Annotation of sys/net80211/ieee80211_radiotap.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: ieee80211_radiotap.h,v 1.8 2006/06/23 21:34:15 reyk Exp $ */
! 2: /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.3 2004/04/05 22:13:21 sam Exp $ */
! 3: /* $NetBSD: ieee80211_radiotap.h,v 1.9 2004/06/06 04:13:28 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:
! 51: /* XXX tcpdump/libpcap do not tolerate variable-length headers,
! 52: * yet, so we pad every radiotap header to 64 bytes. Ugh.
! 53: */
! 54: #define IEEE80211_RADIOTAP_HDRLEN 64
! 55:
! 56: /* The radio capture header precedes the 802.11 header. */
! 57: struct 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: } __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: *
! 158: * IEEE80211_RADIOTAP_FCS u_int32_t data
! 159: *
! 160: * FCS from frame in network byte order.
! 161: *
! 162: * IEEE80211_RADIOTAP_HWQUEUE u_int8_t data
! 163: *
! 164: * A specific hardware queue (used by WME)
! 165: *
! 166: * IEEE80211_RADIOTAP_RSSI 2x u_int8_t RSSI, max RSSI
! 167: *
! 168: * A relative Received Signal Strength Index
! 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_FCS = 14,
! 186: IEEE80211_RADIOTAP_HWQUEUE = 15,
! 187: IEEE80211_RADIOTAP_RSSI = 16,
! 188: IEEE80211_RADIOTAP_EXT = 31
! 189: };
! 190:
! 191: /* For IEEE80211_RADIOTAP_FLAGS */
! 192: #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
! 193: * during CFP
! 194: */
! 195: #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
! 196: * with short
! 197: * preamble
! 198: */
! 199: #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
! 200: * with WEP encryption
! 201: */
! 202: #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
! 203: * with fragmentation
! 204: */
! 205:
! 206: #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */
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