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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  33  */
  34
  35 #ifdef HAVE_CONFIG_H
  36 # include "config.h"
  37 #endif
  38
  39 #include <epan/packet.h>
  40 #include <epan/sctpppids.h>
  41
  42 /* Initialize the protocol and registered fields */
  43 static int proto_dua                = -1;
  44 static int hf_int_interface_id      = -1;
  45 static int hf_text_interface_id     = -1;
  46 static int hf_info_string           = -1;
  47 static int hf_dlci_reserved         = -1;
  48 static int hf_dlci_v_bit            = -1;
  49 static int hf_dlci_zero_bit         = -1;
  50 static int hf_dlci_channel          = -1;
  51 static int hf_dlci_one_bit          = -1;
  52 static int hf_dlci_spare            = -1;
  53 static int hf_diag_info             = -1;
  54 static int hf_interface_range_start = -1;
  55 static int hf_interface_range_end   = -1;
  56 static int hf_heartbeat_data        = -1;
  57 static int hf_traffic_mode_type     = -1;
  58 static int hf_error_code            = -1;
  59 static int hf_status_type           = -1;
  60 static int hf_status_id             = -1;
  61 static int hf_release_reason        = -1;
  62 static int hf_tei_status            = -1;
  63 static int hf_asp_id                = -1;
  64 static int hf_states                = -1;
  65 static int hf_parameter_tag         = -1;
  66 static int hf_parameter_length      = -1;
  67 static int hf_parameter_value       = -1;
  68 static int hf_parameter_padding     = -1;
  69 static int hf_version               = -1;
  70 static int hf_reserved              = -1;
  71 static int hf_message_class         = -1;
  72 static int hf_message_type          = -1;
  73 static int hf_message_length        = -1;
  74
  75 /* Initialize the subtree pointers */
  76 static gint ett_dua                 = -1;
  77 static gint ett_dua_parameter       = -1;
  78
  79 static dissector_handle_t data_handle;
  80 static dissector_handle_t dpnss_handle;
  81
  82 #define ADD_PADDING(x) ((((x) + 3) >> 2) << 2)
  83
  84 #define PARAMETER_TAG_LENGTH    2
  85 #define PARAMETER_LENGTH_LENGTH 2
  86 #define PARAMETER_HEADER_LENGTH (PARAMETER_TAG_LENGTH + PARAMETER_LENGTH_LENGTH)
  87
  88 #define PARAMETER_TAG_OFFSET    0
  89 #define PARAMETER_LENGTH_OFFSET (PARAMETER_TAG_OFFSET + PARAMETER_TAG_LENGTH)
  90 #define PARAMETER_VALUE_OFFSET  (PARAMETER_LENGTH_OFFSET + PARAMETER_LENGTH_LENGTH)
  91 #define PARAMETER_HEADER_OFFSET PARAMETER_TAG_OFFSET
  92
  93 #define INT_INTERFACE_ID_OFFSET PARAMETER_VALUE_OFFSET
  94 #define INT_INTERFACE_ID_LENGTH 4
  95
  96 static void
  97 dissect_int_interface_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
  98 {
  99   proto_tree_add_item(parameter_tree, hf_int_interface_id, 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, parameter_tvb, TEXT_INTERFACE_ID_OFFSET, interface_id_length, ENC_ASCII|ENC_NA);
 113   proto_item_append_text(parameter_item, " (%.*s)", interface_id_length,
 114                          tvb_get_ephemeral_string(parameter_tvb, TEXT_INTERFACE_ID_OFFSET, interface_id_length));
 115 }
 116
 117 #define INFO_STRING_OFFSET PARAMETER_VALUE_OFFSET
 118
 119 static void
 120 dissect_info_string_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 121 {
 122   guint16 info_string_length;
 123
 124   info_string_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 125   proto_tree_add_item(parameter_tree, hf_info_string, parameter_tvb, INFO_STRING_OFFSET, info_string_length, ENC_ASCII|ENC_NA);
 126   proto_item_append_text(parameter_item, " (%.*s)", info_string_length,
 127                          tvb_get_ephemeral_string(parameter_tvb, INFO_STRING_OFFSET, info_string_length));
 128 }
 129
 130 #define DLCI_LENGTH  2
 131 #define SPARE_LENGTH 2
 132
 133 #define DLCI_OFFSET  PARAMETER_VALUE_OFFSET
 134 #define SPARE_OFFSET (DLCI_OFFSET + DLCI_LENGTH)
 135
 136 #define RESERVED_BIT_MASK 0xfe00
 137 #define V_BIT_MASK        0x0100
 138 #define ZERO_BIT_MASK     0x0080
 139 #define CHANNEL_BIT_MASK  0x007e
 140 #define ONE_BIT_MASK      0x0001
 141
 142 static void
 143 dissect_dlci_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
 144 {
 145   proto_tree_add_item(parameter_tree, hf_dlci_reserved, parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);
 146   proto_tree_add_item(parameter_tree, hf_dlci_v_bit,    parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);
 147   proto_tree_add_item(parameter_tree, hf_dlci_zero_bit, parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);
 148   proto_tree_add_item(parameter_tree, hf_dlci_channel,  parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);
 149   proto_tree_add_item(parameter_tree, hf_dlci_one_bit,  parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);
 150   proto_tree_add_item(parameter_tree, hf_dlci_spare,    parameter_tvb, SPARE_OFFSET, SPARE_LENGTH, ENC_BIG_ENDIAN);
 151 }
 152
 153 static void
 154 dissect_diagnostic_information_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 155 {
 156   guint16 diag_info_length;
 157
 158   diag_info_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 159   proto_tree_add_item(parameter_tree, hf_diag_info, parameter_tvb, PARAMETER_VALUE_OFFSET, diag_info_length, ENC_NA);
