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.
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8 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
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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
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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 struct ieee80211_radiotap_header {
71 u8 it_version; /* Version 0. Only increases
72 * for drastic changes,
73 * introduction of compatible
74 * new fields does not count.
77 u16 it_len; /* length of the whole
78 * header in bytes, including
80 * it_len, and data fields.
82 u32 it_present; /* A bitmap telling which
83 * fields are present. Set bit 31
84 * (0x80000000) to extend the
85 * bitmap by another 32 bits.
86 * Additional extensions are made
91 /* Name Data type Units
92 * ---- --------- -----
94 * IEEE80211_RADIOTAP_TSFT u64 microseconds
96 * Value in microseconds of the MAC's 64-bit 802.11 Time
97 * Synchronization Function timer when the first bit of the
98 * MPDU arrived at the MAC. For received frames, only.
100 * IEEE80211_RADIOTAP_CHANNEL 2 x u16 MHz, bitmap
102 * Tx/Rx frequency in MHz, followed by flags (see below).
104 * IEEE80211_RADIOTAP_FHSS u16 see below
106 * For frequency-hopping radios, the hop set (first byte)
107 * and pattern (second byte).
109 * IEEE80211_RADIOTAP_RATE u8 500kb/s
113 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from
114 * one milliwatt (dBm)
116 * RF signal power at the antenna, decibel difference from
119 * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from
120 * one milliwatt (dBm)
122 * RF noise power at the antenna, decibel difference from one
125 * IEEE80211_RADIOTAP_DB_ANTSIGNAL u8 decibel (dB)
127 * RF signal power at the antenna, decibel difference from an
128 * arbitrary, fixed reference.
130 * IEEE80211_RADIOTAP_DB_ANTNOISE u8 decibel (dB)
132 * RF noise power at the antenna, decibel difference from an
133 * arbitrary, fixed reference point.
135 * IEEE80211_RADIOTAP_LOCK_QUALITY u16 unitless
137 * Quality of Barker code lock. Unitless. Monotonically
138 * nondecreasing with "better" lock strength. Called "Signal
139 * Quality" in datasheets. (Is there a standard way to measure
142 * IEEE80211_RADIOTAP_TX_ATTENUATION u16 unitless
144 * Transmit power expressed as unitless distance from max
145 * power set at factory calibration. 0 is max power.
146 * Monotonically nondecreasing with lower power levels.
148 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u16 decibels (dB)
150 * Transmit power expressed as decibel distance from max power
151 * set at factory calibration. 0 is max power. Monotonically
152 * nondecreasing with lower power levels.
154 * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from
155 * one milliwatt (dBm)
157 * Transmit power expressed as dBm (decibels from a 1 milliwatt
158 * reference). This is the absolute power level measured at
161 * IEEE80211_RADIOTAP_FLAGS u8 bitmap
163 * Properties of transmitted and received frames. See flags
166 * IEEE80211_RADIOTAP_ANTENNA u8 antenna index
168 * Unitless indication of the Rx/Tx antenna for this packet.
169 * The first antenna is antenna 0.
171 * IEEE80211_RADIOTAP_FCS u32 data
173 * FCS from frame in network byte order.
175 enum ieee80211_radiotap_type {
176 IEEE80211_RADIOTAP_TSFT = 0,
177 IEEE80211_RADIOTAP_FLAGS = 1,
178 IEEE80211_RADIOTAP_RATE = 2,
179 IEEE80211_RADIOTAP_CHANNEL = 3,
180 IEEE80211_RADIOTAP_FHSS = 4,
181 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
182 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
183 IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
184 IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
185 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
186 IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
187 IEEE80211_RADIOTAP_ANTENNA = 11,
188 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
189 IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
190 IEEE80211_RADIOTAP_EXT = 31,
194 #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
195 #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
196 #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
197 #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
198 #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */
199 #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */
200 #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */
201 #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */
203 /* For IEEE80211_RADIOTAP_FLAGS */
204 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
207 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
211 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
212 * with WEP encryption
214 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
217 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
218 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
219 * 802.11 header and payload
220 * (to 32-bit boundary)
223 /* Ugly macro to convert literal channel numbers into their mhz equivalents
224 * There are certianly some conditions that will break this (like feeding it '30')
225 * but they shouldn't arise since nothing talks on channel 30. */
226 #define ieee80211chan2mhz(x) \
228 (((x) == 14) ? 2484 : ((x) * 5) + 2407) : \
231 #endif /* IEEE80211_RADIOTAP_H */