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1 office 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 $ */
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 * 3. The name of David Young may not be used to endorse or promote
16 * products derived from this software without specific prior
17 * written permission.
18 *
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,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
25 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
27 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30 * OF SUCH DAMAGE.
31 */
32  
33 #ifndef RADIOTAP_H
34 #define RADIOTAP_H
35  
36 /* Kluge the radiotap linktype for now if we don't have it */
37 #ifndef LNX_ARPHRD_IEEE80211_RADIOTAP
38 #define LNX_ARPHRD_IEEE80211_RADIOTAP 803
39 #endif
40  
41 /* Radiotap header version (from official NetBSD feed) */
42 #define IEEE80211RADIOTAP_VERSION "1.5"
43 /* Base version of the radiotap packet header data */
44 #define PKTHDR_RADIOTAP_VERSION 0
45  
46 /* The radio capture header precedes the 802.11 header. */
47 struct ieee80211_radiotap_header {
48 u_int8_t it_version; /* Version 0. Only increases
49 * for drastic changes,
50 * introduction of compatible
51 * new fields does not count.
52 */
53 u_int8_t it_pad;
54 u_int16_t it_len; /* length of the whole
55 * header in bytes, including
56 * int_version, it_pad,
57 * it_len, and data fields.
58 */
59 u_int32_t it_present; /* A bitmap telling which
60 * fields are present. Set bit 31
61 * (0x80000000) to extend the
62 * bitmap by another 32 bits.
63 * Additional extensions are made
64 * by setting bit 31.
65 */
66 };
67  
68 /* Name Data type Units
69 * ---- --------- -----
70 *
71 * IEEE80211_RADIOTAP_TSFT u_int64_t microseconds
72 *
73 * Value in microseconds of the MAC's 64-bit 802.11 Time
74 * Synchronization Function timer when the first bit of the
75 * MPDU arrived at the MAC. For received frames, only.
76 *
77 * IEEE80211_RADIOTAP_CHANNEL 2 x u_int16_t MHz, bitmap
78 *
79 * Tx/Rx frequency in MHz, followed by flags (see below).
80 *
81 * IEEE80211_RADIOTAP_FHSS u_int16_t see below
82 *
83 * For frequency-hopping radios, the hop set (first byte)
84 * and pattern (second byte).
85 *
86 * IEEE80211_RADIOTAP_RATE u_int8_t 500kb/s
87 *
88 * Tx/Rx data rate
89 *
90 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from
91 * one milliwatt (dBm)
92 *
93 * RF signal power at the antenna, decibel difference from
94 * one milliwatt.
95 *
96 * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from
97 * one milliwatt (dBm)
98 *
99 * RF noise power at the antenna, decibel difference from one
100 * milliwatt.
101 *
102 * IEEE80211_RADIOTAP_DB_ANTSIGNAL u_int8_t decibel (dB)
103 *
104 * RF signal power at the antenna, decibel difference from an
105 * arbitrary, fixed reference.
106 *
107 * IEEE80211_RADIOTAP_DB_ANTNOISE u_int8_t decibel (dB)
108 *
109 * RF noise power at the antenna, decibel difference from an
110 * arbitrary, fixed reference point.
111 *
112 * IEEE80211_RADIOTAP_LOCK_QUALITY u_int16_t unitless
113 *
114 * Quality of Barker code lock. Unitless. Monotonically
115 * nondecreasing with "better" lock strength. Called "Signal
116 * Quality" in datasheets. (Is there a standard way to measure
117 * this?)
118 *
119 * IEEE80211_RADIOTAP_TX_ATTENUATION u_int16_t unitless
120 *
121 * Transmit power expressed as unitless distance from max
122 * power set at factory calibration. 0 is max power.
123 * Monotonically nondecreasing with lower power levels.
124 *
125 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t decibels (dB)
126 *
127 * Transmit power expressed as decibel distance from max power
128 * set at factory calibration. 0 is max power. Monotonically
129 * nondecreasing with lower power levels.
130 *
131 * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from
132 * one milliwatt (dBm)
133 *
134 * Transmit power expressed as dBm (decibels from a 1 milliwatt
135 * reference). This is the absolute power level measured at
136 * the antenna port.
137 *
138 * IEEE80211_RADIOTAP_FLAGS u_int8_t bitmap
139 *
140 * Properties of transmitted and received frames. See flags
141 * defined below.
142 *
143 * IEEE80211_RADIOTAP_ANTENNA u_int8_t antenna index
144 *
145 * Unitless indication of the Rx/Tx antenna for this packet.
146 * The first antenna is antenna 0.
147 *
148 * IEEE80211_RADIOTAP_FCS u_int32_t data
149 *
150 * FCS from frame in network byte order.
151 */
152 enum ieee80211_radiotap_type {
153 IEEE80211_RADIOTAP_TSFT = 0,
154 IEEE80211_RADIOTAP_FLAGS = 1,
155 IEEE80211_RADIOTAP_RATE = 2,
156 IEEE80211_RADIOTAP_CHANNEL = 3,
157 IEEE80211_RADIOTAP_FHSS = 4,
158 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
159 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
160 IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
161 IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
162 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
163 IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
164 IEEE80211_RADIOTAP_ANTENNA = 11,
165 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
166 IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
167 IEEE80211_RADIOTAP_FCS = 14,
168 IEEE80211_RADIOTAP_EXT = 31,
169 };
170  
171 /* Channel flags. */
172 #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
173 #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
174 #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
175 #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
176 #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */
177 #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */
178 #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */
179 #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */
180  
181 /* For IEEE80211_RADIOTAP_FLAGS */
182 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
183 * during CFP
184 */
185 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
186 * with short
187 * preamble
188 */
189 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
190 * with WEP encryption
191 */
192 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
193 * with fragmentation
194 */
195 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
196 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
197 * 802.11 header and payload
198 * (to 32-bit boundary)
199 */
200  
201 /* Ugly macro to convert literal channel numbers into their mhz equivalents
202 * There are certianly some conditions that will break this (like feeding it '30')
203 * but they shouldn't arise since nothing talks on channel 30. */
204 #define ieee80211chan2mhz(x) \
205 (((x) <= 14) ? \
206 (((x) == 14) ? 2484 : ((x) * 5) + 2407) : \
207 ((x) + 1000) * 5)
208  
209 #endif /* RADIOTAP_H */
210