 160   proto_item_append_text(parameter_item, " (%u byte%s)", diag_info_length, plurality(diag_info_length, "", "s"));
 161 }
 162
 163 #define START_LENGTH 4
 164 #define END_LENGTH   4
 165 #define INTERVAL_LENGTH (START_LENGTH + END_LENGTH)
 166
 167 #define START_OFFSET 0
 168 #define END_OFFSET   (START_OFFSET + START_LENGTH)
 169
 170 static void
 171 dissect_integer_range_interface_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 172 {
 173   guint16 number_of_ranges, range_number;
 174   gint offset;
 175
 176   number_of_ranges = (tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH) / INTERVAL_LENGTH;
 177   offset = PARAMETER_VALUE_OFFSET;
 178   for(range_number = 1; range_number <= number_of_ranges; range_number++) {
 179     proto_tree_add_item(parameter_tree, hf_interface_range_start, parameter_tvb, offset + START_OFFSET, START_LENGTH, ENC_BIG_ENDIAN);
 180     proto_tree_add_item(parameter_tree, hf_interface_range_end,   parameter_tvb, offset + END_OFFSET,   END_LENGTH,   ENC_BIG_ENDIAN);
 181     offset += INTERVAL_LENGTH;
 182   };
 183
 184   proto_item_append_text(parameter_item, " (%u range%s)", number_of_ranges, plurality(number_of_ranges, "", "s"));
 185 }
 186
 187 #define HEARTBEAT_DATA_OFFSET PARAMETER_VALUE_OFFSET
 188
 189 static void
 190 dissect_heartbeat_data_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 191 {
 192   guint16 heartbeat_data_length;
 193
 194   heartbeat_data_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 195   proto_tree_add_item(parameter_tree, hf_heartbeat_data, parameter_tvb, HEARTBEAT_DATA_OFFSET, heartbeat_data_length, ENC_NA);
 196   proto_item_append_text(parameter_item, " (%u byte%s)", heartbeat_data_length, plurality(heartbeat_data_length, "", "s"));
 197 }
 198
 199 #define OVER_RIDE_TRAFFIC_MODE_TYPE  1
 200 #define LOAD_SHARE_TRAFFIC_MODE_TYPE 2
 201
 202 static const value_string traffic_mode_type_values[] = {
 203   { OVER_RIDE_TRAFFIC_MODE_TYPE,      "Over-ride" },
 204   { LOAD_SHARE_TRAFFIC_MODE_TYPE,     "Load-share" },
 205   { 0,                    NULL } };
 206
 207 #define TRAFFIC_MODE_TYPE_LENGTH 4
 208 #define TRAFFIC_MODE_TYPE_OFFSET PARAMETER_VALUE_OFFSET
 209
 210 static void
 211 dissect_traffic_mode_type_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 212 {
 213   proto_tree_add_item(parameter_tree, hf_traffic_mode_type, parameter_tvb, TRAFFIC_MODE_TYPE_OFFSET, TRAFFIC_MODE_TYPE_LENGTH, ENC_BIG_ENDIAN);
 214   proto_item_append_text(parameter_item, " (%s)",
 215                          val_to_str(tvb_get_ntohl(parameter_tvb, TRAFFIC_MODE_TYPE_OFFSET), traffic_mode_type_values, "unknown"));
 216 }
 217
 218 #define INVALID_VERSION_ERROR                         0x01
 219 #define INVALID_INTERFACE_IDENTIFIER_ERROR            0x02
 220 #define UNSUPPORTED_MESSAGE_CLASS_ERROR               0x03
 221 #define UNSUPPORTED_MESSAGE_TYPE_ERROR                0x04
 222 #define UNSUPPORTED_TRAFFIC_HANDLING_MODE_ERROR       0x05
 223 #define UNEXPECTED_MESSAGE_ERROR                      0x06
 224 #define PROTOCOL_ERROR                                0x07
 225 #define UNSUPPORTED_INTERFACE_IDENTIFIER_TYPE_ERROR   0x08
 226 #define INVALID_STREAM_IDENTIFIER_ERROR               0x09
 227 #define REFUSED_MANAGEMENT_BLOCKING_ERROR             0x0d
 228 #define ASP_IDENTIFIER_REQUIRED_ERROR                 0x0e
 229 #define INVALID_ASP_IDENTIFIER_ERROR                  0x0f
 230 #define CHANNEL_NUMBER_OUT_OF_RANGE_ERROR             0x1c
 231 #define CHANNEL_NUMBER_NOT_CONFIGURED                 0x1d
 232
 233 static const value_string error_code_values[] = {
 234   { INVALID_VERSION_ERROR,                       "Invalid version" },
 235   { INVALID_INTERFACE_IDENTIFIER_ERROR,          "Invalid interface identifier" },
 236   { UNSUPPORTED_MESSAGE_CLASS_ERROR,             "Unsupported message class" },
 237   { UNSUPPORTED_MESSAGE_TYPE_ERROR,              "Unsupported message type" },
 238   { UNSUPPORTED_TRAFFIC_HANDLING_MODE_ERROR,     "Unsupported traffic handling mode" },
 239   { UNEXPECTED_MESSAGE_ERROR,                    "Unexpected message" },
 240   { PROTOCOL_ERROR,                              "Protocol error" },
 241   { UNSUPPORTED_INTERFACE_IDENTIFIER_TYPE_ERROR, "Unsupported interface identifier type" },
 242   { INVALID_STREAM_IDENTIFIER_ERROR,             "Invalid stream identifier" },
 243   { REFUSED_MANAGEMENT_BLOCKING_ERROR,           "Refused - Management blocking" },
 244   { ASP_IDENTIFIER_REQUIRED_ERROR,               "ASP identifier required" },
 245   { INVALID_ASP_IDENTIFIER_ERROR,                "Invalid ASP Identifier" },
 246   { CHANNEL_NUMBER_OUT_OF_RANGE_ERROR,           "Channel number out of range" },
 247   { CHANNEL_NUMBER_NOT_CONFIGURED,               "Channel number not configured" },
 248   { 0,                                           NULL } };
 249
 250 #define ERROR_CODE_LENGTH 4
 251 #define ERROR_CODE_OFFSET PARAMETER_VALUE_OFFSET
 252
 253 static void
 254 dissect_error_code_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 255 {
 256   proto_tree_add_item(parameter_tree, hf_error_code, parameter_tvb, ERROR_CODE_OFFSET, ERROR_CODE_LENGTH, ENC_BIG_ENDIAN);
 257   proto_item_append_text(parameter_item, " (%s)",
 258                          val_to_str(tvb_get_ntohl(parameter_tvb, ERROR_CODE_OFFSET), error_code_values, "unknown"));
 259 }
 260
 261 #define ASP_STATE_CHANGE_STATUS_TYPE  0x01
 262 #define OTHER_STATUS_TYPE             0x02
 263
 264 static const value_string status_type_values[] = {
 265   { ASP_STATE_CHANGE_STATUS_TYPE,        "Application server state change" },
 266   { OTHER_STATUS_TYPE,                   "Other" },
 267   { 0,                                   NULL } };
 268
 269 #define AS_DOWN_STATUS_IDENT          0x01
 270 #define AS_INACTIVE_STATUS_IDENT      0x02
 271 #define AS_ACTIVE_STATUS_IDENT        0x03
 272 #define AS_PENDING_STATUS_IDENT       0x04
 273
 274 #define INSUFFICIENT_ASP_RESOURCES_STATUS_IDENT 0x01
 275 #define ALTERNATE_ASP_ACTIVE_STATUS_IDENT       0x02
 276
 277 static const value_string status_type_id_values[] = {
 278   { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_DOWN_STATUS_IDENT,         "Application server down" },
 279   { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_INACTIVE_STATUS_IDENT,     "Application server inactive" },
 280   { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_ACTIVE_STATUS_IDENT,       "Application server active" },
 281   { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_PENDING_STATUS_IDENT,      "Application server pending" },
 282   { OTHER_STATUS_TYPE * 256 * 256 + INSUFFICIENT_ASP_RESOURCES_STATUS_IDENT, "Insufficient ASP resources active in AS" },
 283   { OTHER_STATUS_TYPE * 256 * 256 + ALTERNATE_ASP_ACTIVE_STATUS_IDENT,       "Alternate ASP active" },
 284   { 0,                                           NULL } };
 285
 286 #define STATUS_TYPE_LENGTH  2
 287 #define STATUS_IDENT_LENGTH 2
 288 #define STATUS_TYPE_OFFSET  PARAMETER_VALUE_OFFSET
 289 #define STATUS_IDENT_OFFSET (STATUS_TYPE_OFFSET + STATUS_TYPE_LENGTH)
 290
 291 static void
 292 dissect_status_type_identification_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 293 {
 294   guint16 status_type, status_id;
 295
 296   status_type = tvb_get_ntohs(parameter_tvb, STATUS_TYPE_OFFSET);
 297   status_id   = tvb_get_ntohs(parameter_tvb, STATUS_IDENT_OFFSET);
 298
 299   proto_tree_add_item(parameter_tree, hf_status_type, parameter_tvb, STATUS_TYPE_OFFSET, STATUS_TYPE_LENGTH, ENC_BIG_ENDIAN);
 300   proto_tree_add_uint_format(parameter_tree, hf_status_id,  parameter_tvb, STATUS_IDENT_OFFSET, STATUS_IDENT_LENGTH,
 301                              status_id, "Status identification: %u (%s)", status_id,
 302                              val_to_str(status_type * 256 * 256 + status_id, status_type_id_values, "unknown"));
 303
 304   proto_item_append_text(parameter_item, " (%s)",
 305                          val_to_str(status_type * 256 * 256 + status_id, status_type_id_values, "unknown status information"));
 306 }
 307
 308 #define PROTOCOL_DATA_OFFSET PARAMETER_VALUE_OFFSET
 309
 310 static void
 311 dissect_protocol_data_parameter(tvbuff_t *parameter_tvb, proto_item *parameter_item, packet_info *pinfo, proto_tree *tree)
 312 {
 313   guint16 protocol_data_length;
 314   tvbuff_t *protocol_data_tvb;
 315
 316   protocol_data_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 317   protocol_data_tvb    = tvb_new_subset(parameter_tvb, PROTOCOL_DATA_OFFSET, protocol_data_length, protocol_data_length);
 318   if(dpnss_handle){
 319           call_dissector(dpnss_handle, protocol_data_tvb, pinfo, tree);
 320           return;
 321   }
 322
 323   call_dissector(data_handle, protocol_data_tvb, pinfo, tree);
 324
 325   proto_item_append_text(parameter_item, " (%u byte%s)", protocol_data_length, plurality(protocol_data_length, "", "s"));
 326 }
 327
 328 #define RELEASE_MGMT_REASON   0
 329 #define RELEASE_PHYS_REASON   1
 330 #define RELEASE_DM_REASON     2
 331 #define RELEASE_OTHER_REASON  3
 332
 333 static const value_string release_reason_values[] = {
 334   { RELEASE_MGMT_REASON,  "Management layer generated release" },
 335   { RELEASE_PHYS_REASON,  "Physical layer alarm generated release" },
 336   { RELEASE_DM_REASON,    "Layer 2 should release" },
 337   { RELEASE_OTHER_REASON, "Other reason" },
 338   { 0,                    NULL } };
 339
 340 #define RELEASE_REASON_OFFSET PARAMETER_VALUE_OFFSET
 341 #define RELEASE_REASON_LENGTH 4
 342
 343 static void
 344 dissect_release_reason_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 345 {
 346   proto_tree_add_item(parameter_tree, hf_release_reason, parameter_tvb, RELEASE_REASON_OFFSET, RELEASE_REASON_LENGTH, ENC_BIG_ENDIAN);
 347   proto_item_append_text(parameter_item, " (%s)",
 348                          val_to_str(tvb_get_ntohl(parameter_tvb, RELEASE_REASON_OFFSET), release_reason_values, "unknown"));
 349 }
 350
 351 #define TEI_STATUS_ASSIGNED       0
 352 #define TEI_STATUS_UNASSIGNED     1
 353
 354 static const value_string tei_status_values[] = {
 355   { TEI_STATUS_ASSIGNED,   "TEI is considered assigned by Q.921" },
 356   { TEI_STATUS_UNASSIGNED, "TEI is considered unassigned by Q.921" },
 357   { 0,                    NULL } };
