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

/* packet-simple.c
 * Routines for SIMPLE dissection
 * Copyright 2015 Peter Ross
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/* SIMPLE (Standard Interface for Multiple Platform Link Evaluation)
 * is a protocol for exchanging tactical data link messages, such as Link 16,
 * over Internet Protocols.
 *
 * The protocol is described in STANAG 5602. See:
 * http://assistdoc1.dla.mil/qsDocDetails.aspx?ident_number=213042
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/expert.h>
#include "packet-link16.h"

void proto_reg_handoff_simple(void);

void proto_register_simple(void);

static const range_string Node_Strings[] = {
    { 1, 128, "Unicast" },
    { 129, 129, "Broadcast" },
    { 160, 168, "Multicast" },
    { 169, 169, "Adjacent" },
    { 0, 0, NULL },
};

static const value_string Subnode_Strings[] = {
    { 1, "RTT" },
    { 2, "Terminal-Host Interface" },
    { 4, "File & Mail Transfers" },
    { 5, "Open" },
    { 6, "Status & Control" },
    { 7, "Time Synchronisation" },
    { 202, "Scenario (Script)" },
    { 203, "IJMS" },
    { 204, "Link 4" },
    { 205, "Link 11" },
    { 206, "Link 16" },
    { 207, "Link 22" },
    { 208, "DIS" },
    { 209, "Voice Group A" },
    { 210, "Voice Group B" },
    { 211, "Link 11B" },
    { 0, NULL },
};

enum {
    SIMPLE_LINK16 = 1,
    SIMPLE_STATUS = 61
};

static const value_string PacketType_Strings[] = {
    { SIMPLE_LINK16, "Link 16" },
    { 2, "Link 11" },
    { 3, "Link 4" },
    { 4, "Link 22" },
    { 5, "Interim JTIDS Message Standard (IJMS)" },
    { 8, "Variable Message Format (VMF)" },
    { 10, "MIDS Terminal Specific Messages (MTSM)" },
    { 13, "MIDS/JTIDS Voice" },
    { 20, "Link 11B" },
    { 32, "DIS Protocol Data Unit (PDU)" },
    { SIMPLE_STATUS, "Status/Configuration" },
    { 62, "E-mail/File Transfer Protocol (FTP)" },
    { 63, "Round Trip Timing (RTT)" },
    { 65, "Time Synchronisation" },
    { 66, "TSA Status" },
    { 100, "National Message" },
    { 0, NULL },
};

enum {
    SIMPLE_LINK16_FIXED_FORMAT = 2
};

static const value_string Link16_Subtype_Strings[] = {
    { 0, "Uncoded Free Text" },
    { 1, "Coded Free Text" },
    { SIMPLE_LINK16_FIXED_FORMAT, "Fixed Format" },
    { 0, NULL },
};

static const range_string Link16_RC_Strings[] = {
    { 0, 0, "Not required" },
    { 1, 255, "Required" },
    { 0, 0, NULL },
};

static const value_string Status_Subtype_Strings[] = {
    { 1, "Node Status" },
    { 0, NULL },
};

static const value_string Security_Level_Strings[] = {
    { 0, "Unclassified" },
    { 1, "NATO Unclassified" },
    { 2, "Confidential" },
    { 3, "NATO Confidential" },
    { 4, "Secret" },
    { 5, "NATO Secret" },
    { 6, "National Only" },
    { 7, "Level 7" },
    { 8, "Level 8" },
    { 9, "Level 9" },
    { 0, NULL },
};

