176 lines
5.9 KiB
C
176 lines
5.9 KiB
C
/* wimax_tlv.c
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* WiMax TLV handling functions
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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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* 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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include "wimax_tlv.h"
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/*************************************************************/
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/* init_tlv_info() */
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/* retrive the tlv information from specified tvb and offset */
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/* parameter: */
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/* info - pointer of a tlv information data structure */
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/* return: */
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/* 0-success */
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/* !=0-the invalid size of the TLV length (failed) */
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/*************************************************************/
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gint init_tlv_info(tlv_info_t *info, tvbuff_t *tvb, gint offset)
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{
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guint tlv_len;
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/* get TLV type */
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info->type = (guint8)tvb_get_guint8( tvb, offset );
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/* get TLV length */
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tlv_len = (guint)tvb_get_guint8( tvb, (offset + 1) );
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/* set the TLV value offset */
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info->value_offset = 2;
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/* adjust for multiple-byte TLV length */
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if((tlv_len & WIMAX_TLV_EXTENDED_LENGTH_MASK) != 0)
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{ /* multiple bytes TLV length */
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info->length_type = 1;
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/* get the size of the TLV length */
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tlv_len = (tlv_len & WIMAX_TLV_LENGTH_MASK);
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info->size_of_length = tlv_len;
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/* update the TLV value offset */
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info->value_offset += tlv_len;
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switch (tlv_len)
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{
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case 0:
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info->length = 0; /* no length */
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break;
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case 1:
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info->length = (gint32)tvb_get_guint8( tvb, (offset + 2) ); /* 8 bit */
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break;
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case 2:
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info->length = (gint32)tvb_get_ntohs( tvb, (offset + 2) ); /* 16 bit */
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break;
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case 3:
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info->length = (gint32)tvb_get_ntoh24( tvb, (offset + 2) ); /* 24 bit */
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break;
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case 4:
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info->length = (gint32)tvb_get_ntohl( tvb, (offset + 2) ); /* 32 bit */
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break;
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default:
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/* mark invalid tlv */
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info->valid = 0;
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/* failed, return the invalid size of the tlv length */
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return (gint)tlv_len;
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break;
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}
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}
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else /* single byte length */
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{
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info->length_type = 0;
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info->size_of_length = 0;
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info->length = (gint32)tlv_len;
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}
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/* mark valid tlv */
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info->valid = 1;
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/* success */
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return 0;
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}
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/*************************************************************/
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/* get_tlv_type() */
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/* get the tlv type of the specified tlv information */
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/* parameter: */
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/* info - pointer of a tlv information data structure */
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/* return: */
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/* >=0 - TLV type */
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/* =-1 - invalid tlv info */
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/*************************************************************/
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gint get_tlv_type(tlv_info_t *info)
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{
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if(info->valid)
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return (gint)info->type;
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return -1;
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}
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/**************************************************************/
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/* get_tlv_size_of_length() */
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/* get the size of tlv length of the specified tlv information*/
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/* parameter: */
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/* info - pointer of a tlv information data structure */
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/* return: */
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/* >=0 - the size of TLV length */
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/* =-1 - invalid tlv info */
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/**************************************************************/
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gint get_tlv_size_of_length(tlv_info_t *info)
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{
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if(info->valid)
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return (gint)info->size_of_length;
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return -1;
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}
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/*************************************************************/
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/* get_tlv_length() */
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/* get the tlv length of the specified tlv information */
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/* parameter: */
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/* info - pointer of a tlv information data structure */
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/* return: */
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/* >=0 - TLV length */
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/* =-1 - invalid tlv info */
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/*************************************************************/
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gint32 get_tlv_length(tlv_info_t *info)
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{
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if(info->valid)
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return (gint32)info->length;
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return -1;
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}
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/*************************************************************/
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/* get_tlv_value_offset() */
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/* get the tlv value offset of the specified tlv information */
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/* parameter: */
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/* info - pointer of a tlv information data structure */
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/* return: */
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/* >0 - TLV value offset in byte */
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/* =-1 - invalid tlv info */
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/*************************************************************/
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gint get_tlv_value_offset(tlv_info_t *info)
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{
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if(info->valid)
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return (gint)info->value_offset;
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return -1;
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}
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/*************************************************************/
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/* get_tlv_length_type() */
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/* get the tlv length type of the specified tlv information */
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/* parameter: */
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/* info - pointer of a tlv information data structure */
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/* return: */
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/* 0 - single byte TLV length */
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/* 1 - multiple bytes TLV length */
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/*************************************************************/
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gint get_tlv_length_type(tlv_info_t *info)
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{
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if(info->valid)
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return (gint)info->length_type;
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return -1;
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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