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+/* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5 2005/01/22 20:12:05 sam Exp $ */
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+/* $NetBSD: ieee80211_radiotap.h,v 1.11 2005/06/22 06:16:02 dyoung Exp $ */
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+
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+/*-
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+ * Copyright (c) 2003, 2004 David Young. All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ * 3. The name of David Young may not be used to endorse or promote
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+ * products derived from this software without specific prior
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+ * written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
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+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
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+ * YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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+ * OF SUCH DAMAGE.
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+ */
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+
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+/*
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+ * Modifications to fit into the linux IEEE 802.11 stack,
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+ * Mike Kershaw (dragorn@kismetwireless.net)
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+ */
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+
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+#ifndef IEEE80211RADIOTAP_H
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+#define IEEE80211RADIOTAP_H
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+
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+#include <linux/if_ether.h>
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+#include <linux/kernel.h>
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+
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+/* Radiotap header version (from official NetBSD feed) */
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+#define IEEE80211RADIOTAP_VERSION "1.5"
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+/* Base version of the radiotap packet header data */
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+#define PKTHDR_RADIOTAP_VERSION 0
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+
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+/* A generic radio capture format is desirable. There is one for
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+ * Linux, but it is neither rigidly defined (there were not even
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+ * units given for some fields) nor easily extensible.
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+ *
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+ * I suggest the following extensible radio capture format. It is
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+ * based on a bitmap indicating which fields are present.
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+ *
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+ * I am trying to describe precisely what the application programmer
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+ * should expect in the following, and for that reason I tell the
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+ * units and origin of each measurement (where it applies), or else I
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+ * use sufficiently weaselly language ("is a monotonically nondecreasing
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+ * function of...") that I cannot set false expectations for lawyerly
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+ * readers.
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+ */
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+
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+/* XXX tcpdump/libpcap do not tolerate variable-length headers,
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+ * yet, so we pad every radiotap header to 64 bytes. Ugh.
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+ */
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+#define IEEE80211_RADIOTAP_HDRLEN 64
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+
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+/* The radio capture header precedes the 802.11 header. */
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+struct ieee80211_radiotap_header {
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+ u8 it_version; /* Version 0. Only increases
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+ * for drastic changes,
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+ * introduction of compatible
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+ * new fields does not count.
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+ */
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+ u8 it_pad;
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+ u16 it_len; /* length of the whole
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+ * header in bytes, including
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+ * it_version, it_pad,
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+ * it_len, and data fields.
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+ */
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+ u32 it_present; /* A bitmap telling which
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+ * fields are present. Set bit 31
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+ * (0x80000000) to extend the
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+ * bitmap by another 32 bits.
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+ * Additional extensions are made
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+ * by setting bit 31.
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+ */
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+};
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+
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+/* Name Data type Units
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+ * ---- --------- -----
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+ *
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+ * IEEE80211_RADIOTAP_TSFT u64 microseconds
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+ *
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+ * Value in microseconds of the MAC's 64-bit 802.11 Time
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+ * Synchronization Function timer when the first bit of the
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+ * MPDU arrived at the MAC. For received frames, only.
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+ *
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+ * IEEE80211_RADIOTAP_CHANNEL 2 x u16 MHz, bitmap
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+ *
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+ * Tx/Rx frequency in MHz, followed by flags (see below).
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+ *
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+ * IEEE80211_RADIOTAP_FHSS u16 see below
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+ *
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+ * For frequency-hopping radios, the hop set (first byte)
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+ * and pattern (second byte).
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+ *
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+ * IEEE80211_RADIOTAP_RATE u8 500kb/s
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+ *
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+ * Tx/Rx data rate
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+ *
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+ * IEEE80211_RADIOTAP_DBM_ANTSIGNAL int8_t decibels from
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+ * one milliwatt (dBm)
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+ *
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+ * RF signal power at the antenna, decibel difference from
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+ * one milliwatt.
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+ *
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+ * IEEE80211_RADIOTAP_DBM_ANTNOISE int8_t decibels from
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+ * one milliwatt (dBm)
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+ *
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+ * RF noise power at the antenna, decibel difference from one
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+ * milliwatt.
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+ *
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+ * IEEE80211_RADIOTAP_DB_ANTSIGNAL u8 decibel (dB)
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+ *
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+ * RF signal power at the antenna, decibel difference from an
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+ * arbitrary, fixed reference.
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+ *
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+ * IEEE80211_RADIOTAP_DB_ANTNOISE u8 decibel (dB)
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+ *
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+ * RF noise power at the antenna, decibel difference from an
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+ * arbitrary, fixed reference point.
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+ *
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+ * IEEE80211_RADIOTAP_LOCK_QUALITY u16 unitless
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+ *
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+ * Quality of Barker code lock. Unitless. Monotonically
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+ * nondecreasing with "better" lock strength. Called "Signal
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+ * Quality" in datasheets. (Is there a standard way to measure
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+ * this?)
