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 1.10 2005/01/04 00:34:58 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 _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 #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 /* XXX tcpdump/libpcap do not tolerate variable-length headers,
   56  * yet, so we pad every radiotap header to 64 bytes. Ugh.
   57  */
   58 #define IEEE80211_RADIOTAP_HDRLEN       64
   59 
   60 /* The radio capture header precedes the 802.11 header. */
   61 struct ieee80211_radiotap_header {
   62         u_int8_t        it_version;     /* Version 0. Only increases
   63                                          * for drastic changes,
   64                                          * introduction of compatible
   65                                          * new fields does not count.
   66                                          */
   67         u_int8_t        it_pad;
   68         u_int16_t       it_len;         /* length of the whole
   69                                          * header in bytes, including
   70                                          * it_version, it_pad,
   71                                          * it_len, and data fields.
   72                                          */
   73         u_int32_t       it_present;     /* A bitmap telling which
   74                                          * fields are present. Set bit 31
   75                                          * (0x80000000) to extend the
   76                                          * bitmap by another 32 bits.
   77                                          * Additional extensions are made
   78                                          * by setting bit 31.
   79                                          */
   80 } __attribute__((__packed__));
   81 
   82 /* Name                                 Data type       Units
   83  * ----                                 ---------       -----
   84  *
   85  * IEEE80211_RADIOTAP_TSFT              u_int64_t       microseconds
   86  *
   87  *      Value in microseconds of the MAC's 64-bit 802.11 Time
   88  *      Synchronization Function timer when the first bit of the
   89  *      MPDU arrived at the MAC. For received frames, only.
   90  *
   91  * IEEE80211_RADIOTAP_CHANNEL           2 x u_int16_t   MHz, bitmap
   92  *
   93  *      Tx/Rx frequency in MHz, followed by flags (see below).
   94  *
   95  * IEEE80211_RADIOTAP_FHSS              u_int16_t       see below
   96  *
   97  *      For frequency-hopping radios, the hop set (first byte)
   98  *      and pattern (second byte).
   99  *
  100  * IEEE80211_RADIOTAP_RATE              u_int8_t        500kb/s
  101  *
  102  *      Tx/Rx data rate
  103  *
  104  * IEEE80211_RADIOTAP_DBM_ANTSIGNAL     int8_t          decibels from
  105  *                                                      one milliwatt (dBm)
  106  *
  107  *      RF signal power at the antenna, decibel difference from
  108  *      one milliwatt.
  109  *
  110  * IEEE80211_RADIOTAP_DBM_ANTNOISE      int8_t          decibels from
  111  *                                                      one milliwatt (dBm)
  112  *
  113  *      RF noise power at the antenna, decibel difference from one
  114  *      milliwatt.
  115  *
  116  * IEEE80211_RADIOTAP_DB_ANTSIGNAL      u_int8_t        decibel (dB)
  117  *
  118  *      RF signal power at the antenna, decibel difference from an
  119  *      arbitrary, fixed reference.
  120  *
  121  * IEEE80211_RADIOTAP_DB_ANTNOISE       u_int8_t        decibel (dB)
  122  *
  123  *      RF noise power at the antenna, decibel difference from an
  124  *      arbitrary, fixed reference point.
  125  *
  126  * IEEE80211_RADIOTAP_LOCK_QUALITY      u_int16_t       unitless
  127  *
  128  *      Quality of Barker code lock. Unitless. Monotonically
  129  *      nondecreasing with "better" lock strength. Called "Signal
  130  *      Quality" in datasheets.  (Is there a standard way to measure
  131  *      this?)
  132  *
  133  * IEEE80211_RADIOTAP_TX_ATTENUATION    u_int16_t       unitless
  134  *
  135  *      Transmit power expressed as unitless distance from max
  136  *      power set at factory calibration.  0 is max power.
  137  *      Monotonically nondecreasing with lower power levels.
  138  *
  139  * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t       decibels (dB)
  140  *
  141  *      Transmit power expressed as decibel distance from max power
  142  *      set at factory calibration.  0 is max power.  Monotonically
  143  *      nondecreasing with lower power levels.
  144  *
  145  * IEEE80211_RADIOTAP_DBM_TX_POWER      int8_t          decibels from
  146  *                                                      one milliwatt (dBm)
  147  *
  148  *      Transmit power expressed as dBm (decibels from a 1 milliwatt
  149  *      reference). This is the absolute power level measured at
  150  *      the antenna port.
  151  *
  152  * IEEE80211_RADIOTAP_FLAGS             u_int8_t        bitmap
  153  *
  154  *      Properties of transmitted and received frames. See flags
  155  *      defined below.
  156  *
  157  * IEEE80211_RADIOTAP_ANTENNA           u_int8_t        antenna index
  158  *
  159  *      Unitless indication of the Rx/Tx antenna for this packet.
  160  *      The first antenna is antenna 0.
  161  *
  162  * IEEE80211_RADIOTAP_FCS               u_int32_t       data
  163  *
  164  *      FCS from frame in network byte order.
  165  */
  166 enum ieee80211_radiotap_type {
  167         IEEE80211_RADIOTAP_TSFT = 0,
  168         IEEE80211_RADIOTAP_FLAGS = 1,
  169         IEEE80211_RADIOTAP_RATE = 2,
  170         IEEE80211_RADIOTAP_CHANNEL = 3,
  171         IEEE80211_RADIOTAP_FHSS = 4,
  172         IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
  173         IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
  174         IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
  175         IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
  176         IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
  177         IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
  178         IEEE80211_RADIOTAP_ANTENNA = 11,
  179         IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
  180         IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
  181         IEEE80211_RADIOTAP_EXT = 31,
  182 };
  183 
  184 #ifndef _KERNEL
  185 /* Channel flags. */
  186 #define IEEE80211_CHAN_TURBO    0x0010  /* Turbo channel */
  187 #define IEEE80211_CHAN_CCK      0x0020  /* CCK channel */
  188 #define IEEE80211_CHAN_OFDM     0x0040  /* OFDM channel */
  189 #define IEEE80211_CHAN_2GHZ     0x0080  /* 2 GHz spectrum channel. */
  190 #define IEEE80211_CHAN_5GHZ     0x0100  /* 5 GHz spectrum channel */
  191 #define IEEE80211_CHAN_PASSIVE  0x0200  /* Only passive scan allowed */
  192 #define IEEE80211_CHAN_DYN      0x0400  /* Dynamic CCK-OFDM channel */
  193 #define IEEE80211_CHAN_GFSK     0x0800  /* GFSK channel (FHSS PHY) */
  194 #endif /* !_KERNEL */
  195 
  196 /* For IEEE80211_RADIOTAP_FLAGS */
  197 #define IEEE80211_RADIOTAP_F_CFP        0x01    /* sent/received
  198                                                  * during CFP
  199                                                  */
  200 #define IEEE80211_RADIOTAP_F_SHORTPRE   0x02    /* sent/received
  201                                                  * with short
  202                                                  * preamble
  203                                                  */
  204 #define IEEE80211_RADIOTAP_F_WEP        0x04    /* sent/received
  205                                                  * with WEP encryption
  206                                                  */
  207 #define IEEE80211_RADIOTAP_F_FRAG       0x08    /* sent/received
  208                                                  * with fragmentation
  209                                                  */
  210 #define IEEE80211_RADIOTAP_F_FCS        0x10    /* frame includes FCS */
  211 #define IEEE80211_RADIOTAP_F_DATAPAD    0x20    /* frame has padding between
  212                                                  * 802.11 header and payload
  213                                                  * (to 32-bit boundary)
  214                                                  */
  215 
  216 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */

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