path: root/epan/dissectors/packet-s5066dts.c

/*
 * packet-s5066dts.c
 * Routines for STANAG 5066 DTS layer packet dissection
 *
 * Copyright (c) 2013
 *  by Ibrahim Can Yuce <canyuce [at] gmail [dot] com>
 *  by M. Baris Demiray <baris.demiray [at] gmail [dot] com>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/expert.h>
#include "packet-tcp.h" /* For tcp_dissect_pdus() */
#include <epan/crc16-tvb.h>
#include <epan/crc32-tvb.h>
#include <wiretap/wtap.h>

#define DISSECTOR_NAME                      "s5066dts"
/* STANAG 5066 DPDU properties */
#define S5066_DPDU_MAX_DPDU_SIZE            1070
#define S5066_DPDU_FRAME_HEADER_LEN         15
/* Header field index (in bytes) and size (in bits) constants */
#define S5066_DPDU_EOW_TYPE_INDEX           2
#define S5066_DPDU_EOW_CONTENT_INDEX        3
#define S5066_DPDU_EOT_INDEX                4
#define S5066_DPDU_SIZE_OF_ADDRESS_INDEX    5
#define S5066_DPDU_SIZE_OF_HEADER_INDEX     5
#define S5066_DPDU_SYNC_SEQUENCE_SIZE       2 /*bytes*/
/* D_PDU message types */
#define S5066_DPDU_DATA_ONLY                0
#define S5066_DPDU_ACK_ONLY                 1
#define S5066_DPDU_DATA_ACK                 2
#define S5066_DPDU_RESET_WIN_RESYNC         3
#define S5066_DPDU_EXP_DATA_ONLY            4
#define S5066_DPDU_EXP_ACK_ONLY             5
#define S5066_DPDU_MANAGEMENT               6
#define S5066_DPDU_NON_ARQ_DATA             7
#define S5066_DPDU_EXP_NON_ARQ_DATA         8
#define S5066_DPDU_WARNING                  15
/* EOW message types */
#define S5066_EOW_RESERVED                  0
#define S5066_EOW_DRC_REQUEST               1
#define S5066_EOW_DRC_RESPONSE              2
#define S5066_EOW_UNRECOGNIZED_TYPE         3
#define S5066_EOW_CAPABILITY                4
#define S5066_EOW_ALM_REQUEST               5
#define S5066_EOW_ALM_RESPONSE              6
#define S5066_EOW_HDR_DRC_REQUEST           7
#define S5066_EOW_HFTRP_TOKEN               15

void proto_register_s5066dts(void);

static int proto_s5066dts;

static dissector_handle_t s5066dts_handle;
static dissector_handle_t s5066dts_over_tcp_handle;

/* Configuration parameters */
static bool config_proto_desegment = true;

/* Initialize expert fields */
static expert_field ei_s5066dts_eow_hdr_drc_request_invalid;
static expert_field ei_s5066dts_eow_hftrp_invalid;

/* TCP port that will be listened by the application that peer
 * dts layers will be connected through
 */
static range_t *config_s5066dts_ports;

static int hf_s5066dts_sync_word;
static int hf_s5066dts_dpdu_type;
static int hf_s5066dts_eow_type;
static int hf_s5066dts_eow_data;
static int hf_s5066dts_eot;
static int hf_s5066dts_address_size;
static int hf_s5066dts_header_size;
static int hf_s5066dts_header_crc;
static int hf_s5066dts_cpdu_crc;
static int hf_s5066dts_segmented_cpdu;
static int hf_s5066dts_dest_addr;
static int hf_s5066dts_src_addr;

/* EOW TYPES */
/* { 1, "DRC_REQUEST"}, */
static int hf_s5066dts_eow_drc_request_data_rate;
static int hf_s5066dts_eow_drc_request_interleaving;
static int hf_s5066dts_eow_drc_request_others;
/* { 2, "DRC_RESPONSE"}, */
static int hf_s5066dts_eow_drc_response_response;
static int hf_s5066dts_eow_drc_response_reason;
/* { 3, "UNRECOGNIZED_TYPE"}, */
static int hf_s5066dts_eow_unrec_type_response;
static int hf_s5066dts_eow_unrec_type_reason;
/* { 4, "CAPABILITY"}, */
static int hf_s5066dts_eow_capability_adaptive;
static int hf_s5066dts_eow_capability_stanag_4529;
static int hf_s5066dts_eow_capability_mil_std_188_110a;
static int hf_s5066dts_eow_capability_extended;
static int hf_s5066dts_eow_capability_full_duplex;
static int hf_s5066dts_eow_capability_split_frequency;
static int hf_s5066dts_eow_capability_non_arcs_ale;
static int hf_s5066dts_eow_capability_arcs;
/* { 5, "ALM_REQUEST"}, */
static int hf_s5066dts_eow_alm_request_data_rate;
static int hf_s5066dts_eow_alm_request_interleaving;
static int hf_s5066dts_eow_alm_request_others;
/* { 6, "ALM_RESPONSE"}, */
static int hf_s5066dts_eow_alm_response_response;
static int hf_s5066dts_eow_alm_response_reason;
/* { 7, "HDR_DRC_REQUEST"}, */
static int hf_s5066dts_eow_hdr_drc_request_waveform;
static int hf_s5066dts_eow_hdr_drc_request_num_channels;
static int hf_s5066dts_eow_hdr_drc_request_data_rate;
static int hf_s5066dts_eow_hdr_drc_request_interleaver_length;
/* {15, "HFTRP FRAME CONTROL"}, */
static int hf_s5066dts_eow_hftrp_hftrp_token;

/* DPDU TYPES */
/* { 0, "DATA_ONLY"}, */
static int hf_s5066dts_data_only_cpdu_start;
static int hf_s5066dts_data_only_cpdu_end;
static int hf_s5066dts_data_only_deliver_in_order;
static int hf_s5066dts_data_only_drop_cpdu;
static int hf_s5066dts_data_only_tx_win_uwe;
static int hf_s5066dts_data_only_tx_win_lwe;
static int hf_s5066dts_data_only_segmented_cpdu_size;
static int hf_s5066dts_data_only_transmit_sequence_number;
/* { 1, "ACK_ONLY"}, */
static int hf_s5066dts_ack_only_rx_lwe;
static int hf_s5066dts_ack_only_acks;
/* { 2, "DATA_ACK"}, */
static int hf_s5066dts_data_ack_cpdu_start;
static int hf_s5066dts_data_ack_cpdu_end;
static int hf_s5066dts_data_ack_deliver_in_order;
static int hf_s5066dts_data_ack_drop_cpdu;
static int hf_s5066dts_data_ack_tx_win_uwe;
static int hf_s5066dts_data_ack_tx_win_lwe;
static int hf_s5066dts_data_ack_segmented_cpdu_size;
static int hf_s5066dts_data_ack_transmit_sequence_number;
static int hf_s5066dts_data_ack_rx_lwe;
static int hf_s5066dts_data_ack_acks;
/* { 3, "RESET_WIN_RESYNC"}, */
static int hf_s5066dts_reset_win_resync_unused;
static int hf_s5066dts_reset_win_resync_full_reset_command;
static int hf_s5066dts_reset_win_resync_reset_tx_win_rqst;
static int hf_s5066dts_reset_win_resync_reset_rx_win_cmnd;
static int hf_s5066dts_reset_win_resync_reset_ack;
static int hf_s5066dts_reset_win_resync_new_rx_lwe;
static int hf_s5066dts_reset_win_resync_reset_frame_id_number;
/* { 4, "EXP_DATA_ONLY"}, */
static int hf_s5066dts_exp_data_only_cpdu_start;
static int hf_s5066dts_exp_data_only_cpdu_end;
static int hf_s5066dts_exp_data_only_cpdu_id;
static int hf_s5066dts_exp_data_only_segmented_cpdu_size;
static int hf_s5066dts_exp_data_only_transmit_sequence_number;
/* { 5, "EXP_ACK_ONLY"}, */
static int hf_s5066dts_exp_ack_only_rx_lwe;
static int hf_s5066dts_exp_ack_only_acks;
/* { 6, "MANAGEMENT"}, */
static int hf_s5066dts_management_unused;
static int hf_s5066dts_management_extended_message_flag;
static int hf_s5066dts_management_message;
static int hf_s5066dts_management_ack;
static int hf_s5066dts_management_management_frame_id;
static int hf_s5066dts_management_extended_message;
static int hf_s5066dts_management_extended_message_hftrp_payload_size;
static int hf_s5066dts_management_extended_message_hftrp_ra;
static int hf_s5066dts_management_extended_message_hftrp_seq_id;
static int hf_s5066dts_management_extended_message_hftrp_gen_seq_id;
static int hf_s5066dts_management_extended_message_hftrp_new_successor_id;
static int hf_s5066dts_management_extended_message_hftrp_number_of_nodes;
/* { 7, "NON_ARQ_DATA"}, */
static int hf_s5066dts_non_arq_data_cpdu_id_1;
static int hf_s5066dts_non_arq_data_deliver_in_order;
static int hf_s5066dts_non_arq_data_group_address;
static int hf_s5066dts_non_arq_data_cpdu_id_2;
static int hf_s5066dts_non_arq_data_cpdu_size;
static int hf_s5066dts_non_arq_data_cpdu_segment_offset;
static int hf_s5066dts_non_arq_data_cpdu_reception_window;
static int hf_s5066dts_non_arq_data_segmented_cpdu_size;
/* { 8, "EXP_NON_ARQ_DATA"}, */
static int hf_s5066dts_exp_non_arq_data_cpdu_id_1;
static int hf_s5066dts_exp_non_arq_data_deliver_in_order;
static int hf_s5066dts_exp_non_arq_data_group_address;
static int hf_s5066dts_exp_non_arq_data_cpdu_id_2;
static int hf_s5066dts_exp_non_arq_data_cpdu_size;
static int hf_s5066dts_exp_non_arq_data_cpdu_segment_offset;
static int hf_s5066dts_exp_non_arq_data_cpdu_reception_window;
static int hf_s5066dts_exp_non_arq_data_segmented_cpdu_size;
/* {15, "WARNING"}, */
static int hf_s5066dts_warning_frame_type;
static int hf_s5066dts_warning_reason;

static int ett_s5066dts;
static int ett_s5066dts_eow;
static int ett_s5066dts_address;
static int ett_s5066dts_pdu;
static int ett_s5066dts_hftrp_token;

static const value_string s5066dts_dpdu_type[] = {
    { 0, "DATA_ONLY"},
    { 1, "ACK_ONLY"},
    { 2, "DATA_ACK"},
    { 3, "RESET_WIN_RESYNC"},
    { 4, "EXP_DATA_ONLY"},
    { 5, "EXP_ACK_ONLY"},
    { 6, "MANAGEMENT"},
    { 7, "NON_ARQ_DATA"},
    { 8, "EXP_NON_ARQ_DATA"},
    {15, "WARNING"},
    { 0, NULL},
};

static const value_string s5066dts_eow_type[] = {
    {  0, "RESERVED"},
    {  1, "DRC_REQUEST"},
    {  2, "DRC_RESPONSE"},
    {  3, "UNRECOGNIZED_TYPE"},
    {  4, "CAPABILITY"},
    {  5, "ALM_REQUEST"},
    {  6, "ALM_RESPONSE"},
    {  7, "HDR_DRC_REQUEST"},
    { 15, "HFTRP_TOKEN"},
    {  0, NULL},
};

static const value_string s5066dts_eow_data_rate[] = {
    { 0, "75 bps"},
    { 1, "150 bps"},
    { 2, "300 bps"},
    { 3, "600 bps"},
    { 4, "1200 bps"},
    { 5, "2400 bps"},
    { 6, "3200 bps"},
    { 7, "3600 bps"},
    { 8, "4800 bps"},
    { 9, "6400 bps"},
    { 10, "8000 bps"},
    { 11, "9600 bps"},
    {  0, NULL},
};

static const value_string s5066dts_eow_interleaving[] = {
    { 0, "No interleaving"},
    { 1, "Short interleaving"},
    { 2, "Long interleaving"},
    { 3, "Reserved"},
    { 0, NULL},
};

static const value_string s5066dts_eow_others[] = {
    { 0, "Request: Master has independent data rate"},
    { 1, "Request: Tx=Rx at master"},
    { 2, "Advisory: Advising node has independent data rate"},
    { 3, "Advisory: Tx=Rx at advising node"},
    { 0, NULL},
};

static const value_string s5066dts_eow_response[] = {
    { 0, "Accept"},
    { 1, "Refuse"},
    { 2, "Cancel"},
    { 3, "Confirm"},
    { 0, NULL},
};

static const value_string s5066dts_eow_reason[] = {
    { 0, "No reason"},
    { 1, "Tx and Rx parameters must be the same"},
    { 2, "Not possible to change modem data rate"},
    { 3, "Not possible to change modem interleaving"},
    { 4, "Not possible to change modem data rate or interleaving"},
    { 5, "Not consistent with local conditions"},
    { 0, NULL},
};

static const value_string s5066dts_eow_waveform[] = {
    { 0, "MS110A"},
    { 1, "MS110B"},
    { 2, "STANAG_4285"},
    { 3, "STANAG_4539"},
    { 4, "STANAG_4529"},
    { 5, "STANAG_4415"},
    { 6, "STANAG_4481_FSK"},
    { 7, "USER_CONFIGURATION_OPTION_1"},
    { 8, "USER_CONFIGURATION_OPTION_2"},
    { 9, "USER_CONFIGURATION_OPTION_3"},
    { 0, NULL},
};

/* Used in Packet List pane */
static const value_string s5066dts_eow_hftrp_frame_control_abbr[] = {
    { 1, "RTT"},
    { 2, "ACK"},
    { 3, "SLS"},
    { 4, "SET"},
    { 5, "REL"},
    { 6, "DEL"},
    { 0, NULL},
};

/* Used in Packet Details pane */
static const value_string s5066dts_eow_hftrp_frame_control[] = {
    { 1, "RTT - Right-to-transmit Token"},
    { 2, "ACK - Acknowledgment Token"},
    { 3, "SLS - Solicit Successor Token"},
    { 4, "SET - Set Successor Token"},
    { 5, "REL - Relayed Token"},
    { 6, "DEL - Delete Token"},
    { 0, NULL},
};

static const value_string s5066dts_alm_reason[] = {
    { 0, "No reason"},
    { 1, "Tx and Rx parameters must be the same"},
    { 2, "Not possible to change modem data rate"},
    { 3, "Not possible to change modem interleaving"},
    { 4, "Not possible to change modem data rate or interleaving"},
    { 5, "Not consistent with local conditions"},
    { 6, "Not possible to change frequency"},
    { 0, NULL},
};

/* Register functions' forward references */
void proto_reg_handoff_s5066dts(void);

/* { 1, "DRC_REQUEST"}, */
static void dissect_s5066dts_eow_drc_request(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_eow_drc_request_data_rate, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_drc_request_interleaving, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_drc_request_others, tvb, offset, 1, ENC_BIG_ENDIAN);
}

/* { 2, "DRC_RESPONSE"}, */
static void dissect_s5066dts_eow_drc_response(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_eow_drc_response_response, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_drc_response_reason, tvb, offset, 1, ENC_BIG_ENDIAN);
}

/* { 3, "UNRECOGNIZED_TYPE"}, */
static void dissect_s5066dts_eow_unrec_type(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_eow_unrec_type_response, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_unrec_type_reason, tvb, offset, 1, ENC_BIG_ENDIAN);
}

/* { 4, "CAPABILITY"}, */
static void dissect_s5066dts_eow_capability(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_eow_capability_adaptive, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_capability_stanag_4529, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_capability_mil_std_188_110a, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_capability_extended, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_capability_full_duplex, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_capability_split_frequency, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_capability_non_arcs_ale, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_capability_arcs, tvb, offset, 1, ENC_BIG_ENDIAN);
}

/* { 5, "ALM_REQUEST"}, */
static void dissect_s5066dts_eow_alm_request(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_eow_alm_request_data_rate, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_alm_request_interleaving, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_alm_request_others, tvb, offset, 1, ENC_BIG_ENDIAN);
}

/* { 6, "ALM_RESPONSE"}, */
static void dissect_s5066dts_eow_alm_response(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_eow_alm_response_response, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_alm_response_reason, tvb, offset, 1, ENC_BIG_ENDIAN);
}

/* { 7, "HDR_DRC_REQUEST"}, */
static void dissect_s5066dts_eow_hdr_drc_request(tvbuff_t *tvb, packet_info * pinfo, unsigned offset,
        proto_tree *tree, unsigned pdu_type)
{

    if (pdu_type != S5066_DPDU_MANAGEMENT)
    {
        expert_add_info(pinfo, tree, &ei_s5066dts_eow_hdr_drc_request_invalid);
        return;
    }

    proto_tree_add_item(tree, hf_s5066dts_eow_hdr_drc_request_waveform, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_eow_hdr_drc_request_num_channels, tvb, offset, 1, ENC_BIG_ENDIAN);

}

/* {15, "HFTRP FRAME CONTROL"}, */
static void dissect_s5066dts_eow_hftrp(tvbuff_t *tvb,  packet_info * pinfo, unsigned offset,
        proto_tree *tree, unsigned pdu_type)
{
    if (pdu_type != S5066_DPDU_MANAGEMENT)
    {
        expert_add_info(pinfo, tree, &ei_s5066dts_eow_hftrp_invalid);
        return;
    }

    proto_tree_add_item(tree, hf_s5066dts_eow_hftrp_hftrp_token, tvb, offset, 1, ENC_BIG_ENDIAN);
}

/*
 * Dissect EOW type according to C.5 EOW and Management Message Types
 */
static unsigned dissect_s5066dts_eow(tvbuff_t *tvb,  packet_info * pinfo, unsigned offset, proto_tree *tree,
        unsigned pdu_type)
{
    proto_tree *eow_tree;
    unsigned eow_type;

    eow_type = tvb_get_uint8(tvb, offset) & 0x0F;
    eow_tree = proto_tree_add_subtree(tree, tvb, offset, 2, ett_s5066dts_eow, NULL, "EOW Field");
    proto_tree_add_item(eow_tree, hf_s5066dts_eow_type, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;

    switch (eow_type)
    {
        case  S5066_EOW_RESERVED:
            proto_tree_add_item(eow_tree, hf_s5066dts_eow_data, tvb, offset, 1, ENC_BIG_ENDIAN); break;
        case  S5066_EOW_DRC_REQUEST:
            dissect_s5066dts_eow_drc_request(tvb, offset, eow_tree); break;
        case  S5066_EOW_DRC_RESPONSE:
            dissect_s5066dts_eow_drc_response(tvb, offset, eow_tree); break;
        case  S5066_EOW_UNRECOGNIZED_TYPE:
            dissect_s5066dts_eow_unrec_type(tvb, offset, eow_tree); break;
        case  S5066_EOW_CAPABILITY:
            dissect_s5066dts_eow_capability(tvb, offset, eow_tree); break;
        case  S5066_EOW_ALM_REQUEST:
            dissect_s5066dts_eow_alm_request(tvb, offset, eow_tree); break;
        case  S5066_EOW_ALM_RESPONSE:
            dissect_s5066dts_eow_alm_response(tvb, offset, eow_tree); break;
        case  S5066_EOW_HDR_DRC_REQUEST:
            dissect_s5066dts_eow_hdr_drc_request(tvb, pinfo, offset, eow_tree, pdu_type); break;
        case  S5066_EOW_HFTRP_TOKEN:
            dissect_s5066dts_eow_hftrp(tvb, pinfo, offset, eow_tree, pdu_type); break;
    }
    return ++offset;
}

static void
s5066dts_address_format( char *result, uint32_t address_value )
{
   snprintf( result, ITEM_LABEL_LENGTH, "%d.%d.%d.%d",
            address_value >> 24,
            (address_value >> 16) & 0xFF,
            (address_value >> 8) & 0xFF,
            address_value & 0xFF);
}

static unsigned dissect_s5066dts_address(tvbuff_t *tvb, unsigned offset, proto_tree *tree, packet_info *pinfo,
        unsigned addr_size)
{
    uint32_t source_address = 0, destination_address = 0;
    proto_tree *address_tree;
    unsigned int i;

    for ( i = 0; i < addr_size; i++)
    {
        destination_address = (destination_address << 4) | ((!(i % 2)
                ? (tvb_get_uint8(tvb, offset + i / 2) >> 4)
                : (tvb_get_uint8(tvb, offset + i / 2))) & 0x0F);
        source_address = (source_address << 4) | ((!((i + addr_size) % 2)
                ? (tvb_get_uint8(tvb, offset + (i + addr_size) / 2) >> 4)
                : (tvb_get_uint8(tvb, offset + (i + addr_size) / 2))) & 0x0F);
    }

    address_tree = proto_tree_add_subtree(tree, tvb, offset, addr_size, ett_s5066dts_address, NULL, "Destination & Source Addresses");

    proto_tree_add_uint(address_tree, hf_s5066dts_dest_addr, tvb, offset, addr_size - addr_size / 2, destination_address);
    proto_tree_add_uint(address_tree, hf_s5066dts_src_addr, tvb, offset + addr_size / 2, addr_size - addr_size / 2, source_address);

    col_add_fstr(pinfo->cinfo, COL_DEF_SRC, "%d.%d.%d.%d",
            source_address  >> 24,
            (source_address >> 16) & 0xFF,
            (source_address >> 8) & 0xFF,
            source_address & 0xFF);

    col_add_fstr(pinfo->cinfo, COL_DEF_DST, "%d.%d.%d.%d",
            destination_address  >> 24,
            (destination_address >> 16) & 0xFF,
            (destination_address >> 8) & 0xFF,
            destination_address & 0xFF);

    offset += addr_size;
    return offset;
}

static unsigned dissect_s5066dts_header_crc(tvbuff_t *tvb, unsigned offset, proto_tree *tree,
        unsigned address_size, unsigned header_size)
{
    uint16_t header_crc;
    proto_item *ti;

    header_crc = crc16_0x9949_tvb_offset_seed(tvb, S5066_DPDU_SYNC_SEQUENCE_SIZE,
                header_size + address_size - S5066_DPDU_SYNC_SEQUENCE_SIZE, 0);

    ti = proto_tree_add_item(tree, hf_s5066dts_header_crc, tvb, offset, 2, ENC_BIG_ENDIAN);
    if (header_crc == tvb_get_letohs(tvb, offset))
        proto_item_append_text(ti, " (Correct)");
    else
        proto_item_append_text(ti, " (Incorrect, should be %x)", header_crc);

    offset += 2;
    return offset;
}

static unsigned dissect_s5066dts_cpdu_crc(tvbuff_t *tvb, unsigned offset, proto_tree *tree,
        unsigned address_size, unsigned header_size, unsigned segmented_cpdu_size)
{
    uint32_t cpdu_crc;
    proto_item *ti;

    cpdu_crc = crc32_0x0AA725CF_tvb_offset_seed(tvb, header_size + address_size + S5066_DPDU_SYNC_SEQUENCE_SIZE,
              segmented_cpdu_size, 0);

    ti = proto_tree_add_item(tree, hf_s5066dts_cpdu_crc, tvb, offset, 4, ENC_BIG_ENDIAN);
    if (cpdu_crc == tvb_get_letohl(tvb, offset))
        proto_item_append_text(ti, " (Correct)");
    else
        proto_item_append_text(ti, " (Incorrect, should be %x)", cpdu_crc);

    offset +=4;
    return offset;
}

/* { 0, "DATA_ONLY"}, */
static unsigned dissect_s5066dts_data_only(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_data_only_cpdu_start, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_only_cpdu_end, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_only_deliver_in_order, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_only_drop_cpdu, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_only_tx_win_uwe, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_only_tx_win_lwe, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_only_segmented_cpdu_size, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;
    proto_tree_add_item(tree, hf_s5066dts_data_only_transmit_sequence_number, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;

    return offset;
}

/* { 1, "ACK_ONLY"}, */
static unsigned dissect_s5066dts_ack_only(tvbuff_t *tvb, unsigned offset, proto_tree *tree,
        unsigned header_size)
{
    unsigned ack_size;
    ack_size = header_size - 7;

    proto_tree_add_item(tree, hf_s5066dts_ack_only_rx_lwe, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
    if (ack_size > 0){
        proto_tree_add_item(tree, hf_s5066dts_ack_only_acks, tvb, offset, ack_size, ENC_NA); offset += ack_size;
    }

    return offset;
}

/* { 2, "DATA_ACK"}, */
static unsigned dissect_s5066dts_data_ack(tvbuff_t *tvb, unsigned offset, proto_tree *tree,
        unsigned header_size)
{
    unsigned ack_size;
    ack_size = header_size - 10;

    proto_tree_add_item(tree, hf_s5066dts_data_ack_cpdu_start, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_ack_cpdu_end, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_ack_deliver_in_order, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_ack_drop_cpdu, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_ack_tx_win_uwe, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_ack_tx_win_lwe, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_data_ack_segmented_cpdu_size, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;
    proto_tree_add_item(tree, hf_s5066dts_data_ack_transmit_sequence_number, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
    proto_tree_add_item(tree, hf_s5066dts_data_ack_rx_lwe, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
    if (ack_size > 0){
        proto_tree_add_item(tree, hf_s5066dts_data_ack_acks, tvb, offset, ack_size, ENC_NA); offset += ack_size;
    }

    return offset;
}

/* { 3, "RESET_WIN_RESYNC"}, */
static unsigned dissect_s5066dts_reset_win_resync(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_reset_win_resync_unused, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_reset_win_resync_full_reset_command, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_reset_win_resync_reset_tx_win_rqst, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_reset_win_resync_reset_rx_win_cmnd, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_reset_win_resync_reset_ack, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
    proto_tree_add_item(tree, hf_s5066dts_reset_win_resync_new_rx_lwe, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
    proto_tree_add_item(tree, hf_s5066dts_reset_win_resync_reset_frame_id_number, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;

    return offset;
}

/* { 4, "EXP_DATA_ONLY"}, */
static unsigned dissect_s5066dts_exp_data_only(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_exp_data_only_cpdu_start, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_exp_data_only_cpdu_end, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_exp_data_only_cpdu_id, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_exp_data_only_segmented_cpdu_size, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;
    proto_tree_add_item(tree, hf_s5066dts_exp_data_only_transmit_sequence_number, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;

    return offset;
}

/* { 5, "EXP_ACK_ONLY"}, */
static unsigned dissect_s5066dts_exp_ack_only(tvbuff_t *tvb, unsigned offset, proto_tree *tree,
        unsigned header_size)
{
    unsigned ack_size;
    ack_size = header_size - 7;

    proto_tree_add_item(tree, hf_s5066dts_exp_ack_only_rx_lwe, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
    if (ack_size > 0)
        proto_tree_add_item(tree, hf_s5066dts_exp_ack_only_acks, tvb, offset, ack_size, ENC_NA);
    offset += ack_size;

    return offset;
}

/* { 6, "MANAGEMENT"}, */
static unsigned dissect_s5066dts_management(tvbuff_t *tvb, unsigned offset, proto_tree *tree, unsigned header_size)
{
    uint8_t eow_content;
    proto_tree *hftrp_token_tree = NULL;
    unsigned eow_type;
    unsigned extended_message_size;

    eow_type = tvb_get_uint8(tvb, offset) & 0x0F;
    eow_content = tvb_get_uint8(tvb, S5066_DPDU_EOW_CONTENT_INDEX);
    extended_message_size = header_size - 8;

    proto_tree_add_item(tree, hf_s5066dts_management_unused, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_management_extended_message_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_management_message, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_management_ack, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
    proto_tree_add_item(tree, hf_s5066dts_management_management_frame_id, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset++;

    if (eow_type == S5066_EOW_HDR_DRC_REQUEST)
    {
        proto_tree_add_item(tree, hf_s5066dts_eow_hdr_drc_request_data_rate, tvb, offset, 4, ENC_BIG_ENDIAN);
        offset += 4;

        proto_tree_add_item(tree, hf_s5066dts_eow_hdr_drc_request_interleaver_length, tvb, offset, 2, ENC_BIG_ENDIAN);
        offset += 2;
    }
    else if (extended_message_size > 0)
    {
        /* If eow type is 15 then parse HFTRP token details */
        if (eow_type == S5066_EOW_HFTRP_TOKEN)
        {
            /* Add a new subtree for HFTRP token details */
            hftrp_token_tree = proto_tree_add_subtree_format(tree, tvb, offset, extended_message_size,
                    ett_s5066dts_hftrp_token, NULL, "HFTRP Token (%s)",
                    val_to_str_const(eow_content, s5066dts_eow_hftrp_frame_control, "UNKNOWN_HFTRP_TOKEN"));
            proto_tree_add_item(hftrp_token_tree,
                    hf_s5066dts_management_extended_message_hftrp_payload_size, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2;
            proto_tree_add_item(hftrp_token_tree,
                    hf_s5066dts_management_extended_message_hftrp_ra, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4;
            proto_tree_add_item(hftrp_token_tree,
                    hf_s5066dts_management_extended_message_hftrp_seq_id, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4;
            proto_tree_add_item(hftrp_token_tree,
                    hf_s5066dts_management_extended_message_hftrp_gen_seq_id, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4;
            proto_tree_add_item(hftrp_token_tree,
                    hf_s5066dts_management_extended_message_hftrp_new_successor_id, tvb, offset, 4, ENC_BIG_ENDIAN); offset += 4;
            proto_tree_add_item(hftrp_token_tree,
                    hf_s5066dts_management_extended_message_hftrp_number_of_nodes, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2;
        }
        /* otherwise just display it as a byte stream */
        else
        {
            proto_tree_add_item(tree, hf_s5066dts_management_extended_message, tvb, offset, extended_message_size, ENC_NA);
            offset += extended_message_size;
        }
    }

    return offset;
}

/* { 7, "NON_ARQ_DATA"}, */
static unsigned dissect_s5066dts_non_arq_data(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_non_arq_data_cpdu_id_1, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_non_arq_data_deliver_in_order, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_non_arq_data_group_address, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_non_arq_data_segmented_cpdu_size, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;
    proto_tree_add_item(tree, hf_s5066dts_non_arq_data_cpdu_id_2, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
    proto_tree_add_item(tree, hf_s5066dts_non_arq_data_cpdu_size, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;
    proto_tree_add_item(tree, hf_s5066dts_non_arq_data_cpdu_segment_offset, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;
    proto_tree_add_item(tree, hf_s5066dts_non_arq_data_cpdu_reception_window, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;

    return offset;
}

/* { 8, "EXP_NON_ARQ_DATA"}, */
static unsigned dissect_s5066dts_exp_non_arq_data(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_exp_non_arq_data_cpdu_id_1, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_exp_non_arq_data_deliver_in_order, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_exp_non_arq_data_group_address, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_exp_non_arq_data_segmented_cpdu_size, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;
    proto_tree_add_item(tree, hf_s5066dts_exp_non_arq_data_cpdu_id_2, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
    proto_tree_add_item(tree, hf_s5066dts_exp_non_arq_data_cpdu_size, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;
    proto_tree_add_item(tree, hf_s5066dts_exp_non_arq_data_cpdu_segment_offset, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;
    proto_tree_add_item(tree, hf_s5066dts_exp_non_arq_data_cpdu_reception_window, tvb, offset, 2, ENC_BIG_ENDIAN); offset +=2;

    return offset;
}

/* {15, "WARNING"}, */
static unsigned dissect_s5066dts_warning(tvbuff_t *tvb, unsigned offset, proto_tree *tree)
{
    proto_tree_add_item(tree, hf_s5066dts_warning_frame_type, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(tree, hf_s5066dts_warning_reason, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;

    return offset;
}

static unsigned calculate_s5066dts_dpdu_len(packet_info *pinfo _U_, tvbuff_t *tvb,
                                         int offset _U_, void *data _U_)
{
    unsigned pdu_type;
    unsigned address_size;
    unsigned header_size;
    unsigned pdu_size;
    unsigned segmented_cpdu_size;

    /* XXX: why is the offset not used to get this value? */
    if (tvb_get_uint8(tvb, 0) != 0x90)
        return 1;
    else if (tvb_get_uint8(tvb, 1) != 0xEB)
        return 2;

    pdu_type = (tvb_get_uint8(tvb, 2) & 0xF0) >> 4;
    address_size = (tvb_get_uint8(tvb, S5066_DPDU_SIZE_OF_ADDRESS_INDEX) & 0xE0) >> 5;
    header_size = tvb_get_uint8(tvb, S5066_DPDU_SIZE_OF_HEADER_INDEX) & 0x1F;
    pdu_size = header_size + address_size + S5066_DPDU_SYNC_SEQUENCE_SIZE;

    if (pdu_type == S5066_DPDU_DATA_ONLY || pdu_type == S5066_DPDU_DATA_ACK ||
            pdu_type == S5066_DPDU_EXP_DATA_ONLY || pdu_type == S5066_DPDU_NON_ARQ_DATA ||
            pdu_type == S5066_DPDU_EXP_NON_ARQ_DATA)
    {
        segmented_cpdu_size = tvb_get_ntohs(tvb, 6 + address_size) & 0x03FF;
        pdu_size += segmented_cpdu_size + 4;
    }
    return pdu_size;
}

static int dissect_s5066dts(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
    proto_tree *s5066dts_tree = NULL, *pdu_tree = NULL;
    proto_item *ti = NULL;
    unsigned offset = 0;
    unsigned pdu_type;
    unsigned address_size;
    unsigned header_size;
    unsigned segmented_cpdu_size;
    /* Add EOW (Engineering OrderWire */
    uint8_t eow_type;
    uint8_t eow_content;

    if (tvb_get_uint8(tvb, 0) != 0x90 || tvb_get_uint8(tvb, 1) != 0xEB) {
        /* Cannot find sync pattern at dissect_s5066dts()! */
        return 0;
    }

    col_set_str(pinfo->cinfo, COL_PROTOCOL, DISSECTOR_NAME);
    pdu_type = (tvb_get_uint8(tvb, 2) & 0xF0) >> 4;

