ieee80211_radiotap.h revision 1.22
1 /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.11 2007/12/13 01:23:40 sa 2 m Exp $ */ 3 /* $NetBSD: ieee80211_radiotap.h,v 1.22 2011/02/25 08:01:49 cegger 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 _NET80211_IEEE80211_RADIOTAP_H_ 31 #define _NET80211_IEEE80211_RADIOTAP_H_ 32 33 /* A generic radio capture format is desirable. It must be 34 * rigidly defined (e.g., units for fields should be given), 35 * and easily extensible. 36 * 37 * The following is an 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 #if defined(__KERNEL__) || defined(_KERNEL) 48 #ifndef DLT_IEEE802_11_RADIO 49 #define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */ 50 #endif 51 #endif /* defined(__KERNEL__) || defined(_KERNEL) */ 52 53 /* XXX tcpdump/libpcap do not tolerate variable-length headers, 54 * yet, so we pad every radiotap header to 64 bytes. Ugh. 55 */ 56 #define IEEE80211_RADIOTAP_HDRLEN 64 57 58 /* 59 * The radio capture header precedes the 802.11 header. 60 * 61 * Note well: all radiotap fields are little-endian. 62 */ 63 struct ieee80211_radiotap_header { 64 uint8_t it_version; /* Version 0. Only increases 65 * for drastic changes, 66 * introduction of compatible 67 * new fields does not count. 68 */ 69 uint8_t it_pad; 70 uint16_t it_len; /* length of the whole 71 * header in bytes, including 72 * it_version, it_pad, 73 * it_len, and data fields. 74 */ 75 uint32_t it_present; /* A bitmap telling which 76 * fields are present. Set bit 31 77 * (0x80000000) to extend the 78 * bitmap by another 32 bits. 79 * Additional extensions are made 80 * by setting bit 31. 81 */ 82 } __packed __aligned(8); 83 84 /* 85 * Name Data type Units 86 * ---- --------- ----- 87 * 88 * IEEE80211_RADIOTAP_TSFT uint64_t microseconds 89 * 90 * Value in microseconds of the MAC's 64-bit 802.11 Time 91 * Synchronization Function timer when the first bit of the 92 * MPDU arrived at the MAC. For received frames, only. 93 * 94 * IEEE80211_RADIOTAP_CHANNEL 2 x uint16_t MHz, bitmap 95 * 96 * Tx/Rx frequency in MHz, followed by flags (see below). 97 * 98 * IEEE80211_RADIOTAP_FHSS uint16_t see below 99 * 100 * For frequency-hopping radios, the hop set (first byte) 101 * and pattern (second byte). 102 * 103 * IEEE80211_RADIOTAP_RATE uint8_t 500kb/s 104 * 105 * Tx/Rx data rate 106 * 107 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from 108 * one milliwatt (dBm) 109 * 110 * RF signal power at the antenna, decibel difference from 111 * one milliwatt. 112 * 113 * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from 114 * one milliwatt (dBm) 115 * 116 * RF noise power at the antenna, decibel difference from one 117 * milliwatt. 118 * 119 * IEEE80211_RADIOTAP_DB_ANTSIGNAL uint8_t decibel (dB) 120 * 121 * RF signal power at the antenna, decibel difference from an 122 * arbitrary, fixed reference. 123 * 124 * IEEE80211_RADIOTAP_DB_ANTNOISE uint8_t decibel (dB) 125 * 126 * RF noise power at the antenna, decibel difference from an 127 * arbitrary, fixed reference point. 128 * 129 * IEEE80211_RADIOTAP_LOCK_QUALITY uint16_t unitless 130 * 131 * Quality of Barker code lock. Unitless. Monotonically 132 * nondecreasing with "better" lock strength. Called "Signal 133 * Quality" in datasheets. (Is there a standard way to measure 134 * this?) 135 * 136 * IEEE80211_RADIOTAP_TX_ATTENUATION uint16_t unitless 137 * 138 * Transmit power expressed as unitless distance from max 139 * power set at factory calibration. 0 is max power. 140 * Monotonically nondecreasing with lower power levels. 141 * 142 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t decibels (dB) 143 * 144 * Transmit power expressed as decibel distance from max power 145 * set at factory calibration. 0 is max power. Monotonically 146 * nondecreasing with lower power levels. 147 * 148 * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from 149 * one milliwatt (dBm) 150 * 151 * Transmit power expressed as dBm (decibels from a 1 milliwatt 152 * reference). This is the absolute power level measured at 153 * the antenna port. 154 * 155 * IEEE80211_RADIOTAP_FLAGS uint8_t bitmap 156 * 157 * Properties of transmitted and received frames. See flags 158 * defined below. 159 * 160 * IEEE80211_RADIOTAP_ANTENNA uint8_t antenna index 161 * 162 * Unitless indication of the Rx/Tx antenna for this packet. 163 * The first antenna is antenna 0. 164 * 165 * IEEE80211_RADIOTAP_RX_FLAGS uint16_t bitmap 166 * 167 * Properties of received frames. See flags defined below. 168 * 169 * IEEE80211_RADIOTAP_TX_FLAGS uint16_t bitmap 170 * 171 * Properties of transmitted frames. See flags defined below. 172 * 173 * IEEE80211_RADIOTAP_RTS_RETRIES uint8_t data 174 * 175 * Number of rts retries a transmitted frame used. 176 * 177 * IEEE80211_RADIOTAP_DATA_RETRIES uint8_t data 178 * 179 * Number of unicast retries a transmitted frame used. 180 * 181 * IEEE80211_RADIOTAP_XCHANNEL uint32_t bitmap 182 * uint16_t MHz 183 * uint8_t channel number 184 * int8_t .5 dBm 185 * 186 * Extended channel specification: flags (see below) followed by 187 * frequency in MHz, the corresponding IEEE channel number, and 188 * finally the maximum regulatory transmit power cap in .5 dBm 189 * units. This property supersedes IEEE80211_RADIOTAP_CHANNEL 190 * and only one of the two should be present. 191 */ 192 enum ieee80211_radiotap_type { 193 IEEE80211_RADIOTAP_TSFT = 0, 194 IEEE80211_RADIOTAP_FLAGS = 1, 195 IEEE80211_RADIOTAP_RATE = 2, 196 IEEE80211_RADIOTAP_CHANNEL = 3, 197 IEEE80211_RADIOTAP_FHSS = 4, 198 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5, 199 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6, 200 IEEE80211_RADIOTAP_LOCK_QUALITY = 7, 201 IEEE80211_RADIOTAP_TX_ATTENUATION = 8, 202 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, 203 IEEE80211_RADIOTAP_DBM_TX_POWER = 10, 204 IEEE80211_RADIOTAP_ANTENNA = 11, 205 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12, 206 IEEE80211_RADIOTAP_DB_ANTNOISE = 13, 207 IEEE80211_RADIOTAP_RX_FLAGS = 14, 208 IEEE80211_RADIOTAP_TX_FLAGS = 15, 209 IEEE80211_RADIOTAP_RTS_RETRIES = 16, 210 IEEE80211_RADIOTAP_DATA_RETRIES = 17, 211 IEEE80211_RADIOTAP_XCHANNEL = 18, 212 IEEE80211_RADIOTAP_EXT = 31 213 }; 214 215 #ifndef _KERNEL 216 /* Channel flags. */ 217 #define IEEE80211_CHAN_TURBO 0x00000010 /* Turbo channel */ 218 #define IEEE80211_CHAN_CCK 0x00000020 /* CCK channel */ 219 #define IEEE80211_CHAN_OFDM 0x00000040 /* OFDM channel */ 220 #define IEEE80211_CHAN_2GHZ 0x00000080 /* 2 GHz spectrum channel. */ 221 #define IEEE80211_CHAN_5GHZ 0x00000100 /* 5 GHz spectrum channel */ 222 #define IEEE80211_CHAN_PASSIVE 0x00000200 /* Only passive scan allowed */ 223 #define IEEE80211_CHAN_DYN 0x00000400 /* Dynamic CCK-OFDM channel */ 224 #define IEEE80211_CHAN_GFSK 0x00000800 /* GFSK channel (FHSS PHY) */ 225 #define IEEE80211_CHAN_GSM 0x00001000 /* 900 MHz spectrum channel */ 226 #define IEEE80211_CHAN_STURBO 0x00002000 /* 11a static turbo channel only */ 227 #define IEEE80211_CHAN_HALF 0x00004000 /* Half rate channel */ 228 #define IEEE80211_CHAN_QUARTER 0x00008000 /* Quarter rate channel */ 229 #endif /* !_KERNEL */ 230 231 /* For IEEE80211_RADIOTAP_FLAGS */ 232 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received 233 * during CFP 234 */ 235 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received 236 * with short 237 * preamble 238 */ 239 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received 240 * with WEP encryption 241 */ 242 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received 243 * with fragmentation 244 */ 245 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */ 246 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between 247 * 802.11 header and payload 248 * (to 32-bit boundary) 249 */ 250 #define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */ 251 #define IEEE80211_RADIOTAP_F_SHORTGI 0x80 /* HT short GI */ 252 253 /* For IEEE80211_RADIOTAP_RX_FLAGS */ 254 #define IEEE80211_RADIOTAP_F_RX_BADFCS 0x0001 /* Frame failed CRC check. 255 * 256 * Deprecated: use the flag 257 * IEEE80211_RADIOTAP_F_BADFCS in 258 * the IEEE80211_RADIOTAP_FLAGS 259 * field, instead. 260 */ 261 262 /* For IEEE80211_RADIOTAP_TX_FLAGS */ 263 #define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive 264 * retries 265 */ 266 #define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */ 267 #define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */ 268 269 #endif /* !_NET80211_IEEE80211_RADIOTAP_H_ */ 270
Indexes created Mon Sep 29 21:09:56 GMT 2025