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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 /* Copyright 2013 Simson L. Garfinkel
31 * Cleaned up.
32 */
33
34 #ifndef _NET_IF_IEEE80211RADIOTAP_H_
35 #define _NET_IF_IEEE80211RADIOTAP_H_
36
37 #include "os.h"
38
39 /* A generic radio capture format is desirable. There is one for
40 * Linux, but it is neither rigidly defined (there were not even
41 * units given for some fields) nor easily extensible.
42 *
43 * I suggest the following extensible radio capture format. It is
44 * based on a bitmap indicating which fields are present.
45 *
46 * I am trying to describe precisely what the application programmer
47 * should expect in the following, and for that reason I tell the
48 * units and origin of each measurement (where it applies), or else I
49 * use sufficiently weaselly language ("is a monotonically nondecreasing
50 * function of...") that I cannot set false expectations for lawyerly
51 * readers.
52 */
53 #ifndef DLT_IEEE802_11_RADIO
54 #define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */
55 #endif
56
57 #ifdef _WIN32
58 #pragma pack(push, 1)
59 #endif
60 /* The radio capture header precedes the 802.11 header. */
61 struct ieee80211_radiotap_header {
62 u_int8_t it_version; /* Version 0. Only increases
63 * for drastic changes,
64 * introduction of compatible
65 * new fields does not count.
66 */
67 u_int8_t it_pad;
68 u_int16_t it_len; /* length of the whole
69 * header in bytes, including
70 * it_version, it_pad,
71 * it_len, and data fields.
72 */
73 u_int32_t it_present; /* A bitmap telling which
74 * fields are present. Set bit 31
75 * (0x80000000) to extend the
76 * bitmap by another 32 bits.
77 * Additional extensions are made
78 * by setting bit 31.
79 */
80 } _PACKED_;
81 #ifdef _WIN32
82 #pragma pack(pop)
83 #endif
84
85 /* Name Data type Units
86 * ---- --------- -----
87 *
88 * IEEE80211_RADIOTAP_TSFT u_int64_t 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 u_int16_t MHz, bitmap
95 *
96 * Tx/Rx frequency in MHz, followed by flags (see below).
97 *
98 * IEEE80211_RADIOTAP_FHSS u_int16_t see below
99 *
100 * For frequency-hopping radios, the hop set (first byte)
101 * and pattern (second byte).
102 *
103 * IEEE80211_RADIOTAP_RATE u_int8_t 500kb/s
104 *
105 * Tx/Rx data rate
106 *
107 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t 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 int8_t 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 u_int8_t decibel (dB)
120 *
121 * RF signal power at the antenna, decibel difference from an
122 * arbitrary, fixed reference.
123 *
124 * IEEE80211_RADIOTAP_DB_ANTNOISE u_int8_t 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 u_int16_t 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 u_int16_t 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 u_int16_t 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 int8_t 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 u_int8_t bitmap
156 *
157 * Properties of transmitted and received frames. See flags
158 * defined below.
159 *
160 * IEEE80211_RADIOTAP_ANTENNA u_int8_t 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_FCS u_int32_t data
166 *
167 * FCS from frame in network byte order.
168 */
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_RX_FLAGS = 14,
185 IEEE80211_RADIOTAP_TX_FLAGS = 15,
186 IEEE80211_RADIOTAP_RTS_RETRIES = 16,
187 IEEE80211_RADIOTAP_DATA_RETRIES = 17,
188 IEEE80211_RADIOTAP_XCHANNEL = 18, /* Unofficial, used by FreeBSD */
189 IEEE80211_RADIOTAP_MCS = 19,
190 IEEE80211_RADIOTAP_AMPDU_STATUS = 20,
191 /* valid in every it_present bitmap, even vendor namespaces */
192 IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
193 IEEE80211_RADIOTAP_EXT = 31
194 };
195
196 /* Channel flags. */
197 #define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
198 #define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
199 #define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
200 #define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
201 #define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */
202 #define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */
203 #define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */
204 #define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */
205
206 /* For IEEE80211_RADIOTAP_FLAGS */
207 #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
208 * during CFP
209 */
210 #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
211 * with short
212 * preamble
213 */
214 #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
215 * with WEP encryption
216 */
217 #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
218 * with fragmentation
219 */
220 #define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
221 #define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
222 * 802.11 header and payload
223 * (to 32-bit boundary)
224 */
225 #define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */
226
227 /* For IEEE80211_RADIOTAP_RX_FLAGS */
228 #define IEEE80211_RADIOTAP_F_RX_BADPLCP 0x0002 /* bad PLCP */
229
230 /* For IEEE80211_RADIOTAP_TX_FLAGS */
231 #define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive
232 * retries */
233 #define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */
234 #define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */
235
236 /* For IEEE80211_RADIOTAP_AMPDU_STATUS */
237 #define IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN 0x0001
238 #define IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN 0x0002
239 #define IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN 0x0004
240 #define IEEE80211_RADIOTAP_AMPDU_IS_LAST 0x0008
241 #define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR 0x0010
242 #define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN 0x0020
243
244
245 /* For IEEE80211_RADIOTAP_MCS */
246 #define IEEE80211_RADIOTAP_MCS_HAVE_BW 0x01
247 #define IEEE80211_RADIOTAP_MCS_HAVE_MCS 0x02
248 #define IEEE80211_RADIOTAP_MCS_HAVE_GI 0x04
249 #define IEEE80211_RADIOTAP_MCS_HAVE_FMT 0x08
250 #define IEEE80211_RADIOTAP_MCS_HAVE_FEC 0x10
251
252 #define IEEE80211_RADIOTAP_MCS_BW_MASK 0x03
253 #define IEEE80211_RADIOTAP_MCS_BW_20 0
254 #define IEEE80211_RADIOTAP_MCS_BW_40 1
255 #define IEEE80211_RADIOTAP_MCS_BW_20L 2
256 #define IEEE80211_RADIOTAP_MCS_BW_20U 3
257 #define IEEE80211_RADIOTAP_MCS_SGI 0x04
258 #define IEEE80211_RADIOTAP_MCS_FMT_GF 0x08
259 #define IEEE80211_RADIOTAP_MCS_FEC_LDPC 0x10
260
261
262 #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */