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 */ 38static unsigned int default_rrq_ttl __read_mostly = 300; 39module_param(default_rrq_ttl, uint, 0600); 40MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); 41 42static int gkrouted_only __read_mostly = 1; 43module_param(gkrouted_only, int, 0600); 44MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); 45 46static bool callforward_filter __read_mostly = true; 47module_param(callforward_filter, bool, 0600); 48MODULE_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 */ 53int (*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; 58int (*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; 63int (*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; 68int (*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; 73int (*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; 82int (*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; 89int (*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; 96int (*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; 103int (*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 111static DEFINE_SPINLOCK(nf_h323_lock); 112static char *h323_buffer; 113 114static struct nf_conntrack_helper nf_conntrack_helper_h245; 115static struct nf_conntrack_helper nf_conntrack_helper_q931[]; 116static struct nf_conntrack_helper nf_conntrack_helper_ras[]; 117 118/****************************************************************************/ 119static 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/****************************************************************************/ 223static 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/****************************************************************************/ 258static 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/****************************************************************************/ 332static 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/****************************************************************************/ 384static 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/****************************************************************************/ 414static 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/****************************************************************************/ 476static 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/****************************************************************************/ 546static 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/****************************************************************************/ 582static 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/****************************************************************************/ 632static 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 637static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { 638 .name = "H.245", 639 .me = THIS_MODULE, 640 .data_len = sizeof(struct nf_ct_h323_master), 641 .tuple.src.l3num = AF_UNSPEC, 642 .tuple.dst.protonum = IPPROTO_UDP, 643 .help = h245_help, 644 .expect_policy = &h245_exp_policy, 645}; 646 647/****************************************************************************/ 648int get_h225_addr(struct nf_conn *ct, unsigned char *data, 649 TransportAddress *taddr, 650 union nf_inet_addr *addr, __be16 *port) 651{ 652 const unsigned char *p; 653 int len; 654 655 switch (taddr->choice) { 656 case eTransportAddress_ipAddress: 657 if (nf_ct_l3num(ct) != AF_INET) 658 return 0; 659 p = data + taddr->ipAddress.ip; 660 len = 4; 661 break; 662 case eTransportAddress_ip6Address: 663 if (nf_ct_l3num(ct) != AF_INET6) 664 return 0; 665 p = data + taddr->ip6Address.ip; 666 len = 16; 667 break; 668 default: 669 return 0; 670 } 671 672 memcpy(addr, p, len); 673 memset((void *)addr + len, 0, sizeof(*addr) - len); 674 memcpy(port, p + len, sizeof(__be16)); 675 676 return 1; 677} 678 679/****************************************************************************/ 680static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, 681 enum ip_conntrack_info ctinfo, 682 unsigned int protoff, unsigned char **data, int dataoff, 683 TransportAddress *taddr) 684{ 685 int dir = CTINFO2DIR(ctinfo); 686 int ret = 0; 687 __be16 port; 688 union nf_inet_addr addr; 689 struct nf_conntrack_expect *exp; 690 typeof(nat_h245_hook) nat_h245; 691 692 /* Read h245Address */ 693 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || 694 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || 695 port == 0) 696 return 0; 697 698 /* Create expect for h245 connection */ 699 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 700 return -1; 701 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 702 &ct->tuplehash[!dir].tuple.src.u3, 703 &ct->tuplehash[!dir].tuple.dst.u3, 704 IPPROTO_TCP, NULL, &port); 705 exp->helper = &nf_conntrack_helper_h245; 706 707 if (memcmp(&ct->tuplehash[dir].tuple.src.u3, 708 &ct->tuplehash[!dir].tuple.dst.u3, 709 sizeof(ct->tuplehash[dir].tuple.src.u3)) && 710 (nat_h245 = rcu_dereference(nat_h245_hook)) && 711 nf_ct_l3num(ct) == NFPROTO_IPV4 && 712 ct->status & IPS_NAT_MASK) { 713 /* NAT needed */ 714 ret = nat_h245(skb, ct, ctinfo, protoff, data, dataoff, taddr, 715 port, exp); 716 } else { /* Conntrack only */ 717 if (nf_ct_expect_related(exp) == 0) { 718 pr_debug("nf_ct_q931: expect H.245 "); 719 nf_ct_dump_tuple(&exp->tuple); 720 } else 721 ret = -1; 722 } 723 724 nf_ct_expect_put(exp); 725 726 return ret; 727} 728 729/* If the calling party is on the same side of the forward-to party, 730 * we don't need to track the second call */ 731static int callforward_do_filter(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_slow() */ 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(&init_net, (struct dst_entry **)&rt1, 754 flowi4_to_flowi(&fl1), false)) { 755 if (!afinfo->route(&init_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(&init_net, (struct dst_entry **)&rt1, 778 flowi6_to_flowi(&fl1), false)) { 779 if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, 780 flowi6_to_flowi(&fl2), false)) { 781 if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, 782 sizeof(rt1->rt6i_gateway)) && 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/****************************************************************************/ 798static 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 typeof(nat_callforwarding_hook) nat_callforwarding; 811 812 /* Read alternativeAddress */ 813 if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) 814 return 0; 815 816 /* If the calling party is on the same side of the forward-to party, 817 * we don't need to track the second call */ 818 if (callforward_filter && 819 callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, 820 nf_ct_l3num(ct))) { 821 pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); 822 return 0; 823 } 824 825 /* Create expect for the second call leg */ 826 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 827 return -1; 828 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 829 &ct->tuplehash[!dir].tuple.src.u3, &addr, 830 IPPROTO_TCP, NULL, &port); 831 exp->helper = nf_conntrack_helper_q931; 832 833 if (memcmp(&ct->tuplehash[dir].tuple.src.u3, 834 &ct->tuplehash[!dir].tuple.dst.u3, 835 sizeof(ct->tuplehash[dir].tuple.src.u3)) && 836 (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && 837 nf_ct_l3num(ct) == NFPROTO_IPV4 && 838 ct->status & IPS_NAT_MASK) { 839 /* Need NAT */ 840 ret = nat_callforwarding(skb, ct, ctinfo, 841 protoff, data, dataoff, 842 taddr, port, exp); 843 } else { /* Conntrack only */ 844 if (nf_ct_expect_related(exp) == 0) { 845 pr_debug("nf_ct_q931: expect Call Forwarding "); 846 nf_ct_dump_tuple(&exp->tuple); 847 } else 848 ret = -1; 849 } 850 851 nf_ct_expect_put(exp); 852 853 return ret; 854} 855 856/****************************************************************************/ 857static int process_setup(struct sk_buff *skb, struct nf_conn *ct, 858 enum ip_conntrack_info ctinfo, 859 unsigned int protoff, 860 unsigned char **data, int dataoff, 861 Setup_UUIE *setup) 862{ 863 int dir = CTINFO2DIR(ctinfo); 864 int ret; 865 int i; 866 __be16 port; 867 union nf_inet_addr addr; 868 typeof(set_h225_addr_hook) set_h225_addr; 869 870 pr_debug("nf_ct_q931: Setup\n"); 871 872 if (setup->options & eSetup_UUIE_h245Address) { 873 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 874 &setup->h245Address); 875 if (ret < 0) 876 return -1; 877 } 878 879 set_h225_addr = rcu_dereference(set_h225_addr_hook); 880 if ((setup->options & eSetup_UUIE_destCallSignalAddress) && 881 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && 882 ct->status & IPS_NAT_MASK && 883 get_h225_addr(ct, *data, &setup->destCallSignalAddress, 884 &addr, &port) && 885 memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { 886 pr_debug("nf_ct_q931: set destCallSignalAddress %pI6:%hu->%pI6:%hu\n", 887 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.src.u3, 888 ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); 889 ret = set_h225_addr(skb, protoff, data, dataoff, 890 &setup->destCallSignalAddress, 891 &ct->tuplehash[!dir].tuple.src.u3, 892 ct->tuplehash[!dir].tuple.src.u.tcp.port); 893 if (ret < 0) 894 return -1; 895 } 896 897 if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && 898 (set_h225_addr) && nf_ct_l3num(ct) == NFPROTO_IPV4 && 899 ct->status & IPS_NAT_MASK && 900 get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, 901 &addr, &port) && 902 memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { 903 pr_debug("nf_ct_q931: set sourceCallSignalAddress %pI6:%hu->%pI6:%hu\n", 904 &addr, ntohs(port), &ct->tuplehash[!dir].tuple.dst.u3, 905 ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); 906 ret = set_h225_addr(skb, protoff, data, dataoff, 907 &setup->sourceCallSignalAddress, 908 &ct->tuplehash[!dir].tuple.dst.u3, 909 ct->tuplehash[!dir].tuple.dst.u.tcp.port); 910 if (ret < 0) 911 return -1; 912 } 913 914 if (setup->options & eSetup_UUIE_fastStart) { 915 for (i = 0; i < setup->fastStart.count; i++) { 916 ret = process_olc(skb, ct, ctinfo, 917 protoff, data, dataoff, 918 &setup->fastStart.item[i]); 919 if (ret < 0) 920 return -1; 921 } 922 } 923 924 return 0; 925} 926 927/****************************************************************************/ 928static int process_callproceeding(struct sk_buff *skb, 929 struct nf_conn *ct, 930 enum ip_conntrack_info ctinfo, 931 unsigned int protoff, 932 unsigned char **data, int dataoff, 933 CallProceeding_UUIE *callproc) 934{ 935 int ret; 936 int i; 937 938 pr_debug("nf_ct_q931: CallProceeding\n"); 939 940 if (callproc->options & eCallProceeding_UUIE_h245Address) { 941 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 942 &callproc->h245Address); 943 if (ret < 0) 944 return -1; 945 } 946 947 if (callproc->options & eCallProceeding_UUIE_fastStart) { 948 for (i = 0; i < callproc->fastStart.count; i++) { 949 ret = process_olc(skb, ct, ctinfo, 950 protoff, data, dataoff, 951 &callproc->fastStart.item[i]); 952 if (ret < 0) 953 return -1; 954 } 955 } 956 957 return 0; 958} 959 960/****************************************************************************/ 961static int process_connect(struct sk_buff *skb, struct nf_conn *ct, 962 enum ip_conntrack_info ctinfo, 963 unsigned int protoff, 964 unsigned char **data, int dataoff, 965 Connect_UUIE *connect) 966{ 967 int ret; 968 int i; 969 970 pr_debug("nf_ct_q931: Connect\n"); 971 972 if (connect->options & eConnect_UUIE_h245Address) { 973 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 974 &connect->h245Address); 975 if (ret < 0) 976 return -1; 977 } 978 979 if (connect->options & eConnect_UUIE_fastStart) { 980 for (i = 0; i < connect->fastStart.count; i++) { 981 ret = process_olc(skb, ct, ctinfo, 982 protoff, data, dataoff, 983 &connect->fastStart.item[i]); 984 if (ret < 0) 985 return -1; 986 } 987 } 988 989 return 0; 990} 991 992/****************************************************************************/ 993static int process_alerting(struct sk_buff *skb, struct nf_conn *ct, 994 enum ip_conntrack_info ctinfo, 995 unsigned int protoff, 996 unsigned char **data, int dataoff, 997 Alerting_UUIE *alert) 998{ 999 int ret; 1000 int i; 1001 1002 pr_debug("nf_ct_q931: Alerting\n"); 1003 1004 if (alert->options & eAlerting_UUIE_h245Address) { 1005 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 1006 &alert->h245Address); 1007 if (ret < 0) 1008 return -1; 1009 } 1010 1011 if (alert->options & eAlerting_UUIE_fastStart) { 1012 for (i = 0; i < alert->fastStart.count; i++) { 1013 ret = process_olc(skb, ct, ctinfo, 1014 protoff, data, dataoff, 1015 &alert->fastStart.item[i]); 1016 if (ret < 0) 1017 return -1; 1018 } 1019 } 1020 1021 return 0; 1022} 1023 1024/****************************************************************************/ 1025static int process_facility(struct sk_buff *skb, struct nf_conn *ct, 1026 enum ip_conntrack_info ctinfo, 1027 unsigned int protoff, 1028 unsigned char **data, int dataoff, 1029 Facility_UUIE *facility) 1030{ 1031 int ret; 1032 int i; 1033 1034 pr_debug("nf_ct_q931: Facility\n"); 1035 1036 if (facility->reason.choice == eFacilityReason_callForwarded) { 1037 if (facility->options & eFacility_UUIE_alternativeAddress) 1038 return expect_callforwarding(skb, ct, ctinfo, 1039 protoff, data, dataoff, 1040 &facility-> 1041 alternativeAddress); 1042 return 0; 1043 } 1044 1045 if (facility->options & eFacility_UUIE_h245Address) { 1046 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 1047 &facility->h245Address); 1048 if (ret < 0) 1049 return -1; 1050 } 1051 1052 if (facility->options & eFacility_UUIE_fastStart) { 1053 for (i = 0; i < facility->fastStart.count; i++) { 1054 ret = process_olc(skb, ct, ctinfo, 1055 protoff, data, dataoff, 1056 &facility->fastStart.item[i]); 1057 if (ret < 0) 1058 return -1; 1059 } 1060 } 1061 1062 return 0; 1063} 1064 1065/****************************************************************************/ 1066static int process_progress(struct sk_buff *skb, struct nf_conn *ct, 1067 enum ip_conntrack_info ctinfo, 1068 unsigned int protoff, 1069 unsigned char **data, int dataoff, 1070 Progress_UUIE *progress) 1071{ 1072 int ret; 1073 int i; 1074 1075 pr_debug("nf_ct_q931: Progress\n"); 1076 1077 if (progress->options & eProgress_UUIE_h245Address) { 1078 ret = expect_h245(skb, ct, ctinfo, protoff, data, dataoff, 1079 &progress->h245Address); 1080 if (ret < 0) 1081 return -1; 1082 } 1083 1084 if (progress->options & eProgress_UUIE_fastStart) { 1085 for (i = 0; i < progress->fastStart.count; i++) { 1086 ret = process_olc(skb, ct, ctinfo, 1087 protoff, data, dataoff, 1088 &progress->fastStart.item[i]); 1089 if (ret < 0) 1090 return -1; 1091 } 1092 } 1093 1094 return 0; 1095} 1096 1097/****************************************************************************/ 1098static int process_q931(struct sk_buff *skb, struct nf_conn *ct, 1099 enum ip_conntrack_info ctinfo, 1100 unsigned int protoff, unsigned char **data, int dataoff, 1101 Q931 *q931) 1102{ 1103 H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; 1104 int i; 1105 int ret = 0; 1106 1107 switch (pdu->h323_message_body.choice) { 1108 case eH323_UU_PDU_h323_message_body_setup: 1109 ret = process_setup(skb, ct, ctinfo, protoff, data, dataoff, 1110 &pdu->h323_message_body.setup); 1111 break; 1112 case eH323_UU_PDU_h323_message_body_callProceeding: 1113 ret = process_callproceeding(skb, ct, ctinfo, 1114 protoff, data, dataoff, 1115 &pdu->h323_message_body. 1116 callProceeding); 1117 break; 1118 case eH323_UU_PDU_h323_message_body_connect: 1119 ret = process_connect(skb, ct, ctinfo, protoff, data, dataoff, 1120 &pdu->h323_message_body.connect); 1121 break; 1122 case eH323_UU_PDU_h323_message_body_alerting: 1123 ret = process_alerting(skb, ct, ctinfo, protoff, data, dataoff, 1124 &pdu->h323_message_body.alerting); 1125 break; 1126 case eH323_UU_PDU_h323_message_body_facility: 1127 ret = process_facility(skb, ct, ctinfo, protoff, data, dataoff, 1128 &pdu->h323_message_body.facility); 1129 break; 1130 case eH323_UU_PDU_h323_message_body_progress: 1131 ret = process_progress(skb, ct, ctinfo, protoff, data, dataoff, 1132 &pdu->h323_message_body.progress); 1133 break; 1134 default: 1135 pr_debug("nf_ct_q931: Q.931 signal %d\n", 1136 pdu->h323_message_body.choice); 1137 break; 1138 } 1139 1140 if (ret < 0) 1141 return -1; 1142 1143 if (pdu->options & eH323_UU_PDU_h245Control) { 1144 for (i = 0; i < pdu->h245Control.count; i++) { 1145 ret = process_h245(skb, ct, ctinfo, 1146 protoff, data, dataoff, 1147 &pdu->h245Control.item[i]); 1148 if (ret < 0) 1149 return -1; 1150 } 1151 } 1152 1153 return 0; 1154} 1155 1156/****************************************************************************/ 1157static int q931_help(struct sk_buff *skb, unsigned int protoff, 1158 struct nf_conn *ct, enum ip_conntrack_info ctinfo) 1159{ 1160 static Q931 q931; 1161 unsigned char *data = NULL; 1162 int datalen; 1163 int dataoff; 1164 int ret; 1165 1166 /* Until there's been traffic both ways, don't look in packets. */ 1167 if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) 1168 return NF_ACCEPT; 1169 1170 pr_debug("nf_ct_q931: skblen = %u\n", skb->len); 1171 1172 spin_lock_bh(&nf_h323_lock); 1173 1174 /* Process each TPKT */ 1175 while (get_tpkt_data(skb, protoff, ct, ctinfo, 1176 &data, &datalen, &dataoff)) { 1177 pr_debug("nf_ct_q931: TPKT len=%d ", datalen); 1178 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); 1179 1180 /* Decode Q.931 signal */ 1181 ret = DecodeQ931(data, datalen, &q931); 1182 if (ret < 0) { 1183 pr_debug("nf_ct_q931: decoding error: %s\n", 1184 ret == H323_ERROR_BOUND ? 1185 "out of bound" : "out of range"); 1186 /* We don't drop when decoding error */ 1187 break; 1188 } 1189 1190 /* Process Q.931 signal */ 1191 if (process_q931(skb, ct, ctinfo, protoff, 1192 &data, dataoff, &q931) < 0) 1193 goto drop; 1194 } 1195 1196 spin_unlock_bh(&nf_h323_lock); 1197 return NF_ACCEPT; 1198 1199 drop: 1200 spin_unlock_bh(&nf_h323_lock); 1201 nf_ct_helper_log(skb, ct, "cannot process Q.931 message"); 1202 return NF_DROP; 1203} 1204 1205/****************************************************************************/ 1206static const struct nf_conntrack_expect_policy q931_exp_policy = { 1207 /* T.120 and H.245 */ 1208 .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, 1209 .timeout = 240, 1210}; 1211 1212static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { 1213 { 1214 .name = "Q.931", 1215 .me = THIS_MODULE, 1216 .data_len = sizeof(struct nf_ct_h323_master), 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/****************************************************************************/ 1235static 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/****************************************************************************/ 1253static 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/****************************************************************************/ 1274static int set_expect_timeout(struct nf_conntrack_expect *exp, 1275 unsigned int timeout) 1276{ 1277 if (!exp || !del_timer(&exp->timeout)) 1278 return 0; 1279 1280 exp->timeout.expires = jiffies + timeout * HZ; 1281 add_timer(&exp->timeout); 1282 1283 return 1; 1284} 1285 1286/****************************************************************************/ 1287static int expect_q931(struct sk_buff *skb, struct nf_conn *ct, 1288 enum ip_conntrack_info ctinfo, 1289 unsigned int protoff, unsigned char **data, 1290 TransportAddress *taddr, int count) 1291{ 1292 struct nf_ct_h323_master *info = nfct_help_data(ct); 1293 int dir = CTINFO2DIR(ctinfo); 1294 int ret = 0; 1295 int i; 1296 __be16 port; 1297 union nf_inet_addr addr; 1298 struct nf_conntrack_expect *exp; 1299 typeof(nat_q931_hook) nat_q931; 1300 1301 /* Look for the first related address */ 1302 for (i = 0; i < count; i++) { 1303 if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && 1304 memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, 1305 sizeof(addr)) == 0 && port != 0) 1306 break; 1307 } 1308 1309 if (i >= count) /* Not found */ 1310 return 0; 1311 1312 /* Create expect for Q.931 */ 1313 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 1314 return -1; 1315 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 1316 gkrouted_only ? /* only accept calls from GK? */ 1317 &ct->tuplehash[!dir].tuple.src.u3 : NULL, 1318 &ct->tuplehash[!dir].tuple.dst.u3, 1319 IPPROTO_TCP, NULL, &port); 1320 exp->helper = nf_conntrack_helper_q931; 1321 exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ 1322 1323 nat_q931 = rcu_dereference(nat_q931_hook); 1324 if (nat_q931 && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1325 ct->status & IPS_NAT_MASK) { /* Need NAT */ 1326 ret = nat_q931(skb, ct, ctinfo, protoff, data, 1327 taddr, i, port, exp); 1328 } else { /* Conntrack only */ 1329 if (nf_ct_expect_related(exp) == 0) { 1330 pr_debug("nf_ct_ras: expect Q.931 "); 1331 nf_ct_dump_tuple(&exp->tuple); 1332 1333 /* Save port for looking up expect in processing RCF */ 1334 info->sig_port[dir] = port; 1335 } else 1336 ret = -1; 1337 } 1338 1339 nf_ct_expect_put(exp); 1340 1341 return ret; 1342} 1343 1344/****************************************************************************/ 1345static int process_grq(struct sk_buff *skb, struct nf_conn *ct, 1346 enum ip_conntrack_info ctinfo, 1347 unsigned int protoff, 1348 unsigned char **data, GatekeeperRequest *grq) 1349{ 1350 typeof(set_ras_addr_hook) set_ras_addr; 1351 1352 pr_debug("nf_ct_ras: GRQ\n"); 1353 1354 set_ras_addr = rcu_dereference(set_ras_addr_hook); 1355 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1356 ct->status & IPS_NAT_MASK) /* NATed */ 1357 return set_ras_addr(skb, ct, ctinfo, protoff, data, 1358 &grq->rasAddress, 1); 1359 return 0; 1360} 1361 1362/****************************************************************************/ 1363static int process_gcf(struct sk_buff *skb, struct nf_conn *ct, 1364 enum ip_conntrack_info ctinfo, 1365 unsigned int protoff, 1366 unsigned char **data, GatekeeperConfirm *gcf) 1367{ 1368 int dir = CTINFO2DIR(ctinfo); 1369 int ret = 0; 1370 __be16 port; 1371 union nf_inet_addr addr; 1372 struct nf_conntrack_expect *exp; 1373 1374 pr_debug("nf_ct_ras: GCF\n"); 1375 1376 if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) 1377 return 0; 1378 1379 /* Registration port is the same as discovery port */ 1380 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && 1381 port == ct->tuplehash[dir].tuple.src.u.udp.port) 1382 return 0; 1383 1384 /* Avoid RAS expectation loops. A GCF is never expected. */ 1385 if (test_bit(IPS_EXPECTED_BIT, &ct->status)) 1386 return 0; 1387 1388 /* Need new expect */ 1389 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 1390 return -1; 1391 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 1392 &ct->tuplehash[!dir].tuple.src.u3, &addr, 1393 IPPROTO_UDP, NULL, &port); 1394 exp->helper = nf_conntrack_helper_ras; 1395 1396 if (nf_ct_expect_related(exp) == 0) { 1397 pr_debug("nf_ct_ras: expect RAS "); 1398 nf_ct_dump_tuple(&exp->tuple); 1399 } else 1400 ret = -1; 1401 1402 nf_ct_expect_put(exp); 1403 1404 return ret; 1405} 1406 1407/****************************************************************************/ 1408static int process_rrq(struct sk_buff *skb, struct nf_conn *ct, 1409 enum ip_conntrack_info ctinfo, 1410 unsigned int protoff, 1411 unsigned char **data, RegistrationRequest *rrq) 1412{ 1413 struct nf_ct_h323_master *info = nfct_help_data(ct); 1414 int ret; 1415 typeof(set_ras_addr_hook) set_ras_addr; 1416 1417 pr_debug("nf_ct_ras: RRQ\n"); 1418 1419 ret = expect_q931(skb, ct, ctinfo, protoff, data, 1420 rrq->callSignalAddress.item, 1421 rrq->callSignalAddress.count); 1422 if (ret < 0) 1423 return -1; 1424 1425 set_ras_addr = rcu_dereference(set_ras_addr_hook); 1426 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1427 ct->status & IPS_NAT_MASK) { 1428 ret = set_ras_addr(skb, ct, ctinfo, protoff, data, 1429 rrq->rasAddress.item, 1430 rrq->rasAddress.count); 1431 if (ret < 0) 1432 return -1; 1433 } 1434 1435 if (rrq->options & eRegistrationRequest_timeToLive) { 1436 pr_debug("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); 1437 info->timeout = rrq->timeToLive; 1438 } else 1439 info->timeout = default_rrq_ttl; 1440 1441 return 0; 1442} 1443 1444/****************************************************************************/ 1445static int process_rcf(struct sk_buff *skb, struct nf_conn *ct, 1446 enum ip_conntrack_info ctinfo, 1447 unsigned int protoff, 1448 unsigned char **data, RegistrationConfirm *rcf) 1449{ 