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