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 1.2 2006/05/18 13:51:46 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. There is one for 38 * Linux, but it is neither rigidly defined (there were not even 39 * units given for some fields) nor easily extensible. 40 * 41 * I suggest the following 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 /* The radio capture header precedes the 802.11 header. */ 64 struct ieee80211_radiotap_header { 65 uint8_t it_version; /* Version 0. Only increases 66 * for drastic changes, 67 * introduction of compatible 68 * new fields does not count. 69 */ 70 uint8_t it_pad; 71 uint16_t it_len; /* length of the whole 72 * header in bytes, including 73 * it_version, it_pad, 74 * it_len, and data fields. 75 */ 76 uint32_t it_present; /* A bitmap telling which 77 * fields are present. Set bit 31 78 * (0x80000000) to extend the 79 * bitmap by another 32 bits. 80 * Additional extensions are made 81 * by setting bit 31. 82 */ 83 } __packed; 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_FCS uint32_t data 166 * 167 * FCS from frame in network byte order. 168 */ 169 enum ieee80211_radiotap_type { 170 IEEE80211_RADIOTAP_TSFT = 0, 171 IEEE80211_RADIOTAP_FLAGS = 1, 172 IEEE80211_RADIOTAP_RATE = 2, 173 IEEE80211_RADIOTAP_CHANNEL = 3, 174 IEEE80211_RADIOTAP_FHSS = 4, 175 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5, 176 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6, 177 IEEE80211_RADIOTAP_LOCK_QUALITY = 7, 178 IEEE80211_RADIOTAP_TX_ATTENUATION = 8, 179 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, 180 IEEE80211_RADIOTAP_DBM_TX_POWER = 10, 181 IEEE80211_RADIOTAP_ANTENNA = 11, 182 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12, 183 IEEE80211_RADIOTAP_DB_ANTNOISE = 13, 184 IEEE80211_RADIOTAP_EXT = 31, 185 }; 186 187 #ifndef _KERNEL 188 /* Channel flags. */ 189 #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */ 190 #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */ 191 #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */ 192 #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */ 193 #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */ 194 #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */ 195 #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */ 196 #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */ 197 #endif /* !_KERNEL */ 198 199 /* For IEEE80211_RADIOTAP_FLAGS */ 200 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received 201 * during CFP 202 */ 203 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received 204 * with short 205 * preamble 206 */ 207 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received 208 * with WEP encryption 209 */ 210 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received 211 * with fragmentation 212 */ 213 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */ 214 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between 215 * 802.11 header and payload 216 * (to 32-bit boundary) 217 */ 218 #define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */ 219 220 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */ 221