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-rw-r--r--epan/dissectors/packet-dvb-data-mpe.c251
1 files changed, 251 insertions, 0 deletions
diff --git a/epan/dissectors/packet-dvb-data-mpe.c b/epan/dissectors/packet-dvb-data-mpe.c
new file mode 100644
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+++ b/epan/dissectors/packet-dvb-data-mpe.c
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+/* packet-dvb-data-mpe.c
+ * Routines for DVB-DATA (ETSI EN 301 192) MultiProtocol Encapsulation
+ * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
+ *
+ * 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/expert.h>
+#include <epan/to_str.h>
+#include "packet-mpeg-sect.h"
+
+void proto_register_dvb_data_mpe(void);
+void proto_reg_handoff_dvb_data_mpe(void);
+
+static int proto_dvb_data_mpe = -1;
+static int hf_dvb_data_mpe_reserved = -1;
+static int hf_dvb_data_mpe_payload_scrambling_control = -1;
+static int hf_dvb_data_mpe_address_scrambling_control = -1;
+static int hf_dvb_data_mpe_llc_snap_flag = -1;
+static int hf_dvb_data_mpe_current_next_indicator = -1;
+static int hf_dvb_data_mpe_section_number = -1;
+static int hf_dvb_data_mpe_last_section_number = -1;
+static int hf_dvb_data_mpe_dst_mac = -1;
+static int hf_dvb_data_mpe_dst_mac_scrambled = -1;
+
+static gint ett_dvb_data_mpe = -1;
+
+static expert_field ei_dvb_data_mpe_reserved_not_one = EI_INIT;
+static expert_field ei_dvb_data_mpe_payload_scrambled = EI_INIT;
+static expert_field ei_dvb_data_mpe_address_scrambled = EI_INIT;
+
+static dissector_handle_t dvb_data_mpe_handle;
+
+static dissector_handle_t ip_handle;
+static dissector_handle_t llc_handle;
+
+#define DVB_DATA_MPE_RESERVED_MASK 0xC0
+#define DVB_DATA_MPE_PAYLOAD_SCRAMBLING_MASK 0x30
+#define DVB_DATA_MPE_ADDRESS_SCRAMBLING_MASK 0x0C
+#define DVB_DATA_MPE_LLC_SNAP_FLAG_MASK 0x02
+#define DVB_DATA_MPE_CURRENT_NEXT_INDICATOR_MASK 0x01
+
+/* Field positions for the MAC Address */
+/* It is split into two chunks, one of two octets and a second
+ * one of four octets. Also, the octets are in reverse order. */
+#define DVB_DATA_MPE_DST_MAC_FIRST 3
+#define DVB_DATA_MPE_DST_MAC_SECOND 8
+
+static const value_string dvb_data_mpe_scrambling_vals[] = {
+ { 0, "Unscrambled" },
+ { 1, "Defined by service" },
+ { 2, "Defined by service" },
+ { 3, "Defined by service" },
+ { 0, NULL }
+};
+
+static int
+dissect_dvb_data_mpe(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+
+ guint offset = 0, tot_len = 0;
+ guint32 reserved, address_scrambling, payload_scrambling, llc_snap_flag;
+ int i;
+
+ proto_item *ti;
+ proto_tree *dvb_data_mpe_tree;
+ guchar *dst = (guchar*)wmem_alloc(pinfo->pool, 6);
+ address dst_addr;
+ tvbuff_t *data_tvb;
+
+ /* The TVB should start right after the section_length in the Section packet */
+
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "DVB-DATA");
+ col_set_str(pinfo->cinfo, COL_INFO, "MultiProtocol Encapsulation");
+
+ ti = proto_tree_add_item(tree, proto_dvb_data_mpe, tvb, offset, -1, ENC_NA);
+ dvb_data_mpe_tree = proto_item_add_subtree(ti, ett_dvb_data_mpe);
+
+ offset += packet_mpeg_sect_header(tvb, offset, dvb_data_mpe_tree, &tot_len, NULL);
+
+
+ /* Parse the DMC-CC private section header */
+
+ dst[5] = tvb_get_guint8(tvb, offset);
+ offset += 1;
+ dst[4] = tvb_get_guint8(tvb, offset);
+ offset += 1;
+
+ ti = proto_tree_add_item_ret_uint(dvb_data_mpe_tree, hf_dvb_data_mpe_reserved, tvb, offset, 1, ENC_BIG_ENDIAN, &reserved);
+ if (reserved != 3) {
+ expert_add_info(pinfo, ti, &ei_dvb_data_mpe_reserved_not_one);
+ }
+ 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);
+ if (payload_scrambling) {
+ expert_add_info(pinfo, ti, &ei_dvb_data_mpe_payload_scrambled);
+ }
+ 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);
+ 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);
+ proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
+ offset += 1;
+
+ proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
+ offset += 1;
+
+ proto_tree_add_item(dvb_data_mpe_tree, hf_dvb_data_mpe_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
+ offset += 1;
+
+ for (i = 3; i >= 0; i--) {
+ dst[i] = tvb_get_guint8(tvb, offset);
+ offset += 1;
+ }
+
+ if (address_scrambling) {
+ 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);
+ expert_add_info(pinfo, ti, &ei_dvb_data_mpe_address_scrambled);
+ } else {
+ ti = proto_tree_add_ether(dvb_data_mpe_tree, hf_dvb_data_mpe_dst_mac, tvb, DVB_DATA_MPE_DST_MAC_FIRST, 2, dst);
+ set_address(&dst_addr, AT_ETHER, 6, dst);
+ col_add_str(pinfo->cinfo, COL_RES_DL_DST, address_to_str(pinfo->pool, &dst_addr));
+ }
+ /* Extend the highlighting for the second chunk. */
+ proto_tree_set_appendix(ti, tvb, DVB_DATA_MPE_DST_MAC_SECOND, 4);
+
+ data_tvb = tvb_new_subset_remaining(tvb, offset);
+
+ if (payload_scrambling) {
+ call_data_dissector(data_tvb, pinfo, tree);
+ } else if (llc_snap_flag) {
+ call_dissector(llc_handle, data_tvb, pinfo, tree);
+ } else {
+ call_dissector(ip_handle, data_tvb, pinfo, tree);
+ }
+
+ packet_mpeg_sect_crc(tvb, pinfo, dvb_data_mpe_tree, 0, tot_len - 1);
+ return tvb_captured_length(tvb);
+}
+
+void
+proto_register_dvb_data_mpe(void)
+{
+
+ static hf_register_info hf[] = {
+
+ /* DSM-CC common fields */
+ { &hf_dvb_data_mpe_reserved, {
+ "Reserved", "dvb_data_mpe.reserved",
+ FT_UINT8, BASE_HEX, NULL, DVB_DATA_MPE_RESERVED_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_data_mpe_payload_scrambling_control, {
+ "Payload Scrambling Control", "dvb_data_mpe.pload_scrambling",
+ FT_UINT8, BASE_HEX, VALS(dvb_data_mpe_scrambling_vals),
+ DVB_DATA_MPE_PAYLOAD_SCRAMBLING_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_data_mpe_address_scrambling_control, {
+ "Address Scrambling Control", "dvb_data_mpe.addr_scrambling",
+ FT_UINT8, BASE_HEX, VALS(dvb_data_mpe_scrambling_vals),
+ DVB_DATA_MPE_ADDRESS_SCRAMBLING_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_data_mpe_llc_snap_flag, {
+ "LLC SNAP Flag", "dvb_data_mpe.llc_snap_flag",
+ FT_UINT8, BASE_HEX, NULL, DVB_DATA_MPE_LLC_SNAP_FLAG_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_data_mpe_current_next_indicator, {
+ "Current/Next Indicator", "mpeg_sect.cur_next_ind",
+ FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), DVB_DATA_MPE_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
+ } },
+
+ { &hf_dvb_data_mpe_section_number, {
+ "Section Number", "dvb_data_mpe.sect_num",
+ FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_data_mpe_last_section_number, {
+ "Last Section Number", "dvb_data_mpe.last_sect_num",
+ FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_data_mpe_dst_mac, {
+ "Destination MAC address", "dvb_data_mpe.dst_mac",
+ FT_ETHER, BASE_NONE, NULL, 0, NULL, HFILL
+ } },
+
+ { &hf_dvb_data_mpe_dst_mac_scrambled, {
+ "Destination MAC address (scrambled)",
+ "dvb_data_mpe.dst_mac.scrambled",
+ FT_BYTES, SEP_COLON, NULL, 0, NULL, HFILL
+ } },
+
+ };
+
+ static gint *ett[] = {
+ &ett_dvb_data_mpe,
+ };
+
+ expert_module_t *expert_dvb_data_mpe;
+ static ei_register_info ei[] = {
+ { &ei_dvb_data_mpe_reserved_not_one,
+ { "dvb_data_mpe.reserved.not_one", PI_PROTOCOL, PI_WARN,
+ "Reserved bits not all ones", EXPFILL }},
+ { &ei_dvb_data_mpe_address_scrambled,
+ { "dvb_data_mpe.address_scrambled", PI_UNDECODED, PI_WARN,
+ "Cannot descramble destination MAC address (user private scrambling)", EXPFILL }},
+ { &ei_dvb_data_mpe_payload_scrambled,
+ { "dvb_data_mpe.payload.scrambled", PI_UNDECODED, PI_WARN,
+ "Cannot descramble payload (user private scrambling)", EXPFILL }},
+ };
+
+ proto_dvb_data_mpe = proto_register_protocol("DVB-DATA MultiProtocol Encapsulation", "DVB-DATA MPE", "dvb_data_mpe");
+ proto_register_field_array(proto_dvb_data_mpe, hf, array_length(hf));
+ expert_dvb_data_mpe = expert_register_protocol(proto_dvb_data_mpe);
+ expert_register_field_array(expert_dvb_data_mpe, ei, array_length(ei));
+
+ proto_register_subtree_array(ett, array_length(ett));
+
+ dvb_data_mpe_handle = register_dissector("dvb_data_mpe", dissect_dvb_data_mpe, proto_dvb_data_mpe);
+}
+
+
+void
+proto_reg_handoff_dvb_data_mpe(void)
+{
+ dissector_add_uint("mpeg_sect.tid", DVB_DATA_MPE_TID, dvb_data_mpe_handle);
+
+ ip_handle = find_dissector_add_dependency("ip", proto_dvb_data_mpe);
+ llc_handle = find_dissector_add_dependency("llc", proto_dvb_data_mpe);
+
+}
+
+/*
+ * Editor modelines - https://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:
+ */
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