Annotation of sys/net80211/ieee80211_radiotap.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ieee80211_radiotap.h,v 1.8 2006/06/23 21:34:15 reyk Exp $ */
2: /* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.3 2004/04/05 22:13:21 sam Exp $ */
3: /* $NetBSD: ieee80211_radiotap.h,v 1.9 2004/06/06 04:13:28 dyoung Exp $ */
4:
5: /*-
6: * Copyright (c) 2003, 2004 David Young. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. The name of David Young may not be used to endorse or promote
17: * products derived from this software without specific prior
18: * written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
21: * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22: * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
23: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
24: * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
26: * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
28: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
31: * OF SUCH DAMAGE.
32: */
33: #ifndef _NET_IF_IEEE80211RADIOTAP_H_
34: #define _NET_IF_IEEE80211RADIOTAP_H_
35:
36: /* A generic radio capture format is desirable. There is one for
37: * Linux, but it is neither rigidly defined (there were not even
38: * units given for some fields) nor easily extensible.
39: *
40: * I suggest the following extensible radio capture format. It is
41: * based on a bitmap indicating which fields are present.
42: *
43: * I am trying to describe precisely what the application programmer
44: * should expect in the following, and for that reason I tell the
45: * units and origin of each measurement (where it applies), or else I
46: * use sufficiently weaselly language ("is a monotonically nondecreasing
47: * function of...") that I cannot set false expectations for lawyerly
48: * readers.
49: */
50:
51: /* XXX tcpdump/libpcap do not tolerate variable-length headers,
52: * yet, so we pad every radiotap header to 64 bytes. Ugh.
53: */
54: #define IEEE80211_RADIOTAP_HDRLEN 64
55:
56: /* The radio capture header precedes the 802.11 header. */
57: struct ieee80211_radiotap_header {
58: u_int8_t it_version; /* Version 0. Only increases
59: * for drastic changes,
60: * introduction of compatible
61: * new fields does not count.
62: */
63: u_int8_t it_pad;
64: u_int16_t it_len; /* length of the whole
65: * header in bytes, including
66: * it_version, it_pad,
67: * it_len, and data fields.
68: */
69: u_int32_t it_present; /* A bitmap telling which
70: * fields are present. Set bit 31
71: * (0x80000000) to extend the
72: * bitmap by another 32 bits.
73: * Additional extensions are made
74: * by setting bit 31.
75: */
76: } __packed;
77:
78: /* Name Data type Units
79: * ---- --------- -----
80: *
81: * IEEE80211_RADIOTAP_TSFT u_int64_t microseconds
82: *
83: * Value in microseconds of the MAC's 64-bit 802.11 Time
84: * Synchronization Function timer when the first bit of the
85: * MPDU arrived at the MAC. For received frames, only.
86: *
87: * IEEE80211_RADIOTAP_CHANNEL 2 x u_int16_t MHz, bitmap
88: *
89: * Tx/Rx frequency in MHz, followed by flags (see below).
90: *
91: * IEEE80211_RADIOTAP_FHSS u_int16_t see below
92: *
93: * For frequency-hopping radios, the hop set (first byte)
94: * and pattern (second byte).
95: *
96: * IEEE80211_RADIOTAP_RATE u_int8_t 500kb/s
97: *
98: * Tx/Rx data rate
99: *
100: * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from
101: * one milliwatt (dBm)
102: *
103: * RF signal power at the antenna, decibel difference from
104: * one milliwatt.
105: *
106: * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from
107: * one milliwatt (dBm)
108: *
109: * RF noise power at the antenna, decibel difference from one
110: * milliwatt.
111: *
112: * IEEE80211_RADIOTAP_DB_ANTSIGNAL u_int8_t decibel (dB)
113: *
114: * RF signal power at the antenna, decibel difference from an
115: * arbitrary, fixed reference.
116: *
117: * IEEE80211_RADIOTAP_DB_ANTNOISE u_int8_t decibel (dB)
118: *
119: * RF noise power at the antenna, decibel difference from an
120: * arbitrary, fixed reference point.
121: *
122: * IEEE80211_RADIOTAP_BARKER_CODE_LOCK u_int16_t unitless
123: *
124: * Quality of Barker code lock. Unitless. Monotonically
125: * nondecreasing with "better" lock strength. Called "Signal
126: * Quality" in datasheets. (Is there a standard way to measure
127: * this?)
128: *
129: * IEEE80211_RADIOTAP_TX_ATTENUATION u_int16_t unitless
130: *
131: * Transmit power expressed as unitless distance from max
132: * power set at factory calibration. 0 is max power.
133: * Monotonically nondecreasing with lower power levels.
134: *
135: * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u_int16_t decibels (dB)
136: *
137: * Transmit power expressed as decibel distance from max power
138: * set at factory calibration. 0 is max power. Monotonically
139: * nondecreasing with lower power levels.
140: *
141: * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from
142: * one milliwatt (dBm)
143: *
144: * Transmit power expressed as dBm (decibels from a 1 milliwatt
145: * reference). This is the absolute power level measured at
146: * the antenna port.
147: *
148: * IEEE80211_RADIOTAP_FLAGS u_int8_t bitmap
149: *
150: * Properties of transmitted and received frames. See flags
151: * defined below.
152: *
153: * IEEE80211_RADIOTAP_ANTENNA u_int8_t antenna index
154: *
155: * Unitless indication of the Rx/Tx antenna for this packet.
156: * The first antenna is antenna 0.
157: *
158: * IEEE80211_RADIOTAP_FCS u_int32_t data
159: *
160: * FCS from frame in network byte order.
161: *
162: * IEEE80211_RADIOTAP_HWQUEUE u_int8_t data
163: *
164: * A specific hardware queue (used by WME)
165: *
166: * IEEE80211_RADIOTAP_RSSI 2x u_int8_t RSSI, max RSSI
167: *
168: * A relative Received Signal Strength Index
169: */
170: enum ieee80211_radiotap_type {
171: IEEE80211_RADIOTAP_TSFT = 0,
172: IEEE80211_RADIOTAP_FLAGS = 1,
173: IEEE80211_RADIOTAP_RATE = 2,
174: IEEE80211_RADIOTAP_CHANNEL = 3,
175: IEEE80211_RADIOTAP_FHSS = 4,
176: IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
177: IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
178: IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
179: IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
180: IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
181: IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
182: IEEE80211_RADIOTAP_ANTENNA = 11,
183: IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
184: IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
185: IEEE80211_RADIOTAP_FCS = 14,
186: IEEE80211_RADIOTAP_HWQUEUE = 15,
187: IEEE80211_RADIOTAP_RSSI = 16,
188: IEEE80211_RADIOTAP_EXT = 31
189: };
190:
191: /* For IEEE80211_RADIOTAP_FLAGS */
192: #define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
193: * during CFP
194: */
195: #define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
196: * with short
197: * preamble
198: */
199: #define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
200: * with WEP encryption
201: */
202: #define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
203: * with fragmentation
204: */
205:
206: #endif /* _NET_IF_IEEE80211RADIOTAP_H_ */
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