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1 | /* |
2 | * Copyright (c) 2003, 2004 David Young. All rights reserved. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions |
6 | * are met: |
7 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * 3. The name of David Young may not be used to endorse or promote |
13 | * products derived from this software without specific prior |
14 | * written permission. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY |
17 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
18 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
19 | * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID |
20 | * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
21 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
22 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
24 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
25 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
27 | * OF SUCH DAMAGE. |
28 | */ |
29 | |
30 | /* |
31 | * Modifications to fit into the linux IEEE 802.11 stack, |
32 | * Mike Kershaw (dragorn@kismetwireless.net) |
33 | */ |
34 | |
35 | #ifndef IEEE80211RADIOTAP_H |
36 | #define IEEE80211RADIOTAP_H |
37 | |
38 | #include <linux/if_ether.h> |
39 | #include <linux/kernel.h> |
40 | #include <asm/unaligned.h> |
41 | |
42 | /* Base version of the radiotap packet header data */ |
43 | #define PKTHDR_RADIOTAP_VERSION 0 |
44 | |
45 | /* A generic radio capture format is desirable. There is one for |
46 | * Linux, but it is neither rigidly defined (there were not even |
47 | * units given for some fields) nor easily extensible. |
48 | * |
49 | * I suggest the following extensible radio capture format. It is |
50 | * based on a bitmap indicating which fields are present. |
51 | * |
52 | * I am trying to describe precisely what the application programmer |
53 | * should expect in the following, and for that reason I tell the |
54 | * units and origin of each measurement (where it applies), or else I |
55 | * use sufficiently weaselly language ("is a monotonically nondecreasing |
56 | * function of...") that I cannot set false expectations for lawyerly |
57 | * readers. |
58 | */ |
59 | |
60 | /* |
61 | * The radio capture header precedes the 802.11 header. |
62 | * All data in the header is little endian on all platforms. |
63 | */ |
64 | struct ieee80211_radiotap_header { |
65 | u8 it_version; /* Version 0. Only increases |
66 | * for drastic changes, |
67 | * introduction of compatible |
68 | * new fields does not count. |
69 | */ |
70 | u8 it_pad; |
71 | __le16 it_len; /* length of the whole |
72 | * header in bytes, including |
73 | * it_version, it_pad, |
74 | * it_len, and data fields. |
75 | */ |
76 | __le32 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 |
81 | * by setting bit 31. |
82 | */ |
83 | } __packed; |
84 | |
85 | /* Name Data type Units |
86 | * ---- --------- ----- |
87 | * |
88 | * IEEE80211_RADIOTAP_TSFT __le64 microseconds |
89 | * |
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. |
93 | * |
94 | * IEEE80211_RADIOTAP_CHANNEL 2 x __le16 MHz, bitmap |
95 | * |
96 | * Tx/Rx frequency in MHz, followed by flags (see below). |
97 | * |
98 | * IEEE80211_RADIOTAP_FHSS __le16 see below |
99 | * |
100 | * For frequency-hopping radios, the hop set (first byte) |
101 | * and pattern (second byte). |
102 | * |
103 | * IEEE80211_RADIOTAP_RATE u8 500kb/s |
104 | * |
105 | * Tx/Rx data rate |
106 | * |
107 | * IEEE80211_RADIOTAP_DBM_ANTSIGNAL s8 decibels from |
108 | * one milliwatt (dBm) |
109 | * |
110 | * RF signal power at the antenna, decibel difference from |
111 | * one milliwatt. |
112 | * |
113 | * IEEE80211_RADIOTAP_DBM_ANTNOISE s8 decibels from |
114 | * one milliwatt (dBm) |
115 | * |
116 | * RF noise power at the antenna, decibel difference from one |
117 | * milliwatt. |
118 | * |
119 | * IEEE80211_RADIOTAP_DB_ANTSIGNAL u8 decibel (dB) |
120 | * |
121 | * RF signal power at the antenna, decibel difference from an |
122 | * arbitrary, fixed reference. |
123 | * |
124 | * IEEE80211_RADIOTAP_DB_ANTNOISE u8 decibel (dB) |
125 | * |
126 | * RF noise power at the antenna, decibel difference from an |
127 | * arbitrary, fixed reference point. |
128 | * |
129 | * IEEE80211_RADIOTAP_LOCK_QUALITY __le16 unitless |
130 | * |
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 |
134 | * this?) |
135 | * |
136 | * IEEE80211_RADIOTAP_TX_ATTENUATION __le16 unitless |
137 | * |
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. |
141 | * |
142 | * IEEE80211_RADIOTAP_DB_TX_ATTENUATION __le16 decibels (dB) |
143 | * |
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. |
147 | * |
148 | * IEEE80211_RADIOTAP_DBM_TX_POWER s8 decibels from |
149 | * one milliwatt (dBm) |
150 | * |
151 | * Transmit power expressed as dBm (decibels from a 1 milliwatt |
152 | * reference). This is the absolute power level measured at |
153 | * the antenna port. |
154 | * |
155 | * IEEE80211_RADIOTAP_FLAGS u8 bitmap |
156 | * |
157 | * Properties of transmitted and received frames. See flags |
158 | * defined below. |
159 | * |
160 | * IEEE80211_RADIOTAP_ANTENNA u8 antenna index |
161 | * |
162 | * Unitless indication of the Rx/Tx antenna for this packet. |
163 | * The first antenna is antenna 0. |
164 | * |
165 | * IEEE80211_RADIOTAP_RX_FLAGS __le16 bitmap |
166 | * |
167 | * Properties of received frames. See flags defined below. |
168 | * |
169 | * IEEE80211_RADIOTAP_TX_FLAGS __le16 bitmap |
170 | * |
171 | * Properties of transmitted frames. See flags defined below. |
172 | * |
173 | * IEEE80211_RADIOTAP_RTS_RETRIES u8 data |
174 | * |
175 | * Number of rts retries a transmitted frame used. |
176 | * |
177 | * IEEE80211_RADIOTAP_DATA_RETRIES u8 data |
178 | * |
179 | * Number of unicast retries a transmitted frame used. |
180 | * |
181 | */ |
182 | enum ieee80211_radiotap_type { |
183 | IEEE80211_RADIOTAP_TSFT = 0, |
184 | IEEE80211_RADIOTAP_FLAGS = 1, |
185 | IEEE80211_RADIOTAP_RATE = 2, |
186 | IEEE80211_RADIOTAP_CHANNEL = 3, |
187 | IEEE80211_RADIOTAP_FHSS = 4, |
188 | IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5, |
189 | IEEE80211_RADIOTAP_DBM_ANTNOISE = 6, |
190 | IEEE80211_RADIOTAP_LOCK_QUALITY = 7, |
191 | IEEE80211_RADIOTAP_TX_ATTENUATION = 8, |
192 | IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9, |
193 | IEEE80211_RADIOTAP_DBM_TX_POWER = 10, |
194 | IEEE80211_RADIOTAP_ANTENNA = 11, |
195 | IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12, |
196 | IEEE80211_RADIOTAP_DB_ANTNOISE = 13, |
197 | IEEE80211_RADIOTAP_RX_FLAGS = 14, |
198 | IEEE80211_RADIOTAP_TX_FLAGS = 15, |
199 | IEEE80211_RADIOTAP_RTS_RETRIES = 16, |
200 | IEEE80211_RADIOTAP_DATA_RETRIES = 17, |
201 | |
202 | /* valid in every it_present bitmap, even vendor namespaces */ |
203 | IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29, |
204 | IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30, |
205 | IEEE80211_RADIOTAP_EXT = 31 |
206 | }; |
207 | |
208 | /* Channel flags. */ |
209 | #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */ |
210 | #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */ |
211 | #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */ |
212 | #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */ |
213 | #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */ |
214 | #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */ |
215 | #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */ |
216 | #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */ |
217 | |
218 | /* For IEEE80211_RADIOTAP_FLAGS */ |
219 | #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received |
220 | * during CFP |
221 | */ |
222 | #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received |
223 | * with short |
224 | * preamble |
225 | */ |
226 | #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received |
227 | * with WEP encryption |
228 | */ |
229 | #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received |
230 | * with fragmentation |
231 | */ |
232 | #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */ |
233 | #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between |
234 | * 802.11 header and payload |
235 | * (to 32-bit boundary) |
236 | */ |
237 | #define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* bad FCS */ |
238 | |
239 | /* For IEEE80211_RADIOTAP_RX_FLAGS */ |
240 | #define IEEE80211_RADIOTAP_F_RX_BADPLCP 0x0002 /* frame has bad PLCP */ |
241 | |
242 | /* For IEEE80211_RADIOTAP_TX_FLAGS */ |
243 | #define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive |
244 | * retries */ |
245 | #define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */ |
246 | #define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */ |
247 | |
248 | /* Ugly macro to convert literal channel numbers into their mhz equivalents |
249 | * There are certianly some conditions that will break this (like feeding it '30') |
250 | * but they shouldn't arise since nothing talks on channel 30. */ |
251 | #define ieee80211chan2mhz(x) \ |
252 | (((x) <= 14) ? \ |
253 | (((x) == 14) ? 2484 : ((x) * 5) + 2407) : \ |
254 | ((x) + 1000) * 5) |
255 | |
256 | /* helpers */ |
257 | static inline int ieee80211_get_radiotap_len(unsigned char *data) |
258 | { |
259 | struct ieee80211_radiotap_header *hdr = |
260 | (struct ieee80211_radiotap_header *)data; |
261 | |
262 | return get_unaligned_le16(&hdr->it_len); |
263 | } |
264 | |
265 | #endif /* IEEE80211_RADIOTAP_H */ |
266 |
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