forked from osmocom/wireshark
89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/*
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* Radiotap parser
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*
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* Copyright 2007 Andy Green <andy@warmcat.com>
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*
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* SPDX-License-Identifier: (ISC OR GPL-2.0-only)
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*/
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#ifndef __RADIOTAP_ITER_H
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#define __RADIOTAP_ITER_H
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#define RADIOTAP_SUPPORT_OVERRIDES
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#include <glib.h>
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#include "packet-ieee80211-radiotap-defs.h"
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/* Radiotap header iteration
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* implemented in radiotap.c
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*/
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struct radiotap_override {
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guint8 field;
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guint align:4, size:4;
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};
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struct radiotap_align_size {
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guint align:4, size:4;
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};
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struct ieee80211_radiotap_namespace {
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const struct radiotap_align_size *align_size;
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int n_bits;
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guint32 oui;
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guint8 subns;
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};
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struct ieee80211_radiotap_vendor_namespaces {
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const struct ieee80211_radiotap_namespace *ns;
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int n_ns;
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};
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/**
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* struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args
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*
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* Describes the radiotap parser state. Fields prefixed with an underscore
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* must not be used by users of the parser, only by the parser internally.
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*/
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struct ieee80211_radiotap_iterator {
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struct ieee80211_radiotap_header *_rtheader; /**< pointer to the radiotap header we are walking through */
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const struct ieee80211_radiotap_vendor_namespaces *_vns; /**< vendor namespace definitions*/
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const struct ieee80211_radiotap_namespace *current_namespace; /**< pointer to the current namespace definition (or internally
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%NULL if the current namespace is unknown)*/
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unsigned char *_arg, *_next_ns_data; /**< beginning of the next namespace's data */
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guint32 *_next_bitmap; /**< internal pointer to next present u32 */
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unsigned char *this_arg; /**< pointer to current radiotap arg; it is valid after each call
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to ieee80211_radiotap_iterator_next() but also after
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ieee80211_radiotap_iterator_init() where it will point to
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the beginning of the actual data portion */
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#ifdef RADIOTAP_SUPPORT_OVERRIDES
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const struct radiotap_override *overrides; /**< override standard radiotap fields */
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int n_overrides; /**< number of overrides */
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#endif
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int this_arg_index; /**< index of current arg, valid after each successful call to
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ieee80211_radiotap_iterator_next() */
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int this_arg_size; /**< length of the current arg, for convenience*/
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int is_radiotap_ns;
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int tlv_mode;
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int _max_length; /**< length of radiotap header in cpu byte ordering */
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int _arg_index; /**< next argument index */
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guint32 _bitmap_shifter; /**< internal shifter for curr u32 bitmap, b0 set == arg present */
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int _reset_on_ext; /**< internal; reset the arg index to 0 when going to the next bitmap word */
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};
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extern int ieee80211_radiotap_iterator_init(
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struct ieee80211_radiotap_iterator *iterator,
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struct ieee80211_radiotap_header *radiotap_header,
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int max_length, const struct ieee80211_radiotap_vendor_namespaces *vns);
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extern int ieee80211_radiotap_iterator_next(
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struct ieee80211_radiotap_iterator *iterator);
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#endif /* __RADIOTAP_ITER_H */
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