Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * H.323 connection tracking helper |
| 3 | * |
| 4 | * Copyright (c) 2006 Jing Min Zhao <zhaojingmin@users.sourceforge.net> |
| 5 | * |
| 6 | * This source code is licensed under General Public License version 2. |
| 7 | * |
| 8 | * Based on the 'brute force' H.323 connection tracking module by |
| 9 | * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| 10 | * |
| 11 | * For more information, please see http://nath323.sourceforge.net/ |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/moduleparam.h> |
| 16 | #include <linux/ctype.h> |
| 17 | #include <linux/inet.h> |
| 18 | #include <linux/in.h> |
| 19 | #include <linux/ip.h> |
| 20 | #include <linux/udp.h> |
| 21 | #include <linux/tcp.h> |
| 22 | #include <linux/skbuff.h> |
| 23 | #include <net/route.h> |
| 24 | #include <net/ip6_route.h> |
| 25 | |
| 26 | #include <net/netfilter/nf_conntrack.h> |
| 27 | #include <net/netfilter/nf_conntrack_core.h> |
| 28 | #include <net/netfilter/nf_conntrack_tuple.h> |
| 29 | #include <net/netfilter/nf_conntrack_expect.h> |
| 30 | #include <net/netfilter/nf_conntrack_ecache.h> |
| 31 | #include <net/netfilter/nf_conntrack_helper.h> |
| 32 | #include <linux/netfilter/nf_conntrack_h323.h> |
| 33 | |
| 34 | #if 0 |
| 35 | #define DEBUGP printk |
| 36 | #else |
| 37 | #define DEBUGP(format, args...) |
| 38 | #endif |
| 39 | |
| 40 | /* Parameters */ |
| 41 | static unsigned int default_rrq_ttl __read_mostly = 300; |
| 42 | module_param(default_rrq_ttl, uint, 0600); |
| 43 | MODULE_PARM_DESC(default_rrq_ttl, "use this TTL if it's missing in RRQ"); |
| 44 | |
| 45 | static int gkrouted_only __read_mostly = 1; |
| 46 | module_param(gkrouted_only, int, 0600); |
| 47 | MODULE_PARM_DESC(gkrouted_only, "only accept calls from gatekeeper"); |
| 48 | |
| 49 | static int callforward_filter __read_mostly = 1; |
| 50 | module_param(callforward_filter, bool, 0600); |
| 51 | MODULE_PARM_DESC(callforward_filter, "only create call forwarding expectations " |
| 52 | "if both endpoints are on different sides " |
| 53 | "(determined by routing information)"); |
| 54 | |
| 55 | /* Hooks for NAT */ |
| 56 | int (*set_h245_addr_hook) (struct sk_buff **pskb, |
| 57 | unsigned char **data, int dataoff, |
| 58 | H245_TransportAddress *taddr, |
| 59 | union nf_conntrack_address *addr, __be16 port) |
| 60 | __read_mostly; |
| 61 | int (*set_h225_addr_hook) (struct sk_buff **pskb, |
| 62 | unsigned char **data, int dataoff, |
| 63 | TransportAddress *taddr, |
| 64 | union nf_conntrack_address *addr, __be16 port) |
| 65 | __read_mostly; |
| 66 | int (*set_sig_addr_hook) (struct sk_buff **pskb, |
| 67 | struct nf_conn *ct, |
| 68 | enum ip_conntrack_info ctinfo, |
| 69 | unsigned char **data, |
| 70 | TransportAddress *taddr, int count) __read_mostly; |
| 71 | int (*set_ras_addr_hook) (struct sk_buff **pskb, |
| 72 | struct nf_conn *ct, |
| 73 | enum ip_conntrack_info ctinfo, |
| 74 | unsigned char **data, |
| 75 | TransportAddress *taddr, int count) __read_mostly; |
| 76 | int (*nat_rtp_rtcp_hook) (struct sk_buff **pskb, |
| 77 | struct nf_conn *ct, |
| 78 | enum ip_conntrack_info ctinfo, |
| 79 | unsigned char **data, int dataoff, |
| 80 | H245_TransportAddress *taddr, |
| 81 | __be16 port, __be16 rtp_port, |
| 82 | struct nf_conntrack_expect *rtp_exp, |
| 83 | struct nf_conntrack_expect *rtcp_exp) __read_mostly; |
| 84 | int (*nat_t120_hook) (struct sk_buff **pskb, |
| 85 | struct nf_conn *ct, |
| 86 | enum ip_conntrack_info ctinfo, |
| 87 | unsigned char **data, int dataoff, |
| 88 | H245_TransportAddress *taddr, __be16 port, |
| 89 | struct nf_conntrack_expect *exp) __read_mostly; |
| 90 | int (*nat_h245_hook) (struct sk_buff **pskb, |
| 91 | struct nf_conn *ct, |
| 92 | enum ip_conntrack_info ctinfo, |
| 93 | unsigned char **data, int dataoff, |
| 94 | TransportAddress *taddr, __be16 port, |
| 95 | struct nf_conntrack_expect *exp) __read_mostly; |
| 96 | int (*nat_callforwarding_hook) (struct sk_buff **pskb, |
| 97 | struct nf_conn *ct, |
| 98 | enum ip_conntrack_info ctinfo, |
| 99 | unsigned char **data, int dataoff, |
| 100 | TransportAddress *taddr, __be16 port, |
| 101 | struct nf_conntrack_expect *exp) __read_mostly; |
| 102 | int (*nat_q931_hook) (struct sk_buff **pskb, |
| 103 | struct nf_conn *ct, |
| 104 | enum ip_conntrack_info ctinfo, |
| 105 | unsigned char **data, TransportAddress *taddr, int idx, |
| 106 | __be16 port, struct nf_conntrack_expect *exp) |
| 107 | __read_mostly; |
| 108 | |
| 109 | static DEFINE_SPINLOCK(nf_h323_lock); |
| 110 | static char *h323_buffer; |
| 111 | |
| 112 | static struct nf_conntrack_helper nf_conntrack_helper_h245; |
| 113 | static struct nf_conntrack_helper nf_conntrack_helper_q931[]; |
| 114 | static struct nf_conntrack_helper nf_conntrack_helper_ras[]; |
| 115 | |
| 116 | /****************************************************************************/ |
| 117 | static int get_tpkt_data(struct sk_buff **pskb, unsigned int protoff, |
| 118 | struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
| 119 | unsigned char **data, int *datalen, int *dataoff) |
| 120 | { |
| 121 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 122 | int dir = CTINFO2DIR(ctinfo); |
| 123 | struct tcphdr _tcph, *th; |
| 124 | int tcpdatalen; |
| 125 | int tcpdataoff; |
| 126 | unsigned char *tpkt; |
| 127 | int tpktlen; |
| 128 | int tpktoff; |
| 129 | |
| 130 | /* Get TCP header */ |
| 131 | th = skb_header_pointer(*pskb, protoff, sizeof(_tcph), &_tcph); |
| 132 | if (th == NULL) |
| 133 | return 0; |
| 134 | |
| 135 | /* Get TCP data offset */ |
| 136 | tcpdataoff = protoff + th->doff * 4; |
| 137 | |
| 138 | /* Get TCP data length */ |
| 139 | tcpdatalen = (*pskb)->len - tcpdataoff; |
| 140 | if (tcpdatalen <= 0) /* No TCP data */ |
| 141 | goto clear_out; |
| 142 | |
| 143 | if (*data == NULL) { /* first TPKT */ |
| 144 | /* Get first TPKT pointer */ |
| 145 | tpkt = skb_header_pointer(*pskb, tcpdataoff, tcpdatalen, |
| 146 | h323_buffer); |
| 147 | BUG_ON(tpkt == NULL); |
| 148 | |
| 149 | /* Validate TPKT identifier */ |
| 150 | if (tcpdatalen < 4 || tpkt[0] != 0x03 || tpkt[1] != 0) { |
| 151 | /* Netmeeting sends TPKT header and data separately */ |
| 152 | if (info->tpkt_len[dir] > 0) { |
| 153 | DEBUGP("nf_ct_h323: previous packet " |
| 154 | "indicated separate TPKT data of %hu " |
| 155 | "bytes\n", info->tpkt_len[dir]); |
| 156 | if (info->tpkt_len[dir] <= tcpdatalen) { |
| 157 | /* Yes, there was a TPKT header |
| 158 | * received */ |
| 159 | *data = tpkt; |
| 160 | *datalen = info->tpkt_len[dir]; |
| 161 | *dataoff = 0; |
| 162 | goto out; |
| 163 | } |
| 164 | |
| 165 | /* Fragmented TPKT */ |
| 166 | if (net_ratelimit()) |
| 167 | printk("nf_ct_h323: " |
| 168 | "fragmented TPKT\n"); |
| 169 | goto clear_out; |
| 170 | } |
| 171 | |
| 172 | /* It is not even a TPKT */ |
| 173 | return 0; |
| 174 | } |
| 175 | tpktoff = 0; |
| 176 | } else { /* Next TPKT */ |
| 177 | tpktoff = *dataoff + *datalen; |
| 178 | tcpdatalen -= tpktoff; |
| 179 | if (tcpdatalen <= 4) /* No more TPKT */ |
| 180 | goto clear_out; |
| 181 | tpkt = *data + *datalen; |
| 182 | |
| 183 | /* Validate TPKT identifier */ |
| 184 | if (tpkt[0] != 0x03 || tpkt[1] != 0) |
| 185 | goto clear_out; |
| 186 | } |
| 187 | |
| 188 | /* Validate TPKT length */ |
| 189 | tpktlen = tpkt[2] * 256 + tpkt[3]; |
| 190 | if (tpktlen < 4) |
| 191 | goto clear_out; |
| 192 | if (tpktlen > tcpdatalen) { |
| 193 | if (tcpdatalen == 4) { /* Separate TPKT header */ |
| 194 | /* Netmeeting sends TPKT header and data separately */ |
| 195 | DEBUGP("nf_ct_h323: separate TPKT header indicates " |
| 196 | "there will be TPKT data of %hu bytes\n", |
| 197 | tpktlen - 4); |
| 198 | info->tpkt_len[dir] = tpktlen - 4; |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | if (net_ratelimit()) |
| 203 | printk("nf_ct_h323: incomplete TPKT (fragmented?)\n"); |
| 204 | goto clear_out; |
| 205 | } |
| 206 | |
| 207 | /* This is the encapsulated data */ |
| 208 | *data = tpkt + 4; |
| 209 | *datalen = tpktlen - 4; |
| 210 | *dataoff = tpktoff + 4; |
| 211 | |
| 212 | out: |
| 213 | /* Clear TPKT length */ |
| 214 | info->tpkt_len[dir] = 0; |
| 215 | return 1; |
| 216 | |
| 217 | clear_out: |
| 218 | info->tpkt_len[dir] = 0; |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | /****************************************************************************/ |
| 223 | static int get_h245_addr(struct nf_conn *ct, unsigned char *data, |
| 224 | H245_TransportAddress *taddr, |
| 225 | union nf_conntrack_address *addr, __be16 *port) |
| 226 | { |
| 227 | unsigned char *p; |
| 228 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 229 | int len; |
| 230 | |
| 231 | if (taddr->choice != eH245_TransportAddress_unicastAddress) |
| 232 | return 0; |
| 233 | |
| 234 | switch (taddr->unicastAddress.choice) { |
| 235 | case eUnicastAddress_iPAddress: |
| 236 | if (family != AF_INET) |
| 237 | return 0; |
| 238 | p = data + taddr->unicastAddress.iPAddress.network; |
| 239 | len = 4; |
| 240 | break; |
| 241 | case eUnicastAddress_iP6Address: |
| 242 | if (family != AF_INET6) |
| 243 | return 0; |
| 244 | p = data + taddr->unicastAddress.iP6Address.network; |
| 245 | len = 16; |
| 246 | break; |
| 247 | default: |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | memcpy(addr, p, len); |
| 252 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
| 253 | memcpy(port, p + len, sizeof(__be16)); |
| 254 | |
| 255 | return 1; |
| 256 | } |
| 257 | |
| 258 | /****************************************************************************/ |
| 259 | static int expect_rtp_rtcp(struct sk_buff **pskb, struct nf_conn *ct, |
| 260 | enum ip_conntrack_info ctinfo, |
| 261 | unsigned char **data, int dataoff, |
| 262 | H245_TransportAddress *taddr) |
| 263 | { |
| 264 | int dir = CTINFO2DIR(ctinfo); |
| 265 | int ret = 0; |
| 266 | __be16 port; |
| 267 | __be16 rtp_port, rtcp_port; |
| 268 | union nf_conntrack_address addr; |
| 269 | struct nf_conntrack_expect *rtp_exp; |
| 270 | struct nf_conntrack_expect *rtcp_exp; |
| 271 | typeof(nat_rtp_rtcp_hook) nat_rtp_rtcp; |
| 272 | |
| 273 | /* Read RTP or RTCP address */ |
| 274 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
| 275 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 276 | port == 0) |
| 277 | return 0; |
| 278 | |
| 279 | /* RTP port is even */ |
| 280 | port &= htons(~1); |
| 281 | rtp_port = port; |
| 282 | rtcp_port = htons(ntohs(port) + 1); |
| 283 | |
| 284 | /* Create expect for RTP */ |
| 285 | if ((rtp_exp = nf_conntrack_expect_alloc(ct)) == NULL) |
| 286 | return -1; |
| 287 | nf_conntrack_expect_init(rtp_exp, ct->tuplehash[!dir].tuple.src.l3num, |
| 288 | &ct->tuplehash[!dir].tuple.src.u3, |
| 289 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 290 | IPPROTO_UDP, NULL, &rtp_port); |
| 291 | |
| 292 | /* Create expect for RTCP */ |
| 293 | if ((rtcp_exp = nf_conntrack_expect_alloc(ct)) == NULL) { |
| 294 | nf_conntrack_expect_put(rtp_exp); |
| 295 | return -1; |
| 296 | } |
| 297 | nf_conntrack_expect_init(rtcp_exp, ct->tuplehash[!dir].tuple.src.l3num, |
| 298 | &ct->tuplehash[!dir].tuple.src.u3, |
| 299 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 300 | IPPROTO_UDP, NULL, &rtcp_port); |
| 301 | |
| 302 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 303 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 304 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 305 | (nat_rtp_rtcp = rcu_dereference(nat_rtp_rtcp_hook)) && |
| 306 | ct->status & IPS_NAT_MASK) { |
| 307 | /* NAT needed */ |
| 308 | ret = nat_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, |
| 309 | taddr, port, rtp_port, rtp_exp, rtcp_exp); |
| 310 | } else { /* Conntrack only */ |
| 311 | if (nf_conntrack_expect_related(rtp_exp) == 0) { |
| 312 | if (nf_conntrack_expect_related(rtcp_exp) == 0) { |
| 313 | DEBUGP("nf_ct_h323: expect RTP "); |
| 314 | NF_CT_DUMP_TUPLE(&rtp_exp->tuple); |
| 315 | DEBUGP("nf_ct_h323: expect RTCP "); |
| 316 | NF_CT_DUMP_TUPLE(&rtcp_exp->tuple); |
| 317 | } else { |
| 318 | nf_conntrack_unexpect_related(rtp_exp); |
| 319 | ret = -1; |
| 320 | } |
| 321 | } else |
| 322 | ret = -1; |
| 323 | } |
| 324 | |
| 325 | nf_conntrack_expect_put(rtp_exp); |
| 326 | nf_conntrack_expect_put(rtcp_exp); |
| 327 | |
| 328 | return ret; |
| 329 | } |
| 330 | |
| 331 | /****************************************************************************/ |
| 332 | static int expect_t120(struct sk_buff **pskb, |
| 333 | struct nf_conn *ct, |
| 334 | enum ip_conntrack_info ctinfo, |
| 335 | unsigned char **data, int dataoff, |
| 336 | H245_TransportAddress *taddr) |
| 337 | { |
| 338 | int dir = CTINFO2DIR(ctinfo); |
| 339 | int ret = 0; |
| 340 | __be16 port; |
| 341 | union nf_conntrack_address addr; |
| 342 | struct nf_conntrack_expect *exp; |
| 343 | typeof(nat_t120_hook) nat_t120; |
| 344 | |
| 345 | /* Read T.120 address */ |
| 346 | if (!get_h245_addr(ct, *data, taddr, &addr, &port) || |
| 347 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 348 | port == 0) |
| 349 | return 0; |
| 350 | |
| 351 | /* Create expect for T.120 connections */ |
| 352 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) |
| 353 | return -1; |
| 354 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
| 355 | &ct->tuplehash[!dir].tuple.src.u3, |
| 356 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 357 | IPPROTO_TCP, NULL, &port); |
| 358 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple channels */ |
| 359 | |
| 360 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 361 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 362 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 363 | (nat_t120 = rcu_dereference(nat_t120_hook)) && |
| 364 | ct->status & IPS_NAT_MASK) { |
| 365 | /* NAT needed */ |
| 366 | ret = nat_t120(pskb, ct, ctinfo, data, dataoff, taddr, |
| 367 | port, exp); |
| 368 | } else { /* Conntrack only */ |
| 369 | if (nf_conntrack_expect_related(exp) == 0) { |
| 370 | DEBUGP("nf_ct_h323: expect T.120 "); |
| 371 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 372 | } else |
| 373 | ret = -1; |
| 374 | } |
| 375 | |
| 376 | nf_conntrack_expect_put(exp); |
| 377 | |
| 378 | return ret; |
| 379 | } |
| 380 | |
| 381 | /****************************************************************************/ |
| 382 | static int process_h245_channel(struct sk_buff **pskb, |
| 383 | struct nf_conn *ct, |
| 384 | enum ip_conntrack_info ctinfo, |
| 385 | unsigned char **data, int dataoff, |
| 386 | H2250LogicalChannelParameters *channel) |
| 387 | { |
| 388 | int ret; |
| 389 | |
| 390 | if (channel->options & eH2250LogicalChannelParameters_mediaChannel) { |
| 391 | /* RTP */ |
| 392 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, |
| 393 | &channel->mediaChannel); |
| 394 | if (ret < 0) |
| 395 | return -1; |
| 396 | } |
| 397 | |
| 398 | if (channel-> |
| 399 | options & eH2250LogicalChannelParameters_mediaControlChannel) { |
| 400 | /* RTCP */ |
| 401 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, |
| 402 | &channel->mediaControlChannel); |
| 403 | if (ret < 0) |
| 404 | return -1; |
| 405 | } |
| 406 | |
| 407 | return 0; |
| 408 | } |
| 409 | |
| 410 | /****************************************************************************/ |
| 411 | static int process_olc(struct sk_buff **pskb, struct nf_conn *ct, |
| 412 | enum ip_conntrack_info ctinfo, |
| 413 | unsigned char **data, int dataoff, |
| 414 | OpenLogicalChannel *olc) |
| 415 | { |
| 416 | int ret; |
| 417 | |
| 418 | DEBUGP("nf_ct_h323: OpenLogicalChannel\n"); |
| 419 | |
| 420 | if (olc->forwardLogicalChannelParameters.multiplexParameters.choice == |
| 421 | eOpenLogicalChannel_forwardLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters) |
| 422 | { |
| 423 | ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff, |
| 424 | &olc-> |
| 425 | forwardLogicalChannelParameters. |
| 426 | multiplexParameters. |
| 427 | h2250LogicalChannelParameters); |
| 428 | if (ret < 0) |
| 429 | return -1; |
| 430 | } |
| 431 | |
| 432 | if ((olc->options & |
| 433 | eOpenLogicalChannel_reverseLogicalChannelParameters) && |
| 434 | (olc->reverseLogicalChannelParameters.options & |
| 435 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters) |
| 436 | && (olc->reverseLogicalChannelParameters.multiplexParameters. |
| 437 | choice == |
| 438 | eOpenLogicalChannel_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 439 | { |
| 440 | ret = |
| 441 | process_h245_channel(pskb, ct, ctinfo, data, dataoff, |
| 442 | &olc-> |
| 443 | reverseLogicalChannelParameters. |
| 444 | multiplexParameters. |
| 445 | h2250LogicalChannelParameters); |
| 446 | if (ret < 0) |
| 447 | return -1; |
| 448 | } |
| 449 | |
| 450 | if ((olc->options & eOpenLogicalChannel_separateStack) && |
| 451 | olc->forwardLogicalChannelParameters.dataType.choice == |
| 452 | eDataType_data && |
| 453 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 454 | choice == eDataApplicationCapability_application_t120 && |
| 455 | olc->forwardLogicalChannelParameters.dataType.data.application. |
| 456 | t120.choice == eDataProtocolCapability_separateLANStack && |
| 457 | olc->separateStack.networkAddress.choice == |
