ieee80211_radiotap.h

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    1 /* $OpenBSD: ieee80211_radiotap.h,v 1.17 2022/03/14 15:06:04 stsp 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  *
   17  * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
   18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   19  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   20  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL DAVID
   21  * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   23  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   28  * OF SUCH DAMAGE.
   29  */
   30 #ifndef _NET_IF_IEEE80211RADIOTAP_H_
   31 #define _NET_IF_IEEE80211RADIOTAP_H_
   32 
   33 /* A generic radio capture format is desirable. There is one for
   34  * Linux, but it is neither rigidly defined (there were not even
   35  * units given for some fields) nor easily extensible.
   36  *
   37  * I suggest the following extensible radio capture format. It is
   38  * based on a bitmap indicating which fields are present.
   39  *
   40  * I am trying to describe precisely what the application programmer
   41  * should expect in the following, and for that reason I tell the
   42  * units and origin of each measurement (where it applies), or else I
   43  * use sufficiently weaselly language ("is a monotonically nondecreasing
   44  * function of...") that I cannot set false expectations for lawyerly
   45  * readers.
   46  */
   47 
   48 /* XXX tcpdump/libpcap do not tolerate variable-length headers,
   49  * yet, so we pad every radiotap header to 64 bytes. Ugh.
   50  */
   51 #define IEEE80211_RADIOTAP_HDRLEN       64
   52 
   53 /* The radio capture header precedes the 802.11 header. */
   54 struct ieee80211_radiotap_header {
   55         u_int8_t        it_version;     /* Version 0. Only increases
   56                                          * for drastic changes,
   57                                          * introduction of compatible
   58                                          * new fields does not count.
   59                                          */
   60         u_int8_t        it_pad;
   61         u_int16_t       it_len;         /* length of the whole
   62                                          * header in bytes, including
   63                                          * it_version, it_pad,
   64                                          * it_len, and data fields.
   65                                          */
   66         u_int32_t       it_present;     /* A bitmap telling which
   67                                          * fields are present. Set bit 31
   68                                          * (0x80000000) to extend the
   69                                          * bitmap by another 32 bits.
   70                                          * Additional extensions are made
   71                                          * by setting bit 31.
   72                                          */
   73 } __packed;
   74 
   75 /* Name                                 Data type       Units
   76  * ----                                 ---------       -----
   77  *
   78  * IEEE80211_RADIOTAP_TSFT              u_int64_t       microseconds
   79  *
   80  *      Value in microseconds of the MAC's 64-bit 802.11 Time
   81  *      Synchronization Function timer when the first bit of the
   82  *      MPDU arrived at the MAC. For received frames, only.
   83  *
   84  * IEEE80211_RADIOTAP_CHANNEL           2 x u_int16_t   MHz, bitmap
   85  *
   86  *      Tx/Rx frequency in MHz, followed by flags (see below).
   87  *
   88  * IEEE80211_RADIOTAP_FHSS              u_int16_t       see below
   89  *
   90  *      For frequency-hopping radios, the hop set (first byte)
   91  *      and pattern (second byte).
   92  *
   93  * IEEE80211_RADIOTAP_RATE              u_int8_t        500kb/s or MCS index
   94  *
   95  *      Tx/Rx data rate in units of 500kb/s. If the high bit (0x80) is set
   96  *      the remaining bits contain an MCS index instead of a date rate.
   97  *
   98  * IEEE80211_RADIOTAP_DBM_ANTSIGNAL     int8_t          decibels from
   99  *                                                      one milliwatt (dBm)
  100  *
  101  *      RF signal power at the antenna, decibel difference from
  102  *      one milliwatt.
  103  *
  104  * IEEE80211_RADIOTAP_DBM_ANTNOISE      int8_t          decibels from
  105  *                                                      one milliwatt (dBm)
  106  *
  107  *      RF noise power at the antenna, decibel difference from one
  108  *      milliwatt.
  109  *
  110  * IEEE80211_RADIOTAP_DB_ANTSIGNAL      u_int8_t        decibel (dB)
  111  *
  112  *      RF signal power at the antenna, decibel difference from an
  113  *      arbitrary, fixed reference.
  114  *
  115  * IEEE80211_RADIOTAP_DB_ANTNOISE       u_int8_t        decibel (dB)
  116  *
  117  *      RF noise power at the antenna, decibel difference from an
  118  *      arbitrary, fixed reference point.
  119  *
  120  * IEEE80211_RADIOTAP_BARKER_CODE_LOCK  u_int16_t       unitless
  121  *
  122  *      Quality of Barker code lock. Unitless. Monotonically
  123  *      nondecreasing with "better" lock strength. Called "Signal
  124  *      Quality" in datasheets.  (Is there a standard way to measure
  125  *      this?)
  126  *
  127  * IEEE80211_RADIOTAP_TX_ATTENUATION    u_int16_t       unitless
  128  *
  129  *      Transmit power expressed as unitless distance from max
  130  *      power set at factory calibration.  0 is max power.
  131  *      Monotonically nondecreasing with lower power levels.
  132  *
  133  * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t       decibels (dB)
  134  *
  135  *      Transmit power expressed as decibel distance from max power
  136  *      set at factory calibration.  0 is max power.  Monotonically
  137  *      nondecreasing with lower power levels.
  138  *
  139  * IEEE80211_RADIOTAP_DBM_TX_POWER      int8_t          decibels from
  140  *                                                      one milliwatt (dBm)
  141  *
  142  *      Transmit power expressed as dBm (decibels from a 1 milliwatt
  143  *      reference). This is the absolute power level measured at
  144  *      the antenna port.
  145  *
  146  * IEEE80211_RADIOTAP_FLAGS             u_int8_t        bitmap
  147  *
  148  *      Properties of transmitted and received frames. See flags
  149  *      defined below.
  150  *
  151  * IEEE80211_RADIOTAP_ANTENNA           u_int8_t        antenna index
  152  *
  153  *      Unitless indication of the Rx/Tx antenna for this packet.
  154  *      The first antenna is antenna 0.
  155  *
  156  * IEEE80211_RADIOTAP_FCS               u_int32_t       data
  157  *
  158  *      FCS from frame in network byte order.
  159  *
  160  * IEEE80211_RADIOTAP_RSSI              2x u_int8_t    RSSI, max RSSI
  161  *
  162  *      A relative Received Signal Strength Index
  163  */
  164 enum ieee80211_radiotap_type {
  165         IEEE80211_RADIOTAP_TSFT = 0,
  166         IEEE80211_RADIOTAP_FLAGS = 1,
  167         IEEE80211_RADIOTAP_RATE = 2,
  168         IEEE80211_RADIOTAP_CHANNEL = 3,
  169         IEEE80211_RADIOTAP_FHSS = 4,
  170         IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
  171         IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
  172         IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
  173         IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
  174         IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
  175         IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
  176         IEEE80211_RADIOTAP_ANTENNA = 11,
  177         IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
  178         IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
  179         IEEE80211_RADIOTAP_FCS = 14,
  180         IEEE80211_RADIOTAP_RSSI = 16,
  181         IEEE80211_RADIOTAP_EXT = 31
  182 };
  183 
  184 #ifndef _KERNEL
  185 /* For IEEE80211_RADIOTAP_CHANNEL */
  186 #define IEEE80211_CHAN_CCK      0x0020  /* CCK channel */
  187 #define IEEE80211_CHAN_OFDM     0x0040  /* OFDM channel */
  188 #define IEEE80211_CHAN_2GHZ     0x0080  /* 2 GHz spectrum channel */
  189 #define IEEE80211_CHAN_5GHZ     0x0100  /* 5 GHz spectrum channel */
  190 #define IEEE80211_CHAN_PASSIVE  0x0200  /* Only passive scan allowed */
  191 #define IEEE80211_CHAN_DYN      0x0400  /* Dynamic CCK-OFDM channel */
  192 #define IEEE80211_CHAN_GFSK     0x0800  /* GFSK channel (FHSS PHY) */
  193 #define IEEE80211_CHAN_XR       0x1000  /* Extended range OFDM channel */
  194 #define IEEE80211_CHAN_HT       0x2000  /* 11n/HT channel */
  195 #define IEEE80211_CHAN_VHT      0x4000  /* 11ac/VHT channel */
  196 #define IEEE80211_CHAN_40MHZ    0x8000  /* use of 40 MHz is allowed */
  197 #endif  /* !_KERNEL */
  198 
  199 /* For IEEE80211_RADIOTAP_FLAGS */
  200 #define IEEE80211_RADIOTAP_F_CFP        0x01    /* sent/received
  201                                                  * during CFP
  202                                                  */
  203 #define IEEE80211_RADIOTAP_F_SHORTPRE   0x02    /* sent/received
  204                                                  * with short
  205                                                  * preamble
  206                                                  */
  207 #define IEEE80211_RADIOTAP_F_WEP        0x04    /* sent/received
  208                                                  * with WEP encryption
  209                                                  */
  210 #define IEEE80211_RADIOTAP_F_FRAG       0x08    /* sent/received
  211                                                  * with fragmentation
  212                                                  */
  213 #define IEEE80211_RADIOTAP_F_FCS        0x10    /* frame includes FCS */
  214 
  215 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/net80211/ieee80211_radiotap.h

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sys/net80211/ieee80211_radiotap.h