The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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 /* $FreeBSD$ */
    2 /* $NetBSD: ieee80211_radiotap.h,v 1.16 2007/01/06 05:51:15 dyoung Exp $ */
    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 _NET80211_IEEE80211_RADIOTAP_H_
   33 #define _NET80211_IEEE80211_RADIOTAP_H_
   34 
   35 /* A generic radio capture format is desirable. It must be
   36  * rigidly defined (e.g., units for fields should be given),
   37  * and easily extensible.
   38  *
   39  * The following is an 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 #if defined(__KERNEL__) || defined(_KERNEL)
   50 #ifndef DLT_IEEE802_11_RADIO
   51 #define DLT_IEEE802_11_RADIO    127     /* 802.11 plus WLAN header */
   52 #endif
   53 #endif /* defined(__KERNEL__) || defined(_KERNEL) */
   54 
   55 #define IEEE80211_RADIOTAP_HDRLEN       64      /* XXX deprecated */
   56 
   57 /*
   58  * The radio capture header precedes the 802.11 header.
   59  *
   60  * Note well: all radiotap fields are little-endian.
   61  */
   62 struct ieee80211_radiotap_header {
   63         uint8_t         it_version;     /* Version 0. Only increases
   64                                          * for drastic changes,
   65                                          * introduction of compatible
   66                                          * new fields does not count.
   67                                          */
   68         uint8_t         it_pad;
   69         uint16_t        it_len;         /* length of the whole
   70                                          * header in bytes, including
   71                                          * it_version, it_pad,
   72                                          * it_len, and data fields.
   73                                          */
   74         uint32_t        it_present;     /* A bitmap telling which
   75                                          * fields are present. Set bit 31
   76                                          * (0x80000000) to extend the
   77                                          * bitmap by another 32 bits.
   78                                          * Additional extensions are made
   79                                          * by setting bit 31.
   80                                          */
   81 } __packed;
   82 
   83 /*
   84  * Name                                 Data type       Units
   85  * ----                                 ---------       -----
   86  *
   87  * IEEE80211_RADIOTAP_TSFT              uint64_t        microseconds
   88  *
   89  *      Value in microseconds of the MAC's 64-bit 802.11 Time
   90  *      Synchronization Function timer when the first bit of the
   91  *      MPDU arrived at the MAC. For received frames, only.
   92  *
   93  * IEEE80211_RADIOTAP_CHANNEL           2 x uint16_t    MHz, bitmap
   94  *
   95  *      Tx/Rx frequency in MHz, followed by flags (see below).
   96  *
   97  * IEEE80211_RADIOTAP_FHSS              uint16_t        see below
   98  *
   99  *      For frequency-hopping radios, the hop set (first byte)
  100  *      and pattern (second byte).
  101  *
  102  * IEEE80211_RADIOTAP_RATE              uint8_t         500kb/s or index
  103  *
  104  *      Tx/Rx data rate.  If bit 0x80 is set then it represents an
  105  *      an MCS index and not an IEEE rate.
  106  *
  107  * IEEE80211_RADIOTAP_DBM_ANTSIGNAL     int8_t          decibels from
  108  *                                                      one milliwatt (dBm)
  109  *
  110  *      RF signal power at the antenna, decibel difference from
  111  *      one milliwatt.
  112  *
  113  * IEEE80211_RADIOTAP_DBM_ANTNOISE      int8_t          decibels from
  114  *                                                      one milliwatt (dBm)
  115  *
  116  *      RF noise power at the antenna, decibel difference from one
  117  *      milliwatt.
  118  *
  119  * IEEE80211_RADIOTAP_DB_ANTSIGNAL      uint8_t         decibel (dB)
  120  *
  121  *      RF signal power at the antenna, decibel difference from an
  122  *      arbitrary, fixed reference.
  123  *
  124  * IEEE80211_RADIOTAP_DB_ANTNOISE       uint8_t         decibel (dB)
  125  *
  126  *      RF noise power at the antenna, decibel difference from an
  127  *      arbitrary, fixed reference point.
  128  *
  129  * IEEE80211_RADIOTAP_LOCK_QUALITY      uint16_t        unitless
  130  *
  131  *      Quality of Barker code lock. Unitless. Monotonically
  132  *      nondecreasing with "better" lock strength. Called "Signal
  133  *      Quality" in datasheets.  (Is there a standard way to measure
  134  *      this?)
  135  *
  136  * IEEE80211_RADIOTAP_TX_ATTENUATION    uint16_t        unitless
  137  *
  138  *      Transmit power expressed as unitless distance from max
  139  *      power set at factory calibration.  0 is max power.
  140  *      Monotonically nondecreasing with lower power levels.
  141  *
  142  * IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t        decibels (dB)
  143  *
  144  *      Transmit power expressed as decibel distance from max power
  145  *      set at factory calibration.  0 is max power.  Monotonically
  146  *      nondecreasing with lower power levels.
  147  *
  148  * IEEE80211_RADIOTAP_DBM_TX_POWER      int8_t          decibels from
  149  *                                                      one milliwatt (dBm)
  150  *
  151  *      Transmit power expressed as dBm (decibels from a 1 milliwatt
  152  *      reference). This is the absolute power level measured at
  153  *      the antenna port.
  154  *
  155  * IEEE80211_RADIOTAP_FLAGS             uint8_t         bitmap
  156  *
  157  *      Properties of transmitted and received frames. See flags
  158  *      defined below.
  159  *
  160  * IEEE80211_RADIOTAP_ANTENNA           uint8_t         antenna index
  161  *
  162  *      Unitless indication of the Rx/Tx antenna for this packet.
  163  *      The first antenna is antenna 0.
  164  *
  165  * IEEE80211_RADIOTAP_XCHANNEL          uint32_t        bitmap
  166  *                                      uint16_t        MHz
  167  *                                      uint8_t         channel number
  168  *                                      int8_t          .5 dBm
  169  *
  170  *      Extended channel specification: flags (see below) followed by
  171  *      frequency in MHz, the corresponding IEEE channel number, and
  172  *      finally the maximum regulatory transmit power cap in .5 dBm
  173  *      units.  This property supersedes IEEE80211_RADIOTAP_CHANNEL
  174  *      and only one of the two should be present.
  175  */
  176 enum ieee80211_radiotap_type {
  177         IEEE80211_RADIOTAP_TSFT = 0,
  178         IEEE80211_RADIOTAP_FLAGS = 1,
  179         IEEE80211_RADIOTAP_RATE = 2,
  180         IEEE80211_RADIOTAP_CHANNEL = 3,
  181         IEEE80211_RADIOTAP_FHSS = 4,
  182         IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
  183         IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
  184         IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
  185         IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
  186         IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
  187         IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
  188         IEEE80211_RADIOTAP_ANTENNA = 11,
  189         IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
  190         IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
  191         /* NB: gap for netbsd definitions */
  192         IEEE80211_RADIOTAP_XCHANNEL = 18,
  193         IEEE80211_RADIOTAP_EXT = 31,
  194 };
  195 
  196 #ifndef _KERNEL
  197 /* channel attributes */
  198 #define IEEE80211_CHAN_TURBO    0x00000010 /* Turbo channel */
  199 #define IEEE80211_CHAN_CCK      0x00000020 /* CCK channel */
  200 #define IEEE80211_CHAN_OFDM     0x00000040 /* OFDM channel */
  201 #define IEEE80211_CHAN_2GHZ     0x00000080 /* 2 GHz spectrum channel. */
  202 #define IEEE80211_CHAN_5GHZ     0x00000100 /* 5 GHz spectrum channel */
  203 #define IEEE80211_CHAN_PASSIVE  0x00000200 /* Only passive scan allowed */
  204 #define IEEE80211_CHAN_DYN      0x00000400 /* Dynamic CCK-OFDM channel */
  205 #define IEEE80211_CHAN_GFSK     0x00000800 /* GFSK channel (FHSS PHY) */
  206 #define IEEE80211_CHAN_GSM      0x00001000 /* 900 MHz spectrum channel */
  207 #define IEEE80211_CHAN_STURBO   0x00002000 /* 11a static turbo channel only */
  208 #define IEEE80211_CHAN_HALF     0x00004000 /* Half rate channel */
  209 #define IEEE80211_CHAN_QUARTER  0x00008000 /* Quarter rate channel */
  210 #endif /* !_KERNEL */
  211 
  212 /* For IEEE80211_RADIOTAP_FLAGS */
  213 #define IEEE80211_RADIOTAP_F_CFP        0x01    /* sent/received
  214                                                  * during CFP
  215                                                  */
  216 #define IEEE80211_RADIOTAP_F_SHORTPRE   0x02    /* sent/received
  217                                                  * with short
  218                                                  * preamble
  219                                                  */
  220 #define IEEE80211_RADIOTAP_F_WEP        0x04    /* sent/received
  221                                                  * with WEP encryption
  222                                                  */
  223 #define IEEE80211_RADIOTAP_F_FRAG       0x08    /* sent/received
  224                                                  * with fragmentation
  225                                                  */
  226 #define IEEE80211_RADIOTAP_F_FCS        0x10    /* frame includes FCS */
  227 #define IEEE80211_RADIOTAP_F_DATAPAD    0x20    /* frame has padding between
  228                                                  * 802.11 header and payload
  229                                                  * (to 32-bit boundary)
  230                                                  */
  231 #define IEEE80211_RADIOTAP_F_BADFCS     0x40    /* does not pass FCS check */
  232 #define IEEE80211_RADIOTAP_F_SHORTGI    0x80    /* HT short GI */
  233 
  234 #endif /* !_NET80211_IEEE80211_RADIOTAP_H_ */

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