?? plugins-wimax-wimax_pdu_decoder.c
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Makefile.am
Makefile.common
Makefile.nmake
README.wimax
crc.c
crc.h
crc_data.c
mac_hd_generic_decoder.c
mac_hd_type1_decoder.c
mac_hd_type2_decoder.c
mac_mgmt_msg_decoder.c
moduleinfo.h
moduleinfo.nmake
msg_aas_beam.c
msg_aas_fbck.c
msg_arq.c
msg_clk_cmp.c
msg_dcd.c
msg_dlmap.c
msg_dreg.c
msg_dsa.c
msg_dsc.c
msg_dsd.c
msg_dsx_rvd.c
msg_fpc.c
msg_pkm.c
msg_pmc.c
msg_prc_lt_ctrl.c
msg_reg_req.c
msg_reg_rsp.c
msg_rep.c
msg_res_cmd.c
msg_rng_req.c
msg_rng_rsp.c
msg_sbc.c
msg_ucd.c
msg_ulmap.c
packet-wmx.c
plugin.rc.in
wimax_bits.h
wimax_cdma_code_decoder.c
wimax_compact_dlmap_ie_decoder.c
wimax_compact_ulmap_ie_decoder.c
wimax_fch_decoder.c
wimax_ffb_decoder.c
wimax_hack_decoder.c
wimax_harq_map_decoder.c
wimax_mac.h
wimax_pdu_decoder.c
wimax_phy_attributes_decoder.c
wimax_tlv.c
wimax_tlv.h
wimax_utils.c
wimax_utils.h
/* wimax_pdu_decoder.c
* WiMax PDU Burst decoder
*
* Copyright (c) 2007 by Intel Corporation.
*
* Author: Lu Pan <lu.pan@intel.com>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* Include files */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#include "crc.h"
extern gint proto_wimax;
extern void proto_register_mac_header_generic(void);
extern void proto_register_mac_header_type_1(void);
extern void proto_register_mac_header_type_2(void);
/* MAC Header dissector prototypes */
extern void dissect_mac_header_generic_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
extern void dissect_mac_header_type_1_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
extern void dissect_mac_header_type_2_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
extern void dissector_wimax_harq_map_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
extern gboolean is_down_link(address *src_address);
extern gint wimax_decode_dlmap_reduced_aas(tvbuff_t *tvb, packet_info *pinfo, proto_tree *base_tree);
extern gint wimax_decode_dlmapc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *pdu_tree);
#define WIMAX_PDU_PADDING_MASK 0xFF
#define WIMAX_INVALID_PDU_MASK 0xF0
#define WIMAX_MAP_TYPE_MASK 0xE0 /* 0b111 */
#define WIMAX_HARQ_MAP_MSG_IND 0xE0 /* 0b111 */
#define WIMAX_COMPRESSED_DL_MAP_IND 0xC0 /* 0b110 */
#define REDUCED_PRIVATE_MAP_MASK 0x0C /* 0b11 */
#define WIMAX_MAC_HEADER_SIZE 6
#define WIMAX_MAC_HEADER_INFO_FIELDS 5
#define WIMAX_MAC_HEADER_HT_FIELD 0x80
#define WIMAX_MAC_HEADER_EC_FIELD 0x40
#define WIMAX_MAC_HEADER_LENGTH_MSB_MASK 0x07
#define WIMAX_HARQ_MAP_MSG_LENGTH_MASK1 0x07FC
/* Global Variables. */
gboolean first_gmh;
/* forward reference */
static void dissect_wimax_pdu_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static gint proto_wimax_pdu_decoder = -1;
static gint ett_wimax_pdu_decoder = -1;
static int hf_wimax_value_bytes = -1;
/* PDU display */
static hf_register_info hf[] =
{
{
&hf_wimax_value_bytes,
{
"Values", "wimax.pdu.value",
FT_BYTES, BASE_HEX, NULL, 0x0,
"", HFILL
}
},
};
/* Setup protocol subtree array */
static gint *ett[] =
{
&ett_wimax_pdu_decoder,
};
/* Register Wimax PDU Burst Protocol */
void proto_register_wimax_pdu(void)
{
if (proto_wimax_pdu_decoder == -1)
{
proto_wimax_pdu_decoder = proto_wimax;
register_dissector("wimax_pdu_burst_handler", dissect_wimax_pdu_decoder, -1);
proto_register_field_array(proto_wimax_pdu_decoder, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
proto_register_mac_header_generic();
proto_register_mac_header_type_1();
proto_register_mac_header_type_2();
}
}
static void dissect_wimax_pdu_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint offset;
guint mac_ht, mac_ec;
guint first_byte, length;
guint mac_hcs, mac_hcs_calculated;
proto_item *pdu_item = NULL;
proto_tree *pdu_tree = NULL;
#ifndef STATIC_DATA
/* generate the table of CRC32 remainders for all possible bytes */
wimax_mac_gen_crc32_table();
/* generate the table of CRC8 remainders for all possible bytes */
wimax_mac_gen_crc8_table();
#endif
/* parsing the PDU burst */
for(offset = 0; offset < tvb_reported_length(tvb); )
{
if (offset == 0)
{
first_gmh = TRUE;
}
else
{
first_gmh = FALSE;
}
/* get the length of the remainder */
length = tvb_reported_length_remaining(tvb, offset);
/* get the first byte at offset */
first_byte = tvb_get_guint8(tvb, offset);
/* check for padding */
if(first_byte == WIMAX_PDU_PADDING_MASK)
{ /* Padding */
/* display message */
pdu_item = proto_tree_add_protocol_format(tree, proto_wimax_pdu_decoder, tvb, offset, length, "Padding (%u bytes)", length);
/* add subtree */
pdu_tree = proto_item_add_subtree(pdu_item, ett_wimax_pdu_decoder);
/* display the padding in Hex */
proto_tree_add_item(pdu_tree, hf_wimax_value_bytes, tvb, offset, length, FALSE);
break;
}
else if((first_byte & WIMAX_MAP_TYPE_MASK) == WIMAX_HARQ_MAP_MSG_IND)
{ /* HARQ MAP message (no mac header) */
/* get the HARQ MAp Message Length */
length = ((tvb_get_ntohs(tvb, offset) & WIMAX_HARQ_MAP_MSG_LENGTH_MASK1) >> 2);
if (length == 0)
{
length = 3; /* At least 3 bytes. This prevents endless loop */
}
dissector_wimax_harq_map_decoder(tvb_new_subset(tvb,offset,length,length), pinfo, tree);
offset += length;
continue;
}
else if((first_byte & WIMAX_MAP_TYPE_MASK) == WIMAX_COMPRESSED_DL_MAP_IND)
{
if(is_down_link(&pinfo->src))
{ /* decode compressed dl-map without mac header */
if ((first_byte & REDUCED_PRIVATE_MAP_MASK) == REDUCED_PRIVATE_MAP_MASK)
{
length = wimax_decode_dlmap_reduced_aas(tvb, pinfo, tree);
}
else
{
length = wimax_decode_dlmapc(tvb, pinfo, tree);
}
offset += length;
continue;
}
}
else if((first_byte & WIMAX_INVALID_PDU_MASK) == WIMAX_INVALID_PDU_MASK)
{ /* Invalid PDU */
/* update the info column */
if (check_col(pinfo->cinfo, COL_INFO))
{
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Invalid PDU");
}
/* display message */
pdu_item = proto_tree_add_protocol_format(tree, proto_wimax_pdu_decoder, tvb, offset, length, "Invalid PDU (%u bytes)", length);
/* add subtree */
pdu_tree = proto_item_add_subtree(pdu_item, ett_wimax_pdu_decoder);
/* display the invalid MAC Header in Hex */
proto_tree_add_item(pdu_tree, hf_wimax_value_bytes, tvb, offset, length, FALSE);
break;
}
/* calculate the MAC header HCS */
mac_hcs_calculated = wimax_mac_calc_crc8((guint8 *)tvb_get_ptr(tvb, offset, WIMAX_MAC_HEADER_INFO_FIELDS), WIMAX_MAC_HEADER_INFO_FIELDS);
/* get the Header Check Sequence (HCS) in the header */
mac_hcs = tvb_get_guint8(tvb, offset + WIMAX_MAC_HEADER_SIZE - 1);
/* verify the HCS */
if(mac_hcs != mac_hcs_calculated)
{
/* update the info column */
if (check_col(pinfo->cinfo, COL_INFO))
{
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "MAC Header CRC error");
}
/* display message */
pdu_item = proto_tree_add_protocol_format(tree, proto_wimax_pdu_decoder, tvb, offset, WIMAX_MAC_HEADER_SIZE, "MAC Header CRC error %X (in header) and %X (calculated)", mac_hcs, mac_hcs_calculated);
/* add subtree */
pdu_tree = proto_item_add_subtree(pdu_item, ett_wimax_pdu_decoder);
/* display the bad MAC Header in Hex */
proto_tree_add_item(pdu_tree, hf_wimax_value_bytes, tvb, offset, length, FALSE);
break;
}
/* get the Header Type (HT) */
mac_ht = ((first_byte & WIMAX_MAC_HEADER_HT_FIELD)?1:0);
/* get the Encryption Control (EC) */
mac_ec = ((first_byte & WIMAX_MAC_HEADER_EC_FIELD)?1:0);
/* update the MAC length for Generic MAC frame */
if(!mac_ht)
{ /* Generic MAC Header with payload */
/* get the MAC length */
length = (tvb_get_guint8(tvb, offset+1) & WIMAX_MAC_HEADER_LENGTH_MSB_MASK);
length = ((length<<8) | tvb_get_guint8(tvb, offset+2));
}
else /* MAC signaling Headers or Bandwidth Request Headers */
{ /* set the mac length */
length = WIMAX_MAC_HEADER_SIZE;
}
/* display PDU frame info */
/*
pdu_item = proto_tree_add_protocol_format(tree, proto_wimax_pdu_decoder, tvb, offset, length, "PDU Frame (%u bytes)", length);
*/
pdu_item = proto_tree_add_protocol_format(tree, proto_wimax_pdu_decoder, tvb, offset, length, "PDU (%u bytes)", length);
/* add PDU subtree */
pdu_tree = proto_item_add_subtree(pdu_item, ett_wimax_pdu_decoder);
if (length == 0) {
offset += 6; /* Add header size. */
/* Must skip the code below or tvb_new_subset()
* keeps allocating memory until it runs out. */
continue;
}
/* process the valid MAC header */
if(mac_ht)
{ /* MAC signaling Headers or Bandwidth Request Headers */
/* check the header type */
if(mac_ec)
{ /* MAC Signaling Header Type II Header */
proto_item_append_text(pdu_item, " - Mac Type II Header: ");
dissect_mac_header_type_2_decoder(tvb_new_subset(tvb,offset,length,length), pinfo, pdu_tree);
}
else
{ /* MAC Signaling Header Type I Header */
proto_item_append_text(pdu_item, " - Mac Type I Header: ");
dissect_mac_header_type_1_decoder(tvb_new_subset(tvb,offset,length,length), pinfo, pdu_tree);
}
}
else /* Generic MAC Header with payload */
{
dissect_mac_header_generic_decoder(tvb_new_subset(tvb,offset,length,length), pinfo, pdu_tree);
}
offset += length;
}
}
取自
http://anonsvn.wireshark.org/wireshark/trunk 的
plugins/wimax/wimax_pdu_decoder.c - LGPL - C
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