include/net/ieee80211_radiotap.h - kernel/common - Git at Google


            
            /*

            
             * 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 ([email protected])

            
             */


            #ifndef IEEE80211RADIOTAP_H

            
            #define IEEE80211RADIOTAP_H


            #include <linux/if_ether.h>

            
            #include <linux/kernel.h>

            
            #include <asm/unaligned.h>


            /* 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.

            
             */


            /*

            
             * 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.

            
            				 */

            
            } __packed;


            /* 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.

            
             *

            
             * IEEE80211_RADIOTAP_MCS	u8, u8, u8		unitless

            
             *

            
             *     Contains a bitmap of known fields/flags, the flags, and

            
             *     the MCS index.

            
             *

            
             * IEEE80211_RADIOTAP_AMPDU_STATUS	u32, u16, u8, u8	unitless

            
             *

            
             *	Contains the AMPDU information for the subframe.

            
             *

            
             * IEEE80211_RADIOTAP_VHT	u16, u8, u8, u8[4], u8, u8, u16

            
             *

            
             *	Contains VHT information about this frame.

            
             */

            
            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_MCS = 19,

            
            	IEEE80211_RADIOTAP_AMPDU_STATUS = 20,

            
            	IEEE80211_RADIOTAP_VHT = 21,


            	/* valid in every it_present bitmap, even vendor namespaces */

            
            	IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,

            
            	IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30,

            
            	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) */

            
            #define	IEEE80211_CHAN_GSM	0x1000	/* GSM (900 MHz) */

            
            #define	IEEE80211_CHAN_STURBO	0x2000	/* Static Turbo */

            
            #define	IEEE80211_CHAN_HALF	0x4000	/* Half channel (10 MHz wide) */

            
            #define	IEEE80211_CHAN_QUARTER	0x8000	/* Quarter channel (5 MHz wide) */


            /* 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)

            
            						 */

            
            #define IEEE80211_RADIOTAP_F_BADFCS	0x40	/* bad FCS */


            /* For IEEE80211_RADIOTAP_RX_FLAGS */

            
            #define IEEE80211_RADIOTAP_F_RX_BADPLCP	0x0002	/* frame has bad PLCP */


            /* 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 */

            
            #define IEEE80211_RADIOTAP_F_TX_NOACK	0x0008	/* don't expect an ack */


            /* For IEEE80211_RADIOTAP_MCS */

            
            #define IEEE80211_RADIOTAP_MCS_HAVE_BW		0x01

            
            #define IEEE80211_RADIOTAP_MCS_HAVE_MCS		0x02

            
            #define IEEE80211_RADIOTAP_MCS_HAVE_GI		0x04

            
            #define IEEE80211_RADIOTAP_MCS_HAVE_FMT		0x08

            
            #define IEEE80211_RADIOTAP_MCS_HAVE_FEC		0x10

            
            #define IEEE80211_RADIOTAP_MCS_HAVE_STBC	0x20


            #define IEEE80211_RADIOTAP_MCS_BW_MASK		0x03

            
            #define		IEEE80211_RADIOTAP_MCS_BW_20	0

            
            #define		IEEE80211_RADIOTAP_MCS_BW_40	1

            
            #define		IEEE80211_RADIOTAP_MCS_BW_20L	2

            
            #define		IEEE80211_RADIOTAP_MCS_BW_20U	3

            
            #define IEEE80211_RADIOTAP_MCS_SGI		0x04

            
            #define IEEE80211_RADIOTAP_MCS_FMT_GF		0x08

            
            #define IEEE80211_RADIOTAP_MCS_FEC_LDPC		0x10

            
            #define IEEE80211_RADIOTAP_MCS_STBC_MASK	0x60

            
            #define		IEEE80211_RADIOTAP_MCS_STBC_1	1

            
            #define		IEEE80211_RADIOTAP_MCS_STBC_2	2

            
            #define		IEEE80211_RADIOTAP_MCS_STBC_3	3


            #define IEEE80211_RADIOTAP_MCS_STBC_SHIFT	5


            /* For IEEE80211_RADIOTAP_AMPDU_STATUS */

            
            #define IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN		0x0001

            
            #define IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN		0x0002

            
            #define IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN		0x0004

            
            #define IEEE80211_RADIOTAP_AMPDU_IS_LAST		0x0008

            
            #define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR		0x0010

            
            #define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN	0x0020


            /* For IEEE80211_RADIOTAP_VHT */

            
            #define IEEE80211_RADIOTAP_VHT_KNOWN_STBC			0x0001

            
            #define IEEE80211_RADIOTAP_VHT_KNOWN_TXOP_PS_NA			0x0002

            
            #define IEEE80211_RADIOTAP_VHT_KNOWN_GI				0x0004

            
            #define IEEE80211_RADIOTAP_VHT_KNOWN_SGI_NSYM_DIS		0x0008

            
            #define IEEE80211_RADIOTAP_VHT_KNOWN_LDPC_EXTRA_OFDM_SYM	0x0010

            
            #define IEEE80211_RADIOTAP_VHT_KNOWN_BEAMFORMED			0x0020

            
            #define IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH			0x0040

            
            #define IEEE80211_RADIOTAP_VHT_KNOWN_GROUP_ID			0x0080

            
            #define IEEE80211_RADIOTAP_VHT_KNOWN_PARTIAL_AID		0x0100


            #define IEEE80211_RADIOTAP_VHT_FLAG_STBC			0x01

            
            #define IEEE80211_RADIOTAP_VHT_FLAG_TXOP_PS_NA			0x02

            
            #define IEEE80211_RADIOTAP_VHT_FLAG_SGI				0x04

            
            #define IEEE80211_RADIOTAP_VHT_FLAG_SGI_NSYM_M10_9		0x08

            
            #define IEEE80211_RADIOTAP_VHT_FLAG_LDPC_EXTRA_OFDM_SYM		0x10

            
            #define IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED			0x20


            #define IEEE80211_RADIOTAP_CODING_LDPC_USER0			0x01

            
            #define IEEE80211_RADIOTAP_CODING_LDPC_USER1			0x02

            
            #define IEEE80211_RADIOTAP_CODING_LDPC_USER2			0x04

            
            #define IEEE80211_RADIOTAP_CODING_LDPC_USER3			0x08


            /* helpers */

            
            static inline int ieee80211_get_radiotap_len(unsigned char *data)

            
            {

            
            	struct ieee80211_radiotap_header *hdr =

            
            		(struct ieee80211_radiotap_header *)data;


            	return get_unaligned_le16(&hdr->it_len);

            
            }


            #endif				/* IEEE80211_RADIOTAP_H */
	/*
	* 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 ([email protected])
	*/

	#ifndef IEEE80211RADIOTAP_H
	#define IEEE80211RADIOTAP_H

	#include <linux/if_ether.h>
	#include <linux/kernel.h>
	#include <asm/unaligned.h>

	/* 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.
	*/

	/*
	* 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.
	*/
	} __packed;

	/* 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.
	*
	* IEEE80211_RADIOTAP_MCS u8, u8, u8 unitless
	*
	* Contains a bitmap of known fields/flags, the flags, and
	* the MCS index.
	*
	* IEEE80211_RADIOTAP_AMPDU_STATUS u32, u16, u8, u8 unitless
	*
	* Contains the AMPDU information for the subframe.
	*
	* IEEE80211_RADIOTAP_VHT u16, u8, u8, u8[4], u8, u8, u16
	*
	* Contains VHT information about this frame.
	*/
	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_MCS = 19,
	IEEE80211_RADIOTAP_AMPDU_STATUS = 20,
	IEEE80211_RADIOTAP_VHT = 21,

	/* valid in every it_present bitmap, even vendor namespaces */
	IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
	IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30,
	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) */
	#define IEEE80211_CHAN_GSM 0x1000 /* GSM (900 MHz) */
	#define IEEE80211_CHAN_STURBO 0x2000 /* Static Turbo */
	#define IEEE80211_CHAN_HALF 0x4000 /* Half channel (10 MHz wide) */
	#define IEEE80211_CHAN_QUARTER 0x8000 /* Quarter channel (5 MHz wide) */

	/* 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)
	*/
	#define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* bad FCS */

	/* For IEEE80211_RADIOTAP_RX_FLAGS */
	#define IEEE80211_RADIOTAP_F_RX_BADPLCP 0x0002 /* frame has bad PLCP */

