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Explain how the extension bit works in the bitmap that tells which 

fields are present.
This commit is contained in:
dyoung 2005-07-11 21:59:12 +00:00
parent d01f5b39f6
commit 1dd028fbc1
1 changed files with 7 additions and 2 deletions
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9
share/man/man9/ieee80211_radiotap.9
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@ -1,4 +1,4 @@
.\" $NetBSD: ieee80211_radiotap.9,v 1.3 2005/04/25 14:37:49 wiz Exp $
.\" $NetBSD: ieee80211_radiotap.9,v 1.4 2005/07/11 21:59:12 dyoung Exp $
.\"
.\" Copyright (c) 2004 Bruce M. Simpson <bms@spc.org>,
.\" Darron Broad <darron@kewl.org>,
@ -186,7 +186,12 @@ arbitrary, fixed reference.
This bit is reserved for any future extensions to the
.Vt radiotap
structure.
It should not be used at this time.
A driver sets IEEE80211_RADIOTAP_EXT to extend the it_present bitmap
by another 64 bits.
The bitmap can be extended by multiples of 32 bits to 96, 128, 160
bits or longer, by setting IEEE80211_RADIOTAP_EXT in the extensions.
The bitmap ends at the first extension field where IEEE80211_RADIOTAP_EXT
is not set.
.El
.Sh EXAMPLES
Radiotap header for the Cisco Aironet driver: