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ieee802_11_radio.h
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ieee802_11_radio.h
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/* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5 2005/01/22 20:12:05 sam Exp $ */
/* NetBSD: ieee802_11_radio.h,v 1.2 2006/02/26 03:04:03 dyoung Exp */
/* $Header: /tcpdump/master/tcpdump/ieee802_11_radio.h,v 1.3 2007-08-29 02:31:44 mcr Exp $ */
/*-
* Copyright (c) 2003, 2004 David Young. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of David Young may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
* YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#ifndef _NET_IF_IEEE80211RADIOTAP_H_
#define _NET_IF_IEEE80211RADIOTAP_H_
/* A generic radio capture format is desirable. It must be
* rigidly defined (e.g., units for fields should be given),
* and easily extensible.
*
* The following is an extensible radio capture format. It is
* based on a bitmap indicating which fields are present.
*
* I am trying to describe precisely what the application programmer
* should expect in the following, and for that reason I tell the
* units and origin of each measurement (where it applies), or else I
* use sufficiently weaselly language ("is a monotonically nondecreasing
* function of...") that I cannot set false expectations for lawyerly
* readers.
*/
/*
* The radio capture header precedes the 802.11 header.
*
* Note well: all radiotap fields are little-endian.
*/
struct ieee80211_radiotap_header {
u_int8_t it_version; /* Version 0. Only increases
* for drastic changes,
* introduction of compatible
* new fields does not count.
*/
u_int8_t it_pad;
u_int16_t it_len; /* length of the whole
* header in bytes, including
* it_version, it_pad,
* it_len, and data fields.
*/
u_int32_t it_present; /* A bitmap telling which
* fields are present. Set bit 31
* (0x80000000) to extend the
* bitmap by another 32 bits.
* Additional extensions are made
* by setting bit 31.
*/
};
/* Name Data type Units
* ---- --------- -----
*
* IEEE80211_RADIOTAP_TSFT u_int64_t microseconds
*
* Value in microseconds of the MAC's 64-bit 802.11 Time
* Synchronization Function timer when the first bit of the
* MPDU arrived at the MAC. For received frames, only.
*
* IEEE80211_RADIOTAP_CHANNEL 2 x u_int16_t MHz, bitmap
*
* Tx/Rx frequency in MHz, followed by flags (see below).
* Note that IEEE80211_RADIOTAP_XCHANNEL must be used to
* represent an HT channel as there is not enough room in
* the flags word.
*
* IEEE80211_RADIOTAP_FHSS u_int16_t see below
*
* For frequency-hopping radios, the hop set (first byte)
* and pattern (second byte).
*
* IEEE80211_RADIOTAP_RATE u_int8_t 500kb/s or index
*
* Tx/Rx data rate. If bit 0x80 is set then it represents an
* an MCS index and not an IEEE rate.
*
* IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from
* one milliwatt (dBm)
*
* RF signal power at the antenna, decibel difference from
* one milliwatt.
*
* IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from
* one milliwatt (dBm)
*
* RF noise power at the antenna, decibel difference from one
* milliwatt.
*
* IEEE80211_RADIOTAP_DB_ANTSIGNAL u_int8_t decibel (dB)
*
* RF signal power at the antenna, decibel difference from an
* arbitrary, fixed reference.
*
* IEEE80211_RADIOTAP_DB_ANTNOISE u_int8_t decibel (dB)
*
* RF noise power at the antenna, decibel difference from an
* arbitrary, fixed reference point.
*
* IEEE80211_RADIOTAP_LOCK_QUALITY u_int16_t unitless
*
* Quality of Barker code lock. Unitless. Monotonically
* nondecreasing with "better" lock strength. Called "Signal
* Quality" in datasheets. (Is there a standard way to measure
* this?)
*
* IEEE80211_RADIOTAP_TX_ATTENUATION u_int16_t unitless
*
* Transmit power expressed as unitless distance from max
* power set at factory calibration. 0 is max power.
* Monotonically nondecreasing with lower power levels.
*
* IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t decibels (dB)
*
* Transmit power expressed as decibel distance from max power
* set at factory calibration. 0 is max power. Monotonically
* nondecreasing with lower power levels.
*
* IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from
* one milliwatt (dBm)
*
* Transmit power expressed as dBm (decibels from a 1 milliwatt
* reference). This is the absolute power level measured at
* the antenna port.
*
* IEEE80211_RADIOTAP_FLAGS u_int8_t bitmap
*
* Properties of transmitted and received frames. See flags
* defined below.
*
* IEEE80211_RADIOTAP_ANTENNA u_int8_t antenna index
*
* Unitless indication of the Rx/Tx antenna for this packet.
* The first antenna is antenna 0.
*
* IEEE80211_RADIOTAP_RX_FLAGS u_int16_t bitmap
*
* Properties of received frames. See flags defined below.
*
* IEEE80211_RADIOTAP_XCHANNEL u_int32_t bitmap
* u_int16_t MHz
* u_int8_t channel number
* u_int8_t .5 dBm
*
* Extended channel specification: flags (see below) followed by
* frequency in MHz, the corresponding IEEE channel number, and
* finally the maximum regulatory transmit power cap in .5 dBm
* units. This property supersedes IEEE80211_RADIOTAP_CHANNEL
* and only one of the two should be present.
*
* IEEE80211_RADIOTAP_MCS u_int8_t known
* u_int8_t flags
* u_int8_t mcs
*
* Bitset indicating which fields have known values, followed
* by bitset of flag values, followed by the MCS rate index as
* in IEEE 802.11n.
*
* IEEE80211_RADIOTAP_VENDOR_NAMESPACE
* u_int8_t OUI[3]
* u_int8_t subspace
* u_int16_t length
*
* The Vendor Namespace Field contains three sub-fields. The first
* sub-field is 3 bytes long. It contains the vendor's IEEE 802
* Organizationally Unique Identifier (OUI). The fourth byte is a
* vendor-specific "namespace selector."
*
*/
enum ieee80211_radiotap_type {
IEEE80211_RADIOTAP_TSFT = 0,
IEEE80211_RADIOTAP_FLAGS = 1,
IEEE80211_RADIOTAP_RATE = 2,
IEEE80211_RADIOTAP_CHANNEL = 3,
IEEE80211_RADIOTAP_FHSS = 4,
IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
IEEE80211_RADIOTAP_ANTENNA = 11,
IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
IEEE80211_RADIOTAP_RX_FLAGS = 14,
/* NB: gap for netbsd definitions */
IEEE80211_RADIOTAP_XCHANNEL = 18,
IEEE80211_RADIOTAP_MCS = 19,
IEEE80211_RADIOTAP_NAMESPACE = 29,
IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30,
IEEE80211_RADIOTAP_EXT = 31
};
/* channel attributes */
#define IEEE80211_CHAN_TURBO 0x00010 /* Turbo channel */
#define IEEE80211_CHAN_CCK 0x00020 /* CCK channel */
#define IEEE80211_CHAN_OFDM 0x00040 /* OFDM channel */
#define IEEE80211_CHAN_2GHZ 0x00080 /* 2 GHz spectrum channel. */
#define IEEE80211_CHAN_5GHZ 0x00100 /* 5 GHz spectrum channel */
#define IEEE80211_CHAN_PASSIVE 0x00200 /* Only passive scan allowed */
#define IEEE80211_CHAN_DYN 0x00400 /* Dynamic CCK-OFDM channel */
#define IEEE80211_CHAN_GFSK 0x00800 /* GFSK channel (FHSS PHY) */
#define IEEE80211_CHAN_GSM 0x01000 /* 900 MHz spectrum channel */
#define IEEE80211_CHAN_STURBO 0x02000 /* 11a static turbo channel only */
#define IEEE80211_CHAN_HALF 0x04000 /* Half rate channel */
#define IEEE80211_CHAN_QUARTER 0x08000 /* Quarter rate channel */
#define IEEE80211_CHAN_HT20 0x10000 /* HT 20 channel */
#define IEEE80211_CHAN_HT40U 0x20000 /* HT 40 channel w/ ext above */
#define IEEE80211_CHAN_HT40D 0x40000 /* HT 40 channel w/ ext below */
/* Useful combinations of channel characteristics, borrowed from Ethereal */
#define IEEE80211_CHAN_A \
(IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM)
#define IEEE80211_CHAN_B \
(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_CCK)
#define IEEE80211_CHAN_G \
(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_DYN)
#define IEEE80211_CHAN_TA \
(IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_OFDM | IEEE80211_CHAN_TURBO)
#define IEEE80211_CHAN_TG \
(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_DYN | IEEE80211_CHAN_TURBO)
/* For IEEE80211_RADIOTAP_FLAGS */
#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
* during CFP
*/
#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
* with short
* preamble
*/
#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
* with WEP encryption
*/
#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
* with fragmentation
*/
#define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
#define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
* 802.11 header and payload
* (to 32-bit boundary)
*/
#define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */
/* For IEEE80211_RADIOTAP_RX_FLAGS */
#define IEEE80211_RADIOTAP_F_RX_BADFCS 0x0001 /* frame failed crc check */
#define IEEE80211_RADIOTAP_F_RX_PLCP_CRC 0x0002 /* frame failed PLCP CRC check */
/* For IEEE80211_RADIOTAP_MCS known */
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_KNOWN 0x01
#define IEEE80211_RADIOTAP_MCS_MCS_INDEX_KNOWN 0x02 /* MCS index field */
#define IEEE80211_RADIOTAP_MCS_GUARD_INTERVAL_KNOWN 0x04
#define IEEE80211_RADIOTAP_MCS_HT_FORMAT_KNOWN 0x08
#define IEEE80211_RADIOTAP_MCS_FEC_TYPE_KNOWN 0x10
#define IEEE80211_RADIOTAP_MCS_STBC_KNOWN 0x20
/* For IEEE80211_RADIOTAP_MCS flags */
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_MASK 0x03
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_20 0
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_40 1
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_20L 2
#define IEEE80211_RADIOTAP_MCS_BANDWIDTH_20U 3
#define IEEE80211_RADIOTAP_MCS_SHORT_GI 0x04 /* short guard interval */
#define IEEE80211_RADIOTAP_MCS_HT_GREENFIELD 0x08
#define IEEE80211_RADIOTAP_MCS_FEC_LDPC 0x10
#define IEEE80211_RADIOTAP_MCS_STBC_MASK 0x60
#define IEEE80211_RADIOTAP_MCS_STBC_1 1
#define IEEE80211_RADIOTAP_MCS_STBC_2 2
#define IEEE80211_RADIOTAP_MCS_STBC_3 3
#define IEEE80211_RADIOTAP_MCS_STBC_SHIFT 5
#endif /* _NET_IF_IEEE80211RADIOTAP_H_ */