epan/dissectors/packet-itdm.c

   1 /* packet-itdm.c
   2  * Routines for I-TDM (Internal TDM) dissection
   3  * Compliant to PICMG SFP.0 and SFP.1 March 24, 2005
   4  *
   5  * Copyright 2008, Dan Gora <dg [AT] adax.com>
   6  *
   7  * $Id$
   8  *
   9  * Wireshark - Network traffic analyzer
  10  * By Gerald Combs <gerald@wireshark.org>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  26  */
  27
  28 #include "config.h"
  29
  30 #include <glib.h>
  31 #include <epan/packet.h>
  32 #include <epan/prefs.h>
  33
  34 /* Initialize the protocol and registered fields */
  35 static int proto_itdm        = -1;
  36 static int hf_itdm_timestamp = -1;
  37 static int hf_itdm_seqnum    = -1;
  38 static int hf_itdm_sop_eop   = -1;
  39 static int hf_itdm_last_pack = -1;
  40 static int hf_itdm_pktlen    = -1;
  41 static int hf_itdm_chksum    = -1;
  42 static int hf_itdm_uid       = -1;
  43 static int hf_itdm_ack       = -1;
  44 static int hf_itdm_act       = -1;
  45 static int hf_itdm_chcmd     = -1;
  46 static int hf_itdm_chid      = -1;
  47 static int hf_itdm_chloc1    = -1;
  48 static int hf_itdm_chloc2    = -1;
  49 static int hf_itdm_pktrate   = -1;
  50 static int hf_itdm_cxnsize   = -1;
  51
  52 /* I-TDM control protocol fields */
  53 static int hf_itdm_ctl_transid   = -1;
  54 static int hf_itdm_ctl_command   = -1;
  55 static int hf_itdm_ctl_flowid    = -1;
  56 static int hf_itdm_ctl_dm        = -1;
  57 static int hf_itdm_ctl_emts      = -1;
  58 static int hf_itdm_ctl_pktrate   = -1;
  59 static int hf_itdm_ctl_ptid      = -1;
  60 static int hf_itdm_ctl_cksum     = -1;
  61
  62
  63 /* Initialize the subtree pointers */
  64 static gint ett_itdm       = -1;
  65 static gint ett_itdm_ctl   = -1;
  66
  67 /* ZZZZ some magic number.. */
  68 static guint gbl_ItdmMPLSLabel = 0x99887;
  69 static guint gbl_ItdmCTLFlowNo = 0;
  70
  71 static dissector_handle_t data_handle;
  72
  73 /* I-TDM 125usec mode commands for data flows */
  74 #define ITDM_CMD_NEW_CHAN     1
  75 #define ITDM_CMD_CLOSE_CHAN   2
  76 #define ITDM_CMD_RELOC_CHAN   3
  77 #define ITDM_CMD_CYCLIC_REAF  4
  78 #define ITDM_CMD_PACKET_RATE  5
  79
  80 #define ITDM_FLOWID_OFFSET    7
  81 #define ITDM_CHCMD_OFFSET    10
  82 #define ITDM_CHANID_OFFSET   11
  83 #define ITDM_CHLOC1_OFFSET   14
  84 #define ITDM_CHLOC2_OFFSET   16
  85
  86 /* I-TDM commands for I-TDM control flows */
  87 #define ITDM_CTL_TRANSID_OFFSET    10
  88 #define ITDM_CTL_CMD_OFFSET        14
  89 #define ITDM_CTL_FLOWID_OFFSET     15
  90 #define ITDM_CTL_ITDM_MODE_OFFSET  18
  91 #define ITDM_CTL_EMTS_OFFSET       20
  92 #define ITDM_CTL_PKTRATE_OFFSET    22
  93 #define ITDM_CTL_PAIRED_TRANSID_OFFSET    26
  94 #define ITDM_CTL_CRC_OFFSET        30
  95
  96 #define ITDM_CTL_CMD_AFI_REQ  1
  97
  98 static const value_string sop_eop_vals[] = {
  99         { 0x0, "Middle of Packet" },
 100         { 0x1, "End of Packet" },
 101         { 0x2, "Start of Packet" },
 102         { 0x3, "Complete Packet" },
 103         { 0, NULL }
 104 };
 105
 106 static const true_false_string ack_tfs = {
 107         "Acknowledging a command from remote node",
 108         "Normal Command"
 109 };
 110
 111 static const value_string chcmd_vals[] = {
 112         { 0x0, "Reserved" },
 113         { 0x1, "New Channel ID" },
 114         { 0x2, "Close Channel ID" },
 115         { 0x3, "Relocate Channel ID" },
 116         { 0x4, "Cyclic Reaffirmation" },
 117         { 0x5, "Packet Rate Integrity Check" },
 118         { 0x6, "Reserved" },
 119         { 0x7, "Reserved" },
 120         { 0x8, "Reserved" },
 121         { 0x9, "Reserved" },
 122         { 0xa, "Reserved" },
 123         { 0xb, "Reserved" },
 124         { 0xc, "Reserved" },
 125         { 0xd, "Reserved" },
 126         { 0xe, "Reserved" },
 127         { 0xf, "Reserved" },
 128         { 0, NULL }
 129 };
 130
 131 static const value_string itdm_ctl_command_vals[] = {
 132         { 0x0, "Not Used" },
 133         { 0x1, "AFI_REQ: Alloc Flow ID Req" },
 134         { 0x2, "AFI_RSP: Alloc Flow ID Rsp - Req Accepted." },
 135         { 0x3, "DFI_REQ: Dealloc Flow ID Req" },
 136         { 0x4, "DFI_RSP: Dealloc Flow ID Rsp - Req Accepted." },
 137
 138         { 0x10, "AFI_RSP: Reject: Data Mode Field value Not Supported." },
 139         { 0x11, "AFI_RSP: Reject: Explicit Multi-timeslot value Not Supported." },
 140         { 0x12, "AFI_RSP: Reject: Packet Rate value Not Supported." },
 141         { 0x13, "AFI_RSP: Reject: Checksum Invalid." },
 142         { 0x14, "AFI_RSP: Reject: No more flows available." },
 143
 144         { 0x20, "DFI_RSP: Reject: Data Mode Field value does not match Flow ID." },
 145         { 0x21, "DFI_RSP: Reject: Explicit Multi-timeslots value does not match." },
 146         { 0x22, "DFI_RSP: Reject: Packet Rate value does not match." },
 147         { 0x23, "DFI_RSP: Reject: Checksum Invalid." },
 148         { 0x24, "DFI_RSP: Reject: Flow ID invalid (out of range)." },
 149         { 0x25, "DFI_RSP: Reject: Flow ID not currently allocated." },
 150         { 0x26, "DFI_RSP: Reject: Other Flow ID in pair has active connections." },
 151         { 0, NULL }
 152 };
 153
 154 static const value_string itdm_ctl_data_mode_vals[] = {
 155         { 0, "Not Used." },
 156         { 1, "I-TDM 1ms Data Mode." },
 157         { 2, "I-TDM 125usec Data Mode." },
 158         { 3, "I-TDM Explicit Multi-timeslot Data Mode." },
 159         { 4, "I-TDM CAS Signaling Data Mode." },
 160         { 0, NULL }
 161 };
 162
 163 static const value_string itdm_ctl_pktrate_vals[] = {
 164         { 0x447A0000, "I-TDM 1ms Data Mode." },
 165         { 0x45FA0000, "I-TDM 125usec/EMTS Data Mode." },
 166         { 0x43A6AAAB, "I-TDM T1 CAS Mode." },
 167         { 0x43FA0000, "I-TDM E1 CAS Mode." },
 168         { 0, NULL }
 169 };
 170
 171 static void
 172 dissect_itdm_125usec(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 173 {
 174   tvbuff_t      *next_tvb;
 175   proto_item *itdm_item = NULL;
 176   proto_tree *itdm_tree = NULL;
 177   int offset;
 178   guint32 flowid;
 179   guint32 chanid;
 180   guint16 chloc1;
 181   guint16 chloc2;
 182   guint8 chcmd;
 183   guint8 actbit;
 184   guint8 ackbit;
 185
 186
 187   col_set_str(pinfo->cinfo, COL_PROTOCOL, "ITDM");
 188
 189   flowid = tvb_get_ntoh24(tvb, ITDM_FLOWID_OFFSET);
 190   chanid = tvb_get_ntoh24(tvb, ITDM_CHANID_OFFSET);
 191   chcmd  = tvb_get_guint8(tvb, ITDM_CHCMD_OFFSET);
 192   chloc1 = tvb_get_ntohs(tvb, ITDM_CHLOC1_OFFSET);
 193   actbit = (chcmd & 0x10) ? 1 : 0;
 194   ackbit = (chcmd & 0x20) ? 1 : 0;
 195   chcmd  = chcmd & 0x0f;
 196
 197   col_add_fstr(pinfo->cinfo, COL_INFO,
 198       "Flow %d Chan %d ACT %d ACK %d %s",
 199       flowid, chanid, actbit, ackbit,
 200       val_to_str_const(chcmd, chcmd_vals, "Reserved"));
 201   if (chcmd == ITDM_CMD_NEW_CHAN ||
 202       chcmd == ITDM_CMD_CLOSE_CHAN ||
 203       chcmd == ITDM_CMD_CYCLIC_REAF)
 204   {
 205     col_append_fstr(pinfo->cinfo, COL_INFO,
 206         " Loc1 %d", chloc1);
 207   }
 208   else if (chcmd == ITDM_CMD_RELOC_CHAN)
 209   {
 210     chloc2 = tvb_get_ntohs(tvb, ITDM_CHLOC2_OFFSET);
 211     col_append_fstr(pinfo->cinfo, COL_INFO,
 212       " Loc1 %d Loc2 %d", chloc1, chloc2);
 213   }
 214
 215   offset = 0;
 216
 217   if (tree)
 218   {
 219         itdm_item = proto_tree_add_item(tree, proto_itdm, tvb, 0, -1, ENC_NA);
 220         itdm_tree = proto_item_add_subtree(itdm_item, ett_itdm);
 221
 222         proto_tree_add_item(itdm_tree, hf_itdm_timestamp, tvb, offset, 2, ENC_BIG_ENDIAN);
 223         offset += 2;
 224         proto_tree_add_item(itdm_tree, hf_itdm_seqnum, tvb, offset, 1, ENC_BIG_ENDIAN);
 225         offset += 1;
 226         proto_tree_add_item(itdm_tree, hf_itdm_sop_eop, tvb, offset, 1, ENC_BIG_ENDIAN);
 227         proto_tree_add_item(itdm_tree, hf_itdm_last_pack, tvb, offset, 1, ENC_BIG_ENDIAN);
 228         proto_tree_add_item(itdm_tree, hf_itdm_pktlen, tvb, offset, 2, ENC_BIG_ENDIAN);
 229         offset += 2;
 230         proto_tree_add_item(itdm_tree, hf_itdm_chksum, tvb, offset, 2, ENC_BIG_ENDIAN);
 231         offset += 2;
 232         proto_tree_add_item(itdm_tree, hf_itdm_uid, tvb, offset, 3, ENC_BIG_ENDIAN);
 233         offset += 3;
 234         proto_tree_add_item(itdm_tree, hf_itdm_ack, tvb, offset, 1, ENC_BIG_ENDIAN);
 235         proto_tree_add_item(itdm_tree, hf_itdm_act, tvb, offset, 1, ENC_BIG_ENDIAN);
 236         proto_tree_add_item(itdm_tree, hf_itdm_chcmd, tvb, offset, 1, ENC_BIG_ENDIAN);
 237         offset += 1;
 238         proto_tree_add_item(itdm_tree, hf_itdm_chid, tvb, offset, 3, ENC_BIG_ENDIAN);
 239         offset += 3;
 240         if (chcmd == ITDM_CMD_PACKET_RATE)
 241         {
 242                 proto_tree_add_item(itdm_tree, hf_itdm_pktrate, tvb, offset, 4, ENC_BIG_ENDIAN);
 243                 offset += 4;
 244         }
 245         else
 246         {
 247                 proto_tree_add_item(itdm_tree, hf_itdm_chloc1, tvb, offset, 2, ENC_BIG_ENDIAN);
 248                 offset += 2;
 249                 if (chcmd == ITDM_CMD_CYCLIC_REAF ||
 250                     chcmd == ITDM_CMD_NEW_CHAN ||
 251                     chcmd == ITDM_CMD_CLOSE_CHAN)
 252                 {
 253                         proto_tree_add_item(itdm_tree, hf_itdm_cxnsize, tvb, offset, 2, ENC_BIG_ENDIAN);
 254                         offset += 2;
 255                 }
 256                 else
 257                 {
 258                         proto_tree_add_item(itdm_tree, hf_itdm_chloc2, tvb, offset, 2, ENC_BIG_ENDIAN);
 259                         offset += 2;
 260                 }
 261         }
 262   }
 263
 264   next_tvb = tvb_new_subset_remaining(tvb, offset);
 265   call_dissector(data_handle, next_tvb, pinfo, tree);
 266 }
 267
 268 static void
 269 dissect_itdm_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 270 {
 271   tvbuff_t      *next_tvb;
 272   proto_item *itdm_ctl_item = NULL;
 273   proto_tree *itdm_ctl_tree = NULL;
 274   int offset;
 275   guint32 flowid;
 276   guint8 command;
 277   guint32 trans_id;
 278   guint32 paired_trans_id;
 279   guint32 allocd_flowid;
 280
 281   col_set_str(pinfo->cinfo, COL_PROTOCOL, "ITDM-Control");
 282
 283   flowid = tvb_get_ntoh24(tvb, ITDM_FLOWID_OFFSET);
 284   command = tvb_get_guint8(tvb, ITDM_CTL_CMD_OFFSET);
 285   allocd_flowid = tvb_get_ntoh24(tvb, ITDM_CTL_FLOWID_OFFSET);
 286   trans_id = tvb_get_ntohl(tvb, ITDM_CTL_TRANSID_OFFSET);
 287   paired_trans_id = tvb_get_ntohl(tvb, ITDM_CTL_PAIRED_TRANSID_OFFSET);
 288
 289   col_add_fstr(pinfo->cinfo, COL_INFO,
 290       "Flow %d Command %s ",
 291       flowid, val_to_str_const(command, itdm_ctl_command_vals, "Reserved"));
 292
 293   if (command != ITDM_CTL_CMD_AFI_REQ )
 294   {
 295     col_append_fstr(pinfo->cinfo, COL_INFO,
 296         " Alloc'd FlowID %d", allocd_flowid);
 297   }
 298
 299   col_append_fstr(pinfo->cinfo, COL_INFO, " TransID 0x%x ", trans_id);
 300
 301   if (command != ITDM_CTL_CMD_AFI_REQ )
 302   {
 303     col_append_fstr(pinfo->cinfo, COL_INFO,
 304         " Paired TransID 0x%x", paired_trans_id);
 305   }
 306
 307   offset = 0;
 308
 309   if (tree)
 310   {
 311         itdm_ctl_item = proto_tree_add_item(tree, proto_itdm, tvb, 0, -1, ENC_NA);
 312         itdm_ctl_tree = proto_item_add_subtree(itdm_ctl_item, ett_itdm_ctl);
 313
 314         /* These eventually should go into a SFP.0 dissector... */
 315         proto_tree_add_item(itdm_ctl_tree, hf_itdm_timestamp, tvb, offset, 2, ENC_BIG_ENDIAN);
 316         offset += 2;
 317         proto_tree_add_item(itdm_ctl_tree, hf_itdm_seqnum, tvb, offset, 1, ENC_BIG_ENDIAN);
 318         offset += 1;
 319         proto_tree_add_item(itdm_ctl_tree, hf_itdm_sop_eop, tvb, offset, 1, ENC_BIG_ENDIAN);
 320         proto_tree_add_item(itdm_ctl_tree, hf_itdm_last_pack, tvb, offset, 1, ENC_BIG_ENDIAN);
 321         proto_tree_add_item(itdm_ctl_tree, hf_itdm_pktlen, tvb, offset, 2, ENC_BIG_ENDIAN);
 322         offset += 2;
 323         proto_tree_add_item(itdm_ctl_tree, hf_itdm_chksum, tvb, offset, 2, ENC_BIG_ENDIAN);
 324         offset += 2;
 325         proto_tree_add_item(itdm_ctl_tree, hf_itdm_uid, tvb, offset, 3, ENC_BIG_ENDIAN);
 326         offset += 3;
 327
 328         proto_tree_add_item(itdm_ctl_tree, hf_itdm_ctl_transid, tvb, offset, 4, ENC_BIG_ENDIAN);
 329         offset += 4;
 330
 331         proto_tree_add_item(itdm_ctl_tree, hf_itdm_ctl_command, tvb, offset, 1, ENC_BIG_ENDIAN);
 332         offset += 1;
 333         if (command != ITDM_CTL_CMD_AFI_REQ) {
 334                 proto_tree_add_item(itdm_ctl_tree, hf_itdm_ctl_flowid, tvb, offset, 3, ENC_BIG_ENDIAN);
 335         }
 336         offset += 3;
 337         proto_tree_add_item(itdm_ctl_tree, hf_itdm_ctl_dm, tvb, offset, 1, ENC_BIG_ENDIAN);
 338         offset += 1;
 339         /* rsvd.. */
 340         offset += 1;
 341         proto_tree_add_item(itdm_ctl_tree, hf_itdm_ctl_emts, tvb, offset, 2, ENC_BIG_ENDIAN);
 342         offset += 2;
 343         proto_tree_add_item(itdm_ctl_tree, hf_itdm_ctl_pktrate, tvb, offset, 4, ENC_BIG_ENDIAN);
 344         offset += 4;
