From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerald Combs <gerald-IZ8446WsY0/dtAWm4Da02A@public.gmane.org>
Subject: Re: use of radiotap bit 14?
Date: Thu, 19 Jun 2008 11:28:01 -0700
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Johannes Berg wrote:
> I just noticed that at least wireshark also defines two non-standard
> bits for the 'flags' field (field bit 1):
> 
> #define IEEE80211_RADIOTAP_F_BADFCS     0x40    /* does not pass FCS check */
> #define IEEE80211_RADIOTAP_F_SHORTGI    0x80    /* HT short GI */
> 
> 
> Also, it defines that if the rate (field bit 2) is >= 0x80 (or rather,
> has bit 0x80 set) then the lower 4 bits are used to define some HT rate?
> 
> Where the hell did that come from?

FreeBSD: http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/net80211/ieee80211_radiotap.h