epan/dissectors/packet-mtp3.c

   1 /* packet-mtp3.c
   2  * Routines for Message Transfer Part Level 3 dissection
   3  *
   4  * It is (hopefully) compliant to:
   5  *   ANSI T1.111.4-1996
   6  *   ITU-T Q.704 7/1996
   7  *   GF 001-9001 (Chinese ITU variant)
   8  *   JT-Q704 and NTT-Q704 (Japan)
   9  *
  10  *   Note that the division of the Japan SLS into the SLC and A/B bit (for
  11  *   management messages) is not done.
  12  *
  13  * Copyright 2001, Michael Tuexen <tuexen [AT] fh-muenster.de>
  14  * Updated for ANSI, Chinese ITU, and Japan support by
  15  *  Jeff Morriss <jeff.morriss.ws [AT] gmail.com>
  16  *
  17  * $Id$
  18  *
  19  * Wireshark - Network traffic analyzer
  20  * By Gerald Combs <gerald@wireshark.org>
  21  * Copyright 1998 Gerald Combs
  22  *
  23  * Copied from README.developer
  24  *
  25  * This program is free software; you can redistribute it and/or
  26  * modify it under the terms of the GNU General Public License
  27  * as published by the Free Software Foundation; either version 2
  28  * of the License, or (at your option) any later version.
  29  *
  30  * This program is distributed in the hope that it will be useful,
  31  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  * GNU General Public License for more details.
  34  *
  35  * You should have received a copy of the GNU General Public License
  36  * along with this program; if not, write to the Free Software
  37  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  38  */
  39
  40 #ifdef HAVE_CONFIG_H
  41 # include "config.h"
  42 #endif
  43
  44 #include <string.h>
  45 #include <glib.h>
  46
  47 #include <epan/packet.h>
  48 #include <epan/tap.h>
  49 #include <epan/prefs.h>
  50 #include <epan/emem.h>
  51 #include "packet-q708.h"
  52 #include "packet-sccp.h"
  53
  54 /* Initialize the protocol and registered fields */
  55 static int proto_mtp3  = -1;
  56
  57 static int mtp3_tap = -1;
  58
  59 static module_t *mtp3_module;
  60
  61 static int hf_mtp3_service_indicator = -1;
  62 static int hf_mtp3_network_indicator = -1;
  63 static int hf_mtp3_itu_spare = -1;
  64 static int hf_mtp3_itu_priority = -1;
  65 static int hf_mtp3_ansi_priority = -1;
  66 static int hf_mtp3_itu_pc = -1;
  67 static int hf_mtp3_24bit_pc = -1;
  68 static int hf_mtp3_itu_opc = -1;
  69 static int hf_mtp3_24bit_opc = -1;
  70 static int hf_mtp3_ansi_opc = -1;
  71 static int hf_mtp3_chinese_opc = -1;
  72 static int hf_mtp3_opc_network = -1;
  73 static int hf_mtp3_opc_cluster = -1;
  74 static int hf_mtp3_opc_member = -1;
  75 static int hf_mtp3_itu_dpc = -1;
  76 static int hf_mtp3_24bit_dpc = -1;
  77 static int hf_mtp3_ansi_dpc = -1;
  78 static int hf_mtp3_chinese_dpc = -1;
  79 static int hf_mtp3_dpc_network = -1;
  80 static int hf_mtp3_dpc_cluster = -1;
  81 static int hf_mtp3_dpc_member = -1;
  82 static int hf_mtp3_itu_sls = -1;
  83 static int hf_mtp3_ansi_5_bit_sls = -1;
  84 static int hf_mtp3_ansi_8_bit_sls = -1;
  85 static int hf_mtp3_chinese_itu_sls = -1;
  86 static int hf_mtp3_japan_dpc = -1;
  87 static int hf_mtp3_japan_opc = -1;
  88 static int hf_mtp3_japan_pc = -1;
  89 static int hf_mtp3_japan_4_bit_sls = -1;
  90 static int hf_mtp3_japan_4_bit_sls_spare = -1;
  91 static int hf_mtp3_japan_5_bit_sls = -1;
  92 static int hf_mtp3_japan_5_bit_sls_spare = -1;
  93
  94 /* Initialize the subtree pointers */
  95 static gint ett_mtp3 = -1;
  96 static gint ett_mtp3_sio = -1;
  97 static gint ett_mtp3_label = -1;
  98 static gint ett_mtp3_label_dpc = -1;
  99 static gint ett_mtp3_label_opc = -1;
 100
 101 static dissector_table_t mtp3_sio_dissector_table;
 102
 103 typedef enum {
 104   ITU_PC_STRUCTURE_NONE    = 1,
 105   ITU_PC_STRUCTURE_3_8_3   = 2,
 106   ITU_PC_STRUCTURE_4_3_4_3 = 3
 107 } ITU_PC_Structure_Type;
 108
 109 typedef enum {
 110   JAPAN_PC_STRUCTURE_NONE    = 1,
 111   JAPAN_PC_STRUCTURE_7_4_5   = 2,
 112   JAPAN_PC_STRUCTURE_3_4_4_5 = 3
 113 } JAPAN_PC_Structure_Type;
 114
 115 static gint itu_pc_structure = ITU_PC_STRUCTURE_NONE;
 116 static gint japan_pc_structure = JAPAN_PC_STRUCTURE_NONE;
 117
 118 #include <packet-mtp3.h>
 119 gint mtp3_standard = ITU_STANDARD;
 120
 121 static gboolean mtp3_use_ansi_5_bit_sls = FALSE;
 122 static gboolean mtp3_use_japan_5_bit_sls = FALSE;
 123 static gboolean mtp3_show_itu_priority = FALSE;
 124 static gboolean mtp3_heuristic_standard = FALSE;
 125 static gint mtp3_addr_fmt = MTP3_ADDR_FMT_DASHED;
 126 static mtp3_addr_pc_t* mtp3_addr_dpc;
 127 static mtp3_addr_pc_t* mtp3_addr_opc;
 128
 129 #define SIO_LENGTH                1
 130 #define SLS_LENGTH                1
 131 #define SIO_OFFSET                0
 132 #define ROUTING_LABEL_OFFSET      (SIO_OFFSET + SIO_LENGTH)
 133
 134 #define ITU_ROUTING_LABEL_LENGTH  4
 135 #define ITU_HEADER_LENGTH         (SIO_LENGTH + ITU_ROUTING_LABEL_LENGTH)
 136
 137 #define ITU_SLS_OFFSET            (SIO_OFFSET + ITU_HEADER_LENGTH - SLS_LENGTH)
 138 #define ITU_MTP_PAYLOAD_OFFSET    (SIO_OFFSET + ITU_HEADER_LENGTH)
 139
 140 #define ANSI_ROUTING_LABEL_LENGTH (ANSI_PC_LENGTH + ANSI_PC_LENGTH + SLS_LENGTH)
 141 #define ANSI_HEADER_LENGTH        (SIO_LENGTH + ANSI_ROUTING_LABEL_LENGTH)
 142
 143 #define ANSI_DPC_OFFSET           ROUTING_LABEL_OFFSET
 144 #define ANSI_OPC_OFFSET           (ANSI_DPC_OFFSET + ANSI_PC_LENGTH)
 145 #define ANSI_SLS_OFFSET           (ANSI_OPC_OFFSET + ANSI_PC_LENGTH)
 146 #define ANSI_MTP_PAYLOAD_OFFSET   (SIO_OFFSET + ANSI_HEADER_LENGTH)
 147
 148 #define JAPAN_SLS_SPARE_LENGTH           1
 149 #define JAPAN_ROUTING_LABEL_LENGTH (JAPAN_PC_LENGTH + JAPAN_PC_LENGTH + JAPAN_SLS_SPARE_LENGTH)
 150 #define JAPAN_HEADER_LENGTH        (SIO_LENGTH + JAPAN_ROUTING_LABEL_LENGTH)
 151
 152 #define JAPAN_OPC_OFFSET           (ROUTING_LABEL_OFFSET + JAPAN_PC_LENGTH)
 153 #define JAPAN_SLS_OFFSET           (JAPAN_OPC_OFFSET + JAPAN_PC_LENGTH)
 154 #define JAPAN_SPARE_OFFSET         (ROUTING_LABEL_OFFSET + JAPAN_ROUTING_LABEL_LENGTH)
 155 #define JAPAN_MTP_PAYLOAD_OFFSET   (SIO_OFFSET + JAPAN_HEADER_LENGTH)
 156
 157 #define SERVICE_INDICATOR_MASK     0x0F
 158 #define SPARE_MASK                 0x30
 159 #define ANSI_PRIORITY_MASK         SPARE_MASK
 160 #define NETWORK_INDICATOR_MASK     0xC0
 161 #define ITU_DPC_MASK               0x00003FFF
 162 #define ITU_OPC_MASK               0x0FFFC000
 163 #define ITU_SLS_MASK               0xF0000000
 164
 165 #define ANSI_5BIT_SLS_MASK         0x1F
 166 #define ANSI_8BIT_SLS_MASK         0xFF
 167 #define CHINESE_ITU_SLS_MASK       0xF
 168 #define JAPAN_4_BIT_SLS_MASK       0xF
 169 #define JAPAN_4_BIT_SLS_SPARE_MASK 0xF0
 170 #define JAPAN_5_BIT_SLS_MASK       0x1F
 171 #define JAPAN_5_BIT_SLS_SPARE_MASK 0xE0
 172
 173 /* the higher values are taken from the M3UA RFC */
 174 static const value_string mtp3_service_indicator_code_vals[] = {
 175         { 0x0,  "Signalling Network Management Message (SNM)" },
 176         { 0x1,  "Maintenance Regular Message (MTN)" },
 177         { 0x2,  "Maintenance Special Message (MTNS)" },
 178         { 0x3,  "SCCP" },
 179         { 0x4,  "TUP" },
 180         { 0x5,  "ISUP" },
 181         { 0x6,  "DUP (call and circuit related messages)" },
 182         { 0x7,  "DUP (facility registration and cancellation message)" },
 183         { 0x8,  "MTP testing user part" },
 184         { 0x9,  "Broadband ISUP" },
 185         { 0xa,  "Satellite ISUP" },
 186         { 0xb,  "Spare" },
 187         { 0xc,  "AAL type2 Signaling" },
 188         { 0xd,  "Bearer Independent Call Control (BICC)" },
 189         { 0xe,  "Gateway Control Protocol" },
 190         { 0xf,  "Spare" },
 191         { 0,    NULL }
 192 };
 193
 194 const value_string mtp3_service_indicator_code_short_vals[] = {
 195         { 0x0,  "SNM" },
 196         { 0x1,  "MTN" },
 197         { 0x2,  "MTNS" },
 198         { 0x3,  "SCCP" },
 199         { 0x4,  "TUP" },
 200         { 0x5,  "ISUP" },
 201         { 0x6,  "DUP (CC)" },
 202         { 0x7,  "DUP (FAC/CANC)" },
 203         { 0x8,  "MTP Test" },
 204         { 0x9,  "ISUP-b" },
 205         { 0xa,  "ISUP-s" },
 206         { 0xc,  "AAL type 2" },
 207         { 0xd,  "BICC" },
 208         { 0xe,  "GCP" },
 209         { 0,    NULL }
 210 };
 211
 212 static const value_string network_indicator_vals[] = {
 213         { 0x0,  "International network" },
 214         { 0x1,  "Spare (for international use only)" },
 215         { 0x2,  "National network" },
 216         { 0x3,  "Reserved for national use" },
 217         { 0,    NULL }
 218 };
 219
 220 static dissector_handle_t data_handle;
 221
 222
 223 /*
 224  * helper routine to format a point code in structured form
 225  */
 226
 227 void
 228 mtp3_pc_to_str_buf(const guint32 pc, gchar *buf, int buf_len)
 229 {
 230   switch (mtp3_standard)
 231   {
 232     case ITU_STANDARD:
 233       switch (itu_pc_structure) {
 234         case ITU_PC_STRUCTURE_NONE:
 235           g_snprintf(buf, buf_len, "%u", pc);
 236           break;
 237         case ITU_PC_STRUCTURE_3_8_3:
 238           /* this format is used in international ITU networks */
 239           g_snprintf(buf, buf_len, "%u-%u-%u", (pc & 0x3800)>>11, (pc & 0x7f8) >> 3, (pc & 0x07) >> 0);
 240           break;
 241         case ITU_PC_STRUCTURE_4_3_4_3:
 242           /* this format is used in some national ITU networks, the German one for example. */
 243           g_snprintf(buf, buf_len, "%u-%u-%u-%u", (pc & 0x3c00) >>10, (pc & 0x0380) >> 7, (pc & 0x0078) >> 3, (pc & 0x0007) >> 0);
 244           break;
 245         default:
 246           DISSECTOR_ASSERT_NOT_REACHED();
 247       }
 248       break;
 249     case ANSI_STANDARD:
 250     case CHINESE_ITU_STANDARD:
 251       g_snprintf(buf, buf_len, "%u-%u-%u", (pc & ANSI_NETWORK_MASK) >> 16, (pc & ANSI_CLUSTER_MASK) >> 8, (pc & ANSI_MEMBER_MASK));
 252       break;
 253     case JAPAN_STANDARD:
 254       switch (japan_pc_structure) {
 255         case JAPAN_PC_STRUCTURE_NONE:
 256           g_snprintf(buf, buf_len, "%u", pc);
 257           break;
 258         case JAPAN_PC_STRUCTURE_7_4_5:
 259           /* This format is specified by NTT */
 260           g_snprintf(buf, buf_len, "%u-%u-%u", (pc & 0xfe00)>>9, (pc & 0x1e0)>>5, (pc & 0x1f));
 261           break;
 262         case JAPAN_PC_STRUCTURE_3_4_4_5:
 263           /* Where does this format come from? */
 264           g_snprintf(buf, buf_len, "%u-%u-%u-%u", (pc & 0xe000)>>13, (pc & 0x1e00)>>9, (pc & 0x1e0)>>5, (pc & 0x1f));
 265           break;
 266         default:
 267           DISSECTOR_ASSERT_NOT_REACHED();
 268       }
 269       break;
 270     default:
 271       DISSECTOR_ASSERT_NOT_REACHED();
 272     }
 273 }
 274
 275 #define MAX_STRUCTURED_PC_LENGTH 20
 276
 277 gchar *
 278 mtp3_pc_to_str(const guint32 pc)
 279 {
 280   gchar *str;
 281
 282   str=ep_alloc(MAX_STRUCTURED_PC_LENGTH);
 283   mtp3_pc_to_str_buf(pc, str, MAX_STRUCTURED_PC_LENGTH);
 284   return str;
 285 }
 286
 287 gboolean
 288 mtp3_pc_structured(void)
 289 {
 290   if ((mtp3_standard == ITU_STANDARD) && (itu_pc_structure == ITU_PC_STRUCTURE_NONE))
 291     return FALSE;
 292   else if ((mtp3_standard == JAPAN_STANDARD) && (japan_pc_structure == JAPAN_PC_STRUCTURE_NONE))
 293     return FALSE;
 294   else
 295     return TRUE;
 296 }
 297
 298 /*
 299  * helper routine to format address to string
 300  */
 301
 302 void
 303 mtp3_addr_to_str_buf(const mtp3_addr_pc_t  *addr_pc_p,
 304                      gchar *buf, int buf_len)
 305 {
 306   switch (mtp3_addr_fmt)
 307   {
 308   case MTP3_ADDR_FMT_DEC:
 309     switch (addr_pc_p->type)
 310     {
 311     case ITU_STANDARD:
 312       g_snprintf(buf, buf_len, "%u", addr_pc_p->pc & ITU_PC_MASK);
 313       break;
 314     case JAPAN_STANDARD:
 315       g_snprintf(buf, buf_len, "%u", addr_pc_p->pc & JAPAN_PC_MASK);
 316       break;
 317     default:
 318       /* assuming 24-bit */
 319       g_snprintf(buf, buf_len, "%u", addr_pc_p->pc & ANSI_PC_MASK);
 320       break;
 321     }
 322     break;
 323
 324   case MTP3_ADDR_FMT_HEX:
 325     switch (addr_pc_p->type)
 326     {
 327     case ITU_STANDARD:
 328       g_snprintf(buf, buf_len, "%x", addr_pc_p->pc & ITU_PC_MASK);
 329       break;
 330     case JAPAN_STANDARD:
 331       g_snprintf(buf, buf_len, "%x", addr_pc_p->pc & JAPAN_PC_MASK);
 332       break;
 333     default:
 334       /* assuming 24-bit */
 335       g_snprintf(buf, buf_len, "%x", addr_pc_p->pc & ANSI_PC_MASK);
 336       break;
 337     }
 338     break;
 339
 340   case MTP3_ADDR_FMT_NI_DEC:
 341     switch (addr_pc_p->type)
 342     {
 343     case ITU_STANDARD:
 344       g_snprintf(buf, buf_len, "%u:%u", addr_pc_p->ni, addr_pc_p->pc & ITU_PC_MASK);
 345       break;
 346     case JAPAN_STANDARD:
 347       g_snprintf(buf, buf_len, "%u:%u", addr_pc_p->ni, addr_pc_p->pc & JAPAN_PC_MASK);
 348       break;
 349     default:
 350       /* assuming 24-bit */
 351       g_snprintf(buf, buf_len, "%u:%u", addr_pc_p->ni, addr_pc_p->pc & ANSI_PC_MASK);
 352       break;
 353     }
 354     break;
 355
 356   case MTP3_ADDR_FMT_NI_HEX:
 357     switch (addr_pc_p->type)
 358     {
 359     case ITU_STANDARD:
 360       g_snprintf(buf, buf_len, "%u:%x", addr_pc_p->ni, addr_pc_p->pc & ITU_PC_MASK);
 361       break;
 362     case JAPAN_STANDARD:
 363       g_snprintf(buf, buf_len, "%u:%x", addr_pc_p->ni, addr_pc_p->pc & JAPAN_PC_MASK);
 364       break;
 365     default:
 366       /* assuming 24-bit */
 367       g_snprintf(buf, buf_len, "%u:%x", addr_pc_p->ni, addr_pc_p->pc & ANSI_PC_MASK);
 368       break;
 369     }
 370     break;
 371
 372   default:
 373     /* FALLTHRU */
 374
 375   case MTP3_ADDR_FMT_DASHED:
 376     mtp3_pc_to_str_buf(addr_pc_p->pc, buf, buf_len);
 377     break;
 378   }
 379 }
 380
 381 guint32
 382 mtp3_pc_hash(const mtp3_addr_pc_t *addr_pc_p) {
 383     guint32 pc;
 384
 385     switch (addr_pc_p->type)
 386     {
 387         case ITU_STANDARD:
 388             pc = (addr_pc_p->pc & ITU_PC_MASK) | ((addr_pc_p->ni % 4) << 14) ;
 389             break;
 390         default:
 391             /* assuming 24-bit */
 392             pc = (addr_pc_p->pc & ANSI_PC_MASK) | ((addr_pc_p->ni) << 24) ;
 393             break;
 394     }
 395
 396     return pc;
 397 }
 398
 399 /*  Common function for dissecting 3-byte (ANSI or China) PCs. */
 400 void
 401 dissect_mtp3_3byte_pc(tvbuff_t *tvb, guint offset, proto_tree *tree, gint ett_pc, int hf_pc_string, int hf_pc_network,
 402                       int hf_pc_cluster, int hf_pc_member, int hf_dpc, int hf_pc)
 403 {
 404     guint32 pc;
 405     proto_item *pc_item, *hidden_item;
 406     proto_tree *pc_tree;
 407     char pc_string[MAX_STRUCTURED_PC_LENGTH];
 408
 409     pc = tvb_get_letoh24(tvb, offset);
 410     mtp3_pc_to_str_buf(pc, pc_string, sizeof(pc_string));
 411
 412     pc_item = proto_tree_add_string(tree, hf_pc_string, tvb, offset, ANSI_PC_LENGTH, pc_string);
 413
 414     /* Add alternate formats of the PC
 415      * NOTE: each of these formats is shown to the user,
 416      * so I think that using hidden fields in this case is OK.
 417      */
 418     g_snprintf(pc_string, sizeof(pc_string), "%u", pc);
 419     proto_item_append_text(pc_item, " (%s)", pc_string);
 420     hidden_item = proto_tree_add_string(tree, hf_pc_string, tvb, offset, ANSI_PC_LENGTH, pc_string);
 421     PROTO_ITEM_SET_HIDDEN(hidden_item);
 422     g_snprintf(pc_string, sizeof(pc_string), "0x%x", pc);
 423     proto_item_append_text(pc_item, " (%s)", pc_string);
 424     hidden_item = proto_tree_add_string(tree, hf_pc_string, tvb, offset, ANSI_PC_LENGTH, pc_string);
 425     PROTO_ITEM_SET_HIDDEN(hidden_item);
 426
 427     pc_tree = proto_item_add_subtree(pc_item, ett_pc);
 428
 429     proto_tree_add_uint(pc_tree, hf_pc_network, tvb, offset + ANSI_NETWORK_OFFSET, ANSI_NCM_LENGTH, pc);
 430     proto_tree_add_uint(pc_tree, hf_pc_cluster, tvb, offset + ANSI_CLUSTER_OFFSET, ANSI_NCM_LENGTH, pc);
 431     proto_tree_add_uint(pc_tree, hf_pc_member,  tvb, offset + ANSI_MEMBER_OFFSET,  ANSI_NCM_LENGTH, pc);
 432
 433     /* add full integer values of DPC as hidden for filtering purposes */
 434     if (hf_dpc) {
 435         hidden_item = proto_tree_add_uint(pc_tree, hf_dpc, tvb, offset, ANSI_PC_LENGTH, pc);
 436         PROTO_ITEM_SET_HIDDEN(hidden_item);
 437     }
 438     if (hf_pc) {
 439         hidden_item = proto_tree_add_uint(pc_tree, hf_pc,  tvb, offset, ANSI_PC_LENGTH, pc);
 440         PROTO_ITEM_SET_HIDDEN(hidden_item);
 441     }
 442 }
 443
 444 static void
 445 dissect_mtp3_sio(tvbuff_t *tvb, packet_info *pinfo, proto_tree *mtp3_tree, void ** const pd_save)
 446 {
 447   guint8 sio;
 448   proto_item *sio_item;
 449   proto_tree *sio_tree;
 450
 451   sio_item = proto_tree_add_text(mtp3_tree, tvb, SIO_OFFSET, SIO_LENGTH, "Service information octet");
 452   sio_tree = proto_item_add_subtree(sio_item, ett_mtp3_sio);
 453
 454   sio = tvb_get_guint8(tvb, SIO_OFFSET);
 455   proto_tree_add_uint(sio_tree, hf_mtp3_network_indicator, tvb, SIO_OFFSET, SIO_LENGTH, sio);
 456
 457   mtp3_addr_opc->ni = (sio & NETWORK_INDICATOR_MASK) >> 6;
 458   mtp3_addr_dpc->ni = (sio & NETWORK_INDICATOR_MASK) >> 6;
 459
 460   switch(mtp3_standard){
 461   case ANSI_STANDARD:
 462     proto_tree_add_uint(sio_tree, hf_mtp3_ansi_priority, tvb, SIO_OFFSET, SIO_LENGTH, sio);
 463     break;
 464   case ITU_STANDARD:
 465   case CHINESE_ITU_STANDARD:
 466     if (mtp3_show_itu_priority)
 467       proto_tree_add_uint(sio_tree, hf_mtp3_itu_priority, tvb, SIO_OFFSET, SIO_LENGTH, sio);
 468     else
 469       proto_tree_add_uint(sio_tree, hf_mtp3_itu_spare, tvb, SIO_OFFSET, SIO_LENGTH, sio);
 470     break;
 471   case JAPAN_STANDARD:
 472     /*  The Japan variant has priority but it's on the LI which belongs to
 473      *  layer 2.  Not sure what we can do about that...
 474      */
 475     proto_tree_add_uint(sio_tree, hf_mtp3_itu_spare, tvb, SIO_OFFSET, SIO_LENGTH, sio);
 476     break;
 477   }
 478
 479   proto_tree_add_uint(sio_tree, hf_mtp3_service_indicator, tvb, SIO_OFFSET, SIO_LENGTH, sio);
 480
 481   /* Store the SI so that subidissectors know what SI this msg is */
 482   *pd_save = pinfo->private_data;
 483   pinfo->private_data = GUINT_TO_POINTER(sio & SERVICE_INDICATOR_MASK);
 484 }
 485
 486 static void
 487 dissect_mtp3_routing_label(tvbuff_t *tvb, packet_info *pinfo, proto_tree *mtp3_tree)
 488 {
 489   guint32 label, dpc, opc;
 490   proto_item *label_item, *label_dpc_item, *label_opc_item;
 491   proto_item *hidden_item;
 492   proto_tree *label_tree;
 493   proto_tree *pc_subtree;
 494   int hf_dpc_string;
 495   int hf_opc_string;
 496
 497
 498   switch (mtp3_standard) {
 499   case ITU_STANDARD:
 500     label_item = proto_tree_add_text(mtp3_tree, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, "Routing label");
 501     label_tree = proto_item_add_subtree(label_item, ett_mtp3_label);
 502
 503     label = tvb_get_letohl(tvb, ROUTING_LABEL_OFFSET);
 504
 505     opc = (label & ITU_OPC_MASK) >> 14;
 506     dpc =  label & ITU_DPC_MASK;
 507
 508     hidden_item = proto_tree_add_uint(label_tree, hf_mtp3_itu_pc, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, opc);
 509     PROTO_ITEM_SET_HIDDEN(hidden_item);
 510     hidden_item = proto_tree_add_uint(label_tree, hf_mtp3_itu_pc, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, dpc);
 511     PROTO_ITEM_SET_HIDDEN(hidden_item);
 512
 513     label_dpc_item = proto_tree_add_uint(label_tree, hf_mtp3_itu_dpc, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, label);
 514     if (mtp3_pc_structured())
 515       proto_item_append_text(label_dpc_item, " (%s)", mtp3_pc_to_str(dpc));
 516     if(mtp3_addr_dpc->ni == 0)
 517     {
 518       pc_subtree = proto_item_add_subtree(label_dpc_item, ett_mtp3_label_dpc);
 519       analyze_q708_ispc(tvb, pc_subtree, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, dpc);
 520         }
 521
 522
 523     label_opc_item = proto_tree_add_uint(label_tree, hf_mtp3_itu_opc, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, label);
 524     if (mtp3_pc_structured())
 525       proto_item_append_text(label_opc_item, " (%s)", mtp3_pc_to_str(opc));
 526     if(mtp3_addr_opc->ni == 0)
 527     {
 528       pc_subtree = proto_item_add_subtree(label_opc_item, ett_mtp3_label_opc);
 529       analyze_q708_ispc(tvb, pc_subtree, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, opc);
 530         }
 531
 532     proto_tree_add_uint(label_tree, hf_mtp3_itu_sls, tvb, ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, label);
 533     break;
 534
 535   case ANSI_STANDARD:
 536   case CHINESE_ITU_STANDARD:
 537     if (mtp3_standard == ANSI_STANDARD)
 538     {
 539       hf_dpc_string = hf_mtp3_ansi_dpc;
 540       hf_opc_string = hf_mtp3_ansi_opc;
 541     } else /* CHINESE_ITU_STANDARD */ {
 542       hf_dpc_string = hf_mtp3_chinese_dpc;
 543       hf_opc_string = hf_mtp3_chinese_opc;
 544     }
 545
 546     /* Create the Routing Label Tree */
 547     label_item = proto_tree_add_text(mtp3_tree, tvb, ROUTING_LABEL_OFFSET, ANSI_ROUTING_LABEL_LENGTH, "Routing label");
 548     label_tree = proto_item_add_subtree(label_item, ett_mtp3_label);
 549
 550
 551     /* create and fill the DPC tree */
 552     dissect_mtp3_3byte_pc(tvb, ANSI_DPC_OFFSET, label_tree, ett_mtp3_label_dpc, hf_dpc_string, hf_mtp3_dpc_network,
 553                           hf_mtp3_dpc_cluster, hf_mtp3_dpc_member, hf_mtp3_24bit_dpc, hf_mtp3_24bit_pc);
 554     /* Store dpc for mtp3_addr below */
 555     dpc = tvb_get_letoh24(tvb, ANSI_DPC_OFFSET);
 556
 557     /* create and fill the OPC tree */
 558     dissect_mtp3_3byte_pc(tvb, ANSI_OPC_OFFSET, label_tree, ett_mtp3_label_opc, hf_opc_string, hf_mtp3_opc_network,
 559                           hf_mtp3_opc_cluster, hf_mtp3_opc_member, hf_mtp3_24bit_opc, hf_mtp3_24bit_pc);
 560     /* Store opc for mtp3_addr below */
 561     opc = tvb_get_letoh24(tvb, ANSI_OPC_OFFSET);
 562
 563     /* SLS */
 564     if (mtp3_standard == ANSI_STANDARD) {
 565       if (mtp3_use_ansi_5_bit_sls)
 566         proto_tree_add_item(label_tree, hf_mtp3_ansi_5_bit_sls, tvb, ANSI_SLS_OFFSET, SLS_LENGTH, ENC_NA);
 567       else
 568         proto_tree_add_item(label_tree, hf_mtp3_ansi_8_bit_sls, tvb, ANSI_SLS_OFFSET, SLS_LENGTH, ENC_NA);
 569     } else /* CHINESE_ITU_STANDARD */ {
 570       proto_tree_add_item(label_tree, hf_mtp3_chinese_itu_sls, tvb, ANSI_SLS_OFFSET, SLS_LENGTH, ENC_NA);
 571     }
 572     break;
 573
 574   case JAPAN_STANDARD:
 575     label_item = proto_tree_add_text(mtp3_tree, tvb, ROUTING_LABEL_OFFSET, JAPAN_ROUTING_LABEL_LENGTH, "Routing label");
 576     label_tree = proto_item_add_subtree(label_item, ett_mtp3_label);
 577
 578     label_dpc_item = proto_tree_add_item(label_tree, hf_mtp3_japan_dpc, tvb, ROUTING_LABEL_OFFSET, JAPAN_PC_LENGTH, ENC_LITTLE_ENDIAN);
 579     dpc = tvb_get_letohs(tvb, ROUTING_LABEL_OFFSET);
 580     if (mtp3_pc_structured()) {
 581       proto_item_append_text(label_dpc_item, " (%s)", mtp3_pc_to_str(dpc));
 582     }
 583
 584     label_opc_item = proto_tree_add_item(label_tree, hf_mtp3_japan_opc, tvb, JAPAN_OPC_OFFSET, JAPAN_PC_LENGTH, ENC_LITTLE_ENDIAN);
 585     opc = tvb_get_letohs(tvb, JAPAN_OPC_OFFSET);
 586     if (mtp3_pc_structured()) {
 587       proto_item_append_text(label_opc_item, " (%s)", mtp3_pc_to_str(opc));
 588     }
 589
 590     hidden_item = proto_tree_add_item(label_tree, hf_mtp3_japan_pc, tvb, ROUTING_LABEL_OFFSET, JAPAN_PC_LENGTH, ENC_LITTLE_ENDIAN);
 591     PROTO_ITEM_SET_HIDDEN(hidden_item);
 592     hidden_item = proto_tree_add_item(label_tree, hf_mtp3_japan_pc, tvb, JAPAN_OPC_OFFSET, JAPAN_PC_LENGTH, ENC_LITTLE_ENDIAN);
 593     PROTO_ITEM_SET_HIDDEN(hidden_item);
 594
 595     if (mtp3_use_japan_5_bit_sls) {
 596         proto_tree_add_item(label_tree, hf_mtp3_japan_5_bit_sls, tvb, JAPAN_SLS_OFFSET, JAPAN_SLS_SPARE_LENGTH, ENC_NA);
 597         proto_tree_add_item(label_tree, hf_mtp3_japan_5_bit_sls_spare, tvb, JAPAN_SLS_OFFSET, JAPAN_SLS_SPARE_LENGTH, ENC_NA);
 598     } else {
 599         proto_tree_add_item(label_tree, hf_mtp3_japan_4_bit_sls, tvb, JAPAN_SLS_OFFSET, JAPAN_SLS_SPARE_LENGTH, ENC_NA);
 600         proto_tree_add_item(label_tree, hf_mtp3_japan_4_bit_sls_spare, tvb, JAPAN_SLS_OFFSET, JAPAN_SLS_SPARE_LENGTH, ENC_NA);
 601     }
 602
 603     break;
 604   default:
 605     DISSECTOR_ASSERT_NOT_REACHED();
 606   }
 607
 608   mtp3_addr_opc->type = mtp3_standard;
 609   mtp3_addr_opc->pc = opc;
 610   SET_ADDRESS(&pinfo->src, AT_SS7PC, sizeof(mtp3_addr_pc_t), (guint8 *) mtp3_addr_opc);
 611
 612   mtp3_addr_dpc->type = mtp3_standard;
 613   mtp3_addr_dpc->pc = dpc;
 614   SET_ADDRESS(&pinfo->dst, AT_SS7PC, sizeof(mtp3_addr_pc_t), (guint8 *) mtp3_addr_dpc);
 615 }
 616
 617 static void
 618 dissect_mtp3_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 619 {
 620   guint8 sio;
 621   guint8 service_indicator;
 622   tvbuff_t *payload_tvb = NULL;
 623
 624   sio               = tvb_get_guint8(tvb, SIO_OFFSET);
 625   service_indicator = sio & SERVICE_INDICATOR_MASK;
 626
 627   switch (mtp3_standard) {
 628   case ITU_STANDARD:
 629     payload_tvb = tvb_new_subset_remaining(tvb, ITU_MTP_PAYLOAD_OFFSET);
 630     break;
 631   case ANSI_STANDARD:
 632   case CHINESE_ITU_STANDARD:
 633     payload_tvb = tvb_new_subset_remaining(tvb, ANSI_MTP_PAYLOAD_OFFSET);
 634     break;
 635   case JAPAN_STANDARD:
 636     payload_tvb = tvb_new_subset_remaining(tvb, JAPAN_MTP_PAYLOAD_OFFSET);
 637     break;
 638   default:
 639     DISSECTOR_ASSERT_NOT_REACHED();
 640   }
 641
 642   col_set_str(pinfo->cinfo, COL_INFO, "DATA ");
 643
 644   if (!dissector_try_uint(mtp3_sio_dissector_table, service_indicator, payload_tvb, pinfo, tree))
 645     call_dissector(data_handle, payload_tvb, pinfo, tree);
 646 }
 647
 648 #define HEURISTIC_FAILED_STANDARD 0xffff
 649 static guint
 650 heur_mtp3_standard(tvbuff_t *tvb, packet_info *pinfo, guint8 si)
 651 {
 652
 653     guint32 len;
 654     tvbuff_t *payload;
 655
 656     len = tvb_length(tvb);
 657     switch (si) {
 658     case 3:
 659         {
 660             payload = tvb_new_subset(tvb, ITU_HEADER_LENGTH, len-ITU_HEADER_LENGTH, len-ITU_HEADER_LENGTH);
 661             if (looks_like_valid_sccp(PINFO_FD_NUM(pinfo), payload, ITU_STANDARD)) {
 662                 return ITU_STANDARD;
 663             }
 664             payload = tvb_new_subset(tvb, ANSI_HEADER_LENGTH, len-ANSI_HEADER_LENGTH, len-ANSI_HEADER_LENGTH);
 665             if (looks_like_valid_sccp(PINFO_FD_NUM(pinfo), payload, ANSI_STANDARD)) {
 666                 return ANSI_STANDARD;
 667             }
 668             payload = tvb_new_subset(tvb, ANSI_HEADER_LENGTH, len-ANSI_HEADER_LENGTH, len-ANSI_HEADER_LENGTH);
 669             if (looks_like_valid_sccp(PINFO_FD_NUM(pinfo), payload, CHINESE_ITU_STANDARD)) {
 670                 return CHINESE_ITU_STANDARD;
 671             }
 672             payload = tvb_new_subset(tvb, JAPAN_HEADER_LENGTH, len-JAPAN_HEADER_LENGTH, len-JAPAN_HEADER_LENGTH);
 673             if (looks_like_valid_sccp(PINFO_FD_NUM(pinfo), payload, JAPAN_STANDARD)) {
 674                 return JAPAN_STANDARD;
 675             }
 676
 677             return HEURISTIC_FAILED_STANDARD;
 678
 679         }
 680     default:
 681         return HEURISTIC_FAILED_STANDARD;
 682     }
 683
 684 }
 685
 686 static const value_string mtp3_standard_vals[] = {
 687         { ITU_STANDARD,                 "ITU_STANDARD" },
 688         { ANSI_STANDARD,                "ANSI_STANDARD" },
 689         { CHINESE_ITU_STANDARD,         "CHINESE_ITU_STANDARD" },
 690         { JAPAN_STANDARD,               "JAPAN_STANDARD" },
 691         { 0,    NULL }
 692 };
 693
 694 /* Code to actually dissect the packets */
 695 static void
 696 dissect_mtp3(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 697 {
 698     void* pd_save;
 699     mtp3_tap_rec_t* tap_rec = ep_alloc0(sizeof(mtp3_tap_rec_t));
 700     guint heuristic_standard, pref_mtp3_standard;
 701     guint8 si;
 702
 703     /* Set up structures needed to add the protocol subtree and manage it */
 704     proto_item *mtp3_item = NULL, *gen_item;
 705     proto_tree *mtp3_tree = NULL;
 706
 707     pref_mtp3_standard = mtp3_standard;
 708
 709     mtp3_item = proto_tree_add_item(tree, proto_mtp3, tvb, 0, 0, ENC_NA);
 710
 711     si = tvb_get_guint8(tvb, SIO_OFFSET) & SERVICE_INDICATOR_MASK;
 712     if (mtp3_heuristic_standard) {
 713         heuristic_standard = heur_mtp3_standard(tvb, pinfo, si);
 714         if (heuristic_standard == HEURISTIC_FAILED_STANDARD) {
 715             gen_item = proto_tree_add_text(tree, tvb, 0, 0, "Could not determine Heuristic using %s", val_to_str(mtp3_standard, mtp3_standard_vals, "unknown"));
 716         } else {
 717             gen_item = proto_tree_add_text(tree, tvb, 0, 0, "%s", val_to_str(heuristic_standard, mtp3_standard_vals, "unknown"));
 718             mtp3_standard = heuristic_standard;
 719         }
 720         PROTO_ITEM_SET_GENERATED(gen_item);
 721 }
 722
 723     /* Make entries in Protocol column on summary display */
 724     switch(mtp3_standard) {
 725     case ITU_STANDARD:
 726         col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP3 (Int. ITU)");
 727         proto_item_set_len(mtp3_item, ITU_HEADER_LENGTH);
 728         break;
 729     case ANSI_STANDARD:
 730         col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP3 (ANSI)");
 731         proto_item_set_len(mtp3_item, ANSI_HEADER_LENGTH);
 732         break;
 733     case CHINESE_ITU_STANDARD:
 734         col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP3 (Chin. ITU)");
 735         proto_item_set_len(mtp3_item, ANSI_HEADER_LENGTH);
 736         break;
 737     case JAPAN_STANDARD:
 738         col_set_str(pinfo->cinfo, COL_PROTOCOL, "MTP3 (Japan)");
 739         proto_item_set_len(mtp3_item, JAPAN_HEADER_LENGTH);
 740         break;
 741     };
 742
 743     if (tree) {
 744         /* create display subtree for the protocol */
 745         mtp3_tree = proto_item_add_subtree(mtp3_item, ett_mtp3);
 746     }
 747
 748     mtp3_addr_opc = ep_alloc0(sizeof(mtp3_addr_pc_t));
 749     mtp3_addr_dpc = ep_alloc0(sizeof(mtp3_addr_pc_t));
 750
 751     /* Dissect the packet (even if !tree so can call sub-dissectors and update
 752     * the source and destination address columns) */
 753     dissect_mtp3_sio(tvb, pinfo, mtp3_tree, &pd_save);
 754     dissect_mtp3_routing_label(tvb, pinfo, mtp3_tree);
 755
 756     memcpy(&(tap_rec->addr_opc),mtp3_addr_opc,sizeof(mtp3_addr_pc_t));
 757     memcpy(&(tap_rec->addr_dpc),mtp3_addr_dpc,sizeof(mtp3_addr_pc_t));
 758
 759     tap_rec->si_code = (tvb_get_guint8(tvb, SIO_OFFSET) & SERVICE_INDICATOR_MASK);
 760     tap_rec->size = tvb_length(tvb);
 761
 762     tap_queue_packet(mtp3_tap, pinfo, tap_rec);
 763
 764     dissect_mtp3_payload(tvb, pinfo, tree);
 765     pinfo->private_data = pd_save;
 766
 767     mtp3_standard = pref_mtp3_standard;
 768
 769 }
 770
 771 void
 772 proto_register_mtp3(void)
 773 {
 774
 775   /* Setup list of header fields  See Section 1.6.1 for details*/
 776   static hf_register_info hf[] = {
 777     { &hf_mtp3_service_indicator,     { "Service indicator",        "mtp3.service_indicator", FT_UINT8,  BASE_HEX,  VALS(mtp3_service_indicator_code_vals), SERVICE_INDICATOR_MASK,     NULL, HFILL }},
 778     { &hf_mtp3_network_indicator,     { "Network indicator",        "mtp3.network_indicator", FT_UINT8,  BASE_HEX,  VALS(network_indicator_vals),           NETWORK_INDICATOR_MASK,     NULL, HFILL }},
 779     { &hf_mtp3_itu_spare,             { "Spare",                    "mtp3.spare",             FT_UINT8,  BASE_HEX,  NULL,                                   SPARE_MASK,                 NULL, HFILL }},
 780     { &hf_mtp3_itu_priority,          { "ITU priority",             "mtp3.priority",          FT_UINT8,  BASE_DEC,  NULL,                                   SPARE_MASK,                 NULL, HFILL }},
 781     { &hf_mtp3_ansi_priority,         { "ANSI Priority",            "mtp3.priority",          FT_UINT8,  BASE_DEC,  NULL,                                   ANSI_PRIORITY_MASK,         NULL, HFILL }},
 782     { &hf_mtp3_itu_opc,               { "OPC",                      "mtp3.opc",               FT_UINT32, BASE_DEC,  NULL,                                   ITU_OPC_MASK,               NULL, HFILL }},
 783     { &hf_mtp3_itu_pc,                { "PC",                       "mtp3.pc",                FT_UINT32, BASE_DEC,  NULL,                                   0x0,                        NULL, HFILL }},
 784     { &hf_mtp3_24bit_pc,              { "PC",                       "mtp3.pc",                FT_UINT32, BASE_DEC,  NULL,                                   ANSI_PC_MASK,               NULL, HFILL }},
 785     { &hf_mtp3_24bit_opc,             { "OPC",                      "mtp3.opc",               FT_UINT32, BASE_DEC,  NULL,                                   ANSI_PC_MASK,               NULL, HFILL }},
 786     { &hf_mtp3_ansi_opc,              { "OPC",                      "mtp3.ansi_opc",          FT_STRING, BASE_NONE, NULL,                                   0x0,                        NULL, HFILL }},
 787     { &hf_mtp3_chinese_opc,           { "OPC",                      "mtp3.chinese_opc",       FT_STRING, BASE_NONE, NULL,                                   0x0,                        NULL, HFILL }},
 788     { &hf_mtp3_opc_network,           { "OPC Network",              "mtp3.opc.network",       FT_UINT24, BASE_DEC,  NULL,                                   ANSI_NETWORK_MASK,          NULL, HFILL }},
 789     { &hf_mtp3_opc_cluster,           { "OPC Cluster",              "mtp3.opc.cluster",       FT_UINT24, BASE_DEC,  NULL,                                   ANSI_CLUSTER_MASK,          NULL, HFILL }},
 790     { &hf_mtp3_opc_member,            { "OPC Member",               "mtp3.opc.member",        FT_UINT24, BASE_DEC,  NULL,                                   ANSI_MEMBER_MASK,           NULL, HFILL }},
 791     { &hf_mtp3_japan_opc,             { "OPC",                      "mtp3.opc",               FT_UINT16, BASE_DEC,  NULL,                                   JAPAN_PC_MASK,              NULL, HFILL }},
 792     { &hf_mtp3_japan_pc,              { "PC",                       "mtp3.pc",                FT_UINT16, BASE_DEC,  NULL,                                   JAPAN_PC_MASK,              NULL, HFILL }},
 793     { &hf_mtp3_itu_dpc,               { "DPC",                      "mtp3.dpc",               FT_UINT32, BASE_DEC,  NULL,                                   ITU_DPC_MASK,               NULL, HFILL }},
 794     { &hf_mtp3_24bit_dpc,             { "DPC",                      "mtp3.dpc",               FT_UINT32, BASE_DEC,  NULL,                                   ANSI_PC_MASK,               NULL, HFILL }},
 795     { &hf_mtp3_ansi_dpc,              { "DPC",                      "mtp3.ansi_dpc",          FT_STRING, BASE_NONE, NULL,                                   0x0,                        NULL, HFILL }},
 796     { &hf_mtp3_chinese_dpc,           { "DPC",                      "mtp3.chinese_dpc",       FT_STRING, BASE_NONE, NULL,                                   0x0,                        NULL, HFILL }},
 797     { &hf_mtp3_dpc_network,           { "DPC Network",              "mtp3.dpc.network",       FT_UINT24, BASE_DEC,  NULL,                                   ANSI_NETWORK_MASK,          NULL, HFILL }},
 798     { &hf_mtp3_dpc_cluster,           { "DPC Cluster",              "mtp3.dpc.cluster",       FT_UINT24, BASE_DEC,  NULL,                                   ANSI_CLUSTER_MASK,          NULL, HFILL }},
 799     { &hf_mtp3_dpc_member,            { "DPC Member",               "mtp3.dpc.member",        FT_UINT24, BASE_DEC,  NULL,                                   ANSI_MEMBER_MASK,           NULL, HFILL }},
 800     { &hf_mtp3_japan_dpc,             { "DPC",                      "mtp3.dpc",               FT_UINT16, BASE_DEC,  NULL,                                   JAPAN_PC_MASK,              NULL, HFILL }},
 801     { &hf_mtp3_itu_sls,               { "Signalling Link Selector", "mtp3.sls",               FT_UINT32, BASE_DEC,  NULL,                                   ITU_SLS_MASK,               NULL, HFILL }},
 802     { &hf_mtp3_japan_4_bit_sls,       { "Signalling Link Selector", "mtp3.sls",               FT_UINT8,  BASE_DEC,  NULL,                                   JAPAN_4_BIT_SLS_MASK,       NULL, HFILL }},
 803     { &hf_mtp3_japan_4_bit_sls_spare, { "SLS Spare",                "mtp3.sls_spare",         FT_UINT8,  BASE_HEX,  NULL,                                   JAPAN_4_BIT_SLS_SPARE_MASK, NULL, HFILL }},
 804     { &hf_mtp3_japan_5_bit_sls,       { "Signalling Link Selector", "mtp3.sls",               FT_UINT8,  BASE_DEC,  NULL,                                   JAPAN_5_BIT_SLS_MASK,       NULL, HFILL }},
 805     { &hf_mtp3_japan_5_bit_sls_spare, { "SLS Spare",                "mtp3.sls_spare",         FT_UINT8,  BASE_HEX,  NULL,                                   JAPAN_5_BIT_SLS_SPARE_MASK, NULL, HFILL }},
 806     { &hf_mtp3_ansi_5_bit_sls,        { "Signalling Link Selector", "mtp3.sls",               FT_UINT8,  BASE_DEC,  NULL,                                   ANSI_5BIT_SLS_MASK,         NULL, HFILL }},
 807     { &hf_mtp3_ansi_8_bit_sls,        { "Signalling Link Selector", "mtp3.sls",               FT_UINT8,  BASE_DEC,  NULL,                                   ANSI_8BIT_SLS_MASK,         NULL, HFILL }},
 808     { &hf_mtp3_chinese_itu_sls,       { "Signalling Link Selector", "mtp3.sls",               FT_UINT8,  BASE_DEC,  NULL,                                   CHINESE_ITU_SLS_MASK,       NULL, HFILL }}
 809   };
 810
 811   /* Setup protocol subtree array */
 812   static gint *ett[] = {
 813     &ett_mtp3,
 814     &ett_mtp3_sio,
 815     &ett_mtp3_label,
 816     &ett_mtp3_label_dpc,
 817     &ett_mtp3_label_opc
 818   };
 819
 820   static enum_val_t mtp3_options[] = {
 821     { "itu",            "ITU",          ITU_STANDARD },
 822     { "ansi",           "ANSI",         ANSI_STANDARD },
 823     { "chinese-itu",    "Chinese ITU",  CHINESE_ITU_STANDARD },
 824     { "japan",          "Japan",        JAPAN_STANDARD },
 825     { NULL, NULL, 0 }
 826   };
 827
 828   static enum_val_t mtp3_addr_fmt_str_e[] = {
 829     { "decimal",        "Decimal",              MTP3_ADDR_FMT_DEC },
 830     { "hexadecimal",    "Hexadecimal",          MTP3_ADDR_FMT_HEX },
 831     { "ni-decimal",     "NI-Decimal",           MTP3_ADDR_FMT_NI_DEC },
 832     { "ni-hexadecimal", "NI-Hexadecimal",       MTP3_ADDR_FMT_NI_HEX },
 833     { "dashed",         "Dashed",               MTP3_ADDR_FMT_DASHED },
 834     { NULL,             NULL,                   0 }
 835   };
 836
 837   static enum_val_t itu_pc_structures[] = {
 838     { "unstructured",   "Unstructured", ITU_PC_STRUCTURE_NONE},
 839     { "3-8-3",          "3-8-3",        ITU_PC_STRUCTURE_3_8_3 },
 840     { "4-3-4-3",        "4-3-4-3",      ITU_PC_STRUCTURE_4_3_4_3 },
 841     { NULL,             NULL,           0 }
 842   };
 843
 844   static enum_val_t japan_pc_structures[] = {
 845     { "unstructured",   "Unstructured", JAPAN_PC_STRUCTURE_NONE},
 846     { "7-4-5",          "7-4-5",        JAPAN_PC_STRUCTURE_7_4_5 },
 847     { "3-4-4-5",        "3-4-4-5",      JAPAN_PC_STRUCTURE_3_4_4_5 },
 848     { NULL,             NULL,           0 }
 849   };
 850
 851  /* Register the protocol name and description */
 852   proto_mtp3 = proto_register_protocol("Message Transfer Part Level 3",
 853                                        "MTP3", "mtp3");
 854   register_dissector("mtp3", dissect_mtp3, proto_mtp3);
 855
 856   /* Required function calls to register the header fields and subtrees used */
 857   proto_register_field_array(proto_mtp3, hf, array_length(hf));
 858   proto_register_subtree_array(ett, array_length(ett));
 859
 860   mtp3_sio_dissector_table = register_dissector_table("mtp3.service_indicator",
 861                                                       "MTP3 Service indicator",
 862                                                       FT_UINT8, BASE_HEX);
 863
 864   mtp3_tap = register_tap("mtp3");
 865
 866   mtp3_module = prefs_register_protocol(proto_mtp3, NULL);
 867
 868   prefs_register_bool_preference(mtp3_module, "heuristic_standard",
 869                                  "Try to determine the MTP3 standard heuristically",
 870                                  "This only works for SCCP traffic for now",
 871                                  &mtp3_heuristic_standard);
 872
 873   prefs_register_enum_preference(mtp3_module, "standard", "MTP3 standard",
 874                                  "The SS7 standard used in MTP3 packets",
 875                                  &mtp3_standard, mtp3_options, FALSE);
 876
 877   prefs_register_enum_preference(mtp3_module, "itu_pc_structure", "ITU Pointcode structure",
 878                                  "The structure of the pointcodes in ITU networks",
 879                                  &itu_pc_structure, itu_pc_structures, FALSE);
 880
 881   prefs_register_enum_preference(mtp3_module, "japan_pc_structure", "Japan Pointcode structure",
 882                                  "The structure of the pointcodes in Japan networks",
 883                                  &japan_pc_structure, japan_pc_structures, FALSE);
 884
 885   prefs_register_bool_preference(mtp3_module, "ansi_5_bit_sls",
 886                                  "Use 5-bit SLS (ANSI only)",
 887                                  "Use 5-bit (instead of 8-bit) SLS in ANSI MTP3 packets",
 888                                  &mtp3_use_ansi_5_bit_sls);
 889
 890   prefs_register_bool_preference(mtp3_module, "japan_5_bit_sls",
 891                                  "Use 5-bit SLS (Japan only)",
 892                                  "Use 5-bit (instead of 4-bit) SLS in Japan MTP3 packets",
 893                                  &mtp3_use_japan_5_bit_sls);
 894
 895   prefs_register_enum_preference(mtp3_module, "addr_format", "Address Format",
 896                                  "Format for point code in the address columns",
 897                                  &mtp3_addr_fmt, mtp3_addr_fmt_str_e, FALSE);
 898
 899   prefs_register_bool_preference(mtp3_module, "itu_priority",
 900                                  "Show MSU priority (national option, ITU and China ITU only)",
 901                                  "Decode the spare bits of the SIO as the MSU priority (a national option in ITU)",
 902                                  &mtp3_show_itu_priority);
 903
 904 }
 905
 906 void
 907 proto_reg_handoff_mtp3(void)
 908 {
 909   dissector_handle_t mtp3_handle;
 910
 911   mtp3_handle = find_dissector("mtp3");
 912   dissector_add_uint("wtap_encap", WTAP_ENCAP_MTP3, mtp3_handle);
 913   dissector_add_string("tali.opcode", "mtp3", mtp3_handle);
 914
 915   data_handle = find_dissector("data");
 916 }