1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/* $FreeBSD$ */
/* $NetBSD: ieee802_11_radio.h,v 1.2 2006/02/26 03:04:03 dyoung Exp $ */
/* $Header: /tcpdump/master/tcpdump/ieee802_11_radio.h,v 1.3 2007-08-29 02:31:44 mcr Exp $ */
/*-
* Copyright (c) 2003, 2004 David Young. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of David Young may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
* YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#ifndef _NET_IF_IEEE80211RADIOTAP_H_
#define _NET_IF_IEEE80211RADIOTAP_H_
/* A generic radio capture format is desirable. There is one for
* Linux, but it is neither rigidly defined (there were not even
* units given for some fields) nor easily extensible.
*
* I suggest the following extensible radio capture format. It is
* based on a bitmap indicating which fields are present.
*
* I am trying to describe precisely what the application programmer
* should expect in the following, and for that reason I tell the
* units and origin of each measurement (where it applies), or else I
* use sufficiently weaselly language ("is a monotonically nondecreasing
* function of...") that I cannot set false expectations for lawyerly
* readers.
*/
#if defined(__KERNEL__) || defined(_KERNEL)
#ifndef DLT_IEEE802_11_RADIO
#define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */
#endif
#endif /* defined(__KERNEL__) || defined(_KERNEL) */
/*
* The radio capture header precedes the 802.11 header.
*
* Note well: all radiotap fields are little-endian.
*/
struct ieee80211_radiotap_header {
u_int8_t it_version; /* Version 0. Only increases
* for drastic changes,
* introduction of compatible
* new fields does not count.
*/
u_int8_t it_pad;
u_int16_t it_len; /* length of the whole
* header in bytes, including
* it_version, it_pad,
* it_len, and data fields.
*/
u_int32_t it_present; /* A bitmap telling which
* fields are present. Set bit 31
* (0x80000000) to extend the
* bitmap by another 32 bits.
* Additional extensions are made
* by setting bit 31.
*/
} __attribute__((__packed__));
/* Name Data type Units
* ---- --------- -----
*
* IEEE80211_RADIOTAP_TSFT u_int64_t microseconds
*
* Value in microseconds of the MAC's 64-bit 802.11 Time
* Synchronization Function timer when the first bit of the
* MPDU arrived at the MAC. For received frames, only.
*
* IEEE80211_RADIOTAP_CHANNEL 2 x u_int16_t MHz, bitmap
*
* Tx/Rx frequency in MHz, followed by flags (see below).
* Note that IEEE80211_RADIOTAP_XCHANNEL must be used to
* represent an HT channel as there is not enough room in
* the flags word.
*
* IEEE80211_RADIOTAP_FHSS u_int16_t see below
*
* For frequency-hopping radios, the hop set (first byte)
* and pattern (second byte).
*
* IEEE80211_RADIOTAP_RATE u_int8_t 500kb/s or index
*
* Tx/Rx data rate. If bit 0x80 is set then it represents an
* an MCS index and not an IEEE rate.
*
* IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from
* one milliwatt (dBm)
*
* RF signal power at the antenna, decibel difference from
* one milliwatt.
*
* IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from
* one milliwatt (dBm)
*
* RF noise power at the antenna, decibel difference from one
* milliwatt.
*
* IEEE80211_RADIOTAP_DB_ANTSIGNAL u_int8_t decibel (dB)
*
* RF signal power at the antenna, decibel difference from an
* arbitrary, fixed reference.
*
* IEEE80211_RADIOTAP_DB_ANTNOISE u_int8_t decibel (dB)
*
* RF noise power at the antenna, decibel difference from an
* arbitrary, fixed reference point.
*
* IEEE80211_RADIOTAP_LOCK_QUALITY u_int16_t unitless
*
* Quality of Barker code lock. Unitless. Monotonically
* nondecreasing with "better" lock strength. Called "Signal
* Quality" in datasheets. (Is there a standard way to measure
* this?)
