The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_radiotap.h

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    1 /* $FreeBSD: releng/5.2/sys/net80211/ieee80211_radiotap.h 119782 2003-09-05 22:19:32Z sam $ */
    2 /*      $NetBSD: $      */
    3 
    4 /*-
    5  * Copyright (c) 2003, 2004 David Young.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. The name of David Young may not be used to endorse or promote
   16  *    products derived from this software without specific prior
   17  *    written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
   20  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   22  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL DAVID
   23  * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   25  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   30  * OF SUCH DAMAGE.
   31  */
   32 #ifndef _NET_IF_IEEE80211RADIOTAP_H_
   33 #define _NET_IF_IEEE80211RADIOTAP_H_
   34 
   35 /* A generic radio capture format is desirable. There is one for
   36  * Linux, but it is neither rigidly defined (there were not even
   37  * units given for some fields) nor easily extensible.
   38  *
   39  * I suggest the following extensible radio capture format. It is
   40  * based on a bitmap indicating which fields are present.
   41  *
   42  * I am trying to describe precisely what the application programmer
   43  * should expect in the following, and for that reason I tell the
   44  * units and origin of each measurement (where it applies), or else I
   45  * use sufficiently weaselly language ("is a monotonically nondecreasing
   46  * function of...") that I cannot set false expectations for lawyerly
   47  * readers.
   48  */
   49 #ifndef DLT_IEEE802_11_RADIO
   50 #define DLT_IEEE802_11_RADIO    127     /* 802.11 plus WLAN header */
   51 #endif
   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 LTVs 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 LTVs.
   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 };
   74 
   75 /* Name                                 Data type       Units
   76  * ----                                 ---------       -----
   77  *
   78  * IEEE80211_RADIOTAP_CHANNEL           u_int8_t        MHz
   79  *
   80  *      Tx/Rx channel number (for DSSS/OFDM/PBCC PHY)
   81  *
   82  * IEEE80211_RADIOTAP_FHSS              u_int16_t       see below
   83  *
   84  *      For frequency-hopping radios, the hop set (first byte)
   85  *      and pattern (second byte).
   86  *
   87  * IEEE80211_RADIOTAP_RATE              u_int8_t        .5Mb/s
   88  *
   89  *      IEEE Tx/Rx data rate cookie (including basic rate flag)
   90  *
   91  * IEEE80211_RADIOTAP_DB_ANTSIGNAL      int16_t         decibel (dB)
   92  *              
   93  *      RF signal power at the antenna, measured from a fixed,
   94  *      arbitrary reference point.
   95  *
   96  * IEEE80211_RADIOTAP_DB_ANTNOISE       int16_t         decibel (dB)
   97  *
   98  *      RF noise power at the antenna in decibels from an arbitrary,
   99  *      fixed reference point.
  100  *
  101  * IEEE80211_RADIOTAP_BARKER_CODE_LOCK  u_int16_t       unitless
  102  *
  103  *      Quality of Barker code lock. Unitless. Monotonically
  104  *      nondecreasing with "better" lock strength. Called "Signal
  105  *      Quality" in datasheets.  (Is there a standard way to measure
  106  *      this?)
  107  *
  108  * IEEE80211_RADIOTAP_TX_ATTENUATION    u_int16_t       unitless
  109  *
  110  *      Transmit power expressed as unitless distance from max
  111  *      power set at factory calibration.  0 is max power.
  112  *      Monotonically nondecreasing with lower power levels.
  113  *
  114  * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t       decibels (dB)
  115  *
  116  *      Transmit power expressed as decibel distance from max power
  117  *      set at factory calibration.  0 is max power.  Monotonically
  118  *      nondecreasing with lower power levels.
  119  *
  120  * IEEE80211_RADIOTAP_DBM_TX_POWER      u_int16_t       decibels from
  121  *                                                      milliwatt (dBm)
  122  *
  123  *      Transmit power expressed as dBm (decibels from a 1 milliwatt
  124  *      reference). This is the absolute power level measured at
  125  *      the antenna port.
  126  *
  127  * IEEE80211_RADIOTAP_TSFT              u_int64_t       microseconds
  128  *
  129  *      Value in microseconds of the MAC's 64-bit 802.11 Time
  130  *      Synchronization Function timer when the first bit of the
  131  *      MPDU arrived at the MAC. For received frames, only.
  132  *      Little-endian byte order.
  133  *
  134  * IEEE80211_RADIOTAP_FLAGS             u_int16_t       bitmap
  135  *
  136  *      Properties of transmitted and received frames. See flags
  137  *      defined below.
  138  *
  139  * IEEE80211_RADIOTAP_TIME              u_int32_t       microseconds
  140  *
  141  *      For radios that provide it: packet arrival time in
  142  *      microseconds. Prism hardware will provide this, but it is
  143  *      not known whether it marks the first or the last bit of
  144  *      the frame. Nor is it known where that bit has arrived
  145  *      (antenna, modem, MAC?) when the time is measured.
  146  *
  147  * IEEE80211_RADIOTAP_ANTENNA           u_int16_t       antenna index
  148  *
  149  *      Unitless indication of the Rx/Tx antenna for this packet.
  150  *      The first antenna is antenna 0.
  151  */
  152 enum ieee80211_radiotap_type {
  153         IEEE80211_RADIOTAP_PAD = 0,
  154         IEEE80211_RADIOTAP_FLAGS = 1,
  155         IEEE80211_RADIOTAP_RATE = 2,
  156         IEEE80211_RADIOTAP_CHANNEL = 3,
  157         IEEE80211_RADIOTAP_FHSS = 4,
  158         IEEE80211_RADIOTAP_DB_ANTSIGNAL = 5,
  159         IEEE80211_RADIOTAP_DB_ANTNOISE = 6,
  160         IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
  161         IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
  162         IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
  163         IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
  164         IEEE80211_RADIOTAP_ANTENNA = 11,
  165         IEEE80211_RADIOTAP_TSFT = 12,
  166         IEEE80211_RADIOTAP_EXT = 31,
  167         IEEE80211_RADIOTAP_TIME = 32
  168 };
  169 
  170 /* For IEEE80211_RADIOTAP_FLAGS */
  171 #define IEEE80211_RADIOTAP_F_CFP        0x0001  /* sent/received
  172                                                  * during CFP
  173                                                  */
  174 #define IEEE80211_RADIOTAP_F_SHORTPRE   0x0002  /* sent/received
  175                                                  * with short
  176                                                  * preamble
  177                                                  */
  178 #define IEEE80211_RADIOTAP_F_WEP        0x0004  /* sent/received
  179                                                  * with WEP encryption
  180                                                  */
  181 #define IEEE80211_RADIOTAP_F_FRAG       0x0008  /* sent/received
  182                                                  * with fragmentation
  183                                                  */
  184 
  185 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */

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