static const value_string Link16_Terminal_Type[] = {
    { 0, "None" },
    { 1, "US Navy Air (JTIDS)" },
    { 2, "US Navy Ship (JTIDS)" },
    { 3, "US F-15 (JTIDS)" },
    { 4, "US F/A-18 (MIDS)" },
    { 5, "US Army Class 2M (JTIDS)" },
    { 6, "US MCE (JTIDS)" },
    { 7, "E-3 (JTIDS)" },
    { 8, "UK Tornado F3 (JTIDS)" },
    { 9, "UK UKADGE (JTIDS)" },
    { 10, "Low Volume Terminal - Generic (MIDS)" },
    { 11, "Low Volume Terminal - Platform Type A (MIDS)" },
    { 12, "Low Volume Terminal - Platform Type B (MIDS)" },
    { 13, "Low Volume Terminal - Platform Type C (MIDS)" },
    { 14, "Low Volume Terminal - Platform Type D (MIDS)" },
    { 15, "Low Volume Terminal - Platform Type E (MIDS)" },
    { 16, "Low Volume Terminal - Platform Type F (MIDS)" },
    { 17, "Low Volume Terminal - Platform Type G (MIDS)" },
    { 18, "Low Volume Terminal 2, US Army (MIDS)" },
    { 19, "Low Volume Terminal MIDS on Ship (MOS) (MIDS)" },
    { 20, "US Fighter Data Link (FDL) (MIDS)" },
    { 21, "AN/URC-138" },
    { 22, "Low Volume Terminal Platform Type H (MIDS)" },
    { 23, "Low Volume Terminal Platform Type I (MIDS)" },
    { 0, NULL },
};

static const value_string Link16_Role[] = {
    { 0, "None" },
    { 1, "SIMPLE Host (SH)" },
    { 2, "SIMPLE Terminal Emulator (STE)" },
    { 3, "SIMPLE Network Monitor (SNM)" },
    { 4, "SIMPLE Virtual Host (SVH)" },
    { 5, "SIMPLE Virtual Terminal (SVT)" },
    { 0, NULL },
};

static const value_string Link16_Sync_Status[] = {
    { 0, "None" },
    { 1, "Net Entry in Progress" },
    { 2, "Coarse Sync" },
    { 3, "Fine Sync" },
    { 0, NULL },
};

static const value_string Link_Terminal_Host_Status[] = {
    { 0, "Inactive" },
    { 1, "Active" },
    { 0, NULL },
};

static const value_string Link11_DTS_Type[] = {
    { 0, "None" },
    { 1, "MIL-STD-1397 parallel" },
    { 2, "MIL-STD-188-203-1A serial" },
    { 0, NULL },
};

static const value_string Link11_Role[] = {
    { 0, "None"},
    { 1, "SIMPLE DTS EMULATOR (SDE) Picket"},
    { 2, "SDE Net Control Station (NCS)" },
    { 3, "SIMPLE Participating Unit (PU) Emulator (SPE)" },
    { 0, NULL },
};

static int proto_simple = -1;

static dissector_handle_t link16_handle;

static gint hf_simple_sync_byte_1 = -1;
static gint hf_simple_sync_byte_2 = -1;
static gint hf_simple_length = -1;
static gint hf_simple_sequence_number = -1;
static gint hf_simple_src_node = -1;
static gint hf_simple_src_subnode = -1;
static gint hf_simple_dst_node = -1;
static gint hf_simple_dst_subnode = -1;
static gint hf_simple_packet_size = -1;
static gint hf_simple_packet_type = -1;
static gint hf_simple_transit_time = -1;
static gint hf_simple_link16_subtype = -1;
static gint hf_simple_link16_rc = -1;
static gint hf_simple_link16_network = -1;
static gint hf_simple_link16_ssc2 = -1;
static gint hf_simple_link16_npg = -1;
static gint hf_simple_link16_ssc1 = -1;
static gint hf_simple_link16_stn = -1;
static gint hf_simple_link16_word_count = -1;
static gint hf_simple_link16_loopback_id = -1;
static gint hf_simple_status_subtype = -1;
static gint hf_simple_status_word_count = -1;
static gint hf_simple_status_name = -1;
static gint hf_simple_status_time_hours = -1;
static gint hf_simple_status_node_id = -1;
static gint hf_simple_status_time_seconds = -1;
static gint hf_simple_status_time_minutes = -1;
static gint hf_simple_status_security_level = -1;
static gint hf_simple_status_node_entry_flag = -1;
static gint hf_simple_status_relay_hop = -1;
static gint hf_simple_status_dx_flag_system_messages = -1;
static gint hf_simple_status_dx_flag_common_tims_bims = -1;
static gint hf_simple_status_dx_flag_common_toms_boms = -1;
static gint hf_simple_status_dx_flag_simple_receive = -1;
static gint hf_simple_status_dx_flag_simple_transmit = -1;
static gint hf_simple_status_dx_flag_all_tims_bims = -1;
static gint hf_simple_status_dx_flag_all_toms_boms = -1;
static gint hf_simple_status_dx_file_id = -1;
static gint hf_simple_status_spare_1 = -1;
static gint hf_simple_status_link16_terminal_type = -1;
static gint hf_simple_status_link16_role = -1;
static gint hf_simple_status_link16_sync_status = -1;
static gint hf_simple_status_link16_terminal_host_status = -1;
static gint hf_simple_status_link16_stn = -1;
static gint hf_simple_status_spare_2 = -1;
static gint hf_simple_status_link11_dts_type = -1;
static gint hf_simple_status_link11_role = -1;
static gint hf_simple_status_link11_pu = -1;
static gint hf_simple_status_link11_dts_host_status = -1;
static gint hf_simple_status_spare_3 = -1;
static gint hf_simple_checksum = -1;
static gint hf_simple_checksum_bad = -1;

static gint ett_simple = -1;
static gint ett_packet = -1;
static gint ett_simple_status_dx_flag = -1;

static expert_field ei_simple_sync_bytes_bad = EI_INIT;
static expert_field ei_simple_length_bad = EI_INIT;
static expert_field ei_simple_packet_size_bad = EI_INIT;
static expert_field ei_simple_checksum_bad = EI_INIT;

static void dissect_simple_link16(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset)
{
    guint subtype, stn, word_count, i;
    Link16State state;
    tvbuff_t *newtvb;

    proto_tree_add_item(tree, hf_simple_link16_subtype, tvb, offset, 1, ENC_NA);
    subtype = tvb_get_guint8(tvb, offset);
    offset++;

    proto_tree_add_item(tree, hf_simple_link16_rc, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_link16_network, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_link16_ssc2, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_link16_npg, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    proto_tree_add_item(tree, hf_simple_link16_ssc1, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    proto_tree_add_item(tree, hf_simple_link16_stn, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    stn = tvb_get_letohs(tvb, offset);
    offset += 2;

    proto_tree_add_item(tree, hf_simple_link16_word_count, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    word_count = tvb_get_guint8(tvb, offset);
    offset += 2;

    proto_tree_add_item(tree, hf_simple_link16_loopback_id, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    col_append_fstr(pinfo->cinfo, COL_INFO, ", STN: %05o, Words:", stn);

    switch(subtype) {
    case SIMPLE_LINK16_FIXED_FORMAT:
        memset(&state, 0, sizeof(state));
        for (i = 0; i < word_count; i += 5) {
            newtvb = tvb_new_subset(tvb, offset, 10, -1);
            add_new_data_source(pinfo, newtvb, "Link 16 Word");
            call_dissector_with_data(link16_handle, newtvb, pinfo, tree, &state);
            offset += 10;
        }
        break;
    }
}

static const int *simple_status_dx_flag_fields[] = {
    &hf_simple_status_dx_flag_system_messages,
    &hf_simple_status_dx_flag_common_tims_bims,
    &hf_simple_status_dx_flag_common_toms_boms,
    &hf_simple_status_dx_flag_simple_receive,
    &hf_simple_status_dx_flag_simple_transmit,
    &hf_simple_status_dx_flag_all_tims_bims,
    &hf_simple_status_dx_flag_all_toms_boms,
    NULL
};

#define SIMPLE_STATUS_NAME_LEN 10

static void dissect_simple_status(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint offset)
{
    char *name;
    int link16_status, pu;

    proto_tree_add_item(tree, hf_simple_status_subtype, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_word_count, tvb, offset, 1, ENC_NA);
    offset++;

    name = tvb_get_stringzpad(wmem_packet_scope(), tvb, offset, SIMPLE_STATUS_NAME_LEN, ENC_ASCII|ENC_NA);
    col_append_fstr(pinfo->cinfo, COL_INFO, ", Name: %s", name);
    proto_tree_add_item(tree, hf_simple_status_name, tvb, offset, SIMPLE_STATUS_NAME_LEN, ENC_ASCII|ENC_NA);
    offset += SIMPLE_STATUS_NAME_LEN;

    proto_tree_add_item(tree, hf_simple_status_time_hours, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_node_id, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_time_seconds, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_time_minutes, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_security_level, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_node_entry_flag, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_relay_hop, tvb, offset, 16, ENC_NA);
    offset += 16;

    proto_tree_add_bitmask_text(tree, tvb, offset, 2, "Data Extraction Flags", NULL, ett_simple_status_dx_flag, simple_status_dx_flag_fields, ENC_LITTLE_ENDIAN, 0);
    offset += 2;

    proto_tree_add_item(tree, hf_simple_status_dx_file_id, tvb, offset, 8, ENC_ASCII|ENC_NA);
    offset += 8;

    proto_tree_add_item(tree, hf_simple_status_spare_1, tvb, offset, 2, ENC_NA);
    offset += 2;

    proto_tree_add_item(tree, hf_simple_status_link16_terminal_type, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_link16_role, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_link16_sync_status, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_link16_terminal_host_status, tvb, offset, 1, ENC_NA);
    link16_status = tvb_get_guint8(tvb, offset);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_link16_stn, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    if (link16_status)
        col_append_fstr(pinfo->cinfo, COL_INFO, ", STN: %05o", tvb_get_letohs(tvb, offset));
    offset += 2;

    proto_tree_add_item(tree, hf_simple_status_spare_2, tvb, offset, 2, ENC_NA);
    offset += 2;

    proto_tree_add_item(tree, hf_simple_status_link11_dts_type, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_link11_role, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_link11_pu, tvb, offset, 1, ENC_NA);
    pu = tvb_get_guint8(tvb, offset);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_link11_dts_host_status, tvb, offset, 1, ENC_NA);
    if (tvb_get_guint8(tvb, offset))
        col_append_fstr(pinfo->cinfo, COL_INFO, ", PU: %03o", pu);
    offset++;

    proto_tree_add_item(tree, hf_simple_status_spare_3, tvb, offset, 4, ENC_NA);
}

static void dissect_checksum(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint offset)
{
    gint checksum = tvb_get_letohs(tvb, offset);
    proto_item *checksum_item = proto_tree_add_item(tree, hf_simple_checksum, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_item *hidden_item;

    const guint8 * v = tvb_get_ptr(tvb, 0, offset);
    guint16 expected_checksum = 0;
    gint i;

    for (i = 0; i < offset; i++)
        expected_checksum += v[i];

    if (checksum == expected_checksum) {
        hidden_item = proto_tree_add_boolean(tree, hf_simple_checksum_bad, tvb, offset, 2, FALSE);
        PROTO_ITEM_SET_HIDDEN(hidden_item);
        proto_item_append_text(checksum_item, " [correct]");
    } else {
        hidden_item = proto_tree_add_boolean(tree, hf_simple_checksum_bad, tvb, offset, 2, TRUE);
        PROTO_ITEM_SET_HIDDEN(hidden_item);
        proto_item_append_text(checksum_item, " [incorrect, should be 0x%04x]", expected_checksum);
        expert_add_info_format(pinfo, checksum_item, &ei_simple_checksum_bad,
                               "SIMPLE Checksum Incorrect, should be 0x%04x", expected_checksum);
    }
}

static int dissect_simple(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
    proto_item *simple_item = NULL, *item;
    proto_tree *simple_tree = NULL, *packet_tree = NULL;
    guint offset = 0, length, packet_size, packet_type;
    const gchar *packet_type_string;
    guint8 sync_bytes_bad = 0;

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

    if (tree) {
        simple_item = proto_tree_add_item(tree, proto_simple, tvb, 0, -1, ENC_NA);
        simple_tree = proto_item_add_subtree(simple_item, ett_simple);
    }

    proto_tree_add_item(simple_tree, hf_simple_sync_byte_1, tvb, offset, 1, ENC_NA);
    sync_bytes_bad |= tvb_get_guint8(tvb, offset) ^ 0x49;
    offset++;

    proto_tree_add_item(simple_tree, hf_simple_sync_byte_2, tvb, offset, 1, ENC_NA);
    sync_bytes_bad |= tvb_get_guint8(tvb, offset) ^ 0x36;
    offset++;

    if (sync_bytes_bad)
        expert_add_info(pinfo, simple_item, &ei_simple_sync_bytes_bad);

    item = proto_tree_add_item(simple_tree, hf_simple_length, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    length = tvb_get_letohs(tvb, offset);
    offset += 2;

    if (length < 16 || length >= 518 || length > tvb_reported_length(tvb))
        expert_add_info(pinfo, item, &ei_simple_length_bad);

    proto_tree_add_item(simple_tree, hf_simple_sequence_number, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    proto_tree_add_item(simple_tree, hf_simple_src_node, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(simple_tree, hf_simple_src_subnode, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(simple_tree, hf_simple_dst_node, tvb, offset, 1, ENC_NA);
    offset++;

    proto_tree_add_item(simple_tree, hf_simple_dst_subnode, tvb, offset, 1, ENC_NA);
    offset++;

    item = proto_tree_add_item(simple_tree, hf_simple_packet_size, tvb, offset, 1, ENC_NA);
    packet_size = tvb_get_guint8(tvb, offset) * 2;
    if (packet_size < 8 || packet_size - 8 > tvb_reported_length(tvb))
        expert_add_info(pinfo, item, &ei_simple_packet_size_bad);
    packet_size -= 8;
    offset++;

    proto_tree_add_item(simple_tree, hf_simple_packet_type, tvb, offset, 1, ENC_NA);
    packet_type = tvb_get_guint8(tvb, offset);
    offset++;

    proto_tree_add_item(simple_tree, hf_simple_transit_time, tvb, offset, 2, ENC_LITTLE_ENDIAN);
    offset += 2;

    packet_type_string = val_to_str(packet_type, PacketType_Strings, "Unknown");
    col_add_fstr(pinfo->cinfo, COL_INFO, "%s", packet_type_string);
    packet_tree = proto_tree_add_subtree_format(simple_tree, tvb, offset, packet_size, ett_packet, NULL, "%s Packet", packet_type_string);

    switch(packet_type) {
    case SIMPLE_LINK16:
        dissect_simple_link16(tvb, pinfo, packet_tree, offset);
        break;
    case SIMPLE_STATUS:
        dissect_simple_status(tvb, pinfo, packet_tree, offset);
        break;
    }

    dissect_checksum(tvb, pinfo, simple_tree, length - 2);

    return tvb_captured_length(tvb);
}

void proto_register_simple(void)
{
    static hf_register_info hf[] = {
        { &hf_simple_sync_byte_1,
          { "Sync Byte 1", "simple.sync_byte_1", FT_UINT8, BASE_HEX, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_sync_byte_2,
          { "Sync Byte 2", "simple.sync_byte_2", FT_UINT8, BASE_HEX, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_length,
          { "Length", "simple.length", FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_sequence_number,
          { "Sequence Number", "simple.sequence_number", FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_src_node,
          { "Source Node", "simple.src_node", FT_UINT8, BASE_RANGE_STRING | BASE_DEC, RVALS(Node_Strings), 0x0,
            NULL, HFILL }},
        { &hf_simple_src_subnode,
          { "Source Subnode", "simple.src_subnode", FT_UINT8, BASE_DEC, VALS(Subnode_Strings), 0x0,
            NULL, HFILL }},
        { &hf_simple_dst_node,
          { "Destination Node", "simple.dst_node", FT_UINT8, BASE_RANGE_STRING | BASE_DEC, RVALS(Node_Strings), 0x0,
            NULL, HFILL }},
        { &hf_simple_dst_subnode,
          { "Destination Subnode", "simple.dst_subnode", FT_UINT8, BASE_DEC, VALS(Subnode_Strings), 0x0,
            NULL, HFILL }},
        { &hf_simple_packet_size,
          { "Packet Size", "simple.packet_size", FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_packet_type,
          { "Packet Type", "simple.packet_type", FT_UINT8, BASE_DEC, VALS(PacketType_Strings), 0x0,
            NULL, HFILL }},
        { &hf_simple_transit_time,
          { "Transit Time", "simple.transit_time", FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_link16_subtype,
          { "Subtype", "simple.link16.subtype", FT_UINT8, BASE_DEC, VALS(Link16_Subtype_Strings), 0x0,
            NULL, HFILL }},
        { &hf_simple_link16_rc,
          { "R/C Flag", "simple.link16.rc", FT_UINT8, BASE_DEC, VALS(Link16_RC_Strings), 0x0,
            NULL, HFILL }},
        { &hf_simple_link16_network,
          { "Network", "simple.link16.network", FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_link16_ssc2,
          { "Sequential Slot Count 2", "simple.link16.ssc2", FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_link16_npg,
          { "NPG Number", "simple.link16.npg", FT_UINT16, BASE_DEC, VALS(Link16_NPG_Strings), 0x0,
            NULL, HFILL }},
        { &hf_simple_link16_ssc1,
          { "Sequential Slot Count 1", "simple.link16.ssc1", FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_link16_stn,
          { "Source Track Number", "simple.link16.stn", FT_UINT16, BASE_OCT, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_link16_word_count,
          { "Word Count", "simple.link16.word_count", FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_link16_loopback_id,
          { "Loopback ID", "simple.link16.loopback_id", FT_UINT16, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_subtype,
          { "Subtype", "simple.status.subtype", FT_UINT8, BASE_HEX, VALS(Status_Subtype_Strings), 0x0,
            NULL, HFILL }},
        { &hf_simple_status_word_count,
          { "Word Count", "simple.status.word_count", FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_name,
          { "Name", "simple.status.name", FT_STRING, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_time_hours,
          { "Time (Hours)", "simple.status.time_hours", FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_node_id,
          { "Node Id", "simple.status.node_id", FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_time_seconds,
          { "Time (Seconds)", "simple.status.time_seconds", FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_time_minutes,
          { "Time (Minutes)", "simple.status.time_minutes", FT_UINT8, BASE_DEC, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_security_level,
          { "Security Level", "simple.status.security_level", FT_UINT8, BASE_DEC, VALS(Security_Level_Strings), 0x0,
            NULL, HFILL }},
        { &hf_simple_status_node_entry_flag,
          { "Node Entry Flag", "simple.status.node_entry_flag", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_relay_hop,
          { "Relay Hop", "simple.status.relay_hop", FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_dx_flag_system_messages,
          { "DX System Messages", "simple.status.dx_flag.system_messages", FT_BOOLEAN, 16, NULL, 0x1,
            NULL, HFILL }},
        { &hf_simple_status_dx_flag_common_tims_bims,
          { "DX Common TIMS/BIMS", "simple.status.dx_flag.common_tims_bims", FT_BOOLEAN, 16, NULL, 0x2,
            NULL, HFILL }},
        { &hf_simple_status_dx_flag_common_toms_boms,
