include/net/ieee80211_radiotap.h

   1 /*
   2  * Copyright (c) 2003, 2004 David Young.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  * 3. The name of David Young may not be used to endorse or promote
  13  *    products derived from this software without specific prior
  14  *    written permission.
  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
  30 /*
  31  * Modifications to fit into the linux IEEE 802.11 stack,
  32  * Mike Kershaw (dragorn@kismetwireless.net)
  33  */
  34
  35 #ifndef IEEE80211RADIOTAP_H
  36 #define IEEE80211RADIOTAP_H
  37
  38 #include <linux/if_ether.h>
  39 #include <linux/kernel.h>
  40 #include <asm/unaligned.h>
  41
  42 /* Base version of the radiotap packet header data */
  43 #define PKTHDR_RADIOTAP_VERSION         0
  44
  45 /* A generic radio capture format is desirable. There is one for
  46  * Linux, but it is neither rigidly defined (there were not even
  47  * units given for some fields) nor easily extensible.
  48  *
  49  * I suggest the following extensible radio capture format. It is
  50  * based on a bitmap indicating which fields are present.
  51  *
  52  * I am trying to describe precisely what the application programmer
  53  * should expect in the following, and for that reason I tell the
  54  * units and origin of each measurement (where it applies), or else I
  55  * use sufficiently weaselly language ("is a monotonically nondecreasing
  56  * function of...") that I cannot set false expectations for lawyerly
  57  * readers.
  58  */
  59
  60 /*
  61  * The radio capture header precedes the 802.11 header.
  62  * All data in the header is little endian on all platforms.
  63  */
  64 struct ieee80211_radiotap_header {
  65         u8 it_version;          /* Version 0. Only increases
  66                                  * for drastic changes,
  67                                  * introduction of compatible
  68                                  * new fields does not count.
  69                                  */
  70         u8 it_pad;
  71         __le16 it_len;          /* length of the whole
  72                                  * header in bytes, including
  73                                  * it_version, it_pad,
  74                                  * it_len, and data fields.
  75                                  */
  76         __le32 it_present;      /* A bitmap telling which
  77                                  * fields are present. Set bit 31
  78                                  * (0x80000000) to extend the
  79                                  * bitmap by another 32 bits.
  80                                  * Additional extensions are made
  81                                  * by setting bit 31.
  82                                  */
  83 } __packed;
  84
  85 /* Name                                 Data type    Units
  86  * ----                                 ---------    -----
  87  *
  88  * IEEE80211_RADIOTAP_TSFT              __le64       microseconds
  89  *
  90  *      Value in microseconds of the MAC's 64-bit 802.11 Time
  91  *      Synchronization Function timer when the first bit of the
  92  *      MPDU arrived at the MAC. For received frames, only.
  93  *
  94  * IEEE80211_RADIOTAP_CHANNEL           2 x __le16   MHz, bitmap
  95  *
  96  *      Tx/Rx frequency in MHz, followed by flags (see below).
  97  *
  98  * IEEE80211_RADIOTAP_FHSS              __le16       see below
  99  *
 100  *      For frequency-hopping radios, the hop set (first byte)
 101  *      and pattern (second byte).
 102  *
 103  * IEEE80211_RADIOTAP_RATE              u8           500kb/s
 104  *
 105  *      Tx/Rx data rate
 106  *
 107  * IEEE80211_RADIOTAP_DBM_ANTSIGNAL     s8           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      s8           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      u8           decibel (dB)
 120  *
 121  *      RF signal power at the antenna, decibel difference from an
 122  *      arbitrary, fixed reference.
 123  *
 124  * IEEE80211_RADIOTAP_DB_ANTNOISE       u8           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      __le16       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    __le16       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 __le16       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      s8           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             u8           bitmap
 156  *
 157  *      Properties of transmitted and received frames. See flags
 158  *      defined below.
 159  *
 160  * IEEE80211_RADIOTAP_ANTENNA           u8           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_RX_FLAGS          __le16       bitmap
 166  *
 167  *     Properties of received frames. See flags defined below.
 168  *
 169  * IEEE80211_RADIOTAP_TX_FLAGS          __le16       bitmap
 170  *
 171  *     Properties of transmitted frames. See flags defined below.
 172  *
 173  * IEEE80211_RADIOTAP_RTS_RETRIES       u8           data
 174  *
 175  *     Number of rts retries a transmitted frame used.
 176  *
 177  * IEEE80211_RADIOTAP_DATA_RETRIES      u8           data
 178  *
 179  *     Number of unicast retries a transmitted frame used.
 180  *
 181  * IEEE80211_RADIOTAP_MCS       u8, u8, u8              unitless
 182  *
 183  *     Contains a bitmap of known fields/flags, the flags, and
 184  *     the MCS index.
 185  *
 186  * IEEE80211_RADIOTAP_AMPDU_STATUS      u32, u16, u8, u8        unitless
 187  *
 188  *      Contains the AMPDU information for the subframe.
 189  *
 190  * IEEE80211_RADIOTAP_VHT       u16, u8, u8, u8[4], u8, u8, u16
 191  *
 192  *      Contains VHT information about this frame.
 193  *
 194  * IEEE80211_RADIOTAP_TIMESTAMP         u64, u16, u8, u8        variable
 195  *
 196  *      Contains timestamp information for this frame.
 197  */
 198 enum ieee80211_radiotap_type {
 199         IEEE80211_RADIOTAP_TSFT = 0,
 200         IEEE80211_RADIOTAP_FLAGS = 1,
 201         IEEE80211_RADIOTAP_RATE = 2,
 202         IEEE80211_RADIOTAP_CHANNEL = 3,
 203         IEEE80211_RADIOTAP_FHSS = 4,
 204         IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
 205         IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
 206         IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
 207         IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
 208         IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
 209         IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
 210         IEEE80211_RADIOTAP_ANTENNA = 11,
 211         IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
 212         IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
 213         IEEE80211_RADIOTAP_RX_FLAGS = 14,
 214         IEEE80211_RADIOTAP_TX_FLAGS = 15,
 215         IEEE80211_RADIOTAP_RTS_RETRIES = 16,
 216         IEEE80211_RADIOTAP_DATA_RETRIES = 17,
 217
 218         IEEE80211_RADIOTAP_MCS = 19,
 219         IEEE80211_RADIOTAP_AMPDU_STATUS = 20,
 220         IEEE80211_RADIOTAP_VHT = 21,
 221         IEEE80211_RADIOTAP_TIMESTAMP = 22,
 222
 223         /* valid in every it_present bitmap, even vendor namespaces */
 224         IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
 225         IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30,
 226         IEEE80211_RADIOTAP_EXT = 31
 227 };
 228
 229 /* Channel flags. */
 230 #define IEEE80211_CHAN_TURBO    0x0010  /* Turbo channel */
 231 #define IEEE80211_CHAN_CCK      0x0020  /* CCK channel */
 232 #define IEEE80211_CHAN_OFDM     0x0040  /* OFDM channel */
 233 #define IEEE80211_CHAN_2GHZ     0x0080  /* 2 GHz spectrum channel. */
 234 #define IEEE80211_CHAN_5GHZ     0x0100  /* 5 GHz spectrum channel */
 235 #define IEEE80211_CHAN_PASSIVE  0x0200  /* Only passive scan allowed */
 236 #define IEEE80211_CHAN_DYN      0x0400  /* Dynamic CCK-OFDM channel */
 237 #define IEEE80211_CHAN_GFSK     0x0800  /* GFSK channel (FHSS PHY) */
 238 #define IEEE80211_CHAN_GSM      0x1000  /* GSM (900 MHz) */
 239 #define IEEE80211_CHAN_STURBO   0x2000  /* Static Turbo */
 240 #define IEEE80211_CHAN_HALF     0x4000  /* Half channel (10 MHz wide) */
 241 #define IEEE80211_CHAN_QUARTER  0x8000  /* Quarter channel (5 MHz wide) */
 242
 243 /* For IEEE80211_RADIOTAP_FLAGS */
 244 #define IEEE80211_RADIOTAP_F_CFP        0x01    /* sent/received
 245                                                  * during CFP
 246                                                  */
 247 #define IEEE80211_RADIOTAP_F_SHORTPRE   0x02    /* sent/received
 248                                                  * with short
 249                                                  * preamble
 250                                                  */
 251 #define IEEE80211_RADIOTAP_F_WEP        0x04    /* sent/received
 252                                                  * with WEP encryption
 253                                                  */
 254 #define IEEE80211_RADIOTAP_F_FRAG       0x08    /* sent/received
 255                                                  * with fragmentation
 256                                                  */
 257 #define IEEE80211_RADIOTAP_F_FCS        0x10    /* frame includes FCS */
 258 #define IEEE80211_RADIOTAP_F_DATAPAD    0x20    /* frame has padding between
 259                                                  * 802.11 header and payload
 260                                                  * (to 32-bit boundary)
 261                                                  */
 262 #define IEEE80211_RADIOTAP_F_BADFCS     0x40    /* bad FCS */
 263
 264 /* For IEEE80211_RADIOTAP_RX_FLAGS */
 265 #define IEEE80211_RADIOTAP_F_RX_BADPLCP 0x0002  /* frame has bad PLCP */
 266
 267 /* For IEEE80211_RADIOTAP_TX_FLAGS */
 268 #define IEEE80211_RADIOTAP_F_TX_FAIL    0x0001  /* failed due to excessive
 269                                                  * retries */
 270 #define IEEE80211_RADIOTAP_F_TX_CTS     0x0002  /* used cts 'protection' */
 271 #define IEEE80211_RADIOTAP_F_TX_RTS     0x0004  /* used rts/cts handshake */
 272 #define IEEE80211_RADIOTAP_F_TX_NOACK   0x0008  /* don't expect an ack */
 273
 274
 275 /* For IEEE80211_RADIOTAP_MCS */
 276 #define IEEE80211_RADIOTAP_MCS_HAVE_BW          0x01
 277 #define IEEE80211_RADIOTAP_MCS_HAVE_MCS         0x02
 278 #define IEEE80211_RADIOTAP_MCS_HAVE_GI          0x04
 279 #define IEEE80211_RADIOTAP_MCS_HAVE_FMT         0x08
 280 #define IEEE80211_RADIOTAP_MCS_HAVE_FEC         0x10
 281 #define IEEE80211_RADIOTAP_MCS_HAVE_STBC        0x20
 282
 283 #define IEEE80211_RADIOTAP_MCS_BW_MASK          0x03
 284 #define         IEEE80211_RADIOTAP_MCS_BW_20    0
 285 #define         IEEE80211_RADIOTAP_MCS_BW_40    1
 286 #define         IEEE80211_RADIOTAP_MCS_BW_20L   2
 287 #define         IEEE80211_RADIOTAP_MCS_BW_20U   3
 288 #define IEEE80211_RADIOTAP_MCS_SGI              0x04
 289 #define IEEE80211_RADIOTAP_MCS_FMT_GF           0x08
 290 #define IEEE80211_RADIOTAP_MCS_FEC_LDPC         0x10
 291 #define IEEE80211_RADIOTAP_MCS_STBC_MASK        0x60
 292 #define         IEEE80211_RADIOTAP_MCS_STBC_1   1
 293 #define         IEEE80211_RADIOTAP_MCS_STBC_2   2
 294 #define         IEEE80211_RADIOTAP_MCS_STBC_3   3
 295
 296 #define IEEE80211_RADIOTAP_MCS_STBC_SHIFT       5
 297
 298 /* For IEEE80211_RADIOTAP_AMPDU_STATUS */
 299 #define IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN         0x0001
 300 #define IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN             0x0002
 301 #define IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN             0x0004
 302 #define IEEE80211_RADIOTAP_AMPDU_IS_LAST                0x0008
 303 #define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR          0x0010
 304 #define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN        0x0020
 305
 306 /* For IEEE80211_RADIOTAP_VHT */
 307 #define IEEE80211_RADIOTAP_VHT_KNOWN_STBC                       0x0001
 308 #define IEEE80211_RADIOTAP_VHT_KNOWN_TXOP_PS_NA                 0x0002
 309 #define IEEE80211_RADIOTAP_VHT_KNOWN_GI                         0x0004
 310 #define IEEE80211_RADIOTAP_VHT_KNOWN_SGI_NSYM_DIS               0x0008
 311 #define IEEE80211_RADIOTAP_VHT_KNOWN_LDPC_EXTRA_OFDM_SYM        0x0010
 312 #define IEEE80211_RADIOTAP_VHT_KNOWN_BEAMFORMED                 0x0020
 313 #define IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH                  0x0040
 314 #define IEEE80211_RADIOTAP_VHT_KNOWN_GROUP_ID                   0x0080
 315 #define IEEE80211_RADIOTAP_VHT_KNOWN_PARTIAL_AID                0x0100
 316
 317 #define IEEE80211_RADIOTAP_VHT_FLAG_STBC                        0x01
 318 #define IEEE80211_RADIOTAP_VHT_FLAG_TXOP_PS_NA                  0x02
 319 #define IEEE80211_RADIOTAP_VHT_FLAG_SGI                         0x04
 320 #define IEEE80211_RADIOTAP_VHT_FLAG_SGI_NSYM_M10_9              0x08
 321 #define IEEE80211_RADIOTAP_VHT_FLAG_LDPC_EXTRA_OFDM_SYM         0x10
 322 #define IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED                  0x20
 323
 324 #define IEEE80211_RADIOTAP_CODING_LDPC_USER0                    0x01
 325 #define IEEE80211_RADIOTAP_CODING_LDPC_USER1                    0x02
 326 #define IEEE80211_RADIOTAP_CODING_LDPC_USER2                    0x04
 327 #define IEEE80211_RADIOTAP_CODING_LDPC_USER3                    0x08
 328
 329 /* For IEEE80211_RADIOTAP_TIMESTAMP */
 330 #define IEEE80211_RADIOTAP_TIMESTAMP_UNIT_MASK                  0x000F
 331 #define IEEE80211_RADIOTAP_TIMESTAMP_UNIT_MS                    0x0000
 332 #define IEEE80211_RADIOTAP_TIMESTAMP_UNIT_US                    0x0001
 333 #define IEEE80211_RADIOTAP_TIMESTAMP_UNIT_NS                    0x0003
 334 #define IEEE80211_RADIOTAP_TIMESTAMP_SPOS_MASK                  0x00F0
 335 #define IEEE80211_RADIOTAP_TIMESTAMP_SPOS_BEGIN_MDPU            0x0000
 336 #define IEEE80211_RADIOTAP_TIMESTAMP_SPOS_EO_MPDU               0x0010
 337 #define IEEE80211_RADIOTAP_TIMESTAMP_SPOS_EO_PPDU               0x0020
 338 #define IEEE80211_RADIOTAP_TIMESTAMP_SPOS_PLCP_SIG_ACQ          0x0030
 339 #define IEEE80211_RADIOTAP_TIMESTAMP_SPOS_UNKNOWN               0x00F0
 340
 341 #define IEEE80211_RADIOTAP_TIMESTAMP_FLAG_64BIT                 0x00
 342 #define IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT                 0x01
 343 #define IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY              0x02
 344
 345 /* helpers */
 346 static inline int ieee80211_get_radiotap_len(unsigned char *data)
 347 {
 348         struct ieee80211_radiotap_header *hdr =
 349                 (struct ieee80211_radiotap_header *)data;
 350
 351         return get_unaligned_le16(&hdr->it_len);
 352 }
 353
 354 #endif                          /* IEEE80211_RADIOTAP_H */