/* packet-dua.c

 * Routines for DPNSS/DASS2-User Adaptation Layer dissection

 *

 * It is hopefully (needs testing) compliant to

 *   https://tools.ietf.org/html/draft-ietf-sigtran-dua-08

 *   https://tools.ietf.org/html/draft-ietf-sigtran-rfc3057bis-02

 *

 * To do: - provide better handling of length parameters

 *

 * Copyright 2005, Michael Tuexen <tuexen [AT] fh-muenster.de>

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * Copied from packet-iua.c

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

#include "config.h"

#include <epan/packet.h>

#include <epan/sctpppids.h>

#include <wsutil/str_util.h>

#include <wsutil/ws_roundup.h>

void proto_register_dua(void);

void proto_reg_handoff_dua(void);

/* Initialize the protocol and registered fields */

static int proto_dua;

static int hf_int_interface_id;

static int hf_text_interface_id;

static int hf_info_string;

static int hf_dlci_reserved;

static int hf_dlci_v_bit;

static int hf_dlci_zero_bit;

static int hf_dlci_channel;

static int hf_dlci_one_bit;

static int hf_dlci_spare;

static int hf_diag_info;

static int hf_interface_range_start;

static int hf_interface_range_end;

static int hf_heartbeat_data;

static int hf_traffic_mode_type;

static int hf_error_code;

static int hf_status_type;

static int hf_status_id;

static int hf_release_reason;

static int hf_tei_status;

static int hf_asp_id;

static int hf_states;

static int hf_parameter_tag;

static int hf_parameter_length;

static int hf_parameter_value;

static int hf_parameter_padding;

static int hf_version;

static int hf_reserved;

static int hf_message_class;

static int hf_message_type;

static int hf_message_length;

/* Initialize the subtree pointers */

static int ett_dua;

static int ett_dua_parameter;

static dissector_handle_t dpnss_handle;

static dissector_handle_t dua_handle;

#define PARAMETER_TAG_LENGTH    2

#define PARAMETER_LENGTH_LENGTH 2

#define PARAMETER_HEADER_LENGTH (PARAMETER_TAG_LENGTH + PARAMETER_LENGTH_LENGTH)

#define PARAMETER_TAG_OFFSET    0

#define PARAMETER_LENGTH_OFFSET (PARAMETER_TAG_OFFSET + PARAMETER_TAG_LENGTH)

#define PARAMETER_VALUE_OFFSET  (PARAMETER_LENGTH_OFFSET + PARAMETER_LENGTH_LENGTH)

#define PARAMETER_HEADER_OFFSET PARAMETER_TAG_OFFSET

#define INT_INTERFACE_ID_OFFSET PARAMETER_VALUE_OFFSET

#define INT_INTERFACE_ID_LENGTH 4

static void

dissect_int_interface_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  proto_tree_add_item(parameter_tree, hf_int_interface_id,

                      parameter_tvb, INT_INTERFACE_ID_OFFSET, INT_INTERFACE_ID_LENGTH, ENC_BIG_ENDIAN);

  proto_item_append_text(parameter_item, " (%d)", tvb_get_ntohl(parameter_tvb, INT_INTERFACE_ID_OFFSET));

}

#define TEXT_INTERFACE_ID_OFFSET PARAMETER_VALUE_OFFSET

static void

dissect_text_interface_identifier_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree, proto_item *parameter_item)

{

  uint16_t interface_id_length;

  interface_id_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;

  proto_tree_add_item(parameter_tree, hf_text_interface_id,

                      parameter_tvb, TEXT_INTERFACE_ID_OFFSET, interface_id_length, ENC_ASCII);

  proto_item_append_text(parameter_item, " (%s)",

                         tvb_format_text(pinfo->pool, parameter_tvb, TEXT_INTERFACE_ID_OFFSET, interface_id_length));

}

#define INFO_STRING_OFFSET PARAMETER_VALUE_OFFSET

static void

dissect_info_string_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree, proto_item *parameter_item)

{

  uint16_t info_string_length;

  info_string_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;

  proto_tree_add_item(parameter_tree, hf_info_string,

                      parameter_tvb, INFO_STRING_OFFSET, info_string_length, ENC_ASCII);

  proto_item_append_text(parameter_item, " (%s)",

                         tvb_format_text(pinfo->pool, parameter_tvb, INFO_STRING_OFFSET, info_string_length));

}

#define DLCI_LENGTH  2

#define SPARE_LENGTH 2

#define DLCI_OFFSET  PARAMETER_VALUE_OFFSET

#define SPARE_OFFSET (DLCI_OFFSET + DLCI_LENGTH)

#define RESERVED_BIT_MASK 0xfe00

#define V_BIT_MASK        0x0100

#define ZERO_BIT_MASK     0x0080

#define CHANNEL_BIT_MASK  0x007e

#define ONE_BIT_MASK      0x0001

static void

dissect_dlci_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)

{

  proto_tree_add_item(parameter_tree, hf_dlci_reserved, parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);

  proto_tree_add_item(parameter_tree, hf_dlci_v_bit,    parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);

  proto_tree_add_item(parameter_tree, hf_dlci_zero_bit, parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);

  proto_tree_add_item(parameter_tree, hf_dlci_channel,  parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);

  proto_tree_add_item(parameter_tree, hf_dlci_one_bit,  parameter_tvb, DLCI_OFFSET,  DLCI_LENGTH,  ENC_BIG_ENDIAN);

  proto_tree_add_item(parameter_tree, hf_dlci_spare,    parameter_tvb, SPARE_OFFSET, SPARE_LENGTH, ENC_BIG_ENDIAN);

}

static void

dissect_diagnostic_information_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  uint16_t diag_info_length;

  diag_info_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;

  proto_tree_add_item(parameter_tree, hf_diag_info, parameter_tvb, PARAMETER_VALUE_OFFSET, diag_info_length, ENC_NA);

  proto_item_append_text(parameter_item, " (%u byte%s)", diag_info_length, plurality(diag_info_length, "", "s"));

}

#define START_LENGTH 4

#define END_LENGTH   4

#define INTERVAL_LENGTH (START_LENGTH + END_LENGTH)

#define START_OFFSET 0

#define END_OFFSET   (START_OFFSET + START_LENGTH)

static void

dissect_integer_range_interface_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  uint16_t number_of_ranges, range_number;

  int offset;

  number_of_ranges = (tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH) / INTERVAL_LENGTH;

  offset = PARAMETER_VALUE_OFFSET;

  for(range_number = 0; range_number < number_of_ranges; range_number++) {

    proto_tree_add_item(parameter_tree, hf_interface_range_start,

                        parameter_tvb, offset + START_OFFSET, START_LENGTH, ENC_BIG_ENDIAN);

    proto_tree_add_item(parameter_tree, hf_interface_range_end,

                        parameter_tvb, offset + END_OFFSET,   END_LENGTH,   ENC_BIG_ENDIAN);

    offset += INTERVAL_LENGTH;

  };

  proto_item_append_text(parameter_item, " (%u range%s)", number_of_ranges, plurality(number_of_ranges, "", "s"));

}

#define HEARTBEAT_DATA_OFFSET PARAMETER_VALUE_OFFSET

static void

dissect_heartbeat_data_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  uint16_t heartbeat_data_length;

  heartbeat_data_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;

  proto_tree_add_item(parameter_tree, hf_heartbeat_data,

                      parameter_tvb, HEARTBEAT_DATA_OFFSET, heartbeat_data_length, ENC_NA);

  proto_item_append_text(parameter_item, " (%u byte%s)", heartbeat_data_length, plurality(heartbeat_data_length, "", "s"));

}

#define OVER_RIDE_TRAFFIC_MODE_TYPE  1

#define LOAD_SHARE_TRAFFIC_MODE_TYPE 2

static const value_string traffic_mode_type_values[] = {

  { OVER_RIDE_TRAFFIC_MODE_TYPE,      "Over-ride" },

  { LOAD_SHARE_TRAFFIC_MODE_TYPE,     "Load-share" },

  { 0,                    NULL } };

#define TRAFFIC_MODE_TYPE_LENGTH 4

#define TRAFFIC_MODE_TYPE_OFFSET PARAMETER_VALUE_OFFSET

static void

dissect_traffic_mode_type_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  proto_tree_add_item(parameter_tree, hf_traffic_mode_type,

                      parameter_tvb, TRAFFIC_MODE_TYPE_OFFSET, TRAFFIC_MODE_TYPE_LENGTH, ENC_BIG_ENDIAN);

  proto_item_append_text(parameter_item, " (%s)",

                         val_to_str_const(tvb_get_ntohl(parameter_tvb, TRAFFIC_MODE_TYPE_OFFSET),

                                          traffic_mode_type_values, "unknown"));

}

#define INVALID_VERSION_ERROR                         0x01

#define INVALID_INTERFACE_IDENTIFIER_ERROR            0x02

#define UNSUPPORTED_MESSAGE_CLASS_ERROR               0x03

#define UNSUPPORTED_MESSAGE_TYPE_ERROR                0x04

#define UNSUPPORTED_TRAFFIC_HANDLING_MODE_ERROR       0x05

#define UNEXPECTED_MESSAGE_ERROR                      0x06

#define PROTOCOL_ERROR                                0x07

#define UNSUPPORTED_INTERFACE_IDENTIFIER_TYPE_ERROR   0x08

#define INVALID_STREAM_IDENTIFIER_ERROR               0x09

#define REFUSED_MANAGEMENT_BLOCKING_ERROR             0x0d

#define ASP_IDENTIFIER_REQUIRED_ERROR                 0x0e

#define INVALID_ASP_IDENTIFIER_ERROR                  0x0f

#define CHANNEL_NUMBER_OUT_OF_RANGE_ERROR             0x1c

#define CHANNEL_NUMBER_NOT_CONFIGURED                 0x1d

static const value_string error_code_values[] = {

  { INVALID_VERSION_ERROR,                       "Invalid version" },

  { INVALID_INTERFACE_IDENTIFIER_ERROR,          "Invalid interface identifier" },

  { UNSUPPORTED_MESSAGE_CLASS_ERROR,             "Unsupported message class" },

  { UNSUPPORTED_MESSAGE_TYPE_ERROR,              "Unsupported message type" },

  { UNSUPPORTED_TRAFFIC_HANDLING_MODE_ERROR,     "Unsupported traffic handling mode" },

  { UNEXPECTED_MESSAGE_ERROR,                    "Unexpected message" },

  { PROTOCOL_ERROR,                              "Protocol error" },

  { UNSUPPORTED_INTERFACE_IDENTIFIER_TYPE_ERROR, "Unsupported interface identifier type" },

  { INVALID_STREAM_IDENTIFIER_ERROR,             "Invalid stream identifier" },

  { REFUSED_MANAGEMENT_BLOCKING_ERROR,           "Refused - Management blocking" },

  { ASP_IDENTIFIER_REQUIRED_ERROR,               "ASP identifier required" },

  { INVALID_ASP_IDENTIFIER_ERROR,                "Invalid ASP Identifier" },

  { CHANNEL_NUMBER_OUT_OF_RANGE_ERROR,           "Channel number out of range" },

  { CHANNEL_NUMBER_NOT_CONFIGURED,               "Channel number not configured" },

  { 0,                                           NULL } };

#define ERROR_CODE_LENGTH 4

#define ERROR_CODE_OFFSET PARAMETER_VALUE_OFFSET

static void

dissect_error_code_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  proto_tree_add_item(parameter_tree, hf_error_code,

                      parameter_tvb, ERROR_CODE_OFFSET, ERROR_CODE_LENGTH, ENC_BIG_ENDIAN);

  proto_item_append_text(parameter_item, " (%s)",

                         val_to_str_const(tvb_get_ntohl(parameter_tvb, ERROR_CODE_OFFSET),

                                          error_code_values,

                                          "unknown"));

}

#define ASP_STATE_CHANGE_STATUS_TYPE  0x01

#define OTHER_STATUS_TYPE             0x02

static const value_string status_type_values[] = {

  { ASP_STATE_CHANGE_STATUS_TYPE,        "Application server state change" },

  { OTHER_STATUS_TYPE,                   "Other" },

  { 0,                                   NULL } };

#define AS_DOWN_STATUS_IDENT          0x01

#define AS_INACTIVE_STATUS_IDENT      0x02

#define AS_ACTIVE_STATUS_IDENT        0x03

#define AS_PENDING_STATUS_IDENT       0x04

#define INSUFFICIENT_ASP_RESOURCES_STATUS_IDENT 0x01

#define ALTERNATE_ASP_ACTIVE_STATUS_IDENT       0x02

static const value_string status_type_id_values[] = {

  { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_DOWN_STATUS_IDENT,         "Application server down" },

  { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_INACTIVE_STATUS_IDENT,     "Application server inactive" },

  { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_ACTIVE_STATUS_IDENT,       "Application server active" },

  { ASP_STATE_CHANGE_STATUS_TYPE * 256 * 256 + AS_PENDING_STATUS_IDENT,      "Application server pending" },

  { OTHER_STATUS_TYPE * 256 * 256 + INSUFFICIENT_ASP_RESOURCES_STATUS_IDENT, "Insufficient ASP resources active in AS" },

  { OTHER_STATUS_TYPE * 256 * 256 + ALTERNATE_ASP_ACTIVE_STATUS_IDENT,       "Alternate ASP active" },

  { 0,                                           NULL } };

#define STATUS_TYPE_LENGTH  2

#define STATUS_IDENT_LENGTH 2

#define STATUS_TYPE_OFFSET  PARAMETER_VALUE_OFFSET

#define STATUS_IDENT_OFFSET (STATUS_TYPE_OFFSET + STATUS_TYPE_LENGTH)

static void

dissect_status_type_identification_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  uint16_t status_type, status_id;

  status_type = tvb_get_ntohs(parameter_tvb, STATUS_TYPE_OFFSET);

  status_id   = tvb_get_ntohs(parameter_tvb, STATUS_IDENT_OFFSET);

  proto_tree_add_item(parameter_tree, hf_status_type,

                      parameter_tvb, STATUS_TYPE_OFFSET, STATUS_TYPE_LENGTH, ENC_BIG_ENDIAN);

  proto_tree_add_uint_format_value(parameter_tree, hf_status_id,  parameter_tvb, STATUS_IDENT_OFFSET, STATUS_IDENT_LENGTH,

                             status_id, "%u (%s)", status_id,

                             val_to_str_const(status_type * 256 * 256 + status_id, status_type_id_values, "unknown"));

  proto_item_append_text(parameter_item, " (%s)",

                         val_to_str_const(status_type * 256 * 256 + status_id,

                                          status_type_id_values,

                                          "unknown status information"));

}

#define PROTOCOL_DATA_OFFSET PARAMETER_VALUE_OFFSET

static void

dissect_protocol_data_parameter(tvbuff_t *parameter_tvb, proto_item *parameter_item, packet_info *pinfo, proto_tree *tree)

{

  uint16_t protocol_data_length;

  tvbuff_t *protocol_data_tvb;

  protocol_data_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;

  protocol_data_tvb    = tvb_new_subset_length(parameter_tvb, PROTOCOL_DATA_OFFSET, protocol_data_length);

  if(dpnss_handle){

    call_dissector(dpnss_handle, protocol_data_tvb, pinfo, tree);

    return;

  }

  call_data_dissector(protocol_data_tvb, pinfo, tree);

  proto_item_append_text(parameter_item, " (%u byte%s)", protocol_data_length, plurality(protocol_data_length, "", "s"));

