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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 | /* | |
34 | * Modifications to fit into the linux IEEE 802.11 stack, | |
35 | * Mike Kershaw (dragorn@kismetwireless.net) | |
36 | */ | |
37 | ||
38 | #ifndef IEEE80211RADIOTAP_H | |
39 | #define IEEE80211RADIOTAP_H | |
40 | ||
41 | #include <linux/if_ether.h> | |
42 | #include <linux/kernel.h> | |
43 | ||
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 | |
48 | ||
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. | |
52 | * | |
53 | * I suggest the following extensible radio capture format. It is | |
54 | * based on a bitmap indicating which fields are present. | |
55 | * | |
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 | |
61 | * readers. | |
62 | */ | |
63 | ||
64 | /* XXX tcpdump/libpcap do not tolerate variable-length headers, | |
65 | * yet, so we pad every radiotap header to 64 bytes. Ugh. | |
66 | */ | |
67 | #define IEEE80211_RADIOTAP_HDRLEN 64 | |
68 | ||
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. | |
75 | */ | |
76 | u8 it_pad; | |
77 | u16 it_len; /* length of the whole | |
78 | * header in bytes, including | |
79 | * it_version, it_pad, | |
80 | * it_len, and data fields. | |
81 | */ | |
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 | |
87 | * by setting bit 31. | |
88 | */ | |
89 | }; | |
90 | ||
91 | /* Name Data type Units | |
92 | * ---- --------- ----- | |
93 | * | |
94 | * IEEE80211_RADIOTAP_TSFT u64 microseconds | |
95 | * | |
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. | |
99 | * | |
100 | * IEEE80211_RADIOTAP_CHANNEL 2 x u16 MHz, bitmap | |
101 | * | |
102 | * Tx/Rx frequency in MHz, followed by flags (see below). | |
103 | * | |
104 | * IEEE80211_RADIOTAP_FHSS u16 see below | |
105 | * | |
106 | * For frequency-hopping radios, the hop set (first byte) | |
107 | * and pattern (second byte). | |
108 | * | |
109 | * IEEE80211_RADIOTAP_RATE u8 500kb/s | |
110 | * | |
111 | * Tx/Rx data rate | |
112 | * | |
113 | * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from | |
114 | * one milliwatt (dBm) | |
115 | * | |
116 | * RF signal power at the antenna, decibel difference from | |
117 | * one milliwatt. | |
118 | * | |
119 | * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from | |
120 | * one milliwatt (dBm) | |
121 | * | |
122 | * RF noise power at the antenna, decibel difference from one | |
123 | * milliwatt. | |
124 | * | |
125 | * IEEE80211_RADIOTAP_DB_ANTSIGNAL u8 decibel (dB) | |
126 | * | |
127 | * RF signal power at the antenna, decibel difference from an | |
128 | * arbitrary, fixed reference. | |
129 | * | |
130 | * IEEE80211_RADIOTAP_DB_ANTNOISE u8 decibel (dB) | |
131 | * | |
132 | * RF noise power at the antenna, decibel difference from an | |
133 | * arbitrary, fixed reference point. | |
134 | * | |
135 | * IEEE80211_RADIOTAP_LOCK_QUALITY u16 unitless | |
136 | * | |
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 | |
140 | * this?) | |
141 | * | |
142 | * IEEE80211_RADIOTAP_TX_ATTENUATION u16 unitless | |
143 | * | |
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. | |
147 | * | |
148 | * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u16 decibels (dB) | |
149 | * | |
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. | |
153 | * | |
154 | * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from | |
155 | * one milliwatt (dBm) | |
156 | * | |
157 | * Transmit power expressed as dBm (decibels from a 1 milliwatt | |
158 | * reference). This is the absolute power level measured at | |
159 | * the antenna port. | |
160 | * | |
161 | * IEEE80211_RADIOTAP_FLAGS u8 bitmap | |
162 | * | |
163 | * Properties of transmitted and received frames. See flags | |
164 | * defined below. | |
165 | * | |
166 | * IEEE80211_RADIOTAP_ANTENNA u8 antenna index | |
167 | * | |
168 | * Unitless indication of the Rx/Tx antenna for this packet. | |
169 | * The first antenna is antenna 0. | |
170 | * | |
171 | * IEEE80211_RADIOTAP_FCS u32 data | |
172 | * | |
173 | * FCS from frame in network byte order. | |
174 | */ | |
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, | |
191 | }; | |
192 | ||
193 | /* Channel flags. */ | |
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) */ | |
202 | ||
203 | /* For IEEE80211_RADIOTAP_FLAGS */ | |
204 | #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received | |
205 | * during CFP | |
206 | */ | |
207 | #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received | |
208 | * with short | |
209 | * preamble | |
210 | */ | |
211 | #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received | |
212 | * with WEP encryption | |
213 | */ | |
214 | #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received | |
215 | * with fragmentation | |
216 | */ | |
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) | |
221 | */ | |
222 | ||
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) \ | |
227 | (((x) <= 14) ? \ | |
228 | (((x) == 14) ? 2484 : ((x) * 5) + 2407) : \ | |
229 | ((x) + 1000) * 5) | |
230 | ||
231 | #endif /* IEEE80211_RADIOTAP_H */ |