Michael Büsch
17 years ago
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939ceadf76
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/*
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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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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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* |
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* Alternatively, this software may be distributed under the terms of BSD |
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* license. |
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* |
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* See README and COPYING for more details. |
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* |
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* |
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* Modified for userspace by Johannes Berg <johannes@sipsolutions.net> |
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* I only modified some things on top to ease syncing should bugs be found. |
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*/ |
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#include "includes.h" |
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#include "common.h" |
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#include "radiotap_iter.h" |
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#define le16_to_cpu le_to_host16 |
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#define le32_to_cpu le_to_host32 |
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#define __le32 uint32_t |
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#define ulong unsigned long |
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#define unlikely(cond) (cond) |
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#define get_unaligned(p) \ |
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({ \
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struct packed_dummy_struct { \
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typeof(*(p)) __val; \
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} __attribute__((packed)) *__ptr = (void *) (p); \
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\
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__ptr->__val; \
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}) |
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/* function prototypes and related defs are in radiotap_iter.h */ |
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/**
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* ieee80211_radiotap_iterator_init - radiotap parser iterator initialization |
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* @iterator: radiotap_iterator to initialize |
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* @radiotap_header: radiotap header to parse |
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* @max_length: total length we can parse into (eg, whole packet length) |
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* |
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* Returns: 0 or a negative error code if there is a problem. |
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* |
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* This function initializes an opaque iterator struct which can then |
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* be passed to ieee80211_radiotap_iterator_next() to visit every radiotap |
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* argument which is present in the header. It knows about extended |
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* present headers and handles them. |
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* |
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* How to use: |
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* call __ieee80211_radiotap_iterator_init() to init a semi-opaque iterator |
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* struct ieee80211_radiotap_iterator (no need to init the struct beforehand) |
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* checking for a good 0 return code. Then loop calling |
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* __ieee80211_radiotap_iterator_next()... it returns either 0, |
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* -ENOENT if there are no more args to parse, or -EINVAL if there is a problem. |
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* The iterator's @this_arg member points to the start of the argument |
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* associated with the current argument index that is present, which can be |
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* found in the iterator's @this_arg_index member. This arg index corresponds |
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* to the IEEE80211_RADIOTAP_... defines. |
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* |
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* Radiotap header length: |
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* You can find the CPU-endian total radiotap header length in |
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* iterator->max_length after executing ieee80211_radiotap_iterator_init() |
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* successfully. |
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* |
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* Alignment Gotcha: |
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* You must take care when dereferencing iterator.this_arg |
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* for multibyte types... the pointer is not aligned. Use |
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* get_unaligned((type *)iterator.this_arg) to dereference |
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* iterator.this_arg for type "type" safely on all arches. |
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* |
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* Example code: |
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* See Documentation/networking/radiotap-headers.txt |
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*/ |
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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) |
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{ |
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/* Linux only supports version 0 radiotap format */ |
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if (radiotap_header->it_version) |
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return -EINVAL; |
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/* sanity check for allowed length and radiotap length field */ |
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if (max_length < le16_to_cpu(get_unaligned(&radiotap_header->it_len))) |
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return -EINVAL; |
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iterator->rtheader = radiotap_header; |
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iterator->max_length = le16_to_cpu(get_unaligned( |
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&radiotap_header->it_len)); |
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iterator->arg_index = 0; |
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iterator->bitmap_shifter = le32_to_cpu(get_unaligned( |
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&radiotap_header->it_present)); |
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iterator->arg = (u8 *)radiotap_header + sizeof(*radiotap_header); |
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iterator->this_arg = NULL; |
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/* find payload start allowing for extended bitmap(s) */ |
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if (unlikely(iterator->bitmap_shifter & (1<<IEEE80211_RADIOTAP_EXT))) { |
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while (le32_to_cpu(get_unaligned((__le32 *)iterator->arg)) & |
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(1<<IEEE80211_RADIOTAP_EXT)) { |
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iterator->arg += sizeof(u32); |
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/*
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* check for insanity where the present bitmaps |
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* keep claiming to extend up to or even beyond the |
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* stated radiotap header length |
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*/ |
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if (((ulong)iterator->arg - (ulong)iterator->rtheader) |
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> (ulong)iterator->max_length) |
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return -EINVAL; |
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} |
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iterator->arg += sizeof(u32); |
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/*
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* no need to check again for blowing past stated radiotap |
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* header length, because ieee80211_radiotap_iterator_next |
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* checks it before it is dereferenced |
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*/ |
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} |
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/* we are all initialized happily */ |
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return 0; |
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} |
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/**
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* ieee80211_radiotap_iterator_next - return next radiotap parser iterator arg |
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* @iterator: radiotap_iterator to move to next arg (if any) |
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* |
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* Returns: 0 if there is an argument to handle, |
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* -ENOENT if there are no more args or -EINVAL |
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* if there is something else wrong. |
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* |
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* This function provides the next radiotap arg index (IEEE80211_RADIOTAP_*) |
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* in @this_arg_index and sets @this_arg to point to the |
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* payload for the field. It takes care of alignment handling and extended |
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* present fields. @this_arg can be changed by the caller (eg, |
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* incremented to move inside a compound argument like |
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* IEEE80211_RADIOTAP_CHANNEL). The args pointed to are in |
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* little-endian format whatever the endianess of your CPU. |
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* |
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* Alignment Gotcha: |
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* You must take care when dereferencing iterator.this_arg |
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* for multibyte types... the pointer is not aligned. Use |
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* get_unaligned((type *)iterator.this_arg) to dereference |
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* iterator.this_arg for type "type" safely on all arches. |
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*/ |
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int ieee80211_radiotap_iterator_next( |
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struct ieee80211_radiotap_iterator *iterator) |
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{ |
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/*
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* small length lookup table for all radiotap types we heard of |
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* starting from b0 in the bitmap, so we can walk the payload |
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* area of the radiotap header |
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* |
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* There is a requirement to pad args, so that args |
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* of a given length must begin at a boundary of that length |
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* -- but note that compound args are allowed (eg, 2 x u16 |
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* for IEEE80211_RADIOTAP_CHANNEL) so total arg length is not |
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* a reliable indicator of alignment requirement. |
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* |
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* upper nybble: content alignment for arg |
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* lower nybble: content length for arg |
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*/ |
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static const u8 rt_sizes[] = { |
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[IEEE80211_RADIOTAP_TSFT] = 0x88, |
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[IEEE80211_RADIOTAP_FLAGS] = 0x11, |
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[IEEE80211_RADIOTAP_RATE] = 0x11, |
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[IEEE80211_RADIOTAP_CHANNEL] = 0x24, |
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[IEEE80211_RADIOTAP_FHSS] = 0x22, |
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[IEEE80211_RADIOTAP_DBM_ANTSIGNAL] = 0x11, |
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[IEEE80211_RADIOTAP_DBM_ANTNOISE] = 0x11, |
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[IEEE80211_RADIOTAP_LOCK_QUALITY] = 0x22, |
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[IEEE80211_RADIOTAP_TX_ATTENUATION] = 0x22, |
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[IEEE80211_RADIOTAP_DB_TX_ATTENUATION] = 0x22, |
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[IEEE80211_RADIOTAP_DBM_TX_POWER] = 0x11, |
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[IEEE80211_RADIOTAP_ANTENNA] = 0x11, |
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[IEEE80211_RADIOTAP_DB_ANTSIGNAL] = 0x11, |
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[IEEE80211_RADIOTAP_DB_ANTNOISE] = 0x11, |
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[IEEE80211_RADIOTAP_RX_FLAGS] = 0x22, |
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[IEEE80211_RADIOTAP_TX_FLAGS] = 0x22, |
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[IEEE80211_RADIOTAP_RTS_RETRIES] = 0x11, |
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[IEEE80211_RADIOTAP_DATA_RETRIES] = 0x11, |
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/*
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* add more here as they are defined in |
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* include/net/ieee80211_radiotap.h |
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*/ |
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}; |
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/*
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* for every radiotap entry we can at |
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* least skip (by knowing the length)... |
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*/ |
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while (iterator->arg_index < (int) sizeof(rt_sizes)) { |
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int hit = 0; |
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int pad; |
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if (!(iterator->bitmap_shifter & 1)) |
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goto next_entry; /* arg not present */ |
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/*
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* arg is present, account for alignment padding |
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* 8-bit args can be at any alignment |
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* 16-bit args must start on 16-bit boundary |
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* 32-bit args must start on 32-bit boundary |
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* 64-bit args must start on 64-bit boundary |
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* |
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* note that total arg size can differ from alignment of |
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* elements inside arg, so we use upper nybble of length |
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* table to base alignment on |
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* |
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* also note: these alignments are ** relative to the |
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* start of the radiotap header **. There is no guarantee |
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* that the radiotap header itself is aligned on any |
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* kind of boundary. |
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* |
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* the above is why get_unaligned() is used to dereference |
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* multibyte elements from the radiotap area |
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*/ |
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pad = (((ulong)iterator->arg) - |
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((ulong)iterator->rtheader)) & |
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((rt_sizes[iterator->arg_index] >> 4) - 1); |
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if (pad) |
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iterator->arg += |
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(rt_sizes[iterator->arg_index] >> 4) - pad; |
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/*
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* this is what we will return to user, but we need to |
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* move on first so next call has something fresh to test |
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*/ |
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iterator->this_arg_index = iterator->arg_index; |
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iterator->this_arg = iterator->arg; |
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hit = 1; |
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/* internally move on the size of this arg */ |
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iterator->arg += rt_sizes[iterator->arg_index] & 0x0f; |
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/*
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* check for insanity where we are given a bitmap that |
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* claims to have more arg content than the length of the |
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* radiotap section. We will normally end up equalling this |
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* max_length on the last arg, never exceeding it. |
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*/ |
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if (((ulong)iterator->arg - (ulong)iterator->rtheader) > |
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(ulong) iterator->max_length) |
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return -EINVAL; |
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next_entry: |
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iterator->arg_index++; |
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if (unlikely((iterator->arg_index & 31) == 0)) { |
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/* completed current u32 bitmap */ |
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if (iterator->bitmap_shifter & 1) { |
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/* b31 was set, there is more */ |
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/* move to next u32 bitmap */ |
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iterator->bitmap_shifter = le32_to_cpu( |
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get_unaligned(iterator->next_bitmap)); |
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iterator->next_bitmap++; |
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} else |
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/* no more bitmaps: end */ |
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iterator->arg_index = sizeof(rt_sizes); |
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} else /* just try the next bit */ |
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iterator->bitmap_shifter >>= 1; |
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/* if we found a valid arg earlier, return it now */ |
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if (hit) |
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return 0; |
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} |
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/* we don't know how to handle any more args, we're done */ |
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return -ENOENT; |
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} |
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@ -0,0 +1,242 @@ |
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/* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5 2005/01/22 20:12:05 sam Exp $ */ |
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/* $NetBSD: ieee80211_radiotap.h,v 1.11 2005/06/22 06:16:02 dyoung Exp $ */ |
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/*-
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* Copyright (c) 2003, 2004 David Young. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of David Young may not be used to endorse or promote |
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* products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID |
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* YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
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* OF SUCH DAMAGE. |
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*/ |
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/*
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* Modifications to fit into the linux IEEE 802.11 stack, |
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* Mike Kershaw (dragorn@kismetwireless.net) |
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*/ |
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#ifndef IEEE80211RADIOTAP_H |
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#define IEEE80211RADIOTAP_H |
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#include <stdint.h> |
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/* Base version of the radiotap packet header data */ |
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#define PKTHDR_RADIOTAP_VERSION 0 |
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/* A generic radio capture format is desirable. There is one for
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* Linux, but it is neither rigidly defined (there were not even |
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* units given for some fields) nor easily extensible. |
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* |
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* I suggest the following extensible radio capture format. It is |
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* based on a bitmap indicating which fields are present. |
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* |
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* I am trying to describe precisely what the application programmer |
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* should expect in the following, and for that reason I tell the |
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* units and origin of each measurement (where it applies), or else I |
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* use sufficiently weaselly language ("is a monotonically nondecreasing |
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* function of...") that I cannot set false expectations for lawyerly |
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* readers. |
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*/ |
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/* The radio capture header precedes the 802.11 header.
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* All data in the header is little endian on all platforms. |
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*/ |
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struct ieee80211_radiotap_header { |
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uint8_t it_version; /* Version 0. Only increases
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* for drastic changes, |
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* introduction of compatible |
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* new fields does not count. |
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*/ |
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uint8_t it_pad; |
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uint16_t it_len; /* length of the whole
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* header in bytes, including |
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* it_version, it_pad, |
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* it_len, and data fields. |
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*/ |
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uint32_t it_present; /* A bitmap telling which
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* fields are present. Set bit 31 |
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* (0x80000000) to extend the |
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* bitmap by another 32 bits. |
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* Additional extensions are made |
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* by setting bit 31. |
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*/ |
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}; |
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/* Name Data type Units
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* ---- --------- ----- |
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* |
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* IEEE80211_RADIOTAP_TSFT __le64 microseconds |
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* |
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* Value in microseconds of the MAC's 64-bit 802.11 Time |
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* Synchronization Function timer when the first bit of the |
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* MPDU arrived at the MAC. For received frames, only. |
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* |
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* IEEE80211_RADIOTAP_CHANNEL 2 x uint16_t MHz, bitmap |
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* |
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* Tx/Rx frequency in MHz, followed by flags (see below). |
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* |
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* IEEE80211_RADIOTAP_FHSS uint16_t see below |
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* |
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* For frequency-hopping radios, the hop set (first byte) |
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* and pattern (second byte). |
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* |
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* IEEE80211_RADIOTAP_RATE u8 500kb/s |
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* |
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* Tx/Rx data rate |
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* |
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* IEEE80211_RADIOTAP_DBM_ANTSIGNAL s8 decibels from |
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* one milliwatt (dBm) |
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* |
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* RF signal power at the antenna, decibel difference from |
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* one milliwatt. |
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* |
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* IEEE80211_RADIOTAP_DBM_ANTNOISE s8 decibels from |
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* one milliwatt (dBm) |
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* |
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* RF noise power at the antenna, decibel difference from one |
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* milliwatt. |
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* |
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* IEEE80211_RADIOTAP_DB_ANTSIGNAL u8 decibel (dB) |
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* |
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* RF signal power at the antenna, decibel difference from an |
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* arbitrary, fixed reference. |
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* |
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* IEEE80211_RADIOTAP_DB_ANTNOISE u8 decibel (dB) |
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* |
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* RF noise power at the antenna, decibel difference from an |
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* arbitrary, fixed reference point. |
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* |
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* IEEE80211_RADIOTAP_LOCK_QUALITY uint16_t unitless |
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* |
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* Quality of Barker code lock. Unitless. Monotonically |
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* nondecreasing with "better" lock strength. Called "Signal |
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* Quality" in datasheets. (Is there a standard way to measure |
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* this?) |
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* |
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* IEEE80211_RADIOTAP_TX_ATTENUATION uint16_t unitless |
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* |
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* Transmit power expressed as unitless distance from max |
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* power set at factory calibration. 0 is max power. |
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* Monotonically nondecreasing with lower power levels. |
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* |
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* IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t decibels (dB) |
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* |
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* Transmit power expressed as decibel distance from max power |
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* set at factory calibration. 0 is max power. Monotonically |
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* nondecreasing with lower power levels. |
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* |
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* IEEE80211_RADIOTAP_DBM_TX_POWER s8 decibels from |
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* one milliwatt (dBm) |
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* |
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* Transmit power expressed as dBm (decibels from a 1 milliwatt |
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* reference). This is the absolute power level measured at |
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* the antenna port. |
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* |
