Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 1 | #ifndef __RADIOTAP_ITER_H |
| 2 | #define __RADIOTAP_ITER_H |
| 3 | |
Dmitry Shmidt | 7dba0e5 | 2014-04-14 10:49:15 -0700 | [diff] [blame] | 4 | #include <stdint.h> |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 5 | #include "radiotap.h" |
| 6 | |
| 7 | /* Radiotap header iteration |
| 8 | * implemented in radiotap.c |
| 9 | */ |
Dmitry Shmidt | 7dba0e5 | 2014-04-14 10:49:15 -0700 | [diff] [blame] | 10 | |
| 11 | struct radiotap_override { |
| 12 | uint8_t field; |
| 13 | uint8_t align:4, size:4; |
| 14 | }; |
| 15 | |
| 16 | struct radiotap_align_size { |
| 17 | uint8_t align:4, size:4; |
| 18 | }; |
| 19 | |
| 20 | struct ieee80211_radiotap_namespace { |
| 21 | const struct radiotap_align_size *align_size; |
| 22 | int n_bits; |
| 23 | uint32_t oui; |
| 24 | uint8_t subns; |
| 25 | }; |
| 26 | |
| 27 | struct ieee80211_radiotap_vendor_namespaces { |
| 28 | const struct ieee80211_radiotap_namespace *ns; |
| 29 | int n_ns; |
| 30 | }; |
| 31 | |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 32 | /** |
| 33 | * struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args |
Dmitry Shmidt | 7dba0e5 | 2014-04-14 10:49:15 -0700 | [diff] [blame] | 34 | * @this_arg_index: index of current arg, valid after each successful call |
| 35 | * to ieee80211_radiotap_iterator_next() |
| 36 | * @this_arg: pointer to current radiotap arg; it is valid after each |
| 37 | * call to ieee80211_radiotap_iterator_next() but also after |
| 38 | * ieee80211_radiotap_iterator_init() where it will point to |
| 39 | * the beginning of the actual data portion |
| 40 | * @this_arg_size: length of the current arg, for convenience |
| 41 | * @current_namespace: pointer to the current namespace definition |
| 42 | * (or internally %NULL if the current namespace is unknown) |
| 43 | * @is_radiotap_ns: indicates whether the current namespace is the default |
| 44 | * radiotap namespace or not |
| 45 | * |
| 46 | * @overrides: override standard radiotap fields |
| 47 | * @n_overrides: number of overrides |
| 48 | * |
| 49 | * @_rtheader: pointer to the radiotap header we are walking through |
| 50 | * @_max_length: length of radiotap header in cpu byte ordering |
| 51 | * @_arg_index: next argument index |
| 52 | * @_arg: next argument pointer |
| 53 | * @_next_bitmap: internal pointer to next present u32 |
| 54 | * @_bitmap_shifter: internal shifter for curr u32 bitmap, b0 set == arg present |
| 55 | * @_vns: vendor namespace definitions |
| 56 | * @_next_ns_data: beginning of the next namespace's data |
| 57 | * @_reset_on_ext: internal; reset the arg index to 0 when going to the |
| 58 | * next bitmap word |
| 59 | * |
| 60 | * Describes the radiotap parser state. Fields prefixed with an underscore |
| 61 | * must not be used by users of the parser, only by the parser internally. |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 62 | */ |
| 63 | |
| 64 | struct ieee80211_radiotap_iterator { |
Dmitry Shmidt | 7dba0e5 | 2014-04-14 10:49:15 -0700 | [diff] [blame] | 65 | struct ieee80211_radiotap_header *_rtheader; |
| 66 | const struct ieee80211_radiotap_vendor_namespaces *_vns; |
| 67 | const struct ieee80211_radiotap_namespace *current_namespace; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 68 | |
Dmitry Shmidt | 7dba0e5 | 2014-04-14 10:49:15 -0700 | [diff] [blame] | 69 | unsigned char *_arg, *_next_ns_data; |
| 70 | uint32_t *_next_bitmap; |
| 71 | |
| 72 | unsigned char *this_arg; |
| 73 | #ifdef RADIOTAP_SUPPORT_OVERRIDES |
| 74 | const struct radiotap_override *overrides; |
| 75 | int n_overrides; |
| 76 | #endif |
| 77 | int this_arg_index; |
| 78 | int this_arg_size; |
| 79 | |
| 80 | int is_radiotap_ns; |
| 81 | |
| 82 | int _max_length; |
| 83 | int _arg_index; |
| 84 | uint32_t _bitmap_shifter; |
| 85 | int _reset_on_ext; |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 86 | }; |
| 87 | |
| 88 | extern int ieee80211_radiotap_iterator_init( |
Dmitry Shmidt | 7dba0e5 | 2014-04-14 10:49:15 -0700 | [diff] [blame] | 89 | struct ieee80211_radiotap_iterator *iterator, |
| 90 | struct ieee80211_radiotap_header *radiotap_header, |
| 91 | int max_length, const struct ieee80211_radiotap_vendor_namespaces *vns); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 92 | |
| 93 | extern int ieee80211_radiotap_iterator_next( |
Dmitry Shmidt | 7dba0e5 | 2014-04-14 10:49:15 -0700 | [diff] [blame] | 94 | struct ieee80211_radiotap_iterator *iterator); |
Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame] | 95 | |
| 96 | #endif /* __RADIOTAP_ITER_H */ |