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/* wimax_fch_decoder.c
* WiMax FCH Burst decoder
*
* Copyright (c) 2007 by Intel Corporation.
*
* Author: Lu Pan <lu.pan@intel.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* Include files */
#include "config.h"
#include <string.h>
#include <epan/packet.h>
#include "wimax-int.h"
extern gint proto_wimax;
extern address bs_address; /* declared in packet-wmx.c */
static int proto_wimax_fch_decoder = -1;
static gint ett_wimax_fch_decoder = -1;
#define FCH_BURST_LENGTH 3
/* FCH Burst bits */
#define USED_SUB_CHANNEL_GROUP_0 0x800000
#define USED_SUB_CHANNEL_GROUP_1 0x400000
#define USED_SUB_CHANNEL_GROUP_2 0x200000
#define USED_SUB_CHANNEL_GROUP_3 0x100000
#define USED_SUB_CHANNEL_GROUP_4 0x080000
#define USED_SUB_CHANNEL_GROUP_5 0x040000
#define FCH_RESERVED_1 0x020000
#define REPETITION_CODING_INDICATION 0x018000
#define CODING_INDICATION 0x007000
#define DL_MAP_LENGTH 0x000FF0
#define FCH_RESERVED_2 0x00000F
static int hf_fch_used_subchannel_group0 = -1;
static int hf_fch_used_subchannel_group1 = -1;
static int hf_fch_used_subchannel_group2 = -1;
static int hf_fch_used_subchannel_group3 = -1;
static int hf_fch_used_subchannel_group4 = -1;
static int hf_fch_used_subchannel_group5 = -1;
static int hf_fch_reserved_1 = -1;
static int hf_fch_repetition_coding_indication = -1;
static int hf_fch_coding_indication = -1;
static int hf_fch_dlmap_length = -1;
static int hf_fch_reserved_2 = -1;
static const value_string used_or_not_used[] =
{
{ 0, "Is Not Used" },
{ 1, "Is Used" },
{ 0, NULL }
};
/* DL Frame Prefix Repetition Coding Indications */
static const value_string repetition_coding_indications[] =
{
{ 0, "No Repetition Coding" },
{ 1, "Repetition Coding of 2 Used" },
{ 2, "Repetition Coding of 4 Used" },
{ 3, "Repetition Coding of 6 Used" },
{ 0, NULL }
};
/* DL Frame Prefix Coding Indications */
static const value_string coding_indications[] =
{
{ 0, "CC Encoding Used" },
{ 1, "BTC Encoding Used" },
{ 2, "CTC Encoding Used" },
{ 3, "ZT CC Encoding Used" },
{ 4, "CC Encoding with optional interleaver" },
{ 5, "LDPC Encoding Used" },
{ 6, "Reserved" },
{ 7, "Reserved" },
{ 0, NULL }
};
static int dissect_wimax_fch_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
gint offset = 0;
proto_item *fch_item = NULL;
proto_tree *fch_tree = NULL;
/* save the base station address (once) */
if(!bs_address.len)
copy_address(&bs_address, &(pinfo->src));
/* update the info column */
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "FCH");
if (tree)
{ /* we are being asked for details */
/* display FCH dissector info */
fch_item = proto_tree_add_protocol_format(tree, proto_wimax_fch_decoder, tvb, offset, 3, "DL Frame Prefix (24 bits)");
/* add FCH subtree */
fch_tree = proto_item_add_subtree(fch_item, ett_wimax_fch_decoder);
/* Decode and display the used sub-channel groups */
proto_tree_add_item(fch_tree, hf_fch_used_subchannel_group0, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(fch_tree, hf_fch_used_subchannel_group1, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(fch_tree, hf_fch_used_subchannel_group2, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(fch_tree, hf_fch_used_subchannel_group3, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(fch_tree, hf_fch_used_subchannel_group4, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(fch_tree, hf_fch_used_subchannel_group5, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(fch_tree, hf_fch_reserved_1, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
/* Decode and display the repetition coding indication */
proto_tree_add_item(fch_tree, hf_fch_repetition_coding_indication, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
/* Decode and display the coding indication */
proto_tree_add_item(fch_tree, hf_fch_coding_indication, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
/* Decode and display the DL MAP length */
proto_tree_add_item(fch_tree, hf_fch_dlmap_length, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(fch_tree, hf_fch_reserved_2, tvb, offset, FCH_BURST_LENGTH, ENC_BIG_ENDIAN);
}
return tvb_captured_length(tvb);
}
/* Register Wimax FCH Protocol */
void wimax_proto_register_wimax_fch(void)
{
/* TLV display */
static hf_register_info hf[] =
{
{
&hf_fch_used_subchannel_group0,
{
"Sub-Channel Group 0", "wmx.fch.subchannel_group0",
FT_UINT24, BASE_DEC, VALS(used_or_not_used), USED_SUB_CHANNEL_GROUP_0,
NULL, HFILL
}
},
{
&hf_fch_used_subchannel_group1,
{
"Sub-Channel Group 1", "wmx.fch.subchannel_group1",
FT_UINT24, BASE_DEC, VALS(used_or_not_used), USED_SUB_CHANNEL_GROUP_1,
NULL, HFILL
}
},
{
&hf_fch_used_subchannel_group2,
{
"Sub-Channel Group 2", "wmx.fch.subchannel_group2",
FT_UINT24, BASE_DEC, VALS(used_or_not_used), USED_SUB_CHANNEL_GROUP_2,
NULL, HFILL
}
},
{
&hf_fch_used_subchannel_group3,
{
"Sub-Channel Group 3", "wmx.fch.subchannel_group3",
FT_UINT24, BASE_DEC, VALS(used_or_not_used), USED_SUB_CHANNEL_GROUP_3,
NULL, HFILL
}
},
{
&hf_fch_used_subchannel_group4,
{
"Sub-Channel Group 4", "wmx.fch.subchannel_group4",
FT_UINT24, BASE_DEC, VALS(used_or_not_used), USED_SUB_CHANNEL_GROUP_4,
NULL, HFILL
}
},
{
&hf_fch_used_subchannel_group5,
{
"Sub-Channel Group 5", "wmx.fch.subchannel_group5",
FT_UINT24, BASE_DEC, VALS(used_or_not_used), USED_SUB_CHANNEL_GROUP_5,
NULL, HFILL
}
},
{
&hf_fch_reserved_1,
{
"Reserved", "wmx.fch.reserved1",
FT_UINT24, BASE_DEC, NULL, FCH_RESERVED_1,
NULL, HFILL
}
},
{
&hf_fch_repetition_coding_indication,
{
"Repetition Coding Indication", "wmx.fch.repetition_coding_indication",
FT_UINT24, BASE_DEC, VALS(repetition_coding_indications), REPETITION_CODING_INDICATION,
NULL, HFILL
}
},
{
&hf_fch_coding_indication,
{
"Coding Indication", "wmx.fch.coding_indication",
FT_UINT24, BASE_DEC, VALS(coding_indications), CODING_INDICATION,
NULL, HFILL
}
},
{
&hf_fch_dlmap_length,
{
"DL Map Length", "wmx.fch.dl_map_length",
FT_UINT24, BASE_DEC, NULL, DL_MAP_LENGTH,
NULL, HFILL
}
},
{
&hf_fch_reserved_2,
{
"Reserved", "wmx.fch.reserved2",
FT_UINT24, BASE_DEC, NULL, FCH_RESERVED_2,
NULL, HFILL
}
}
};
/* Setup protocol subtree array */
static gint *ett[] =
{
&ett_wimax_fch_decoder,
};
proto_wimax_fch_decoder = proto_wimax;
/* register the field display messages */
proto_register_field_array(proto_wimax_fch_decoder, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
register_dissector("wimax_fch_burst_handler", dissect_wimax_fch_decoder, proto_wimax_fch_decoder);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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