1 /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5 2005/01/22 20:12:05 sam Exp $ */
2 /* $NetBSD: ieee80211_radiotap.h,v 1.11 2005/06/22 06:16:02 dyoung Exp $ */
5 * Copyright (c) 2003, 2004 David Young. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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,
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25 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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34 * Modifications to fit into the linux IEEE 802.11 stack,
35 * Mike Kershaw (dragorn@kismetwireless.net)
38 #ifndef IEEE80211RADIOTAP_H
39 #define IEEE80211RADIOTAP_H
41 #include <linux/if_ether.h>
42 #include <linux/kernel.h>
44 /* Radiotap header version (from official NetBSD feed) */
45 #define IEEE80211RADIOTAP_VERSION "1.5"
46 /* Base version of the radiotap packet header data */
47 #define PKTHDR_RADIOTAP_VERSION 0
49 /* A generic radio capture format is desirable. There is one for
50 * Linux, but it is neither rigidly defined (there were not even
51 * units given for some fields) nor easily extensible.
53 * I suggest the following extensible radio capture format. It is
54 * based on a bitmap indicating which fields are present.
56 * I am trying to describe precisely what the application programmer
57 * should expect in the following, and for that reason I tell the
58 * units and origin of each measurement (where it applies), or else I
59 * use sufficiently weaselly language ("is a monotonically nondecreasing
60 * function of...") that I cannot set false expectations for lawyerly
64 /* XXX tcpdump/libpcap do not tolerate variable-length headers,
65 * yet, so we pad every radiotap header to 64 bytes. Ugh.
67 #define IEEE80211_RADIOTAP_HDRLEN 64
69 /* The radio capture header precedes the 802.11 header.
70 * All data in the header is little endian on all platforms.
72 struct ieee80211_radiotap_header {
73 u8 it_version; /* Version 0. Only increases
74 * for drastic changes,
75 * introduction of compatible
76 * new fields does not count.
79 __le16 it_len; /* length of the whole
80 * header in bytes, including
82 * it_len, and data fields.
84 __le32 it_present; /* A bitmap telling which
85 * fields are present. Set bit 31
86 * (0x80000000) to extend the
87 * bitmap by another 32 bits.
88 * Additional extensions are made
93 /* Name Data type Units
94 * ---- --------- -----
96 * IEEE80211_RADIOTAP_TSFT __le64 microseconds
98 * Value in microseconds of the MAC's 64-bit 802.11 Time
99 * Synchronization Function timer when the first bit of the
100 * MPDU arrived at the MAC. For received frames, only.
102 * IEEE80211_RADIOTAP_CHANNEL 2 x __le16 MHz, bitmap
104 * Tx/Rx frequency in MHz, followed by flags (see below).
106 * IEEE80211_RADIOTAP_FHSS __le16 see below
108 * For frequency-hopping radios, the hop set (first byte)
109 * and pattern (second byte).
111 * IEEE80211_RADIOTAP_RATE u8 500kb/s
115 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL s8 decibels from
116 * one milliwatt (dBm)
118 * RF signal power at the antenna, decibel difference from
121 * IEEE80211_RADIOTAP_DBM_ANTNOISE s8 decibels from
122 * one milliwatt (dBm)
124 * RF noise power at the antenna, decibel difference from one
127 * IEEE80211_RADIOTAP_DB_ANTSIGNAL u8 decibel (dB)
129 * RF signal power at the antenna, decibel difference from an
130 * arbitrary, fixed reference.
132 * IEEE80211_RADIOTAP_DB_ANTNOISE u8 decibel (dB)
134 * RF noise power at the antenna, decibel difference from an
135 * arbitrary, fixed reference point.
137 * IEEE80211_RADIOTAP_LOCK_QUALITY __le16 unitless
139 * Quality of Barker code lock. Unitless. Monotonically
140 * nondecreasing with "better" lock strength. Called "Signal
141 * Quality" in datasheets. (Is there a standard way to measure
144 * IEEE80211_RADIOTAP_TX_ATTENUATION __le16 unitless
146 * Transmit power expressed as unitless distance from max
147 * power set at factory calibration. 0 is max power.
148 * Monotonically nondecreasing with lower power levels.
150 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION __le16 decibels (dB)
152 * Transmit power expressed as decibel distance from max power
153 * set at factory calibration. 0 is max power. Monotonically
154 * nondecreasing with lower power levels.
156 * IEEE80211_RADIOTAP_DBM_TX_POWER s8 decibels from
157 * one milliwatt (dBm)
159 * Transmit power expressed as dBm (decibels from a 1 milliwatt
160 * reference). This is the absolute power level measured at
163 * IEEE80211_RADIOTAP_FLAGS u8 bitmap
165 * Properties of transmitted and received frames. See flags
168 * IEEE80211_RADIOTAP_ANTENNA u8 antenna index
170 * Unitless indication of the Rx/Tx antenna for this packet.
171 * The first antenna is antenna 0.
173 * IEEE80211_RADIOTAP_RX_FLAGS __le16 bitmap
175 * Properties of received frames. See flags defined below.
177 * IEEE80211_RADIOTAP_TX_FLAGS __le16 bitmap
179 * Properties of transmitted frames. See flags defined below.
181 * IEEE80211_RADIOTAP_RTS_RETRIES u8 data
183 * Number of rts retries a transmitted frame used.
185 * IEEE80211_RADIOTAP_DATA_RETRIES u8 data
187 * Number of unicast retries a transmitted frame used.
190 enum ieee80211_radiotap_type {
191 IEEE80211_RADIOTAP_TSFT = 0,
192 IEEE80211_RADIOTAP_FLAGS = 1,
193 IEEE80211_RADIOTAP_RATE = 2,
194 IEEE80211_RADIOTAP_CHANNEL = 3,
195 IEEE80211_RADIOTAP_FHSS = 4,
196 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
197 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
198 IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
199 IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
200 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
201 IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
202 IEEE80211_RADIOTAP_ANTENNA = 11,
203 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
204 IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
205 IEEE80211_RADIOTAP_RX_FLAGS = 14,
206 IEEE80211_RADIOTAP_TX_FLAGS = 15,
207 IEEE80211_RADIOTAP_RTS_RETRIES = 16,
208 IEEE80211_RADIOTAP_DATA_RETRIES = 17,
209 IEEE80211_RADIOTAP_EXT = 31
213 #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
214 #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
215 #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
216 #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
217 #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */
218 #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */
219 #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */
220 #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */
222 /* For IEEE80211_RADIOTAP_FLAGS */
223 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
226 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
230 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
231 * with WEP encryption
233 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
236 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
237 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
238 * 802.11 header and payload
239 * (to 32-bit boundary)
241 /* For IEEE80211_RADIOTAP_RX_FLAGS */
242 #define IEEE80211_RADIOTAP_F_RX_BADFCS 0x0001 /* frame failed crc check */
244 /* For IEEE80211_RADIOTAP_TX_FLAGS */
245 #define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive
247 #define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */
248 #define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */
250 /* Ugly macro to convert literal channel numbers into their mhz equivalents
251 * There are certianly some conditions that will break this (like feeding it '30')
252 * but they shouldn't arise since nothing talks on channel 30. */
253 #define ieee80211chan2mhz(x) \
255 (((x) == 14) ? 2484 : ((x) * 5) + 2407) : \
258 #endif /* IEEE80211_RADIOTAP_H */