Share the same radiotap helper implementation
This commit is contained in:
Jouni Malinen
Jouni Malinen
parent
d200828b41
commit
76e2592190
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@ -136,7 +136,8 @@ endif
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ifdef CONFIG_DRIVER_NL80211
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NEED_MLME=y
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CFLAGS += -DCONFIG_DRIVER_NL80211
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OBJS += driver_nl80211.o radiotap.o
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OBJS += driver_nl80211.o
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OBJS += ../src/utils/radiotap.o
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LIBS += -lnl
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ifdef CONFIG_LIBNL20
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LIBS += -lnl-genl
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@ -1,287 +0,0 @@
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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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@ -1,242 +0,0 @@
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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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*
|
||||
* IEEE80211_RADIOTAP_FLAGS u8 bitmap
|
||||
*
|
||||
* Properties of transmitted and received frames. See flags
|
||||
* defined below.
|
||||
*
|
||||
* IEEE80211_RADIOTAP_ANTENNA u8 antenna index
|
||||
*
|
||||
* Unitless indication of the Rx/Tx antenna for this packet.
|
||||
* The first antenna is antenna 0.
|
||||
*
|
||||
* IEEE80211_RADIOTAP_RX_FLAGS uint16_t bitmap
|
||||
*
|
||||
* Properties of received frames. See flags defined below.
|
||||
*
|
||||
* IEEE80211_RADIOTAP_TX_FLAGS uint16_t bitmap
|
||||
*
|
||||
* Properties of transmitted frames. See flags defined below.
|
||||
*
|
||||
* IEEE80211_RADIOTAP_RTS_RETRIES u8 data
|
||||
*
|
||||
* Number of rts retries a transmitted frame used.
|
||||
*
|
||||
* IEEE80211_RADIOTAP_DATA_RETRIES u8 data
|
||||
*
|
||||
* Number of unicast retries a transmitted frame used.
|
||||
*
|
||||
*/
|
||||
enum ieee80211_radiotap_type {
|
||||
IEEE80211_RADIOTAP_TSFT = 0,
|
||||
IEEE80211_RADIOTAP_FLAGS = 1,
|
||||
IEEE80211_RADIOTAP_RATE = 2,
|
||||
IEEE80211_RADIOTAP_CHANNEL = 3,
|
||||
IEEE80211_RADIOTAP_FHSS = 4,
|
||||
IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
|
||||
IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
|
||||
IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
|
||||
IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
|
||||
IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
|
||||
IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
|
||||
IEEE80211_RADIOTAP_ANTENNA = 11,
|
||||
IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
|
||||
IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
|
||||
IEEE80211_RADIOTAP_RX_FLAGS = 14,
|
||||
IEEE80211_RADIOTAP_TX_FLAGS = 15,
|
||||
IEEE80211_RADIOTAP_RTS_RETRIES = 16,
|
||||
IEEE80211_RADIOTAP_DATA_RETRIES = 17,
|
||||
IEEE80211_RADIOTAP_EXT = 31
|
||||
};
|
||||
|
||||
/* Channel flags. */
|
||||
#define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
|
||||
#define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
|
||||
#define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
|
||||
#define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
|
||||
#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 */
|
||||
|
|
@ -1,41 +0,0 @@
|
|||
#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 */
|
||||
|
|
@ -132,7 +132,7 @@ CFLAGS += -DCONFIG_DRIVER_NL80211
|
|||
OBJS_d += ../src/drivers/driver_nl80211.o
|
||||
LIBS += -lnl
|
||||
ifdef CONFIG_CLIENT_MLME
|
||||
OBJS_d += ../src/drivers/radiotap.o
|
||||
OBJS_d += ../src/utils/radiotap.o
|
||||
endif
|
||||
endif
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue