00001 /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5 2005/01/22 20:12:05 sam Exp $ */ 00002 /* $NetBSD: ieee80211_radiotap.h,v 1.10 2005/01/04 00:34:58 dyoung Exp $ */ 00003 00004 /*- 00005 * Copyright (c) 2003, 2004 David Young. All rights reserved. 00006 * 00007 * Redistribution and use in source and binary forms, with or without 00008 * modification, are permitted provided that the following conditions 00009 * are met: 00010 * 1. Redistributions of source code must retain the above copyright 00011 * notice, this list of conditions and the following disclaimer. 00012 * 2. Redistributions in binary form must reproduce the above copyright 00013 * notice, this list of conditions and the following disclaimer in the 00014 * documentation and/or other materials provided with the distribution. 00015 * 3. The name of David Young may not be used to endorse or promote 00016 * products derived from this software without specific prior 00017 * written permission. 00018 * 00019 * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY 00020 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 00021 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 00022 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID 00023 * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00024 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00025 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00026 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 00027 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00028 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00029 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00030 * OF SUCH DAMAGE. 00031 */ 00032 #ifndef _NET_IF_IEEE80211RADIOTAP_H_ 00033 #define _NET_IF_IEEE80211RADIOTAP_H_ 00034 00035 /* A generic radio capture format is desirable. There is one for 00036 * Linux, but it is neither rigidly defined (there were not even 00037 * units given for some fields) nor easily extensible. 00038 * 00039 * I suggest the following extensible radio capture format. It is 00040 * based on a bitmap indicating which fields are present. 00041 * 00042 * I am trying to describe precisely what the application programmer 00043 * should expect in the following, and for that reason I tell the 00044 * units and origin of each measurement (where it applies), or else I 00045 * use sufficiently weaselly language ("is a monotonically nondecreasing 00046 * function of...") that I cannot set false expectations for lawyerly 00047 * readers. 00048 */ 00049 #if defined(__KERNEL__) || defined(_KERNEL) 00050 #ifndef DLT_IEEE802_11_RADIO 00051 #define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */ 00052 #endif 00053 #endif /* defined(__KERNEL__) || defined(_KERNEL) */ 00054 00055 /* XXX tcpdump/libpcap do not tolerate variable-length headers, 00056 * yet, so we pad every radiotap header to 64 bytes. Ugh. 00057 */ 00058 #define IEEE80211_RADIOTAP_HDRLEN 64 00059 00060 /* The radio capture header precedes the 802.11 header. */ 00061 struct ieee80211_radiotap_header { 00062 u_int8_t it_version; /* Version 0. Only increases 00063 * for drastic changes, 00064 * introduction of compatible 00065 * new fields does not count. 00066 */ 00067 u_int8_t it_pad; 00068 u_int16_t it_len; /* length of the whole 00069 * header in bytes, including 00070 * it_version, it_pad, 00071 * it_len, and data fields. 00072 */ 00073 u_int32_t it_present; /* A bitmap telling which 00074 * fields are present. Set bit 31 00075 * (0x80000000) to extend the 00076 * bitmap by another 32 bits. 00077 * Additional extensions are made 00078 * by setting bit 31. 00079 */ 00080 } __attribute__((__packed__)); 00081 00082 /* Name Data type Units 00083 * ---- --------- ----- 00084 * 00085 * IEEE80211_RADIOTAP_TSFT u_int64_t microseconds 00086 * 00087 * Value in microseconds of the MAC's 64-bit 802.11 Time 00088 * Synchronization Function timer when the first bit of the 00089 * MPDU arrived at the MAC. For received frames, only. 00090 * 00091 * IEEE80211_RADIOTAP_CHANNEL 2 x u_int16_t MHz, bitmap 00092 * 00093 * Tx/Rx frequency in MHz, followed by flags (see below). 00094 * 00095 * IEEE80211_RADIOTAP_FHSS u_int16_t see below 00096 * 00097 * For frequency-hopping radios, the hop set (first byte) 00098 * and pattern (second byte). 00099 * 00100 * IEEE80211_RADIOTAP_RATE u_int8_t 500kb/s 00101 * 00102 * Tx/Rx data rate 00103 * 00104 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from 00105 * one milliwatt (dBm) 00106 * 00107 * RF signal power at the antenna, decibel difference from 00108 * one milliwatt. 00109 * 00110 * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from 00111 * one milliwatt (dBm) 00112 * 00113 * RF noise power at the antenna, decibel difference from one 00114 * milliwatt. 00115 * 00116 * IEEE80211_RADIOTAP_DB_ANTSIGNAL u_int8_t decibel (dB) 00117 * 00118 * RF signal power at the antenna, decibel difference from an 00119 * arbitrary, fixed reference. 00120 * 00121 * IEEE80211_RADIOTAP_DB_ANTNOISE u_int8_t decibel (dB) 00122 * 00123 * RF noise power at the antenna, decibel difference from an 00124 * arbitrary, fixed reference point. 00125 * 00126 * IEEE80211_RADIOTAP_LOCK_QUALITY u_int16_t unitless 00127 * 00128 * Quality of Barker code lock. Unitless. Monotonically 00129 * nondecreasing with "better" lock strength. Called "Signal 00130 * Quality" in datasheets. (Is there a standard way to measure 00131 * this?) 00132 * 00133 * IEEE80211_RADIOTAP_TX_ATTENUATION u_int16_t unitless 00134 * 00135 * Transmit power expressed as unitless distance from max 00136 * power set at factory calibration. 0 is max power. 00137 * Monotonically nondecreasing with lower power levels. 00138 * 00139 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t decibels (dB) 00140 * 00141 * Transmit power expressed as decibel distance from max power 00142 * set at factory calibration. 0 is max power. Monotonically 00143 * nondecreasing with lower power levels. 00144 * 00145 * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from 00146 * one milliwatt (dBm) 00147 * 00148 * Transmit power expressed as dBm (decibels from a 1 milliwatt 00149 * reference). This is the absolute power level measured at 00150 * the antenna port. 00151 * 00152 * IEEE80211_RADIOTAP_FLAGS u_int8_t bitmap 00153 * 00154 * Properties of transmitted and received frames. See flags 00155 * defined below. 00156 * 00157 * IEEE80211_RADIOTAP_ANTENNA u_int8_t antenna index 00158 * 00159 * Unitless indication of the Rx/Tx antenna for this packet. 00160 * The first antenna is antenna 0. 00161 * 00162 * IEEE80211_RADIOTAP_RX_FLAGS u_int16_t bitmap 00163 * 00164 * Properties of received frames. See flags defined below. 00165 * 00166 * IEEE80211_RADIOTAP_TX_FLAGS u_int16_t bitmap 00167 * 00168 * Properties of transmitted frames. See flags defined below. 00169 * 00170 * IEEE80211_RADIOTAP_RTS_RETRIES u_int8_t data 00171 * 00172 * Number of rts retries a transmitted frame used. 00173 * 00174 * IEEE80211_RADIOTAP_DATA_RETRIES u_int8_t data 00175 * 00176 * Number of unicast retries a transmitted frame used. 00177 * 00178 */ 00179 enum ieee80211_radiotap_type { 00180 IEEE80211_RADIOTAP_TSFT = 0, 00181 IEEE80211_RADIOTAP_FLAGS = 1, 00182 IEEE80211_RADIOTAP_RATE = 2, 00183 IEEE80211_RADIOTAP_CHANNEL = 3, 00184 IEEE80211_RADIOTAP_FHSS = 4, 00185 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5, 00186 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6, 00187 IEEE80211_RADIOTAP_LOCK_QUALITY = 7, 00188 IEEE80211_RADIOTAP_TX_ATTENUATION = 8, 00189 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, 00190 IEEE80211_RADIOTAP_DBM_TX_POWER = 10, 00191 IEEE80211_RADIOTAP_ANTENNA = 11, 00192 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12, 00193 IEEE80211_RADIOTAP_DB_ANTNOISE = 13, 00194 IEEE80211_RADIOTAP_RX_FLAGS = 14, 00195 IEEE80211_RADIOTAP_TX_FLAGS = 15, 00196 IEEE80211_RADIOTAP_RTS_RETRIES = 16, 00197 IEEE80211_RADIOTAP_DATA_RETRIES = 17, 00198 IEEE80211_RADIOTAP_EXT = 31 00199 }; 00200 00201 #if !defined(__KERNEL__) && !defined(_KERNEL) 00202 /* Channel flags. */ 00203 #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */ 00204 #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */ 00205 #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */ 00206 #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */ 00207 #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */ 00208 #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */ 00209 #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */ 00210 #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */ 00211 #endif /* !defined(__KERNEL__) && !defined(_KERNEL) */ 00212 00213 /* For IEEE80211_RADIOTAP_FLAGS */ 00214 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received 00215 * during CFP 00216 */ 00217 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received 00218 * with short 00219 * preamble 00220 */ 00221 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received 00222 * with WEP encryption 00223 */ 00224 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received 00225 * with fragmentation 00226 */ 00227 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */ 00228 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between 00229 * 802.11 header and payload 00230 * (to 32-bit boundary) 00231 */ 00232 /* For IEEE80211_RADIOTAP_RX_FLAGS */ 00233 #define IEEE80211_RADIOTAP_F_RX_BADFCS 0x0001 /* frame failed crc check */ 00234 00235 /* For IEEE80211_RADIOTAP_TX_FLAGS */ 00236 #define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive 00237 * retries */ 00238 00239 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */
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