| 1 | /*-
|
|---|
| 2 | * alias_skinny.c
|
|---|
| 3 | *
|
|---|
| 4 | * Copyright (c) 2002, 2003 MarcusCom, Inc.
|
|---|
| 5 | * All rights reserved.
|
|---|
| 6 | *
|
|---|
| 7 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 8 | * modification, are permitted provided that the following conditions
|
|---|
| 9 | * are met:
|
|---|
| 10 | * 1. Redistributions of source code must retain the above copyright
|
|---|
| 11 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 12 | * 2. Redistributions in binary form must reproduce the above copyright
|
|---|
| 13 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 14 | * documentation and/or other materials provided with the distribution.
|
|---|
| 15 | *
|
|---|
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|---|
| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|---|
| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|---|
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|---|
| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|---|
| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|---|
| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|---|
| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|---|
| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|---|
| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|---|
| 26 | * SUCH DAMAGE.
|
|---|
| 27 | *
|
|---|
| 28 | * Author: Joe Marcus Clarke <marcus@FreeBSD.org>
|
|---|
| 29 | *
|
|---|
| 30 | * $FreeBSD: src/sys/netinet/libalias/alias_skinny.c,v 1.14.8.1 2009/04/15 03:14:26 kensmith Exp $
|
|---|
| 31 | */
|
|---|
| 32 |
|
|---|
| 33 | #ifdef _KERNEL
|
|---|
| 34 | #include <sys/param.h>
|
|---|
| 35 | #include <sys/kernel.h>
|
|---|
| 36 | #include <sys/module.h>
|
|---|
| 37 | #else
|
|---|
| 38 | #include <errno.h>
|
|---|
| 39 | #include <stdio.h>
|
|---|
| 40 | #include <unistd.h>
|
|---|
| 41 | #endif
|
|---|
| 42 |
|
|---|
| 43 | #include <netinet/in_systm.h>
|
|---|
| 44 | #include <netinet/in.h>
|
|---|
| 45 | #include <netinet/ip.h>
|
|---|
| 46 | #include <netinet/tcp.h>
|
|---|
| 47 |
|
|---|
| 48 | #ifdef _KERNEL
|
|---|
| 49 | #include <netinet/libalias/alias_local.h>
|
|---|
| 50 | #include <netinet/libalias/alias_mod.h>
|
|---|
| 51 | #else
|
|---|
| 52 | #include "alias_local.h"
|
|---|
| 53 | #include "alias_mod.h"
|
|---|
| 54 | #endif
|
|---|
| 55 |
|
|---|
| 56 | static void
|
|---|
| 57 | AliasHandleSkinny(struct libalias *, struct ip *, struct alias_link *);
|
|---|
| 58 |
|
|---|
| 59 | static int
|
|---|
| 60 | fingerprint(struct libalias *la, struct ip *pip, struct alias_data *ah)
|
|---|
| 61 | {
|
|---|
| 62 |
|
|---|
| 63 | if (ah->dport == NULL || ah->sport == NULL || ah->lnk == NULL)
|
|---|
| 64 | return (-1);
|
|---|
| 65 | if (la->skinnyPort != 0 && (ntohs(*ah->sport) == la->skinnyPort ||
|
|---|
| 66 | ntohs(*ah->dport) == la->skinnyPort))
|
|---|
| 67 | return (0);
|
|---|
| 68 | return (-1);
|
|---|
| 69 | }
|
|---|
| 70 |
|
|---|
| 71 | static int
|
|---|
| 72 | protohandler(struct libalias *la, struct ip *pip, struct alias_data *ah)
|
|---|
| 73 | {
|
|---|
| 74 |
|
|---|
| 75 | AliasHandleSkinny(la, pip, ah->lnk);
|
|---|
| 76 | return (0);
|
|---|
| 77 | }
|
|---|
| 78 |
|
|---|
| 79 | struct proto_handler handlers[] = {
|
|---|
| 80 | {
|
|---|
| 81 | .pri = 110,
|
|---|
| 82 | .dir = IN|OUT,
|
|---|
| 83 | .proto = TCP,
|
|---|
| 84 | .fingerprint = &fingerprint,
|
|---|
| 85 | .protohandler = &protohandler
|
|---|
| 86 | },
|
|---|
| 87 | { EOH }
|
|---|
| 88 | };
|
|---|
| 89 |
|
|---|
| 90 | static int
|
|---|
| 91 | mod_handler(module_t mod, int type, void *data)
|
|---|
| 92 | {
|
|---|
| 93 | int error;
|
|---|
| 94 |
|
|---|
| 95 | switch (type) {
|
|---|
| 96 | case MOD_LOAD:
|
|---|
| 97 | error = 0;
|
|---|
| 98 | LibAliasAttachHandlers(handlers);
|
|---|
| 99 | break;
|
|---|
| 100 | case MOD_UNLOAD:
|
|---|
| 101 | error = 0;
|
|---|
| 102 | LibAliasDetachHandlers(handlers);
|
|---|
| 103 | break;
|
|---|
| 104 | default:
|
|---|
| 105 | error = EINVAL;
|
|---|
| 106 | }
|
|---|
| 107 | return (error);
|
|---|
| 108 | }
|
|---|
| 109 |
|
|---|
| 110 | #ifdef _KERNEL
|
|---|
| 111 | static
|
|---|
| 112 | #endif
|
|---|
| 113 | moduledata_t alias_mod = {
|
|---|
| 114 | "alias_skinny", mod_handler, NULL
|
|---|
| 115 | };
|
|---|
| 116 |
|
|---|
| 117 | #ifdef _KERNEL
|
|---|
| 118 | DECLARE_MODULE(alias_skinny, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
|
|---|
| 119 | MODULE_VERSION(alias_skinny, 1);
|
|---|
| 120 | MODULE_DEPEND(alias_skinny, libalias, 1, 1, 1);
|
|---|
| 121 | #endif
|
|---|
| 122 |
|
|---|
| 123 | /*
|
|---|
| 124 | * alias_skinny.c handles the translation for the Cisco Skinny Station
|
|---|
| 125 | * protocol. Skinny typically uses TCP port 2000 to set up calls between
|
|---|
| 126 | * a Cisco Call Manager and a Cisco IP phone. When a phone comes on line,
|
|---|
| 127 | * it first needs to register with the Call Manager. To do this it sends
|
|---|
| 128 | * a registration message. This message contains the IP address of the
|
|---|
| 129 | * IP phone. This message must then be translated to reflect our global
|
|---|
| 130 | * IP address. Along with the registration message (and usually in the
|
|---|
| 131 | * same packet), the phone sends an IP port message. This message indicates
|
|---|
| 132 | * the TCP port over which it will communicate.
|
|---|
| 133 | *
|
|---|
| 134 | * When a call is placed from the phone, the Call Manager will send an
|
|---|
| 135 | * Open Receive Channel message to the phone to let the caller know someone
|
|---|
| 136 | * has answered. The phone then sends back an Open Receive Channel
|
|---|
| 137 | * Acknowledgement. In this packet, the phone sends its IP address again,
|
|---|
| 138 | * and the UDP port over which the voice traffic should flow. These values
|
|---|
| 139 | * need translation. Right after the Open Receive Channel Acknowledgement,
|
|---|
| 140 | * the Call Manager sends a Start Media Transmission message indicating the
|
|---|
| 141 | * call is connected. This message contains the IP address and UDP port
|
|---|
| 142 | * number of the remote (called) party. Once this message is translated, the
|
|---|
| 143 | * call can commence. The called part sends the first UDP packet to the
|
|---|
| 144 | * calling phone at the pre-arranged UDP port in the Open Receive Channel
|
|---|
| 145 | * Acknowledgement.
|
|---|
| 146 | *
|
|---|
| 147 | * Skinny is a Cisco-proprietary protocol and is a trademark of Cisco Systems,
|
|---|
| 148 | * Inc. All rights reserved.
|
|---|
| 149 | */
|
|---|
| 150 |
|
|---|
| 151 | /* #define LIBALIAS_DEBUG 1 */
|
|---|
| 152 |
|
|---|
| 153 | /* Message types that need translating */
|
|---|
| 154 | #define REG_MSG 0x00000001
|
|---|
| 155 | #define IP_PORT_MSG 0x00000002
|
|---|
| 156 | #define OPNRCVCH_ACK 0x00000022
|
|---|
| 157 | #define START_MEDIATX 0x0000008a
|
|---|
| 158 |
|
|---|
| 159 | struct skinny_header {
|
|---|
| 160 | u_int32_t len;
|
|---|
| 161 | u_int32_t reserved;
|
|---|
| 162 | u_int32_t msgId;
|
|---|
| 163 | };
|
|---|
| 164 |
|
|---|
| 165 | struct RegisterMessage {
|
|---|
| 166 | u_int32_t msgId;
|
|---|
| 167 | char devName [16];
|
|---|
| 168 | u_int32_t uid;
|
|---|
| 169 | u_int32_t instance;
|
|---|
| 170 | u_int32_t ipAddr;
|
|---|
| 171 | u_char devType;
|
|---|
| 172 | u_int32_t maxStreams;
|
|---|
| 173 | };
|
|---|
| 174 |
|
|---|
| 175 | struct IpPortMessage {
|
|---|
| 176 | u_int32_t msgId;
|
|---|
| 177 | u_int32_t stationIpPort; /* Note: Skinny uses 32-bit port
|
|---|
| 178 | * numbers */
|
|---|
| 179 | };
|
|---|
| 180 |
|
|---|
| 181 | struct OpenReceiveChannelAck {
|
|---|
| 182 | u_int32_t msgId;
|
|---|
| 183 | u_int32_t status;
|
|---|
| 184 | u_int32_t ipAddr;
|
|---|
| 185 | u_int32_t port;
|
|---|
| 186 | u_int32_t passThruPartyID;
|
|---|
| 187 | };
|
|---|
| 188 |
|
|---|
| 189 | struct StartMediaTransmission {
|
|---|
| 190 | u_int32_t msgId;
|
|---|
| 191 | u_int32_t conferenceID;
|
|---|
| 192 | u_int32_t passThruPartyID;
|
|---|
| 193 | u_int32_t remoteIpAddr;
|
|---|
| 194 | u_int32_t remotePort;
|
|---|
| 195 | u_int32_t MSPacket;
|
|---|
| 196 | u_int32_t payloadCap;
|
|---|
| 197 | u_int32_t precedence;
|
|---|
| 198 | u_int32_t silenceSuppression;
|
|---|
| 199 | u_short maxFramesPerPacket;
|
|---|
| 200 | u_int32_t G723BitRate;
|
|---|
| 201 | };
|
|---|
| 202 |
|
|---|
| 203 | typedef enum {
|
|---|
| 204 | ClientToServer = 0,
|
|---|
| 205 | ServerToClient = 1
|
|---|
| 206 | } ConvDirection;
|
|---|
| 207 |
|
|---|
| 208 |
|
|---|
| 209 | static int
|
|---|
| 210 | alias_skinny_reg_msg(struct RegisterMessage *reg_msg, struct ip *pip,
|
|---|
| 211 | struct tcphdr *tc, struct alias_link *lnk,
|
|---|
| 212 | ConvDirection direction)
|
|---|
| 213 | {
|
|---|
| 214 | (void)direction;
|
|---|
| 215 |
|
|---|
| 216 | reg_msg->ipAddr = (u_int32_t) GetAliasAddress(lnk).s_addr;
|
|---|
| 217 |
|
|---|
| 218 | tc->th_sum = 0;
|
|---|
| 219 | #ifdef _KERNEL
|
|---|
| 220 | tc->th_x2 = 1;
|
|---|
| 221 | #else
|
|---|
| 222 | tc->th_sum = TcpChecksum(pip);
|
|---|
| 223 | #endif
|
|---|
| 224 |
|
|---|
| 225 | return (0);
|
|---|
| 226 | }
|
|---|
| 227 |
|
|---|
| 228 | static int
|
|---|
| 229 | alias_skinny_startmedia(struct StartMediaTransmission *start_media,
|
|---|
| 230 | struct ip *pip, struct tcphdr *tc,
|
|---|
| 231 | struct alias_link *lnk, u_int32_t localIpAddr,
|
|---|
| 232 | ConvDirection direction)
|
|---|
| 233 | {
|
|---|
| 234 | struct in_addr dst, src;
|
|---|
| 235 |
|
|---|
| 236 | (void)pip;
|
|---|
| 237 | (void)tc;
|
|---|
| 238 | (void)lnk;
|
|---|
| 239 | (void)direction;
|
|---|
| 240 |
|
|---|
| 241 | dst.s_addr = start_media->remoteIpAddr;
|
|---|
| 242 | src.s_addr = localIpAddr;
|
|---|
| 243 |
|
|---|
| 244 | /*
|
|---|
| 245 | * XXX I should probably handle in bound global translations as
|
|---|
| 246 | * well.
|
|---|
| 247 | */
|
|---|
| 248 |
|
|---|
| 249 | return (0);
|
|---|
| 250 | }
|
|---|
| 251 |
|
|---|
| 252 | static int
|
|---|
| 253 | alias_skinny_port_msg(struct IpPortMessage *port_msg, struct ip *pip,
|
|---|
| 254 | struct tcphdr *tc, struct alias_link *lnk,
|
|---|
| 255 | ConvDirection direction)
|
|---|
| 256 | {
|
|---|
| 257 | (void)direction;
|
|---|
| 258 |
|
|---|
| 259 | port_msg->stationIpPort = (u_int32_t) ntohs(GetAliasPort(lnk));
|
|---|
| 260 |
|
|---|
| 261 | tc->th_sum = 0;
|
|---|
| 262 | #ifdef _KERNEL
|
|---|
| 263 | tc->th_x2 = 1;
|
|---|
| 264 | #else
|
|---|
| 265 | tc->th_sum = TcpChecksum(pip);
|
|---|
| 266 | #endif
|
|---|
| 267 | return (0);
|
|---|
| 268 | }
|
|---|
| 269 |
|
|---|
| 270 | static int
|
|---|
| 271 | alias_skinny_opnrcvch_ack(struct libalias *la, struct OpenReceiveChannelAck *opnrcvch_ack,
|
|---|
| 272 | struct ip *pip, struct tcphdr *tc,
|
|---|
| 273 | struct alias_link *lnk, u_int32_t * localIpAddr,
|
|---|
| 274 | ConvDirection direction)
|
|---|
| 275 | {
|
|---|
| 276 | struct in_addr null_addr;
|
|---|
| 277 | struct alias_link *opnrcv_lnk;
|
|---|
| 278 | u_int32_t localPort;
|
|---|
| 279 |
|
|---|
| 280 | (void)lnk;
|
|---|
| 281 | (void)direction;
|
|---|
| 282 |
|
|---|
| 283 | *localIpAddr = (u_int32_t) opnrcvch_ack->ipAddr;
|
|---|
| 284 | localPort = opnrcvch_ack->port;
|
|---|
| 285 |
|
|---|
| 286 | null_addr.s_addr = INADDR_ANY;
|
|---|
| 287 | opnrcv_lnk = FindUdpTcpOut(la, pip->ip_src, null_addr,
|
|---|
| 288 | htons((u_short) opnrcvch_ack->port), 0,
|
|---|
| 289 | IPPROTO_UDP, 1);
|
|---|
| 290 | opnrcvch_ack->ipAddr = (u_int32_t) GetAliasAddress(opnrcv_lnk).s_addr;
|
|---|
| 291 | opnrcvch_ack->port = (u_int32_t) ntohs(GetAliasPort(opnrcv_lnk));
|
|---|
| 292 |
|
|---|
| 293 | tc->th_sum = 0;
|
|---|
| 294 | #ifdef _KERNEL
|
|---|
| 295 | tc->th_x2 = 1;
|
|---|
| 296 | #else
|
|---|
| 297 | tc->th_sum = TcpChecksum(pip);
|
|---|
| 298 | #endif
|
|---|
| 299 | return (0);
|
|---|
| 300 | }
|
|---|
| 301 |
|
|---|
| 302 | static void
|
|---|
| 303 | AliasHandleSkinny(struct libalias *la, struct ip *pip, struct alias_link *lnk)
|
|---|
| 304 | {
|
|---|
| 305 | size_t hlen, tlen, dlen;
|
|---|
| 306 | struct tcphdr *tc;
|
|---|
| 307 | u_int32_t msgId, t, len, lip;
|
|---|
| 308 | struct skinny_header *sd;
|
|---|
| 309 | size_t orig_len, skinny_hdr_len = sizeof(struct skinny_header);
|
|---|
| 310 | ConvDirection direction;
|
|---|
| 311 |
|
|---|
| 312 | lip = -1;
|
|---|
| 313 | tc = (struct tcphdr *)ip_next(pip);
|
|---|
| 314 | hlen = (pip->ip_hl + tc->th_off) << 2;
|
|---|
| 315 | tlen = ntohs(pip->ip_len);
|
|---|
| 316 | dlen = tlen - hlen;
|
|---|
| 317 |
|
|---|
| 318 | sd = (struct skinny_header *)tcp_next(tc);
|
|---|
| 319 |
|
|---|
| 320 | /*
|
|---|
| 321 | * XXX This direction is reserved for future use. I still need to
|
|---|
| 322 | * handle the scenario where the call manager is on the inside, and
|
|---|
| 323 | * the calling phone is on the global outside.
|
|---|
| 324 | */
|
|---|
| 325 | if (ntohs(tc->th_dport) == la->skinnyPort) {
|
|---|
| 326 | direction = ClientToServer;
|
|---|
| 327 | } else if (ntohs(tc->th_sport) == la->skinnyPort) {
|
|---|
| 328 | direction = ServerToClient;
|
|---|
| 329 | } else {
|
|---|
| 330 | #ifdef LIBALIAS_DEBUG
|
|---|
| 331 | fprintf(stderr,
|
|---|
| 332 | "PacketAlias/Skinny: Invalid port number, not a Skinny packet\n");
|
|---|
| 333 | #endif
|
|---|
| 334 | return;
|
|---|
| 335 | }
|
|---|
| 336 |
|
|---|
| 337 | orig_len = dlen;
|
|---|
| 338 | /*
|
|---|
| 339 | * Skinny packets can contain many messages. We need to loop
|
|---|
| 340 | * through the packet using len to determine message boundaries.
|
|---|
| 341 | * This comes into play big time with port messages being in the
|
|---|
| 342 | * same packet as register messages. Also, open receive channel
|
|---|
| 343 | * acks are usually buried in a pakcet some 400 bytes long.
|
|---|
| 344 | */
|
|---|
| 345 | while (dlen >= skinny_hdr_len) {
|
|---|
| 346 | len = (sd->len);
|
|---|
| 347 | msgId = (sd->msgId);
|
|---|
| 348 | t = len;
|
|---|
| 349 |
|
|---|
| 350 | if (t > orig_len || t > dlen) {
|
|---|
| 351 | #ifdef LIBALIAS_DEBUG
|
|---|
| 352 | fprintf(stderr,
|
|---|
| 353 | "PacketAlias/Skinny: Not a skinny packet, invalid length \n");
|
|---|
| 354 | #endif
|
|---|
| 355 | return;
|
|---|
| 356 | }
|
|---|
| 357 | switch (msgId) {
|
|---|
| 358 | case REG_MSG: {
|
|---|
| 359 | struct RegisterMessage *reg_mesg;
|
|---|
| 360 |
|
|---|
| 361 | if (len < (int)sizeof(struct RegisterMessage)) {
|
|---|
| 362 | #ifdef LIBALIAS_DEBUG
|
|---|
| 363 | fprintf(stderr,
|
|---|
| 364 | "PacketAlias/Skinny: Not a skinny packet, bad registration message\n");
|
|---|
| 365 | #endif
|
|---|
| 366 | return;
|
|---|
| 367 | }
|
|---|
| 368 | reg_mesg = (struct RegisterMessage *)&sd->msgId;
|
|---|
| 369 | #ifdef LIBALIAS_DEBUG
|
|---|
| 370 | fprintf(stderr,
|
|---|
| 371 | "PacketAlias/Skinny: Received a register message");
|
|---|
| 372 | #endif
|
|---|
| 373 | alias_skinny_reg_msg(reg_mesg, pip, tc, lnk, direction);
|
|---|
| 374 | break;
|
|---|
| 375 | }
|
|---|
| 376 | case IP_PORT_MSG: {
|
|---|
| 377 | struct IpPortMessage *port_mesg;
|
|---|
| 378 |
|
|---|
| 379 | if (len < (int)sizeof(struct IpPortMessage)) {
|
|---|
| 380 | #ifdef LIBALIAS_DEBUG
|
|---|
| 381 | fprintf(stderr,
|
|---|
| 382 | "PacketAlias/Skinny: Not a skinny packet, port message\n");
|
|---|
| 383 | #endif
|
|---|
| 384 | return;
|
|---|
| 385 | }
|
|---|
| 386 | #ifdef LIBALIAS_DEBUG
|
|---|
| 387 | fprintf(stderr,
|
|---|
| 388 | "PacketAlias/Skinny: Received ipport message\n");
|
|---|
| 389 | #endif
|
|---|
| 390 | port_mesg = (struct IpPortMessage *)&sd->msgId;
|
|---|
| 391 | alias_skinny_port_msg(port_mesg, pip, tc, lnk, direction);
|
|---|
| 392 | break;
|
|---|
| 393 | }
|
|---|
| 394 | case OPNRCVCH_ACK: {
|
|---|
| 395 | struct OpenReceiveChannelAck *opnrcvchn_ack;
|
|---|
| 396 |
|
|---|
| 397 | if (len < (int)sizeof(struct OpenReceiveChannelAck)) {
|
|---|
| 398 | #ifdef LIBALIAS_DEBUG
|
|---|
| 399 | fprintf(stderr,
|
|---|
| 400 | "PacketAlias/Skinny: Not a skinny packet, packet,OpnRcvChnAckMsg\n");
|
|---|
| 401 | #endif
|
|---|
| 402 | return;
|
|---|
| 403 | }
|
|---|
| 404 | #ifdef LIBALIAS_DEBUG
|
|---|
| 405 | fprintf(stderr,
|
|---|
| 406 | "PacketAlias/Skinny: Received open rcv channel msg\n");
|
|---|
| 407 | #endif
|
|---|
| 408 | opnrcvchn_ack = (struct OpenReceiveChannelAck *)&sd->msgId;
|
|---|
| 409 | alias_skinny_opnrcvch_ack(la, opnrcvchn_ack, pip, tc, lnk, &lip, direction);
|
|---|
| 410 | break;
|
|---|
| 411 | }
|
|---|
| 412 | case START_MEDIATX: {
|
|---|
| 413 | struct StartMediaTransmission *startmedia_tx;
|
|---|
| 414 |
|
|---|
| 415 | if (len < (int)sizeof(struct StartMediaTransmission)) {
|
|---|
| 416 | #ifdef LIBALIAS_DEBUG
|
|---|
| 417 | fprintf(stderr,
|
|---|
| 418 | "PacketAlias/Skinny: Not a skinny packet,StartMediaTx Message\n");
|
|---|
| 419 | #endif
|
|---|
| 420 | return;
|
|---|
| 421 | }
|
|---|
| 422 | if (lip == -1) {
|
|---|
| 423 | #ifdef LIBALIAS_DEBUG
|
|---|
| 424 | fprintf(stderr,
|
|---|
| 425 | "PacketAlias/Skinny: received a"
|
|---|
| 426 | " packet,StartMediaTx Message before"
|
|---|
| 427 | " packet,OpnRcvChnAckMsg\n"
|
|---|
| 428 | #endif
|
|---|
| 429 | return;
|
|---|
| 430 | }
|
|---|
| 431 |
|
|---|
| 432 | #ifdef LIBALIAS_DEBUG
|
|---|
| 433 | fprintf(stderr,
|
|---|
| 434 | "PacketAlias/Skinny: Received start media trans msg\n");
|
|---|
| 435 | #endif
|
|---|
| 436 | startmedia_tx = (struct StartMediaTransmission *)&sd->msgId;
|
|---|
| 437 | alias_skinny_startmedia(startmedia_tx, pip, tc, lnk, lip, direction);
|
|---|
| 438 | break;
|
|---|
| 439 | }
|
|---|
| 440 | default:
|
|---|
| 441 | break;
|
|---|
| 442 | }
|
|---|
| 443 | /* Place the pointer at the next message in the packet. */
|
|---|
| 444 | dlen -= len + (skinny_hdr_len - sizeof(msgId));
|
|---|
| 445 | sd = (struct skinny_header *)(((char *)&sd->msgId) + len);
|
|---|
| 446 | }
|
|---|
| 447 | }
|
|---|
