01844e151a
the number of bytes in the packet or subset of the packet is the reported length, tvb_length() just gives you the amount of that data that was actually captured. Include <glib.h>, not <gmodule.h>, even in plugins. Fix the version numbers in the rc files. svn path=/trunk/; revision=21960
227 lines
8.1 KiB
C
227 lines
8.1 KiB
C
/* wimax_harq_map_decoder.c
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* WiMax HARQ Map Message decoder
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*
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* Copyright (c) 2007 by Intel Corporation.
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*
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* Author: Lu Pan <lu.pan@intel.com>
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*
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* $Id$
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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 1999 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* Include files */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include "crc.h"
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extern guint wimax_compact_dlmap_ie_decoder(proto_tree *tree, packet_info *pinfo, tvbuff_t *tvb, guint offset, guint nibble_offset);
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extern guint wimax_compact_ulmap_ie_decoder(proto_tree *tree, packet_info *pinfo, tvbuff_t *tvb, guint offset, guint nibble_offset);
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extern gint proto_wimax;
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/* forward reference */
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void dissector_wimax_harq_map_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static gint proto_wimax_harq_map_decoder = -1;
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static gint ett_wimax_harq_map_decoder = -1;
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/* Setup protocol subtree array */
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static gint *ett[] =
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{
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&ett_wimax_harq_map_decoder,
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};
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/* MASKs */
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#define LSB_NIBBLE_MASK 0x0F
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/* HARQ MAP masks */
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#define WIMAX_HARQ_MAP_INDICATOR_MASK 0xE00000
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#define WIMAX_HARQ_UL_MAP_APPENDED_MASK 0x100000
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#define WIMAX_HARQ_MAP_RESERVED_MASK 0x080000
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#define WIMAX_HARQ_MAP_MSG_LENGTH_MASK 0x07FC00
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#define WIMAX_HARQ_MAP_DL_IE_COUNT_MASK 0x0003F0
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#define WIMAX_HARQ_MAP_MSG_LENGTH_SHIFT 10
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#define WIMAX_HARQ_MAP_DL_IE_COUNT_SHIFT 4
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/* HARQ MAP display indexies */
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static gint hf_harq_map_indicator = -1;
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static gint hf_harq_ul_map_appended = -1;
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static gint hf_harq_map_reserved = -1;
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static gint hf_harq_map_msg_length = -1;
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static gint hf_harq_dl_ie_count = -1;
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static gint hf_harq_map_msg_crc = -1;
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/* HARQ MAP display */
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static hf_register_info hf_harq_map[] =
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{
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{
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&hf_harq_map_indicator,
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{"HARQ MAP Indicator", "wimax.harq_map.indicator", FT_UINT24, BASE_HEX, NULL, WIMAX_HARQ_MAP_INDICATOR_MASK, "", HFILL}
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},
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{
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&hf_harq_ul_map_appended,
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{"HARQ UL-MAP Appended", "wimax.harq_map.ul_map_appended", FT_UINT24, BASE_HEX, NULL, WIMAX_HARQ_UL_MAP_APPENDED_MASK, "", HFILL}
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},
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{
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&hf_harq_map_reserved,
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{"Reserved", "wimax.harq_map.reserved", FT_UINT24, BASE_HEX, NULL, WIMAX_HARQ_MAP_RESERVED_MASK, "", HFILL}
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},
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{
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&hf_harq_map_msg_length,
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{"Map Message Length", "wimax.harq_map.msg_length", FT_UINT24, BASE_DEC, NULL, WIMAX_HARQ_MAP_MSG_LENGTH_MASK, "", HFILL}
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},
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{
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&hf_harq_dl_ie_count,
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{"DL IE Count", "wimax.harq_map.dl_ie_count", FT_UINT24, BASE_DEC, NULL, WIMAX_HARQ_MAP_DL_IE_COUNT_MASK, "", HFILL}
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},
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{
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&hf_harq_map_msg_crc,
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{"HARQ MAP Message CRC", "wimax.harq_map.msg_crc", FT_UINT32, BASE_HEX, NULL, 0x0, "", HFILL}
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}
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};
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/* Register Wimax HARQ MAP Protocol */
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void proto_register_wimax_harq_map(void)
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{
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if (proto_wimax_harq_map_decoder == -1)
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{
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proto_wimax_harq_map_decoder = proto_wimax;
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proto_register_subtree_array(ett, array_length(ett));
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proto_register_field_array(proto_wimax_harq_map_decoder, hf_harq_map, array_length(hf_harq_map));
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}
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}
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/* HARQ MAP message decoder */
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void dissector_wimax_harq_map_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint i, offset = 0;
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guint tvb_len, length, dl_ie_count;
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guint ie_length;
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proto_item *harq_map_item = NULL;
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proto_tree *harq_map_tree = NULL;
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guint nibble_offset;
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proto_item *parent_item = NULL;
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proto_item *it = NULL;
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guint ulmap_appended;
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guint32 harq_map_msg_crc, calculated_crc;
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guint32 first_24bits;
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/* check the tvb reported length */
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tvb_len = tvb_reported_length(tvb);
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if(!tvb_len)
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{ /* do nothing if tvb is empty */
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return;
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}
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/* Ensure the right payload type */
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first_24bits = tvb_get_ntoh24(tvb, offset);
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if((first_24bits & WIMAX_HARQ_MAP_INDICATOR_MASK) != WIMAX_HARQ_MAP_INDICATOR_MASK)
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{ /* do nothing if tvb is not a HARQ MAP message */
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return;
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}
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/* update the info column */
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if (check_col(pinfo->cinfo, COL_INFO))
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{
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col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "HARQ-MAP Message: ");
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}
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if (tree)
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{ /* we are being asked for details */
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/* get the parent */
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parent_item = proto_tree_get_parent(tree);
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/* display HARQ-MAP Message and create subtree */
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harq_map_item = proto_tree_add_protocol_format(tree, proto_wimax_harq_map_decoder, tvb, offset, tvb_len, "HARQ-MAP Message (%u bytes)", tvb_len);
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harq_map_tree = proto_item_add_subtree(harq_map_item, ett_wimax_harq_map_decoder);
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/* display the HARQ MAP Indicator */
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proto_tree_add_item(harq_map_tree, hf_harq_map_indicator, tvb, offset, 3, FALSE);
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/* display the HARQ MAp UL-MAP Appended */
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proto_tree_add_item(harq_map_tree, hf_harq_ul_map_appended, tvb, offset, 3, FALSE);
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/* display the reserved bit */
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proto_tree_add_item(harq_map_tree, hf_harq_map_reserved, tvb, offset, 3, FALSE);
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/* display the HARQ MAP message length */
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proto_tree_add_item(harq_map_tree, hf_harq_map_msg_length, tvb, offset, 3, FALSE);
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/* display the DL IE count */
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proto_tree_add_item(harq_map_tree, hf_harq_dl_ie_count, tvb, offset, 3, FALSE);
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/* get the message length */
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length = ((first_24bits & WIMAX_HARQ_MAP_MSG_LENGTH_MASK) >> WIMAX_HARQ_MAP_MSG_LENGTH_SHIFT);
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/* get the DL IE count */
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dl_ie_count = ((first_24bits & WIMAX_HARQ_MAP_DL_IE_COUNT_MASK) >> WIMAX_HARQ_MAP_DL_IE_COUNT_SHIFT);
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/* get the UL MAP appended */
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ulmap_appended = (first_24bits & WIMAX_HARQ_UL_MAP_APPENDED_MASK);
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if (parent_item == NULL || parent_item->finfo == NULL)
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{
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parent_item = harq_map_item; /* Prevent crash */
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}
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/* set the offsets to Compact DL-MAP IEs */
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offset += 2;
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nibble_offset = 1;
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/* process the compact dl_map ies */
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for(i=0; i<dl_ie_count; i++)
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{ /* add the DL-MAp IEs info */
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proto_item_append_text(parent_item, " - DL-MAP IEs");
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/* decode Compact DL-MAP IEs */
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ie_length = wimax_compact_dlmap_ie_decoder(harq_map_tree, pinfo, tvb, offset, nibble_offset);
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offset += ((nibble_offset + ie_length) >> 1);
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nibble_offset = ((nibble_offset + ie_length) & 1);
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}
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/* check if there exist the compact ul_map IEs */
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if (ulmap_appended)
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{ /* add the UL-MAp IEs info */
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proto_item_append_text(parent_item, ",UL-MAP IEs");
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/* process the compact ul_map ies */
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while(offset < (length - sizeof(harq_map_msg_crc)))
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{ /* decode Compact UL-MAP IEs */
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ie_length = wimax_compact_ulmap_ie_decoder(harq_map_tree, pinfo, tvb, offset, nibble_offset);
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/* Prevent endless loop with erroneous data. */
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if (ie_length < 2)
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ie_length = 2;
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offset += ((nibble_offset + ie_length) >> 1);
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nibble_offset = ((nibble_offset + ie_length) & 1);
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}
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}
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/* handle the padding */
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if(nibble_offset)
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{
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/* add the Padding info */
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proto_item_append_text(parent_item, ",Padding");
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proto_tree_add_protocol_format(harq_map_tree, proto_wimax_harq_map_decoder, tvb, offset, 1, "Padding Nibble: 0x%x", (tvb_get_guint8(tvb, offset) & LSB_NIBBLE_MASK));
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}
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/* add the CRC info */
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proto_item_append_text(parent_item, ",CRC");
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/* get the CRC */
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harq_map_msg_crc = tvb_get_ntohl(tvb, length - sizeof(harq_map_msg_crc));
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/* calculate the HARQ MAM Message CRC */
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calculated_crc = wimax_mac_calc_crc32((guint8 *)tvb_get_ptr(tvb, 0, length - sizeof(harq_map_msg_crc)), length - sizeof(harq_map_msg_crc));
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/* display the CRC */
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it = proto_tree_add_item(harq_map_tree, hf_harq_map_msg_crc, tvb, length - sizeof(harq_map_msg_crc), sizeof(harq_map_msg_crc), FALSE);
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/* verify the CRC */
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if (harq_map_msg_crc != calculated_crc)
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{
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proto_item_append_text(it, " - incorrect! (should be: 0x%x)", calculated_crc);
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}
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}
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}
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