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* IEEE80211_RADIOTAP_FLAGS u8 bitmap |
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* |
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* Properties of transmitted and received frames. See flags |
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* defined below. |
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* |
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* IEEE80211_RADIOTAP_ANTENNA u8 antenna index |
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* |
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* Unitless indication of the Rx/Tx antenna for this packet. |
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* The first antenna is antenna 0. |
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* |
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* IEEE80211_RADIOTAP_RX_FLAGS uint16_t bitmap |
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* |
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* Properties of received frames. See flags defined below. |
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* |
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* IEEE80211_RADIOTAP_TX_FLAGS uint16_t bitmap |
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* |
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* Properties of transmitted frames. See flags defined below. |
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* |
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* IEEE80211_RADIOTAP_RTS_RETRIES u8 data |
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* |
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* Number of rts retries a transmitted frame used. |
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* |
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* IEEE80211_RADIOTAP_DATA_RETRIES u8 data |
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* |
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* Number of unicast retries a transmitted frame used. |
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* |
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*/ |
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enum ieee80211_radiotap_type { |
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IEEE80211_RADIOTAP_TSFT = 0, |
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IEEE80211_RADIOTAP_FLAGS = 1, |
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IEEE80211_RADIOTAP_RATE = 2, |
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IEEE80211_RADIOTAP_CHANNEL = 3, |
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IEEE80211_RADIOTAP_FHSS = 4, |
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IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5, |
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IEEE80211_RADIOTAP_DBM_ANTNOISE = 6, |
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IEEE80211_RADIOTAP_LOCK_QUALITY = 7, |
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IEEE80211_RADIOTAP_TX_ATTENUATION = 8, |
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IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, |
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IEEE80211_RADIOTAP_DBM_TX_POWER = 10, |
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IEEE80211_RADIOTAP_ANTENNA = 11, |
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IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12, |
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IEEE80211_RADIOTAP_DB_ANTNOISE = 13, |
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IEEE80211_RADIOTAP_RX_FLAGS = 14, |
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IEEE80211_RADIOTAP_TX_FLAGS = 15, |
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IEEE80211_RADIOTAP_RTS_RETRIES = 16, |
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IEEE80211_RADIOTAP_DATA_RETRIES = 17, |
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IEEE80211_RADIOTAP_EXT = 31 |
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}; |
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|
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/* Channel flags. */ |
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#define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */ |
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#define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */ |
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#define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */ |
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#define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */ |
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#define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */ |
||||
#define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */ |
||||
#define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */ |
||||
#define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */ |
||||
|
||||
/* For IEEE80211_RADIOTAP_FLAGS */ |
||||
#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received |
||||
* during CFP |
||||
*/ |
||||
#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received |
||||
* with short |
||||
* preamble |
||||
*/ |
||||
#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received |
||||
* with WEP encryption |
||||
*/ |
||||
#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received |
||||
* with fragmentation |
||||
*/ |
||||
#define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */ |
||||
#define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between |
||||
* 802.11 header and payload |
||||
* (to 32-bit boundary) |
||||
*/ |
||||
/* For IEEE80211_RADIOTAP_RX_FLAGS */ |
||||
#define IEEE80211_RADIOTAP_F_RX_BADFCS 0x0001 /* frame failed crc check */ |
||||
|
||||
/* For IEEE80211_RADIOTAP_TX_FLAGS */ |
||||
#define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive |
||||
* retries */ |
||||
#define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */ |
||||
#define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */ |
||||
|
||||
#endif /* IEEE80211_RADIOTAP_H */ |
||||
@ -0,0 +1,41 @@ |
||||
#ifndef __RADIOTAP_ITER_H |
||||
#define __RADIOTAP_ITER_H |
||||
|
||||
#include "radiotap.h" |
||||
|
||||
/* Radiotap header iteration
|
||||
* implemented in radiotap.c |
||||
*/ |
||||
/**
|
||||
* 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; |
||||
unsigned char *this_arg; |
||||
|
||||
int arg_index; |
||||
unsigned char *arg; |
||||
uint32_t *next_bitmap; |
||||
uint32_t bitmap_shifter; |
||||
}; |
||||
|
||||
extern int ieee80211_radiotap_iterator_init( |
||||
struct ieee80211_radiotap_iterator *iterator, |
||||
struct ieee80211_radiotap_header *radiotap_header, |
||||
int max_length); |
||||
|
||||
extern int ieee80211_radiotap_iterator_next( |
||||
struct ieee80211_radiotap_iterator *iterator); |
||||
|
||||
#endif /* __RADIOTAP_ITER_H */ |
||||
@ -0,0 +1,17 @@ |
||||
Index: hostapd-20071107_03ec0ec5cdb974d51a4a2a566bea4c4568138576/hostapd/Makefile
|
||||
===================================================================
|
||||
--- hostapd-20071107_03ec0ec5cdb974d51a4a2a566bea4c4568138576.orig/hostapd/Makefile 2007-11-16 05:08:24.000000000 +0100
|
||||
+++ hostapd-20071107_03ec0ec5cdb974d51a4a2a566bea4c4568138576/hostapd/Makefile 2008-02-16 19:38:51.000000000 +0100
|
||||
@@ -121,6 +121,12 @@ OBJS += driver_devicescape.o
|
||||
LIBS += -lnl
|
||||
endif
|
||||
|
||||
+ifdef CONFIG_DRIVER_NL80211
|
||||
+CFLAGS += -DCONFIG_DRIVER_NL80211
|
||||
+OBJS += driver_nl80211.o radiotap.o
|
||||
+LIBS += -lnl
|
||||
+endif
|
||||
+
|
||||
ifdef CONFIG_DRIVER_BSD
|
||||
CFLAGS += -DCONFIG_DRIVER_BSD
|
||||
OBJS += driver_bsd.o
|
||||
Loading…
Reference in new issue