224 lines
7.5 KiB
C
224 lines
7.5 KiB
C
/* packet-dvb-data-mpe.c
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* Routines for DVB-DATA (ETSI EN 301 192) MultiProtocol Encapsulation
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* Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/to_str.h>
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#include "packet-mpeg-sect.h"
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void proto_register_dvb_data_mpe(void);
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void proto_reg_handoff_dvb_data_mpe(void);
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static int proto_dvb_data_mpe = -1;
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static int hf_dvb_data_mpe_reserved = -1;
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static int hf_dvb_data_mpe_payload_scrambling_control = -1;
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static int hf_dvb_data_mpe_address_scrambling_control = -1;
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static int hf_dvb_data_mpe_llc_snap_flag = -1;
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static int hf_dvb_data_mpe_current_next_indicator = -1;
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static int hf_dvb_data_mpe_section_number = -1;
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static int hf_dvb_data_mpe_last_section_number = -1;
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static int hf_dvb_data_mpe_dst_mac = -1;
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static gint ett_dvb_data_mpe = -1;
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static dissector_handle_t ip_handle;
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static dissector_handle_t llc_handle;
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#define DVB_DATA_MPE_RESERVED_MASK 0xC0
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#define DVB_DATA_MPE_PAYLOAD_SCRAMBLING_MASK 0x30
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#define DVB_DATA_MPE_ADDRESS_SCRAMBLING_MASK 0x0C
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#define DVB_DATA_MPE_LLC_SNAP_FLAG_MASK 0x02
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#define DVB_DATA_MPE_CURRENT_NEXT_INDICATOR_MASK 0x01
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static const value_string dvb_rcs_cur_next_vals[] = {
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{ 0x0, "Not yet applicable" },
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{ 0x1, "Currently applicable" },
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{ 0, NULL },
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};
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static int
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dissect_dvb_data_mpe(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint offset = 0, tot_len = 0;
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guint8 llc_snap_flag;
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int i;
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proto_item *ti;
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proto_tree *dvb_data_mpe_tree;
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tvbuff_t *mac_tvb;
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tvbuff_t *mac_bytes_tvb[6];
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tvbuff_t *data_tvb;
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/* The TVB should start right after the section_length in the Section packet */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "DVB-DATA");
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col_set_str(pinfo->cinfo, COL_INFO, "MultiProtocol Encapsulation");
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ti = proto_tree_add_item(tree, proto_dvb_data_mpe, tvb, offset, -1, ENC_NA);
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dvb_data_mpe_tree = proto_item_add_subtree(ti, ett_dvb_data_mpe);
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offset += packet_mpeg_sect_header(tvb, offset, dvb_data_mpe_tree, &tot_len, NULL);
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/* Parse the DMC-CC private section header */
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mac_bytes_tvb[5] = tvb_new_subset_length(tvb, offset, 1);
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offset += 1;
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mac_bytes_tvb[4] = tvb_new_subset_length(tvb, offset, 1);
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offset += 1;
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proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_payload_scrambling_control, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_address_scrambling_control, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_llc_snap_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
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llc_snap_flag = tvb_get_guint8(tvb, offset) & DVB_DATA_MPE_LLC_SNAP_FLAG_MASK;
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offset += 1;
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proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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for (i = 3; i >= 0; i--) {
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mac_bytes_tvb[i] = tvb_new_subset_length(tvb, offset, 1);
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offset += 1;
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}
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mac_tvb = tvb_new_composite();
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for (i = 0; i < 6; i++)
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tvb_composite_append(mac_tvb, mac_bytes_tvb[i]);
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tvb_composite_finalize(mac_tvb);
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proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_dst_mac, mac_tvb, 0 , 6, ENC_NA);
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col_add_str(pinfo->cinfo, COL_RES_DL_DST, tvb_ether_to_str(mac_tvb, 0));
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data_tvb = tvb_new_subset_remaining(tvb, offset);
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if (llc_snap_flag) {
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call_dissector(llc_handle, data_tvb, pinfo, tree);
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} else {
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call_dissector(ip_handle, data_tvb, pinfo, tree);
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}
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packet_mpeg_sect_crc(tvb, pinfo, dvb_data_mpe_tree, 0, tot_len - 1);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_dvb_data_mpe(void)
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{
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static hf_register_info hf[] = {
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/* DSM-CC common fields */
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{ &hf_dvb_data_mpe_reserved, {
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"Reserved", "dvb_data_mpe.reserved",
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FT_UINT8, BASE_HEX, NULL, DVB_DATA_MPE_RESERVED_MASK, NULL, HFILL
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} },
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{ &hf_dvb_data_mpe_payload_scrambling_control, {
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"Payload Scrambling Control", "dvb_data_mpe.pload_scrambling",
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FT_UINT8, BASE_HEX, NULL, DVB_DATA_MPE_PAYLOAD_SCRAMBLING_MASK, NULL, HFILL
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} },
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{ &hf_dvb_data_mpe_address_scrambling_control, {
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"Address Scrambling Control", "dvb_data_mpe.addr_scrambling",
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FT_UINT8, BASE_HEX, NULL, DVB_DATA_MPE_ADDRESS_SCRAMBLING_MASK, NULL, HFILL
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} },
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{ &hf_dvb_data_mpe_llc_snap_flag, {
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"LLC SNAP Flag", "dvb_data_mpe.llc_snap_flag",
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FT_UINT8, BASE_HEX, NULL, DVB_DATA_MPE_LLC_SNAP_FLAG_MASK, NULL, HFILL
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} },
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{ &hf_dvb_data_mpe_current_next_indicator, {
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"Current/Next Indicator", "mpeg_sect.cur_next_ind",
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FT_UINT8, BASE_HEX, VALS(dvb_rcs_cur_next_vals), DVB_DATA_MPE_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
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} },
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{ &hf_dvb_data_mpe_section_number, {
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"Section Number", "dvb_data_mpe.sect_num",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
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} },
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{ &hf_dvb_data_mpe_last_section_number, {
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"Last Section Number", "dvb_data_mpe.last_sect_num",
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FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
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} },
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{ &hf_dvb_data_mpe_dst_mac, {
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"Destination MAC address", "dvb_data_mpe.dst_mac",
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FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL
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} },
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};
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static gint *ett[] = {
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&ett_dvb_data_mpe,
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};
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proto_dvb_data_mpe = proto_register_protocol("DVB-DATA MultiProtocol Encapsulation", "DVB-DATA MPE", "dvb_data_mpe");
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proto_register_field_array(proto_dvb_data_mpe, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_dvb_data_mpe(void)
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{
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dissector_handle_t dvb_data_mpe_handle;
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dvb_data_mpe_handle = create_dissector_handle(dissect_dvb_data_mpe, proto_dvb_data_mpe);
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dissector_add_uint("mpeg_sect.tid", DVB_DATA_MPE_TID, dvb_data_mpe_handle);
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ip_handle = find_dissector_add_dependency("ip", proto_dvb_data_mpe);
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llc_handle = find_dissector_add_dependency("llc", proto_dvb_data_mpe);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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