epan/dissectors/packet-dua.c

   1 /* packet-dua.c
   2  * Routines for DPNSS/DASS2-User Adaptation Layer dissection
   3  *
   4  * It is hopefully (needs testing) compliant to
   5  *   http://www.ietf.org/internet-drafts/draft-ietf-sigtran-dua-08.txt
   6  *   http://www.ietf.org/internet-drafts/draft-ietf-sigtran-rfc3057bis-02.txt
   7  *
   8  * To do: - provide better handling of length parameters
   9  *
  10  * Copyright 2005, Michael Tuexen <tuexen [AT] fh-muenster.de>
  11  *
  12  * $Id$
  13  *
  14  * Wireshark - Network traffic analyzer
  15  * By Gerald Combs <gerald@wireshark.org>
  16  * Copyright 1998 Gerald Combs
  17  *
  18  * Copied from packet-iua.c
  19  *
  20  * This program is free software; you can redistribute it and/or
  21  * modify it under the terms of the GNU General Public License
  22  * as published by the Free Software Foundation; either version 2
  23  * of the License, or (at your option) any later version.
  24  *
  25  * This program is distributed in the hope that it will be useful,
  26  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  * GNU General Public License for more details.
  29  *
  30  * You should have received a copy of the GNU General Public License
  31  * along with this program; if not, write to the Free Software
  32  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  33  */
  34
  35 #include "config.h"
  36
  37 #include <epan/packet.h>
  38 #include <epan/sctpppids.h>
  39
  40 void proto_register_dua(void);
  41 void proto_reg_handoff_dua(void);
  42
  43 /* Initialize the protocol and registered fields */
  44 static int proto_dua                = -1;
  45 static int hf_int_interface_id      = -1;
  46 static int hf_text_interface_id     = -1;
  47 static int hf_info_string           = -1;
  48 static int hf_dlci_reserved         = -1;
  49 static int hf_dlci_v_bit            = -1;
  50 static int hf_dlci_zero_bit         = -1;
  51 static int hf_dlci_channel          = -1;
  52 static int hf_dlci_one_bit          = -1;
  53 static int hf_dlci_spare            = -1;
  54 static int hf_diag_info             = -1;
  55 static int hf_interface_range_start = -1;
  56 static int hf_interface_range_end   = -1;
  57 static int hf_heartbeat_data        = -1;
  58 static int hf_traffic_mode_type     = -1;
  59 static int hf_error_code            = -1;
  60 static int hf_status_type           = -1;
  61 static int hf_status_id             = -1;
  62 static int hf_release_reason        = -1;
  63 static int hf_tei_status            = -1;
  64 static int hf_asp_id                = -1;
  65 static int hf_states                = -1;
  66 static int hf_parameter_tag         = -1;
  67 static int hf_parameter_length      = -1;
  68 static int hf_parameter_value       = -1;
  69 static int hf_parameter_padding     = -1;
  70 static int hf_version               = -1;
  71 static int hf_reserved              = -1;
  72 static int hf_message_class         = -1;
  73 static int hf_message_type          = -1;
  74 static int hf_message_length        = -1;
  75
  76 /* Initialize the subtree pointers */
  77 static gint ett_dua                 = -1;
  78 static gint ett_dua_parameter       = -1;
  79
  80 static dissector_handle_t data_handle;
  81 static dissector_handle_t dpnss_handle;
  82
  83 #define ADD_PADDING(x) ((((x) + 3) >> 2) << 2)
  84
  85 #define PARAMETER_TAG_LENGTH    2
  86 #define PARAMETER_LENGTH_LENGTH 2
  87 #define PARAMETER_HEADER_LENGTH (PARAMETER_TAG_LENGTH + PARAMETER_LENGTH_LENGTH)
  88
  89 #define PARAMETER_TAG_OFFSET    0
  90 #define PARAMETER_LENGTH_OFFSET (PARAMETER_TAG_OFFSET + PARAMETER_TAG_LENGTH)
  91 #define PARAMETER_VALUE_OFFSET  (PARAMETER_LENGTH_OFFSET + PARAMETER_LENGTH_LENGTH)
  92 #define PARAMETER_HEADER_OFFSET PARAMETER_TAG_OFFSET
  93
  94 #define INT_INTERFACE_ID_OFFSET PARAMETER_VALUE_OFFSET
  95 #define INT_INTERFACE_ID_LENGTH 4
  96
  97 static void
  98 dissect_int_interface_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
  99 {
 100   proto_tree_add_item(parameter_tree, hf_int_interface_id,
 101                       parameter_tvb, INT_INTERFACE_ID_OFFSET, INT_INTERFACE_ID_LENGTH, ENC_BIG_ENDIAN);
 102   proto_item_append_text(parameter_item, " (%d)", tvb_get_ntohl(parameter_tvb, INT_INTERFACE_ID_OFFSET));
 103 }
 104
 105 #define TEXT_INTERFACE_ID_OFFSET PARAMETER_VALUE_OFFSET
 106
 107 static void
 108 dissect_text_interface_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 109 {
 110   guint16 interface_id_length;
 111
 112   interface_id_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 113
 114   proto_tree_add_item(parameter_tree, hf_text_interface_id,
 115                       parameter_tvb, TEXT_INTERFACE_ID_OFFSET, interface_id_length, ENC_ASCII|ENC_NA);
 116   proto_item_append_text(parameter_item, " (%.*s)", interface_id_length,
 117                          tvb_get_string(wmem_packet_scope(), parameter_tvb, TEXT_INTERFACE_ID_OFFSET, interface_id_length));
 118 }
 119
 120 #define INFO_STRING_OFFSET PARAMETER_VALUE_OFFSET
 121
 122 static void
 123 dissect_info_string_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 124 {
 125   guint16 info_string_length;
 126
 127   info_string_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 128   proto_tree_add_item(parameter_tree, hf_info_string,
 129                       parameter_tvb, INFO_STRING_OFFSET, info_string_length, ENC_ASCII|ENC_NA);
 130   proto_item_append_text(parameter_item, " (%.*s)", info_string_length,
 131                          tvb_get_string(wmem_packet_scope(), parameter_tvb, INFO_STRING_OFFSET, info_string_length));
 132 }
 133
 134 #define DLCI_LENGTH  2
 135 #define SPARE_LENGTH 2
 136
 137 #define DLCI_OFFSET  PARAMETER_VALUE_OFFSET
 138 #define SPARE_OFFSET (DLCI_OFFSET + DLCI_LENGTH)
 139
 140 #define RESERVED_BIT_MASK 0xfe00
 141 #define V_BIT_MASK        0x0100
 142 #define ZERO_BIT_MASK     0x0080
 143 #define CHANNEL_BIT_MASK  0x007e
 144 #define ONE_BIT_MASK      0x0001
 145
 146 static void
 147 dissect_dlci_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 148 {
 149   proto_tree_add_item(parameter_tree, hf_dlci_reserved, parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);
 150   proto_tree_add_item(parameter_tree, hf_dlci_v_bit,    parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);
 151   proto_tree_add_item(parameter_tree, hf_dlci_zero_bit, parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);
 152   proto_tree_add_item(parameter_tree, hf_dlci_channel,  parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);
 153   proto_tree_add_item(parameter_tree, hf_dlci_one_bit,  parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);
 154   proto_tree_add_item(parameter_tree, hf_dlci_spare,    parameter_tvb, SPARE_OFFSET, SPARE_LENGTH, ENC_BIG_ENDIAN);
 155 }
 156
 157 static void
 158 dissect_diagnostic_information_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 159 {
 160   guint16 diag_info_length;
 161
 162   diag_info_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 163   proto_tree_add_item(parameter_tree, hf_diag_info, parameter_tvb, PARAMETER_VALUE_OFFSET, diag_info_length, ENC_NA);
 164   proto_item_append_text(parameter_item, " (%u byte%s)", diag_info_length, plurality(diag_info_length, "", "s"));
 165 }
 166
 167 #define START_LENGTH 4
 168 #define END_LENGTH   4
 169 #define INTERVAL_LENGTH (START_LENGTH + END_LENGTH)
 170
 171 #define START_OFFSET 0
 172 #define END_OFFSET   (START_OFFSET + START_LENGTH)
 173
 174 static void
 175 dissect_integer_range_interface_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 176 {
 177   guint16 number_of_ranges, range_number;
 178   gint offset;
 179
 180   number_of_ranges = (tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH) / INTERVAL_LENGTH;
 181   offset = PARAMETER_VALUE_OFFSET;
 182   for(range_number = 0; range_number < number_of_ranges; range_number++) {
 183     proto_tree_add_item(parameter_tree, hf_interface_range_start,
 184                         parameter_tvb, offset + START_OFFSET, START_LENGTH, ENC_BIG_ENDIAN);
 185     proto_tree_add_item(parameter_tree, hf_interface_range_end,
 186                         parameter_tvb, offset + END_OFFSET,   END_LENGTH,   ENC_BIG_ENDIAN);
 187     offset += INTERVAL_LENGTH;
 188   };
 189
 190   proto_item_append_text(parameter_item, " (%u range%s)", number_of_ranges, plurality(number_of_ranges, "", "s"));
 191 }
 192
 193 #define HEARTBEAT_DATA_OFFSET PARAMETER_VALUE_OFFSET
 194
 195 static void
 196 dissect_heartbeat_data_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 197 {
 198   guint16 heartbeat_data_length;
 199
 200   heartbeat_data_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 201   proto_tree_add_item(parameter_tree, hf_heartbeat_data,
 202                       parameter_tvb, HEARTBEAT_DATA_OFFSET, heartbeat_data_length, ENC_NA);
 203   proto_item_append_text(parameter_item, " (%u byte%s)", heartbeat_data_length, plurality(heartbeat_data_length, "", "s"));
 204 }
 205
 206 #define OVER_RIDE_TRAFFIC_MODE_TYPE  1
 207 #define LOAD_SHARE_TRAFFIC_MODE_TYPE 2
 208
 209 static const value_string traffic_mode_type_values[] = {
 210   { OVER_RIDE_TRAFFIC_MODE_TYPE,      "Over-ride" },
 211   { LOAD_SHARE_TRAFFIC_MODE_TYPE,     "Load-share" },
 212   { 0,                    NULL } };
 213
 214 #define TRAFFIC_MODE_TYPE_LENGTH 4
 215 #define TRAFFIC_MODE_TYPE_OFFSET PARAMETER_VALUE_OFFSET
 216
 217 static void
 218 dissect_traffic_mode_type_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 219 {
 220   proto_tree_add_item(parameter_tree, hf_traffic_mode_type,
 221                       parameter_tvb, TRAFFIC_MODE_TYPE_OFFSET, TRAFFIC_MODE_TYPE_LENGTH, ENC_BIG_ENDIAN);
 222   proto_item_append_text(parameter_item, " (%s)",
 223                          val_to_str_const(tvb_get_ntohl(parameter_tvb, TRAFFIC_MODE_TYPE_OFFSET),
 224                                           traffic_mode_type_values, "unknown"));
 225 }
 226
 227 #define INVALID_VERSION_ERROR                         0x01
 228 #define INVALID_INTERFACE_IDENTIFIER_ERROR            0x02
 229 #define UNSUPPORTED_MESSAGE_CLASS_ERROR               0x03
 230 #define UNSUPPORTED_MESSAGE_TYPE_ERROR                0x04
 231 #define UNSUPPORTED_TRAFFIC_HANDLING_MODE_ERROR       0x05
 232 #define UNEXPECTED_MESSAGE_ERROR                      0x06
 233 #define PROTOCOL_ERROR                                0x07
 234 #define UNSUPPORTED_INTERFACE_IDENTIFIER_TYPE_ERROR   0x08
 235 #define INVALID_STREAM_IDENTIFIER_ERROR               0x09
 236 #define REFUSED_MANAGEMENT_BLOCKING_ERROR             0x0d
 237 #define ASP_IDENTIFIER_REQUIRED_ERROR                 0x0e
 238 #define INVALID_ASP_IDENTIFIER_ERROR                  0x0f
 239 #define CHANNEL_NUMBER_OUT_OF_RANGE_ERROR             0x1c
 240 #define CHANNEL_NUMBER_NOT_CONFIGURED                 0x1d
 241
 242 static const value_string error_code_values[] = {
 243   { INVALID_VERSION_ERROR,                       "Invalid version" },
 244   { INVALID_INTERFACE_IDENTIFIER_ERROR,          "Invalid interface identifier" },
 245   { UNSUPPORTED_MESSAGE_CLASS_ERROR,             "Unsupported message class" },
 246   { UNSUPPORTED_MESSAGE_TYPE_ERROR,              "Unsupported message type" },
 247   { UNSUPPORTED_TRAFFIC_HANDLING_MODE_ERROR,     "Unsupported traffic handling mode" },
 248   { UNEXPECTED_MESSAGE_ERROR,                    "Unexpected message" },
 249   { PROTOCOL_ERROR,                              "Protocol error" },
 250   { UNSUPPORTED_INTERFACE_IDENTIFIER_TYPE_ERROR, "Unsupported interface identifier type" },
 251   { INVALID_STREAM_IDENTIFIER_ERROR,             "Invalid stream identifier" },
 252   { REFUSED_MANAGEMENT_BLOCKING_ERROR,           "Refused - Management blocking" },
 253   { ASP_IDENTIFIER_REQUIRED_ERROR,               "ASP identifier required" },
 254   { INVALID_ASP_IDENTIFIER_ERROR,                "Invalid ASP Identifier" },
 255   { CHANNEL_NUMBER_OUT_OF_RANGE_ERROR,           "Channel number out of range" },
 256   { CHANNEL_NUMBER_NOT_CONFIGURED,               "Channel number not configured" },
 257   { 0,                                           NULL } };
 258
 259 #define ERROR_CODE_LENGTH 4
 260 #define ERROR_CODE_OFFSET PARAMETER_VALUE_OFFSET
 261
 262 static void
 263 dissect_error_code_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 264 {
 265   proto_tree_add_item(parameter_tree, hf_error_code,
 266                       parameter_tvb, ERROR_CODE_OFFSET, ERROR_CODE_LENGTH, ENC_BIG_ENDIAN);
 267   proto_item_append_text(parameter_item, " (%s)",
 268                          val_to_str_const(tvb_get_ntohl(parameter_tvb, ERROR_CODE_OFFSET),
 269                                           error_code_values,
 270                                           "unknown"));
 271 }
 272
 273 #define ASP_STATE_CHANGE_STATUS_TYPE  0x01
 274 #define OTHER_STATUS_TYPE             0x02
 275
 276 static const value_string status_type_values[] = {
 277   { ASP_STATE_CHANGE_STATUS_TYPE,        "Application server state change" },
 278   { OTHER_STATUS_TYPE,                   "Other" },
 279   { 0,                                   NULL } };
 280
 281 #define AS_DOWN_STATUS_IDENT          0x01
 282 #define AS_INACTIVE_STATUS_IDENT      0x02
 283 #define AS_ACTIVE_STATUS_IDENT        0x03
 284 #define AS_PENDING_STATUS_IDENT       0x04
 285
 286 #define INSUFFICIENT_ASP_RESOURCES_STATUS_IDENT 0x01
 287 #define ALTERNATE_ASP_ACTIVE_STATUS_IDENT       0x02
 288
 289 static const value_string status_type_id_values[] = {
 290   { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_DOWN_STATUS_IDENT,         "Application server down" },
 291   { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_INACTIVE_STATUS_IDENT,     "Application server inactive" },
 292   { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_ACTIVE_STATUS_IDENT,       "Application server active" },
 293   { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_PENDING_STATUS_IDENT,      "Application server pending" },
 294   { OTHER_STATUS_TYPE * 256 * 256 + INSUFFICIENT_ASP_RESOURCES_STATUS_IDENT, "Insufficient ASP resources active in AS" },
 295   { OTHER_STATUS_TYPE * 256 * 256 + ALTERNATE_ASP_ACTIVE_STATUS_IDENT,       "Alternate ASP active" },
 296   { 0,                                           NULL } };
 297
 298 #define STATUS_TYPE_LENGTH  2
 299 #define STATUS_IDENT_LENGTH 2
 300 #define STATUS_TYPE_OFFSET  PARAMETER_VALUE_OFFSET
 301 #define STATUS_IDENT_OFFSET (STATUS_TYPE_OFFSET + STATUS_TYPE_LENGTH)
 302
 303 static void
 304 dissect_status_type_identification_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 305 {
 306   guint16 status_type, status_id;
 307
 308   status_type = tvb_get_ntohs(parameter_tvb, STATUS_TYPE_OFFSET);
 309   status_id   = tvb_get_ntohs(parameter_tvb, STATUS_IDENT_OFFSET);
 310
 311   proto_tree_add_item(parameter_tree, hf_status_type,
 312                       parameter_tvb, STATUS_TYPE_OFFSET, STATUS_TYPE_LENGTH, ENC_BIG_ENDIAN);
 313   proto_tree_add_uint_format_value(parameter_tree, hf_status_id,  parameter_tvb, STATUS_IDENT_OFFSET, STATUS_IDENT_LENGTH,
 314                              status_id, "%u (%s)", status_id,
 315                              val_to_str_const(status_type * 256 * 256 + status_id, status_type_id_values, "unknown"));
 316
 317   proto_item_append_text(parameter_item, " (%s)",
 318                          val_to_str_const(status_type * 256 * 256 + status_id,
 319                                           status_type_id_values,
 320                                           "unknown status information"));
 321 }
 322
 323 #define PROTOCOL_DATA_OFFSET PARAMETER_VALUE_OFFSET
 324
 325 static void
 326 dissect_protocol_data_parameter(tvbuff_t *parameter_tvb, proto_item *parameter_item, packet_info *pinfo, proto_tree *tree)
 327 {
 328   guint16 protocol_data_length;
 329   tvbuff_t *protocol_data_tvb;
 330
 331   protocol_data_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 332   protocol_data_tvb    = tvb_new_subset(parameter_tvb, PROTOCOL_DATA_OFFSET, protocol_data_length, protocol_data_length);
 333   if(dpnss_handle){
 334     call_dissector(dpnss_handle, protocol_data_tvb, pinfo, tree);
 335     return;
 336   }
 337
 338   call_dissector(data_handle, protocol_data_tvb, pinfo, tree);
 339
 340   proto_item_append_text(parameter_item, " (%u byte%s)", protocol_data_length, plurality(protocol_data_length, "", "s"));
 341 }
 342
 343 #define RELEASE_MGMT_REASON   0
 344 #define RELEASE_PHYS_REASON   1
 345 #define RELEASE_DM_REASON     2
 346 #define RELEASE_OTHER_REASON  3
 347
 348 static const value_string release_reason_values[] = {
 349   { RELEASE_MGMT_REASON,  "Management layer generated release" },
 350   { RELEASE_PHYS_REASON,  "Physical layer alarm generated release" },
 351   { RELEASE_DM_REASON,    "Layer 2 should release" },
 352   { RELEASE_OTHER_REASON, "Other reason" },
 353   { 0,                    NULL } };
 354
 355 #define RELEASE_REASON_OFFSET PARAMETER_VALUE_OFFSET
 356 #define RELEASE_REASON_LENGTH 4
 357
 358 static void
