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/* packet-trel.c
* Routines for TREL packet dissection
* Copyright 2004, Pranay Nagpure - <pranay.dilip@graniteriverlabs.in>
*
* 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 "packet-ieee802154.h"
#include <epan/wmem_scopes.h>
#include <epan/packet_info.h>
#include <epan/proto_data.h>
#include <epan/proto.h>
#include <packet-mle.h>
#include <packet-6lowpan.h>
#include <epan/expert.h>
#include<wsutil/wsgcrypt.h>
#define TREL_PORT 38196
#define TREL_TYPE_BROADCAST 0
#define TREL_TYPE_UNICAST 1
#define TREL_TYPE_ACK 2
static dissector_handle_t trel_handle;
static int hf_trel_version;
static int hf_trel_rsv;
static int hf_trel_ack;
static int hf_trel_type;
static int hf_trel_channel;
static int hf_802154_dest_panid;
static int hf_trel_source_addr;
static int hf_trel_destination_addr;
static int hf_trel_packetno;
static int proto_trel;
static int ett_trel;
static int ett_trel_hdr;
void proto_register_trel(void);
static const value_string trel_command_vals[] = {
{ TREL_TYPE_BROADCAST, "TREL Advertisement" },
{ TREL_TYPE_UNICAST, "TREL Unicast Response" },
{ TREL_TYPE_ACK, "TREL Acknowledgement"},
{ 0, NULL}
};
static int
dissect_trel(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree, void* data _U_)
{
proto_tree* volatile trel_tree = NULL, * volatile trel_hdr_tree;
proto_item* volatile proto_root = NULL;
unsigned offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TREL");
col_clear(pinfo->cinfo, COL_INFO);
proto_root = proto_tree_add_item(tree, proto_trel, tvb, 0, tvb_reported_length(tvb), ENC_NA);
trel_tree = proto_item_add_subtree(proto_root, ett_trel);
//add header subtree
trel_hdr_tree = proto_tree_add_subtree(trel_tree, tvb, 0, 4, ett_trel_hdr, NULL, "Header");
proto_tree_add_item(trel_hdr_tree, hf_trel_version, tvb, offset, 1, ENC_NA);
proto_tree_add_item(trel_hdr_tree, hf_trel_rsv, tvb, offset, 1, ENC_NA);
proto_tree_add_item(trel_hdr_tree, hf_trel_ack, tvb, offset, 1, ENC_NA);
proto_tree_add_item(trel_hdr_tree, hf_trel_type, tvb, offset, 1, ENC_NA);
uint8_t type = tvb_get_uint8(tvb, offset);
col_add_str(pinfo->cinfo, COL_INFO, val_to_str(type, trel_command_vals, "Unknown (%x)"));
++offset;
proto_tree_add_item(trel_hdr_tree, hf_trel_channel, tvb, offset, 1, ENC_NA);
++offset;
proto_tree_add_item(trel_hdr_tree, hf_802154_dest_panid, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(trel_hdr_tree, hf_trel_packetno, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(trel_hdr_tree, hf_trel_source_addr, tvb, offset, 8, ENC_BIG_ENDIAN);
offset += 8;
if (type)
{
proto_tree_add_item(trel_hdr_tree, hf_trel_destination_addr, tvb, offset, 8, ENC_BIG_ENDIAN);
offset += 8;
}
dissector_handle_t frame_handle = find_dissector("wpan_nofcs");
tvbuff_t* payload = tvb_new_subset_remaining(tvb, offset);
if (tvb_reported_length(payload))
call_dissector(frame_handle, payload, pinfo, trel_tree);
return tvb_captured_length(tvb);
}
// below code is added to replace mdns dissector registration
static bool
dissect_trel_heur(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree, void* data)
{
if ((tvb_captured_length(tvb)) < 16 ) {
return false;
}
uint8_t first = tvb_get_uint8(tvb, 0);
if ((first & 0xE0) != 0)
return false;
if (pinfo->srcport == pinfo->destport) return false;
dissect_trel(tvb, pinfo, tree, data);
return true;
}
void
proto_register_trel(void)
{
static hf_register_info hf[] = {
{ &hf_trel_version,
{ "TREL version",
"trel.ver",
FT_UINT8, BASE_DEC, NULL, 0xE0,
"The TREL protocol version",
HFILL
}
},
{ &hf_trel_rsv,
{ "TREL reserved bit",
"trel.rsv",
FT_UINT8, BASE_DEC, NULL, 0x18,
"The TREL reserved bit",
HFILL
}
},
{ &hf_trel_ack,
{ "TREL acknowledgement",
"trel.ack",
FT_UINT8, BASE_DEC, NULL, 0x4,
"The TREL acknowledgement",
HFILL
}
},
{ &hf_trel_type,
{ "TREL type",
"trel.type",
FT_UINT8, BASE_DEC, NULL, 0x3,
"The TREL type",
HFILL
}
},
{ &hf_trel_channel,
{ "TREL channel",
"trel.channel",
FT_UINT8, BASE_DEC, NULL, 0x0,
"The TREL channel",
HFILL
}
},
{ &hf_802154_dest_panid,
{ "TREL 802.15.4 Dest Pan ID",
"trel.panID",
FT_UINT16, BASE_DEC, NULL, 0x0,
"The TREL 802.15.4 Dest Pan ID",
HFILL
}
},
{ &hf_trel_packetno,
{ "TREL packet number",
"trel.packetno",
FT_UINT32, BASE_DEC, NULL, 0x0,
"The TREL packet number",
HFILL
}
},
{ &hf_trel_source_addr,
{ "TREL Src Address",
"trel.source_addr",
FT_EUI64, BASE_NONE, NULL, 0x0,
"Source address",
HFILL
}
},
{ &hf_trel_destination_addr,
{ "TREL Dest Address",
"trel.destination_addr",
FT_EUI64, BASE_NONE, NULL, 0x0,
"Destination address",
HFILL
}
}
};
static int* ett[] = {
&ett_trel,
&ett_trel_hdr
};
proto_trel = proto_register_protocol("TREL Protocol", "TREL", "trel");
proto_register_field_array(proto_trel, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
trel_handle = register_dissector("trel", dissect_trel, proto_trel);
}
void
proto_reg_handoff_trel(void)
{
//heur dissector is disabled as it not strong enough
//dissector_add_uint("udp.port", TREL_PORT, trel_handle);
dissector_add_uint_with_preference("udp.port", 0, trel_handle);
heur_dissector_add("udp", dissect_trel_heur, "TREL over UDP", "trel_udp", proto_trel, HEURISTIC_DISABLE);
}
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