1 /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5.2.1 2006/01/29 07:13:58 sam Exp $ */ 2 /* $NetBSD: ieee80211_radiotap.h,v 1.10 2005/01/04 00:34:58 dyoung Exp $ */ 3 /* $DragonFly: src/sys/netproto/802_11/ieee80211_radiotap.h,v 1.3 2006/12/25 14:42:36 sephe 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 * 3. The name of David Young may not be used to endorse or promote 17 * products derived from this software without specific prior 18 * written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY 21 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 23 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID 24 * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 26 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 28 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 31 * OF SUCH DAMAGE. 32 */ 33 #ifndef _NET_IF_IEEE80211RADIOTAP_H_ 34 #define _NET_IF_IEEE80211RADIOTAP_H_ 35 36 /* 37 * A generic radio capture format is desirable. It must be 38 * rigidly defined (e.g., units for fields should be given), 39 * and easily extensible. 40 * 41 * The following is an extensible radio capture format. It is 42 * based on a bitmap indicating which fields are present. 43 * 44 * I am trying to describe precisely what the application programmer 45 * should expect in the following, and for that reason I tell the 46 * units and origin of each measurement (where it applies), or else I 47 * use sufficiently weaselly language ("is a monotonically nondecreasing 48 * function of...") that I cannot set false expectations for lawyerly 49 * readers. 50 */ 51 #if defined(__KERNEL__) || defined(_KERNEL) 52 #ifndef DLT_IEEE802_11_RADIO 53 #define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */ 54 #endif 55 #endif /* defined(__KERNEL__) || defined(_KERNEL) */ 56 57 /* 58 * XXX tcpdump/libpcap do not tolerate variable-length headers, 59 * yet, so we pad every radiotap header to 64 bytes. Ugh. 60 */ 61 #define IEEE80211_RADIOTAP_HDRLEN 64 62 63 /* 64 * The radio capture header precedes the 802.11 header. 65 * 66 * Note well: all radiotap fields are little-endian. 67 */ 68 struct ieee80211_radiotap_header { 69 uint8_t it_version; /* Version 0. Only increases 70 * for drastic changes, 71 * introduction of compatible 72 * new fields does not count. 73 */ 74 uint8_t it_pad; 75 uint16_t it_len; /* length of the whole 76 * header in bytes, including 77 * it_version, it_pad, 78 * it_len, and data fields. 79 */ 80 uint32_t it_present; /* A bitmap telling which 81 * fields are present. Set bit 31 82 * (0x80000000) to extend the 83 * bitmap by another 32 bits. 84 * Additional extensions are made 85 * by setting bit 31. 86 */ 87 } __packed; 88 89 /* 90 * Name Data type Units 91 * ---- --------- ----- 92 * 93 * IEEE80211_RADIOTAP_TSFT uint64_t microseconds 94 * 95 * Value in microseconds of the MAC's 64-bit 802.11 Time 96 * Synchronization Function timer when the first bit of the 97 * MPDU arrived at the MAC. For received frames, only. 98 * 99 * IEEE80211_RADIOTAP_CHANNEL 2 x uint16_t MHz, bitmap 100 * 101 * Tx/Rx frequency in MHz, followed by flags (see below). 102 * 103 * IEEE80211_RADIOTAP_FHSS uint16_t see below 104 * 105 * For frequency-hopping radios, the hop set (first byte) 106 * and pattern (second byte). 107 * 108 * IEEE80211_RADIOTAP_RATE uint8_t 500kb/s 109 * 110 * Tx/Rx data rate 111 * 112 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from 113 * one milliwatt (dBm) 114 * 115 * RF signal power at the antenna, decibel difference from 116 * one milliwatt. 117 * 118 * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from 119 * one milliwatt (dBm) 120 * 121 * RF noise power at the antenna, decibel difference from one 122 * milliwatt. 123 * 124 * IEEE80211_RADIOTAP_DB_ANTSIGNAL uint8_t decibel (dB) 125 * 126 * RF signal power at the antenna, decibel difference from an 127 * arbitrary, fixed reference. 128 * 129 * IEEE80211_RADIOTAP_DB_ANTNOISE uint8_t decibel (dB) 130 * 131 * RF noise power at the antenna, decibel difference from an 132 * arbitrary, fixed reference point. 133 * 134 * IEEE80211_RADIOTAP_LOCK_QUALITY uint16_t unitless 135 * 136 * Quality of Barker code lock. Unitless. Monotonically 137 * nondecreasing with "better" lock strength. Called "Signal 138 * Quality" in datasheets. (Is there a standard way to measure 139 * this?) 140 * 141 * IEEE80211_RADIOTAP_TX_ATTENUATION uint16_t unitless 142 * 143 * Transmit power expressed as unitless distance from max 144 * power set at factory calibration. 0 is max power. 145 * Monotonically nondecreasing with lower power levels. 146 * 147 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t decibels (dB) 148 * 149 * Transmit power expressed as decibel distance from max power 150 * set at factory calibration. 0 is max power. Monotonically 151 * nondecreasing with lower power levels. 152 * 153 * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from 154 * one milliwatt (dBm) 155 * 156 * Transmit power expressed as dBm (decibels from a 1 milliwatt 157 * reference). This is the absolute power level measured at 158 * the antenna port. 159 * 160 * IEEE80211_RADIOTAP_FLAGS uint8_t bitmap 161 * 162 * Properties of transmitted and received frames. See flags 163 * defined below. 164 * 165 * IEEE80211_RADIOTAP_ANTENNA uint8_t antenna index 166 * 167 * Unitless indication of the Rx/Tx antenna for this packet. 168 * The first antenna is antenna 0. 169 */ 170 enum ieee80211_radiotap_type { 171 IEEE80211_RADIOTAP_TSFT = 0, 172 IEEE80211_RADIOTAP_FLAGS = 1, 173 IEEE80211_RADIOTAP_RATE = 2, 174 IEEE80211_RADIOTAP_CHANNEL = 3, 175 IEEE80211_RADIOTAP_FHSS = 4, 176 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5, 177 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6, 178 IEEE80211_RADIOTAP_LOCK_QUALITY = 7, 179 IEEE80211_RADIOTAP_TX_ATTENUATION = 8, 180 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, 181 IEEE80211_RADIOTAP_DBM_TX_POWER = 10, 182 IEEE80211_RADIOTAP_ANTENNA = 11, 183 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12, 184 IEEE80211_RADIOTAP_DB_ANTNOISE = 13, 185 IEEE80211_RADIOTAP_EXT = 31, 186 }; 187 188 #ifndef _KERNEL 189 /* Channel flags. */ 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 #endif /* !_KERNEL */ 199 200 /* For IEEE80211_RADIOTAP_FLAGS */ 201 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received 202 * during CFP 203 */ 204 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received 205 * with short 206 * preamble 207 */ 208 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received 209 * with WEP encryption 210 */ 211 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received 212 * with fragmentation 213 */ 214 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */ 215 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between 216 * 802.11 header and payload 217 * (to 32-bit boundary) 218 */ 219 #define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */ 220 221 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */ 222