diff options
Diffstat (limited to 'share/man')
| -rw-r--r-- | share/man/man9/ieee80211_radiotap.9 | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/share/man/man9/ieee80211_radiotap.9 b/share/man/man9/ieee80211_radiotap.9 index 1adebed..b0a3c63 100644 --- a/share/man/man9/ieee80211_radiotap.9 +++ b/share/man/man9/ieee80211_radiotap.9 @@ -1,6 +1,7 @@ .\" -.\" Copyright (c) 2004 Bruce M. Simpson <bms@spc.org> -.\" Copyright (c) 2004 Darron Broad <darron@kewl.org> +.\" Copyright (c) 2004 Bruce M. Simpson <bms@spc.org>, +.\" Darron Broad <darron@kewl.org>, +.\" David Young <dyoung@pobox.com>. .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without @@ -48,6 +49,22 @@ attachment for the capture of information about 802.11 traffic which is not part of the 802.11 frame structure. .Pp +Radiotap was designed to balance the desire for a capture format +that conserved CPU and memory bandwidth on embedded systems, +with the desire for a hardware-independent, extensible format +that would support the diverse capabilities of virtually all +.Vt 802.11 +radios. +.Pp +These considerations led radiotap to settle on a format consisting of +a standard preamble followed by an extensible bitmap indicating the +presence of optional capture fields. +.Pp +The capture fields were packed into the header as compactly as possible, +modulo the requirements that they had to be packed swiftly, +with suitable alignment, in the same order as the bits indicating +their presence. +.Pp This typically includes information such as signal quality and timestamps. This information may be used by a variety of user agents, including @@ -202,6 +219,7 @@ definitions first appeared in .Nx 1.5 , and were later ported to .Fx 4.6 . +.\" .Sh AUTHORS The .Nm |
