mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 09:44:18 +08:00
dfe6e81dea
ieee80211_get_radiotap_len() tries to dereference radiotap length without taking care that it is completely unaligned and get_unaligned() is required. Signed-off-by: Andy Green <andy@warmcat.com> Signed-off-by: Jiri Benc <jbenc@suse.cz> Signed-off-by: John W. Linville <linville@tuxdriver.com>
269 lines
9.8 KiB
C
269 lines
9.8 KiB
C
/* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5 2005/01/22 20:12:05 sam Exp $ */
|
|
/* $NetBSD: ieee80211_radiotap.h,v 1.11 2005/06/22 06:16:02 dyoung Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2003, 2004 David Young. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of David Young may not be used to endorse or promote
|
|
* products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
|
|
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
|
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
|
|
* YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
|
|
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
|
|
* OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Modifications to fit into the linux IEEE 802.11 stack,
|
|
* Mike Kershaw (dragorn@kismetwireless.net)
|
|
*/
|
|
|
|
#ifndef IEEE80211RADIOTAP_H
|
|
#define IEEE80211RADIOTAP_H
|
|
|
|
#include <linux/if_ether.h>
|
|
#include <linux/kernel.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
/* Radiotap header version (from official NetBSD feed) */
|
|
#define IEEE80211RADIOTAP_VERSION "1.5"
|
|
/* Base version of the radiotap packet header data */
|
|
#define PKTHDR_RADIOTAP_VERSION 0
|
|
|
|
/* A generic radio capture format is desirable. There is one for
|
|
* Linux, but it is neither rigidly defined (there were not even
|
|
* units given for some fields) nor easily extensible.
|
|
*
|
|
* I suggest the following extensible radio capture format. It is
|
|
* based on a bitmap indicating which fields are present.
|
|
*
|
|
* I am trying to describe precisely what the application programmer
|
|
* should expect in the following, and for that reason I tell the
|
|
* units and origin of each measurement (where it applies), or else I
|
|
* use sufficiently weaselly language ("is a monotonically nondecreasing
|
|
* function of...") that I cannot set false expectations for lawyerly
|
|
* readers.
|
|
*/
|
|
|
|
/* XXX tcpdump/libpcap do not tolerate variable-length headers,
|
|
* yet, so we pad every radiotap header to 64 bytes. Ugh.
|
|
*/
|
|
#define IEEE80211_RADIOTAP_HDRLEN 64
|
|
|
|
/* The radio capture header precedes the 802.11 header.
|
|
* All data in the header is little endian on all platforms.
|
|
*/
|
|
struct ieee80211_radiotap_header {
|
|
u8 it_version; /* Version 0. Only increases
|
|
* for drastic changes,
|
|
* introduction of compatible
|
|
* new fields does not count.
|
|
*/
|
|
u8 it_pad;
|
|
__le16 it_len; /* length of the whole
|
|
* header in bytes, including
|
|
* it_version, it_pad,
|
|
* it_len, and data fields.
|
|
*/
|
|
__le32 it_present; /* A bitmap telling which
|
|
* fields are present. Set bit 31
|
|
* (0x80000000) to extend the
|
|
* bitmap by another 32 bits.
|
|
* Additional extensions are made
|
|
* by setting bit 31.
|
|
*/
|
|
};
|
|
|
|
/* Name Data type Units
|
|
* ---- --------- -----
|
|
*
|
|
* IEEE80211_RADIOTAP_TSFT __le64 microseconds
|
|
*
|
|
* Value in microseconds of the MAC's 64-bit 802.11 Time
|
|
* Synchronization Function timer when the first bit of the
|
|
* MPDU arrived at the MAC. For received frames, only.
|
|
*
|
|
* IEEE80211_RADIOTAP_CHANNEL 2 x __le16 MHz, bitmap
|
|
*
|
|
* Tx/Rx frequency in MHz, followed by flags (see below).
|
|
*
|
|
* IEEE80211_RADIOTAP_FHSS __le16 see below
|
|
*
|
|
* For frequency-hopping radios, the hop set (first byte)
|
|
* and pattern (second byte).
|
|
*
|
|
* IEEE80211_RADIOTAP_RATE u8 500kb/s
|
|
*
|
|
* Tx/Rx data rate
|
|
*
|
|
* IEEE80211_RADIOTAP_DBM_ANTSIGNAL s8 decibels from
|
|
* one milliwatt (dBm)
|
|
*
|
|
* RF signal power at the antenna, decibel difference from
|
|
* one milliwatt.
|
|
*
|
|
* IEEE80211_RADIOTAP_DBM_ANTNOISE s8 decibels from
|
|
* one milliwatt (dBm)
|
|
*
|
|
* RF noise power at the antenna, decibel difference from one
|
|
* milliwatt.
|
|
*
|
|
* IEEE80211_RADIOTAP_DB_ANTSIGNAL u8 decibel (dB)
|
|
*
|
|
* RF signal power at the antenna, decibel difference from an
|
|
* arbitrary, fixed reference.
|
|
*
|
|
* IEEE80211_RADIOTAP_DB_ANTNOISE u8 decibel (dB)
|
|
*
|
|
* RF noise power at the antenna, decibel difference from an
|
|
* arbitrary, fixed reference point.
|
|
*
|
|
* IEEE80211_RADIOTAP_LOCK_QUALITY __le16 unitless
|
|
*
|
|
* Quality of Barker code lock. Unitless. Monotonically
|
|
* nondecreasing with "better" lock strength. Called "Signal
|
|
* Quality" in datasheets. (Is there a standard way to measure
|
|
* this?)
|
|
*
|
|
* IEEE80211_RADIOTAP_TX_ATTENUATION __le16 unitless
|
|
*
|
|
* Transmit power expressed as unitless distance from max
|
|
* power set at factory calibration. 0 is max power.
|
|
* Monotonically nondecreasing with lower power levels.
|
|
*
|
|
* IEEE80211_RADIOTAP_DB_TX_ATTENUATION __le16 decibels (dB)
|
|
*
|
|
* Transmit power expressed as decibel distance from max power
|
|
* set at factory calibration. 0 is max power. Monotonically
|
|
* nondecreasing with lower power levels.
|
|
*
|
|
* IEEE80211_RADIOTAP_DBM_TX_POWER s8 decibels from
|
|
* one milliwatt (dBm)
|
|
*
|
|
* Transmit power expressed as dBm (decibels from a 1 milliwatt
|
|
* reference). This is the absolute power level measured at
|
|
* the antenna port.
|
|
*
|
|
* 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 __le16 bitmap
|
|
*
|
|
* Properties of received frames. See flags defined below.
|
|
*
|
|
* IEEE80211_RADIOTAP_TX_FLAGS __le16 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 */
|
|
|
|
/* Ugly macro to convert literal channel numbers into their mhz equivalents
|
|
* There are certianly some conditions that will break this (like feeding it '30')
|
|
* but they shouldn't arise since nothing talks on channel 30. */
|
|
#define ieee80211chan2mhz(x) \
|
|
(((x) <= 14) ? \
|
|
(((x) == 14) ? 2484 : ((x) * 5) + 2407) : \
|
|
((x) + 1000) * 5)
|
|
|
|
/* helpers */
|
|
static inline int ieee80211_get_radiotap_len(unsigned char *data)
|
|
{
|
|
struct ieee80211_radiotap_header *hdr =
|
|
(struct ieee80211_radiotap_header *)data;
|
|
|
|
return le16_to_cpu(get_unaligned(&hdr->it_len));
|
|
}
|
|
|
|
#endif /* IEEE80211_RADIOTAP_H */
|