}

#define RELEASE_MGMT_REASON   0

#define RELEASE_PHYS_REASON   1

#define RELEASE_DM_REASON     2

#define RELEASE_OTHER_REASON  3

static const value_string release_reason_values[] = {

  { RELEASE_MGMT_REASON,  "Management layer generated release" },

  { RELEASE_PHYS_REASON,  "Physical layer alarm generated release" },

  { RELEASE_DM_REASON,    "Layer 2 should release" },

  { RELEASE_OTHER_REASON, "Other reason" },

  { 0,                    NULL } };

#define RELEASE_REASON_OFFSET PARAMETER_VALUE_OFFSET

#define RELEASE_REASON_LENGTH 4

static void

dissect_release_reason_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  proto_tree_add_item(parameter_tree, hf_release_reason,

                      parameter_tvb, RELEASE_REASON_OFFSET, RELEASE_REASON_LENGTH, ENC_BIG_ENDIAN);

  proto_item_append_text(parameter_item, " (%s)",

                         val_to_str_const(tvb_get_ntohl(parameter_tvb, RELEASE_REASON_OFFSET),

                                          release_reason_values,

                                          "unknown"));

}

#define TEI_STATUS_ASSIGNED       0

#define TEI_STATUS_UNASSIGNED     1

static const value_string tei_status_values[] = {

  { TEI_STATUS_ASSIGNED,   "TEI is considered assigned by Q.921" },

  { TEI_STATUS_UNASSIGNED, "TEI is considered unassigned by Q.921" },

  { 0,                    NULL } };

#define TEI_STATUS_LENGTH 4

#define TEI_STATUS_OFFSET PARAMETER_VALUE_OFFSET

static void

dissect_tei_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  proto_tree_add_item(parameter_tree, hf_tei_status,

                      parameter_tvb, TEI_STATUS_OFFSET, TEI_STATUS_LENGTH, ENC_BIG_ENDIAN);

  proto_item_append_text(parameter_item, " (%s)",

                      val_to_str_const(tvb_get_ntohl(parameter_tvb, TEI_STATUS_OFFSET),

                                       tei_status_values,

                                       "unknown"));

}

#define ASP_ID_LENGTH 4

#define ASP_ID_OFFSET PARAMETER_VALUE_OFFSET

static void

dissect_asp_identifier_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  proto_tree_add_item(parameter_tree, hf_asp_id, parameter_tvb, ASP_ID_OFFSET, ASP_ID_LENGTH, ENC_BIG_ENDIAN);

  proto_item_append_text(parameter_item, " (%u)", tvb_get_ntohl(parameter_tvb, ASP_ID_OFFSET));

}

static void

dissect_dlc_status_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item _U_)

{

  uint16_t parameter_value_length;

  /* FIXME: This can be done better */

  parameter_value_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;

  if (parameter_value_length > 0)

    proto_tree_add_item(parameter_tree,

                        hf_states, parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, ENC_NA);

}

static void

dissect_unknown_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)

{

  uint16_t parameter_value_length;

  parameter_value_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;

  if (parameter_value_length > 0)

    proto_tree_add_item(parameter_tree, hf_parameter_value,

                        parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, ENC_NA);

  proto_item_append_text(parameter_item, " with tag %u and %u byte%s value",

                         tvb_get_ntohs(parameter_tvb, PARAMETER_TAG_OFFSET),

                         parameter_value_length, plurality(parameter_value_length, "", "s"));

}

#define INT_INTERFACE_IDENTIFIER_PARAMETER_TAG           0x01

#define TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG          0x03

#define INFO_PARAMETER_TAG                               0x04

#define DLCI_PARAMETER_TAG                               0x05

#define DIAGNOSTIC_INFORMATION_PARAMETER_TAG             0x07

#define INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG 0x08

#define HEARTBEAT_DATA_PARAMETER_TAG                     0x09

#define TRAFFIC_MODE_TYPE_PARAMETER_TAG                  0x0b

#define ERROR_CODE_PARAMETER_TAG                         0x0c

#define STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG        0x0d

#define PROTOCOL_DATA_PARAMETER_TAG                      0x0e

#define RELEASE_REASON_PARAMETER_TAG                     0x0f

#define TEI_STATUS_PARAMETER_TAG                         0x10

#define ASP_IDENTIFIER_PARAMETER_TAG                     0x11

#define DLC_STATUS_PARAMETER_TAG                         0x12

static const value_string parameter_tag_values[] = {

  { INT_INTERFACE_IDENTIFIER_PARAMETER_TAG,                "Integer interface identifier" },

  { TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG,               "Text interface identifier" },

  { INFO_PARAMETER_TAG,                                    "Info" },

  { DLCI_PARAMETER_TAG,                                    "DLCI" },

  { DIAGNOSTIC_INFORMATION_PARAMETER_TAG,                  "Diagnostic information" },

  { INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG,      "Integer range interface identifier" },

  { HEARTBEAT_DATA_PARAMETER_TAG,                          "Heartbeat data" },

  { TRAFFIC_MODE_TYPE_PARAMETER_TAG,                       "Traffic mode type" },

  { ERROR_CODE_PARAMETER_TAG,                              "Error code" },

  { STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG,             "Status type/identification" },

