From David Young:

From David Young:

	[This patch] fixes some bugs and adds a new feature.  Control
	packets were showing as [|802.11] because tcpdump expected for
	there to be an FCS on each one (wrong assumption).  Also, even
	if pieces of a control packet are missing, I have made tcpdump
	print its type when it knows it.  The new features is that if
	you give -v, the 802.11 Duration field (for virtual carrier
	sense) is printed.  This is useful for detecting
	hardware/firmware bugs (!!) and for debugging the new crop of
	802.11 drivers.