ieee80211_radiotap.h revision 1.3
1 /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.1 2003/09/05 22:19:32 sam Exp $ */ 2 /* $NetBSD: ieee80211_radiotap.h,v 1.3 2003/11/16 09:02:42 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 _NET_IF_IEEE80211RADIOTAP_H_ 33 #define _NET_IF_IEEE80211RADIOTAP_H_ 34 35 /* A generic radio capture format is desirable. There is one for 36 * Linux, but it is neither rigidly defined (there were not even 37 * units given for some fields) nor easily extensible. 38 * 39 * I suggest the following 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 #ifndef DLT_IEEE802_11_RADIO 50 #define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */ 51 #endif 52 53 /* The radio capture header precedes the 802.11 header. */ 54 struct ieee80211_radiotap_header { 55 u_int8_t it_version; /* Version 0. Only increases 56 * for drastic changes, 57 * introduction of compatible 58 * new fields does not count. 59 */ 60 u_int8_t it_pad; 61 u_int16_t it_len; /* length of the whole 62 * header in bytes, including 63 * it_version, it_pad, 64 * it_len, and data fields. 65 */ 66 u_int32_t it_present; /* A bitmap telling which 67 * fields are present. Set bit 31 68 * (0x80000000) to extend the 69 * bitmap by another 32 bits. 70 * Additional extensions are made 71 * by setting bit 31. 72 */ 73 } __attribute__((__packed__)); 74 75 /* Name Data type Units 76 * ---- --------- ----- 77 * 78 * IEEE80211_RADIOTAP_TSFT u_int64_t microseconds 79 * 80 * Value in microseconds of the MAC's 64-bit 802.11 Time 81 * Synchronization Function timer when the first bit of the 82 * MPDU arrived at the MAC. For received frames, only. 83 * 84 * IEEE80211_RADIOTAP_CHANNEL 2 x u_int16_t MHz, bitmap 85 * 86 * Tx/Rx frequency in MHz, followed by flags (see below). 87 * 88 * IEEE80211_RADIOTAP_FHSS u_int16_t see below 89 * 90 * For frequency-hopping radios, the hop set (first byte) 91 * and pattern (second byte). 92 * 93 * IEEE80211_RADIOTAP_RATE u_int16_t 500kb/s 94 * 95 * Tx/Rx data rate 96 * 97 * IEEE80211_RADIOTAP_DB_ANTSIGNAL int8_t decibel (dB) 98 * 99 * RF signal power at the antenna, measured from a fixed, 100 * arbitrary reference point. 101 * 102 * IEEE80211_RADIOTAP_DB_ANTNOISE int8_t decibel (dB) 103 * 104 * RF noise power at the antenna in decibels from an arbitrary, 105 * fixed reference point. 106 * 107 * IEEE80211_RADIOTAP_BARKER_CODE_LOCK u_int16_t unitless 108 * 109 * Quality of Barker code lock. Unitless. Monotonically 110 * nondecreasing with "better" lock strength. Called "Signal 111 * Quality" in datasheets. (Is there a standard way to measure 112 * this?) 113 * 114 * IEEE80211_RADIOTAP_TX_ATTENUATION u_int16_t unitless 115 * 116 * Transmit power expressed as unitless distance from max 117 * power set at factory calibration. 0 is max power. 118 * Monotonically nondecreasing with lower power levels. 119 * 120 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t decibels (dB) 121 * 122 * Transmit power expressed as decibel distance from max power 123 * set at factory calibration. 0 is max power. Monotonically 124 * nondecreasing with lower power levels. 125 * 126 * IEEE80211_RADIOTAP_DBM_TX_POWER u_int16_t decibels from 127 * milliwatt (dBm) 128 * 129 * Transmit power expressed as dBm (decibels from a 1 milliwatt 130 * reference). This is the absolute power level measured at 131 * the antenna port. 132 * 133 * IEEE80211_RADIOTAP_FLAGS u_int8_t bitmap 134 * 135 * Properties of transmitted and received frames. See flags 136 * defined below. 137 * 138 * IEEE80211_RADIOTAP_ANTENNA u_int8_t antenna index 139 * 140 * Unitless indication of the Rx/Tx antenna for this packet. 141 * The first antenna is antenna 0. 142 */ 143 enum ieee80211_radiotap_type { 144 IEEE80211_RADIOTAP_TSFT = 0, 145 IEEE80211_RADIOTAP_FLAGS = 1, 146 IEEE80211_RADIOTAP_RATE = 2, 147 IEEE80211_RADIOTAP_CHANNEL = 3, 148 IEEE80211_RADIOTAP_FHSS = 4, 149 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 5, 150 IEEE80211_RADIOTAP_DB_ANTNOISE = 6, 151 IEEE80211_RADIOTAP_LOCK_QUALITY = 7, 152 IEEE80211_RADIOTAP_TX_ATTENUATION = 8, 153 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, 154 IEEE80211_RADIOTAP_DBM_TX_POWER = 10, 155 IEEE80211_RADIOTAP_ANTENNA = 11, 156 IEEE80211_RADIOTAP_EXT = 31 157 }; 158 159 /* For IEEE80211_RADIOTAP_FLAGS */ 160 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received 161 * during CFP 162 */ 163 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received 164 * with short 165 * preamble 166 */ 167 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received 168 * with WEP encryption 169 */ 170 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received 171 * with fragmentation 172 */ 173 174 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */ 175
Indexes created Mon Sep 29 21:09:56 GMT 2025