156 lines
5.0 KiB
C
156 lines
5.0 KiB
C
/*-
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* Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _NET80211_IEEE80211_PHY_H_
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#define _NET80211_IEEE80211_PHY_H_
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#ifdef _KERNEL
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/*
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* IEEE 802.11 PHY-related definitions.
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*/
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/*
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* Contention window (slots).
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*/
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#define IEEE80211_CW_MAX 1023 /* aCWmax */
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#define IEEE80211_CW_MIN_0 31 /* DS/CCK aCWmin, ERP aCWmin(0) */
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#define IEEE80211_CW_MIN_1 15 /* OFDM aCWmin, ERP aCWmin(1) */
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/*
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* SIFS (microseconds).
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*/
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#define IEEE80211_DUR_SIFS 10 /* DS/CCK/ERP SIFS */
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#define IEEE80211_DUR_OFDM_SIFS 16 /* OFDM SIFS */
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/*
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* Slot time (microseconds).
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*/
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#define IEEE80211_DUR_SLOT 20 /* DS/CCK slottime, ERP long slottime */
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#define IEEE80211_DUR_SHSLOT 9 /* ERP short slottime */
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#define IEEE80211_DUR_OFDM_SLOT 9 /* OFDM slottime */
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/*
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* DIFS (microseconds).
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*/
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#define IEEE80211_DUR_DIFS(sifs, slot) ((sifs) + 2 * (slot))
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struct ieee80211_channel;
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struct ieee80211_rate_table {
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int rateCount; /* NB: for proper padding */
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uint8_t rateCodeToIndex[256]; /* back mapping */
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struct {
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uint8_t phy; /* CCK/OFDM/TURBO */
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uint32_t rateKbps; /* transfer rate in kbs */
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uint8_t shortPreamble; /* mask for enabling short
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* preamble in CCK rate code */
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uint8_t dot11Rate; /* value for supported rates
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* info element of MLME */
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uint8_t ctlRateIndex; /* index of next lower basic
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* rate; used for dur. calcs */
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uint16_t lpAckDuration; /* long preamble ACK dur. */
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uint16_t spAckDuration; /* short preamble ACK dur. */
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} info[32];
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};
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const struct ieee80211_rate_table *ieee80211_get_ratetable(
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struct ieee80211_channel *);
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static __inline__ uint8_t
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ieee80211_ack_rate(const struct ieee80211_rate_table *rt, uint8_t rate)
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{
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uint8_t cix = rt->info[rt->rateCodeToIndex[rate]].ctlRateIndex;
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KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate));
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return rt->info[cix].dot11Rate;
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}
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static __inline__ uint8_t
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ieee80211_ctl_rate(const struct ieee80211_rate_table *rt, uint8_t rate)
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{
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uint8_t cix = rt->info[rt->rateCodeToIndex[rate]].ctlRateIndex;
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KASSERT(cix != (uint8_t)-1, ("rate %d has no info", rate));
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return rt->info[cix].dot11Rate;
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}
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static __inline__ enum ieee80211_phytype
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ieee80211_rate2phytype(const struct ieee80211_rate_table *rt, uint8_t rate)
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{
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uint8_t rix = rt->rateCodeToIndex[rate];
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KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
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return rt->info[rix].phy;
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}
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static __inline__ int
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ieee80211_isratevalid(const struct ieee80211_rate_table *rt, uint8_t rate)
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{
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return rt->rateCodeToIndex[rate] != (uint8_t)-1;
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}
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/*
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* Calculate ACK field for
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* o non-fragment data frames
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* o management frames
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* sent using rate, phy and short preamble setting.
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*/
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static __inline__ uint16_t
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ieee80211_ack_duration(const struct ieee80211_rate_table *rt,
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uint8_t rate, int isShortPreamble)
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{
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uint8_t rix = rt->rateCodeToIndex[rate];
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KASSERT(rix != (uint8_t)-1, ("rate %d has no info", rate));
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if (isShortPreamble) {
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KASSERT(rt->info[rix].spAckDuration != 0,
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("shpreamble ack dur is not computed!\n"));
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return rt->info[rix].spAckDuration;
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} else {
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KASSERT(rt->info[rix].lpAckDuration != 0,
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("lgpreamble ack dur is not computed!\n"));
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return rt->info[rix].lpAckDuration;
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}
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}
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/*
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* Compute the time to transmit a frame of length frameLen bytes
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* using the specified 802.11 rate code, phy, and short preamble
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* setting.
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*
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* NB: SIFS is included.
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*/
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uint16_t ieee80211_compute_duration(const struct ieee80211_rate_table *,
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uint32_t frameLen, uint16_t rate, int isShortPreamble);
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/*
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* Convert PLCP signal/rate field to 802.11 rate code (.5Mbits/s)
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*/
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uint8_t ieee80211_plcp2rate(uint8_t, enum ieee80211_phytype);
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/*
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* Convert 802.11 rate code to PLCP signal.
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*/
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uint8_t ieee80211_rate2plcp(int, enum ieee80211_phytype);
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#endif /* _KERNEL */
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#endif /* !_NET80211_IEEE80211_PHY_H_ */
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