	/* 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 */
	#define IEEE80211_RADIOTAP_F_TX_NOACK 0x0008 /* don't expect an ack */


	/* For IEEE80211_RADIOTAP_MCS */
	#define IEEE80211_RADIOTAP_MCS_HAVE_BW 0x01
	#define IEEE80211_RADIOTAP_MCS_HAVE_MCS 0x02
	#define IEEE80211_RADIOTAP_MCS_HAVE_GI 0x04
	#define IEEE80211_RADIOTAP_MCS_HAVE_FMT 0x08
	#define IEEE80211_RADIOTAP_MCS_HAVE_FEC 0x10
	#define IEEE80211_RADIOTAP_MCS_HAVE_STBC 0x20

	#define IEEE80211_RADIOTAP_MCS_BW_MASK 0x03
	#define IEEE80211_RADIOTAP_MCS_BW_20 0
	#define IEEE80211_RADIOTAP_MCS_BW_40 1
	#define IEEE80211_RADIOTAP_MCS_BW_20L 2
	#define IEEE80211_RADIOTAP_MCS_BW_20U 3
	#define IEEE80211_RADIOTAP_MCS_SGI 0x04
	#define IEEE80211_RADIOTAP_MCS_FMT_GF 0x08
	#define IEEE80211_RADIOTAP_MCS_FEC_LDPC 0x10
	#define IEEE80211_RADIOTAP_MCS_STBC_MASK 0x60
	#define IEEE80211_RADIOTAP_MCS_STBC_1 1
	#define IEEE80211_RADIOTAP_MCS_STBC_2 2
	#define IEEE80211_RADIOTAP_MCS_STBC_3 3

	#define IEEE80211_RADIOTAP_MCS_STBC_SHIFT 5

	/* For IEEE80211_RADIOTAP_AMPDU_STATUS */
	#define IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN 0x0001
	#define IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN 0x0002
	#define IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN 0x0004
	#define IEEE80211_RADIOTAP_AMPDU_IS_LAST 0x0008
	#define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR 0x0010
	#define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN 0x0020

	/* For IEEE80211_RADIOTAP_VHT */
	#define IEEE80211_RADIOTAP_VHT_KNOWN_STBC 0x0001
	#define IEEE80211_RADIOTAP_VHT_KNOWN_TXOP_PS_NA 0x0002
	#define IEEE80211_RADIOTAP_VHT_KNOWN_GI 0x0004
	#define IEEE80211_RADIOTAP_VHT_KNOWN_SGI_NSYM_DIS 0x0008
	#define IEEE80211_RADIOTAP_VHT_KNOWN_LDPC_EXTRA_OFDM_SYM 0x0010
	#define IEEE80211_RADIOTAP_VHT_KNOWN_BEAMFORMED 0x0020
	#define IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH 0x0040
	#define IEEE80211_RADIOTAP_VHT_KNOWN_GROUP_ID 0x0080
	#define IEEE80211_RADIOTAP_VHT_KNOWN_PARTIAL_AID 0x0100

	#define IEEE80211_RADIOTAP_VHT_FLAG_STBC 0x01
	#define IEEE80211_RADIOTAP_VHT_FLAG_TXOP_PS_NA 0x02
	#define IEEE80211_RADIOTAP_VHT_FLAG_SGI 0x04
	#define IEEE80211_RADIOTAP_VHT_FLAG_SGI_NSYM_M10_9 0x08
	#define IEEE80211_RADIOTAP_VHT_FLAG_LDPC_EXTRA_OFDM_SYM 0x10
	#define IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED 0x20

	#define IEEE80211_RADIOTAP_CODING_LDPC_USER0 0x01
	#define IEEE80211_RADIOTAP_CODING_LDPC_USER1 0x02
	#define IEEE80211_RADIOTAP_CODING_LDPC_USER2 0x04
	#define IEEE80211_RADIOTAP_CODING_LDPC_USER3 0x08

	/* helpers */
	static inline int ieee80211_get_radiotap_len(unsigned char *data)
	{
	struct ieee80211_radiotap_header *hdr =
	(struct ieee80211_radiotap_header *)data;

	return get_unaligned_le16(&hdr->it_len);
	}

	#endif /* IEEE80211_RADIOTAP_H */