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/*
* Radiotap parser
*
* Copyright 2007 Andy Green <andy@warmcat.com>
* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
*
* SPDX-License-Identifier: (ISC OR GPL-2.0-only)
*/
#ifndef __RADIOTAP_ITER_H
#define __RADIOTAP_ITER_H
#define RADIOTAP_SUPPORT_OVERRIDES
#include "packet-ieee80211-radiotap-defs.h"
/* Radiotap header iteration
* implemented in radiotap.c
*/
struct radiotap_override {
uint8_t field;
unsigned align:4, size:4;
};
struct radiotap_align_size {
unsigned align:4, size:4;
};
struct ieee80211_radiotap_namespace {
const struct radiotap_align_size *align_size;
int n_bits;
uint32_t oui;
uint8_t subns;
};
struct ieee80211_radiotap_vendor_namespaces {
const struct ieee80211_radiotap_namespace *ns;
int n_ns;
};
/**
* struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args
*
* Describes the radiotap parser state. Fields prefixed with an underscore
* must not be used by users of the parser, only by the parser internally.
*/
struct ieee80211_radiotap_iterator {
struct ieee80211_radiotap_header *_rtheader; /**< pointer to the radiotap header we are walking through */
const struct ieee80211_radiotap_vendor_namespaces *_vns; /**< vendor namespace definitions*/
const struct ieee80211_radiotap_namespace *current_namespace; /**< pointer to the current namespace definition (or internally
%NULL if the current namespace is unknown)*/
unsigned char *_arg, *_next_ns_data; /**< beginning of the next namespace's data */
uint32_t *_next_bitmap; /**< internal pointer to next present u32 */
unsigned char *this_arg; /**< pointer to current radiotap arg; it is valid after each call
to ieee80211_radiotap_iterator_next() but also after
ieee80211_radiotap_iterator_init() where it will point to
the beginning of the actual data portion */
#ifdef RADIOTAP_SUPPORT_OVERRIDES
const struct radiotap_override *overrides; /**< override standard radiotap fields */
int n_overrides; /**< number of overrides */
#endif
int this_arg_index; /**< index of current arg, valid after each successful call to
ieee80211_radiotap_iterator_next() */
int this_arg_size; /**< length of the current arg, for convenience*/
int is_radiotap_ns;
int tlv_mode;
int _max_length; /**< length of radiotap header in cpu byte ordering */
int _arg_index; /**< next argument index */
uint32_t _bitmap_shifter; /**< internal shifter for curr u32 bitmap, b0 set == arg present */
int _reset_on_ext; /**< internal; reset the arg index to 0 when going to the next bitmap word */
};
extern int ieee80211_radiotap_iterator_init(
struct ieee80211_radiotap_iterator *iterator,
struct ieee80211_radiotap_header *radiotap_header,
int max_length, const struct ieee80211_radiotap_vendor_namespaces *vns);
extern int ieee80211_radiotap_iterator_next(
struct ieee80211_radiotap_iterator *iterator);
#endif /* __RADIOTAP_ITER_H */
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