    /* Add DPDU type and name */
    col_add_fstr(pinfo->cinfo, COL_INFO, "DpduType=%d (%s)", pdu_type, val_to_str(pdu_type, s5066dts_dpdu_type,
            "Unknown (0x%02x)"));

    address_size = (tvb_get_uint8(tvb, S5066_DPDU_SIZE_OF_ADDRESS_INDEX) & 0xE0) >> 5;
    eow_type = tvb_get_uint8(tvb, S5066_DPDU_EOW_TYPE_INDEX) & 0x0F;
    eow_content = tvb_get_uint8(tvb, S5066_DPDU_EOW_CONTENT_INDEX);

    switch (eow_type)
    {
        case S5066_EOW_RESERVED:
            col_append_str(pinfo->cinfo, COL_INFO, " EowType=RESERVED");
            break;
        case S5066_EOW_DRC_REQUEST: /* Data Rate Change Request */
        case S5066_EOW_DRC_RESPONSE: /* Data Rate Change Response */
        case S5066_EOW_UNRECOGNIZED_TYPE: /* Unrecognized Type Error */
        case S5066_EOW_CAPABILITY: /* Capability Advertisement */
        case S5066_EOW_ALM_REQUEST: /* Frequency Change / ALM Request */
        case S5066_EOW_ALM_RESPONSE: /* Frequency Change / ALM Response */
        case S5066_EOW_HDR_DRC_REQUEST: /* High Data Rate (HDR) Change Request */
            col_append_fstr(pinfo->cinfo, COL_INFO, " EowType=%d (%s)", eow_type,
                    val_to_str_const(eow_type, s5066dts_eow_type, "UNKNOWN_EOW_TYPE"));
            break;
        case 8: /* Unspecified/User Defined */
        case 9: /* Unspecified/User Defined */
        case 10: /* Unspecified/User Defined */
        case 11: /* Unspecified/User Defined */
        case 12: /* Unspecified/User Defined */
        case 13: /* Unspecified/User Defined */
        case 14: /* Unspecified/User Defined */
            col_append_str(pinfo->cinfo, COL_INFO, " EowType=UNSPECIFIED");
            break;
        case S5066_EOW_HFTRP_TOKEN:
            col_append_fstr(pinfo->cinfo, COL_INFO, " EowType=%d (%s:%s)", eow_type,
                    val_to_str_const(eow_type, s5066dts_eow_type, "UNKNOWN_EOW_TYPE"),
                    val_to_str_const(eow_content, s5066dts_eow_hftrp_frame_control_abbr, "UNKNOWN_HFTRP_TOKEN"));
            break;
    }

    /* Append EOT (End of Transmission) */
    col_append_fstr(pinfo->cinfo, COL_INFO, " EOT=%d", tvb_get_uint8(tvb, S5066_DPDU_EOT_INDEX));

    /* Append DPDU-specific information */
    switch (pdu_type)
    {
        case S5066_DPDU_DATA_ONLY:
        case S5066_DPDU_EXP_DATA_ONLY:
            col_append_fstr(pinfo->cinfo, COL_INFO, " Seq=%d", tvb_get_uint8(tvb, 8 + address_size));
            break;
        case S5066_DPDU_ACK_ONLY:
        case S5066_DPDU_EXP_ACK_ONLY:
            col_append_fstr(pinfo->cinfo, COL_INFO, " RxLWE=%d", tvb_get_uint8(tvb, 6 + address_size));
            break;
        case S5066_DPDU_DATA_ACK:
            col_append_fstr(pinfo->cinfo, COL_INFO, " Seq=%d RxLWE=%d",
                    tvb_get_uint8(tvb, 8 + address_size),
                    tvb_get_uint8(tvb, 9 + address_size));
            break;
        case S5066_DPDU_MANAGEMENT:
            col_append_fstr(pinfo->cinfo, COL_INFO, " FrameID=%d", tvb_get_uint8(tvb, 7 + address_size));
            break;
    }

    if (tree)
    {
        ti = proto_tree_add_protocol_format(tree, proto_s5066dts, tvb, 0, -1, "STANAG 5066 (DTS Layer)");
        s5066dts_tree = proto_item_add_subtree(ti, ett_s5066dts);
        proto_tree_add_item(s5066dts_tree, hf_s5066dts_sync_word, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2;
        proto_tree_add_item(s5066dts_tree, hf_s5066dts_dpdu_type, tvb, offset, 1, ENC_BIG_ENDIAN);
        offset = dissect_s5066dts_eow(tvb, pinfo, offset, s5066dts_tree, pdu_type);

        /*
         * Append DPDU type to the root
         */
        proto_item_append_text(ti, ", DPDU Type %s ", val_to_str_const(pdu_type, s5066dts_dpdu_type, "UNKNOWN_DPDU_TYPE"));
        proto_tree_add_item(s5066dts_tree, hf_s5066dts_eot, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
        proto_tree_add_item(s5066dts_tree, hf_s5066dts_address_size, tvb, offset, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(s5066dts_tree, hf_s5066dts_header_size, tvb, offset, 1, ENC_BIG_ENDIAN); offset++;
        offset = dissect_s5066dts_address(tvb, offset, s5066dts_tree, pinfo, address_size);
        header_size = tvb_get_uint8(tvb, S5066_DPDU_SIZE_OF_HEADER_INDEX) & 0x1F;
        pdu_tree = proto_tree_add_subtree(s5066dts_tree, tvb, offset, header_size - 6, ett_s5066dts_pdu, NULL, "D_PDU Type Specific Header");

        switch (pdu_type)
        {
            case  S5066_DPDU_DATA_ONLY: offset = dissect_s5066dts_data_only(tvb, offset, pdu_tree); break;
            case  S5066_DPDU_ACK_ONLY: offset = dissect_s5066dts_ack_only(tvb, offset, pdu_tree, header_size); break;
            case  S5066_DPDU_DATA_ACK: offset = dissect_s5066dts_data_ack(tvb, offset, pdu_tree, header_size); break;
            case  S5066_DPDU_RESET_WIN_RESYNC: offset = dissect_s5066dts_reset_win_resync(tvb, offset, pdu_tree); break;
            case  S5066_DPDU_EXP_DATA_ONLY: offset = dissect_s5066dts_exp_data_only(tvb, offset, pdu_tree); break;
            case  S5066_DPDU_EXP_ACK_ONLY: offset = dissect_s5066dts_exp_ack_only(tvb, offset, pdu_tree, header_size); break;
            case  S5066_DPDU_MANAGEMENT: offset = dissect_s5066dts_management(tvb, offset, pdu_tree, header_size); break;
            case  S5066_DPDU_NON_ARQ_DATA: offset = dissect_s5066dts_non_arq_data(tvb, offset, pdu_tree); break;
            case  S5066_DPDU_EXP_NON_ARQ_DATA: offset = dissect_s5066dts_exp_non_arq_data(tvb, offset, pdu_tree); break;
            case  S5066_DPDU_WARNING: offset = dissect_s5066dts_warning(tvb, offset, pdu_tree); break;
        }
        offset = dissect_s5066dts_header_crc(tvb, offset, s5066dts_tree, address_size, header_size);
        if (pdu_type == S5066_DPDU_DATA_ONLY || pdu_type == S5066_DPDU_DATA_ACK
                || pdu_type == S5066_DPDU_EXP_DATA_ONLY || pdu_type == S5066_DPDU_NON_ARQ_DATA
                || pdu_type == S5066_DPDU_EXP_NON_ARQ_DATA)
        {
            segmented_cpdu_size = tvb_get_ntohs(tvb, 6 + address_size) & 0x03FF;
            proto_tree_add_item(s5066dts_tree, hf_s5066dts_segmented_cpdu, tvb, offset, segmented_cpdu_size, ENC_NA);
            offset += segmented_cpdu_size;
            /*offset = */dissect_s5066dts_cpdu_crc(tvb, offset, s5066dts_tree, address_size, header_size, segmented_cpdu_size);
        }
    }

    return tvb_captured_length(tvb);
}

static int dissect_s5066dts_raw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
    unsigned b_length =  tvb_captured_length(tvb);

    /* Make sure there are enough bytes for a DPDU */
    if ( b_length < S5066_DPDU_FRAME_HEADER_LEN){
        /* "There are not enough bytes for a DPDU! */
        return 0;
    }

    /* Check if the first two bytes are 0x90 and 0xEB
     * If not then this is neither a DPDU nor an un-reassembled one
     */
    if ((tvb_get_uint8(tvb, 0) != 0x90) || (tvb_get_uint8(tvb, 1) != 0xEB)) {
        /* Cannot find sync pattern at dissect_s5066dts_raw()! */
        return 0;
    }
    calculate_s5066dts_dpdu_len(pinfo, tvb, 0, NULL);
    dissect_s5066dts(tvb, pinfo, tree, NULL);

    return b_length;
}

static int dissect_s5066dts_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
    unsigned b_length = tvb_captured_length(tvb);

    /* Make sure there are enough bytes for a DPDU */
    if ( b_length < S5066_DPDU_FRAME_HEADER_LEN){
        /* "There are not enough bytes for a DPDU! */
        return 0;
    }

    /* Check if the first two bytes are 0x90 and 0xEB
     * If not then this is neitger a DPDU nor an un-reassembled one
     */
    if ((tvb_get_uint8(tvb, 0) != 0x90) || (tvb_get_uint8(tvb, 1) != 0xEB)) {
        /* Cannot find sync pattern at dissect_s5066dts_tcp()! */
        return 0;
    }

    /* Drop packets with port matches other than the destination port. */
    if (!value_is_in_range(config_s5066dts_ports, pinfo->destport)) {
        /* Configured to dissect TCP destination port matches only, dropping.. */
        return 0;
    }

    tcp_dissect_pdus(tvb, pinfo, tree, config_proto_desegment, S5066_DPDU_FRAME_HEADER_LEN, calculate_s5066dts_dpdu_len,
                dissect_s5066dts, data);

    return b_length;
}

static void
apply_s5066dts_prefs(void)
{
    /* STANAG 5066 uses the port preference for some heuristics */
    config_s5066dts_ports = prefs_get_range_value("s5066dts", "tcp.port");
}

void proto_register_s5066dts (void)
{
    module_t *s5066dts_module;
    static hf_register_info hf[] = {
            { &hf_s5066dts_sync_word,
                { "Sync preamble", "s5066dts.sync", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_dpdu_type,
                { "D_PDU type", "s5066dts.type", FT_UINT8, BASE_DEC, VALS(s5066dts_dpdu_type), 0xF0, NULL, HFILL }
            },
            { &hf_s5066dts_eow_type,
                { "EOW type", "s5066dts.eow.type", FT_UINT8, BASE_DEC, VALS(s5066dts_eow_type), 0x0F, NULL, HFILL }
            },
            { &hf_s5066dts_eow_data,
                { "EOW data", "s5066dts.eow.data", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_eot,
                { "EOT", "s5066dts.eot", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_address_size,
                { "Address size (1/2 bytes)", "s5066dts.address.size", FT_UINT8, BASE_DEC, NULL, 0xE0, NULL, HFILL }
            },
            { &hf_s5066dts_header_size,
                { "Header size", "s5066dts.header_size", FT_UINT8, BASE_DEC, NULL, 0x1F, NULL, HFILL }
            },
            { &hf_s5066dts_segmented_cpdu,
                { "C_PDU Segment", "s5066dts.segmented_cpdu", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_dest_addr,
                { "Destination Address", "s5066dts.dest_addr", FT_UINT32, BASE_CUSTOM, CF_FUNC(s5066dts_address_format), 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_src_addr,
                { "Source Address", "s5066dts.src_addr", FT_UINT32, BASE_CUSTOM, CF_FUNC(s5066dts_address_format), 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_header_crc,
                { "CRC on header", "s5066dts.header_crc", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_cpdu_crc,
                { "CRC on C_PDU segment", "s5066dts.cpdu_crc", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }
            },
            /* { 1, "DRC_REQUEST"}, */
            { &hf_s5066dts_eow_drc_request_data_rate,
                { "Data Rate", "s5066dts.eow.drc_request.data_rate", FT_UINT8, BASE_DEC, VALS(s5066dts_eow_data_rate),
                        0xF0, NULL, HFILL }
            },
            { &hf_s5066dts_eow_drc_request_interleaving,
                { "Interleaver parameter", "s5066dts.eow.drc_request.interleaving", FT_UINT8, BASE_DEC,
                        VALS(s5066dts_eow_interleaving), 0x0C, NULL, HFILL }
            },
            { &hf_s5066dts_eow_drc_request_others,
                { "Other parameters", "s5066dts.eow.drc_request.others", FT_UINT8, BASE_DEC,
                        VALS(s5066dts_eow_others), 0x03, NULL, HFILL }
            },
            /* { 2, "DRC_RESPONSE"}, */
            { &hf_s5066dts_eow_drc_response_response,
                { "Response for DRC", "s5066dts.eow.drc_response.response", FT_UINT8, BASE_DEC,
                        VALS(s5066dts_eow_response), 0xE0, NULL, HFILL }
            },
            { &hf_s5066dts_eow_drc_response_reason,
                { "Reason", "s5066dts.eow.drc_response.reason", FT_UINT8, BASE_DEC,
                        VALS(s5066dts_eow_reason), 0x1F, NULL, HFILL }
            },
            /* { 3, "UNRECOGNIZED_TYPE"}, */
            { &hf_s5066dts_eow_unrec_type_response,
                { "This value should be set to 0", "s5066dts.eow.unrec_type.response", FT_UINT8, BASE_DEC,
                        NULL, 0xE0, NULL, HFILL }
            },
            { &hf_s5066dts_eow_unrec_type_reason,
                { "Reason", "s5066dts.eow.unrec_type.reason", FT_UINT8, BASE_DEC, NULL, 0x1F, NULL, HFILL }
            },
            /* { 4, "CAPABILITY"}, */
            { &hf_s5066dts_eow_capability_adaptive,
                { "Adaptive modem parameters capable", "s5066dts.eow.capability.adaptive", FT_BOOLEAN, 8, NULL, 0x80, NULL, HFILL }
            },
            { &hf_s5066dts_eow_capability_stanag_4529,
                { "STANAG 4529 available", "s5066dts.eow.capability.stanag_4529", FT_BOOLEAN, 8, NULL, 0x40, NULL, HFILL }
            },
            { &hf_s5066dts_eow_capability_mil_std_188_110a,
                { "MIL-STD-188-110A available", "s5066dts.eow.capability.mil_std_188_110a", FT_BOOLEAN, 8, NULL, 0x20, NULL, HFILL }
            },
            { &hf_s5066dts_eow_capability_extended,
                { "Extended data rate available", "s5066dts.eow.capability.extended", FT_BOOLEAN, 8, NULL, 0x10, NULL, HFILL }
            },
            { &hf_s5066dts_eow_capability_full_duplex,
                { "Full duplex supported", "s5066dts.eow.capability.full_duplex", FT_BOOLEAN, 8, NULL, 0x08, NULL, HFILL }
            },
            { &hf_s5066dts_eow_capability_split_frequency,
                { "Split frequency supported", "s5066dts.eow.capability.split_frequency", FT_BOOLEAN, 8, NULL, 0x04, NULL, HFILL }
            },
            { &hf_s5066dts_eow_capability_non_arcs_ale,
                { "Non-ARCS ALE capable", "s5066dts.eow.capability.non_arcs_ale", FT_BOOLEAN, 8, NULL, 0x02, NULL, HFILL }
            },
            { &hf_s5066dts_eow_capability_arcs,
                { "ARCS capable", "s5066dts.eow.capability.arcs", FT_BOOLEAN, 8, NULL, 0x01, NULL, HFILL }
            },
            /* { 5, "ALM_REQUEST"}, */
            { &hf_s5066dts_eow_alm_request_data_rate,
                { "Data Rate", "s5066dts.eow.alm_request.data_rate", FT_UINT8, BASE_DEC,
                        VALS(s5066dts_eow_data_rate), 0xF0, NULL, HFILL }
            },
            { &hf_s5066dts_eow_alm_request_interleaving,
                { "Interleaver parameter", "s5066dts.eow.alm_request.interleaving", FT_UINT8, BASE_DEC,
                        VALS(s5066dts_eow_interleaving), 0x0C, NULL, HFILL }
            },
            { &hf_s5066dts_eow_alm_request_others,
                { "Other parameters", "s5066dts.eow.alm_request.others", FT_UINT8, BASE_DEC,
                        VALS(s5066dts_eow_others), 0x03, NULL, HFILL }
            },
            /* { 6, "ALM_RESPONSE"}, */
            { &hf_s5066dts_eow_alm_response_response,
                { "Response for DRC", "s5066dts.eow.alm_response.response", FT_UINT8, BASE_DEC,
                        VALS(s5066dts_eow_response), 0xE0, NULL, HFILL }
            },
            { &hf_s5066dts_eow_alm_response_reason,
                { "Reason", "s5066dts.eow.alm_response.reason", FT_UINT8, BASE_DEC, VALS(s5066dts_alm_reason), 0x1F, NULL, HFILL }
            },
            /* { 7, "HDR_DRC_REQUEST"}, */
            { &hf_s5066dts_eow_hdr_drc_request_waveform,
                { "Modem waveform", "s5066dts.eow.hdr_drc_request.waveform", FT_UINT8, BASE_DEC,
                        VALS(s5066dts_eow_waveform), 0xF8, NULL, HFILL }
            },
            { &hf_s5066dts_eow_hdr_drc_request_num_channels,
                { "Number of channels", "s5066dts.eow.hdr_drc_request.num_channels", FT_UINT8, BASE_DEC, NULL, 0x07, NULL, HFILL }
            },
            { &hf_s5066dts_eow_hdr_drc_request_data_rate,
                { "Requested data rate for each channel", "s5066dts.eow.hdr_drc_request.data_rate",
                        FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_eow_hdr_drc_request_interleaver_length,
                { "Interleaver length for each channel", "s5066dts.eow.hdr_drc_request.interleaver_length",
                        FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            /* { 15, "HFTRP FRAME CONTROL"}, */
            { &hf_s5066dts_eow_hftrp_hftrp_token,
                { "HFTRP Token Type", "s5066dts.eow.hftrp.token_type", FT_UINT8, BASE_DEC, NULL, 0x00, NULL, HFILL }
            },
            /* { 0, "DATA_ONLY"}, */
            { &hf_s5066dts_data_only_cpdu_start,
                { "C_PDU Start", "s5066dts.data_only.cpdu_start", FT_BOOLEAN, 8, NULL, 0x80, NULL, HFILL }
            },
            { &hf_s5066dts_data_only_cpdu_end,
                { "C_PDU End", "s5066dts.data_only.cpdu_end", FT_BOOLEAN, 8, NULL, 0x40, NULL, HFILL }
            },
            { &hf_s5066dts_data_only_deliver_in_order,
                { "C_PDU Deliver-in-Order", "s5066dts.data_only.deliver_in_order", FT_BOOLEAN, 8, NULL, 0x20, NULL, HFILL }
            },
            { &hf_s5066dts_data_only_drop_cpdu,
                { "Drop C_PDU", "s5066dts.data_only.drop_cpdu", FT_BOOLEAN, 8, NULL, 0x10, NULL, HFILL }
            },
            { &hf_s5066dts_data_only_tx_win_uwe,
                { "TX WIN UWE", "s5066dts.data_only.tx_win_uwe", FT_BOOLEAN, 8, NULL, 0x08, NULL, HFILL }
            },
            { &hf_s5066dts_data_only_tx_win_lwe,
                { "TX WIN LWE", "s5066dts.data_only.tx_win_lwe", FT_BOOLEAN, 8, NULL, 0x04, NULL, HFILL }
            },
            { &hf_s5066dts_data_only_segmented_cpdu_size,
                { "Size of segmented C_PDU", "s5066dts.data_only.segmented_cpdu_size", FT_UINT16, BASE_DEC,
                        NULL, 0x03FF, NULL, HFILL }
            },
            { &hf_s5066dts_data_only_transmit_sequence_number,
                { "TX Frame Sequence Number", "s5066dts.data_only.transmit_sequence_number", FT_UINT8, BASE_DEC,
                        NULL, 0x0, NULL, HFILL }
            },
            /* { 1, "ACK_ONLY"}, */
            { &hf_s5066dts_ack_only_rx_lwe,
                { "RX LWE", "s5066dts.ack_only.rx_lwe", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_ack_only_acks,
                { "Selective ACK", "s5066dts.ack_only.acks", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
            },
            /* { 2, "DATA_ACK"}, */
            { &hf_s5066dts_data_ack_cpdu_start,