          { "DX Common TOMS/BOMS", "simple.status.dx_flag.common_toms_boms", FT_BOOLEAN, 16, NULL, 0x4,
            NULL, HFILL }},
        { &hf_simple_status_dx_flag_simple_receive,
          { "DX SIMPLE Recieve", "simple.status.dx_flag.simple_receive", FT_BOOLEAN, 16, NULL, 0x8,
            NULL, HFILL }},
        { &hf_simple_status_dx_flag_simple_transmit,
          { "DX SIMPLE Transmit", "simple.status.dx_flag.simple_transmit", FT_BOOLEAN, 16, NULL, 0x10,
            NULL, HFILL }},
        { &hf_simple_status_dx_flag_all_tims_bims,
          { "DX All TIMS/BIMS", "simple.status.dx_flag.all_tims_bims", FT_BOOLEAN, 16, NULL, 0x20,
            NULL, HFILL }},
        { &hf_simple_status_dx_flag_all_toms_boms,
          { "DX All TOMS/BOMS", "simple.status.dx_flag.all_toms_boms", FT_BOOLEAN, 16, NULL, 0x40,
            NULL, HFILL }},
        { &hf_simple_status_dx_file_id,
          { "DX File Id", "simple.status.dx_file_id", FT_STRING, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_spare_1,
          { "Spare1", "simple.status.spare_1", FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_link16_terminal_type,
          { "Link 16 Type", "simple.status.link16.terminal_type", FT_UINT8, BASE_DEC, VALS(Link16_Terminal_Type), 0x0,
            NULL, HFILL }},
        { &hf_simple_status_link16_role,
          { "Link 16 Role", "simple.status.link16.role", FT_UINT8, BASE_DEC, VALS(Link16_Role), 0x0,
            NULL, HFILL }},
        { &hf_simple_status_link16_sync_status,
          { "Link 16 Sync Status", "simple.status.link16.sync_status", FT_UINT8, BASE_DEC, VALS(Link16_Sync_Status), 0x0,
            NULL, HFILL }},
        { &hf_simple_status_link16_terminal_host_status,
          { "Link 16 Terminal/Host Status", "simple.status.link16.terminal_host_status", FT_UINT8, BASE_DEC, VALS(Link_Terminal_Host_Status), 0x0,
            NULL, HFILL }},
        { &hf_simple_status_link16_stn,
          { "Link 16 STN", "simple.status.link16.stn", FT_UINT16, BASE_OCT, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_spare_2,
          { "Spare2", "simple.status.spare_2", FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_link11_dts_type,
          { "Link 11 DTS Type", "simple.status.link11.dts_type", FT_UINT8, BASE_DEC, VALS(Link11_DTS_Type), 0x0,
            NULL, HFILL }},
        { &hf_simple_status_link11_role,
          { "Link 11 Role", "simple.status.link11.role", FT_UINT8, BASE_DEC, VALS(Link11_Role), 0x0,
            NULL, HFILL }},
        { &hf_simple_status_link11_pu,
          { "Link 11 PU", "simple.status.link11.pu", FT_UINT8, BASE_OCT, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_status_link11_dts_host_status,
          { "Link 11 DTS/Host Status", "simple.status.link11.dts_host_status", FT_UINT8, BASE_DEC, VALS(Link_Terminal_Host_Status), 0x0,
            NULL, HFILL }},
        { &hf_simple_status_spare_3,
          { "Spare3", "simple.status.spare_3", FT_BYTES, BASE_NONE, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_checksum,
          { "Checksum", "simple.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
            NULL, HFILL }},
        { &hf_simple_checksum_bad,
          { "Bad Checksum", "simple.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
            NULL, HFILL }}
    };
    static gint *ett[] = {
        &ett_simple,
        &ett_packet,
        &ett_simple_status_dx_flag,
    };
    static ei_register_info ei[] = {
        { &ei_simple_sync_bytes_bad, { "simple.sync_bytes.bad", PI_MALFORMED, PI_ERROR, "Bad sync bytes", EXPFILL }},
        { &ei_simple_length_bad, { "simple.length.bad", PI_MALFORMED, PI_ERROR, "Bad length", EXPFILL }},
        { &ei_simple_packet_size_bad, { "simple.packet_size.bad", PI_MALFORMED, PI_ERROR, "Bad packet length", EXPFILL }},
        { &ei_simple_checksum_bad, { "simple.checksum.bad.expert", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }},
    };
    expert_module_t* expert_simple;

    proto_simple = proto_register_protocol("Standard Interface for Multiple Platform Link Evaluation", "SIMPLE", "simple");
    proto_register_field_array(proto_simple, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
    expert_simple = expert_register_protocol(proto_simple);
    expert_register_field_array(expert_simple, ei, array_length(ei));
    register_dissector("simple", dissect_simple, proto_simple);
}

void proto_reg_handoff_simple(void)
{
    dissector_handle_t simple_dissector_handle;
    simple_dissector_handle = create_dissector_handle(dissect_simple, proto_simple);
    dissector_add_for_decode_as("udp.port", simple_dissector_handle);

    link16_handle = find_dissector_add_dependency("link16", proto_simple);
}

/*
 * Editor modelines  -  http://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:
 */