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: src/sys/net80211/ieee80211_radiotap.h,v 1.11 2007/12/13 01:23:40 sam Exp $ */
    2 /* $NetBSD: ieee80211_radiotap.h,v 1.24 2011/02/25 10:45:57 tron 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  *
   16  * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
   17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   18  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   19  * PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL DAVID
   20  * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   21  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
   22  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   27  * OF SUCH DAMAGE.
   28  */
   29 #ifndef _NET80211_IEEE80211_RADIOTAP_H_
   30 #define _NET80211_IEEE80211_RADIOTAP_H_
   31 
   32 /* A generic radio capture format is desirable. It must be
   33  * rigidly defined (e.g., units for fields should be given),
   34  * and easily extensible.
   35  *
   36  * The following is an extensible radio capture format. It is
   37  * based on a bitmap indicating which fields are present.
   38  *
   39  * I am trying to describe precisely what the application programmer
   40  * should expect in the following, and for that reason I tell the
   41  * units and origin of each measurement (where it applies), or else I
   42  * use sufficiently weaselly language ("is a monotonically nondecreasing
   43  * function of...") that I cannot set false expectations for lawyerly
   44  * readers.
   45  */
   46 #if defined(__KERNEL__) || defined(_KERNEL)
   47 #ifndef DLT_IEEE802_11_RADIO
   48 #define DLT_IEEE802_11_RADIO    127     /* 802.11 plus WLAN header */
   49 #endif
   50 #endif /* defined(__KERNEL__) || defined(_KERNEL) */
   51 
   52 /* XXX tcpdump/libpcap do not tolerate variable-length headers,
   53  * yet, so we pad every radiotap header to 64 bytes. Ugh.
   54  */
   55 #define IEEE80211_RADIOTAP_HDRLEN       64
   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 __aligned(8);
   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
  103  *
  104  *      Tx/Rx data rate
  105  *
  106  * IEEE80211_RADIOTAP_DBM_ANTSIGNAL     int8_t          decibels from
  107  *                                                      one milliwatt (dBm)
  108  *
  109  *      RF signal power at the antenna, decibel difference from
  110  *      one milliwatt.
  111  *
  112  * IEEE80211_RADIOTAP_DBM_ANTNOISE      int8_t          decibels from
  113  *                                                      one milliwatt (dBm)
  114  *
  115  *      RF noise power at the antenna, decibel difference from one
  116  *      milliwatt.
  117  *
  118  * IEEE80211_RADIOTAP_DB_ANTSIGNAL      uint8_t         decibel (dB)
  119  *
  120  *      RF signal power at the antenna, decibel difference from an
  121  *      arbitrary, fixed reference.
  122  *
  123  * IEEE80211_RADIOTAP_DB_ANTNOISE       uint8_t         decibel (dB)
  124  *
  125  *      RF noise power at the antenna, decibel difference from an
  126  *      arbitrary, fixed reference point.
  127  *
  128  * IEEE80211_RADIOTAP_LOCK_QUALITY      uint16_t        unitless
  129  *
  130  *      Quality of Barker code lock. Unitless. Monotonically
  131  *      nondecreasing with "better" lock strength. Called "Signal
  132  *      Quality" in datasheets.  (Is there a standard way to measure
  133  *      this?)
  134  *
  135  * IEEE80211_RADIOTAP_TX_ATTENUATION    uint16_t        unitless
  136  *
  137  *      Transmit power expressed as unitless distance from max
  138  *      power set at factory calibration.  0 is max power.
  139  *      Monotonically nondecreasing with lower power levels.
  140  *
  141  * IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t        decibels (dB)
  142  *
  143  *      Transmit power expressed as decibel distance from max power
  144  *      set at factory calibration.  0 is max power.  Monotonically
  145  *      nondecreasing with lower power levels.
  146  *
  147  * IEEE80211_RADIOTAP_DBM_TX_POWER      int8_t          decibels from
  148  *                                                      one milliwatt (dBm)
  149  *
  150  *      Transmit power expressed as dBm (decibels from a 1 milliwatt
  151  *      reference). This is the absolute power level measured at
  152  *      the antenna port.
  153  *
  154  * IEEE80211_RADIOTAP_FLAGS             uint8_t         bitmap
  155  *
  156  *      Properties of transmitted and received frames. See flags
  157  *      defined below.
  158  *
  159  * IEEE80211_RADIOTAP_ANTENNA           uint8_t         antenna index
  160  *
  161  *      Unitless indication of the Rx/Tx antenna for this packet.
  162  *      The first antenna is antenna 0.
  163  *
  164  * IEEE80211_RADIOTAP_RX_FLAGS          uint16_t        bitmap
  165  *
  166  *     Properties of received frames. See flags defined below.
  167  *
  168  * IEEE80211_RADIOTAP_TX_FLAGS          uint16_t        bitmap
  169  *
  170  *     Properties of transmitted frames. See flags defined below.
  171  *
  172  * IEEE80211_RADIOTAP_RTS_RETRIES       uint8_t         data
  173  *
  174  *     Number of rts retries a transmitted frame used.
  175  *
  176  * IEEE80211_RADIOTAP_DATA_RETRIES      uint8_t         data
  177  *
  178  *     Number of unicast retries a transmitted frame used.
  179  *
  180  * IEEE80211_RADIOTAP_XCHANNEL          uint32_t        bitmap
  181  *                                      uint16_t        MHz
  182  *                                      uint8_t         channel number
  183  *                                      int8_t          .5 dBm
  184  *
  185  *      Extended channel specification: flags (see below) followed by
  186  *      frequency in MHz, the corresponding IEEE channel number, and
  187  *      finally the maximum regulatory transmit power cap in .5 dBm
  188  *      units.  This property supersedes IEEE80211_RADIOTAP_CHANNEL
  189  *      and only one of the two should be present.
  190  */
  191 enum ieee80211_radiotap_type {
  192         IEEE80211_RADIOTAP_TSFT = 0,
  193         IEEE80211_RADIOTAP_FLAGS = 1,
  194         IEEE80211_RADIOTAP_RATE = 2,
  195         IEEE80211_RADIOTAP_CHANNEL = 3,
  196         IEEE80211_RADIOTAP_FHSS = 4,
  197         IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
  198         IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
  199         IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
  200         IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
  201         IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
  202         IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
  203         IEEE80211_RADIOTAP_ANTENNA = 11,
  204         IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
  205         IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
  206         IEEE80211_RADIOTAP_RX_FLAGS = 14,
  207         IEEE80211_RADIOTAP_TX_FLAGS = 15,
  208         IEEE80211_RADIOTAP_RTS_RETRIES = 16,
  209         IEEE80211_RADIOTAP_DATA_RETRIES = 17,
  210         IEEE80211_RADIOTAP_XCHANNEL = 18,
  211         IEEE80211_RADIOTAP_EXT = 31
  212 };
  213 
  214 /* For IEEE80211_RADIOTAP_FLAGS */
  215 #define IEEE80211_RADIOTAP_F_CFP        0x01    /* sent/received
  216                                                  * during CFP
  217                                                  */
  218 #define IEEE80211_RADIOTAP_F_SHORTPRE   0x02    /* sent/received
  219                                                  * with short
  220                                                  * preamble
  221                                                  */
  222 #define IEEE80211_RADIOTAP_F_WEP        0x04    /* sent/received
  223                                                  * with WEP encryption
  224                                                  */
  225 #define IEEE80211_RADIOTAP_F_FRAG       0x08    /* sent/received
  226                                                  * with fragmentation
  227                                                  */
  228 #define IEEE80211_RADIOTAP_F_FCS        0x10    /* frame includes FCS */
  229 #define IEEE80211_RADIOTAP_F_DATAPAD    0x20    /* frame has padding between
  230                                                  * 802.11 header and payload
  231                                                  * (to 32-bit boundary)
  232                                                  */
  233 #define IEEE80211_RADIOTAP_F_BADFCS     0x40    /* does not pass FCS check */
  234 #define IEEE80211_RADIOTAP_F_SHORTGI    0x80    /* HT short GI */
  235 
  236 /* For IEEE80211_RADIOTAP_RX_FLAGS */
  237 #define IEEE80211_RADIOTAP_F_RX_BADFCS 0x0001  /* Frame failed CRC check.
  238                                                 *
  239                                                 * Deprecated: use the flag
  240                                                 * IEEE80211_RADIOTAP_F_BADFCS in
  241                                                 * the IEEE80211_RADIOTAP_FLAGS
  242                                                 * field, instead.
  243                                                 */
  244 
  245 /* For IEEE80211_RADIOTAP_TX_FLAGS */
  246 #define IEEE80211_RADIOTAP_F_TX_FAIL   0x0001  /* failed due to excessive
  247                                                 * retries
  248                                                 */
  249 #define IEEE80211_RADIOTAP_F_TX_CTS    0x0002  /* used cts 'protection' */
  250 #define IEEE80211_RADIOTAP_F_TX_RTS    0x0004  /* used rts/cts handshake */
  251 
  252 #endif /* !_NET80211_IEEE80211_RADIOTAP_H_ */

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