ieee80211_radiotap.h revision 1.15
1 /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5 2005/01/22 20:12:05 sam Exp $ */ 2 /* $NetBSD: ieee80211_radiotap.h,v 1.15 2006/03/12 03:22:02 dyoung Exp $ */ 3 4 /*- 5 * Copyright (c) 2003, 2004 David Young. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of David Young may not be used to endorse or promote 16 * products derived from this software without specific prior 17 * written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY 20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 22 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID 23 * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 25 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 27 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 30 * OF SUCH DAMAGE. 31 */ 32 #ifndef _NET80211_IEEE80211_RADIOTAP_H_ 33 #define _NET80211_IEEE80211_RADIOTAP_H_ 34 35 /* A generic radio capture format is desirable. It must be 36 * rigidly defined (e.g., units for fields should be given), 37 * and easily extensible. 38 * 39 * The following is an extensible radio capture format. It is 40 * based on a bitmap indicating which fields are present. 41 * 42 * I am trying to describe precisely what the application programmer 43 * should expect in the following, and for that reason I tell the 44 * units and origin of each measurement (where it applies), or else I 45 * use sufficiently weaselly language ("is a monotonically nondecreasing 46 * function of...") that I cannot set false expectations for lawyerly 47 * readers. 48 */ 49 #if defined(__KERNEL__) || defined(_KERNEL) 50 #ifndef DLT_IEEE802_11_RADIO 51 #define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */ 52 #endif 53 #endif /* defined(__KERNEL__) || defined(_KERNEL) */ 54 55 /* XXX tcpdump/libpcap do not tolerate variable-length headers, 56 * yet, so we pad every radiotap header to 64 bytes. Ugh. 57 */ 58 #define IEEE80211_RADIOTAP_HDRLEN 64 59 60 /* 61 * The radio capture header precedes the 802.11 header. 62 * 63 * Note well: all radiotap fields are little-endian. 64 */ 65 struct ieee80211_radiotap_header { 66 u_int8_t it_version; /* Version 0. Only increases 67 * for drastic changes, 68 * introduction of compatible 69 * new fields does not count. 70 */ 71 u_int8_t it_pad; 72 u_int16_t it_len; /* length of the whole 73 * header in bytes, including 74 * it_version, it_pad, 75 * it_len, and data fields. 76 */ 77 u_int32_t it_present; /* A bitmap telling which 78 * fields are present. Set bit 31 79 * (0x80000000) to extend the 80 * bitmap by another 32 bits. 81 * Additional extensions are made 82 * by setting bit 31. 83 */ 84 } __attribute__((__packed__)); 85 86 /* 87 * Name Data type Units 88 * ---- --------- ----- 89 * 90 * IEEE80211_RADIOTAP_TSFT u_int64_t microseconds 91 * 92 * Value in microseconds of the MAC's 64-bit 802.11 Time 93 * Synchronization Function timer when the first bit of the 94 * MPDU arrived at the MAC. For received frames, only. 95 * 96 * IEEE80211_RADIOTAP_CHANNEL 2 x u_int16_t MHz, bitmap 97 * 98 * Tx/Rx frequency in MHz, followed by flags (see below). 99 * 100 * IEEE80211_RADIOTAP_FHSS u_int16_t see below 101 * 102 * For frequency-hopping radios, the hop set (first byte) 103 * and pattern (second byte). 104 * 105 * IEEE80211_RADIOTAP_RATE u_int8_t 500kb/s 106 * 107 * Tx/Rx data rate 108 * 109 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from 110 * one milliwatt (dBm) 111 * 112 * RF signal power at the antenna, decibel difference from 113 * one milliwatt. 114 * 115 * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from 116 * one milliwatt (dBm) 117 * 118 * RF noise power at the antenna, decibel difference from one 119 * milliwatt. 120 * 121 * IEEE80211_RADIOTAP_DB_ANTSIGNAL u_int8_t decibel (dB) 122 * 123 * RF signal power at the antenna, decibel difference from an 124 * arbitrary, fixed reference. 125 * 126 * IEEE80211_RADIOTAP_DB_ANTNOISE u_int8_t decibel (dB) 127 * 128 * RF noise power at the antenna, decibel difference from an 129 * arbitrary, fixed reference point. 130 * 131 * IEEE80211_RADIOTAP_LOCK_QUALITY u_int16_t unitless 132 * 133 * Quality of Barker code lock. Unitless. Monotonically 134 * nondecreasing with "better" lock strength. Called "Signal 135 * Quality" in datasheets. (Is there a standard way to measure 136 * this?) 137 * 138 * IEEE80211_RADIOTAP_TX_ATTENUATION u_int16_t unitless 139 * 140 * Transmit power expressed as unitless distance from max 141 * power set at factory calibration. 0 is max power. 142 * Monotonically nondecreasing with lower power levels. 143 * 144 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t decibels (dB) 145 * 146 * Transmit power expressed as decibel distance from max power 147 * set at factory calibration. 0 is max power. Monotonically 148 * nondecreasing with lower power levels. 149 * 150 * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from 151 * one milliwatt (dBm) 152 * 153 * Transmit power expressed as dBm (decibels from a 1 milliwatt 154 * reference). This is the absolute power level measured at 155 * the antenna port. 156 * 157 * IEEE80211_RADIOTAP_FLAGS u_int8_t bitmap 158 * 159 * Properties of transmitted and received frames. See flags 160 * defined below. 161 * 162 * IEEE80211_RADIOTAP_ANTENNA u_int8_t antenna index 163 * 164 * Unitless indication of the Rx/Tx antenna for this packet. 165 * The first antenna is antenna 0. 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_EXT = 31, 183 }; 184 185 #ifndef _KERNEL 186 /* Channel flags. */ 187 #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */ 188 #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */ 189 #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */ 190 #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */ 191 #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */ 192 #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */ 193 #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */ 194 #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */ 195 #endif /* !_KERNEL */ 196 197 /* For IEEE80211_RADIOTAP_FLAGS */ 198 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received 199 * during CFP 200 */ 201 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received 202 * with short 203 * preamble 204 */ 205 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received 206 * with WEP encryption 207 */ 208 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received 209 * with fragmentation 210 */ 211 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */ 212 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between 213 * 802.11 header and payload 214 * (to 32-bit boundary) 215 */ 216 #define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */ 217 218 #endif /* !_NET80211_IEEE80211_RADIOTAP_H_ */ 219
Indexes created Tue Sep 30 11:09:46 GMT 2025