253 lines
9.4 KiB
C
253 lines
9.4 KiB
C
/* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.11 2007/12/13 01:23:40 sam Exp $ */
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/* $NetBSD: ieee80211_radiotap.h,v 1.25 2019/10/05 23:27:20 mrg Exp $ */
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/*-
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* Copyright (c) 2003, 2004 David Young. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
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* YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*/
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#ifndef _NET80211_IEEE80211_RADIOTAP_H_
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#define _NET80211_IEEE80211_RADIOTAP_H_
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/* A generic radio capture format is desirable. It must be
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* rigidly defined (e.g., units for fields should be given),
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* and easily extensible.
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*
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* The following is an extensible radio capture format. It is
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* based on a bitmap indicating which fields are present.
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*
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* I am trying to describe precisely what the application programmer
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* should expect in the following, and for that reason I tell the
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* units and origin of each measurement (where it applies), or else I
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* use sufficiently weaselly language ("is a monotonically nondecreasing
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* function of...") that I cannot set false expectations for lawyerly
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* readers.
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*/
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#if defined(__KERNEL__) || defined(_KERNEL)
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#ifndef DLT_IEEE802_11_RADIO
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#define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */
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#endif
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#endif /* defined(__KERNEL__) || defined(_KERNEL) */
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/* XXX tcpdump/libpcap do not tolerate variable-length headers,
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* yet, so we pad every radiotap header to 64 bytes. Ugh.
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*/
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#define IEEE80211_RADIOTAP_HDRLEN 64
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/*
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* The radio capture header precedes the 802.11 header.
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*
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* Note well: all radiotap fields are little-endian.
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*/
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struct ieee80211_radiotap_header {
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uint8_t it_version; /* Version 0. Only increases
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* for drastic changes,
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* introduction of compatible
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* new fields does not count.
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*/
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uint8_t it_pad;
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uint16_t it_len; /* length of the whole
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* header in bytes, including
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* it_version, it_pad,
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* it_len, and data fields.
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*/
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uint32_t it_present; /* A bitmap telling which
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* fields are present. Set bit 31
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* (0x80000000) to extend the
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* bitmap by another 32 bits.
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* Additional extensions are made
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* by setting bit 31.
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*/
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} __aligned(8);
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/*
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* Name Data type Units
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* ---- --------- -----
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*
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* IEEE80211_RADIOTAP_TSFT uint64_t microseconds
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*
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* Value in microseconds of the MAC's 64-bit 802.11 Time
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* Synchronization Function timer when the first bit of the
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* MPDU arrived at the MAC. For received frames, only.
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*
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* IEEE80211_RADIOTAP_CHANNEL 2 x uint16_t MHz, bitmap
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*
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* Tx/Rx frequency in MHz, followed by flags (see below).
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*
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* IEEE80211_RADIOTAP_FHSS uint16_t see below
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*
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* For frequency-hopping radios, the hop set (first byte)
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* and pattern (second byte).
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*
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* IEEE80211_RADIOTAP_RATE uint8_t 500kb/s
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*
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* Tx/Rx data rate
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*
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* IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from
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* one milliwatt (dBm)
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*
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* RF signal power at the antenna, decibel difference from
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* one milliwatt.
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*
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* IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from
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* one milliwatt (dBm)
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*
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* RF noise power at the antenna, decibel difference from one
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* milliwatt.
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*
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* IEEE80211_RADIOTAP_DB_ANTSIGNAL uint8_t decibel (dB)
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*
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* RF signal power at the antenna, decibel difference from an
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* arbitrary, fixed reference.
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*
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* IEEE80211_RADIOTAP_DB_ANTNOISE uint8_t decibel (dB)
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*
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* RF noise power at the antenna, decibel difference from an
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* arbitrary, fixed reference point.
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*
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* IEEE80211_RADIOTAP_LOCK_QUALITY uint16_t unitless
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*
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* Quality of Barker code lock. Unitless. Monotonically
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* nondecreasing with "better" lock strength. Called "Signal
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* Quality" in datasheets. (Is there a standard way to measure
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* this?)
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*
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* IEEE80211_RADIOTAP_TX_ATTENUATION uint16_t unitless
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*
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* Transmit power expressed as unitless distance from max
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* power set at factory calibration. 0 is max power.
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* Monotonically nondecreasing with lower power levels.
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*
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* IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t decibels (dB)
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*
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* Transmit power expressed as decibel distance from max power
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* set at factory calibration. 0 is max power. Monotonically
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* nondecreasing with lower power levels.
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*
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* IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from
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* one milliwatt (dBm)
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*
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* Transmit power expressed as dBm (decibels from a 1 milliwatt
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* reference). This is the absolute power level measured at
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* the antenna port.
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*
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* IEEE80211_RADIOTAP_FLAGS uint8_t bitmap
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*
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* Properties of transmitted and received frames. See flags
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* defined below.
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*
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* IEEE80211_RADIOTAP_ANTENNA uint8_t antenna index
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*
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* Unitless indication of the Rx/Tx antenna for this packet.
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* The first antenna is antenna 0.
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*
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* IEEE80211_RADIOTAP_RX_FLAGS uint16_t bitmap
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*
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* Properties of received frames. See flags defined below.
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*
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* IEEE80211_RADIOTAP_TX_FLAGS uint16_t bitmap
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*
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* Properties of transmitted frames. See flags defined below.
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*
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* IEEE80211_RADIOTAP_RTS_RETRIES uint8_t data
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*
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* Number of rts retries a transmitted frame used.
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*
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* IEEE80211_RADIOTAP_DATA_RETRIES uint8_t data
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*
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* Number of unicast retries a transmitted frame used.
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*
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* IEEE80211_RADIOTAP_XCHANNEL uint32_t bitmap
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* uint16_t MHz
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* uint8_t channel number
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* int8_t .5 dBm
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*
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* Extended channel specification: flags (see below) followed by
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* frequency in MHz, the corresponding IEEE channel number, and
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* finally the maximum regulatory transmit power cap in .5 dBm
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* units. This property supersedes IEEE80211_RADIOTAP_CHANNEL
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* and only one of the two should be present.
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*/
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enum ieee80211_radiotap_type {
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IEEE80211_RADIOTAP_TSFT = 0,
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IEEE80211_RADIOTAP_FLAGS = 1,
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IEEE80211_RADIOTAP_RATE = 2,
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IEEE80211_RADIOTAP_CHANNEL = 3,
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IEEE80211_RADIOTAP_FHSS = 4,
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IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
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IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
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IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
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IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
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IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
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IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
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IEEE80211_RADIOTAP_ANTENNA = 11,
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IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
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IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
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IEEE80211_RADIOTAP_RX_FLAGS = 14,
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IEEE80211_RADIOTAP_TX_FLAGS = 15,
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IEEE80211_RADIOTAP_RTS_RETRIES = 16,
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IEEE80211_RADIOTAP_DATA_RETRIES = 17,
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IEEE80211_RADIOTAP_XCHANNEL = 18,
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IEEE80211_RADIOTAP_EXT = 31
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};
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/* For IEEE80211_RADIOTAP_FLAGS */
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#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
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* during CFP
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*/
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#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
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* with short
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* preamble
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*/
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#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
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* with WEP encryption
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*/
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#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
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* with fragmentation
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*/
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#define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
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#define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
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* 802.11 header and payload
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* (to 32-bit boundary)
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*/
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#define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */
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#define IEEE80211_RADIOTAP_F_SHORTGI 0x80 /* HT short GI */
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/* For IEEE80211_RADIOTAP_RX_FLAGS */
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#define IEEE80211_RADIOTAP_F_RX_BADFCS 0x0001 /* Frame failed CRC check.
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*
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* Deprecated: use the flag
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* IEEE80211_RADIOTAP_F_BADFCS in
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* the IEEE80211_RADIOTAP_FLAGS
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* field, instead.
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*/
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/* For IEEE80211_RADIOTAP_TX_FLAGS */
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#define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive
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* retries
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*/
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#define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */
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#define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */
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#endif /* !_NET80211_IEEE80211_RADIOTAP_H_ */
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