| 458 | eNetworkAccessParameters_networkAddress_localAreaAddress) { |
| 459 | ret = expect_t120(pskb, ct, ctinfo, data, dataoff, |
| 460 | &olc->separateStack.networkAddress. |
| 461 | localAreaAddress); |
| 462 | if (ret < 0) |
| 463 | return -1; |
| 464 | } |
| 465 | |
| 466 | return 0; |
| 467 | } |
| 468 | |
| 469 | /****************************************************************************/ |
| 470 | static int process_olca(struct sk_buff **pskb, struct nf_conn *ct, |
| 471 | enum ip_conntrack_info ctinfo, |
| 472 | unsigned char **data, int dataoff, |
| 473 | OpenLogicalChannelAck *olca) |
| 474 | { |
| 475 | H2250LogicalChannelAckParameters *ack; |
| 476 | int ret; |
| 477 | |
| 478 | DEBUGP("nf_ct_h323: OpenLogicalChannelAck\n"); |
| 479 | |
| 480 | if ((olca->options & |
| 481 | eOpenLogicalChannelAck_reverseLogicalChannelParameters) && |
| 482 | (olca->reverseLogicalChannelParameters.options & |
| 483 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters) |
| 484 | && (olca->reverseLogicalChannelParameters.multiplexParameters. |
| 485 | choice == |
| 486 | eOpenLogicalChannelAck_reverseLogicalChannelParameters_multiplexParameters_h2250LogicalChannelParameters)) |
| 487 | { |
| 488 | ret = process_h245_channel(pskb, ct, ctinfo, data, dataoff, |
| 489 | &olca-> |
| 490 | reverseLogicalChannelParameters. |
| 491 | multiplexParameters. |
| 492 | h2250LogicalChannelParameters); |
| 493 | if (ret < 0) |
| 494 | return -1; |
| 495 | } |
| 496 | |
| 497 | if ((olca->options & |
| 498 | eOpenLogicalChannelAck_forwardMultiplexAckParameters) && |
| 499 | (olca->forwardMultiplexAckParameters.choice == |
| 500 | eOpenLogicalChannelAck_forwardMultiplexAckParameters_h2250LogicalChannelAckParameters)) |
| 501 | { |
| 502 | ack = &olca->forwardMultiplexAckParameters. |
| 503 | h2250LogicalChannelAckParameters; |
| 504 | if (ack->options & |
| 505 | eH2250LogicalChannelAckParameters_mediaChannel) { |
| 506 | /* RTP */ |
| 507 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, |
| 508 | &ack->mediaChannel); |
| 509 | if (ret < 0) |
| 510 | return -1; |
| 511 | } |
| 512 | |
| 513 | if (ack->options & |
| 514 | eH2250LogicalChannelAckParameters_mediaControlChannel) { |
| 515 | /* RTCP */ |
| 516 | ret = expect_rtp_rtcp(pskb, ct, ctinfo, data, dataoff, |
| 517 | &ack->mediaControlChannel); |
| 518 | if (ret < 0) |
| 519 | return -1; |
| 520 | } |
| 521 | } |
| 522 | |
| 523 | return 0; |
| 524 | } |
| 525 | |
| 526 | /****************************************************************************/ |
| 527 | static int process_h245(struct sk_buff **pskb, struct nf_conn *ct, |
| 528 | enum ip_conntrack_info ctinfo, |
| 529 | unsigned char **data, int dataoff, |
| 530 | MultimediaSystemControlMessage *mscm) |
| 531 | { |
| 532 | switch (mscm->choice) { |
| 533 | case eMultimediaSystemControlMessage_request: |
| 534 | if (mscm->request.choice == |
| 535 | eRequestMessage_openLogicalChannel) { |
| 536 | return process_olc(pskb, ct, ctinfo, data, dataoff, |
| 537 | &mscm->request.openLogicalChannel); |
| 538 | } |
| 539 | DEBUGP("nf_ct_h323: H.245 Request %d\n", |
| 540 | mscm->request.choice); |
| 541 | break; |
| 542 | case eMultimediaSystemControlMessage_response: |
| 543 | if (mscm->response.choice == |
| 544 | eResponseMessage_openLogicalChannelAck) { |
| 545 | return process_olca(pskb, ct, ctinfo, data, dataoff, |
| 546 | &mscm->response. |
| 547 | openLogicalChannelAck); |
| 548 | } |
| 549 | DEBUGP("nf_ct_h323: H.245 Response %d\n", |
| 550 | mscm->response.choice); |
| 551 | break; |
| 552 | default: |
| 553 | DEBUGP("nf_ct_h323: H.245 signal %d\n", mscm->choice); |
| 554 | break; |
| 555 | } |
| 556 | |
| 557 | return 0; |
| 558 | } |
| 559 | |
| 560 | /****************************************************************************/ |
| 561 | static int h245_help(struct sk_buff **pskb, unsigned int protoff, |
| 562 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 563 | { |
| 564 | static MultimediaSystemControlMessage mscm; |
| 565 | unsigned char *data = NULL; |
| 566 | int datalen; |
| 567 | int dataoff; |
| 568 | int ret; |
| 569 | |
| 570 | /* Until there's been traffic both ways, don't look in packets. */ |
| 571 | if (ctinfo != IP_CT_ESTABLISHED && |
| 572 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { |
| 573 | return NF_ACCEPT; |
| 574 | } |
| 575 | DEBUGP("nf_ct_h245: skblen = %u\n", (*pskb)->len); |
| 576 | |
| 577 | spin_lock_bh(&nf_h323_lock); |
| 578 | |
| 579 | /* Process each TPKT */ |
| 580 | while (get_tpkt_data(pskb, protoff, ct, ctinfo, |
| 581 | &data, &datalen, &dataoff)) { |
| 582 | DEBUGP("nf_ct_h245: TPKT len=%d ", datalen); |
| 583 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
| 584 | |
| 585 | /* Decode H.245 signal */ |
| 586 | ret = DecodeMultimediaSystemControlMessage(data, datalen, |
| 587 | &mscm); |
| 588 | if (ret < 0) { |
| 589 | if (net_ratelimit()) |
| 590 | printk("nf_ct_h245: decoding error: %s\n", |
| 591 | ret == H323_ERROR_BOUND ? |
| 592 | "out of bound" : "out of range"); |
| 593 | /* We don't drop when decoding error */ |
| 594 | break; |
| 595 | } |
| 596 | |
| 597 | /* Process H.245 signal */ |
| 598 | if (process_h245(pskb, ct, ctinfo, &data, dataoff, &mscm) < 0) |
| 599 | goto drop; |
| 600 | } |
| 601 | |
| 602 | spin_unlock_bh(&nf_h323_lock); |
| 603 | return NF_ACCEPT; |
| 604 | |
| 605 | drop: |
| 606 | spin_unlock_bh(&nf_h323_lock); |
| 607 | if (net_ratelimit()) |
| 608 | printk("nf_ct_h245: packet dropped\n"); |
| 609 | return NF_DROP; |
| 610 | } |
| 611 | |
| 612 | /****************************************************************************/ |
| 613 | static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = { |
| 614 | .name = "H.245", |
| 615 | .me = THIS_MODULE, |
| 616 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */, |
| 617 | .timeout = 240, |
| 618 | .tuple.dst.protonum = IPPROTO_UDP, |
| 619 | .mask.src.u.udp.port = __constant_htons(0xFFFF), |
| 620 | .mask.dst.protonum = 0xFF, |
| 621 | .help = h245_help |
| 622 | }; |
| 623 | |
| 624 | /****************************************************************************/ |
| 625 | int get_h225_addr(struct nf_conn *ct, unsigned char *data, |
| 626 | TransportAddress *taddr, |
| 627 | union nf_conntrack_address *addr, __be16 *port) |
| 628 | { |
| 629 | unsigned char *p; |
| 630 | int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 631 | int len; |
| 632 | |
| 633 | switch (taddr->choice) { |
| 634 | case eTransportAddress_ipAddress: |
| 635 | if (family != AF_INET) |
| 636 | return 0; |
| 637 | p = data + taddr->ipAddress.ip; |
| 638 | len = 4; |
| 639 | break; |
| 640 | case eTransportAddress_ip6Address: |
| 641 | if (family != AF_INET6) |
| 642 | return 0; |
| 643 | p = data + taddr->ip6Address.ip6; |
| 644 | len = 16; |
| 645 | break; |
| 646 | default: |
| 647 | return 0; |
| 648 | } |
| 649 | |
| 650 | memcpy(addr, p, len); |
| 651 | memset((void *)addr + len, 0, sizeof(*addr) - len); |
| 652 | memcpy(port, p + len, sizeof(__be16)); |
| 653 | |
| 654 | return 1; |
| 655 | } |
| 656 | |
| 657 | /****************************************************************************/ |
| 658 | static int expect_h245(struct sk_buff **pskb, struct nf_conn *ct, |
| 659 | enum ip_conntrack_info ctinfo, |
| 660 | unsigned char **data, int dataoff, |
| 661 | TransportAddress *taddr) |
| 662 | { |
| 663 | int dir = CTINFO2DIR(ctinfo); |
| 664 | int ret = 0; |
| 665 | __be16 port; |
| 666 | union nf_conntrack_address addr; |
| 667 | struct nf_conntrack_expect *exp; |
| 668 | typeof(nat_h245_hook) nat_h245; |
| 669 | |
| 670 | /* Read h245Address */ |
| 671 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || |
| 672 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) || |
| 673 | port == 0) |
| 674 | return 0; |
| 675 | |
| 676 | /* Create expect for h245 connection */ |
| 677 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) |
| 678 | return -1; |
| 679 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
| 680 | &ct->tuplehash[!dir].tuple.src.u3, |
| 681 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 682 | IPPROTO_TCP, NULL, &port); |
| 683 | exp->helper = &nf_conntrack_helper_h245; |
| 684 | |
| 685 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 686 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 687 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 688 | (nat_h245 = rcu_dereference(nat_h245_hook)) && |
| 689 | ct->status & IPS_NAT_MASK) { |
| 690 | /* NAT needed */ |
| 691 | ret = nat_h245(pskb, ct, ctinfo, data, dataoff, taddr, |
| 692 | port, exp); |
| 693 | } else { /* Conntrack only */ |
