1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* Copyright (c) 2007, 2008, Andy Green <andy@warmcat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define __user
#include "byteorder.h"
#include <stdint.h>
typedef uint64_t u64;
typedef uint32_t u32;
typedef uint16_t u16;
typedef uint8_t u8;
#ifndef unlikely
#define unlikely(x) (x)
#endif
#include "ieee80211_radiotap.h"
/*
* Radiotap header iteration
* implemented in src/radiotap-parser.c
*
* call __ieee80211_radiotap_iterator_init() to init a semi-opaque iterator
* struct ieee80211_radiotap_iterator (no need to init the struct beforehand)
* then loop calling __ieee80211_radiotap_iterator_next()... it returns -1
* if there are no more args in the header, or the next argument type index
* that is present. The iterator's this_arg member points to the start of the
* argument associated with the current argument index that is present,
* which can be found in the iterator's this_arg_index member. This arg
* index corresponds to the IEEE80211_RADIOTAP_... defines.
*/
/**
* struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args
* @rtheader: pointer to the radiotap header we are walking through
* @max_length: length of radiotap header in cpu byte ordering
* @this_arg_index: IEEE80211_RADIOTAP_... index of current arg
* @this_arg: pointer to current radiotap arg
* @arg_index: internal next argument index
* @arg: internal next argument pointer
* @next_bitmap: internal pointer to next present u32
* @bitmap_shifter: internal shifter for curr u32 bitmap, b0 set == arg present
*/
struct ieee80211_radiotap_iterator {
struct ieee80211_radiotap_header *rtheader;
int max_length;
int this_arg_index;
u8 * this_arg;
int arg_index;
u8 * arg;
u32 *next_bitmap;
u32 bitmap_shifter;
};
int ieee80211_radiotap_iterator_init(
struct ieee80211_radiotap_iterator * iterator,
struct ieee80211_radiotap_header * radiotap_header,
int max_length);
int ieee80211_radiotap_iterator_next(
struct ieee80211_radiotap_iterator * iterator);
|