*
* IEEE80211_RADIOTAP_TX_ATTENUATION u_int16_t unitless
*
* Transmit power expressed as unitless distance from max
* power set at factory calibration. 0 is max power.
* Monotonically nondecreasing with lower power levels.
*
* IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t decibels (dB)
*
* Transmit power expressed as decibel distance from max power
* set at factory calibration. 0 is max power. Monotonically
* nondecreasing with lower power levels.
*
* IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from
* one milliwatt (dBm)
*
* Transmit power expressed as dBm (decibels from a 1 milliwatt
* reference). This is the absolute power level measured at
* the antenna port.
*
* IEEE80211_RADIOTAP_FLAGS u_int8_t bitmap
*
* Properties of transmitted and received frames. See flags
* defined below.
*
* IEEE80211_RADIOTAP_ANTENNA u_int8_t antenna index
*
* Unitless indication of the Rx/Tx antenna for this packet.
* The first antenna is antenna 0.
*
* IEEE80211_RADIOTAP_XCHANNEL u_int32_t bitmap
* u_int16_t MHz
* u_int8_t channel number
* u_int8_t .5 dBm
*
* Extended channel specification: flags (see below) followed by
* frequency in MHz, the corresponding IEEE channel number, and
* finally the maximum regulatory transmit power cap in .5 dBm
* units. This property supersedes IEEE80211_RADIOTAP_CHANNEL
* and only one of the two should be present.
*
* IEEE80211_RADIOTAP_FCS u_int32_t data
*
* FCS from frame in network byte order.
*/
enum ieee80211_radiotap_type {
IEEE80211_RADIOTAP_TSFT = 0,
IEEE80211_RADIOTAP_FLAGS = 1,
IEEE80211_RADIOTAP_RATE = 2,
IEEE80211_RADIOTAP_CHANNEL = 3,
IEEE80211_RADIOTAP_FHSS = 4,
IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
IEEE80211_RADIOTAP_ANTENNA = 11,
IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
IEEE80211_RADIOTAP_XCHANNEL = 14,
IEEE80211_RADIOTAP_EXT = 31
};
#ifndef _KERNEL
/* Channel flags; some are used only with XCHANNEL */
#define IEEE80211_CHAN_TURBO 0x00010 /* Turbo channel */
#define IEEE80211_CHAN_CCK 0x00020 /* CCK channel */
#define IEEE80211_CHAN_OFDM 0x00040 /* OFDM channel */
#define IEEE80211_CHAN_2GHZ 0x00080 /* 2 GHz spectrum channel. */
#define IEEE80211_CHAN_5GHZ 0x00100 /* 5 GHz spectrum channel */
#define IEEE80211_CHAN_PASSIVE 0x00200 /* Only passive scan allowed */
#define IEEE80211_CHAN_DYN 0x00400 /* Dynamic CCK-OFDM channel */
#define IEEE80211_CHAN_GFSK 0x00800 /* GFSK channel (FHSS PHY) */
#define IEEE80211_CHAN_GSM 0x01000 /* 900 MHz spectrum channel */
#define IEEE80211_CHAN_STURBO 0x02000 /* 11a static turbo channel only */
#define IEEE80211_CHAN_HALF 0x04000 /* Half rate channel */
#define IEEE80211_CHAN_QUARTER 0x08000 /* Quarter rate channel */
#define IEEE80211_CHAN_HT20 0x10000 /* HT 20 channel */
#define IEEE80211_CHAN_HT40U 0x20000 /* HT 40 channel w/ ext above */
#define IEEE80211_CHAN_HT40D 0x40000 /* HT 40 channel w/ ext below */
#endif /* !_KERNEL */
/* For IEEE80211_RADIOTAP_FLAGS */
#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
* during CFP
*/
#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
* with short
* preamble
*/
#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
* with WEP encryption
*/
#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
* with fragmentation
*/
#define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
#define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
* 802.11 header and payload
* (to 32-bit boundary)
*/
#define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* does not pass FCS check */
#endif /* _NET_IF_IEEE80211RADIOTAP_H_ */
|
