/* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5 2005/01/22 20:12:05 sam Exp $ *//* NetBSD: ieee802_11_radio.h,v 1.2 2006/02/26 03:04:03 dyoung Exp  *//* $Header: /tcpdump/master/tcpdump/ieee802_11_radio.h,v 1.3 2007-08-29 02:31:44 mcr 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. */#ifndef _NET_IF_IEEE80211RADIOTAP_H_#define _NET_IF_IEEE80211RADIOTAP_H_/* 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. */#if defined(__KERNEL__) || defined(_KERNEL)#ifndef DLT_IEEE802_11_RADIO#define	DLT_IEEE802_11_RADIO	127	/* 802.11 plus WLAN header */#endif#endif /* defined(__KERNEL__) || defined(_KERNEL) *//* The radio capture header precedes the 802.11 header. */struct ieee80211_radiotap_header {	u_int8_t	it_version;	/* Version 0. Only increases					 * for drastic changes,					 * introduction of compatible					 * new fields does not count.					 */	u_int8_t	it_pad;	u_int16_t       it_len;         /* length of the whole					 * header in bytes, including					 * it_version, it_pad,					 * it_len, and data fields.					 */	u_int32_t       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.					 */} __attribute__((__packed__));/* Name                                 Data type       Units * ----                                 ---------       ----- * * IEEE80211_RADIOTAP_TSFT              u_int64_t       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 u_int16_t   MHz, bitmap * *      Tx/Rx frequency in MHz, followed by flags (see below). * * IEEE80211_RADIOTAP_FHSS              u_int16_t       see below * *      For frequency-hopping radios, the hop set (first byte) *      and pattern (second byte). * * IEEE80211_RADIOTAP_RATE              u_int8_t        500kb/s * *      Tx/Rx data rate * * IEEE80211_RADIOTAP_DBM_ANTSIGNAL     int8_t          decibels from *                                                      one milliwatt (dBm) * *      RF signal power at the antenna, decibel difference from *      one milliwatt. * * IEEE80211_RADIOTAP_DBM_ANTNOISE      int8_t          decibels from *                                                      one milliwatt (dBm) * *      RF noise power at the antenna, decibel difference from one *      milliwatt. * * IEEE80211_RADIOTAP_DB_ANTSIGNAL      u_int8_t        decibel (dB) * *      RF signal power at the antenna, decibel difference from an *      arbitrary, fixed reference. * * IEEE80211_RADIOTAP_DB_ANTNOISE       u_int8_t        decibel (dB) * *      RF noise power at the antenna, decibel difference from an *      arbitrary, fixed reference point. * * IEEE80211_RADIOTAP_LOCK_QUALITY      u_int16_t       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    u_int16_t       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 u_int16_t       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      int8_t          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             u_int8_t        bitmap * *      Properties of transmitted and received frames. See flags *      defined below. * * IEEE80211_RADIOTAP_ANTENNA           u_int8_t        antenna index * *      Unitless indication of the Rx/Tx antenna for this packet. *      The first antenna is antenna 0. * * IEEE80211_RADIOTAP_FCS           	u_int32_t       data * *	FCS from frame in network byte order. */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_EXT = 31};#ifndef _KERNEL/* 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) */#endif /* !_KERNEL *//* 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	/* does not pass FCS check */#endif /* _NET_IF_IEEE80211RADIOTAP_H_ */