radiotap.h revision 7dba0e5708da7276a43a44cf479aa743564e15b9 
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 <stdint.h>
39
40/* Base version of the radiotap packet header data */
41#define PKTHDR_RADIOTAP_VERSION		0
42
43/* A generic radio capture format is desirable. There is one for
44 * Linux, but it is neither rigidly defined (there were not even
45 * units given for some fields) nor easily extensible.
46 *
47 * I suggest the following extensible radio capture format. It is
48 * based on a bitmap indicating which fields are present.
49 *
50 * I am trying to describe precisely what the application programmer
51 * should expect in the following, and for that reason I tell the
52 * units and origin of each measurement (where it applies), or else I
53 * use sufficiently weaselly language ("is a monotonically nondecreasing
54 * function of...") that I cannot set false expectations for lawyerly
55 * readers.
56 */
57
58/* The radio capture header precedes the 802.11 header.
59 * All data in the header is little endian on all platforms.
60 */
61struct ieee80211_radiotap_header {
62	uint8_t it_version;	/* Version 0. Only increases
63				 * for drastic changes,
64				 * introduction of compatible
65				 * new fields does not count.
66				 */
67	uint8_t it_pad;
68	uint16_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	uint32_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};
81
82/* Name                                 Data type    Units
83 * ----                                 ---------    -----
84 *
85 * IEEE80211_RADIOTAP_TSFT              __le64       microseconds
86 *
87 *      Value in microseconds of the MAC's 64-bit 802.11 Time
88 *      Synchronization Function timer when the first bit of the
89 *      MPDU arrived at the MAC. For received frames, only.
90 *
91 * IEEE80211_RADIOTAP_CHANNEL           2 x uint16_t   MHz, bitmap
92 *
93 *      Tx/Rx frequency in MHz, followed by flags (see below).
94 *
95 * IEEE80211_RADIOTAP_FHSS              uint16_t       see below
96 *
97 *      For frequency-hopping radios, the hop set (first byte)
98 *      and pattern (second byte).
99 *
100 * IEEE80211_RADIOTAP_RATE              u8           500kb/s
101 *
102 *      Tx/Rx data rate
103 *
104 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL     s8           decibels from
105 *                                                   one milliwatt (dBm)
106 *
107 *      RF signal power at the antenna, decibel difference from
108 *      one milliwatt.
109 *
110 * IEEE80211_RADIOTAP_DBM_ANTNOISE      s8           decibels from
111 *                                                   one milliwatt (dBm)
112 *
113 *      RF noise power at the antenna, decibel difference from one
114 *      milliwatt.
115 *
116 * IEEE80211_RADIOTAP_DB_ANTSIGNAL      u8           decibel (dB)
117 *
118 *      RF signal power at the antenna, decibel difference from an
119 *      arbitrary, fixed reference.
120 *
121 * IEEE80211_RADIOTAP_DB_ANTNOISE       u8           decibel (dB)
122 *
123 *      RF noise power at the antenna, decibel difference from an
124 *      arbitrary, fixed reference point.
125 *
126 * IEEE80211_RADIOTAP_LOCK_QUALITY      uint16_t       unitless
127 *
128 *      Quality of Barker code lock. Unitless. Monotonically
129 *      nondecreasing with "better" lock strength. Called "Signal
130 *      Quality" in datasheets.  (Is there a standard way to measure
131 *      this?)
132 *
133 * IEEE80211_RADIOTAP_TX_ATTENUATION    uint16_t       unitless
134 *
135 *      Transmit power expressed as unitless distance from max
136 *      power set at factory calibration.  0 is max power.
137 *      Monotonically nondecreasing with lower power levels.
138 *
139 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION uint16_t       decibels (dB)
140 *
141 *      Transmit power expressed as decibel distance from max power
142 *      set at factory calibration.  0 is max power.  Monotonically
143 *      nondecreasing with lower power levels.
144 *
145 * IEEE80211_RADIOTAP_DBM_TX_POWER      s8           decibels from
146 *                                                   one milliwatt (dBm)
147 *
148 *      Transmit power expressed as dBm (decibels from a 1 milliwatt
149 *      reference). This is the absolute power level measured at
150 *      the antenna port.
151 *
152 * IEEE80211_RADIOTAP_FLAGS             u8           bitmap
153 *
154 *      Properties of transmitted and received frames. See flags
155 *      defined below.
156 *
157 * IEEE80211_RADIOTAP_ANTENNA           u8           antenna index
158 *
159 *      Unitless indication of the Rx/Tx antenna for this packet.
160 *      The first antenna is antenna 0.
161 *
162 * IEEE80211_RADIOTAP_RX_FLAGS          uint16_t       bitmap
163 *
164 *     Properties of received frames. See flags defined below.
165 *
166 * IEEE80211_RADIOTAP_TX_FLAGS          uint16_t       bitmap
167 *
168 *     Properties of transmitted frames. See flags defined below.
169 *
170 * IEEE80211_RADIOTAP_RTS_RETRIES       u8           data
171 *
172 *     Number of rts retries a transmitted frame used.
173 *
174 * IEEE80211_RADIOTAP_DATA_RETRIES      u8           data
175 *
176 *     Number of unicast retries a transmitted frame used.
177 *
178 * IEEE80211_RADIOTAP_MCS	u8, u8, u8		unitless
179 *
180 *     Contains a bitmap of known fields/flags, the flags, and
181 *     the MCS index.
182 *
183 * IEEE80211_RADIOTAP_AMPDU_STATUS	u32, u16, u8, u8	unitlesss
184 *
185 *	Contains the AMPDU information for the subframe.
186 */
187enum ieee80211_radiotap_type {
188	IEEE80211_RADIOTAP_TSFT = 0,
189	IEEE80211_RADIOTAP_FLAGS = 1,
190	IEEE80211_RADIOTAP_RATE = 2,
191	IEEE80211_RADIOTAP_CHANNEL = 3,
192	IEEE80211_RADIOTAP_FHSS = 4,
193	IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
194	IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
195	IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
196	IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
197	IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
198	IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
199	IEEE80211_RADIOTAP_ANTENNA = 11,
200	IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
201	IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
202	IEEE80211_RADIOTAP_RX_FLAGS = 14,
203	IEEE80211_RADIOTAP_TX_FLAGS = 15,
204	IEEE80211_RADIOTAP_RTS_RETRIES = 16,
205	IEEE80211_RADIOTAP_DATA_RETRIES = 17,
206
207	IEEE80211_RADIOTAP_MCS = 19,
208	IEEE80211_RADIOTAP_AMPDU_STATUS = 20,
209
210	/* valid in every it_present bitmap, even vendor namespaces */
211	IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
212	IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30,
213	IEEE80211_RADIOTAP_EXT = 31
214};
215
216/* Channel flags. */
217#define	IEEE80211_CHAN_TURBO	0x0010	/* Turbo channel */
218#define	IEEE80211_CHAN_CCK	0x0020	/* CCK channel */
219#define	IEEE80211_CHAN_OFDM	0x0040	/* OFDM channel */
220#define	IEEE80211_CHAN_2GHZ	0x0080	/* 2 GHz spectrum channel. */
221#define	IEEE80211_CHAN_5GHZ	0x0100	/* 5 GHz spectrum channel */