 359 dissect_release_reason_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 360 {
 361   proto_tree_add_item(parameter_tree, hf_release_reason,
 362                       parameter_tvb, RELEASE_REASON_OFFSET, RELEASE_REASON_LENGTH, ENC_BIG_ENDIAN);
 363   proto_item_append_text(parameter_item, " (%s)",
 364                          val_to_str_const(tvb_get_ntohl(parameter_tvb, RELEASE_REASON_OFFSET),
 365                                           release_reason_values,
 366                                           "unknown"));
 367 }
 368
 369 #define TEI_STATUS_ASSIGNED       0
 370 #define TEI_STATUS_UNASSIGNED     1
 371
 372 static const value_string tei_status_values[] = {
 373   { TEI_STATUS_ASSIGNED,   "TEI is considered assigned by Q.921" },
 374   { TEI_STATUS_UNASSIGNED, "TEI is considered unassigned by Q.921" },
 375   { 0,                    NULL } };
 376
 377 #define TEI_STATUS_LENGTH 4
 378 #define TEI_STATUS_OFFSET PARAMETER_VALUE_OFFSET
 379
 380 static void
 381 dissect_tei_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 382 {
 383   proto_tree_add_item(parameter_tree, hf_tei_status,
 384                       parameter_tvb, TEI_STATUS_OFFSET, TEI_STATUS_LENGTH, ENC_BIG_ENDIAN);
 385   proto_item_append_text(parameter_item, " (%s)",
 386                       val_to_str_const(tvb_get_ntohl(parameter_tvb, TEI_STATUS_OFFSET),
 387                                        tei_status_values,
 388                                        "unknown"));
 389 }
 390
 391 #define ASP_ID_LENGTH 4
 392 #define ASP_ID_OFFSET PARAMETER_VALUE_OFFSET
 393
 394 static void
 395 dissect_asp_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 396 {
 397   proto_tree_add_item(parameter_tree, hf_asp_id, parameter_tvb, ASP_ID_OFFSET, ASP_ID_LENGTH, ENC_BIG_ENDIAN);
 398   proto_item_append_text(parameter_item, " (%u)", tvb_get_ntohl(parameter_tvb, ASP_ID_OFFSET));
 399 }
 400
 401 static void
 402 dissect_dlc_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item _U_)
 403 {
 404   guint16 parameter_value_length;
 405
 406   /* FIXME: This can be done better */
 407   parameter_value_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 408   if (parameter_value_length > 0)
 409     proto_tree_add_item(parameter_tree,
 410                         hf_states, parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, ENC_NA);
 411 }
 412
 413 static void
 414 dissect_unknown_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 415 {
 416   guint16 parameter_value_length;
 417
 418   parameter_value_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 419   if (parameter_value_length > 0)
 420     proto_tree_add_item(parameter_tree, hf_parameter_value,
 421                         parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, ENC_NA);
 422   proto_item_append_text(parameter_item, " with tag %u and %u byte%s value",
 423                          tvb_get_ntohs(parameter_tvb, PARAMETER_TAG_OFFSET),
 424                          parameter_value_length, plurality(parameter_value_length, "", "s"));
 425 }
 426
 427 #define INT_INTERFACE_IDENTIFIER_PARAMETER_TAG           0x01
 428 #define TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG          0x03
 429 #define INFO_PARAMETER_TAG                               0x04
 430 #define DLCI_PARAMETER_TAG                               0x05
 431 #define DIAGNOSTIC_INFORMATION_PARAMETER_TAG             0x07
 432 #define INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG 0x08
 433 #define HEARTBEAT_DATA_PARAMETER_TAG                     0x09
 434 #define TRAFFIC_MODE_TYPE_PARAMETER_TAG                  0x0b
 435 #define ERROR_CODE_PARAMETER_TAG                         0x0c
 436 #define STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG        0x0d
 437 #define PROTOCOL_DATA_PARAMETER_TAG                      0x0e
 438 #define RELEASE_REASON_PARAMETER_TAG                     0x0f
 439 #define TEI_STATUS_PARAMETER_TAG                         0x10
 440 #define ASP_IDENTIFIER_PARAMETER_TAG                     0x11
 441 #define DLC_STATUS_PARAMETER_TAG                         0x12
 442
 443 static const value_string parameter_tag_values[] = {
 444   { INT_INTERFACE_IDENTIFIER_PARAMETER_TAG,                "Integer interface identifier" },
 445   { TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG,               "Text interface identifier" },
 446   { INFO_PARAMETER_TAG,                                    "Info" },
 447   { DLCI_PARAMETER_TAG,                                    "DLCI" },
 448   { DIAGNOSTIC_INFORMATION_PARAMETER_TAG,                  "Diagnostic information" },
 449   { INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG,      "Integer range interface identifier" },
 450   { HEARTBEAT_DATA_PARAMETER_TAG,                          "Heartbeat data" },
 451   { TRAFFIC_MODE_TYPE_PARAMETER_TAG,                       "Traffic mode type" },
 452   { ERROR_CODE_PARAMETER_TAG,                              "Error code" },
 453   { STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG,             "Status type/identification" },
 454   { PROTOCOL_DATA_PARAMETER_TAG,                           "Protocol data" },
 455   { RELEASE_REASON_PARAMETER_TAG,                          "Reason" },
 456   { TEI_STATUS_PARAMETER_TAG,                              "TEI status" },
 457   { ASP_IDENTIFIER_PARAMETER_TAG,                          "ASP identifier"},
 458   { DLC_STATUS_PARAMETER_TAG,                              "DLC status" },
 459   { 0,                                                     NULL } };
 460
 461 static void
 462 dissect_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *dua_tree)
 463 {
 464   guint16 tag, length, padding_length;
 465   proto_item *parameter_item;
 466   proto_tree *parameter_tree;
 467
 468   /* extract tag and length from the parameter */
 469   tag            = tvb_get_ntohs(parameter_tvb, PARAMETER_TAG_OFFSET);
 470   length         = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
 471   padding_length = tvb_length(parameter_tvb) - length;
 472
 473   /* create proto_tree stuff */
 474   parameter_item   = proto_tree_add_text(dua_tree, parameter_tvb, PARAMETER_HEADER_OFFSET,
 475                                          tvb_length(parameter_tvb), "%s",
 476                                          val_to_str_const(tag, parameter_tag_values, "Unknown parameter"));
 477   parameter_tree   = proto_item_add_subtree(parameter_item, ett_dua_parameter);
 478
 479   /* add tag and length to the dua tree */
 480   proto_tree_add_item(parameter_tree, hf_parameter_tag,
 481                       parameter_tvb, PARAMETER_TAG_OFFSET, PARAMETER_TAG_LENGTH, ENC_BIG_ENDIAN);
 482   proto_tree_add_item(parameter_tree, hf_parameter_length,
 483                       parameter_tvb, PARAMETER_LENGTH_OFFSET, PARAMETER_LENGTH_LENGTH, ENC_BIG_ENDIAN);
 484
 485   switch(tag) {
 486   case INT_INTERFACE_IDENTIFIER_PARAMETER_TAG:
 487     dissect_int_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
 488     break;
 489   case TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG:
 490     dissect_text_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
 491     break;
 492   case INFO_PARAMETER_TAG:
 493     dissect_info_string_parameter(parameter_tvb, parameter_tree, parameter_item);
 494     break;
 495   case DLCI_PARAMETER_TAG:
 496     dissect_dlci_parameter(parameter_tvb, parameter_tree);
 497     break;
 498   case DIAGNOSTIC_INFORMATION_PARAMETER_TAG:
 499     dissect_diagnostic_information_parameter(parameter_tvb, parameter_tree, parameter_item);
 500     break;
 501   case INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG:
 502     dissect_integer_range_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
 503     break;
 504   case HEARTBEAT_DATA_PARAMETER_TAG:
 505     dissect_heartbeat_data_parameter(parameter_tvb, parameter_tree, parameter_item);
 506     break;
 507   case TRAFFIC_MODE_TYPE_PARAMETER_TAG:
 508     dissect_traffic_mode_type_parameter(parameter_tvb, parameter_tree, parameter_item);
 509     break;
 510   case ERROR_CODE_PARAMETER_TAG:
 511     dissect_error_code_parameter(parameter_tvb, parameter_tree, parameter_item);
 512     break;
 513   case STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG:
 514     dissect_status_type_identification_parameter(parameter_tvb, parameter_tree, parameter_item);
 515     break;
 516   case PROTOCOL_DATA_PARAMETER_TAG:
 517     dissect_protocol_data_parameter(parameter_tvb, parameter_item, pinfo, tree);
 518     break;
 519   case RELEASE_REASON_PARAMETER_TAG:
 520     dissect_release_reason_parameter(parameter_tvb, parameter_tree, parameter_item);
 521     break;
 522   case TEI_STATUS_PARAMETER_TAG:
 523     dissect_tei_status_parameter(parameter_tvb, parameter_tree, parameter_item);
 524     break;
 525   case ASP_IDENTIFIER_PARAMETER_TAG:
 526     dissect_asp_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
 527     break;
 528   case DLC_STATUS_PARAMETER_TAG:
 529     dissect_dlc_status_parameter(parameter_tvb, parameter_tree, parameter_item);
 530     break;
 531   default:
 532     dissect_unknown_parameter(parameter_tvb, parameter_tree, parameter_item);
 533     break;
 534   };
 535
 536   if (padding_length > 0)
 537     proto_tree_add_item(parameter_tree, hf_parameter_padding,
 538                         parameter_tvb, PARAMETER_HEADER_OFFSET + length, padding_length, ENC_NA);
 539 }
 540
 541 static void
 542 dissect_parameters(tvbuff_t *parameters_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *dua_tree)
 543 {
 544   gint offset, length, total_length, remaining_length;
 545   tvbuff_t *parameter_tvb;
 546
 547   offset = 0;
 548   while((remaining_length = tvb_length_remaining(parameters_tvb, offset))) {
 549     length       = tvb_get_ntohs(parameters_tvb, offset + PARAMETER_LENGTH_OFFSET);
 550     total_length = ADD_PADDING(length);
 551     if (remaining_length >= length)
 552       total_length = MIN(total_length, remaining_length);
 553     /* create a tvb for the parameter including the padding bytes */
 554     parameter_tvb  = tvb_new_subset(parameters_tvb, offset, total_length, total_length);
 555     dissect_parameter(parameter_tvb, pinfo, tree, dua_tree);
 556     /* get rid of the handled parameter */
 557     offset += total_length;
 558   }
 559 }
 560
 561 #define VERSION_LENGTH         1
 562 #define RESERVED_LENGTH        1
 563 #define MESSAGE_CLASS_LENGTH   1
 564 #define MESSAGE_TYPE_LENGTH    1
 565 #define MESSAGE_LENGTH_LENGTH  4
 566 #define COMMON_HEADER_LENGTH   (VERSION_LENGTH + RESERVED_LENGTH + MESSAGE_CLASS_LENGTH + \
 567                                 MESSAGE_TYPE_LENGTH + MESSAGE_LENGTH_LENGTH)
 568
 569 #define COMMON_HEADER_OFFSET   0
 570 #define VERSION_OFFSET         COMMON_HEADER_OFFSET
 571 #define RESERVED_OFFSET        (VERSION_OFFSET + VERSION_LENGTH)
 572 #define MESSAGE_CLASS_OFFSET   (RESERVED_OFFSET + RESERVED_LENGTH)
 573 #define MESSAGE_TYPE_OFFSET    (MESSAGE_CLASS_OFFSET + MESSAGE_CLASS_LENGTH)
 574 #define MESSAGE_LENGTH_OFFSET  (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)
 575 #define PARAMETERS_OFFSET      (COMMON_HEADER_OFFSET + COMMON_HEADER_LENGTH)
 576
 577 #define PROTOCOL_VERSION_RELEASE_1             1
 578
 579 static const value_string protocol_version_values[] = {
 580   { PROTOCOL_VERSION_RELEASE_1,  "Release 1" },
 581   { 0,                           NULL } };
 582
 583 #define MESSAGE_CLASS_MGMT_MESSAGE        0
 584 #define MESSAGE_CLASS_ASPSM_MESSAGE       3
 585 #define MESSAGE_CLASS_ASPTM_MESSAGE       4
 586 #define MESSAGE_CLASS_DPTM_MESSAGE       13
 587
 588 static const value_string message_class_values[] = {
 589   { MESSAGE_CLASS_MGMT_MESSAGE,   "Management messages" },
 590   { MESSAGE_CLASS_ASPSM_MESSAGE,  "ASP state maintenance messages" },
 591   { MESSAGE_CLASS_ASPTM_MESSAGE,  "ASP traffic maintenance messages" },
 592   { MESSAGE_CLASS_DPTM_MESSAGE,   "DPNSS/DASS2 boundary primitive transport messages" },
 593   { 0,                             NULL } };
 594
 595 /* message types for MGMT messages */
 596 #define MESSAGE_TYPE_ERR                  0
 597 #define MESSAGE_TYPE_NTFY                 1
 598 #define MESSAGE_TYPE_DLC_STAT_REQ         5
 599 #define MESSAGE_TYPE_DLC_STAT_CON         6
 600 #define MESSAGE_TYPE_DLC_STAT_IND         7
 601
 602 /* message types for ASPSM messages */
 603 #define MESSAGE_TYPE_UP                   1
 604 #define MESSAGE_TYPE_DOWN                 2
 605 #define MESSAGE_TYPE_BEAT                 3
 606 #define MESSAGE_TYPE_UP_ACK               4
 607 #define MESSAGE_TYPE_DOWN_ACK             5
 608 #define MESSAGE_TYPE_BEAT_ACK             6
 609
 610 /* message types for ASPTM messages */
 611 #define MESSAGE_TYPE_ACTIVE               1
 612 #define MESSAGE_TYPE_INACTIVE             2
 613 #define MESSAGE_TYPE_ACTIVE_ACK           3
 614 #define MESSAGE_TYPE_INACTIVE_ACK         4
 615
 616 /* message types for DPTM messages */
 617 #define MESSAGE_TYPE_DATA_REQUEST         1
 618 #define MESSAGE_TYPE_DATA_INDICATION      2
 619 #define MESSAGE_TYPE_ESTABLISH_REQUEST    5
 620 #define MESSAGE_TYPE_ESTABLISH_CONFIRM    6
 621 #define MESSAGE_TYPE_ESTABLISH_INDICATION 7
 622 #define MESSAGE_TYPE_RELEASE_REQUEST      8
 623 #define MESSAGE_TYPE_RELEASE_CONFIRM      9
 624 #define MESSAGE_TYPE_RELEASE_INDICATION  10
 625
 626
 627 static const value_string message_class_type_values[] = {
 628   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_ERR,                  "Error" },
 629   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_NTFY,                 "Notify" },
 630   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_REQ,         "DLC status request" },
 631   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_CON,         "DLC status confirm" },
 632   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_IND,         "DLC status indication" },
 633   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP,                   "ASP up" },
 634   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN,                 "ASP down" },
 635   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT,                 "Heartbeat" },
 636   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP_ACK,               "ASP up ack" },
 637   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN_ACK,             "ASP down ack" },
 638   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT_ACK,             "Heartbeat ack" },
 639   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE ,              "ASP active" },
 640   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE ,            "ASP inactive" },
 641   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE_ACK ,          "ASP active ack" },
 642   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE_ACK ,        "ASP inactive ack" },
 643   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_REQUEST,         "Data request" },
 644   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_INDICATION,      "Data indication" },
 645   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_REQUEST,    "Establish request" },
 646   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_CONFIRM,    "Establish confirmation" },
 647   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_INDICATION, "Establish indication" },
 648   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_REQUEST,      "Release request" },
 649   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_CONFIRM,      "Release confirmation" },
 650   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_INDICATION,   "Release indication" },
 651   { 0,                                                                     NULL } };
 652
 653 static const value_string message_class_type_acro_values[] = {
 654   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_ERR,                  "ERR" },
 655   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_NTFY,                 "NTFY" },
 656   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_REQ,         "DLC_STAT_REQ" },
 657   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_CON,         "DLC_STAT_CON" },
 658   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_IND,         "DLC_STAT_IND" },
 659   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP,                   "ASP_UP" },
 660   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN,                 "ASP_DOWN" },
 661   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT,                 "BEAT" },
 662   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP_ACK,               "ASP_UP_ACK" },
 663   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN_ACK,             "ASP_DOWN_ACK" },
 664   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT_ACK,             "BEAT_ACK" },
 665   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE ,              "ASP_ACTIVE" },
 666   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE ,            "ASP_INACTIVE" },
 667   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE_ACK ,          "ASP_ACTIVE_ACK" },
 668   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE_ACK ,        "ASP_INACTIVE_ACK" },
 669   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_REQUEST,         "DATA_REQ" },
 670   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_INDICATION,      "DATA_IND" },
 671   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_REQUEST,    "EST_REQ" },
 672   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_CONFIRM,    "EST_CON" },
 673   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_INDICATION, "EST_IND" },
 674   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_REQUEST,      "REL_REQ" },
 675   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_CONFIRM,      "REL_CON" },
 676   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_INDICATION,   "REL_IND" },
 677   { 0,                                                                     NULL } };
 678
 679 static void
 680 dissect_common_header(tvbuff_t *common_header_tvb, packet_info *pinfo, proto_tree *dua_tree)
 681 {
 682   guint8 message_class, message_type;
 683
 684   message_class  = tvb_get_guint8(common_header_tvb, MESSAGE_CLASS_OFFSET);
 685   message_type   = tvb_get_guint8(common_header_tvb, MESSAGE_TYPE_OFFSET);
 686
 687   col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str_const(message_class * 256 + message_type,
 688                                                                  message_class_type_acro_values,
 689                                                                  "Unknown"));
 690
 691   if (dua_tree) {
 692     /* add the components of the common header to the protocol tree */
 693     proto_tree_add_item(dua_tree, hf_version, common_header_tvb, VERSION_OFFSET, VERSION_LENGTH, ENC_BIG_ENDIAN);
 694     proto_tree_add_item(dua_tree, hf_reserved, common_header_tvb, RESERVED_OFFSET, RESERVED_LENGTH, ENC_BIG_ENDIAN);
 695     proto_tree_add_item(dua_tree, hf_message_class,
 696                         common_header_tvb, MESSAGE_CLASS_OFFSET, MESSAGE_CLASS_LENGTH, ENC_BIG_ENDIAN);
 697     proto_tree_add_uint_format_value(dua_tree, hf_message_type,
 698                                common_header_tvb, MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH,
 699                                message_type, "%u (%s)",
 700                                message_type, val_to_str_const(message_class * 256 + message_type,
 701                                                               message_class_type_values,
 702                                                               "reserved"));
 703     proto_tree_add_item(dua_tree, hf_message_length,
 704                         common_header_tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH, ENC_BIG_ENDIAN);
 705   }
 706 }
 707
 708 static void
 709 dissect_dua_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *dua_tree)
 710 {
 711   tvbuff_t *common_header_tvb, *parameters_tvb;
 712
 713   common_header_tvb = tvb_new_subset(message_tvb, COMMON_HEADER_OFFSET, COMMON_HEADER_LENGTH, COMMON_HEADER_LENGTH);
 714   parameters_tvb    = tvb_new_subset_remaining(message_tvb, PARAMETERS_OFFSET);
 715   dissect_common_header(common_header_tvb, pinfo, dua_tree);
 716   dissect_parameters(parameters_tvb, pinfo, tree, dua_tree);
 717 }
 718
 719 static void
 720 dissect_dua(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree)
 721 {
 722   proto_item *dua_item;
 723   proto_tree *dua_tree;
 724
 725   /* make entry in the Protocol column on summary display */
 726   col_set_str(pinfo->cinfo, COL_PROTOCOL, "DUA");
 727
 728   /* In the interest of speed, if "tree" is NULL, don't do any work not
 729      necessary to generate protocol tree items. */
 730   if (tree) {
 731     /* create the m3ua protocol tree */
 732     dua_item = proto_tree_add_item(tree, proto_dua, message_tvb, 0, -1, ENC_NA);
 733     dua_tree = proto_item_add_subtree(dua_item, ett_dua);
 734   } else {
 735     dua_tree = NULL;
 736   };
 737   /* dissect the message */
 738   dissect_dua_message(message_tvb, pinfo, tree, dua_tree);
 739 }
 740
 741 /* Register the protocol with Wireshark */
 742 void
 743 proto_register_dua(void)
 744 {
 745
 746   /* Setup list of header fields */
 747   static hf_register_info hf[] = {
 748     { &hf_int_interface_id,
 749       { "Integer interface identifier", "dua.int_interface_identifier",
 750         FT_UINT32,   BASE_HEX,  NULL,                          0x0,
 751         NULL, HFILL } },
 752
 753     { &hf_text_interface_id,
 754       { "Text interface identifier",    "dua.text_interface_identifier",
 755         FT_STRING,  BASE_NONE, NULL,                           0x0,
 756         NULL, HFILL } },
 757
 758     { &hf_info_string,
 759       { "Info string",                  "dua.info_string",
 760         FT_STRING,  BASE_NONE, NULL,                           0x0,
 761         NULL, HFILL } },
 762
 763     { &hf_dlci_reserved,
 764       { "Reserved",                     "dua.dlci_reserved",
 765         FT_UINT16,  BASE_DEC,  NULL,                           RESERVED_BIT_MASK,
 766         NULL, HFILL } },
 767
 768     { &hf_dlci_v_bit,
 769       { "V-bit",                        "dua.dlci_v_bit",
 770         FT_BOOLEAN, 16,        NULL,                           V_BIT_MASK,
 771         NULL, HFILL } },
 772
 773     { &hf_dlci_zero_bit,
 774       { "Zero bit",                     "dua.dlci_zero_bit",
 775         FT_BOOLEAN, 16,        NULL,                           ZERO_BIT_MASK,
 776         NULL, HFILL } },
 777
 778     { &hf_dlci_channel,
 779       { "Channel",                      "dua.dlci_channel",
 780         FT_UINT16,   BASE_DEC, NULL,                           CHANNEL_BIT_MASK,
 781         NULL, HFILL } },
 782
 783     { &hf_dlci_one_bit,
 784       { "One bit",                      "dua.dlci_one_bit",
 785         FT_BOOLEAN, 16,        NULL,                           ONE_BIT_MASK,
 786         NULL, HFILL } },
 787
 788     { &hf_dlci_spare,
 789       { "Spare",                        "dua.dlci_spare",
 790         FT_UINT16,  BASE_DEC,  NULL,                           0x0,
 791         NULL, HFILL } },
 792
 793     { &hf_diag_info,
 794       { "Diagnostic information",       "dua.diagnostic_information",
 795         FT_BYTES,   BASE_NONE, NULL,                           0x0,
 796         NULL, HFILL } },
 797
 798     { &hf_interface_range_start,
 799       { "Start",                        "dua.interface_range_start",
 800         FT_UINT32,  BASE_DEC,  NULL,                           0x0,
 801         NULL, HFILL } },
 802
 803     { &hf_interface_range_end,
 804       { "End",                          "dua.interface_range_end",
 805         FT_UINT32,  BASE_DEC,  NULL,                           0x0,
 806         NULL, HFILL } },
 807
 808     { &hf_heartbeat_data,
 809       { "Heartbeat data",               "dua.heartbeat_data",
 810         FT_BYTES,   BASE_NONE, NULL,                           0x0,
 811         NULL, HFILL } },
 812
 813     { &hf_traffic_mode_type,
 814       { "Traffic mode type",            "dua.traffic_mode_type",
 815         FT_UINT32,  BASE_HEX,  VALS(traffic_mode_type_values), 0x0,
 816         NULL, HFILL } },
 817
 818     { &hf_error_code,
 819       { "Error code",                   "dua.error_code",
 820         FT_UINT32,  BASE_DEC,  VALS(error_code_values),        0x0,
 821         NULL, HFILL } },
 822
 823     { &hf_status_type,
 824       { "Status type",                  "dua.status_type",
 825         FT_UINT16,  BASE_DEC,  VALS(status_type_values),       0x0,
 826         NULL, HFILL } },
 827
 828     { &hf_status_id,
 829       { "Status identification",        "dua.status_identification",
 830         FT_UINT16,  BASE_DEC,  NULL,                           0x0,
 831         NULL, HFILL } },
 832
 833     { &hf_release_reason,
 834       { "Reason",                       "dua.release_reason",
 835         FT_UINT32,  BASE_HEX,  VALS(release_reason_values),    0x0,
 836         NULL, HFILL } },
 837
 838     { &hf_tei_status,
 839       { "TEI status",                   "dua.tei_status",
 840         FT_UINT32,  BASE_HEX,  VALS(tei_status_values),        0x0,
 841         NULL, HFILL } },
 842
 843     { &hf_asp_id,
 844       { "ASP identifier",               "dua.asp_identifier",
 845         FT_UINT32,  BASE_HEX,  NULL,                           0x0,
 846         NULL, HFILL } },
 847
 848     { &hf_states,
 849       { "States",                       "dua.states",
 850         FT_BYTES,   BASE_NONE, NULL,                           0x0,
 851         NULL, HFILL } },
 852
 853     { &hf_parameter_tag,
 854       { "Parameter Tag",                "dua.parameter_tag",
 855         FT_UINT16,  BASE_DEC,  VALS(parameter_tag_values),     0x0,
 856         NULL, HFILL } },
 857
 858     { &hf_parameter_length,
 859       { "Parameter length",             "dua.parameter_length",
 860         FT_UINT16,  BASE_DEC,  NULL,                           0x0,
 861         NULL, HFILL } },
 862
 863     { &hf_parameter_value,
 864       { "Parameter value",              "dua.parameter_value",
 865         FT_BYTES,   BASE_NONE, NULL,                           0x0,
 866         NULL, HFILL } },
 867
 868     { &hf_parameter_padding,
 869       { "Parameter padding",            "dua.parameter_padding",
 870         FT_BYTES,   BASE_NONE, NULL,                           0x0,
 871         NULL, HFILL } },
 872
 873     { &hf_version,
 874       { "Version",                      "dua.version",
 875         FT_UINT8,   BASE_DEC,  VALS(protocol_version_values),  0x0,
 876         NULL, HFILL } },
 877
 878     { &hf_reserved,
 879       { "Reserved",                     "dua.reserved",
 880         FT_UINT8,   BASE_HEX,  NULL,                           0x0,
 881         NULL, HFILL } },
 882
 883     { &hf_message_class,
 884       { "Message class",                "dua.message_class",
 885         FT_UINT8,   BASE_DEC,  VALS(message_class_values),     0x0,
 886         NULL, HFILL } },
 887
 888     { &hf_message_type,
 889       { "Message Type",                 "dua.message_type",
 890         FT_UINT8,   BASE_DEC,  NULL,                           0x0,
 891         NULL, HFILL } },
 892
 893     { &hf_message_length,
 894       { "Message length",               "dua.message_length",
 895         FT_UINT32,  BASE_DEC,  NULL,                           0x0,
 896         NULL, HFILL } },
 897
 898    };
 899   /* Setup protocol subtree array */
 900   static gint *ett[] = {
 901     &ett_dua,
 902     &ett_dua_parameter,
 903   };
 904
 905   /* Register the protocol name and description */
 906   proto_dua = proto_register_protocol("DPNSS/DASS2-User Adaptation Layer", "DUA", "dua");
 907
 908   /* Required function calls to register the header fields and subtrees used */
 909   proto_register_field_array(proto_dua, hf, array_length(hf));
 910   proto_register_subtree_array(ett, array_length(ett));
 911
 912   /* Allow other dissectors to find this one by name. */
 913   register_dissector("dua", dissect_dua, proto_dua);
 914 }
 915
 916 void
 917 proto_reg_handoff_dua(void)
 918 {
 919   dissector_handle_t dua_handle;
 920
 921   dua_handle   = find_dissector("dua");
 922   data_handle  = find_dissector("data");
 923   dpnss_handle = find_dissector("dpnss");
 924   dissector_add_uint("sctp.ppi", DUA_PAYLOAD_PROTOCOL_ID, dua_handle);
 925 }