ieee80211_radiotap.h revision 119782
1119782Ssam/* $FreeBSD: head/sys/net80211/ieee80211_radiotap.h 119782 2003-09-05 22:19:32Z sam $ */ 2119782Ssam/* $NetBSD: $ */ 3119782Ssam 4119782Ssam/*- 5119782Ssam * Copyright (c) 2003, 2004 David Young. All rights reserved. 6119782Ssam * 7119782Ssam * Redistribution and use in source and binary forms, with or without 8119782Ssam * modification, are permitted provided that the following conditions 9119782Ssam * are met: 10119782Ssam * 1. Redistributions of source code must retain the above copyright 11119782Ssam * notice, this list of conditions and the following disclaimer. 12119782Ssam * 2. Redistributions in binary form must reproduce the above copyright 13119782Ssam * notice, this list of conditions and the following disclaimer in the 14119782Ssam * documentation and/or other materials provided with the distribution. 15119782Ssam * 3. The name of David Young may not be used to endorse or promote 16119782Ssam * products derived from this software without specific prior 17119782Ssam * written permission. 18119782Ssam * 19119782Ssam * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY 20119782Ssam * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21119782Ssam * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 22119782Ssam * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID 23119782Ssam * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24119782Ssam * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 25119782Ssam * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26119782Ssam * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 27119782Ssam * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28119782Ssam * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29119782Ssam * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 30119782Ssam * OF SUCH DAMAGE. 31119782Ssam */ 32119782Ssam#ifndef _NET_IF_IEEE80211RADIOTAP_H_ 33119782Ssam#define _NET_IF_IEEE80211RADIOTAP_H_ 34119782Ssam 35119782Ssam/* A generic radio capture format is desirable. There is one for 36119782Ssam * Linux, but it is neither rigidly defined (there were not even 37119782Ssam * units given for some fields) nor easily extensible. 38119782Ssam * 39119782Ssam * I suggest the following extensible radio capture format. It is 40119782Ssam * based on a bitmap indicating which fields are present. 41119782Ssam * 42119782Ssam * I am trying to describe precisely what the application programmer 43119782Ssam * should expect in the following, and for that reason I tell the 44119782Ssam * units and origin of each measurement (where it applies), or else I 45119782Ssam * use sufficiently weaselly language ("is a monotonically nondecreasing 46119782Ssam * function of...") that I cannot set false expectations for lawyerly 47119782Ssam * readers. 48119782Ssam */ 49119782Ssam#ifndef DLT_IEEE802_11_RADIO 50119782Ssam#define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */ 51119782Ssam#endif 52119782Ssam 53119782Ssam/* The radio capture header precedes the 802.11 header. */ 54119782Ssamstruct ieee80211_radiotap_header { 55119782Ssam u_int8_t it_version; /* Version 0. Only increases 56119782Ssam * for drastic changes, 57119782Ssam * introduction of compatible 58119782Ssam * new LTVs does not count. 59119782Ssam */ 60119782Ssam u_int8_t it_pad; 61119782Ssam u_int16_t it_len; /* length of the whole 62119782Ssam * header in bytes, including 63119782Ssam * it_version, it_pad, 64119782Ssam * it_len, and LTVs. 65119782Ssam */ 66119782Ssam u_int32_t it_present; /* A bitmap telling which 67119782Ssam * fields are present. Set bit 31 68119782Ssam * (0x80000000) to extend the 69119782Ssam * bitmap by another 32 bits. 70119782Ssam * Additional extensions are made 71119782Ssam * by setting bit 31. 72119782Ssam */ 73119782Ssam}; 74119782Ssam 75119782Ssam/* Name Data type Units 76119782Ssam * ---- --------- ----- 77119782Ssam * 78119782Ssam * IEEE80211_RADIOTAP_CHANNEL u_int8_t MHz 79119782Ssam * 80119782Ssam * Tx/Rx channel number (for DSSS/OFDM/PBCC PHY) 81119782Ssam * 82119782Ssam * IEEE80211_RADIOTAP_FHSS u_int16_t see below 83119782Ssam * 84119782Ssam * For frequency-hopping radios, the hop set (first byte) 85119782Ssam * and pattern (second byte). 86119782Ssam * 87119782Ssam * IEEE80211_RADIOTAP_RATE u_int8_t .5Mb/s 88119782Ssam * 89119782Ssam * IEEE Tx/Rx data rate cookie (including basic rate flag) 90119782Ssam * 91119782Ssam * IEEE80211_RADIOTAP_DB_ANTSIGNAL int16_t decibel (dB) 92119782Ssam * 93119782Ssam * RF signal power at the antenna, measured from a fixed, 94119782Ssam * arbitrary reference point. 95119782Ssam * 96119782Ssam * IEEE80211_RADIOTAP_DB_ANTNOISE int16_t decibel (dB) 97119782Ssam * 98119782Ssam * RF noise power at the antenna in decibels from an arbitrary, 99119782Ssam * fixed reference point. 100119782Ssam * 101119782Ssam * IEEE80211_RADIOTAP_BARKER_CODE_LOCK u_int16_t unitless 102119782Ssam * 103119782Ssam * Quality of Barker code lock. Unitless. Monotonically 104119782Ssam * nondecreasing with "better" lock strength. Called "Signal 105119782Ssam * Quality" in datasheets. (Is there a standard way to measure 106119782Ssam * this?) 107119782Ssam * 108119782Ssam * IEEE80211_RADIOTAP_TX_ATTENUATION u_int16_t unitless 109119782Ssam * 110119782Ssam * Transmit power expressed as unitless distance from max 111119782Ssam * power set at factory calibration. 0 is max power. 112119782Ssam * Monotonically nondecreasing with lower power levels. 113119782Ssam * 114119782Ssam * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t decibels (dB) 115119782Ssam * 116119782Ssam * Transmit power expressed as decibel distance from max power 117119782Ssam * set at factory calibration. 0 is max power. Monotonically 118119782Ssam * nondecreasing with lower power levels. 119119782Ssam * 120119782Ssam * IEEE80211_RADIOTAP_DBM_TX_POWER u_int16_t decibels from 121119782Ssam * milliwatt (dBm) 122119782Ssam * 123119782Ssam * Transmit power expressed as dBm (decibels from a 1 milliwatt 124119782Ssam * reference). This is the absolute power level measured at 125119782Ssam * the antenna port. 126119782Ssam * 127119782Ssam * IEEE80211_RADIOTAP_TSFT u_int64_t microseconds 128119782Ssam * 129119782Ssam * Value in microseconds of the MAC's 64-bit 802.11 Time 130119782Ssam * Synchronization Function timer when the first bit of the 131119782Ssam * MPDU arrived at the MAC. For received frames, only. 132119782Ssam * Little-endian byte order. 133119782Ssam * 134119782Ssam * IEEE80211_RADIOTAP_FLAGS u_int16_t bitmap 135119782Ssam * 136119782Ssam * Properties of transmitted and received frames. See flags 137119782Ssam * defined below. 138119782Ssam * 139119782Ssam * IEEE80211_RADIOTAP_TIME u_int32_t microseconds 140119782Ssam * 141119782Ssam * For radios that provide it: packet arrival time in 142119782Ssam * microseconds. Prism hardware will provide this, but it is 143119782Ssam * not known whether it marks the first or the last bit of 144119782Ssam * the frame. Nor is it known where that bit has arrived 145119782Ssam * (antenna, modem, MAC?) when the time is measured. 146119782Ssam * 147119782Ssam * IEEE80211_RADIOTAP_ANTENNA u_int16_t antenna index 148119782Ssam * 149119782Ssam * Unitless indication of the Rx/Tx antenna for this packet. 150119782Ssam * The first antenna is antenna 0. 151119782Ssam */ 152119782Ssamenum ieee80211_radiotap_type { 153119782Ssam IEEE80211_RADIOTAP_PAD = 0, 154119782Ssam IEEE80211_RADIOTAP_FLAGS = 1, 155119782Ssam IEEE80211_RADIOTAP_RATE = 2, 156119782Ssam IEEE80211_RADIOTAP_CHANNEL = 3, 157119782Ssam IEEE80211_RADIOTAP_FHSS = 4, 158119782Ssam IEEE80211_RADIOTAP_DB_ANTSIGNAL = 5, 159119782Ssam IEEE80211_RADIOTAP_DB_ANTNOISE = 6, 160119782Ssam IEEE80211_RADIOTAP_LOCK_QUALITY = 7, 161119782Ssam IEEE80211_RADIOTAP_TX_ATTENUATION = 8, 162119782Ssam IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, 163119782Ssam IEEE80211_RADIOTAP_DBM_TX_POWER = 10, 164119782Ssam IEEE80211_RADIOTAP_ANTENNA = 11, 165119782Ssam IEEE80211_RADIOTAP_TSFT = 12, 166119782Ssam IEEE80211_RADIOTAP_EXT = 31, 167119782Ssam IEEE80211_RADIOTAP_TIME = 32 168119782Ssam}; 169119782Ssam 170119782Ssam/* For IEEE80211_RADIOTAP_FLAGS */ 171119782Ssam#define IEEE80211_RADIOTAP_F_CFP 0x0001 /* sent/received 172119782Ssam * during CFP 173119782Ssam */ 174119782Ssam#define IEEE80211_RADIOTAP_F_SHORTPRE 0x0002 /* sent/received 175119782Ssam * with short 176119782Ssam * preamble 177119782Ssam */ 178119782Ssam#define IEEE80211_RADIOTAP_F_WEP 0x0004 /* sent/received 179119782Ssam * with WEP encryption 180119782Ssam */ 181119782Ssam#define IEEE80211_RADIOTAP_F_FRAG 0x0008 /* sent/received 182119782Ssam * with fragmentation 183119782Ssam */ 184119782Ssam 185119782Ssam#endif /* _NET_IF_IEEE80211RADIOTAP_H_ */ 186