222#define	IEEE80211_CHAN_PASSIVE	0x0200	/* Only passive scan allowed */
223#define	IEEE80211_CHAN_DYN	0x0400	/* Dynamic CCK-OFDM channel */
224#define	IEEE80211_CHAN_GFSK	0x0800	/* GFSK channel (FHSS PHY) */
225
226/* For IEEE80211_RADIOTAP_FLAGS */
227#define	IEEE80211_RADIOTAP_F_CFP	0x01	/* sent/received
228						 * during CFP
229						 */
230#define	IEEE80211_RADIOTAP_F_SHORTPRE	0x02	/* sent/received
231						 * with short
232						 * preamble
233						 */
234#define	IEEE80211_RADIOTAP_F_WEP	0x04	/* sent/received
235						 * with WEP encryption
236						 */
237#define	IEEE80211_RADIOTAP_F_FRAG	0x08	/* sent/received
238						 * with fragmentation
239						 */
240#define	IEEE80211_RADIOTAP_F_FCS	0x10	/* frame includes FCS */
241#define	IEEE80211_RADIOTAP_F_DATAPAD	0x20	/* frame has padding between
242						 * 802.11 header and payload
243						 * (to 32-bit boundary)
244						 */
245#define IEEE80211_RADIOTAP_F_BADFCS	0x40	/* frame failed FCS check */
246
247/* For IEEE80211_RADIOTAP_RX_FLAGS */
248#define IEEE80211_RADIOTAP_F_RX_BADPLCP	0x0002 /* bad PLCP */
249
250/* For IEEE80211_RADIOTAP_TX_FLAGS */
251#define IEEE80211_RADIOTAP_F_TX_FAIL	0x0001	/* failed due to excessive
252						 * retries */
253#define IEEE80211_RADIOTAP_F_TX_CTS	0x0002	/* used cts 'protection' */
254#define IEEE80211_RADIOTAP_F_TX_RTS	0x0004	/* used rts/cts handshake */
255#define IEEE80211_RADIOTAP_F_TX_NOACK	0x0008	/* don't expect an ACK */
256
257/* For IEEE80211_RADIOTAP_AMPDU_STATUS */
258#define IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN		0x0001
259#define IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN		0x0002
260#define IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN		0x0004
261#define IEEE80211_RADIOTAP_AMPDU_IS_LAST		0x0008
262#define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR		0x0010
263#define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN	0x0020
264
265/* For IEEE80211_RADIOTAP_MCS */
266#define IEEE80211_RADIOTAP_MCS_HAVE_BW		0x01
267#define IEEE80211_RADIOTAP_MCS_HAVE_MCS		0x02
268#define IEEE80211_RADIOTAP_MCS_HAVE_GI		0x04
269#define IEEE80211_RADIOTAP_MCS_HAVE_FMT		0x08
270#define IEEE80211_RADIOTAP_MCS_HAVE_FEC		0x10
271#define IEEE80211_RADIOTAP_MCS_HAVE_STBC	0x20
272#define IEEE80211_RADIOTAP_MCS_HAVE_NESS	0x40
273#define IEEE80211_RADIOTAP_MCS_NESS_BIT1	0x80
274
275
276#define IEEE80211_RADIOTAP_MCS_BW_MASK		0x03
277#define		IEEE80211_RADIOTAP_MCS_BW_20	0
278#define		IEEE80211_RADIOTAP_MCS_BW_40	1
279#define		IEEE80211_RADIOTAP_MCS_BW_20L	2
280#define		IEEE80211_RADIOTAP_MCS_BW_20U	3
281#define IEEE80211_RADIOTAP_MCS_SGI		0x04
282#define IEEE80211_RADIOTAP_MCS_FMT_GF		0x08
283#define IEEE80211_RADIOTAP_MCS_FEC_LDPC		0x10
284#define IEEE80211_RADIOTAP_MCS_STBC_MASK	0x60
285#define IEEE80211_RADIOTAP_MCS_STBC_SHIFT	5
286#define		IEEE80211_RADIOTAP_MCS_STBC_1	1
287#define		IEEE80211_RADIOTAP_MCS_STBC_2	2
288#define		IEEE80211_RADIOTAP_MCS_STBC_3	3
289#define IEEE80211_RADIOTAP_MCS_NESS_BIT0	0x80
290
291#endif				/* IEEE80211_RADIOTAP_H */
292