| 694 | if (nf_conntrack_expect_related(exp) == 0) { |
| 695 | DEBUGP("nf_ct_q931: expect H.245 "); |
| 696 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 697 | } else |
| 698 | ret = -1; |
| 699 | } |
| 700 | |
| 701 | nf_conntrack_expect_put(exp); |
| 702 | |
| 703 | return ret; |
| 704 | } |
| 705 | |
| 706 | /* If the calling party is on the same side of the forward-to party, |
| 707 | * we don't need to track the second call */ |
| 708 | static int callforward_do_filter(union nf_conntrack_address *src, |
| 709 | union nf_conntrack_address *dst, |
| 710 | int family) |
| 711 | { |
| 712 | struct flowi fl1, fl2; |
| 713 | int ret = 0; |
| 714 | |
| 715 | memset(&fl1, 0, sizeof(fl1)); |
| 716 | memset(&fl2, 0, sizeof(fl2)); |
| 717 | |
| 718 | switch (family) { |
| 719 | case AF_INET: { |
| 720 | struct rtable *rt1, *rt2; |
| 721 | |
| 722 | fl1.fl4_dst = src->ip; |
| 723 | fl2.fl4_dst = dst->ip; |
| 724 | if (ip_route_output_key(&rt1, &fl1) == 0) { |
| 725 | if (ip_route_output_key(&rt2, &fl2) == 0) { |
| 726 | if (rt1->rt_gateway == rt2->rt_gateway && |
| 727 | rt1->u.dst.dev == rt2->u.dst.dev) |
| 728 | ret = 1; |
| 729 | dst_release(&rt2->u.dst); |
| 730 | } |
| 731 | dst_release(&rt1->u.dst); |
| 732 | } |
| 733 | break; |
| 734 | } |
| 735 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 736 | case AF_INET6: { |
| 737 | struct rt6_info *rt1, *rt2; |
| 738 | |
| 739 | memcpy(&fl1.fl6_dst, src, sizeof(fl1.fl6_dst)); |
| 740 | memcpy(&fl2.fl6_dst, dst, sizeof(fl2.fl6_dst)); |
| 741 | rt1 = (struct rt6_info *)ip6_route_output(NULL, &fl1); |
| 742 | if (rt1) { |
| 743 | rt2 = (struct rt6_info *)ip6_route_output(NULL, &fl2); |
| 744 | if (rt2) { |
| 745 | if (!memcmp(&rt1->rt6i_gateway, &rt2->rt6i_gateway, |
| 746 | sizeof(rt1->rt6i_gateway)) && |
| 747 | rt1->u.dst.dev == rt2->u.dst.dev) |
| 748 | ret = 1; |
| 749 | dst_release(&rt2->u.dst); |
| 750 | } |
| 751 | dst_release(&rt1->u.dst); |
| 752 | } |
| 753 | break; |
| 754 | } |
| 755 | #endif |
| 756 | } |
| 757 | return ret; |
| 758 | |
| 759 | } |
| 760 | |
| 761 | /****************************************************************************/ |
| 762 | static int expect_callforwarding(struct sk_buff **pskb, |
| 763 | struct nf_conn *ct, |
| 764 | enum ip_conntrack_info ctinfo, |
| 765 | unsigned char **data, int dataoff, |
| 766 | TransportAddress *taddr) |
| 767 | { |
| 768 | int dir = CTINFO2DIR(ctinfo); |
| 769 | int ret = 0; |
| 770 | __be16 port; |
| 771 | union nf_conntrack_address addr; |
| 772 | struct nf_conntrack_expect *exp; |
| 773 | typeof(nat_callforwarding_hook) nat_callforwarding; |
| 774 | |
| 775 | /* Read alternativeAddress */ |
| 776 | if (!get_h225_addr(ct, *data, taddr, &addr, &port) || port == 0) |
| 777 | return 0; |
| 778 | |
| 779 | /* If the calling party is on the same side of the forward-to party, |
| 780 | * we don't need to track the second call */ |
| 781 | if (callforward_filter && |
| 782 | callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, |
| 783 | ct->tuplehash[!dir].tuple.src.l3num)) { |
| 784 | DEBUGP("nf_ct_q931: Call Forwarding not tracked\n"); |
| 785 | return 0; |
| 786 | } |
| 787 | |
| 788 | /* Create expect for the second call leg */ |
| 789 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) |
| 790 | return -1; |
| 791 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
| 792 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 793 | IPPROTO_TCP, NULL, &port); |
| 794 | exp->helper = nf_conntrack_helper_q931; |
| 795 | |
| 796 | if (memcmp(&ct->tuplehash[dir].tuple.src.u3, |
| 797 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 798 | sizeof(ct->tuplehash[dir].tuple.src.u3)) && |
| 799 | (nat_callforwarding = rcu_dereference(nat_callforwarding_hook)) && |
| 800 | ct->status & IPS_NAT_MASK) { |
| 801 | /* Need NAT */ |
| 802 | ret = nat_callforwarding(pskb, ct, ctinfo, data, dataoff, |
| 803 | taddr, port, exp); |
| 804 | } else { /* Conntrack only */ |
| 805 | if (nf_conntrack_expect_related(exp) == 0) { |
| 806 | DEBUGP("nf_ct_q931: expect Call Forwarding "); |
| 807 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 808 | } else |
| 809 | ret = -1; |
| 810 | } |
| 811 | |
| 812 | nf_conntrack_expect_put(exp); |
| 813 | |
| 814 | return ret; |
| 815 | } |
| 816 | |
| 817 | /****************************************************************************/ |
| 818 | static int process_setup(struct sk_buff **pskb, struct nf_conn *ct, |
| 819 | enum ip_conntrack_info ctinfo, |
| 820 | unsigned char **data, int dataoff, |
| 821 | Setup_UUIE *setup) |
| 822 | { |
| 823 | int dir = CTINFO2DIR(ctinfo); |
| 824 | int ret; |
| 825 | int i; |
| 826 | __be16 port; |
| 827 | union nf_conntrack_address addr; |
| 828 | typeof(set_h225_addr_hook) set_h225_addr; |
| 829 | |
| 830 | DEBUGP("nf_ct_q931: Setup\n"); |
| 831 | |
| 832 | if (setup->options & eSetup_UUIE_h245Address) { |
| 833 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, |
| 834 | &setup->h245Address); |
| 835 | if (ret < 0) |
| 836 | return -1; |
| 837 | } |
| 838 | |
| 839 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 840 | if ((setup->options & eSetup_UUIE_destCallSignalAddress) && |
| 841 | (set_h225_addr) && ct->status && IPS_NAT_MASK && |
| 842 | get_h225_addr(ct, *data, &setup->destCallSignalAddress, |
| 843 | &addr, &port) && |
| 844 | memcmp(&addr, &ct->tuplehash[!dir].tuple.src.u3, sizeof(addr))) { |
| 845 | DEBUGP("nf_ct_q931: set destCallSignalAddress " |
| 846 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", |
| 847 | NIP6(*(struct in6_addr *)&addr), ntohs(port), |
| 848 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.src.u3), |
| 849 | ntohs(ct->tuplehash[!dir].tuple.src.u.tcp.port)); |
| 850 | ret = set_h225_addr(pskb, data, dataoff, |
| 851 | &setup->destCallSignalAddress, |
| 852 | &ct->tuplehash[!dir].tuple.src.u3, |
| 853 | ct->tuplehash[!dir].tuple.src.u.tcp.port); |
| 854 | if (ret < 0) |
| 855 | return -1; |
| 856 | } |
| 857 | |
| 858 | if ((setup->options & eSetup_UUIE_sourceCallSignalAddress) && |
| 859 | (set_h225_addr) && ct->status & IPS_NAT_MASK && |
| 860 | get_h225_addr(ct, *data, &setup->sourceCallSignalAddress, |
| 861 | &addr, &port) && |
| 862 | memcmp(&addr, &ct->tuplehash[!dir].tuple.dst.u3, sizeof(addr))) { |
| 863 | DEBUGP("nf_ct_q931: set sourceCallSignalAddress " |
| 864 | NIP6_FMT ":%hu->" NIP6_FMT ":%hu\n", |
| 865 | NIP6(*(struct in6_addr *)&addr), ntohs(port), |
| 866 | NIP6(*(struct in6_addr *)&ct->tuplehash[!dir].tuple.dst.u3), |
| 867 | ntohs(ct->tuplehash[!dir].tuple.dst.u.tcp.port)); |
| 868 | ret = set_h225_addr(pskb, data, dataoff, |
| 869 | &setup->sourceCallSignalAddress, |
| 870 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 871 | ct->tuplehash[!dir].tuple.dst.u.tcp.port); |
| 872 | if (ret < 0) |
| 873 | return -1; |
| 874 | } |
| 875 | |
| 876 | if (setup->options & eSetup_UUIE_fastStart) { |
| 877 | for (i = 0; i < setup->fastStart.count; i++) { |
| 878 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, |
| 879 | &setup->fastStart.item[i]); |
| 880 | if (ret < 0) |
| 881 | return -1; |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | return 0; |
| 886 | } |
| 887 | |
| 888 | /****************************************************************************/ |
| 889 | static int process_callproceeding(struct sk_buff **pskb, |
| 890 | struct nf_conn *ct, |
| 891 | enum ip_conntrack_info ctinfo, |
| 892 | unsigned char **data, int dataoff, |
| 893 | CallProceeding_UUIE *callproc) |
| 894 | { |
| 895 | int ret; |
| 896 | int i; |
| 897 | |
| 898 | DEBUGP("nf_ct_q931: CallProceeding\n"); |
| 899 | |
| 900 | if (callproc->options & eCallProceeding_UUIE_h245Address) { |
| 901 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, |
| 902 | &callproc->h245Address); |
| 903 | if (ret < 0) |
| 904 | return -1; |
| 905 | } |
| 906 | |
| 907 | if (callproc->options & eCallProceeding_UUIE_fastStart) { |
| 908 | for (i = 0; i < callproc->fastStart.count; i++) { |
| 909 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, |
| 910 | &callproc->fastStart.item[i]); |
| 911 | if (ret < 0) |
| 912 | return -1; |
| 913 | } |
| 914 | } |
| 915 | |
| 916 | return 0; |
| 917 | } |
| 918 | |
| 919 | /****************************************************************************/ |
| 920 | static int process_connect(struct sk_buff **pskb, struct nf_conn *ct, |
| 921 | enum ip_conntrack_info ctinfo, |
| 922 | unsigned char **data, int dataoff, |
| 923 | Connect_UUIE *connect) |
| 924 | { |
| 925 | int ret; |
| 926 | int i; |
| 927 | |
| 928 | DEBUGP("nf_ct_q931: Connect\n"); |
| 929 | |
| 930 | if (connect->options & eConnect_UUIE_h245Address) { |
| 931 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, |
| 932 | &connect->h245Address); |
| 933 | if (ret < 0) |
| 934 | return -1; |
| 935 | } |
| 936 | |
| 937 | if (connect->options & eConnect_UUIE_fastStart) { |
| 938 | for (i = 0; i < connect->fastStart.count; i++) { |
| 939 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, |
| 940 | &connect->fastStart.item[i]); |
| 941 | if (ret < 0) |
| 942 | return -1; |
| 943 | } |
| 944 | } |
| 945 | |
| 946 | return 0; |
| 947 | } |
| 948 | |
| 949 | /****************************************************************************/ |
| 950 | static int process_alerting(struct sk_buff **pskb, struct nf_conn *ct, |
| 951 | enum ip_conntrack_info ctinfo, |
| 952 | unsigned char **data, int dataoff, |
| 953 | Alerting_UUIE *alert) |
| 954 | { |
| 955 | int ret; |
| 956 | int i; |
| 957 | |
| 958 | DEBUGP("nf_ct_q931: Alerting\n"); |
| 959 | |
| 960 | if (alert->options & eAlerting_UUIE_h245Address) { |
| 961 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, |
| 962 | &alert->h245Address); |
| 963 | if (ret < 0) |
| 964 | return -1; |
| 965 | } |
| 966 | |
| 967 | if (alert->options & eAlerting_UUIE_fastStart) { |
| 968 | for (i = 0; i < alert->fastStart.count; i++) { |
| 969 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, |
| 970 | &alert->fastStart.item[i]); |
| 971 | if (ret < 0) |
| 972 | return -1; |
| 973 | } |
| 974 | } |
| 975 | |
| 976 | return 0; |
| 977 | } |
| 978 | |
| 979 | /****************************************************************************/ |
| 980 | static int process_information(struct sk_buff **pskb, |
| 981 | struct nf_conn *ct, |
| 982 | enum ip_conntrack_info ctinfo, |
| 983 | unsigned char **data, int dataoff, |
| 984 | Information_UUIE *info) |
| 985 | { |
| 986 | int ret; |
| 987 | int i; |
| 988 | |
| 989 | DEBUGP("nf_ct_q931: Information\n"); |
| 990 | |
| 991 | if (info->options & eInformation_UUIE_fastStart) { |
| 992 | for (i = 0; i < info->fastStart.count; i++) { |
| 993 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, |
| 994 | &info->fastStart.item[i]); |
| 995 | if (ret < 0) |
| 996 | return -1; |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | return 0; |
| 1001 | } |
| 1002 | |
| 1003 | /****************************************************************************/ |
| 1004 | static int process_facility(struct sk_buff **pskb, struct nf_conn *ct, |
| 1005 | enum ip_conntrack_info ctinfo, |
| 1006 | unsigned char **data, int dataoff, |
| 1007 | Facility_UUIE *facility) |
| 1008 | { |
| 1009 | int ret; |
| 1010 | int i; |
| 1011 | |
| 1012 | DEBUGP("nf_ct_q931: Facility\n"); |
| 1013 | |
| 1014 | if (facility->reason.choice == eFacilityReason_callForwarded) { |
| 1015 | if (facility->options & eFacility_UUIE_alternativeAddress) |
| 1016 | return expect_callforwarding(pskb, ct, ctinfo, data, |
| 1017 | dataoff, |
| 1018 | &facility-> |
| 1019 | alternativeAddress); |
| 1020 | return 0; |
| 1021 | } |
| 1022 | |
| 1023 | if (facility->options & eFacility_UUIE_h245Address) { |
| 1024 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, |
| 1025 | &facility->h245Address); |
| 1026 | if (ret < 0) |
| 1027 | return -1; |
| 1028 | } |
| 1029 | |
| 1030 | if (facility->options & eFacility_UUIE_fastStart) { |
| 1031 | for (i = 0; i < facility->fastStart.count; i++) { |
| 1032 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, |
| 1033 | &facility->fastStart.item[i]); |
| 1034 | if (ret < 0) |
| 1035 | return -1; |
| 1036 | } |
| 1037 | } |
| 1038 | |
| 1039 | return 0; |
| 1040 | } |
| 1041 | |
| 1042 | /****************************************************************************/ |
| 1043 | static int process_progress(struct sk_buff **pskb, struct nf_conn *ct, |
| 1044 | enum ip_conntrack_info ctinfo, |
| 1045 | unsigned char **data, int dataoff, |
| 1046 | Progress_UUIE *progress) |
| 1047 | { |
| 1048 | int ret; |
| 1049 | int i; |
| 1050 | |
| 1051 | DEBUGP("nf_ct_q931: Progress\n"); |
| 1052 | |
| 1053 | if (progress->options & eProgress_UUIE_h245Address) { |
| 1054 | ret = expect_h245(pskb, ct, ctinfo, data, dataoff, |
| 1055 | &progress->h245Address); |
| 1056 | if (ret < 0) |
| 1057 | return -1; |
| 1058 | } |
| 1059 | |
| 1060 | if (progress->options & eProgress_UUIE_fastStart) { |
| 1061 | for (i = 0; i < progress->fastStart.count; i++) { |
| 1062 | ret = process_olc(pskb, ct, ctinfo, data, dataoff, |
| 1063 | &progress->fastStart.item[i]); |
| 1064 | if (ret < 0) |
| 1065 | return -1; |
| 1066 | } |
| 1067 | } |
| 1068 | |
| 1069 | return 0; |
| 1070 | } |
| 1071 | |
| 1072 | /****************************************************************************/ |
| 1073 | static int process_q931(struct sk_buff **pskb, struct nf_conn *ct, |
| 1074 | enum ip_conntrack_info ctinfo, |
| 1075 | unsigned char **data, int dataoff, Q931 *q931) |
| 1076 | { |
| 1077 | H323_UU_PDU *pdu = &q931->UUIE.h323_uu_pdu; |
| 1078 | int i; |
| 1079 | int ret = 0; |
| 1080 | |
| 1081 | switch (pdu->h323_message_body.choice) { |
| 1082 | case eH323_UU_PDU_h323_message_body_setup: |
| 1083 | ret = process_setup(pskb, ct, ctinfo, data, dataoff, |
| 1084 | &pdu->h323_message_body.setup); |
| 1085 | break; |
| 1086 | case eH323_UU_PDU_h323_message_body_callProceeding: |
| 1087 | ret = process_callproceeding(pskb, ct, ctinfo, data, dataoff, |
| 1088 | &pdu->h323_message_body. |
| 1089 | callProceeding); |
| 1090 | break; |
| 1091 | case eH323_UU_PDU_h323_message_body_connect: |
| 1092 | ret = process_connect(pskb, ct, ctinfo, data, dataoff, |
| 1093 | &pdu->h323_message_body.connect); |
| 1094 | break; |
| 1095 | case eH323_UU_PDU_h323_message_body_alerting: |
| 1096 | ret = process_alerting(pskb, ct, ctinfo, data, dataoff, |
| 1097 | &pdu->h323_message_body.alerting); |
| 1098 | break; |
| 1099 | case eH323_UU_PDU_h323_message_body_information: |
| 1100 | ret = process_information(pskb, ct, ctinfo, data, dataoff, |
| 1101 | &pdu->h323_message_body. |
| 1102 | information); |
| 1103 | break; |
| 1104 | case eH323_UU_PDU_h323_message_body_facility: |
| 1105 | ret = process_facility(pskb, ct, ctinfo, data, dataoff, |
| 1106 | &pdu->h323_message_body.facility); |
| 1107 | break; |
| 1108 | case eH323_UU_PDU_h323_message_body_progress: |
| 1109 | ret = process_progress(pskb, ct, ctinfo, data, dataoff, |
| 1110 | &pdu->h323_message_body.progress); |
| 1111 | break; |
| 1112 | default: |
| 1113 | DEBUGP("nf_ct_q931: Q.931 signal %d\n", |
| 1114 | pdu->h323_message_body.choice); |
| 1115 | break; |
| 1116 | } |
| 1117 | |
| 1118 | if (ret < 0) |
| 1119 | return -1; |
| 1120 | |
| 1121 | if (pdu->options & eH323_UU_PDU_h245Control) { |
| 1122 | for (i = 0; i < pdu->h245Control.count; i++) { |
| 1123 | ret = process_h245(pskb, ct, ctinfo, data, dataoff, |
| 1124 | &pdu->h245Control.item[i]); |
| 1125 | if (ret < 0) |
| 1126 | return -1; |
| 1127 | } |
| 1128 | } |
| 1129 | |
| 1130 | return 0; |
| 1131 | } |
| 1132 | |
| 1133 | /****************************************************************************/ |
| 1134 | static int q931_help(struct sk_buff **pskb, unsigned int protoff, |
| 1135 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1136 | { |
| 1137 | static Q931 q931; |
| 1138 | unsigned char *data = NULL; |
| 1139 | int datalen; |
| 1140 | int dataoff; |
| 1141 | int ret; |
| 1142 | |
| 1143 | /* Until there's been traffic both ways, don't look in packets. */ |
| 1144 | if (ctinfo != IP_CT_ESTABLISHED && |
| 1145 | ctinfo != IP_CT_ESTABLISHED + IP_CT_IS_REPLY) { |
| 1146 | return NF_ACCEPT; |
| 1147 | } |
| 1148 | DEBUGP("nf_ct_q931: skblen = %u\n", (*pskb)->len); |
| 1149 | |
| 1150 | spin_lock_bh(&nf_h323_lock); |
| 1151 | |
| 1152 | /* Process each TPKT */ |
| 1153 | while (get_tpkt_data(pskb, protoff, ct, ctinfo, |
| 1154 | &data, &datalen, &dataoff)) { |
| 1155 | DEBUGP("nf_ct_q931: TPKT len=%d ", datalen); |
| 1156 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
| 1157 | |
| 1158 | /* Decode Q.931 signal */ |
| 1159 | ret = DecodeQ931(data, datalen, &q931); |
| 1160 | if (ret < 0) { |
| 1161 | if (net_ratelimit()) |
| 1162 | printk("nf_ct_q931: decoding error: %s\n", |
| 1163 | ret == H323_ERROR_BOUND ? |
| 1164 | "out of bound" : "out of range"); |
| 1165 | /* We don't drop when decoding error */ |
| 1166 | break; |
| 1167 | } |
| 1168 | |
| 1169 | /* Process Q.931 signal */ |
| 1170 | if (process_q931(pskb, ct, ctinfo, &data, dataoff, &q931) < 0) |
| 1171 | goto drop; |
| 1172 | } |
| 1173 | |
| 1174 | spin_unlock_bh(&nf_h323_lock); |
| 1175 | return NF_ACCEPT; |
| 1176 | |
| 1177 | drop: |
| 1178 | spin_unlock_bh(&nf_h323_lock); |
