2012-02-11 16:52:32 +00:00
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/* 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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2018-02-12 11:23:27 +00:00
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* SPDX-License-Identifier: GPL-2.0-or-later
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2012-02-11 16:52:32 +00:00
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*/
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2012-09-20 02:03:38 +00:00
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#include "config.h"
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2012-02-11 16:52:32 +00:00
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#include <epan/packet.h>
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2021-02-27 02:58:31 +00:00
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#include <epan/expert.h>
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2013-11-09 13:41:10 +00:00
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#include <epan/to_str.h>
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2014-12-20 21:23:59 +00:00
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#include "packet-mpeg-sect.h"
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2012-02-11 16:52:32 +00:00
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2013-03-16 16:25:41 +00:00
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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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2012-02-11 16:52:32 +00:00
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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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2021-02-27 02:58:31 +00:00
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static int hf_dvb_data_mpe_dst_mac_scrambled = -1;
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2012-02-11 16:52:32 +00:00
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static gint ett_dvb_data_mpe = -1;
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2021-02-27 02:58:31 +00:00
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static expert_field ei_dvb_data_mpe_reserved_not_one = EI_INIT;
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static expert_field ei_dvb_data_mpe_payload_scrambled = EI_INIT;
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static expert_field ei_dvb_data_mpe_address_scrambled = EI_INIT;
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2012-02-11 16:52:32 +00:00
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static dissector_handle_t ip_handle;
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static dissector_handle_t llc_handle;
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2013-03-14 14:42:12 +00:00
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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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2012-02-11 16:52:32 +00:00
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2021-02-27 02:58:31 +00:00
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/* Field positions for the MAC Address */
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/* It is split into two chunks, one of two octets and a second
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* one of four octets. Also, the octets are in reverse order. */
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#define DVB_DATA_MPE_DST_MAC_FIRST 3
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#define DVB_DATA_MPE_DST_MAC_SECOND 8
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static const value_string dvb_data_mpe_scrambling_vals[] = {
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{ 0, "Unscrambled" },
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{ 1, "Defined by service" },
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{ 2, "Defined by service" },
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{ 3, "Defined by service" },
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{ 0, NULL }
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};
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2012-02-11 16:52:32 +00:00
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static const value_string dvb_rcs_cur_next_vals[] = {
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2012-03-12 17:53:58 +00:00
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2013-03-14 14:42:12 +00:00
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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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2012-02-11 16:52:32 +00:00
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};
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2015-11-15 13:00:10 +00:00
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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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2012-02-11 16:52:32 +00:00
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{
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2013-03-14 14:42:12 +00:00
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guint offset = 0, tot_len = 0;
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2021-02-27 02:58:31 +00:00
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guint32 reserved, address_scrambling, payload_scrambling, llc_snap_flag;
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2013-03-14 14:42:12 +00:00
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int i;
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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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proto_item *ti;
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proto_tree *dvb_data_mpe_tree;
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2021-02-27 02:58:31 +00:00
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guchar *dst = (guchar*)wmem_alloc(pinfo->pool, 6);
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address dst_addr;
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2013-03-14 14:42:12 +00:00
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tvbuff_t *data_tvb;
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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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/* The TVB should start right after the section_length in the Section packet */
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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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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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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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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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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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offset += packet_mpeg_sect_header(tvb, offset, dvb_data_mpe_tree, &tot_len, NULL);
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2012-03-13 08:57:04 +00:00
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2013-03-14 14:42:12 +00:00
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/* Parse the DMC-CC private section header */
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2012-02-11 16:52:32 +00:00
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2021-02-27 02:58:31 +00:00
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dst[5] = tvb_get_guint8(tvb, offset);
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2013-03-14 14:42:12 +00:00
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offset += 1;
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2021-02-27 02:58:31 +00:00
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dst[4] = tvb_get_guint8(tvb, offset);
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2013-03-14 14:42:12 +00:00
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offset += 1;
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2012-02-11 16:52:32 +00:00
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2021-02-27 02:58:31 +00:00
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ti = proto_tree_add_item_ret_uint(dvb_data_mpe_tree, hf_dvb_data_mpe_reserved, tvb, offset, 1, ENC_BIG_ENDIAN, &reserved);
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if (reserved != 3) {
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expert_add_info(pinfo, ti, &ei_dvb_data_mpe_reserved_not_one);
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}
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ti = proto_tree_add_item_ret_uint(dvb_data_mpe_tree, hf_dvb_data_mpe_payload_scrambling_control, tvb, offset, 1, ENC_BIG_ENDIAN, &payload_scrambling);
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if (payload_scrambling) {
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expert_add_info(pinfo, ti, &ei_dvb_data_mpe_payload_scrambled);
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}
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proto_tree_add_item_ret_uint(dvb_data_mpe_tree, hf_dvb_data_mpe_address_scrambling_control, tvb, offset, 1, ENC_BIG_ENDIAN, &address_scrambling);
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proto_tree_add_item_ret_uint(dvb_data_mpe_tree, hf_dvb_data_mpe_llc_snap_flag, tvb, offset, 1, ENC_BIG_ENDIAN, &llc_snap_flag);
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2013-12-12 20:16:30 +00:00
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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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2013-03-14 14:42:12 +00:00
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offset += 1;
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2012-02-11 16:52:32 +00:00
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2013-12-12 20:16:30 +00:00
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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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2013-03-14 14:42:12 +00:00
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offset += 1;
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2012-02-11 16:52:32 +00:00
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2013-12-12 20:16:30 +00:00
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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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2013-03-14 14:42:12 +00:00
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offset += 1;
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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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for (i = 3; i >= 0; i--) {
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2021-02-27 02:58:31 +00:00
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dst[i] = tvb_get_guint8(tvb, offset);
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2013-03-14 14:42:12 +00:00
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offset += 1;
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}
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2012-02-11 16:52:32 +00:00
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2021-02-27 02:58:31 +00:00
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if (address_scrambling) {
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ti = proto_tree_add_bytes_with_length(dvb_data_mpe_tree, hf_dvb_data_mpe_dst_mac_scrambled, tvb, DVB_DATA_MPE_DST_MAC_FIRST, 2, dst, 6);
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expert_add_info(pinfo, ti, &ei_dvb_data_mpe_address_scrambled);
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} else {
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ti = proto_tree_add_ether(dvb_data_mpe_tree, hf_dvb_data_mpe_dst_mac, tvb, DVB_DATA_MPE_DST_MAC_FIRST, 2, dst);
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set_address(&dst_addr, AT_ETHER, 6, dst);
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col_add_str(pinfo->cinfo, COL_RES_DL_DST, address_to_str(pinfo->pool, &dst_addr));
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}
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/* Extend the highlighting for the second chunk. */
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proto_tree_set_appendix(ti, tvb, DVB_DATA_MPE_DST_MAC_SECOND, 4);
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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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data_tvb = tvb_new_subset_remaining(tvb, offset);
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2012-02-11 16:52:32 +00:00
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2021-02-27 02:58:31 +00:00
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if (payload_scrambling) {
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call_data_dissector(data_tvb, pinfo, tree);
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} else if (llc_snap_flag) {
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2013-03-14 14:42:12 +00:00
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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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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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packet_mpeg_sect_crc(tvb, pinfo, dvb_data_mpe_tree, 0, tot_len - 1);
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2015-11-15 13:00:10 +00:00
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return tvb_captured_length(tvb);
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2012-02-11 16:52:32 +00:00
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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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2013-03-14 14:42:12 +00:00
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static hf_register_info hf[] = {
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2012-03-12 17:53:58 +00:00
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2013-03-14 14:42:12 +00:00
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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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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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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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2021-02-27 02:58:31 +00:00
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FT_UINT8, BASE_HEX, VALS(dvb_data_mpe_scrambling_vals),
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DVB_DATA_MPE_PAYLOAD_SCRAMBLING_MASK, NULL, HFILL
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2013-03-14 14:42:12 +00:00
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} },
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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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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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2021-02-27 02:58:31 +00:00
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FT_UINT8, BASE_HEX, VALS(dvb_data_mpe_scrambling_vals),
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DVB_DATA_MPE_ADDRESS_SCRAMBLING_MASK, NULL, HFILL
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2013-03-14 14:42:12 +00:00
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} },
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2012-03-12 17:53:58 +00:00
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2013-03-14 14:42:12 +00:00
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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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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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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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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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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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2012-03-12 17:53:58 +00:00
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2013-03-14 14:42:12 +00:00
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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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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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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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2021-02-27 02:58:31 +00:00
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FT_ETHER, BASE_NONE, NULL, 0, NULL, HFILL
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2013-03-14 14:42:12 +00:00
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} },
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2012-02-11 16:52:32 +00:00
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2021-02-27 02:58:31 +00:00
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{ &hf_dvb_data_mpe_dst_mac_scrambled, {
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"Destination MAC address (scrambled)",
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"dvb_data_mpe.dst_mac.scrambled",
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FT_BYTES, SEP_COLON, NULL, 0, NULL, HFILL
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} },
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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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};
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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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static gint *ett[] = {
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&ett_dvb_data_mpe,
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};
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2012-02-11 16:52:32 +00:00
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2021-02-27 02:58:31 +00:00
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expert_module_t *expert_dvb_data_mpe;
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static ei_register_info ei[] = {
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{ &ei_dvb_data_mpe_reserved_not_one,
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{ "dvb_data_mpe.reserved.not_one", PI_PROTOCOL, PI_WARN,
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"Reserved bits not all ones", EXPFILL }},
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{ &ei_dvb_data_mpe_address_scrambled,
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{ "dvb_data_mpe.address_scrambled", PI_UNDECODED, PI_WARN,
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"Cannot descramble destination MAC address (user private scrambling)", EXPFILL }},
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{ &ei_dvb_data_mpe_payload_scrambled,
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{ "dvb_data_mpe.payload.scrambled", PI_UNDECODED, PI_WARN,
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"Cannot descramble payload (user private scrambling)", EXPFILL }},
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};
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2013-03-14 14:42:12 +00:00
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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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2021-02-27 02:58:31 +00:00
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expert_dvb_data_mpe = expert_register_protocol(proto_dvb_data_mpe);
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expert_register_field_array(expert_dvb_data_mpe, ei, array_length(ei));
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2012-02-11 16:52:32 +00:00
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2013-03-14 14:42:12 +00:00
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proto_register_subtree_array(ett, array_length(ett));
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2012-03-12 17:53:58 +00:00
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2012-02-11 16:52:32 +00:00
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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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2012-03-12 17:53:58 +00:00
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2013-03-14 14:42:12 +00:00
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dissector_handle_t dvb_data_mpe_handle;
|
2012-02-11 16:52:32 +00:00
|
|
|
|
2015-12-09 03:49:44 +00:00
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|
|
dvb_data_mpe_handle = create_dissector_handle(dissect_dvb_data_mpe, proto_dvb_data_mpe);
|
2013-03-14 14:42:12 +00:00
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dissector_add_uint("mpeg_sect.tid", DVB_DATA_MPE_TID, dvb_data_mpe_handle);
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2012-02-11 16:52:32 +00:00
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|
2016-03-16 13:02:52 +00:00
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|
ip_handle = find_dissector_add_dependency("ip", proto_dvb_data_mpe);
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|
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llc_handle = find_dissector_add_dependency("llc", proto_dvb_data_mpe);
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2012-02-11 16:52:32 +00:00
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}
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2012-09-03 18:50:21 +00:00
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/*
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2019-07-26 18:43:17 +00:00
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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2012-09-03 18:50:21 +00:00
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*
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* Local variables:
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* c-basic-offset: 4
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2013-03-14 14:42:12 +00:00
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* tab-width: 8
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* indent-tabs-mode: nil
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2012-09-03 18:50:21 +00:00
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* End:
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*
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2013-03-14 14:42:12 +00:00
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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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2012-09-03 18:50:21 +00:00
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*/
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