epan/dissectors/packet-dvb-data-mpe.c

   1 /* packet-dvb-data-mpe.c
   2  * Routines for DVB-DATA (ETSI EN 301 192) MultiProtocol Encapsulation
   3  * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <glib.h>
  29
  30 #include <epan/packet.h>
  31 #include <epan/to_str.h>
  32 #include <epan/dissectors/packet-mpeg-sect.h>
  33
  34 void proto_register_dvb_data_mpe(void);
  35 void proto_reg_handoff_dvb_data_mpe(void);
  36
  37 static int proto_dvb_data_mpe = -1;
  38 static int hf_dvb_data_mpe_reserved = -1;
  39 static int hf_dvb_data_mpe_payload_scrambling_control = -1;
  40 static int hf_dvb_data_mpe_address_scrambling_control = -1;
  41 static int hf_dvb_data_mpe_llc_snap_flag = -1;
  42 static int hf_dvb_data_mpe_current_next_indicator = -1;
  43 static int hf_dvb_data_mpe_section_number = -1;
  44 static int hf_dvb_data_mpe_last_section_number = -1;
  45 static int hf_dvb_data_mpe_dst_mac = -1;
  46
  47 static gint ett_dvb_data_mpe = -1;
  48
  49 static dissector_handle_t ip_handle;
  50 static dissector_handle_t llc_handle;
  51
  52 #define DVB_DATA_MPE_TID    0x3E
  53
  54
  55 #define DVB_DATA_MPE_RESERVED_MASK                0xC0
  56 #define DVB_DATA_MPE_PAYLOAD_SCRAMBLING_MASK      0x30
  57 #define DVB_DATA_MPE_ADDRESS_SCRAMBLING_MASK      0x0C
  58 #define DVB_DATA_MPE_LLC_SNAP_FLAG_MASK           0x02
  59 #define DVB_DATA_MPE_CURRENT_NEXT_INDICATOR_MASK  0x01
  60
  61 static const value_string dvb_rcs_cur_next_vals[] = {
  62
  63     { 0x0, "Not yet applicable" },
  64     { 0x1, "Currently applicable" },
  65     { 0, NULL },
  66
  67 };
  68
  69
  70 static void
  71 dissect_dvb_data_mpe(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  72 {
  73
  74     guint       offset = 0, tot_len = 0;
  75     guint8      llc_snap_flag;
  76     int         i;
  77
  78     proto_item *ti;
  79     proto_tree *dvb_data_mpe_tree;
  80     tvbuff_t   *mac_tvb;
  81     tvbuff_t   *mac_bytes_tvb[6];
  82     tvbuff_t   *data_tvb;
  83
  84     /* The TVB should start right after the section_length in the Section packet */
  85
  86     col_set_str(pinfo->cinfo, COL_PROTOCOL, "DVB-DATA");
  87     col_set_str(pinfo->cinfo, COL_INFO, "MultiProtocol Encapsulation");
  88
  89     ti = proto_tree_add_item(tree, proto_dvb_data_mpe, tvb, offset, -1, ENC_NA);
  90     dvb_data_mpe_tree = proto_item_add_subtree(ti, ett_dvb_data_mpe);
  91
  92     offset += packet_mpeg_sect_header(tvb, offset, dvb_data_mpe_tree, &tot_len, NULL);
  93
  94
  95     /* Parse the DMC-CC private section header */
  96
  97     mac_bytes_tvb[5] = tvb_new_subset(tvb, offset, 1, 1);
  98     offset += 1;
  99     mac_bytes_tvb[4] = tvb_new_subset(tvb, offset, 1, 1);
 100     offset += 1;
 101
 102     proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_reserved,                               tvb, offset, 1, ENC_BIG_ENDIAN);
 103     proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_payload_scrambling_control, tvb, offset, 1, ENC_BIG_ENDIAN);
 104     proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_address_scrambling_control, tvb, offset, 1, ENC_BIG_ENDIAN);
 105     proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_llc_snap_flag,                          tvb, offset, 1, ENC_BIG_ENDIAN);
 106     proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_current_next_indicator,         tvb, offset, 1, ENC_BIG_ENDIAN);
 107     llc_snap_flag = tvb_get_guint8(tvb, offset) & DVB_DATA_MPE_LLC_SNAP_FLAG_MASK;
 108     offset += 1;
 109
 110     proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_section_number,                         tvb, offset, 1, ENC_BIG_ENDIAN);
 111     offset += 1;
 112
 113     proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_last_section_number,            tvb, offset, 1, ENC_BIG_ENDIAN);
 114     offset += 1;
 115
 116     for (i = 3; i >= 0; i--) {
 117         mac_bytes_tvb[i] = tvb_new_subset(tvb, offset, 1, 1);
 118         offset += 1;
 119     }
 120
 121     mac_tvb = tvb_new_composite();
 122
 123     for (i = 0; i < 6; i++)
 124         tvb_composite_append(mac_tvb, mac_bytes_tvb[i]);
 125
 126     tvb_composite_finalize(mac_tvb);
 127
 128     proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_dst_mac, mac_tvb, 0 , 6, ENC_NA);
 129     col_add_str(pinfo->cinfo, COL_RES_DL_DST, tvb_ether_to_str(mac_tvb, 0));
 130
 131     data_tvb = tvb_new_subset_remaining(tvb, offset);
 132
 133     if (llc_snap_flag) {
 134         call_dissector(llc_handle, data_tvb, pinfo, tree);
 135     } else {
 136         call_dissector(ip_handle, data_tvb, pinfo, tree);
 137     }
 138
 139     packet_mpeg_sect_crc(tvb, pinfo, dvb_data_mpe_tree, 0, tot_len - 1);
 140     return;
 141
 142 }
 143
 144 void
 145 proto_register_dvb_data_mpe(void)
 146 {
 147
 148     static hf_register_info hf[] = {
 149
 150         /* DSM-CC common fields */
 151         { &hf_dvb_data_mpe_reserved, {
 152             "Reserved", "dvb_data_mpe.reserved",
 153             FT_UINT8, BASE_HEX, NULL, DVB_DATA_MPE_RESERVED_MASK, NULL, HFILL
 154         } },
 155
 156         { &hf_dvb_data_mpe_payload_scrambling_control, {
 157             "Payload Scrambling Control", "dvb_data_mpe.pload_scrambling",
 158             FT_UINT8, BASE_HEX, NULL, DVB_DATA_MPE_PAYLOAD_SCRAMBLING_MASK, NULL, HFILL
 159         } },
 160
 161         { &hf_dvb_data_mpe_address_scrambling_control, {
 162             "Address Scrambling Control", "dvb_data_mpe.addr_scrambling",
 163             FT_UINT8, BASE_HEX, NULL, DVB_DATA_MPE_ADDRESS_SCRAMBLING_MASK, NULL, HFILL
 164         } },
 165
 166         { &hf_dvb_data_mpe_llc_snap_flag, {
 167             "LLC SNAP Flag", "dvb_data_mpe.llc_snap_flag",
 168             FT_UINT8, BASE_HEX, NULL, DVB_DATA_MPE_LLC_SNAP_FLAG_MASK, NULL, HFILL
 169         } },
 170
 171         { &hf_dvb_data_mpe_current_next_indicator, {
 172             "Current/Next Indicator", "mpeg_sect.cur_next_ind",
 173             FT_UINT8, BASE_HEX, VALS(dvb_rcs_cur_next_vals), DVB_DATA_MPE_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
 174         } },
 175
 176         { &hf_dvb_data_mpe_section_number, {
 177             "Section Number", "dvb_data_mpe.sect_num",
 178             FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
 179         } },
 180
 181         { &hf_dvb_data_mpe_last_section_number, {
 182             "Last Section Number", "dvb_data_mpe.last_sect_num",
 183             FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
 184         } },
 185
 186         { &hf_dvb_data_mpe_dst_mac, {
 187             "Destination MAC address", "dvb_data_mpe.dst_mac",
 188             FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL
 189         } },
 190
 191
 192     };
 193
 194     static gint *ett[] = {
 195         &ett_dvb_data_mpe,
 196     };
 197
 198     proto_dvb_data_mpe = proto_register_protocol("DVB-DATA MultiProtocol Encapsulation", "DVB-DATA MPE", "dvb_data_mpe");
 199     proto_register_field_array(proto_dvb_data_mpe, hf, array_length(hf));
 200
 201     proto_register_subtree_array(ett, array_length(ett));
 202
 203 }
 204
 205
 206 void
 207 proto_reg_handoff_dvb_data_mpe(void)
 208 {
 209
 210     dissector_handle_t dvb_data_mpe_handle;
 211
 212     dvb_data_mpe_handle = create_dissector_handle(dissect_dvb_data_mpe, proto_dvb_data_mpe);
 213     dissector_add_uint("mpeg_sect.tid", DVB_DATA_MPE_TID, dvb_data_mpe_handle);
 214
 215     ip_handle  = find_dissector("ip");
 216     llc_handle = find_dissector("llc");
 217
 218 }
 219
 220 /*
 221  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 222  *
 223  * Local variables:
 224  * c-basic-offset: 4
 225  * tab-width: 8
 226  * indent-tabs-mode: nil
 227  * End:
 228  *
 229  * vi: set shiftwidth=4 tabstop=8 expandtab:
 230  * :indentSize=4:tabSize=8:noTabs=true:
 231  */