49e1839354
and all the structures that include it. this should not change anything while avoiding packed vs alignment warnings from GCC 8, and potentially pessimised code generation due to the packed marker (there are no misaligned members, just that the per-device parts may end unaligned.) all consumers of these members are done from the properly aligned packet members directly, or, as a union with a 64 byte member, also properly aligned. codegen didn't appear to change, except for the definition of sizeof(struct driver_[rt]x_radiotap_header) in debug info, which is not directly used anywhere.
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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