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+ *
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+ * IEEE80211_RADIOTAP_TX_ATTENUATION u16 unitless
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+ *
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+ * Transmit power expressed as unitless distance from max
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+ * power set at factory calibration. 0 is max power.
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+ * Monotonically nondecreasing with lower power levels.
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+ *
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+ * IEEE80211_RADIOTAP_DB_TX_ATTENUATION u16 decibels (dB)
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+ *
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+ * Transmit power expressed as decibel distance from max power
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+ * set at factory calibration. 0 is max power. Monotonically
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+ * nondecreasing with lower power levels.
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+ *
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+ * IEEE80211_RADIOTAP_DBM_TX_POWER int8_t decibels from
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+ * one milliwatt (dBm)
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+ *
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+ * Transmit power expressed as dBm (decibels from a 1 milliwatt
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+ * reference). This is the absolute power level measured at
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+ * the antenna port.
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+ *
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+ * IEEE80211_RADIOTAP_FLAGS u8 bitmap
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+ *
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+ * Properties of transmitted and received frames. See flags
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+ * defined below.
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+ *
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+ * IEEE80211_RADIOTAP_ANTENNA u8 antenna index
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+ *
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+ * Unitless indication of the Rx/Tx antenna for this packet.
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+ * The first antenna is antenna 0.
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+ *
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+ * IEEE80211_RADIOTAP_FCS u32 data
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+ *
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+ * FCS from frame in network byte order.
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+ */
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+enum ieee80211_radiotap_type {
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+ IEEE80211_RADIOTAP_TSFT = 0,
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+ IEEE80211_RADIOTAP_FLAGS = 1,
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+ IEEE80211_RADIOTAP_RATE = 2,
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+ IEEE80211_RADIOTAP_CHANNEL = 3,
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+ IEEE80211_RADIOTAP_FHSS = 4,
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+ IEEE80211_RADIOTAP_DBM_ANTSIGNAL = 5,
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+ IEEE80211_RADIOTAP_DBM_ANTNOISE = 6,
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+ IEEE80211_RADIOTAP_LOCK_QUALITY = 7,
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+ IEEE80211_RADIOTAP_TX_ATTENUATION = 8,
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+ IEEE80211_RADIOTAP_DB_TX_ATTENUATION = 9,
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+ IEEE80211_RADIOTAP_DBM_TX_POWER = 10,
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+ IEEE80211_RADIOTAP_ANTENNA = 11,
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+ IEEE80211_RADIOTAP_DB_ANTSIGNAL = 12,
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+ IEEE80211_RADIOTAP_DB_ANTNOISE = 13,
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+ IEEE80211_RADIOTAP_EXT = 31,
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+};
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+
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+/* Channel flags. */
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+#define IEEE80211_CHAN_TURBO 0x0010 /* Turbo channel */
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+#define IEEE80211_CHAN_CCK 0x0020 /* CCK channel */
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+#define IEEE80211_CHAN_OFDM 0x0040 /* OFDM channel */
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+#define IEEE80211_CHAN_2GHZ 0x0080 /* 2 GHz spectrum channel. */
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+#define IEEE80211_CHAN_5GHZ 0x0100 /* 5 GHz spectrum channel */
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+#define IEEE80211_CHAN_PASSIVE 0x0200 /* Only passive scan allowed */
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+#define IEEE80211_CHAN_DYN 0x0400 /* Dynamic CCK-OFDM channel */
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+#define IEEE80211_CHAN_GFSK 0x0800 /* GFSK channel (FHSS PHY) */
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+
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+/* For IEEE80211_RADIOTAP_FLAGS */
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+#define IEEE80211_RADIOTAP_F_CFP 0x01 /* sent/received
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+ * during CFP
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+ */
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+#define IEEE80211_RADIOTAP_F_SHORTPRE 0x02 /* sent/received
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+ * with short
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+ * preamble
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+ */
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+#define IEEE80211_RADIOTAP_F_WEP 0x04 /* sent/received
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+ * with WEP encryption
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+ */
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+#define IEEE80211_RADIOTAP_F_FRAG 0x08 /* sent/received
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+ * with fragmentation
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+ */
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+#define IEEE80211_RADIOTAP_F_FCS 0x10 /* frame includes FCS */
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+#define IEEE80211_RADIOTAP_F_DATAPAD 0x20 /* frame has padding between
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+ * 802.11 header and payload
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+ * (to 32-bit boundary)
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+ */
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+
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+/* Ugly macro to convert literal channel numbers into their mhz equivalents
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+ * There are certianly some conditions that will break this (like feeding it '30')
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+ * but they shouldn't arise since nothing talks on channel 30. */
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+#define ieee80211chan2mhz(x) \
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+ (((x) <= 14) ? \
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+ (((x) == 14) ? 2484 : ((x) * 5) + 2407) : \
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+ ((x) + 1000) * 5)
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+
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+#endif /* IEEE80211_RADIOTAP_H */
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James Ketrenos