                { "C_PDU Start", "s5066dts.data_ack.cpdu_start", FT_BOOLEAN, 8, NULL, 0x80, NULL, HFILL }
            },
            { &hf_s5066dts_data_ack_cpdu_end,
                { "C_PDU End", "s5066dts.data_ack.cpdu_end", FT_BOOLEAN, 8, NULL, 0x40, NULL, HFILL }
            },
            { &hf_s5066dts_data_ack_deliver_in_order,
                { "C_PDU Deliver-in-Order", "s5066dts.data_ack.deliver_in_order", FT_BOOLEAN, 8, NULL, 0x20, NULL, HFILL }
            },
            { &hf_s5066dts_data_ack_drop_cpdu,
                { "Drop C_PDU", "s5066dts.data_ack.drop_cpdu", FT_BOOLEAN, 8, NULL, 0x10, NULL, HFILL }
            },
            { &hf_s5066dts_data_ack_tx_win_uwe,
                { "TX WIN UWE", "s5066dts.data_ack.tx_win_uwe", FT_BOOLEAN, 8, NULL, 0x08, NULL, HFILL }
            },
            { &hf_s5066dts_data_ack_tx_win_lwe,
                { "TX WIN LWE", "s5066dts.data_ack.tx_win_lwe", FT_BOOLEAN, 8, NULL, 0x04, NULL, HFILL }
            },
            { &hf_s5066dts_data_ack_segmented_cpdu_size,
                { "Size of segmented C_PDU", "s5066dts.data_ack.segmented_cpdu_size", FT_UINT16, BASE_DEC,
                        NULL, 0x03FF, NULL, HFILL }
            },
            { &hf_s5066dts_data_ack_transmit_sequence_number,
                { "TX frame sequence number", "s5066dts.data_ack.transmit_sequence_number", FT_UINT8, BASE_DEC,
                        NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_data_ack_rx_lwe,
                { "RX LWE", "s5066dts.data_ack.rx_lwe", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_data_ack_acks,
                { "Selective ACK", "s5066dts.data_ack.acks", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
            },
            /* { 3, "RESET_WIN_RESYNC"}, */
            { &hf_s5066dts_reset_win_resync_unused,
                { "Unused", "s5066dts.reset_win_resync.unused", FT_UINT8, BASE_HEX, NULL, 0xF0, NULL, HFILL }
            },
            { &hf_s5066dts_reset_win_resync_full_reset_command,
                { "Full reset command", "s5066dts.reset_win_resync.full_reset", FT_BOOLEAN, 8, NULL, 0x08, NULL, HFILL }
            },
            { &hf_s5066dts_reset_win_resync_reset_tx_win_rqst,
                { "Reset TX-WIN request", "s5066dts.reset_win_resync.reset_tx_win", FT_BOOLEAN, 8, NULL, 0x04, NULL, HFILL }
            },
            { &hf_s5066dts_reset_win_resync_reset_rx_win_cmnd,
                { "Reset RX-WIN command", "s5066dts.reset_win_resync.reset_rx_win", FT_BOOLEAN, 8, NULL, 0x02, NULL, HFILL }
            },
            { &hf_s5066dts_reset_win_resync_reset_ack,
                { "Reset acknowledgment", "s5066dts.reset_win_resync.reset_ack", FT_BOOLEAN, 8, NULL, 0x01, NULL, HFILL }
            },
            { &hf_s5066dts_reset_win_resync_new_rx_lwe,
                { "New receiver ARQ RX-LWE", "s5066dts.reset_win_resync.new_rx_lwe", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_reset_win_resync_reset_frame_id_number,
                { "Reset frame ID number", "s5066dts.reset_win_resync.reset_frame_id", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            /* { 4, "EXP_DATA_ONLY"}, */
            { &hf_s5066dts_exp_data_only_cpdu_start,
                { "C_PDU Start", "s5066dts.exp_data_only.cpdu_start", FT_BOOLEAN, 8, NULL, 0x80, NULL, HFILL }
            },
            { &hf_s5066dts_exp_data_only_cpdu_end,
                { "C_PDU End", "s5066dts.exp_data_only.cpdu_end", FT_BOOLEAN, 8, NULL, 0x40, NULL, HFILL }
            },
            { &hf_s5066dts_exp_data_only_cpdu_id,
                { "Segmented C_PDU ID", "s5066dts.exp_data_only.cpdu_id", FT_UINT8, BASE_DEC, NULL, 0x3C, NULL, HFILL }
            },
            { &hf_s5066dts_exp_data_only_segmented_cpdu_size,
                { "Size of segmented C_PDU", "s5066dts.exp_data_only.segmented_cpdu_size", FT_UINT16, BASE_DEC, NULL, 0x03FF, NULL, HFILL }
            },
            { &hf_s5066dts_exp_data_only_transmit_sequence_number,
                { "TX frame sequence number", "s5066dts.exp_data_only.transmit_sequence_number", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            /* { 5, "EXP_ACK_ONLY"}, */
            { &hf_s5066dts_exp_ack_only_rx_lwe,
                { "RX LWE", "s5066dts.exp_ack_only.rx_lwe", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_exp_ack_only_acks,
                { "Selective ACK", "s5066dts.exp_ack_only.acks", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
            },
            /* { 6, "MANAGEMENT"}, */
            { &hf_s5066dts_management_unused,
                { "Unused", "s5066dts.management.unused", FT_UINT8, BASE_HEX, NULL, 0xF8, NULL, HFILL }
            },
            { &hf_s5066dts_management_extended_message_flag,
                { "Extended message flag", "s5066dts.management.extended_message_flag", FT_BOOLEAN, 8, NULL, 0x04, NULL, HFILL }
            },
            { &hf_s5066dts_management_message,
                { "Valid message", "s5066dts.management.message", FT_BOOLEAN, 8, NULL, 0x02, NULL, HFILL }
            },
            { &hf_s5066dts_management_ack,
                { "Acknowledgment", "s5066dts.management.ack", FT_BOOLEAN, 8, NULL, 0x01, NULL, HFILL }
            },
            { &hf_s5066dts_management_management_frame_id,
                { "Management frame ID number", "s5066dts.management.management_frame_id", FT_UINT8, BASE_DEC,
                        NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_management_extended_message,
                { "Extended management message", "s5066dts.management.extended_message", FT_BYTES, BASE_NONE,
                        NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_management_extended_message_hftrp_payload_size,
                { "Payload Size", "s5066dts.management.extended_message.reserved", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_management_extended_message_hftrp_ra,
                { "Ring Address", "s5066dts.management.extended_message.ring_address", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_management_extended_message_hftrp_seq_id,
                { "Sequence ID", "s5066dts.management.extended_message.sequence_id", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_management_extended_message_hftrp_gen_seq_id,
                { "Generation Sequence ID", "s5066dts.management.extended_message.generation_sequence_id",
                        FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_management_extended_message_hftrp_new_successor_id,
                { "New Successor ID", "s5066dts.management.extended_message.new_successor_id", FT_UINT32, BASE_DEC,
                        NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_management_extended_message_hftrp_number_of_nodes,
                { "Number of Nodes", "s5066dts.management.extended_message.number_of_nodes", FT_UINT16, BASE_DEC,
                        NULL, 0x0, NULL, HFILL }
            },
            /* { 7, "NON_ARQ_DATA"}, */
            { &hf_s5066dts_non_arq_data_cpdu_id_1,
                { "C_PDU ID number (field 1)", "s5066dts.non_arq_data.cpdu_id_1", FT_UINT8, BASE_DEC, NULL, 0xF0, NULL, HFILL }
            },
            { &hf_s5066dts_non_arq_data_deliver_in_order,
                { "C_PDU Deliver-in-Order", "s5066dts.non_arq_data.deliver_in_order", FT_BOOLEAN, 8, NULL, 0x08, NULL, HFILL }
            },
            { &hf_s5066dts_non_arq_data_group_address,
                { "Group Address", "s5066dts.non_arq_data.group_address", FT_BOOLEAN, 8, NULL, 0x04, NULL, HFILL }
            },
            { &hf_s5066dts_non_arq_data_cpdu_id_2,
                { "C_PDU ID number (field 2)", "s5066dts.non_arq_data.cpdu_id_2", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_non_arq_data_cpdu_size,
                { "C_PDU size", "s5066dts.non_arq_data.cpdu_size", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_non_arq_data_cpdu_segment_offset,
                { "Offset of segmented C_PDU", "s5066dts.non_arq_data.cpdu_segment_offset", FT_UINT16, BASE_DEC,
                        NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_non_arq_data_cpdu_reception_window,
                { "C_PDU reception window", "s5066dts.non_arq_data.cpdu_reception_window", FT_UINT16, BASE_DEC,
                        NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_non_arq_data_segmented_cpdu_size,
                { "Size of segmented C_PDU", "s5066dts.non_arq_data.segmented_cpdu_size", FT_UINT16, BASE_DEC,
                        NULL, 0x03FF, NULL, HFILL }
            },
            /* { 8, "EXP_NON_ARQ_DATA"}, */
            { &hf_s5066dts_exp_non_arq_data_cpdu_id_1,
                { "C_PDU ID number (field 1)", "s5066dts.exp_non_arq_data.cpdu_id_1", FT_UINT8, BASE_DEC, NULL, 0xF0, NULL, HFILL }
            },
            { &hf_s5066dts_exp_non_arq_data_deliver_in_order,
                { "C_PDU Deliver-in-Order", "s5066dts.exp_non_arq_data.deliver_in_order", FT_BOOLEAN, 8, NULL, 0x08, NULL, HFILL }
            },
            { &hf_s5066dts_exp_non_arq_data_group_address,
                { "Group Address", "s5066dts.exp_non_arq_data.group_address", FT_BOOLEAN, 8, NULL, 0x04, NULL, HFILL }
            },
            { &hf_s5066dts_exp_non_arq_data_cpdu_id_2,
                { "C_PDU ID number (field 2)", "s5066dts.exp_non_arq_data.cpdu_id_2", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_exp_non_arq_data_cpdu_size,
                { "C_PDU size", "s5066dts.exp_non_arq_data.cpdu_size", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_exp_non_arq_data_cpdu_segment_offset,
                { "Offset of segmented C_PDU", "s5066dts.exp_non_arq_data.cpdu_segment_offset", FT_UINT16, BASE_DEC,
                        NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_exp_non_arq_data_cpdu_reception_window,
                { "C_PDU reception window", "s5066dts.exp_non_arq_data.cpdu_reception_window", FT_UINT16, BASE_DEC,
                        NULL, 0x0, NULL, HFILL }
            },
            { &hf_s5066dts_exp_non_arq_data_segmented_cpdu_size,
                { "Size of segmented C_PDU", "s5066dts.exp_non_arq_data.segmented_cpdu_size", FT_UINT16, BASE_DEC,
                        NULL, 0x03FF, NULL, HFILL }
            },
            /* {15, "WARNING"}, */
            { &hf_s5066dts_warning_frame_type,
                { "Received frame type", "s5066dts.warning.frame_type", FT_UINT8, BASE_DEC, NULL, 0xF0, NULL, HFILL }
            },
            { &hf_s5066dts_warning_reason,
                { "Reason warning sent", "s5066dts.warning.reason", FT_UINT8, BASE_DEC, NULL, 0x0F, NULL, HFILL }
            },
    };

    static int *ett[] = {
            &ett_s5066dts,
            &ett_s5066dts_eow,
            &ett_s5066dts_address,
            &ett_s5066dts_pdu,
            &ett_s5066dts_hftrp_token,
    };

    /* Setup protocol expert items */
    static ei_register_info ei[] = {
            { &ei_s5066dts_eow_hdr_drc_request_invalid, { "s5066dts.eow_hdr_drc_request.invalid", PI_MALFORMED, PI_ERROR,
                    "High data rate change request can only be made in Management D_PDU", EXPFILL }},
            { &ei_s5066dts_eow_hftrp_invalid, { "s5066dts.eow_hftrp.invalid", PI_MALFORMED, PI_ERROR,
                    "HFTRP tokens can only be carried with Management D_PDU", EXPFILL }},
        };

    expert_module_t* expert_s5066dts;

    if (proto_s5066dts <= 0) /* do protocol initialization only once */
    {
        proto_s5066dts = proto_register_protocol ("STANAG 5066(DTS layer)", "STANAG 5066 DTS", "s5066dts");
        proto_register_field_array(proto_s5066dts, hf, array_length(hf));
        proto_register_subtree_array(ett, array_length(ett));
        expert_s5066dts = expert_register_protocol(proto_s5066dts);
        expert_register_field_array(expert_s5066dts, ei, array_length(ei));
        s5066dts_handle = register_dissector(DISSECTOR_NAME ".raw", dissect_s5066dts_raw, proto_s5066dts);
        s5066dts_over_tcp_handle = register_dissector(DISSECTOR_NAME, dissect_s5066dts_tcp, proto_s5066dts);
    }

    s5066dts_module = prefs_register_protocol(proto_s5066dts, apply_s5066dts_prefs);

    prefs_register_bool_preference(s5066dts_module, "proto_desegment",
        "Reassemble STANAG 5066 DPDUs spanning multiple TCP segments",
        "Whether the STANAG 5066 DTS Layer dissector should reassemble DPDUs spanning multiple TCP segments",
        &config_proto_desegment);
}

/* Routine that will be called when s5066dts is handing off to the next dissector */
void proto_reg_handoff_s5066dts(void)
{
    dissector_add_uint("wtap_encap", WTAP_ENCAP_STANAG_5066_D_PDU, s5066dts_handle);
    dissector_add_for_decode_as_with_preference("tcp.port", s5066dts_over_tcp_handle);
    apply_s5066dts_prefs();
}

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */