diff options
author | sam <sam@FreeBSD.org> | 2003-09-05 22:19:32 +0000 |
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committer | sam <sam@FreeBSD.org> | 2003-09-05 22:19:32 +0000 |
commit | bdc819fefbf4712e9dabafda6a0950b35837e6d0 (patch) | |
tree | 0c193b1927bb959f78a20af1a7c3934ea5585ac6 /sys/net80211/ieee80211_radiotap.h | |
parent | f79f1784c94bcbf5a38cf80c1a851190040b5fcc (diff) | |
download | FreeBSD-src-bdc819fefbf4712e9dabafda6a0950b35837e6d0.zip FreeBSD-src-bdc819fefbf4712e9dabafda6a0950b35837e6d0.tar.gz |
Experimental bpf capture format for 802.11 devices. The link layer
type belongs in net/bpf.h but we keep it here for the moment.
P:
Submittep by:
Obtained from: David Young <dyoung@pobox.com>
Diffstat (limited to 'sys/net80211/ieee80211_radiotap.h')
-rw-r--r-- | sys/net80211/ieee80211_radiotap.h | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/sys/net80211/ieee80211_radiotap.h b/sys/net80211/ieee80211_radiotap.h new file mode 100644 index 0000000..d263d53 --- /dev/null +++ b/sys/net80211/ieee80211_radiotap.h @@ -0,0 +1,185 @@ +/* $FreeBSD$ */ +/* $NetBSD: $ */ + +/*- + * 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. + */ +#ifndef DLT_IEEE802_11_RADIO +#define DLT_IEEE802_11_RADIO 127 /* 802.11 plus WLAN header */ +#endif + +/* The radio capture header precedes the 802.11 header. */ +struct ieee80211_radiotap_header { + u_int8_t it_version; /* Version 0. Only increases + * for drastic changes, + * introduction of compatible + * new LTVs 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 LTVs. + */ + 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. + */ +}; + +/* Name Data type Units + * ---- --------- ----- + * + * IEEE80211_RADIOTAP_CHANNEL u_int8_t MHz + * + * Tx/Rx channel number (for DSSS/OFDM/PBCC PHY) + * + * 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 .5Mb/s + * + * IEEE Tx/Rx data rate cookie (including basic rate flag) + * + * IEEE80211_RADIOTAP_DB_ANTSIGNAL int16_t decibel (dB) + * + * RF signal power at the antenna, measured from a fixed, + * arbitrary reference point. + * + * IEEE80211_RADIOTAP_DB_ANTNOISE int16_t decibel (dB) + * + * RF noise power at the antenna in decibels from an arbitrary, + * fixed reference point. + * + * IEEE80211_RADIOTAP_BARKER_CODE_LOCK 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 u_int16_t decibels from + * 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_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. + * Little-endian byte order. + * + * IEEE80211_RADIOTAP_FLAGS u_int16_t bitmap + * + * Properties of transmitted and received frames. See flags + * defined below. + * + * IEEE80211_RADIOTAP_TIME u_int32_t microseconds + * + * For radios that provide it: packet arrival time in + * microseconds. Prism hardware will provide this, but it is + * not known whether it marks the first or the last bit of + * the frame. Nor is it known where that bit has arrived + * (antenna, modem, MAC?) when the time is measured. + * + * IEEE80211_RADIOTAP_ANTENNA u_int16_t antenna index + * + * Unitless indication of the Rx/Tx antenna for this packet. + * The first antenna is antenna 0. + */ +enum ieee80211_radiotap_type { + IEEE80211_RADIOTAP_PAD = 0, + IEEE80211_RADIOTAP_FLAGS = 1, + IEEE80211_RADIOTAP_RATE = 2, + IEEE80211_RADIOTAP_CHANNEL = 3, + IEEE80211_RADIOTAP_FHSS = 4, + IEEE80211_RADIOTAP_DB_ANTSIGNAL = 5, + IEEE80211_RADIOTAP_DB_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_TSFT = 12, + IEEE80211_RADIOTAP_EXT = 31, + IEEE80211_RADIOTAP_TIME = 32 +}; + +/* For IEEE80211_RADIOTAP_FLAGS */ +#define IEEE80211_RADIOTAP_F_CFP 0x0001 /* sent/received + * during CFP + */ +#define IEEE80211_RADIOTAP_F_SHORTPRE 0x0002 /* sent/received + * with short + * preamble + */ +#define IEEE80211_RADIOTAP_F_WEP 0x0004 /* sent/received + * with WEP encryption + */ +#define IEEE80211_RADIOTAP_F_FRAG 0x0008 /* sent/received + * with fragmentation + */ + +#endif /* _NET_IF_IEEE80211RADIOTAP_H_ */ |