1 /* $OpenBSD: ieee80211_radiotap.h,v 1.11 2010/07/17 16:25:09 damien Exp $ */ 2 /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.3 2004/04/05 22:13:21 sam Exp $ */ 3 /* $NetBSD: ieee80211_radiotap.h,v 1.9 2004/06/06 04:13:28 dyoung Exp $ */ 4 5 /*- 6 * Copyright (c) 2003, 2004 David Young. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 19 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 20 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID 21 * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 23 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 28 * OF SUCH DAMAGE. 29 */ 30 #ifndef _NET_IF_IEEE80211RADIOTAP_H_ 31 #define _NET_IF_IEEE80211RADIOTAP_H_ 32 33 /* A generic radio capture format is desirable. There is one for 34 * Linux, but it is neither rigidly defined (there were not even 35 * units given for some fields) nor easily extensible. 36 * 37 * I suggest the following extensible radio capture format. It is 38 * based on a bitmap indicating which fields are present. 39 * 40 * I am trying to describe precisely what the application programmer 41 * should expect in the following, and for that reason I tell the 42 * units and origin of each measurement (where it applies), or else I 43 * use sufficiently weaselly language ("is a monotonically nondecreasing 44 * function of...") that I cannot set false expectations for lawyerly 45 * readers. 46 */ 47 48 /* XXX tcpdump/libpcap do not tolerate variable-length headers, 49 * yet, so we pad every radiotap header to 64 bytes. Ugh. 50 */ 51 #define IEEE80211_RADIOTAP_HDRLEN 64 52 53 /* The radio capture header precedes the 802.11 header. */ 54 struct ieee80211_radiotap_header { 55 u_int8_t it_version; /* Version 0. Only increases 56 * for drastic changes, 57 * introduction of compatible 58 * new fields does not count. 59 */ 60 u_int8_t it_pad; 61 u_int16_t it_len; /* length of the whole 62 * header in bytes, including 63 * it_version, it_pad, 64 * it_len, and data fields. 65 */ 66 u_int32_t it_present; /* A bitmap telling which 67 * fields are present. Set bit 31 68 * (0x80000000) to extend the 69 * bitmap by another 32 bits. 70 * Additional extensions are made 71 * by setting bit 31. 72 */ 73 } __packed; 74 75 /* Name Data type Units 76 * ---- --------- ----- 77 * 78 * IEEE80211_RADIOTAP_TSFT u_int64_t microseconds 79 * 80 * Value in microseconds of the MAC's 64-bit 802.11 Time 81 * Synchronization Function timer when the first bit of the 82 * MPDU arrived at the MAC. For received frames, only. 83 * 84 * IEEE80211_RADIOTAP_CHANNEL 2 x u_int16_t MHz, bitmap 85 * 86 * Tx/Rx frequency in MHz, followed by flags (see below). 87 * 88 * IEEE80211_RADIOTAP_FHSS u_int16_t see below 89 * 90 * For frequency-hopping radios, the hop set (first byte) 91 * and pattern (second byte). 92 * 93 * IEEE80211_RADIOTAP_RATE u_int8_t 500kb/s 94 * 95 * Tx/Rx data rate 96 * 97 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from 98 * one milliwatt (dBm) 99 * 100 * RF signal power at the antenna, decibel difference from 101 * one milliwatt. 102 * 103 * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from 104 * one milliwatt (dBm) 105 * 106 * RF noise power at the antenna, decibel difference from one 107 * milliwatt. 108 * 109 * IEEE80211_RADIOTAP_DB_ANTSIGNAL u_int8_t decibel (dB) 110 * 111 * RF signal power at the antenna, decibel difference from an 112 * arbitrary, fixed reference. 113 * 114 * IEEE80211_RADIOTAP_DB_ANTNOISE u_int8_t decibel (dB) 115 * 116 * RF noise power at the antenna, decibel difference from an 117 * arbitrary, fixed reference point. 118 * 119 * IEEE80211_RADIOTAP_BARKER_CODE_LOCK u_int16_t unitless 120 * 121 * Quality of Barker code lock. Unitless. Monotonically 122 * nondecreasing with "better" lock strength. Called "Signal 123 * Quality" in datasheets. (Is there a standard way to measure 124 * this?) 125 * 126 * IEEE80211_RADIOTAP_TX_ATTENUATION u_int16_t unitless 127 * 128 * Transmit power expressed as unitless distance from max 129 * power set at factory calibration. 0 is max power. 130 * Monotonically nondecreasing with lower power levels. 131 * 132 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t decibels (dB) 133 * 134 * Transmit power expressed as decibel distance from max power 135 * set at factory calibration. 0 is max power. Monotonically 136 * nondecreasing with lower power levels. 137 * 138 * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from 139 * one milliwatt (dBm) 140 * 141 * Transmit power expressed as dBm (decibels from a 1 milliwatt 142 * reference). This is the absolute power level measured at 143 * the antenna port. 144 * 145 * IEEE80211_RADIOTAP_FLAGS u_int8_t bitmap 146 * 147 * Properties of transmitted and received frames. See flags 148 * defined below. 149 * 150 * IEEE80211_RADIOTAP_ANTENNA u_int8_t antenna index 151 * 152 * Unitless indication of the Rx/Tx antenna for this packet. 153 * The first antenna is antenna 0. 154 * 155 * IEEE80211_RADIOTAP_FCS u_int32_t data 156 * 157 * FCS from frame in network byte order. 158 * 159 * IEEE80211_RADIOTAP_HWQUEUE u_int8_t data 160 * 161 * A specific hardware queue (used by WME) 162 * 163 * IEEE80211_RADIOTAP_RSSI 2x u_int8_t RSSI, max RSSI 164 * 165 * A relative Received Signal Strength Index 166 */ 167 enum ieee80211_radiotap_type { 168 IEEE80211_RADIOTAP_TSFT = 0, 169 IEEE80211_RADIOTAP_FLAGS = 1, 170 IEEE80211_RADIOTAP_RATE = 2, 171 IEEE80211_RADIOTAP_CHANNEL = 3, 172 IEEE80211_RADIOTAP_FHSS = 4, 173 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5, 174 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6, 175 IEEE80211_RADIOTAP_LOCK_QUALITY = 7, 176 IEEE80211_RADIOTAP_TX_ATTENUATION = 8, 177 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, 178 IEEE80211_RADIOTAP_DBM_TX_POWER = 10, 179 IEEE80211_RADIOTAP_ANTENNA = 11, 180 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12, 181 IEEE80211_RADIOTAP_DB_ANTNOISE = 13, 182 IEEE80211_RADIOTAP_FCS = 14, 183 IEEE80211_RADIOTAP_HWQUEUE = 15, 184 IEEE80211_RADIOTAP_RSSI = 16, 185 IEEE80211_RADIOTAP_EXT = 31 186 }; 187 188 #ifndef _KERNEL 189 /* For IEEE80211_RADIOTAP_CHANNEL */ 190 #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */ 191 #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */ 192 #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */ 193 #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel */ 194 #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */ 195 #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */ 196 #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */ 197 #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */ 198 #define IEEE80211_CHAN_XR 0x1000 /* Extended range OFDM channel */ 199 #endif /* !_KERNEL */ 200 201 /* For IEEE80211_RADIOTAP_FLAGS */ 202 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received 203 * during CFP 204 */ 205 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received 206 * with short 207 * preamble 208 */ 209 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received 210 * with WEP encryption 211 */ 212 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received 213 * with fragmentation 214 */ 215 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */ 216 217 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */ 218