1 /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5.2.1 2006/01/29 07:13:58 sam Exp $ */
2 /* $NetBSD: ieee80211_radiotap.h,v 1.10 2005/01/04 00:34:58 dyoung Exp $ */
3 /* $DragonFly: src/sys/netproto/802_11/ieee80211_radiotap.h,v 1.2 2006/05/18 13:51:46 sephe Exp $ */
6 * Copyright (c) 2003, 2004 David Young. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of David Young may not be used to endorse or promote
17 * products derived from this software without specific prior
20 * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
21 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
23 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
24 * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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26 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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33 #ifndef _NET_IF_IEEE80211RADIOTAP_H_
34 #define _NET_IF_IEEE80211RADIOTAP_H_
37 * A generic radio capture format is desirable. There is one for
38 * Linux, but it is neither rigidly defined (there were not even
39 * units given for some fields) nor easily extensible.
41 * I suggest the following extensible radio capture format. It is
42 * based on a bitmap indicating which fields are present.
44 * I am trying to describe precisely what the application programmer
45 * should expect in the following, and for that reason I tell the
46 * units and origin of each measurement (where it applies), or else I
47 * use sufficiently weaselly language ("is a monotonically nondecreasing
48 * function of...") that I cannot set false expectations for lawyerly
51 #if defined(__KERNEL__) || defined(_KERNEL)
52 #ifndef DLT_IEEE802_11_RADIO
53 #define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */
55 #endif /* defined(__KERNEL__) || defined(_KERNEL) */
58 * XXX tcpdump/libpcap do not tolerate variable-length headers,
59 * yet, so we pad every radiotap header to 64 bytes. Ugh.
61 #define IEEE80211_RADIOTAP_HDRLEN 64
63 /* The radio capture header precedes the 802.11 header. */
64 struct ieee80211_radiotap_header {
65 uint8_t it_version; /* Version 0. Only increases
66 * for drastic changes,
67 * introduction of compatible
68 * new fields does not count.
71 uint16_t it_len; /* length of the whole
72 * header in bytes, including
74 * it_len, and data fields.
76 uint32_t 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
85 /* Name Data type Units
86 * ---- --------- -----
88 * IEEE80211_RADIOTAP_TSFT uint64_t microseconds
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.
94 * IEEE80211_RADIOTAP_CHANNEL 2 x uint16_t MHz, bitmap
96 * Tx/Rx frequency in MHz, followed by flags (see below).
98 * IEEE80211_RADIOTAP_FHSS uint16_t see below
100 * For frequency-hopping radios, the hop set (first byte)
101 * and pattern (second byte).
103 * IEEE80211_RADIOTAP_RATE uint8_t 500kb/s
107 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from
108 * one milliwatt (dBm)
110 * RF signal power at the antenna, decibel difference from
113 * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from
114 * one milliwatt (dBm)
116 * RF noise power at the antenna, decibel difference from one
119 * IEEE80211_RADIOTAP_DB_ANTSIGNAL uint8_t decibel (dB)
121 * RF signal power at the antenna, decibel difference from an
122 * arbitrary, fixed reference.
124 * IEEE80211_RADIOTAP_DB_ANTNOISE uint8_t decibel (dB)
126 * RF noise power at the antenna, decibel difference from an
127 * arbitrary, fixed reference point.
129 * IEEE80211_RADIOTAP_LOCK_QUALITY uint16_t unitless
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
136 * IEEE80211_RADIOTAP_TX_ATTENUATION uint16_t unitless
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.
142 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t decibels (dB)
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.
148 * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from
149 * one milliwatt (dBm)
151 * Transmit power expressed as dBm (decibels from a 1 milliwatt
152 * reference). This is the absolute power level measured at
155 * IEEE80211_RADIOTAP_FLAGS uint8_t bitmap
157 * Properties of transmitted and received frames. See flags
160 * IEEE80211_RADIOTAP_ANTENNA uint8_t antenna index
162 * Unitless indication of the Rx/Tx antenna for this packet.
163 * The first antenna is antenna 0.
165 * IEEE80211_RADIOTAP_FCS uint32_t data
167 * FCS from frame in network byte order.
169 enum ieee80211_radiotap_type {
170 IEEE80211_RADIOTAP_TSFT = 0,
171 IEEE80211_RADIOTAP_FLAGS = 1,
172 IEEE80211_RADIOTAP_RATE = 2,
173 IEEE80211_RADIOTAP_CHANNEL = 3,
174 IEEE80211_RADIOTAP_FHSS = 4,
175 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
176 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
177 IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
178 IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
179 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
180 IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
181 IEEE80211_RADIOTAP_ANTENNA = 11,
182 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
183 IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
184 IEEE80211_RADIOTAP_EXT = 31,
189 #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
190 #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
191 #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
192 #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
193 #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */
194 #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */
195 #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */
196 #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */
197 #endif /* !_KERNEL */
199 /* For IEEE80211_RADIOTAP_FLAGS */
200 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
203 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
207 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
208 * with WEP encryption
210 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
213 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
214 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
215 * 802.11 header and payload
216 * (to 32-bit boundary)
218 #define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */
220 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */