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Re: [RFC 1/2] mac80211: allow drivers to indicate failed FCS/PLCP checksum

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On Wednesday 22 August 2007, Johannes Berg wrote:
> On Tue, 2007-08-21 at 23:07 +0200, Ivo van Doorn wrote:
> 
> > Do we need another flag to indicate ICV errors?
> > rt2x00 has the following fields to indicate problems during hardware decryption:
> > 	ICV error -> How to report this to mac80211?
> > 	MIC error -> The RX_FLAG_MMIC_ERROR flag can be set
> > 	invalid key -> Could best be done by just not setting RX_FLAG_DECRYPTED I assume.
> 
> I think you either just drop the packet or give it to mac80211 decrypted
> but with ICV still on so that mac80211 will verify the ICV (again) and
> do whatever is appropriate. But I think dropping it ought to be fine. Do
> we want this for monitoring maybe?

Not sure how interesting a frame with a ICV error will be,
on the other hand I am not even sure how a frame with a ICV error
looks like in rt2x00, discovering that will probably happen during
the hardware encryption implementation. ;)

Ivo
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