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Johannes Berg007e5dd2008-11-27 23:13:38 +01001/*
James Ketrenos3905ec42005-09-21 11:56:42 -05002 * 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>
Andy Greendfe6e812007-07-27 15:43:24 +020040#include <asm/unaligned.h>
James Ketrenos3905ec42005-09-21 11:56:42 -050041
James Ketrenos3905ec42005-09-21 11:56:42 -050042/* 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
Johannes Berg007e5dd2008-11-27 23:13:38 +010060/*
61 * The radio capture header precedes the 802.11 header.
Pavel Roskina0d69f22007-03-10 22:54:22 -050062 * All data in the header is little endian on all platforms.
63 */
James Ketrenos3905ec42005-09-21 11:56:42 -050064struct 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;
Pavel Roskina0d69f22007-03-10 22:54:22 -050071 __le16 it_len; /* length of the whole
James Ketrenos3905ec42005-09-21 11:56:42 -050072 * header in bytes, including
73 * it_version, it_pad,
74 * it_len, and data fields.
75 */
Pavel Roskina0d69f22007-03-10 22:54:22 -050076 __le32 it_present; /* A bitmap telling which
James Ketrenos3905ec42005-09-21 11:56:42 -050077 * 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 */
Johannes Berg6a86b9c2009-10-28 09:58:52 +010083} __packed;
James Ketrenos3905ec42005-09-21 11:56:42 -050084
Pavel Roskina0d69f22007-03-10 22:54:22 -050085/* Name Data type Units
86 * ---- --------- -----
James Ketrenos3905ec42005-09-21 11:56:42 -050087 *
Pavel Roskina0d69f22007-03-10 22:54:22 -050088 * IEEE80211_RADIOTAP_TSFT __le64 microseconds
James Ketrenos3905ec42005-09-21 11:56:42 -050089 *
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 *
Pavel Roskina0d69f22007-03-10 22:54:22 -050094 * IEEE80211_RADIOTAP_CHANNEL 2 x __le16 MHz, bitmap
James Ketrenos3905ec42005-09-21 11:56:42 -050095 *
96 * Tx/Rx frequency in MHz, followed by flags (see below).
97 *
Pavel Roskina0d69f22007-03-10 22:54:22 -050098 * IEEE80211_RADIOTAP_FHSS __le16 see below
James Ketrenos3905ec42005-09-21 11:56:42 -050099 *
100 * For frequency-hopping radios, the hop set (first byte)
101 * and pattern (second byte).
102 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500103 * IEEE80211_RADIOTAP_RATE u8 500kb/s
James Ketrenos3905ec42005-09-21 11:56:42 -0500104 *
105 * Tx/Rx data rate
106 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500107 * IEEE80211_RADIOTAP_DBM_ANTSIGNAL s8 decibels from
108 * one milliwatt (dBm)
James Ketrenos3905ec42005-09-21 11:56:42 -0500109 *
110 * RF signal power at the antenna, decibel difference from
111 * one milliwatt.
112 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500113 * IEEE80211_RADIOTAP_DBM_ANTNOISE s8 decibels from
114 * one milliwatt (dBm)
James Ketrenos3905ec42005-09-21 11:56:42 -0500115 *
116 * RF noise power at the antenna, decibel difference from one
117 * milliwatt.
118 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500119 * IEEE80211_RADIOTAP_DB_ANTSIGNAL u8 decibel (dB)
James Ketrenos3905ec42005-09-21 11:56:42 -0500120 *
121 * RF signal power at the antenna, decibel difference from an
122 * arbitrary, fixed reference.
123 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500124 * IEEE80211_RADIOTAP_DB_ANTNOISE u8 decibel (dB)
James Ketrenos3905ec42005-09-21 11:56:42 -0500125 *
126 * RF noise power at the antenna, decibel difference from an
127 * arbitrary, fixed reference point.
128 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500129 * IEEE80211_RADIOTAP_LOCK_QUALITY __le16 unitless
James Ketrenos3905ec42005-09-21 11:56:42 -0500130 *
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 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500136 * IEEE80211_RADIOTAP_TX_ATTENUATION __le16 unitless
James Ketrenos3905ec42005-09-21 11:56:42 -0500137 *
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 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500142 * IEEE80211_RADIOTAP_DB_TX_ATTENUATION __le16 decibels (dB)
James Ketrenos3905ec42005-09-21 11:56:42 -0500143 *
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 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500148 * IEEE80211_RADIOTAP_DBM_TX_POWER s8 decibels from
149 * one milliwatt (dBm)
James Ketrenos3905ec42005-09-21 11:56:42 -0500150 *
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 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500155 * IEEE80211_RADIOTAP_FLAGS u8 bitmap
James Ketrenos3905ec42005-09-21 11:56:42 -0500156 *
157 * Properties of transmitted and received frames. See flags
158 * defined below.
159 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500160 * IEEE80211_RADIOTAP_ANTENNA u8 antenna index
James Ketrenos3905ec42005-09-21 11:56:42 -0500161 *
162 * Unitless indication of the Rx/Tx antenna for this packet.
163 * The first antenna is antenna 0.
164 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500165 * IEEE80211_RADIOTAP_RX_FLAGS __le16 bitmap
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200166 *
167 * Properties of received frames. See flags defined below.
168 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500169 * IEEE80211_RADIOTAP_TX_FLAGS __le16 bitmap
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200170 *
171 * Properties of transmitted frames. See flags defined below.
172 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500173 * IEEE80211_RADIOTAP_RTS_RETRIES u8 data
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200174 *
175 * Number of rts retries a transmitted frame used.
176 *
Pavel Roskina0d69f22007-03-10 22:54:22 -0500177 * IEEE80211_RADIOTAP_DATA_RETRIES u8 data
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200178 *
179 * Number of unicast retries a transmitted frame used.
180 *
Johannes Berg6d744ba2011-01-27 14:13:17 +0100181 * IEEE80211_RADIOTAP_MCS u8, u8, u8 unitless
182 *
183 * Contains a bitmap of known fields/flags, the flags, and
184 * the MCS index.
185 *
Johannes Berg48613ec2012-07-05 11:32:16 +0200186 * IEEE80211_RADIOTAP_AMPDU_STATUS u32, u16, u8, u8 unitless
187 *
188 * Contains the AMPDU information for the subframe.
Johannes Berg51648922012-11-22 23:00:18 +0100189 *
190 * IEEE80211_RADIOTAP_VHT u16, u8, u8, u8[4], u8, u8, u16
191 *
192 * Contains VHT information about this frame.
James Ketrenos3905ec42005-09-21 11:56:42 -0500193 */
194enum ieee80211_radiotap_type {
195 IEEE80211_RADIOTAP_TSFT = 0,
196 IEEE80211_RADIOTAP_FLAGS = 1,
197 IEEE80211_RADIOTAP_RATE = 2,
198 IEEE80211_RADIOTAP_CHANNEL = 3,
199 IEEE80211_RADIOTAP_FHSS = 4,
200 IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
201 IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
202 IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
203 IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
204 IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
205 IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
206 IEEE80211_RADIOTAP_ANTENNA = 11,
207 IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
208 IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200209 IEEE80211_RADIOTAP_RX_FLAGS = 14,
210 IEEE80211_RADIOTAP_TX_FLAGS = 15,
211 IEEE80211_RADIOTAP_RTS_RETRIES = 16,
212 IEEE80211_RADIOTAP_DATA_RETRIES = 17,
Johannes Berg33e5a2f2010-02-03 10:24:30 +0100213
Johannes Berg6d744ba2011-01-27 14:13:17 +0100214 IEEE80211_RADIOTAP_MCS = 19,
Johannes Berg48613ec2012-07-05 11:32:16 +0200215 IEEE80211_RADIOTAP_AMPDU_STATUS = 20,
Johannes Berg51648922012-11-22 23:00:18 +0100216 IEEE80211_RADIOTAP_VHT = 21,
Johannes Berg6d744ba2011-01-27 14:13:17 +0100217
Johannes Berg33e5a2f2010-02-03 10:24:30 +0100218 /* valid in every it_present bitmap, even vendor namespaces */
219 IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE = 29,
220 IEEE80211_RADIOTAP_VENDOR_NAMESPACE = 30,
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200221 IEEE80211_RADIOTAP_EXT = 31
James Ketrenos3905ec42005-09-21 11:56:42 -0500222};
223
224/* Channel flags. */
225#define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
226#define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
227#define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
228#define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
229#define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */
230#define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */
231#define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */
232#define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */
233
234/* For IEEE80211_RADIOTAP_FLAGS */
235#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
236 * during CFP
237 */
238#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
239 * with short
240 * preamble
241 */
242#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
243 * with WEP encryption
244 */
245#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
246 * with fragmentation
247 */
248#define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
249#define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
250 * 802.11 header and payload
251 * (to 32-bit boundary)
252 */
Johannes Bergaae89832009-03-13 12:52:10 +0100253#define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* bad FCS */
254
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200255/* For IEEE80211_RADIOTAP_RX_FLAGS */
Johannes Bergaae89832009-03-13 12:52:10 +0100256#define IEEE80211_RADIOTAP_F_RX_BADPLCP 0x0002 /* frame has bad PLCP */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200257
258/* For IEEE80211_RADIOTAP_TX_FLAGS */
259#define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive
260 * retries */
261#define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */
262#define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */
Helmut Schaa893d73f2011-09-29 13:42:25 +0200263#define IEEE80211_RADIOTAP_F_TX_NOACK 0x0008 /* don't expect an ack */
James Ketrenos3905ec42005-09-21 11:56:42 -0500264
Johannes Berg6d744ba2011-01-27 14:13:17 +0100265
266/* For IEEE80211_RADIOTAP_MCS */
267#define IEEE80211_RADIOTAP_MCS_HAVE_BW 0x01
268#define IEEE80211_RADIOTAP_MCS_HAVE_MCS 0x02
269#define IEEE80211_RADIOTAP_MCS_HAVE_GI 0x04
270#define IEEE80211_RADIOTAP_MCS_HAVE_FMT 0x08
271#define IEEE80211_RADIOTAP_MCS_HAVE_FEC 0x10
272
273#define IEEE80211_RADIOTAP_MCS_BW_MASK 0x03
274#define IEEE80211_RADIOTAP_MCS_BW_20 0
275#define IEEE80211_RADIOTAP_MCS_BW_40 1
276#define IEEE80211_RADIOTAP_MCS_BW_20L 2
277#define IEEE80211_RADIOTAP_MCS_BW_20U 3
278#define IEEE80211_RADIOTAP_MCS_SGI 0x04
279#define IEEE80211_RADIOTAP_MCS_FMT_GF 0x08
280#define IEEE80211_RADIOTAP_MCS_FEC_LDPC 0x10
281
Johannes Berg48613ec2012-07-05 11:32:16 +0200282/* For IEEE80211_RADIOTAP_AMPDU_STATUS */
283#define IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN 0x0001
284#define IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN 0x0002
285#define IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN 0x0004
286#define IEEE80211_RADIOTAP_AMPDU_IS_LAST 0x0008
287#define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR 0x0010
288#define IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN 0x0020
Johannes Berg6d744ba2011-01-27 14:13:17 +0100289
Johannes Berg51648922012-11-22 23:00:18 +0100290/* For IEEE80211_RADIOTAP_VHT */
291#define IEEE80211_RADIOTAP_VHT_KNOWN_STBC 0x0001
292#define IEEE80211_RADIOTAP_VHT_KNOWN_TXOP_PS_NA 0x0002
293#define IEEE80211_RADIOTAP_VHT_KNOWN_GI 0x0004
294#define IEEE80211_RADIOTAP_VHT_KNOWN_SGI_NSYM_DIS 0x0008
295#define IEEE80211_RADIOTAP_VHT_KNOWN_LDPC_EXTRA_OFDM_SYM 0x0010
296#define IEEE80211_RADIOTAP_VHT_KNOWN_BEAMFORMED 0x0020
297#define IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH 0x0040
298#define IEEE80211_RADIOTAP_VHT_KNOWN_GROUP_ID 0x0080
299#define IEEE80211_RADIOTAP_VHT_KNOWN_PARTIAL_AID 0x0100
300
301#define IEEE80211_RADIOTAP_VHT_FLAG_STBC 0x01
302#define IEEE80211_RADIOTAP_VHT_FLAG_TXOP_PS_NA 0x02
303#define IEEE80211_RADIOTAP_VHT_FLAG_SGI 0x04
304#define IEEE80211_RADIOTAP_VHT_FLAG_SGI_NSYM_M10_9 0x08
305#define IEEE80211_RADIOTAP_VHT_FLAG_LDPC_EXTRA_OFDM_SYM 0x10
306#define IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED 0x20
307
308
Johannes Berg571ecf62007-07-27 15:43:22 +0200309/* helpers */
310static inline int ieee80211_get_radiotap_len(unsigned char *data)
311{
312 struct ieee80211_radiotap_header *hdr =
313 (struct ieee80211_radiotap_header *)data;
314
Harvey Harrison8b5ac312008-07-25 01:45:26 -0700315 return get_unaligned_le16(&hdr->it_len);
Johannes Berg571ecf62007-07-27 15:43:22 +0200316}
317
James Ketrenos3905ec42005-09-21 11:56:42 -0500318#endif /* IEEE80211_RADIOTAP_H */