| 1179 | if (net_ratelimit()) |
| 1180 | printk("nf_ct_q931: packet dropped\n"); |
| 1181 | return NF_DROP; |
| 1182 | } |
| 1183 | |
| 1184 | /****************************************************************************/ |
| 1185 | static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = { |
| 1186 | { |
| 1187 | .name = "Q.931", |
| 1188 | .me = THIS_MODULE, |
| 1189 | /* T.120 and H.245 */ |
| 1190 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, |
| 1191 | .timeout = 240, |
| 1192 | .tuple.src.l3num = AF_INET, |
| 1193 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), |
| 1194 | .tuple.dst.protonum = IPPROTO_TCP, |
| 1195 | .mask.src.l3num = 0xFFFF, |
| 1196 | .mask.src.u.tcp.port = __constant_htons(0xFFFF), |
| 1197 | .mask.dst.protonum = 0xFF, |
| 1198 | .help = q931_help |
| 1199 | }, |
| 1200 | { |
| 1201 | .name = "Q.931", |
| 1202 | .me = THIS_MODULE, |
| 1203 | /* T.120 and H.245 */ |
| 1204 | .max_expected = H323_RTP_CHANNEL_MAX * 4 + 4, |
| 1205 | .timeout = 240, |
| 1206 | .tuple.src.l3num = AF_INET6, |
| 1207 | .tuple.src.u.tcp.port = __constant_htons(Q931_PORT), |
| 1208 | .tuple.dst.protonum = IPPROTO_TCP, |
| 1209 | .mask.src.l3num = 0xFFFF, |
| 1210 | .mask.src.u.tcp.port = __constant_htons(0xFFFF), |
| 1211 | .mask.dst.protonum = 0xFF, |
| 1212 | .help = q931_help |
| 1213 | }, |
| 1214 | }; |
| 1215 | |
| 1216 | /****************************************************************************/ |
| 1217 | static unsigned char *get_udp_data(struct sk_buff **pskb, unsigned int protoff, |
| 1218 | int *datalen) |
| 1219 | { |
| 1220 | struct udphdr _uh, *uh; |
| 1221 | int dataoff; |
| 1222 | |
| 1223 | uh = skb_header_pointer(*pskb, protoff, sizeof(_uh), &_uh); |
| 1224 | if (uh == NULL) |
| 1225 | return NULL; |
| 1226 | dataoff = protoff + sizeof(_uh); |
| 1227 | if (dataoff >= (*pskb)->len) |
| 1228 | return NULL; |
| 1229 | *datalen = (*pskb)->len - dataoff; |
| 1230 | return skb_header_pointer(*pskb, dataoff, *datalen, h323_buffer); |
| 1231 | } |
| 1232 | |
| 1233 | /****************************************************************************/ |
| 1234 | static struct nf_conntrack_expect *find_expect(struct nf_conn *ct, |
| 1235 | union nf_conntrack_address *addr, |
| 1236 | __be16 port) |
| 1237 | { |
| 1238 | struct nf_conntrack_expect *exp; |
| 1239 | struct nf_conntrack_tuple tuple; |
| 1240 | |
| 1241 | memset(&tuple.src.u3, 0, sizeof(tuple.src.u3)); |
| 1242 | tuple.src.u.tcp.port = 0; |
| 1243 | memcpy(&tuple.dst.u3, addr, sizeof(tuple.dst.u3)); |
| 1244 | tuple.dst.u.tcp.port = port; |
| 1245 | tuple.dst.protonum = IPPROTO_TCP; |
| 1246 | |
| 1247 | exp = __nf_conntrack_expect_find(&tuple); |
| 1248 | if (exp && exp->master == ct) |
| 1249 | return exp; |
| 1250 | return NULL; |
| 1251 | } |
| 1252 | |
| 1253 | /****************************************************************************/ |
| 1254 | static int set_expect_timeout(struct nf_conntrack_expect *exp, |
| 1255 | unsigned timeout) |
| 1256 | { |
| 1257 | if (!exp || !del_timer(&exp->timeout)) |
| 1258 | return 0; |
| 1259 | |
| 1260 | exp->timeout.expires = jiffies + timeout * HZ; |
| 1261 | add_timer(&exp->timeout); |
| 1262 | |
| 1263 | return 1; |
| 1264 | } |
| 1265 | |
| 1266 | /****************************************************************************/ |
| 1267 | static int expect_q931(struct sk_buff **pskb, struct nf_conn *ct, |
| 1268 | enum ip_conntrack_info ctinfo, |
| 1269 | unsigned char **data, |
| 1270 | TransportAddress *taddr, int count) |
| 1271 | { |
| 1272 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 1273 | int dir = CTINFO2DIR(ctinfo); |
| 1274 | int ret = 0; |
| 1275 | int i; |
| 1276 | __be16 port; |
| 1277 | union nf_conntrack_address addr; |
| 1278 | struct nf_conntrack_expect *exp; |
| 1279 | typeof(nat_q931_hook) nat_q931; |
| 1280 | |
| 1281 | /* Look for the first related address */ |
| 1282 | for (i = 0; i < count; i++) { |
| 1283 | if (get_h225_addr(ct, *data, &taddr[i], &addr, &port) && |
| 1284 | memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, |
| 1285 | sizeof(addr)) == 0 && port != 0) |
| 1286 | break; |
| 1287 | } |
| 1288 | |
| 1289 | if (i >= count) /* Not found */ |
| 1290 | return 0; |
| 1291 | |
| 1292 | /* Create expect for Q.931 */ |
| 1293 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) |
| 1294 | return -1; |
| 1295 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
| 1296 | gkrouted_only ? /* only accept calls from GK? */ |
| 1297 | &ct->tuplehash[!dir].tuple.src.u3 : |
| 1298 | NULL, |
| 1299 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1300 | IPPROTO_TCP, NULL, &port); |
| 1301 | exp->helper = nf_conntrack_helper_q931; |
| 1302 | exp->flags = NF_CT_EXPECT_PERMANENT; /* Accept multiple calls */ |
| 1303 | |
| 1304 | nat_q931 = rcu_dereference(nat_q931_hook); |
| 1305 | if (nat_q931 && ct->status & IPS_NAT_MASK) { /* Need NAT */ |
| 1306 | ret = nat_q931(pskb, ct, ctinfo, data, taddr, i, port, exp); |
| 1307 | } else { /* Conntrack only */ |
| 1308 | if (nf_conntrack_expect_related(exp) == 0) { |
| 1309 | DEBUGP("nf_ct_ras: expect Q.931 "); |
| 1310 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 1311 | |
| 1312 | /* Save port for looking up expect in processing RCF */ |
| 1313 | info->sig_port[dir] = port; |
| 1314 | } else |
| 1315 | ret = -1; |
| 1316 | } |
| 1317 | |
| 1318 | nf_conntrack_expect_put(exp); |
| 1319 | |
| 1320 | return ret; |
| 1321 | } |
| 1322 | |
| 1323 | /****************************************************************************/ |
| 1324 | static int process_grq(struct sk_buff **pskb, struct nf_conn *ct, |
| 1325 | enum ip_conntrack_info ctinfo, |
| 1326 | unsigned char **data, GatekeeperRequest *grq) |
| 1327 | { |
| 1328 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1329 | |
| 1330 | DEBUGP("nf_ct_ras: GRQ\n"); |
| 1331 | |
| 1332 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1333 | if (set_ras_addr && ct->status & IPS_NAT_MASK) /* NATed */ |
| 1334 | return set_ras_addr(pskb, ct, ctinfo, data, |
| 1335 | &grq->rasAddress, 1); |
| 1336 | return 0; |
| 1337 | } |
| 1338 | |
| 1339 | /****************************************************************************/ |
| 1340 | static int process_gcf(struct sk_buff **pskb, struct nf_conn *ct, |
| 1341 | enum ip_conntrack_info ctinfo, |
| 1342 | unsigned char **data, GatekeeperConfirm *gcf) |
| 1343 | { |
| 1344 | int dir = CTINFO2DIR(ctinfo); |
| 1345 | int ret = 0; |
| 1346 | __be16 port; |
| 1347 | union nf_conntrack_address addr; |
| 1348 | struct nf_conntrack_expect *exp; |
| 1349 | |
| 1350 | DEBUGP("nf_ct_ras: GCF\n"); |
| 1351 | |
| 1352 | if (!get_h225_addr(ct, *data, &gcf->rasAddress, &addr, &port)) |
| 1353 | return 0; |
| 1354 | |
| 1355 | /* Registration port is the same as discovery port */ |
| 1356 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1357 | port == ct->tuplehash[dir].tuple.src.u.udp.port) |
| 1358 | return 0; |
| 1359 | |
| 1360 | /* Avoid RAS expectation loops. A GCF is never expected. */ |
| 1361 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
| 1362 | return 0; |
| 1363 | |
| 1364 | /* Need new expect */ |
| 1365 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) |
| 1366 | return -1; |
| 1367 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
| 1368 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1369 | IPPROTO_UDP, NULL, &port); |
| 1370 | exp->helper = nf_conntrack_helper_ras; |
| 1371 | |
| 1372 | if (nf_conntrack_expect_related(exp) == 0) { |
| 1373 | DEBUGP("nf_ct_ras: expect RAS "); |
| 1374 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 1375 | } else |
| 1376 | ret = -1; |
| 1377 | |
| 1378 | nf_conntrack_expect_put(exp); |
| 1379 | |
| 1380 | return ret; |
| 1381 | } |
| 1382 | |
| 1383 | /****************************************************************************/ |
| 1384 | static int process_rrq(struct sk_buff **pskb, struct nf_conn *ct, |
| 1385 | enum ip_conntrack_info ctinfo, |
| 1386 | unsigned char **data, RegistrationRequest *rrq) |
| 1387 | { |
| 1388 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 1389 | int ret; |
| 1390 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1391 | |
| 1392 | DEBUGP("nf_ct_ras: RRQ\n"); |
| 1393 | |
| 1394 | ret = expect_q931(pskb, ct, ctinfo, data, |
| 1395 | rrq->callSignalAddress.item, |
| 1396 | rrq->callSignalAddress.count); |
| 1397 | if (ret < 0) |
| 1398 | return -1; |
| 1399 | |
| 1400 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1401 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { |
| 1402 | ret = set_ras_addr(pskb, ct, ctinfo, data, |
| 1403 | rrq->rasAddress.item, |
| 1404 | rrq->rasAddress.count); |
| 1405 | if (ret < 0) |
| 1406 | return -1; |
| 1407 | } |
| 1408 | |
| 1409 | if (rrq->options & eRegistrationRequest_timeToLive) { |
| 1410 | DEBUGP("nf_ct_ras: RRQ TTL = %u seconds\n", rrq->timeToLive); |
| 1411 | info->timeout = rrq->timeToLive; |
| 1412 | } else |
| 1413 | info->timeout = default_rrq_ttl; |
| 1414 | |
| 1415 | return 0; |
| 1416 | } |
| 1417 | |
| 1418 | /****************************************************************************/ |
| 1419 | static int process_rcf(struct sk_buff **pskb, struct nf_conn *ct, |
| 1420 | enum ip_conntrack_info ctinfo, |
| 1421 | unsigned char **data, RegistrationConfirm *rcf) |
| 1422 | { |
| 1423 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 1424 | int dir = CTINFO2DIR(ctinfo); |
| 1425 | int ret; |
| 1426 | struct nf_conntrack_expect *exp; |
| 1427 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1428 | |
| 1429 | DEBUGP("nf_ct_ras: RCF\n"); |
| 1430 | |
| 1431 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1432 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
| 1433 | ret = set_sig_addr(pskb, ct, ctinfo, data, |
| 1434 | rcf->callSignalAddress.item, |
| 1435 | rcf->callSignalAddress.count); |
| 1436 | if (ret < 0) |
| 1437 | return -1; |
| 1438 | } |
| 1439 | |
| 1440 | if (rcf->options & eRegistrationConfirm_timeToLive) { |
| 1441 | DEBUGP("nf_ct_ras: RCF TTL = %u seconds\n", rcf->timeToLive); |
| 1442 | info->timeout = rcf->timeToLive; |
| 1443 | } |
| 1444 | |
| 1445 | if (info->timeout > 0) { |
| 1446 | DEBUGP |
| 1447 | ("nf_ct_ras: set RAS connection timeout to %u seconds\n", |
| 1448 | info->timeout); |
| 1449 | nf_ct_refresh(ct, *pskb, info->timeout * HZ); |
| 1450 | |
| 1451 | /* Set expect timeout */ |
| 1452 | read_lock_bh(&nf_conntrack_lock); |
| 1453 | exp = find_expect(ct, &ct->tuplehash[dir].tuple.dst.u3, |
| 1454 | info->sig_port[!dir]); |
| 1455 | if (exp) { |
| 1456 | DEBUGP("nf_ct_ras: set Q.931 expect " |
| 1457 | "timeout to %u seconds for", |
| 1458 | info->timeout); |
| 1459 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 1460 | set_expect_timeout(exp, info->timeout); |
| 1461 | } |
| 1462 | read_unlock_bh(&nf_conntrack_lock); |
| 1463 | } |
| 1464 | |
| 1465 | return 0; |
| 1466 | } |
| 1467 | |
| 1468 | /****************************************************************************/ |
| 1469 | static int process_urq(struct sk_buff **pskb, struct nf_conn *ct, |
| 1470 | enum ip_conntrack_info ctinfo, |
| 1471 | unsigned char **data, UnregistrationRequest *urq) |
| 1472 | { |
| 1473 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 1474 | int dir = CTINFO2DIR(ctinfo); |
| 1475 | int ret; |
| 1476 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1477 | |
| 1478 | DEBUGP("nf_ct_ras: URQ\n"); |
| 1479 | |
| 1480 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1481 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
| 1482 | ret = set_sig_addr(pskb, ct, ctinfo, data, |
| 1483 | urq->callSignalAddress.item, |
| 1484 | urq->callSignalAddress.count); |
| 1485 | if (ret < 0) |
| 1486 | return -1; |
| 1487 | } |
| 1488 | |
| 1489 | /* Clear old expect */ |
| 1490 | nf_ct_remove_expectations(ct); |
| 1491 | info->sig_port[dir] = 0; |
| 1492 | info->sig_port[!dir] = 0; |
| 1493 | |
| 1494 | /* Give it 30 seconds for UCF or URJ */ |
| 1495 | nf_ct_refresh(ct, *pskb, 30 * HZ); |
| 1496 | |
| 1497 | return 0; |
| 1498 | } |
| 1499 | |
| 1500 | /****************************************************************************/ |
| 1501 | static int process_arq(struct sk_buff **pskb, struct nf_conn *ct, |
| 1502 | enum ip_conntrack_info ctinfo, |
| 1503 | unsigned char **data, AdmissionRequest *arq) |
| 1504 | { |
| 1505 | struct nf_ct_h323_master *info = &nfct_help(ct)->help.ct_h323_info; |
| 1506 | int dir = CTINFO2DIR(ctinfo); |
| 1507 | __be16 port; |
| 1508 | union nf_conntrack_address addr; |
| 1509 | typeof(set_h225_addr_hook) set_h225_addr; |
| 1510 | |
| 1511 | DEBUGP("nf_ct_ras: ARQ\n"); |
| 1512 | |
| 1513 | set_h225_addr = rcu_dereference(set_h225_addr_hook); |
| 1514 | if ((arq->options & eAdmissionRequest_destCallSignalAddress) && |
| 1515 | get_h225_addr(ct, *data, &arq->destCallSignalAddress, |
| 1516 | &addr, &port) && |
| 1517 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1518 | port == info->sig_port[dir] && |
| 1519 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
| 1520 | /* Answering ARQ */ |
| 1521 | return set_h225_addr(pskb, data, 0, |
| 1522 | &arq->destCallSignalAddress, |
| 1523 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1524 | info->sig_port[!dir]); |
| 1525 | } |
| 1526 | |
| 1527 | if ((arq->options & eAdmissionRequest_srcCallSignalAddress) && |
| 1528 | get_h225_addr(ct, *data, &arq->srcCallSignalAddress, |
| 1529 | &addr, &port) && |
| 1530 | !memcmp(&addr, &ct->tuplehash[dir].tuple.src.u3, sizeof(addr)) && |
| 1531 | set_h225_addr && ct->status & IPS_NAT_MASK) { |
| 1532 | /* Calling ARQ */ |
| 1533 | return set_h225_addr(pskb, data, 0, |
| 1534 | &arq->srcCallSignalAddress, |
| 1535 | &ct->tuplehash[!dir].tuple.dst.u3, |
| 1536 | port); |
| 1537 | } |
| 1538 | |
| 1539 | return 0; |
| 1540 | } |
| 1541 | |
| 1542 | /****************************************************************************/ |
| 1543 | static int process_acf(struct sk_buff **pskb, struct nf_conn *ct, |
| 1544 | enum ip_conntrack_info ctinfo, |
| 1545 | unsigned char **data, AdmissionConfirm *acf) |
| 1546 | { |
| 1547 | int dir = CTINFO2DIR(ctinfo); |
| 1548 | int ret = 0; |
| 1549 | __be16 port; |
| 1550 | union nf_conntrack_address addr; |
| 1551 | struct nf_conntrack_expect *exp; |
| 1552 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1553 | |
| 1554 | DEBUGP("nf_ct_ras: ACF\n"); |
| 1555 | |
| 1556 | if (!get_h225_addr(ct, *data, &acf->destCallSignalAddress, |
| 1557 | &addr, &port)) |
| 1558 | return 0; |
| 1559 | |
| 1560 | if (!memcmp(&addr, &ct->tuplehash[dir].tuple.dst.u3, sizeof(addr))) { |
| 1561 | /* Answering ACF */ |
| 1562 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1563 | if (set_sig_addr && ct->status & IPS_NAT_MASK) |
| 1564 | return set_sig_addr(pskb, ct, ctinfo, data, |
| 1565 | &acf->destCallSignalAddress, 1); |
| 1566 | return 0; |
| 1567 | } |
| 1568 | |
| 1569 | /* Need new expect */ |
| 1570 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) |
| 1571 | return -1; |
| 1572 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
| 1573 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1574 | IPPROTO_TCP, NULL, &port); |
| 1575 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1576 | exp->helper = nf_conntrack_helper_q931; |
| 1577 | |
| 1578 | if (nf_conntrack_expect_related(exp) == 0) { |
| 1579 | DEBUGP("nf_ct_ras: expect Q.931 "); |
| 1580 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 1581 | } else |
| 1582 | ret = -1; |
| 1583 | |
| 1584 | nf_conntrack_expect_put(exp); |
| 1585 | |
| 1586 | return ret; |
| 1587 | } |
| 1588 | |
| 1589 | /****************************************************************************/ |
| 1590 | static int process_lrq(struct sk_buff **pskb, struct nf_conn *ct, |
| 1591 | enum ip_conntrack_info ctinfo, |
| 1592 | unsigned char **data, LocationRequest *lrq) |
| 1593 | { |
| 1594 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1595 | |
| 1596 | DEBUGP("nf_ct_ras: LRQ\n"); |
| 1597 | |
| 1598 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1599 | if (set_ras_addr && ct->status & IPS_NAT_MASK) |
| 1600 | return set_ras_addr(pskb, ct, ctinfo, data, |
| 1601 | &lrq->replyAddress, 1); |
| 1602 | return 0; |
| 1603 | } |
| 1604 | |
| 1605 | /****************************************************************************/ |
| 1606 | static int process_lcf(struct sk_buff **pskb, struct nf_conn *ct, |
| 1607 | enum ip_conntrack_info ctinfo, |
| 1608 | unsigned char **data, LocationConfirm *lcf) |
| 1609 | { |
| 1610 | int dir = CTINFO2DIR(ctinfo); |
| 1611 | int ret = 0; |
| 1612 | __be16 port; |
| 1613 | union nf_conntrack_address addr; |
| 1614 | struct nf_conntrack_expect *exp; |
| 1615 | |
| 1616 | DEBUGP("nf_ct_ras: LCF\n"); |
| 1617 | |
| 1618 | if (!get_h225_addr(ct, *data, &lcf->callSignalAddress, |
| 1619 | &addr, &port)) |
| 1620 | return 0; |
| 1621 | |
| 1622 | /* Need new expect for call signal */ |
| 1623 | if ((exp = nf_conntrack_expect_alloc(ct)) == NULL) |
| 1624 | return -1; |
| 1625 | nf_conntrack_expect_init(exp, ct->tuplehash[!dir].tuple.src.l3num, |
| 1626 | &ct->tuplehash[!dir].tuple.src.u3, &addr, |
| 1627 | IPPROTO_TCP, NULL, &port); |
| 1628 | exp->flags = NF_CT_EXPECT_PERMANENT; |
