/* packet-bicc_mst.c

 * (Incomplete) Dissector for the 3GPP TS 29.205 BICC MST (Mobile Service Transport)

 *

 * This currently only dissects a single MST IE, which is required by the BSSMAP

 * dissector in order to decode the LCLS (Local Call Local Switch)

 * GCR (Global Call Reference)

 *

 * Copyright 2019 by Harald Welte <laforge@gnumonks.org>

 *

 * 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/tap.h>

#include <epan/expert.h>

#include "packet-bicc_mst.h"

void proto_register_bicc_mst(void);

static int proto_bicc_mst;

static int hf_lcls_gcr_network_id_len;

static int hf_lcls_gcr_network_id;

static int hf_lcls_gcr_node_id_len;

static int hf_lcls_gcr_node_id;

static int hf_lcls_gcr_call_ref_id_len;

static int hf_lcls_gcr_call_ref_id;

static int ett_lcls_gcr;

unsigned

dissect_bicc_mst_lcls_gcr(tvbuff_t *tvb, proto_tree *tree, uint32_t offset, unsigned len)

{

  unsigned net_id_len, node_id_len, call_ref_id_len;

  uint32_t curr_offset = offset;

  proto_tree *subtree;

  proto_item *ti;

  ti = proto_tree_add_protocol_format(tree, proto_bicc_mst, tvb, offset, len, "BICC MST GCR");

  subtree = proto_item_add_subtree(ti, ett_lcls_gcr);

  proto_tree_add_item_ret_uint(subtree, hf_lcls_gcr_network_id_len, tvb, curr_offset++, 1, ENC_NA, &net_id_len);

  proto_tree_add_item(subtree, hf_lcls_gcr_network_id, tvb, curr_offset, net_id_len, ENC_NA);

  curr_offset += net_id_len;

  proto_tree_add_item_ret_uint(subtree, hf_lcls_gcr_node_id_len, tvb, curr_offset++, 1, ENC_NA, &node_id_len);

  proto_tree_add_item(subtree, hf_lcls_gcr_node_id, tvb, curr_offset, node_id_len, ENC_NA);

  curr_offset += node_id_len;

  proto_tree_add_item_ret_uint(subtree, hf_lcls_gcr_call_ref_id_len, tvb, curr_offset++, 1, ENC_NA, &call_ref_id_len);

  proto_tree_add_item(subtree, hf_lcls_gcr_call_ref_id, tvb, curr_offset, call_ref_id_len, ENC_NA);

  curr_offset += call_ref_id_len;

  return curr_offset - offset;

}

void

proto_register_bicc_mst(void)

{

  static hf_register_info hf[] = {

    { &hf_lcls_gcr_network_id_len, { "Length of LCLS GCR Network ID",

      "bicc_mst.lcls_gcr.network_id_len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},

    { &hf_lcls_gcr_network_id, { "LCLS GCR Network ID",

      "bicc_mst.lcls_gcr.network_id", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},

    { &hf_lcls_gcr_node_id_len, { "Length of LCLS GCR Node ID",

      "bicc_mst.lcls_gcr.node_id_len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},

    { &hf_lcls_gcr_node_id, { "LCLS GCR Network ID",

      "bicc_mst.lcls_gcr.network_id", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},

    { &hf_lcls_gcr_call_ref_id_len, { "Length of LCLS GCR Call Ref ID",

      "bicc_mst.lcls_gcr.call_ref_id_len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},

    { &hf_lcls_gcr_call_ref_id, { "LCLS GCR Call Ref ID",

      "bicc_mst.lcls_gcr.call_ref_id", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},

  };

  static int *ett[] = {

    &ett_lcls_gcr,

  };

  proto_bicc_mst = proto_register_protocol("3GPP BICC MST", "BICC-MST", "bicc_mst");

  proto_register_field_array(proto_bicc_mst, hf, array_length(hf));

  proto_register_subtree_array(ett, array_length(ett));

}

/*

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

 *

 * Local variables:

 * c-basic-offset: 8

 * tab-width: 8

 * indent-tabs-mode: t

 * End:

 *

 * vi: set shiftwidth=8 tabstop=8 noexpandtab:

 * :indentSize=8:tabSize=8:noTabs=false:

 */