 345         if (command != ITDM_CTL_CMD_AFI_REQ) {
 346                 proto_tree_add_item(itdm_ctl_tree, hf_itdm_ctl_ptid, tvb, offset, 4, ENC_BIG_ENDIAN);
 347         }
 348         offset += 4;
 349         /* rsvd.. */
 350         offset += 2;
 351         proto_tree_add_item(itdm_ctl_tree, hf_itdm_ctl_cksum, tvb, offset, 2, ENC_BIG_ENDIAN);
 352         offset += 2;
 353   }
 354
 355   next_tvb = tvb_new_subset_remaining(tvb, offset);
 356   call_dissector(data_handle, next_tvb, pinfo, tree);
 357 }
 358
 359 static void
 360 dissect_itdm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 361 {
 362   guint32 flowid;
 363
 364         /* ZZZ for now, 125 usec mode and I-TDM control protocol
 365          * need to add 1ms mode */
 366         if (tvb_length(tvb) < 18)
 367                 return;
 368
 369         /* See if this packet is a data flow or the I-TDM control flow. */
 370         flowid = tvb_get_ntoh24(tvb, ITDM_FLOWID_OFFSET);
 371
 372         /* gbl_ItdmCTLFlowNo is the configurable flow number where
 373          * the control protocol resides... Usually 0.
 374          */
 375         if (flowid == gbl_ItdmCTLFlowNo)
 376                 dissect_itdm_control(tvb, pinfo, tree);
 377         else
 378                 dissect_itdm_125usec(tvb, pinfo, tree);
 379 }
 380
 381 void proto_reg_handoff_itdm(void);
 382
 383 void
 384 proto_register_itdm(void)
 385 {
 386
 387   static hf_register_info hf[] = {
 388     { &hf_itdm_timestamp,{ "Timestamp", "itdm.timestamp",
 389                         FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
 390     { &hf_itdm_seqnum,{ "Sequence Number", "itdm.seqnum",
 391                         FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } },
 392     { &hf_itdm_sop_eop,{ "Start/End of Packet", "itdm.sop_eop",
 393                         FT_UINT8, BASE_DEC, VALS(sop_eop_vals), 0xc0, NULL, HFILL } },
 394     { &hf_itdm_last_pack,{ "Last Packet", "itdm.last_pack",
 395                         FT_BOOLEAN, 8, TFS(&tfs_true_false), 0x20, NULL, HFILL } },
 396     { &hf_itdm_pktlen,{ "Packet Length", "itdm.pktlen",
 397                         FT_UINT16, BASE_DEC, NULL, 0x07ff, NULL, HFILL } },
 398     { &hf_itdm_chksum,{ "Checksum", "itdm.chksum",
 399                         FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } },
 400     { &hf_itdm_uid,{ "Flow ID", "itdm.uid",
 401                         FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL } },
 402     { &hf_itdm_ack,{ "ACK", "itdm.ack",
 403                         FT_BOOLEAN, 8, TFS(&ack_tfs), 0x20, NULL, HFILL } },
 404     { &hf_itdm_act,{ "Activate", "itdm.act",
 405                         FT_BOOLEAN, 8, TFS(&tfs_true_false), 0x10, NULL, HFILL } },
 406     { &hf_itdm_chcmd,{ "Channel Command", "itdm.chcmd",
 407                         FT_UINT8, BASE_DEC, VALS(chcmd_vals), 0x0f, NULL, HFILL } },
 408     { &hf_itdm_chid,{ "Channel ID", "itdm.chid",
 409                         FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL } },
 410     { &hf_itdm_chloc1,{ "Channel Location 1", "itdm.chloc1",
 411                         FT_UINT16, BASE_DEC, NULL, 0x1ff, NULL, HFILL } },
 412     { &hf_itdm_chloc2,{ "Channel Location 2", "itdm.chloc2",
 413                         FT_UINT16, BASE_DEC, NULL, 0x1ff, NULL, HFILL } },
 414     { &hf_itdm_pktrate,{ "IEEE 754 Packet Rate", "itdm.pktrate",
 415                          FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
 416     { &hf_itdm_cxnsize, { "Connection Size", "itdm.cxnsize",
 417                          FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
 418
 419     { &hf_itdm_ctl_transid, { "Transaction ID", "itdm.ctl_transid",
 420                          FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
 421     { &hf_itdm_ctl_command, { "Control Command", "itdm.ctl_cmd",
 422                          FT_UINT8, BASE_DEC, VALS(itdm_ctl_command_vals), 0x0, NULL, HFILL } },
 423     { &hf_itdm_ctl_flowid, { "Allocated Flow ID", "itdm.ctl_flowid",
 424                          FT_UINT24, BASE_DEC, NULL, 0x0, NULL, HFILL } },
 425     { &hf_itdm_ctl_dm, { "I-TDM Data Mode", "itdm.ctl_dm",
 426                          FT_UINT8, BASE_DEC, VALS(itdm_ctl_data_mode_vals), 0x0, NULL, HFILL } },
 427     { &hf_itdm_ctl_emts, { "I-TDM Explicit Multi-timeslot Size", "itdm.ctlemts",
 428                          FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
 429     { &hf_itdm_ctl_pktrate, { "I-TDM Packet Rate", "itdm.ctl_pktrate",
 430                          FT_UINT32, BASE_HEX, VALS(itdm_ctl_pktrate_vals), 0x0, NULL, HFILL } },
 431     { &hf_itdm_ctl_ptid, { "Paired Transaction ID", "itdm.ctl_ptid",
 432                          FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
 433     { &hf_itdm_ctl_cksum, { "ITDM Control Message Checksum", "itdm.ctl_cksum",
 434                          FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } }
 435   };
 436
 437   static gint *ett[] = {
 438     &ett_itdm,
 439     &ett_itdm_ctl
 440   };
 441
 442   module_t *itdm_module;
 443
 444   proto_itdm = proto_register_protocol("Internal TDM", "ITDM", "itdm");
 445   register_dissector("itdm", dissect_itdm, proto_itdm);
 446
 447   proto_register_field_array(proto_itdm, hf, array_length(hf));
 448   proto_register_subtree_array(ett, array_length(ett));
 449
 450   itdm_module = prefs_register_protocol(proto_itdm, proto_reg_handoff_itdm);
 451
 452   prefs_register_uint_preference(itdm_module, "mpls_label",
 453     "ITDM MPLS label (Flow Bundle ID in hex)",
 454     "The MPLS label (aka Flow Bundle ID) used by ITDM traffic.",
 455     16, &gbl_ItdmMPLSLabel);
 456
 457   prefs_register_uint_preference(itdm_module, "ctl_flowno",
 458     "I-TDM Control Protocol Flow Number",
 459     "Flow Number used by I-TDM Control Protocol traffic.",
 460     10, &gbl_ItdmCTLFlowNo);
 461 }
 462
 463 void
 464 proto_reg_handoff_itdm(void)
 465 {
 466         static gboolean Initialized=FALSE;
 467         static dissector_handle_t itdm_handle;
 468         static guint ItdmMPLSLabel;
 469
 470         if (!Initialized) {
 471                 itdm_handle = find_dissector("itdm");
 472                 data_handle = find_dissector("data");
 473                 Initialized=TRUE;
 474         } else {
 475                 dissector_delete_uint("mpls.label", ItdmMPLSLabel, itdm_handle);
 476         }
 477
 478         ItdmMPLSLabel = gbl_ItdmMPLSLabel;
 479         dissector_add_uint("mpls.label", gbl_ItdmMPLSLabel, itdm_handle);
 480 }