ieee802_11_radio.h revision 146773
1/* $FreeBSD: vendor/tcpdump/dist/contrib/tcpdump/ieee802_11_radio.h 146773 2005-05-29 18:17:16Z sam $ */ 2/* $NetBSD: ieee80211_radiotap.h,v 1.3 2003/11/16 09:02:42 dyoung Exp $ */ 3/* $Header: /tcpdump/master/tcpdump/ieee802_11_radio.h,v 1.1 2004/09/23 21:33:10 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 * 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/* A generic radio capture format is desirable. There is one for 37 * Linux, but it is neither rigidly defined (there were not even 38 * units given for some fields) nor easily extensible. 39 * 40 * I suggest the following extensible radio capture format. It is 41 * based on a bitmap indicating which fields are present. 42 * 43 * I am trying to describe precisely what the application programmer 44 * should expect in the following, and for that reason I tell the 45 * units and origin of each measurement (where it applies), or else I 46 * use sufficiently weaselly language ("is a monotonically nondecreasing 47 * function of...") that I cannot set false expectations for lawyerly 48 * readers. 49 */ 50#ifdef _KERNEL 51#ifndef DLT_IEEE802_11_RADIO 52#define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */ 53#endif 54#endif /* _KERNEL */ 55 56/* The radio capture header precedes the 802.11 header. */ 57struct ieee80211_radiotap_header { 58 u_int8_t it_version; /* Version 0. Only increases 59 * for drastic changes, 60 * introduction of compatible 61 * new fields does not count. 62 */ 63 u_int8_t it_pad; 64 u_int16_t it_len; /* length of the whole 65 * header in bytes, including 66 * it_version, it_pad, 67 * it_len, and data fields. 68 */ 69 u_int32_t it_present; /* A bitmap telling which 70 * fields are present. Set bit 31 71 * (0x80000000) to extend the 72 * bitmap by another 32 bits. 73 * Additional extensions are made 74 * by setting bit 31. 75 */ 76} __attribute__((__packed__)); 77 78/* Name Data type Units 79 * ---- --------- ----- 80 * 81 * IEEE80211_RADIOTAP_TSFT u_int64_t microseconds 82 * 83 * Value in microseconds of the MAC's 64-bit 802.11 Time 84 * Synchronization Function timer when the first bit of the 85 * MPDU arrived at the MAC. For received frames, only. 86 * 87 * IEEE80211_RADIOTAP_CHANNEL 2 x u_int16_t MHz, bitmap 88 * 89 * Tx/Rx frequency in MHz, followed by flags (see below). 90 * 91 * IEEE80211_RADIOTAP_FHSS u_int16_t see below 92 * 93 * For frequency-hopping radios, the hop set (first byte) 94 * and pattern (second byte). 95 * 96 * IEEE80211_RADIOTAP_RATE u_int8_t 500kb/s 97 * 98 * Tx/Rx data rate 99 * 100 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from 101 * one milliwatt (dBm) 102 * 103 * RF signal power at the antenna, decibel difference from 104 * one milliwatt. 105 * 106 * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from 107 * one milliwatt (dBm) 108 * 109 * RF noise power at the antenna, decibel difference from one 110 * milliwatt. 111 * 112 * IEEE80211_RADIOTAP_DB_ANTSIGNAL u_int8_t decibel (dB) 113 * 114 * RF signal power at the antenna, decibel difference from an 115 * arbitrary, fixed reference. 116 * 117 * IEEE80211_RADIOTAP_DB_ANTNOISE u_int8_t decibel (dB) 118 * 119 * RF noise power at the antenna, decibel difference from an 120 * arbitrary, fixed reference point. 121 * 122 * IEEE80211_RADIOTAP_BARKER_CODE_LOCK u_int16_t unitless 123 * 124 * Quality of Barker code lock. Unitless. Monotonically 125 * nondecreasing with "better" lock strength. Called "Signal 126 * Quality" in datasheets. (Is there a standard way to measure 127 * this?) 128 * 129 * IEEE80211_RADIOTAP_TX_ATTENUATION u_int16_t unitless 130 * 131 * Transmit power expressed as unitless distance from max 132 * power set at factory calibration. 0 is max power. 133 * Monotonically nondecreasing with lower power levels. 134 * 135 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t decibels (dB) 136 * 137 * Transmit power expressed as decibel distance from max power 138 * set at factory calibration. 0 is max power. Monotonically 139 * nondecreasing with lower power levels. 140 * 141 * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from 142 * one milliwatt (dBm) 143 * 144 * Transmit power expressed as dBm (decibels from a 1 milliwatt 145 * reference). This is the absolute power level measured at 146 * the antenna port. 147 * 148 * IEEE80211_RADIOTAP_FLAGS u_int8_t bitmap 149 * 150 * Properties of transmitted and received frames. See flags 151 * defined below. 152 * 153 * IEEE80211_RADIOTAP_ANTENNA u_int8_t antenna index 154 * 155 * Unitless indication of the Rx/Tx antenna for this packet. 156 * The first antenna is antenna 0. 157 */ 158enum ieee80211_radiotap_type { 159 IEEE80211_RADIOTAP_TSFT = 0, 160 IEEE80211_RADIOTAP_FLAGS = 1, 161 IEEE80211_RADIOTAP_RATE = 2, 162 IEEE80211_RADIOTAP_CHANNEL = 3, 163 IEEE80211_RADIOTAP_FHSS = 4, 164 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5, 165 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6, 166 IEEE80211_RADIOTAP_LOCK_QUALITY = 7, 167 IEEE80211_RADIOTAP_TX_ATTENUATION = 8, 168 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, 169 IEEE80211_RADIOTAP_DBM_TX_POWER = 10, 170 IEEE80211_RADIOTAP_ANTENNA = 11, 171 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12, 172 IEEE80211_RADIOTAP_DB_ANTNOISE = 13, 173 IEEE80211_RADIOTAP_EXT = 31 174}; 175 176#ifndef _KERNEL 177/* Channel flags. */ 178#define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */ 179#define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */ 180#define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */ 181#define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */ 182#define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */ 183#define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */ 184#endif /* !_KERNEL */ 185 186/* For IEEE80211_RADIOTAP_FLAGS */ 187#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received 188 * during CFP 189 */ 190#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received 191 * with short 192 * preamble 193 */ 194#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received 195 * with WEP encryption 196 */ 197#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received 198 * with fragmentation 199 */ 200 201#endif /* _NET_IF_IEEE80211RADIOTAP_H_ */ 202