radiotap_iter.h

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//
// Copyright (c) 2020 Fraunhofer Institute for Applied Information Technology (FIT)
//                    Network Research Group (NET)
//                    Schloss Birlinghoven, 53754 Sankt Augustin, GERMANY
//                    Contact: support@wiback.org
//
// This file is part of the SENF code tree.
// It is licensed under the 3-clause BSD License (aka New BSD License).
// See LICENSE.txt in the top level directory for details or visit
// https://opensource.org/licenses/BSD-3-Clause
//


#ifndef __RADIOTAP_ITER_H
#define __RADIOTAP_ITER_H

#include <stdint.h>
#include "radiotap.h"

/* Radiotap header iteration
 *   implemented in radiotap.c
 */

struct radiotap_override {
    uint8_t field;
    uint8_t align:4, size:4;
};

struct radiotap_align_size {
    uint8_t 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 {
    struct ieee80211_radiotap_header *_rtheader;
    const struct ieee80211_radiotap_vendor_namespaces *_vns;
    const struct ieee80211_radiotap_namespace *current_namespace;

    unsigned char *_arg, *_next_ns_data;
    uint32_t *_next_bitmap;

    unsigned char *this_arg;
    const struct radiotap_override *overrides;  /* Only for RADIOTAP_SUPPORT_OVERRIDES */
    int n_overrides;                /* Only for RADIOTAP_SUPPORT_OVERRIDES */
    int this_arg_index;
    int this_arg_size;

    int is_radiotap_ns;

    int _max_length;
    int _arg_index;
    uint32_t _bitmap_shifter;
    int _reset_on_ext;
};

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 */