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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 *
James Ketrenos3905ec42005-09-21 11:56:42 -0500181 */
182enum 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,
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200197 IEEE80211_RADIOTAP_RX_FLAGS = 14,
198 IEEE80211_RADIOTAP_TX_FLAGS = 15,
199 IEEE80211_RADIOTAP_RTS_RETRIES = 16,
200 IEEE80211_RADIOTAP_DATA_RETRIES = 17,
201 IEEE80211_RADIOTAP_EXT = 31
James Ketrenos3905ec42005-09-21 11:56:42 -0500202};
203
204/* Channel flags. */
205#define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
206#define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
207#define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
208#define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
209#define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */
210#define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */
211#define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */
212#define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */
213
214/* For IEEE80211_RADIOTAP_FLAGS */
215#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
216 * during CFP
217 */
218#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
219 * with short
220 * preamble
221 */
222#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
223 * with WEP encryption
224 */
225#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
226 * with fragmentation
227 */
228#define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
229#define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
230 * 802.11 header and payload
231 * (to 32-bit boundary)
232 */
Johannes Bergaae89832009-03-13 12:52:10 +0100233#define IEEE80211_RADIOTAP_F_BADFCS 0x40 /* bad FCS */
234
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200235/* For IEEE80211_RADIOTAP_RX_FLAGS */
Johannes Bergaae89832009-03-13 12:52:10 +0100236#define IEEE80211_RADIOTAP_F_RX_BADPLCP 0x0002 /* frame has bad PLCP */
Marcelo Tosatti876c9d32007-02-10 12:25:27 -0200237
238/* For IEEE80211_RADIOTAP_TX_FLAGS */
239#define IEEE80211_RADIOTAP_F_TX_FAIL 0x0001 /* failed due to excessive
240 * retries */
241#define IEEE80211_RADIOTAP_F_TX_CTS 0x0002 /* used cts 'protection' */
242#define IEEE80211_RADIOTAP_F_TX_RTS 0x0004 /* used rts/cts handshake */
James Ketrenos3905ec42005-09-21 11:56:42 -0500243
244/* Ugly macro to convert literal channel numbers into their mhz equivalents
245 * There are certianly some conditions that will break this (like feeding it '30')
246 * but they shouldn't arise since nothing talks on channel 30. */
247#define ieee80211chan2mhz(x) \
248 (((x) <= 14) ? \
249 (((x) == 14) ? 2484 : ((x) * 5) + 2407) : \
250 ((x) + 1000) * 5)
251
Johannes Berg571ecf62007-07-27 15:43:22 +0200252/* helpers */
253static inline int ieee80211_get_radiotap_len(unsigned char *data)
254{
255 struct ieee80211_radiotap_header *hdr =
256 (struct ieee80211_radiotap_header *)data;
257
Harvey Harrison8b5ac312008-07-25 01:45:26 -0700258 return get_unaligned_le16(&hdr->it_len);
Johannes Berg571ecf62007-07-27 15:43:22 +0200259}
260
James Ketrenos3905ec42005-09-21 11:56:42 -0500261#endif /* IEEE80211_RADIOTAP_H */