Experimental bpf capture format for 802.11 devices. The link layer
type belongs in net/bpf.h but we keep it here for the moment. P: Submittep by: Obtained from: David Young <dyoung@pobox.com>
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Sam Leffler
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917cf8d2a3
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185
sys/net80211/ieee80211_radiotap.h
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sys/net80211/ieee80211_radiotap.h
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/* $FreeBSD$ */
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/* $NetBSD: $ */
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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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* 3. The name of David Young may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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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 _NET_IF_IEEE80211RADIOTAP_H_
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#define _NET_IF_IEEE80211RADIOTAP_H_
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/* A generic radio capture format is desirable. There is one for
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* Linux, but it is neither rigidly defined (there were not even
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* units given for some fields) nor easily extensible.
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*
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* I suggest the following 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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#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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/* The radio capture header precedes the 802.11 header. */
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struct ieee80211_radiotap_header {
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u_int8_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 LTVs does not count.
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*/
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u_int8_t it_pad;
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u_int16_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 LTVs.
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*/
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u_int32_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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};
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/* Name Data type Units
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* ---- --------- -----
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*
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* IEEE80211_RADIOTAP_CHANNEL u_int8_t MHz
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*
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* Tx/Rx channel number (for DSSS/OFDM/PBCC PHY)
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*
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* IEEE80211_RADIOTAP_FHSS u_int16_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 u_int8_t .5Mb/s
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*
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* IEEE Tx/Rx data rate cookie (including basic rate flag)
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*
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* IEEE80211_RADIOTAP_DB_ANTSIGNAL int16_t decibel (dB)
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*
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* RF signal power at the antenna, measured from a fixed,
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* arbitrary reference point.
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*
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* IEEE80211_RADIOTAP_DB_ANTNOISE int16_t decibel (dB)
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*
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* RF noise power at the antenna in decibels from an arbitrary,
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* fixed reference point.
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*
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* IEEE80211_RADIOTAP_BARKER_CODE_LOCK u_int16_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 u_int16_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 u_int16_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 u_int16_t decibels from
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* 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_TSFT u_int64_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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* Little-endian byte order.
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*
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* IEEE80211_RADIOTAP_FLAGS u_int16_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_TIME u_int32_t microseconds
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*
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* For radios that provide it: packet arrival time in
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* microseconds. Prism hardware will provide this, but it is
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* not known whether it marks the first or the last bit of
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* the frame. Nor is it known where that bit has arrived
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* (antenna, modem, MAC?) when the time is measured.
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*
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* IEEE80211_RADIOTAP_ANTENNA u_int16_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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enum ieee80211_radiotap_type {
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IEEE80211_RADIOTAP_PAD = 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_DB_ANTSIGNAL = 5,
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IEEE80211_RADIOTAP_DB_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_TSFT = 12,
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IEEE80211_RADIOTAP_EXT = 31,
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IEEE80211_RADIOTAP_TIME = 32
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};
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/* For IEEE80211_RADIOTAP_FLAGS */
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#define IEEE80211_RADIOTAP_F_CFP 0x0001 /* sent/received
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* during CFP
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*/
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#define IEEE80211_RADIOTAP_F_SHORTPRE 0x0002 /* 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 0x0004 /* sent/received
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* with WEP encryption
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*/
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#define IEEE80211_RADIOTAP_F_FRAG 0x0008 /* sent/received
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* with fragmentation
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*/
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#endif /* _NET_IF_IEEE80211RADIOTAP_H_ */
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