1450 struct nf_ct_h323_master *info = nfct_help_data(ct); 1451 int dir = CTINFO2DIR(ctinfo); 1452 int ret; 1453 struct nf_conntrack_expect *exp; 1454 typeof(set_sig_addr_hook) set_sig_addr; 1455 1456 pr_debug("nf_ct_ras: RCF\n"); 1457 1458 set_sig_addr = rcu_dereference(set_sig_addr_hook); 1459 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1460 ct->status & IPS_NAT_MASK) { 1461 ret = set_sig_addr(skb, ct, ctinfo, protoff, data, 1462 rcf->callSignalAddress.item, 1463 rcf->callSignalAddress.count); 1464 if (ret < 0) 1465 return -1; 1466 } 1467 1468 if (rcf->options & eRegistrationConfirm_timeToLive) { 1469 pr_debug("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); 1470 info->timeout = rcf->timeToLive; 1471 } 1472 1473 if (info->timeout > 0) { 1474 pr_debug("nf_ct_ras: set RAS connection timeout to " 1475 "%u seconds\n", info->timeout); 1476 nf_ct_refresh(ct, skb, info->timeout * HZ); 1477 1478 /* Set expect timeout */ 1479 spin_lock_bh(&nf_conntrack_lock); 1480 exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, 1481 info->sig_port[!dir]); 1482 if (exp) { 1483 pr_debug("nf_ct_ras: set Q.931 expect " 1484 "timeout to %u seconds for", 1485 info->timeout); 1486 nf_ct_dump_tuple(&exp->tuple); 1487 set_expect_timeout(exp, info->timeout); 1488 } 1489 spin_unlock_bh(&nf_conntrack_lock); 1490 } 1491 1492 return 0; 1493} 1494 1495/****************************************************************************/ 1496static int process_urq(struct sk_buff *skb, struct nf_conn *ct, 1497 enum ip_conntrack_info ctinfo, 1498 unsigned int protoff, 1499 unsigned char **data, UnregistrationRequest *urq) 1500{ 1501 struct nf_ct_h323_master *info = nfct_help_data(ct); 1502 int dir = CTINFO2DIR(ctinfo); 1503 int ret; 1504 typeof(set_sig_addr_hook) set_sig_addr; 1505 1506 pr_debug("nf_ct_ras: URQ\n"); 1507 1508 set_sig_addr = rcu_dereference(set_sig_addr_hook); 1509 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1510 ct->status & IPS_NAT_MASK) { 1511 ret = set_sig_addr(skb, ct, ctinfo, protoff, data, 1512 urq->callSignalAddress.item, 1513 urq->callSignalAddress.count); 1514 if (ret < 0) 1515 return -1; 1516 } 1517 1518 /* Clear old expect */ 1519 nf_ct_remove_expectations(ct); 1520 info->sig_port[dir] = 0; 1521 info->sig_port[!dir] = 0; 1522 1523 /* Give it 30 seconds for UCF or URJ */ 1524 nf_ct_refresh(ct, skb, 30 * HZ); 1525 1526 return 0; 1527} 1528 1529/****************************************************************************/ 1530static int process_arq(struct sk_buff *skb, struct nf_conn *ct, 1531 enum ip_conntrack_info ctinfo, 1532 unsigned int protoff, 1533 unsigned char **data, AdmissionRequest *arq) 1534{ 1535 const struct nf_ct_h323_master *info = nfct_help_data(ct); 1536 int dir = CTINFO2DIR(ctinfo); 1537 __be16 port; 1538 union nf_inet_addr addr; 1539 typeof(set_h225_addr_hook) set_h225_addr; 1540 1541 pr_debug("nf_ct_ras: ARQ\n"); 1542 1543 set_h225_addr = rcu_dereference(set_h225_addr_hook); 1544 if ((arq->options & eAdmissionRequest_destCallSignalAddress) && 1545 get_h225_addr(ct, *data, &arq->destCallSignalAddress, 1546 &addr, &port) && 1547 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && 1548 port == info->sig_port[dir] && 1549 nf_ct_l3num(ct) == NFPROTO_IPV4 && 1550 set_h225_addr && ct->status & IPS_NAT_MASK) { 1551 /* Answering ARQ */ 1552 return set_h225_addr(skb, protoff, data, 0, 1553 &arq->destCallSignalAddress, 1554 &ct->tuplehash[!dir].tuple.dst.u3, 1555 info->sig_port[!dir]); 1556 } 1557 1558 if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && 1559 get_h225_addr(ct, *data, &arq->srcCallSignalAddress, 1560 &addr, &port) && 1561 !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && 1562 set_h225_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1563 ct->status & IPS_NAT_MASK) { 1564 /* Calling ARQ */ 1565 return set_h225_addr(skb, protoff, data, 0, 1566 &arq->srcCallSignalAddress, 1567 &ct->tuplehash[!dir].tuple.dst.u3, 1568 port); 1569 } 1570 1571 return 0; 1572} 1573 1574/****************************************************************************/ 1575static int process_acf(struct sk_buff *skb, struct nf_conn *ct, 1576 enum ip_conntrack_info ctinfo, 1577 unsigned int protoff, 1578 unsigned char **data, AdmissionConfirm *acf) 1579{ 1580 int dir = CTINFO2DIR(ctinfo); 1581 int ret = 0; 1582 __be16 port; 1583 union nf_inet_addr addr; 1584 struct nf_conntrack_expect *exp; 1585 typeof(set_sig_addr_hook) set_sig_addr; 1586 1587 pr_debug("nf_ct_ras: ACF\n"); 1588 1589 if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, 1590 &addr, &port)) 1591 return 0; 1592 1593 if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { 1594 /* Answering ACF */ 1595 set_sig_addr = rcu_dereference(set_sig_addr_hook); 1596 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1597 ct->status & IPS_NAT_MASK) 1598 return set_sig_addr(skb, ct, ctinfo, protoff, data, 1599 &acf->destCallSignalAddress, 1); 1600 return 0; 1601 } 1602 1603 /* Need new expect */ 1604 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 1605 return -1; 1606 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 1607 &ct->tuplehash[!dir].tuple.src.u3, &addr, 1608 IPPROTO_TCP, NULL, &port); 1609 exp->flags = NF_CT_EXPECT_PERMANENT; 1610 exp->helper = nf_conntrack_helper_q931; 1611 1612 if (nf_ct_expect_related(exp) == 0) { 1613 pr_debug("nf_ct_ras: expect Q.931 "); 1614 nf_ct_dump_tuple(&exp->tuple); 1615 } else 1616 ret = -1; 1617 1618 nf_ct_expect_put(exp); 1619 1620 return ret; 1621} 1622 1623/****************************************************************************/ 1624static int process_lrq(struct sk_buff *skb, struct nf_conn *ct, 1625 enum ip_conntrack_info ctinfo, 1626 unsigned int protoff, 1627 unsigned char **data, LocationRequest *lrq) 1628{ 1629 typeof(set_ras_addr_hook) set_ras_addr; 1630 1631 pr_debug("nf_ct_ras: LRQ\n"); 1632 1633 set_ras_addr = rcu_dereference(set_ras_addr_hook); 1634 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1635 ct->status & IPS_NAT_MASK) 1636 return set_ras_addr(skb, ct, ctinfo, protoff, data, 1637 &lrq->replyAddress, 1); 1638 return 0; 1639} 1640 1641/****************************************************************************/ 1642static int process_lcf(struct sk_buff *skb, struct nf_conn *ct, 1643 enum ip_conntrack_info ctinfo, 1644 unsigned int protoff, 1645 unsigned char **data, LocationConfirm *lcf) 1646{ 1647 int dir = CTINFO2DIR(ctinfo); 1648 int ret = 0; 1649 __be16 port; 1650 union nf_inet_addr addr; 1651 struct nf_conntrack_expect *exp; 1652 1653 pr_debug("nf_ct_ras: LCF\n"); 1654 1655 if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, 1656 &addr, &port)) 1657 return 0; 1658 1659 /* Need new expect for call signal */ 1660 if ((exp = nf_ct_expect_alloc(ct)) == NULL) 1661 return -1; 1662 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, nf_ct_l3num(ct), 1663 &ct->tuplehash[!dir].tuple.src.u3, &addr, 1664 IPPROTO_TCP, NULL, &port); 1665 exp->flags = NF_CT_EXPECT_PERMANENT; 1666 exp->helper = nf_conntrack_helper_q931; 1667 1668 if (nf_ct_expect_related(exp) == 0) { 1669 pr_debug("nf_ct_ras: expect Q.931 "); 1670 nf_ct_dump_tuple(&exp->tuple); 1671 } else 1672 ret = -1; 1673 1674 nf_ct_expect_put(exp); 1675 1676 /* Ignore rasAddress */ 1677 1678 return ret; 1679} 1680 1681/****************************************************************************/ 1682static int process_irr(struct sk_buff *skb, struct nf_conn *ct, 1683 enum ip_conntrack_info ctinfo, 1684 unsigned int protoff, 1685 unsigned char **data, InfoRequestResponse *irr) 1686{ 1687 int ret; 1688 typeof(set_ras_addr_hook) set_ras_addr; 1689 typeof(set_sig_addr_hook) set_sig_addr; 1690 1691 pr_debug("nf_ct_ras: IRR\n"); 1692 1693 set_ras_addr = rcu_dereference(set_ras_addr_hook); 1694 if (set_ras_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1695 ct->status & IPS_NAT_MASK) { 1696 ret = set_ras_addr(skb, ct, ctinfo, protoff, data, 1697 &irr->rasAddress, 1); 1698 if (ret < 0) 1699 return -1; 1700 } 1701 1702 set_sig_addr = rcu_dereference(set_sig_addr_hook); 1703 if (set_sig_addr && nf_ct_l3num(ct) == NFPROTO_IPV4 && 1704 ct->status & IPS_NAT_MASK) { 1705 ret = set_sig_addr(skb, ct, ctinfo, protoff, data, 1706 irr->callSignalAddress.item, 1707 irr->callSignalAddress.count); 1708 if (ret < 0) 1709 return -1; 1710 } 1711 1712 return 0; 1713} 1714 1715/****************************************************************************/ 1716static int process_ras(struct sk_buff *skb, struct nf_conn *ct, 1717 enum ip_conntrack_info ctinfo, 1718 unsigned int protoff, 1719 unsigned char **data, RasMessage *ras) 1720{ 1721 switch (ras->choice) { 1722 case eRasMessage_gatekeeperRequest: 1723 return process_grq(skb, ct, ctinfo, protoff, data, 1724 &ras->gatekeeperRequest); 1725 case eRasMessage_gatekeeperConfirm: 1726 return process_gcf(skb, ct, ctinfo, protoff, data, 1727 &ras->gatekeeperConfirm); 1728 case eRasMessage_registrationRequest: 1729 return process_rrq(skb, ct, ctinfo, protoff, data, 1730 &ras->registrationRequest); 1731 case eRasMessage_registrationConfirm: 1732 return process_rcf(skb, ct, ctinfo, protoff, data, 1733 &ras->registrationConfirm); 1734 case eRasMessage_unregistrationRequest: 1735 return process_urq(skb, ct, ctinfo, protoff, data, 1736 &ras->unregistrationRequest); 1737 case eRasMessage_admissionRequest: 1738 return process_arq(skb, ct, ctinfo, protoff, data, 1739 &ras->admissionRequest); 1740 case eRasMessage_admissionConfirm: 1741 return process_acf(skb, ct, ctinfo, protoff, data, 1742 &ras->admissionConfirm); 1743 case eRasMessage_locationRequest: 1744 return process_lrq(skb, ct, ctinfo, protoff, data, 1745 &ras->locationRequest); 1746 case eRasMessage_locationConfirm: 1747 return process_lcf(skb, ct, ctinfo, protoff, data, 1748 &ras->locationConfirm); 1749 case eRasMessage_infoRequestResponse: 1750 return process_irr(skb, ct, ctinfo, protoff, data, 1751 &ras->infoRequestResponse); 1752 default: 1753 pr_debug("nf_ct_ras: RAS message %d\n", ras->choice); 1754 break; 1755 } 1756 1757 return 0; 1758} 1759 1760/****************************************************************************/ 1761static int ras_help(struct sk_buff *skb, unsigned int protoff, 1762 struct nf_conn *ct, enum ip_conntrack_info ctinfo) 1763{ 1764 static RasMessage ras; 1765 unsigned char *data; 1766 int datalen = 0; 1767 int ret; 1768 1769 pr_debug("nf_ct_ras: skblen = %u\n", skb->len); 1770 1771 spin_lock_bh(&nf_h323_lock); 1772 1773 /* Get UDP data */ 1774 data = get_udp_data(skb, protoff, &datalen); 1775 if (data == NULL) 1776 goto accept; 1777 pr_debug("nf_ct_ras: RAS message len=%d ", datalen); 1778 nf_ct_dump_tuple(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); 1779 1780 /* Decode RAS message */ 1781 ret = DecodeRasMessage(data, datalen, &ras); 1782 if (ret < 0) { 1783 pr_debug("nf_ct_ras: decoding error: %s\n", 1784 ret == H323_ERROR_BOUND ? 1785 "out of bound" : "out of range"); 1786 goto accept; 1787 } 1788 1789 /* Process RAS message */ 1790 if (process_ras(skb, ct, ctinfo, protoff, &data, &ras) < 0) 1791 goto drop; 1792 1793 accept: 1794 spin_unlock_bh(&nf_h323_lock); 1795 return NF_ACCEPT; 1796 1797 drop: 1798 spin_unlock_bh(&nf_h323_lock); 1799 nf_ct_helper_log(skb, ct, "cannot process RAS message"); 1800 return NF_DROP; 1801} 1802 1803/****************************************************************************/ 1804static const struct nf_conntrack_expect_policy ras_exp_policy = { 1805 .max_expected = 32, 1806 .timeout = 240, 1807}; 1808 1809static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { 1810 { 1811 .name = "RAS", 1812 .me = THIS_MODULE, 1813 .data_len = sizeof(struct nf_ct_h323_master), 1814 .tuple.src.l3num = AF_INET, 1815 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), 1816 .tuple.dst.protonum = IPPROTO_UDP, 1817 .help = ras_help, 1818 .expect_policy = &ras_exp_policy, 1819 }, 1820 { 1821 .name = "RAS", 1822 .me = THIS_MODULE, 1823 .data_len = sizeof(struct nf_ct_h323_master), 1824 .tuple.src.l3num = AF_INET6, 1825 .tuple.src.u.udp.port = cpu_to_be16(RAS_PORT), 1826 .tuple.dst.protonum = IPPROTO_UDP, 1827 .help = ras_help, 1828 .expect_policy = &ras_exp_policy, 1829 }, 1830}; 1831 1832/****************************************************************************/ 1833static void __exit nf_conntrack_h323_fini(void) 1834{ 1835 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); 1836 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); 1837 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); 1838 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); 1839 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); 1840 kfree(h323_buffer); 1841 pr_debug("nf_ct_h323: fini\n"); 1842} 1843 1844/****************************************************************************/ 1845static int __init nf_conntrack_h323_init(void) 1846{ 1847 int ret; 1848 1849 h323_buffer = kmalloc(65536, GFP_KERNEL); 1850 if (!h323_buffer) 1851 return -ENOMEM; 1852 ret = nf_conntrack_helper_register(&nf_conntrack_helper_h245); 1853 if (ret < 0) 1854 goto err1; 1855 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); 1856 if (ret < 0) 1857 goto err2; 1858 ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); 1859 if (ret < 0) 1860 goto err3; 1861 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); 1862 if (ret < 0) 1863 goto err4; 1864 ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); 1865 if (ret < 0) 1866 goto err5; 1867 pr_debug("nf_ct_h323: init success\n"); 1868 return 0; 1869 1870err5: 1871 nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); 1872err4: 1873 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); 1874err3: 1875 nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); 1876err2: 1877 nf_conntrack_helper_unregister(&nf_conntrack_helper_h245); 1878err1: 1879 kfree(h323_buffer); 1880 return ret; 1881} 1882 1883/****************************************************************************/ 1884module_init(nf_conntrack_h323_init); 1885module_exit(nf_conntrack_h323_fini); 1886 1887EXPORT_SYMBOL_GPL(get_h225_addr); 1888EXPORT_SYMBOL_GPL(set_h245_addr_hook); 1889EXPORT_SYMBOL_GPL(set_h225_addr_hook); 1890EXPORT_SYMBOL_GPL(set_sig_addr_hook); 1891EXPORT_SYMBOL_GPL(set_ras_addr_hook); 1892EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); 1893EXPORT_SYMBOL_GPL(nat_t120_hook); 1894EXPORT_SYMBOL_GPL(nat_h245_hook); 1895EXPORT_SYMBOL_GPL(nat_callforwarding_hook); 1896EXPORT_SYMBOL_GPL(nat_q931_hook); 1897 1898MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); 1899MODULE_DESCRIPTION("H.323 connection tracking helper"); 1900MODULE_LICENSE("GPL"); 1901MODULE_ALIAS("ip_conntrack_h323"); 1902MODULE_ALIAS_NFCT_HELPER("RAS"); 1903MODULE_ALIAS_NFCT_HELPER("Q.931"); 1904MODULE_ALIAS_NFCT_HELPER("H.245"); 1905