| 1629 | exp->helper = nf_conntrack_helper_q931; |
| 1630 | |
| 1631 | if (nf_conntrack_expect_related(exp) == 0) { |
| 1632 | DEBUGP("nf_ct_ras: expect Q.931 "); |
| 1633 | NF_CT_DUMP_TUPLE(&exp->tuple); |
| 1634 | } else |
| 1635 | ret = -1; |
| 1636 | |
| 1637 | nf_conntrack_expect_put(exp); |
| 1638 | |
| 1639 | /* Ignore rasAddress */ |
| 1640 | |
| 1641 | return ret; |
| 1642 | } |
| 1643 | |
| 1644 | /****************************************************************************/ |
| 1645 | static int process_irr(struct sk_buff **pskb, struct nf_conn *ct, |
| 1646 | enum ip_conntrack_info ctinfo, |
| 1647 | unsigned char **data, InfoRequestResponse *irr) |
| 1648 | { |
| 1649 | int ret; |
| 1650 | typeof(set_ras_addr_hook) set_ras_addr; |
| 1651 | typeof(set_sig_addr_hook) set_sig_addr; |
| 1652 | |
| 1653 | DEBUGP("nf_ct_ras: IRR\n"); |
| 1654 | |
| 1655 | set_ras_addr = rcu_dereference(set_ras_addr_hook); |
| 1656 | if (set_ras_addr && ct->status & IPS_NAT_MASK) { |
| 1657 | ret = set_ras_addr(pskb, ct, ctinfo, data, |
| 1658 | &irr->rasAddress, 1); |
| 1659 | if (ret < 0) |
| 1660 | return -1; |
| 1661 | } |
| 1662 | |
| 1663 | set_sig_addr = rcu_dereference(set_sig_addr_hook); |
| 1664 | if (set_sig_addr && ct->status & IPS_NAT_MASK) { |
| 1665 | ret = set_sig_addr(pskb, ct, ctinfo, data, |
| 1666 | irr->callSignalAddress.item, |
| 1667 | irr->callSignalAddress.count); |
| 1668 | if (ret < 0) |
| 1669 | return -1; |
| 1670 | } |
| 1671 | |
| 1672 | return 0; |
| 1673 | } |
| 1674 | |
| 1675 | /****************************************************************************/ |
| 1676 | static int process_ras(struct sk_buff **pskb, struct nf_conn *ct, |
| 1677 | enum ip_conntrack_info ctinfo, |
| 1678 | unsigned char **data, RasMessage *ras) |
| 1679 | { |
| 1680 | switch (ras->choice) { |
| 1681 | case eRasMessage_gatekeeperRequest: |
| 1682 | return process_grq(pskb, ct, ctinfo, data, |
| 1683 | &ras->gatekeeperRequest); |
| 1684 | case eRasMessage_gatekeeperConfirm: |
| 1685 | return process_gcf(pskb, ct, ctinfo, data, |
| 1686 | &ras->gatekeeperConfirm); |
| 1687 | case eRasMessage_registrationRequest: |
| 1688 | return process_rrq(pskb, ct, ctinfo, data, |
| 1689 | &ras->registrationRequest); |
| 1690 | case eRasMessage_registrationConfirm: |
| 1691 | return process_rcf(pskb, ct, ctinfo, data, |
| 1692 | &ras->registrationConfirm); |
| 1693 | case eRasMessage_unregistrationRequest: |
| 1694 | return process_urq(pskb, ct, ctinfo, data, |
| 1695 | &ras->unregistrationRequest); |
| 1696 | case eRasMessage_admissionRequest: |
| 1697 | return process_arq(pskb, ct, ctinfo, data, |
| 1698 | &ras->admissionRequest); |
| 1699 | case eRasMessage_admissionConfirm: |
| 1700 | return process_acf(pskb, ct, ctinfo, data, |
| 1701 | &ras->admissionConfirm); |
| 1702 | case eRasMessage_locationRequest: |
| 1703 | return process_lrq(pskb, ct, ctinfo, data, |
| 1704 | &ras->locationRequest); |
| 1705 | case eRasMessage_locationConfirm: |
| 1706 | return process_lcf(pskb, ct, ctinfo, data, |
| 1707 | &ras->locationConfirm); |
| 1708 | case eRasMessage_infoRequestResponse: |
| 1709 | return process_irr(pskb, ct, ctinfo, data, |
| 1710 | &ras->infoRequestResponse); |
| 1711 | default: |
| 1712 | DEBUGP("nf_ct_ras: RAS message %d\n", ras->choice); |
| 1713 | break; |
| 1714 | } |
| 1715 | |
| 1716 | return 0; |
| 1717 | } |
| 1718 | |
| 1719 | /****************************************************************************/ |
| 1720 | static int ras_help(struct sk_buff **pskb, unsigned int protoff, |
| 1721 | struct nf_conn *ct, enum ip_conntrack_info ctinfo) |
| 1722 | { |
| 1723 | static RasMessage ras; |
| 1724 | unsigned char *data; |
| 1725 | int datalen = 0; |
| 1726 | int ret; |
| 1727 | |
| 1728 | DEBUGP("nf_ct_ras: skblen = %u\n", (*pskb)->len); |
| 1729 | |
| 1730 | spin_lock_bh(&nf_h323_lock); |
| 1731 | |
| 1732 | /* Get UDP data */ |
| 1733 | data = get_udp_data(pskb, protoff, &datalen); |
| 1734 | if (data == NULL) |
| 1735 | goto accept; |
| 1736 | DEBUGP("nf_ct_ras: RAS message len=%d ", datalen); |
| 1737 | NF_CT_DUMP_TUPLE(&ct->tuplehash[CTINFO2DIR(ctinfo)].tuple); |
| 1738 | |
| 1739 | /* Decode RAS message */ |
| 1740 | ret = DecodeRasMessage(data, datalen, &ras); |
| 1741 | if (ret < 0) { |
| 1742 | if (net_ratelimit()) |
| 1743 | printk("nf_ct_ras: decoding error: %s\n", |
| 1744 | ret == H323_ERROR_BOUND ? |
| 1745 | "out of bound" : "out of range"); |
| 1746 | goto accept; |
| 1747 | } |
| 1748 | |
| 1749 | /* Process RAS message */ |
| 1750 | if (process_ras(pskb, ct, ctinfo, &data, &ras) < 0) |
| 1751 | goto drop; |
| 1752 | |
| 1753 | accept: |
| 1754 | spin_unlock_bh(&nf_h323_lock); |
| 1755 | return NF_ACCEPT; |
| 1756 | |
| 1757 | drop: |
| 1758 | spin_unlock_bh(&nf_h323_lock); |
| 1759 | if (net_ratelimit()) |
| 1760 | printk("nf_ct_ras: packet dropped\n"); |
| 1761 | return NF_DROP; |
| 1762 | } |
| 1763 | |
| 1764 | /****************************************************************************/ |
| 1765 | static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = { |
| 1766 | { |
| 1767 | .name = "RAS", |
| 1768 | .me = THIS_MODULE, |
| 1769 | .max_expected = 32, |
| 1770 | .timeout = 240, |
| 1771 | .tuple.src.l3num = AF_INET, |
| 1772 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), |
| 1773 | .tuple.dst.protonum = IPPROTO_UDP, |
| 1774 | .mask.src.l3num = 0xFFFF, |
| 1775 | .mask.src.u.udp.port = __constant_htons(0xFFFF), |
| 1776 | .mask.dst.protonum = 0xFF, |
| 1777 | .help = ras_help, |
| 1778 | }, |
| 1779 | { |
| 1780 | .name = "RAS", |
| 1781 | .me = THIS_MODULE, |
| 1782 | .max_expected = 32, |
| 1783 | .timeout = 240, |
| 1784 | .tuple.src.l3num = AF_INET6, |
| 1785 | .tuple.src.u.udp.port = __constant_htons(RAS_PORT), |
| 1786 | .tuple.dst.protonum = IPPROTO_UDP, |
| 1787 | .mask.src.l3num = 0xFFFF, |
| 1788 | .mask.src.u.udp.port = __constant_htons(0xFFFF), |
| 1789 | .mask.dst.protonum = 0xFF, |
| 1790 | .help = ras_help, |
| 1791 | }, |
| 1792 | }; |
| 1793 | |
| 1794 | /****************************************************************************/ |
| 1795 | static void __exit nf_conntrack_h323_fini(void) |
| 1796 | { |
| 1797 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[1]); |
| 1798 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
| 1799 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
| 1800 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
| 1801 | kfree(h323_buffer); |
| 1802 | DEBUGP("nf_ct_h323: fini\n"); |
| 1803 | } |
| 1804 | |
| 1805 | /****************************************************************************/ |
| 1806 | static int __init nf_conntrack_h323_init(void) |
| 1807 | { |
| 1808 | int ret; |
| 1809 | |
| 1810 | h323_buffer = kmalloc(65536, GFP_KERNEL); |
| 1811 | if (!h323_buffer) |
| 1812 | return -ENOMEM; |
| 1813 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[0]); |
| 1814 | if (ret < 0) |
| 1815 | goto err1; |
| 1816 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_q931[1]); |
| 1817 | if (ret < 0) |
| 1818 | goto err2; |
| 1819 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[0]); |
| 1820 | if (ret < 0) |
| 1821 | goto err3; |
| 1822 | ret = nf_conntrack_helper_register(&nf_conntrack_helper_ras[1]); |
| 1823 | if (ret < 0) |
| 1824 | goto err4; |
| 1825 | DEBUGP("nf_ct_h323: init success\n"); |
| 1826 | return 0; |
| 1827 | |
| 1828 | err4: |
| 1829 | nf_conntrack_helper_unregister(&nf_conntrack_helper_ras[0]); |
| 1830 | err3: |
| 1831 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[1]); |
| 1832 | err2: |
| 1833 | nf_conntrack_helper_unregister(&nf_conntrack_helper_q931[0]); |
| 1834 | err1: |
| 1835 | return ret; |
| 1836 | } |
| 1837 | |
| 1838 | /****************************************************************************/ |
| 1839 | module_init(nf_conntrack_h323_init); |
| 1840 | module_exit(nf_conntrack_h323_fini); |
| 1841 | |
| 1842 | EXPORT_SYMBOL_GPL(get_h225_addr); |
| 1843 | EXPORT_SYMBOL_GPL(set_h245_addr_hook); |
| 1844 | EXPORT_SYMBOL_GPL(set_h225_addr_hook); |
| 1845 | EXPORT_SYMBOL_GPL(set_sig_addr_hook); |
| 1846 | EXPORT_SYMBOL_GPL(set_ras_addr_hook); |
| 1847 | EXPORT_SYMBOL_GPL(nat_rtp_rtcp_hook); |
| 1848 | EXPORT_SYMBOL_GPL(nat_t120_hook); |
| 1849 | EXPORT_SYMBOL_GPL(nat_h245_hook); |
| 1850 | EXPORT_SYMBOL_GPL(nat_callforwarding_hook); |
| 1851 | EXPORT_SYMBOL_GPL(nat_q931_hook); |
| 1852 | |
| 1853 | MODULE_AUTHOR("Jing Min Zhao <zhaojingmin@users.sourceforge.net>"); |
| 1854 | MODULE_DESCRIPTION("H.323 connection tracking helper"); |
| 1855 | MODULE_LICENSE("GPL"); |
| 1856 | MODULE_ALIAS("ip_conntrack_h323"); |