diff options
Diffstat (limited to 'plugins/epan/wimax/wimax_tlv.c')
| -rw-r--r-- | plugins/epan/wimax/wimax_tlv.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/plugins/epan/wimax/wimax_tlv.c b/plugins/epan/wimax/wimax_tlv.c new file mode 100644 index 0000000..fe06728 --- /dev/null +++ b/plugins/epan/wimax/wimax_tlv.c @@ -0,0 +1,175 @@ +/* wimax_tlv.c + * WiMax TLV handling functions + * + * 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 "config.h" + +#include "wimax_tlv.h" + +/*************************************************************/ +/* init_tlv_info() */ +/* retrive the tlv information from specified tvb and offset */ +/* parameter: */ +/* info - pointer of a tlv information data structure */ +/* return: */ +/* 0-success */ +/* !=0-the invalid size of the TLV length (failed) */ +/*************************************************************/ +gint init_tlv_info(tlv_info_t *info, tvbuff_t *tvb, gint offset) +{ + guint tlv_len; + + /* get TLV type */ + info->type = (guint8)tvb_get_guint8( tvb, offset ); + /* get TLV length */ + tlv_len = (guint)tvb_get_guint8( tvb, (offset + 1) ); + /* set the TLV value offset */ + info->value_offset = 2; + /* adjust for multiple-byte TLV length */ + if((tlv_len & WIMAX_TLV_EXTENDED_LENGTH_MASK) != 0) + { /* multiple bytes TLV length */ + info->length_type = 1; + /* get the size of the TLV length */ + tlv_len = (tlv_len & WIMAX_TLV_LENGTH_MASK); + info->size_of_length = tlv_len; + /* update the TLV value offset */ + info->value_offset += tlv_len; + switch (tlv_len) + { + case 0: + info->length = 0; /* no length */ + break; + case 1: + info->length = (gint32)tvb_get_guint8( tvb, (offset + 2) ); /* 8 bit */ + break; + case 2: + info->length = (gint32)tvb_get_ntohs( tvb, (offset + 2) ); /* 16 bit */ + break; + case 3: + info->length = (gint32)tvb_get_ntoh24( tvb, (offset + 2) ); /* 24 bit */ + break; + case 4: + info->length = (gint32)tvb_get_ntohl( tvb, (offset + 2) ); /* 32 bit */ + break; + default: + /* mark invalid tlv */ + info->valid = 0; + /* failed, return the invalid size of the tlv length */ + return (gint)tlv_len; + break; + } + } + else /* single byte length */ + { + info->length_type = 0; + info->size_of_length = 0; + info->length = (gint32)tlv_len; + } + /* mark valid tlv */ + info->valid = 1; + /* success */ + return 0; +} + +/*************************************************************/ +/* get_tlv_type() */ +/* get the tlv type of the specified tlv information */ +/* parameter: */ +/* info - pointer of a tlv information data structure */ +/* return: */ +/* >=0 - TLV type */ +/* =-1 - invalid tlv info */ +/*************************************************************/ +gint get_tlv_type(tlv_info_t *info) +{ + if(info->valid) + return (gint)info->type; + return -1; +} + +/**************************************************************/ +/* get_tlv_size_of_length() */ +/* get the size of tlv length of the specified tlv information*/ +/* parameter: */ +/* info - pointer of a tlv information data structure */ +/* return: */ +/* >=0 - the size of TLV length */ +/* =-1 - invalid tlv info */ +/**************************************************************/ +gint get_tlv_size_of_length(tlv_info_t *info) +{ + if(info->valid) + return (gint)info->size_of_length; + return -1; +} + +/*************************************************************/ +/* get_tlv_length() */ +/* get the tlv length of the specified tlv information */ +/* parameter: */ +/* info - pointer of a tlv information data structure */ +/* return: */ +/* >=0 - TLV length */ +/* =-1 - invalid tlv info */ +/*************************************************************/ +gint32 get_tlv_length(tlv_info_t *info) +{ + if(info->valid) + return (gint32)info->length; + return -1; +} + +/*************************************************************/ +/* get_tlv_value_offset() */ +/* get the tlv value offset of the specified tlv information */ +/* parameter: */ +/* info - pointer of a tlv information data structure */ +/* return: */ +/* >0 - TLV value offset in byte */ +/* =-1 - invalid tlv info */ +/*************************************************************/ +gint get_tlv_value_offset(tlv_info_t *info) +{ + if(info->valid) + return (gint)info->value_offset; + return -1; +} + +/*************************************************************/ +/* get_tlv_length_type() */ +/* get the tlv length type of the specified tlv information */ +/* parameter: */ +/* info - pointer of a tlv information data structure */ +/* return: */ +/* 0 - single byte TLV length */ +/* 1 - multiple bytes TLV length */ +/*************************************************************/ +gint get_tlv_length_type(tlv_info_t *info) +{ + if(info->valid) + return (gint)info->length_type; + return -1; +} + +/* + * 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: + */ |