **data, 1277 TransportAddress *taddr, int count) 1278 { 1279 struct nf_ct_h323_master *info = nfct_help_data(ct); 1280 int dir = CTINFO2DIR(ctinfo); 1281 int ret = 0; 1282 int i; 1283 __be16 port; 1284 union nf_inet_addr addr; 1285 struct nf_conntrack_expect *exp; 1286 typeof(nat_q931_hook) nat_q931; 1287 1288 /* Look for the first related address */ 1289 for (i = 0; i < count; i++) { 1290 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && 1291 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, 1292 sizeof(addr)) == 0 && port != 0) 1293 break; 1294 } 1295 1296 if (i >= count) /* Not found */ 1297 return 0; 1298 1299 /* Create expect for Q.931 */ 1300 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 1301 return -1; 1302 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 1303 gkrouted_only ? /* only accept calls from GK? */ 1304 &ct->tuplehash[!dir].tuple.src.u3 : NULL, 1305 &ct->tuplehash[!dir].tuple.dst.u3, 1306 IPPROTO_TCP, NULL, &port); 1307 exp->helper = nf_conntrack_helper_q931; 1308 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ 1309 1310 nat_q931 = rcu_dereference(nat_q931_hook); 1311 if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1312 ct->status & IPS_NAT_MASK) { /* Need NAT */ 1313 ret = nat_q931(skb, ct, ctinfo, protoff, data, 1314 taddr, i, port, exp); 1315 } else { /* Conntrack only */ 1316 if (nf_ct_expect_related(exp) == 0) { 1317 pr_debug("nf_ct_ras: expect Q.931 "); 1318 nf_ct_dump_tuple(&exp->tuple); 1319 1320 /* Save port for looking up expect in processing RCF */ 1321 info->sig_port[dir] = port; 1322 } else 1323 ret = -1; 1324 } 1325 1326 nf_ct_expect_put(exp); 1327 1328 return ret; 1329 } 1330 1331 /****************************************************************************/ 1332 static int process_grq(struct sk_buff *skb, struct nf_conn *ct, 1333 enum ip_conntrack_info ctinfo, 1334 unsigned int protoff, 1335 unsigned char **data, GatekeeperRequest *grq) 1336 { 1337 typeof(set_ras_addr_hook) set_ras_addr; 1338 1339 pr_debug("nf_ct_ras: GRQ\n"); 1340 1341 set_ras_addr = rcu_dereference(set_ras_addr_hook); 1342 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1343 ct->status & IPS_NAT_MASK) /* NATed */ 1344 return set_ras_addr(skb, ct, ctinfo, protoff, data, 1345 &grq->rasAddress, 1); 1346 return 0; 1347 } 1348 1349 /****************************************************************************/ 1350 static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, 1351 enum ip_conntrack_info ctinfo, 1352 unsigned int protoff, 1353 unsigned char **data, GatekeeperConfirm *gcf) 1354 { 1355 int dir = CTINFO2DIR(ctinfo); 1356 int ret = 0; 1357 __be16 port; 1358 union nf_inet_addr addr; 1359 struct nf_conntrack_expect *exp; 1360 1361 pr_debug("nf_ct_ras: GCF\n"); 1362 1363 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) 1364 return 0; 1365 1366 /* Registration port is the same as discovery port */ 1367 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && 1368 port == ct->tuplehash[dir].tuple.src.u.udp.port) 1369 return 0; 1370 1371 /* Avoid RAS expectation loops. A GCF is never expected. */ 1372 if (test_bit(IPS_EXPECTED_BIT, &ct->status)) 1373 return 0; 1374 1375 /* Need new expect */ 1376 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 1377 return -1; 1378 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 1379 &ct->tuplehash[!dir].tuple.src.u3, &addr, 1380 IPPROTO_UDP, NULL, &port); 1381 exp->helper = nf_conntrack_helper_ras; 1382 1383 if (nf_ct_expect_related(exp) == 0) { 1384 pr_debug("nf_ct_ras: expect RAS "); 1385 nf_ct_dump_tuple(&exp->tuple); 1386 } else 1387 ret = -1; 1388 1389 nf_ct_expect_put(exp); 1390 1391 return ret; 1392 } 1393 1394 /****************************************************************************/ 1395 static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, 1396 enum ip_conntrack_info ctinfo, 1397 unsigned int protoff, 1398 unsigned char **data, RegistrationRequest *rrq) 1399 { 1400 struct nf_ct_h323_master *info = nfct_help_data(ct); 1401 int ret; 1402 typeof(set_ras_addr_hook) set_ras_addr; 1403 1404 pr_debug("nf_ct_ras: RRQ\n"); 1405 1406 ret = expect_q931(skb, ct, ctinfo, protoff, data, 1407 rrq->callSignalAddress.item, 1408 rrq->callSignalAddress.count); 1409 if (ret < 0) 1410 return -1; 1411 1412 set_ras_addr = rcu_dereference(set_ras_addr_hook); 1413 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1414 ct->status & IPS_NAT_MASK) { 1415 ret = set_ras_addr(skb, ct, ctinfo, protoff, data, 1416 rrq->rasAddress.item, 1417 rrq->rasAddress.count); 1418 if (ret < 0) 1419 return -1; 1420 } 1421 1422 if (rrq->options & eRegistrationRequest_timeToLive) { 1423 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); 1424 info->timeout = rrq->timeToLive; 1425 } else 1426 info->timeout = default_rrq_ttl; 1427 1428 return 0; 1429 } 1430 1431 /****************************************************************************/ 1432 static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, 1433 enum ip_conntrack_info ctinfo, 1434 unsigned int protoff, 1435 unsigned char **data, RegistrationConfirm *rcf) 1436 { 1437 struct nf_ct_h323_master *info = nfct_help_data(ct); 1438 int dir = CTINFO2DIR(ctinfo); 1439 int ret; 1440 struct nf_conntrack_expect *exp; 1441 typeof(set_sig_addr_hook) set_sig_addr; 1442 1443 pr_debug("nf_ct_ras: RCF\n"); 1444 1445 set_sig_addr = rcu_dereference(set_sig_addr_hook); 1446 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1447 ct->status & IPS_NAT_MASK) { 1448 ret = set_sig_addr(skb, ct, ctinfo, protoff, data, 1449 rcf->callSignalAddress.item, 1450 rcf->callSignalAddress.count); 1451 if (ret < 0) 1452 return -1; 1453 } 1454 1455 if (rcf->options & eRegistrationConfirm_timeToLive) { 1456 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); 1457 info->timeout = rcf->timeToLive; 1458 } 1459 1460 if (info->timeout > 0) { 1461 pr_debug("nf_ct_ras: set RAS connection timeout to " 1462 "%u seconds\n", info->timeout); 1463 nf_ct_refresh(ct, skb, info->timeout * HZ); 1464 1465 /* Set expect timeout */ 1466 spin_lock_bh(&nf_conntrack_expect_lock); 1467 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, 1468 info->sig_port[!dir]); 1469 if (exp) { 1470 pr_debug("nf_ct_ras: set Q.931 expect " 1471 "timeout to %u seconds for", 1472 info->timeout); 1473 nf_ct_dump_tuple(&exp->tuple); 1474 mod_timer_pending(&exp->timeout, 1475 jiffies + info->timeout * HZ); 1476 } 1477 spin_unlock_bh(&nf_conntrack_expect_lock); 1478 } 1479 1480 return 0; 1481 } 1482 1483 /****************************************************************************/ 1484 static int process_urq(struct sk_buff *skb, struct nf_conn *ct, 1485 enum ip_conntrack_info ctinfo, 1486 unsigned int protoff, 1487 unsigned char **data, UnregistrationRequest *urq) 1488 { 1489 struct nf_ct_h323_master *info = nfct_help_data(ct); 1490 int dir = CTINFO2DIR(ctinfo); 1491 int ret; 1492 typeof(set_sig_addr_hook) set_sig_addr; 1493 1494 pr_debug("nf_ct_ras: URQ\n"); 1495 1496 set_sig_addr = rcu_dereference(set_sig_addr_hook); 1497 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1498 ct->status & IPS_NAT_MASK) { 1499 ret = set_sig_addr(skb, ct, ctinfo, protoff, data, 1500 urq->callSignalAddress.item, 1501 urq->callSignalAddress.count); 1502 if (ret < 0) 1503 return -1; 1504 } 1505 1506 /* Clear old expect */ 1507 nf_ct_remove_expectations(ct); 1508 info->sig_port[dir] = 0; 1509 info->sig_port[!dir] = 0; 1510 1511 /* Give it 30 seconds for UCF or URJ */ 1512 nf_ct_refresh(ct, skb, 30 * HZ); 1513 1514 return 0; 1515 } 1516 1517 /****************************************************************************/ 1518 static int process_arq(struct sk_buff *skb, struct nf_conn *ct, 1519 enum ip_conntrack_info ctinfo, 1520 unsigned int protoff, 1521 unsigned char **data, AdmissionRequest *arq) 1522 { 1523 const struct nf_ct_h323_master *info = nfct_help_data(ct); 1524 int dir = CTINFO2DIR(ctinfo); 1525 __be16 port; 1526 union nf_inet_addr addr; 1527 typeof(set_h225_addr_hook) set_h225_addr; 1528 1529 pr_debug("nf_ct_ras: ARQ\n"); 1530 1531 set_h225_addr = rcu_dereference(set_h225_addr_hook); 1532 if ((arq->options & eAdmissionRequest_destCallSignalAddress) && 1533 get_h225_addr(ct, *data, &arq->destCallSignalAddress, 1534 &addr, &port) && 1535 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && 1536 port == info->sig_port[dir] && 1537 nf_ct_l3num(ct) == NFPROTO_IPV4 && 1538 set_h225_addr && ct->status & IPS_NAT_MASK) { 1539 /* Answering ARQ */ 1540 return set_h225_addr(skb, protoff, data, 0, 1541 &arq->destCallSignalAddress, 1542 &ct->tuplehash[!dir].tuple.dst.u3, 1543 info->sig_port[!dir]); 1544 } 1545 1546 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && 1547 get_h225_addr(ct, *data, &arq->srcCallSignalAddress, 1548 &addr, &port) && 1549 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && 1550 set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1551 ct->status & IPS_NAT_MASK) { 1552 /* Calling ARQ */ 1553 return set_h225_addr(skb, protoff, data, 0, 1554 &arq->srcCallSignalAddress, 1555 &ct->tuplehash[!dir].tuple.dst.u3, 1556 port); 1557 } 1558 1559 return 0; 1560 } 1561 1562 /****************************************************************************/ 1563 static int process_acf(struct sk_buff *skb, struct nf_conn *ct, 1564 enum ip_conntrack_info ctinfo, 1565 unsigned int protoff, 1566 unsigned char **data, AdmissionConfirm *acf) 1567 { 1568 int dir = CTINFO2DIR(ctinfo); 1569 int ret = 0; 1570 __be16 port; 1571 union nf_inet_addr addr; 1572 struct nf_conntrack_expect *exp; 1573 typeof(set_sig_addr_hook) set_sig_addr; 1574 1575 pr_debug("nf_ct_ras: ACF\n"); 1576 1577 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, 1578 &addr, &port)) 1579 return 0; 1580 1581 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { 1582 /* Answering ACF */ 1583 set_sig_addr = rcu_dereference(set_sig_addr_hook); 1584 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1585 ct->status & IPS_NAT_MASK) 1586 return set_sig_addr(skb, ct, ctinfo, protoff, data, 1587 &acf->destCallSignalAddress, 1); 1588 return 0; 1589 } 1590 1591 /* Need new expect */ 1592 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 1593 return -1; 1594 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 1595 &ct->tuplehash[!dir].tuple.src.u3, &addr, 1596 IPPROTO_TCP, NULL, &port); 1597 exp->flags = NF_CT_EXPECT_PERMANENT; 1598 exp->helper = nf_conntrack_helper_q931; 1599 1600 if (nf_ct_expect_related(exp) == 0) { 1601 pr_debug("nf_ct_ras: expect Q.931 "); 1602 nf_ct_dump_tuple(&exp->tuple); 1603 } else 1604 ret = -1; 1605 1606 nf_ct_expect_put(exp); 1607 1608 return ret; 1609 } 1610 1611 /****************************************************************************/ 1612 static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, 1613 enum ip_conntrack_info ctinfo, 1614 unsigned int protoff, 1615 unsigned char **data, LocationRequest *lrq) 1616 { 1617 typeof(set_ras_addr_hook) set_ras_addr; 1618 1619 pr_debug("nf_ct_ras: LRQ\n"); 1620 1621 set_ras_addr = rcu_dereference(set_ras_addr_hook); 1622 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1623 ct->status & IPS_NAT_MASK) 1624 return set_ras_addr(skb, ct, ctinfo, protoff, data, 1625 &lrq->replyAddress, 1); 1626 return 0; 1627 } 1628 1629 /****************************************************************************/ 1630 static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, 1631 enum ip_conntrack_info ctinfo, 1632 unsigned int protoff, 1633 unsigned char **data, LocationConfirm *lcf) 1634 { 1635 int dir = CTINFO2DIR(ctinfo); 1636 int ret = 0; 1637 __be16 port; 1638 union nf_inet_addr addr; 1639 struct nf_conntrack_expect *exp; 1640 1641 pr_debug("nf_ct_ras: LCF\n"); 1642 1643 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, 1644 &addr, &port)) 1645 return 0; 1646 1647 /* Need new expect for call signal */ 1648 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 1649 return -1; 1650 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 1651 &ct->tuplehash[!dir].tuple.src.u3, &addr, 1652 IPPROTO_TCP, NULL, &port); 1653 exp->flags = NF_CT_EXPECT_PERMANENT; 1654 exp->helper = nf_conntrack_helper_q931; 1655 1656 if (nf_ct_expect_related(exp) == 0) { 1657 pr_debug("nf_ct_ras: expect Q.931 "); 1658 nf_ct_dump_tuple(&exp->tuple); 1659 } else 1660 ret = -1; 1661 1662 nf_ct_expect_put(exp); 1663 1664 /* Ignore rasAddress */ 1665 1666 return ret; 1667 } 1668 1669 /****************************************************************************/ 1670 static int process_irr(struct sk_buff *skb, struct nf_conn *ct, 1671 enum ip_conntrack_info ctinfo, 1672 unsigned int protoff, 1673 unsigned char **data, InfoRequestResponse *irr) 1674 { 1675 int ret; 1676 typeof(set_ras_addr_hook) set_ras_addr; 1677 typeof(set_sig_addr_hook) set_sig_addr; 1678 1679 pr_debug("nf_ct_ras: IRR\n"); 1680 1681 set_ras_addr = rcu_dereference(set_ras_addr_hook); 1682 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1683 ct->status & IPS_NAT_MASK) { 1684 ret = set_ras_addr(skb, ct, ctinfo, protoff, data, 1685 &irr->rasAddress, 1); 1686 if (ret < 0) 1687 return -1; 1688 } 1689 1690 set_sig_addr = rcu_dereference(set_sig_addr_hook); 1691 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1692 ct->status & IPS_NAT_MASK) { 1693 ret = set_sig_addr(skb, ct, ctinfo, protoff, data, 1694 irr->callSignalAddress.item, 1695 irr->callSignalAddress.count); 1696 if (ret < 0) 1697 return -1; 1698 } 1699 1700 return 0; 1701 } 1702 1703 /****************************************************************************/ 1704 static int process_ras(struct sk_buff *skb, struct nf_conn *ct, 1705 enum ip_conntrack_info ctinfo, 1706 unsigned int protoff, 1707 unsigned char **data, RasMessage *ras) 1708 { 1709 switch (ras->choice) { 1710 case eRasMessage_gatekeeperRequest: 1711 return process_grq(skb, ct, ctinfo, protoff, data, 1712 &ras->gatekeeperRequest); 1713 case eRasMessage_gatekeeperConfirm: 1714 return process_gcf(skb, ct, ctinfo, protoff, data, 1715 &ras->gatekeeperConfirm); 1716 case eRasMessage_registrationRequest: 1717 return process_rrq(skb, ct, ctinfo, protoff, data, 1718 &ras->registrationRequest); 1719 case eRasMessage_registrationConfirm: 1720 return process_rcf(skb, ct, ctinfo, protoff, data, 1721 &ras->registrationConfirm); 1722 case eRasMessage_unregistrationRequest: 1723 return process_urq(skb, ct, ctinfo, protoff, data, 1724 &ras->unregistrationRequest); 1725 case eRasMessage_admissionRequest: 1726 return process_arq(skb, ct, ctinfo, protoff, data, 1727 &ras->admissionRequest); 1728 case eRasMessage_admissionConfirm: 1729 return process_acf(skb, ct, ctinfo, protoff, data, 1730 &ras->admissionConfirm); 1731 case eRasMessage_locationRequest: 1732 return process_lrq(skb, ct, ctinfo, protoff, data, 1733 &ras->locationRequest); 1734 case eRasMessage_locationConfirm: 1735 return process_lcf(skb, ct, ctinfo, protoff, data, 1736 &ras->locationConfirm); 1737 case eRasMessage_infoRequestResponse: 1738 return process_irr(skb, ct, ctinfo, protoff, data, 1739 &ras->infoRequestResponse); 1740 default: 1741 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); 1742 break; 1743 } 1744 1745 return 0; 1746 } 1747 1748 /****************************************************************************/ 1749 static int ras_help(struct sk_buff *skb, unsigned int protoff, 1750 struct nf_conn *ct, enum ip_conntrack_info ctinfo) 1751 { 1752 static RasMessage ras; 1753 unsigned char *data; 1754 int datalen = 0; 1755 int ret; 1756 1757 pr_debug("nf_ct_ras: skblen = %u\n", skb->len); 1758 1759 spin_lock_bh(&nf_h323_lock); 1760 1761 /* Get UDP data */ 1762 data = get_udp_data(skb, protoff, &datalen); 1763 if (data == NULL) 1764 goto accept; 1765 pr_debug("nf_ct_ras: RAS message len=%d ", datalen); 1766 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); 1767 1768 /* Decode RAS message */ 1769 ret = DecodeRasMessage(data, datalen, &ras); 1770 if (ret < 0) { 1771 pr_debug("nf_ct_ras: decoding error: %s\n", 1772 ret == H323_ERROR_BOUND ? 1773 "out of bound" : "out of range"); 1774 goto accept; 1775 } 1776 1777 /* Process RAS message */ 1778 if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0) 1779 goto drop; 1780 1781 accept: 1782 spin_unlock_bh(&nf_h323_lock); 1783 return NF_ACCEPT; 1784 1785 drop: 1786 spin_unlock_bh(&nf_h323_lock); 1787 nf_ct_helper_log(skb, ct, "cannot process RAS message"); 1788 return NF_DROP; 1789 } 1790 1791 /****************************************************************************/ 1792 static const struct nf_conntrack_expect_policy ras_exp_policy = { 1793 .max_expected = 32, 1794 .timeout = 240, 1795 }; 1796 1797 static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { 1798 { 1799 .name = "RAS", 1800 .me = THIS_MODULE, 1801 .tuple.src.l3num = AF_INET, 1802 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), 1803 .tuple.dst.protonum = IPPROTO_UDP, 1804 .help = ras_help, 1805 .expect_policy = &ras_exp_policy, 1806 }, 1807 { 1808 .name = "RAS", 1809 .me = THIS_MODULE, 1810 .tuple.src.l3num = AF_INET6, 1811 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), 1812 .tuple.dst.protonum = IPPROTO_UDP, 1813 .help = ras_help, 1814 .expect_policy = &ras_exp_policy, 1815 }, 1816 }; 1817 1818 /****************************************************************************/ 1819 static void __exit nf_conntrack_h323_fini(void) 1820 { 1821 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); 1822 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); 1823 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); 1824 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); 1825 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); 1826 kfree(h323_buffer); 1827 pr_debug("nf_ct_h323: fini\n"); 1828 } 1829 1830 /****************************************************************************/ 1831 static int __init nf_conntrack_h323_init(void) 1832 { 1833 int ret; 1834 1835 NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master)); 1836 1837 h323_buffer = kmalloc(65536, GFP_KERNEL); 1838 if (!h323_buffer) 1839 return -ENOMEM; 1840 ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); 1841 if (ret < 0) 1842 goto err1; 1843 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); 1844 if (ret < 0) 1845 goto err2; 1846 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); 1847 if (ret < 0) 1848 goto err3; 1849 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); 1850 if (ret < 0) 1851 goto err4; 1852 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); 1853 if (ret < 0) 1854 goto err5; 1855 pr_debug("nf_ct_h323: init success\n"); 1856 return 0; 1857 1858 err5: 1859 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); 1860 err4: 1861 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); 1862 err3: 1863 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); 1864 err2: 1865 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); 1866 err1: 1867 kfree(h323_buffer); 1868 return ret; 1869 } 1870 1871 /****************************************************************************/ 1872 module_init(nf_conntrack_h323_init); 1873 module_exit(nf_conntrack_h323_fini); 1874 1875 EXPORT_SYMBOL_GPL(get_h225_addr); 1876 EXPORT_SYMBOL_GPL(set_h245_addr_hook); 1877 EXPORT_SYMBOL_GPL(set_h225_addr_hook); 1878 EXPORT_SYMBOL_GPL(set_sig_addr_hook); 1879 EXPORT_SYMBOL_GPL(set_ras_addr_hook); 1880 EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); 1881 EXPORT_SYMBOL_GPL(nat_t120_hook); 1882 EXPORT_SYMBOL_GPL(nat_h245_hook); 1883 EXPORT_SYMBOL_GPL(nat_callforwarding_hook); 1884 EXPORT_SYMBOL_GPL(nat_q931_hook); 1885 1886 MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); 1887 MODULE_DESCRIPTION("H.323 connection tracking helper"); 1888 MODULE_LICENSE("GPL"); 1889 MODULE_ALIAS("ip_conntrack_h323"); 1890 MODULE_ALIAS_NFCT_HELPER("RAS"); 1891 MODULE_ALIAS_NFCT_HELPER("Q.931"); 1892 MODULE_ALIAS_NFCT_HELPER("H.245"); 1893