  { PROTOCOL_DATA_PARAMETER_TAG,                           "Protocol data" },

  { RELEASE_REASON_PARAMETER_TAG,                          "Reason" },

  { TEI_STATUS_PARAMETER_TAG,                              "TEI status" },

  { ASP_IDENTIFIER_PARAMETER_TAG,                          "ASP identifier"},

  { DLC_STATUS_PARAMETER_TAG,                              "DLC status" },

  { 0,                                                     NULL } };

static void

dissect_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *dua_tree)

{

  uint16_t tag, length, padding_length;

  proto_item *parameter_item;

  proto_tree *parameter_tree;

  /* extract tag and length from the parameter */

  tag            = tvb_get_ntohs(parameter_tvb, PARAMETER_TAG_OFFSET);

  length         = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);

  padding_length = tvb_reported_length(parameter_tvb) - length;

  /* create proto_tree stuff */

  parameter_tree   = proto_tree_add_subtree(dua_tree, parameter_tvb, PARAMETER_HEADER_OFFSET,

                                         -1, ett_dua_parameter, &parameter_item,

                                         val_to_str_const(tag, parameter_tag_values, "Unknown parameter"));

  /* add tag and length to the dua tree */

  proto_tree_add_item(parameter_tree, hf_parameter_tag,

                      parameter_tvb, PARAMETER_TAG_OFFSET, PARAMETER_TAG_LENGTH, ENC_BIG_ENDIAN);

  proto_tree_add_item(parameter_tree, hf_parameter_length,

                      parameter_tvb, PARAMETER_LENGTH_OFFSET, PARAMETER_LENGTH_LENGTH, ENC_BIG_ENDIAN);

  switch(tag) {

  case INT_INTERFACE_IDENTIFIER_PARAMETER_TAG:

    dissect_int_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  case TEXT_INTERFACE_IDENTIFIER_PARAMETER_TAG:

    dissect_text_interface_identifier_parameter(parameter_tvb, pinfo, parameter_tree, parameter_item);

    break;

  case INFO_PARAMETER_TAG:

    dissect_info_string_parameter(parameter_tvb, pinfo, parameter_tree, parameter_item);

    break;

  case DLCI_PARAMETER_TAG:

    dissect_dlci_parameter(parameter_tvb, parameter_tree);

    break;

  case DIAGNOSTIC_INFORMATION_PARAMETER_TAG:

    dissect_diagnostic_information_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  case INTEGER_RANGE_INTERFACE_IDENTIFIER_PARAMETER_TAG:

    dissect_integer_range_interface_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  case HEARTBEAT_DATA_PARAMETER_TAG:

    dissect_heartbeat_data_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  case TRAFFIC_MODE_TYPE_PARAMETER_TAG:

    dissect_traffic_mode_type_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  case ERROR_CODE_PARAMETER_TAG:

    dissect_error_code_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  case STATUS_TYPE_INDENTIFICATION_PARAMETER_TAG:

    dissect_status_type_identification_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  case PROTOCOL_DATA_PARAMETER_TAG:

    dissect_protocol_data_parameter(parameter_tvb, parameter_item, pinfo, tree);

    break;

  case RELEASE_REASON_PARAMETER_TAG:

    dissect_release_reason_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  case TEI_STATUS_PARAMETER_TAG:

    dissect_tei_status_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  case ASP_IDENTIFIER_PARAMETER_TAG:

    dissect_asp_identifier_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  case DLC_STATUS_PARAMETER_TAG:

    dissect_dlc_status_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  default:

    dissect_unknown_parameter(parameter_tvb, parameter_tree, parameter_item);

    break;

  };

  if (padding_length > 0)

    proto_tree_add_item(parameter_tree, hf_parameter_padding,

                        parameter_tvb, PARAMETER_HEADER_OFFSET + length, padding_length, ENC_NA);

}

static void

dissect_parameters(tvbuff_t *parameters_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *dua_tree)

{

  int offset, length, total_length, remaining_length;

  tvbuff_t *parameter_tvb;

  offset = 0;

  while((remaining_length = tvb_reported_length_remaining(parameters_tvb, offset))) {

    length       = tvb_get_ntohs(parameters_tvb, offset + PARAMETER_LENGTH_OFFSET);

    total_length = WS_ROUNDUP_4(length);

    if (remaining_length >= length)

      total_length = MIN(total_length, remaining_length);

    /* create a tvb for the parameter including the padding bytes */

    parameter_tvb  = tvb_new_subset_length(parameters_tvb, offset, total_length);

    dissect_parameter(parameter_tvb, pinfo, tree, dua_tree);

    /* get rid of the handled parameter */

    offset += total_length;

  }

}

#define VERSION_LENGTH         1

#define RESERVED_LENGTH        1

#define MESSAGE_CLASS_LENGTH   1

#define MESSAGE_TYPE_LENGTH    1

#define MESSAGE_LENGTH_LENGTH  4

#define COMMON_HEADER_LENGTH   (VERSION_LENGTH + RESERVED_LENGTH + MESSAGE_CLASS_LENGTH + \

                                MESSAGE_TYPE_LENGTH + MESSAGE_LENGTH_LENGTH)

#define COMMON_HEADER_OFFSET   0

#define VERSION_OFFSET         COMMON_HEADER_OFFSET

#define RESERVED_OFFSET        (VERSION_OFFSET + VERSION_LENGTH)

#define MESSAGE_CLASS_OFFSET   (RESERVED_OFFSET + RESERVED_LENGTH)

#define MESSAGE_TYPE_OFFSET    (MESSAGE_CLASS_OFFSET + MESSAGE_CLASS_LENGTH)

#define MESSAGE_LENGTH_OFFSET  (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)

#define PARAMETERS_OFFSET      (COMMON_HEADER_OFFSET + COMMON_HEADER_LENGTH)

#define PROTOCOL_VERSION_RELEASE_1             1

static const value_string protocol_version_values[] = {

  { PROTOCOL_VERSION_RELEASE_1,  "Release 1" },

  { 0,                           NULL } };

#define MESSAGE_CLASS_MGMT_MESSAGE        0

#define MESSAGE_CLASS_ASPSM_MESSAGE       3

#define MESSAGE_CLASS_ASPTM_MESSAGE       4

#define MESSAGE_CLASS_DPTM_MESSAGE       13

static const value_string message_class_values[] = {

  { MESSAGE_CLASS_MGMT_MESSAGE,   "Management messages" },

  { MESSAGE_CLASS_ASPSM_MESSAGE,  "ASP state maintenance messages" },

  { MESSAGE_CLASS_ASPTM_MESSAGE,  "ASP traffic maintenance messages" },

  { MESSAGE_CLASS_DPTM_MESSAGE,   "DPNSS/DASS2 boundary primitive transport messages" },

  { 0,                             NULL } };

/* message types for MGMT messages */

#define MESSAGE_TYPE_ERR                  0

#define MESSAGE_TYPE_NTFY                 1

#define MESSAGE_TYPE_DLC_STAT_REQ         5

#define MESSAGE_TYPE_DLC_STAT_CON         6

#define MESSAGE_TYPE_DLC_STAT_IND         7

/* message types for ASPSM messages */

#define MESSAGE_TYPE_UP                   1

#define MESSAGE_TYPE_DOWN                 2

#define MESSAGE_TYPE_BEAT                 3

#define MESSAGE_TYPE_UP_ACK               4

#define MESSAGE_TYPE_DOWN_ACK             5

#define MESSAGE_TYPE_BEAT_ACK             6

/* message types for ASPTM messages */

#define MESSAGE_TYPE_ACTIVE               1

#define MESSAGE_TYPE_INACTIVE             2

#define MESSAGE_TYPE_ACTIVE_ACK           3

#define MESSAGE_TYPE_INACTIVE_ACK         4

/* message types for DPTM messages */

#define MESSAGE_TYPE_DATA_REQUEST         1

#define MESSAGE_TYPE_DATA_INDICATION      2

#define MESSAGE_TYPE_ESTABLISH_REQUEST    5

#define MESSAGE_TYPE_ESTABLISH_CONFIRM    6

#define MESSAGE_TYPE_ESTABLISH_INDICATION 7

#define MESSAGE_TYPE_RELEASE_REQUEST      8

#define MESSAGE_TYPE_RELEASE_CONFIRM      9

#define MESSAGE_TYPE_RELEASE_INDICATION  10

static const value_string message_class_type_values[] = {

  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_ERR,                  "Error" },

  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_NTFY,                 "Notify" },

  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_REQ,         "DLC status request" },

  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_CON,         "DLC status confirm" },

  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_IND,         "DLC status indication" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP,                   "ASP up" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN,                 "ASP down" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT,                 "Heartbeat" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP_ACK,               "ASP up ack" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN_ACK,             "ASP down ack" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT_ACK,             "Heartbeat ack" },

  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE ,              "ASP active" },

  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE ,            "ASP inactive" },

  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE_ACK ,          "ASP active ack" },

  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE_ACK ,        "ASP inactive ack" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_REQUEST,         "Data request" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_INDICATION,      "Data indication" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_REQUEST,    "Establish request" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_CONFIRM,    "Establish confirmation" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_INDICATION, "Establish indication" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_REQUEST,      "Release request" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_CONFIRM,      "Release confirmation" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_INDICATION,   "Release indication" },

  { 0,                                                                     NULL } };

static const value_string message_class_type_acro_values[] = {

  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_ERR,                  "ERR" },

  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_NTFY,                 "NTFY" },

  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_REQ,         "DLC_STAT_REQ" },

  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_CON,         "DLC_STAT_CON" },

  { MESSAGE_CLASS_MGMT_MESSAGE  * 256 + MESSAGE_TYPE_DLC_STAT_IND,         "DLC_STAT_IND" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP,                   "ASP_UP" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN,                 "ASP_DOWN" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT,                 "BEAT" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_UP_ACK,               "ASP_UP_ACK" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_DOWN_ACK,             "ASP_DOWN_ACK" },

  { MESSAGE_CLASS_ASPSM_MESSAGE * 256 + MESSAGE_TYPE_BEAT_ACK,             "BEAT_ACK" },

  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE ,              "ASP_ACTIVE" },

  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE ,            "ASP_INACTIVE" },

  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_ACTIVE_ACK ,          "ASP_ACTIVE_ACK" },

  { MESSAGE_CLASS_ASPTM_MESSAGE * 256 + MESSAGE_TYPE_INACTIVE_ACK ,        "ASP_INACTIVE_ACK" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_REQUEST,         "DATA_REQ" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_DATA_INDICATION,      "DATA_IND" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_REQUEST,    "EST_REQ" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_CONFIRM,    "EST_CON" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_ESTABLISH_INDICATION, "EST_IND" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_REQUEST,      "REL_REQ" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_CONFIRM,      "REL_CON" },

  { MESSAGE_CLASS_DPTM_MESSAGE  * 256 + MESSAGE_TYPE_RELEASE_INDICATION,   "REL_IND" },

  { 0,                                                                     NULL } };

static void

dissect_common_header(tvbuff_t *common_header_tvb, packet_info *pinfo, proto_tree *dua_tree)

{

  uint8_t message_class, message_type;

  message_class  = tvb_get_uint8(common_header_tvb, MESSAGE_CLASS_OFFSET);

  message_type   = tvb_get_uint8(common_header_tvb, MESSAGE_TYPE_OFFSET);

  col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str_const(message_class * 256 + message_type,

                                                                 message_class_type_acro_values,

                                                                 "Unknown"));

  if (dua_tree) {

    /* add the components of the common header to the protocol tree */

    proto_tree_add_item(dua_tree, hf_version, common_header_tvb, VERSION_OFFSET, VERSION_LENGTH, ENC_BIG_ENDIAN);

    proto_tree_add_item(dua_tree, hf_reserved, common_header_tvb, RESERVED_OFFSET, RESERVED_LENGTH, ENC_BIG_ENDIAN);

    proto_tree_add_item(dua_tree, hf_message_class,

                        common_header_tvb, MESSAGE_CLASS_OFFSET, MESSAGE_CLASS_LENGTH, ENC_BIG_ENDIAN);

    proto_tree_add_uint_format_value(dua_tree, hf_message_type,

                               common_header_tvb, MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH,

                               message_type, "%u (%s)",

                               message_type, val_to_str_const(message_class * 256 + message_type,

                                                              message_class_type_values,

                                                              "reserved"));

    proto_tree_add_item(dua_tree, hf_message_length,

                        common_header_tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH, ENC_BIG_ENDIAN);

  }

}

static void

dissect_dua_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree, proto_tree *dua_tree)

{

  tvbuff_t *common_header_tvb, *parameters_tvb;

  common_header_tvb = tvb_new_subset_length(message_tvb, COMMON_HEADER_OFFSET, COMMON_HEADER_LENGTH);

  parameters_tvb    = tvb_new_subset_remaining(message_tvb, PARAMETERS_OFFSET);

  dissect_common_header(common_header_tvb, pinfo, dua_tree);

  dissect_parameters(parameters_tvb, pinfo, tree, dua_tree);

}

static int

dissect_dua(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)

{

  proto_item *dua_item;

  proto_tree *dua_tree;

  /* make entry in the Protocol column on summary display */

  col_set_str(pinfo->cinfo, COL_PROTOCOL, "DUA");

  /* create the m3ua protocol tree */

  dua_item = proto_tree_add_item(tree, proto_dua, message_tvb, 0, -1, ENC_NA);

  dua_tree = proto_item_add_subtree(dua_item, ett_dua);

  /* dissect the message */

  dissect_dua_message(message_tvb, pinfo, tree, dua_tree);

  return tvb_captured_length(message_tvb);

}

/* Register the protocol with Wireshark */

void

proto_register_dua(void)

{

  /* Setup list of header fields */

  static hf_register_info hf[] = {

    { &hf_int_interface_id,

      { "Integer interface identifier", "dua.int_interface_identifier",

        FT_UINT32,   BASE_HEX,  NULL,                          0x0,

        NULL, HFILL } },

    { &hf_text_interface_id,

      { "Text interface identifier",    "dua.text_interface_identifier",

        FT_STRING,  BASE_NONE, NULL,                           0x0,

        NULL, HFILL } },

    { &hf_info_string,

      { "Info string",                  "dua.info_string",

        FT_STRING,  BASE_NONE, NULL,                           0x0,

        NULL, HFILL } },

    { &hf_dlci_reserved,

      { "Reserved",                     "dua.dlci_reserved",

        FT_UINT16,  BASE_DEC,  NULL,                           RESERVED_BIT_MASK,

        NULL, HFILL } },

    { &hf_dlci_v_bit,

      { "V-bit",                        "dua.dlci_v_bit",

        FT_BOOLEAN, 16,        NULL,                           V_BIT_MASK,

        NULL, HFILL } },

    { &hf_dlci_zero_bit,

      { "Zero bit",                     "dua.dlci_zero_bit",

        FT_BOOLEAN, 16,        NULL,                           ZERO_BIT_MASK,

        NULL, HFILL } },

    { &hf_dlci_channel,

      { "Channel",                      "dua.dlci_channel",

        FT_UINT16,   BASE_DEC, NULL,                           CHANNEL_BIT_MASK,

        NULL, HFILL } },

    { &hf_dlci_one_bit,

      { "One bit",                      "dua.dlci_one_bit",

        FT_BOOLEAN, 16,        NULL,                           ONE_BIT_MASK,

        NULL, HFILL } },

    { &hf_dlci_spare,

      { "Spare",                        "dua.dlci_spare",

        FT_UINT16,  BASE_DEC,  NULL,                           0x0,

        NULL, HFILL } },

    { &hf_diag_info,

      { "Diagnostic information",       "dua.diagnostic_information",

        FT_BYTES,   BASE_NONE, NULL,                           0x0,

        NULL, HFILL } },

    { &hf_interface_range_start,

      { "Start",                        "dua.interface_range_start",

        FT_UINT32,  BASE_DEC,  NULL,                           0x0,

        NULL, HFILL } },

    { &hf_interface_range_end,

      { "End",                          "dua.interface_range_end",

        FT_UINT32,  BASE_DEC,  NULL,                           0x0,

        NULL, HFILL } },

    { &hf_heartbeat_data,

      { "Heartbeat data",               "dua.heartbeat_data",

        FT_BYTES,   BASE_NONE, NULL,                           0x0,

        NULL, HFILL } },

    { &hf_traffic_mode_type,

      { "Traffic mode type",            "dua.traffic_mode_type",

        FT_UINT32,  BASE_HEX,  VALS(traffic_mode_type_values), 0x0,

        NULL, HFILL } },

    { &hf_error_code,

      { "Error code",                   "dua.error_code",

        FT_UINT32,  BASE_DEC,  VALS(error_code_values),        0x0,

        NULL, HFILL } },

    { &hf_status_type,

      { "Status type",                  "dua.status_type",

        FT_UINT16,  BASE_DEC,  VALS(status_type_values),       0x0,

        NULL, HFILL } },

    { &hf_status_id,

      { "Status identification",        "dua.status_identification",

        FT_UINT16,  BASE_DEC,  NULL,                           0x0,

        NULL, HFILL } },

    { &hf_release_reason,

      { "Reason",                       "dua.release_reason",

        FT_UINT32,  BASE_HEX,  VALS(release_reason_values),    0x0,

        NULL, HFILL } },

    { &hf_tei_status,

      { "TEI status",                   "dua.tei_status",

        FT_UINT32,  BASE_HEX,  VALS(tei_status_values),        0x0,

        NULL, HFILL } },

    { &hf_asp_id,

      { "ASP identifier",               "dua.asp_identifier",

        FT_UINT32,  BASE_HEX,  NULL,                           0x0,

        NULL, HFILL } },

    { &hf_states,

      { "States",                       "dua.states",

        FT_BYTES,   BASE_NONE, NULL,                           0x0,

        NULL, HFILL } },

    { &hf_parameter_tag,

      { "Parameter Tag",                "dua.parameter_tag",

        FT_UINT16,  BASE_DEC,  VALS(parameter_tag_values),     0x0,

        NULL, HFILL } },

    { &hf_parameter_length,

      { "Parameter length",             "dua.parameter_length",

        FT_UINT16,  BASE_DEC,  NULL,                           0x0,

        NULL, HFILL } },

    { &hf_parameter_value,

      { "Parameter value",              "dua.parameter_value",

        FT_BYTES,   BASE_NONE, NULL,                           0x0,

        NULL, HFILL } },

    { &hf_parameter_padding,

      { "Parameter padding",            "dua.parameter_padding",

        FT_BYTES,   BASE_NONE, NULL,                           0x0,

        NULL, HFILL } },

    { &hf_version,

      { "Version",                      "dua.version",

        FT_UINT8,   BASE_DEC,  VALS(protocol_version_values),  0x0,

        NULL, HFILL } },

    { &hf_reserved,

      { "Reserved",                     "dua.reserved",

        FT_UINT8,   BASE_HEX,  NULL,                           0x0,

        NULL, HFILL } },

    { &hf_message_class,

      { "Message class",                "dua.message_class",

        FT_UINT8,   BASE_DEC,  VALS(message_class_values),     0x0,

        NULL, HFILL } },

    { &hf_message_type,

      { "Message Type",                 "dua.message_type",

        FT_UINT8,   BASE_DEC,  NULL,                           0x0,

        NULL, HFILL } },

    { &hf_message_length,

      { "Message length",               "dua.message_length",

        FT_UINT32,  BASE_DEC,  NULL,                           0x0,

        NULL, HFILL } },

   };

  /* Setup protocol subtree array */

  static int *ett[] = {

    &ett_dua,

    &ett_dua_parameter,

  };

  /* Register the protocol name and description */

  proto_dua = proto_register_protocol("DPNSS/DASS2-User Adaptation Layer", "DUA", "dua");

  /* Required function calls to register the header fields and subtrees used */

  proto_register_field_array(proto_dua, hf, array_length(hf));

  proto_register_subtree_array(ett, array_length(ett));

  /* Allow other dissectors to find this one by name. */

  dua_handle = register_dissector("dua", dissect_dua, proto_dua);

}

void

proto_reg_handoff_dua(void)

{

  dpnss_handle = find_dissector_add_dependency("dpnss", proto_dua);

  dissector_add_uint("sctp.ppi", DUA_PAYLOAD_PROTOCOL_ID, dua_handle);

}

/*

 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html

 *

 * Local Variables:

 * c-basic-offset: 2

 * tab-width: 8

 * indent-tabs-mode: nil

 * End:

 *

 * ex: set shiftwidth=2 tabstop=8 expandtab:

 * :indentSize=2:tabSize=8:noTabs=true:

 */