 358
 359 #define TEI_STATUS_LENGTH 4
 360 #define TEI_STATUS_OFFSET PARAMETER_VALUE_OFFSET
 361
 362 static void
 363 dissect_tei_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 364 {
 365   proto_tree_add_item(parameter_tree, hf_tei_status, parameter_tvb, TEI_STATUS_OFFSET, TEI_STATUS_LENGTH, ENC_BIG_ENDIAN);
 366   proto_item_append_text(parameter_item, " (%s)",
 367                       val_to_str(tvb_get_ntohl(parameter_tvb, TEI_STATUS_OFFSET), tei_status_values, "unknown"));
 368 }
 369
 370 #define ASP_ID_LENGTH 4
 371 #define ASP_ID_OFFSET PARAMETER_VALUE_OFFSET
 372
 373 static void
 374 dissect_asp_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 375 {
 376   proto_tree_add_item(parameter_tree, hf_asp_id, parameter_tvb, ASP_ID_OFFSET, ASP_ID_LENGTH, ENC_BIG_ENDIAN);
 377   proto_item_append_text(parameter_item, " (%u)", tvb_get_ntohl(parameter_tvb, ASP_ID_OFFSET));
 378 }
 379
 380 static void
 381 dissect_dlc_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item _U_)
 382 {
 383   guint16 parameter_value_length;
 384
 385   /* FIXME: This can be done better */
 386   parameter_value_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 387   if (parameter_value_length > 0)
 388     proto_tree_add_item(parameter_tree, hf_states, parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, ENC_NA);
 389 }
 390
 391 static void
 392 dissect_unknown_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
 393 {
 394   guint16 parameter_value_length;
 395
 396   parameter_value_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
 397   if (parameter_value_length > 0)
 398     proto_tree_add_item(parameter_tree, hf_parameter_value, parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, ENC_NA);
 399   proto_item_append_text(parameter_item, " with tag %u and %u byte%s value",
 400                          tvb_get_ntohs(parameter_tvb, PARAMETER_TAG_OFFSET), parameter_value_length, plurality(parameter_value_length, "", "s"));
 401 }
 402
 403 #define INT_INTERFACE_IDENTIFIER_PARAMETER_TAG           0x01
 404 #define TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG          0x03
 405 #define INFO_PARAMETER_TAG                               0x04
 406 #define DLCI_PARAMETER_TAG                               0x05
 407 #define DIAGNOSTIC_INFORMATION_PARAMETER_TAG             0x07
 408 #define INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG 0x08
 409 #define HEARTBEAT_DATA_PARAMETER_TAG                     0x09
 410 #define TRAFFIC_MODE_TYPE_PARAMETER_TAG                  0x0b
 411 #define ERROR_CODE_PARAMETER_TAG                         0x0c
 412 #define STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG        0x0d
 413 #define PROTOCOL_DATA_PARAMETER_TAG                      0x0e
 414 #define RELEASE_REASON_PARAMETER_TAG                     0x0f
 415 #define TEI_STATUS_PARAMETER_TAG                         0x10
 416 #define ASP_IDENTIFIER_PARAMETER_TAG                     0x11
 417 #define DLC_STATUS_PARAMETER_TAG                         0x12
 418
 419 static const value_string parameter_tag_values[] = {
 420   { INT_INTERFACE_IDENTIFIER_PARAMETER_TAG,                "Integer interface identifier" },
 421   { TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG,               "Text interface identifier" },
 422   { INFO_PARAMETER_TAG,                                    "Info" },
 423   { DLCI_PARAMETER_TAG,                                    "DLCI" },
 424   { DIAGNOSTIC_INFORMATION_PARAMETER_TAG,                  "Diagnostic information" },
 425   { INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG,      "Integer range interface identifier" },
 426   { HEARTBEAT_DATA_PARAMETER_TAG,                          "Heartbeat data" },
 427   { TRAFFIC_MODE_TYPE_PARAMETER_TAG,                       "Traffic mode type" },
 428   { ERROR_CODE_PARAMETER_TAG,                              "Error code" },
 429   { STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG,             "Status type/identification" },
 430   { PROTOCOL_DATA_PARAMETER_TAG,                           "Protocol data" },
 431   { RELEASE_REASON_PARAMETER_TAG,                          "Reason" },
 432   { TEI_STATUS_PARAMETER_TAG,                              "TEI status" },
 433   { ASP_IDENTIFIER_PARAMETER_TAG,                          "ASP identifier"},
 434   { DLC_STATUS_PARAMETER_TAG,                              "DLC status" },
 435   { 0,                                                     NULL } };
 436
 437 static void
 438 dissect_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *dua_tree)
 439 {
 440   guint16 tag, length, padding_length;
 441   proto_item *parameter_item;
 442   proto_tree *parameter_tree;
 443
 444   /* extract tag and length from the parameter */
 445   tag            = tvb_get_ntohs(parameter_tvb, PARAMETER_TAG_OFFSET);
 446   length         = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
 447   padding_length = tvb_length(parameter_tvb) - length;
 448
 449   /* create proto_tree stuff */
 450   parameter_item   = proto_tree_add_text(dua_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, tvb_length(parameter_tvb), "%s",
 451                                          val_to_str(tag, parameter_tag_values, "Unknown parameter"));
 452   parameter_tree   = proto_item_add_subtree(parameter_item, ett_dua_parameter);
 453
 454   /* add tag and length to the dua tree */
 455   proto_tree_add_item(parameter_tree, hf_parameter_tag, parameter_tvb, PARAMETER_TAG_OFFSET, PARAMETER_TAG_LENGTH, ENC_BIG_ENDIAN);
 456   proto_tree_add_item(parameter_tree, hf_parameter_length, parameter_tvb, PARAMETER_LENGTH_OFFSET, PARAMETER_LENGTH_LENGTH, ENC_BIG_ENDIAN);
 457
 458   switch(tag) {
 459   case INT_INTERFACE_IDENTIFIER_PARAMETER_TAG:
 460     dissect_int_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
 461     break;
 462   case TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG:
 463     dissect_text_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
 464     break;
 465   case INFO_PARAMETER_TAG:
 466     dissect_info_string_parameter(parameter_tvb, parameter_tree, parameter_item);
 467     break;
 468   case DLCI_PARAMETER_TAG:
 469     dissect_dlci_parameter(parameter_tvb, parameter_tree);
 470     break;
 471   case DIAGNOSTIC_INFORMATION_PARAMETER_TAG:
 472     dissect_diagnostic_information_parameter(parameter_tvb, parameter_tree, parameter_item);
 473     break;
 474   case INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG:
 475     dissect_integer_range_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
 476     break;
 477   case HEARTBEAT_DATA_PARAMETER_TAG:
 478     dissect_heartbeat_data_parameter(parameter_tvb, parameter_tree, parameter_item);
 479     break;
 480   case TRAFFIC_MODE_TYPE_PARAMETER_TAG:
 481     dissect_traffic_mode_type_parameter(parameter_tvb, parameter_tree, parameter_item);
 482     break;
 483   case ERROR_CODE_PARAMETER_TAG:
 484     dissect_error_code_parameter(parameter_tvb, parameter_tree, parameter_item);
 485     break;
 486   case STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG:
 487     dissect_status_type_identification_parameter(parameter_tvb, parameter_tree, parameter_item);
 488     break;
 489   case PROTOCOL_DATA_PARAMETER_TAG:
 490     dissect_protocol_data_parameter(parameter_tvb, parameter_item, pinfo, tree);
 491     break;
 492   case RELEASE_REASON_PARAMETER_TAG:
 493     dissect_release_reason_parameter(parameter_tvb, parameter_tree, parameter_item);
 494     break;
 495   case TEI_STATUS_PARAMETER_TAG:
 496     dissect_tei_status_parameter(parameter_tvb, parameter_tree, parameter_item);
 497     break;
 498   case ASP_IDENTIFIER_PARAMETER_TAG:
 499     dissect_asp_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);
 500     break;
 501   case DLC_STATUS_PARAMETER_TAG:
 502     dissect_dlc_status_parameter(parameter_tvb, parameter_tree, parameter_item);
 503     break;
 504   default:
 505     dissect_unknown_parameter(parameter_tvb, parameter_tree, parameter_item);
 506     break;
 507   };
 508
 509   if (padding_length > 0)
 510     proto_tree_add_item(parameter_tree, hf_parameter_padding, parameter_tvb, PARAMETER_HEADER_OFFSET + length, padding_length, ENC_NA);
 511 }
 512
 513 static void
 514 dissect_parameters(tvbuff_t *parameters_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *dua_tree)
 515 {
 516   gint offset, length, total_length, remaining_length;
 517   tvbuff_t *parameter_tvb;
 518
 519   offset = 0;
 520   while((remaining_length = tvb_length_remaining(parameters_tvb, offset))) {
 521     length       = tvb_get_ntohs(parameters_tvb, offset + PARAMETER_LENGTH_OFFSET);
 522     total_length = ADD_PADDING(length);
 523     if (remaining_length >= length)
 524       total_length = MIN(total_length, remaining_length);
 525     /* create a tvb for the parameter including the padding bytes */
 526     parameter_tvb  = tvb_new_subset(parameters_tvb, offset, total_length, total_length);
 527     dissect_parameter(parameter_tvb, pinfo, tree, dua_tree);
 528     /* get rid of the handled parameter */
 529     offset += total_length;
 530   }
 531 }
 532
 533 #define VERSION_LENGTH         1
 534 #define RESERVED_LENGTH        1
 535 #define MESSAGE_CLASS_LENGTH   1
 536 #define MESSAGE_TYPE_LENGTH    1
 537 #define MESSAGE_LENGTH_LENGTH  4
 538 #define COMMON_HEADER_LENGTH   (VERSION_LENGTH + RESERVED_LENGTH + MESSAGE_CLASS_LENGTH + \
 539                                 MESSAGE_TYPE_LENGTH + MESSAGE_LENGTH_LENGTH)
 540
 541 #define COMMON_HEADER_OFFSET   0
 542 #define VERSION_OFFSET         COMMON_HEADER_OFFSET
 543 #define RESERVED_OFFSET        (VERSION_OFFSET + VERSION_LENGTH)
 544 #define MESSAGE_CLASS_OFFSET   (RESERVED_OFFSET + RESERVED_LENGTH)
 545 #define MESSAGE_TYPE_OFFSET    (MESSAGE_CLASS_OFFSET + MESSAGE_CLASS_LENGTH)
 546 #define MESSAGE_LENGTH_OFFSET  (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)
 547 #define PARAMETERS_OFFSET      (COMMON_HEADER_OFFSET + COMMON_HEADER_LENGTH)
 548
 549 #define PROTOCOL_VERSION_RELEASE_1             1
 550
 551 static const value_string protocol_version_values[] = {
 552   { PROTOCOL_VERSION_RELEASE_1,  "Release 1" },
 553   { 0,                           NULL } };
 554
 555 #define MESSAGE_CLASS_MGMT_MESSAGE        0
 556 #define MESSAGE_CLASS_ASPSM_MESSAGE       3
 557 #define MESSAGE_CLASS_ASPTM_MESSAGE       4
 558 #define MESSAGE_CLASS_DPTM_MESSAGE       13
 559
 560 static const value_string message_class_values[] = {
 561   { MESSAGE_CLASS_MGMT_MESSAGE,   "Management messages" },
 562   { MESSAGE_CLASS_ASPSM_MESSAGE,  "ASP state maintenance messages" },
 563   { MESSAGE_CLASS_ASPTM_MESSAGE,  "ASP traffic maintenance messages" },
 564   { MESSAGE_CLASS_DPTM_MESSAGE,   "DPNSS/DASS2 boundary primitive transport messages" },
 565   { 0,                             NULL } };
 566
 567 /* message types for MGMT messages */
 568 #define MESSAGE_TYPE_ERR                  0
 569 #define MESSAGE_TYPE_NTFY                 1
 570 #define MESSAGE_TYPE_DLC_STAT_REQ         5
 571 #define MESSAGE_TYPE_DLC_STAT_CON         6
 572 #define MESSAGE_TYPE_DLC_STAT_IND         7
 573
 574 /* message types for ASPSM messages */
 575 #define MESSAGE_TYPE_UP                   1
 576 #define MESSAGE_TYPE_DOWN                 2
 577 #define MESSAGE_TYPE_BEAT                 3
 578 #define MESSAGE_TYPE_UP_ACK               4
 579 #define MESSAGE_TYPE_DOWN_ACK             5
 580 #define MESSAGE_TYPE_BEAT_ACK             6
 581
 582 /* message types for ASPTM messages */
 583 #define MESSAGE_TYPE_ACTIVE               1
 584 #define MESSAGE_TYPE_INACTIVE             2
 585 #define MESSAGE_TYPE_ACTIVE_ACK           3
 586 #define MESSAGE_TYPE_INACTIVE_ACK         4
 587
 588 /* message types for DPTM messages */
 589 #define MESSAGE_TYPE_DATA_REQUEST         1
 590 #define MESSAGE_TYPE_DATA_INDICATION      2
 591 #define MESSAGE_TYPE_ESTABLISH_REQUEST    5
 592 #define MESSAGE_TYPE_ESTABLISH_CONFIRM    6
 593 #define MESSAGE_TYPE_ESTABLISH_INDICATION 7
 594 #define MESSAGE_TYPE_RELEASE_REQUEST      8
 595 #define MESSAGE_TYPE_RELEASE_CONFIRM      9
 596 #define MESSAGE_TYPE_RELEASE_INDICATION  10
 597
 598
 599 static const value_string message_class_type_values[] = {
 600   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_ERR,                  "Error" },
 601   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_NTFY,                 "Notify" },
 602   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_REQ,         "DLC status request" },
 603   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_CON,         "DLC status confirm" },
 604   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_IND,         "DLC status indication" },
 605   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP,                   "ASP up" },
 606   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN,                 "ASP down" },
 607   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT,                 "Heartbeat" },
 608   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP_ACK,               "ASP up ack" },
 609   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN_ACK,             "ASP down ack" },
 610   { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT_ACK,             "Heartbeat ack" },
 611   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE ,              "ASP active" },
 612   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE ,            "ASP inactive" },
 613   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE_ACK ,          "ASP active ack" },
 614   { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE_ACK ,        "ASP inactive ack" },
 615   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_REQUEST,         "Data request" },
 616   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_INDICATION,      "Data indication" },
 617   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_REQUEST,    "Establish request" },
 618   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_CONFIRM,    "Establish confirmation" },
 619   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_INDICATION, "Establish indication" },
 620   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_REQUEST,      "Release request" },
 621   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_CONFIRM,      "Release confirmation" },
 622   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_INDICATION,   "Release indication" },
 623   { 0,                                                                     NULL } };
 624
 625 static const value_string message_class_type_acro_values[] = {
 626   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_ERR,                  "ERR" },
 627   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_NTFY,                 "NTFY" },
 628   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_REQ,         "DLC_STAT_REQ" },
 629   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_CON,         "DLC_STAT_CON" },
 630   { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_IND,         "DLC_STAT_IND" },
 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,                 "BEAT" },
 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,             "BEAT_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_REQ" },
 642   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_INDICATION,      "DATA_IND" },
 643   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_REQUEST,    "EST_REQ" },
 644   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_CONFIRM,    "EST_CON" },
 645   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_INDICATION, "EST_IND" },
 646   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_REQUEST,      "REL_REQ" },
 647   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_CONFIRM,      "REL_CON" },
 648   { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_INDICATION,   "REL_IND" },
 649   { 0,                                                                     NULL } };
 650
 651 static void
 652 dissect_common_header(tvbuff_t *common_header_tvb, packet_info *pinfo, proto_tree *dua_tree)
 653 {
 654   guint8 message_class, message_type;
 655
 656   message_class  = tvb_get_guint8(common_header_tvb, MESSAGE_CLASS_OFFSET);
 657   message_type   = tvb_get_guint8(common_header_tvb, MESSAGE_TYPE_OFFSET);
 658
 659   if (check_col(pinfo->cinfo, COL_INFO))
 660     col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str(message_class * 256 + message_type, message_class_type_acro_values, "UNKNOWN"));
 661
 662   if (dua_tree) {
 663     /* add the components of the common header to the protocol tree */
 664     proto_tree_add_item(dua_tree, hf_version, common_header_tvb, VERSION_OFFSET, VERSION_LENGTH, ENC_BIG_ENDIAN);
 665     proto_tree_add_item(dua_tree, hf_reserved, common_header_tvb, RESERVED_OFFSET, RESERVED_LENGTH, ENC_BIG_ENDIAN);
 666     proto_tree_add_item(dua_tree, hf_message_class, common_header_tvb, MESSAGE_CLASS_OFFSET, MESSAGE_CLASS_LENGTH, ENC_BIG_ENDIAN);
 667     proto_tree_add_uint_format(dua_tree, hf_message_type,
 668                                common_header_tvb, MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH,
 669                                message_type, "Message type: %u (%s)",
 670                                message_type, val_to_str(message_class * 256 + message_type, message_class_type_values, "reserved"));
 671     proto_tree_add_item(dua_tree, hf_message_length, common_header_tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH, ENC_BIG_ENDIAN);
 672   }
 673 }
 674
 675 static void
 676 dissect_dua_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *dua_tree)
 677 {
 678   tvbuff_t *common_header_tvb, *parameters_tvb;
 679
 680   common_header_tvb = tvb_new_subset(message_tvb, COMMON_HEADER_OFFSET, COMMON_HEADER_LENGTH, COMMON_HEADER_LENGTH);
 681   parameters_tvb    = tvb_new_subset_remaining(message_tvb, PARAMETERS_OFFSET);
 682   dissect_common_header(common_header_tvb, pinfo, dua_tree);
 683   dissect_parameters(parameters_tvb, pinfo, tree, dua_tree);
 684 }
 685
 686 static void
 687 dissect_dua(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree)
 688 {
 689   proto_item *dua_item;
 690   proto_tree *dua_tree;
 691
 692   /* make entry in the Protocol column on summary display */
 693   col_set_str(pinfo->cinfo, COL_PROTOCOL, "DUA");
 694
 695   /* In the interest of speed, if "tree" is NULL, don't do any work not
 696      necessary to generate protocol tree items. */
 697   if (tree) {
 698     /* create the m3ua protocol tree */
 699     dua_item = proto_tree_add_item(tree, proto_dua, message_tvb, 0, -1, ENC_NA);
 700     dua_tree = proto_item_add_subtree(dua_item, ett_dua);
 701   } else {
 702     dua_tree = NULL;
 703   };
 704   /* dissect the message */
 705   dissect_dua_message(message_tvb, pinfo, tree, dua_tree);
 706 }
 707
 708 /* Register the protocol with Wireshark */
 709 void
 710 proto_register_dua(void)
 711 {
 712
 713   /* Setup list of header fields */
 714   static hf_register_info hf[] = {
 715     { &hf_int_interface_id,      { "Integer interface identifier", "dua.int_interface_identifier",  FT_UINT32,   BASE_HEX,  NULL,                           0x0,               NULL, HFILL } },
 716     { &hf_text_interface_id,     { "Text interface identifier",    "dua.text_interface_identifier", FT_STRING,  BASE_NONE, NULL,                           0x0,               NULL, HFILL } },
 717     { &hf_info_string,           { "Info string",                  "dua.info_string",               FT_STRING,  BASE_NONE, NULL,                           0x0,               NULL, HFILL } },
 718     { &hf_dlci_reserved,         { "Reserved",                     "dua.dlci_reserved",             FT_UINT16,  BASE_DEC,  NULL,                           RESERVED_BIT_MASK, NULL, HFILL } },
 719     { &hf_dlci_v_bit,            { "V-bit",                        "dua.dlci_v_bit",                FT_BOOLEAN, 16,        NULL,                           V_BIT_MASK,        NULL, HFILL } },
 720     { &hf_dlci_zero_bit,         { "Zero bit",                     "dua.dlci_zero_bit",             FT_BOOLEAN, 16,        NULL,                           ZERO_BIT_MASK,     NULL, HFILL } },
 721     { &hf_dlci_channel,          { "Channel",                      "dua.dlci_channel",              FT_UINT16,   BASE_DEC, NULL,                           CHANNEL_BIT_MASK,  NULL, HFILL } },
 722     { &hf_dlci_one_bit,          { "One bit",                      "dua.dlci_one_bit",              FT_BOOLEAN, 16,        NULL,                           ONE_BIT_MASK,      NULL, HFILL } },
 723     { &hf_dlci_spare,            { "Spare",                        "dua.dlci_spare",                FT_UINT16,  BASE_DEC,  NULL,                           0x0,               NULL, HFILL } },
 724     { &hf_diag_info,             { "Diagnostic information",       "dua.diagnostic_information",    FT_BYTES,   BASE_NONE, NULL,                           0x0,               NULL, HFILL } },
 725     { &hf_interface_range_start, { "Start",                        "dua.interface_range_start",     FT_UINT32,  BASE_DEC,  NULL,                           0x0,               NULL, HFILL } },
 726     { &hf_interface_range_end,   { "End",                          "dua.interface_range_end",       FT_UINT32,  BASE_DEC,  NULL,                           0x0,               NULL, HFILL } },
 727     { &hf_heartbeat_data,        { "Heartbeat data",               "dua.heartbeat_data",            FT_BYTES,   BASE_NONE, NULL,                           0x0,               NULL, HFILL } },
 728     { &hf_traffic_mode_type,     { "Traffic mode type",            "dua.traffic_mode_type",         FT_UINT32,  BASE_HEX,  VALS(traffic_mode_type_values), 0x0,               NULL, HFILL } },
 729     { &hf_error_code,            { "Error code",                   "dua.error_code",                FT_UINT32,  BASE_DEC,  VALS(error_code_values),        0x0,               NULL, HFILL } },
 730     { &hf_status_type,           { "Status type",                  "dua.status_type",               FT_UINT16,  BASE_DEC,  VALS(status_type_values),       0x0,               NULL, HFILL } },
 731     { &hf_status_id,             { "Status identification",        "dua.status_identification",     FT_UINT16,  BASE_DEC,  NULL,                           0x0,               NULL, HFILL } },
 732     { &hf_release_reason,        { "Reason",                       "dua.release_reason",            FT_UINT32,  BASE_HEX,  VALS(release_reason_values),    0x0,               NULL, HFILL } },
 733     { &hf_tei_status,            { "TEI status",                   "dua.tei_status",                FT_UINT32,  BASE_HEX,  VALS(tei_status_values),        0x0,               NULL, HFILL } },
 734     { &hf_asp_id,                { "ASP identifier",               "dua.asp_identifier",            FT_UINT32,  BASE_HEX,  NULL,                           0x0,               NULL, HFILL } },
 735     { &hf_states,                { "States",                       "dua.states",                    FT_BYTES,   BASE_NONE, NULL,                           0x0,               NULL, HFILL } },
 736     { &hf_parameter_tag,         { "Parameter Tag",                "dua.parameter_tag",             FT_UINT16,  BASE_DEC,  VALS(parameter_tag_values),     0x0,               NULL, HFILL } },
 737     { &hf_parameter_length,      { "Parameter length",             "dua.parameter_length",          FT_UINT16,  BASE_DEC,  NULL,                           0x0,               NULL, HFILL } },
 738     { &hf_parameter_value,       { "Parameter value",              "dua.parameter_value",           FT_BYTES,   BASE_NONE, NULL,                           0x0,               NULL, HFILL } },
 739     { &hf_parameter_padding,     { "Parameter padding",            "dua.parameter_padding",         FT_BYTES,   BASE_NONE, NULL,                           0x0,               NULL, HFILL } },
 740     { &hf_version,               { "Version",                      "dua.version",                   FT_UINT8,   BASE_DEC,  VALS(protocol_version_values),  0x0,               NULL, HFILL } },
 741     { &hf_reserved,              { "Reserved",                     "dua.reserved",                  FT_UINT8,   BASE_HEX,  NULL,                           0x0,               NULL, HFILL } },
 742     { &hf_message_class,         { "Message class",                "dua.message_class",             FT_UINT8,   BASE_DEC,  VALS(message_class_values),     0x0,               NULL, HFILL } },
 743     { &hf_message_type,          { "Message Type",                 "dua.message_type",              FT_UINT8,   BASE_DEC,  NULL,                           0x0,               NULL, HFILL } },
 744     { &hf_message_length,        { "Message length",               "dua.message_length",            FT_UINT32,  BASE_DEC,  NULL,                           0x0,               NULL, HFILL } },
 745    };
 746   /* Setup protocol subtree array */
 747   static gint *ett[] = {
 748     &ett_dua,
 749     &ett_dua_parameter,
 750   };
 751
 752   /* Register the protocol name and description */
 753   proto_dua = proto_register_protocol("DPNSS/DASS2-User Adaptation Layer", "DUA", "dua");
 754
 755   /* Required function calls to register the header fields and subtrees used */
 756   proto_register_field_array(proto_dua, hf, array_length(hf));
 757   proto_register_subtree_array(ett, array_length(ett));
 758
 759   /* Allow other dissectors to find this one by name. */
 760   register_dissector("dua", dissect_dua, proto_dua);
 761 }
 762
 763 void
 764 proto_reg_handoff_dua(void)
 765 {
 766   dissector_handle_t dua_handle;
 767
 768   dua_handle  = find_dissector("dua");
 769   data_handle = find_dissector("data");
 770   dpnss_handle = find_dissector("dpnss");
 771   dissector_add_uint("sctp.ppi", DUA_PAYLOAD_PROTOCOL_ID, dua_handle);
 772 }