Re: ath9k and TKIP hw crypto in AP mode

[pat-lkml <pat-lkml@erley.org>]

Jouni Malinen wrote:
> On Tue, Feb 24, 2009 at 03:07:20PM -0500, pat-lkml wrote:
>> pass phrase.  Use nohwcrypt=1, hostapd now works perfectly with wep/wpa/wpa2, while
>> with nohwcrypt=0, I get errors (that I'll need physical access to my computer to 
>> debug/log) in wpa only.
> 
> Thanks, I was able to reproduce this and figure out what was happening.
> It looks like I have not tested TKIP in AP mode before (I've been mainly
> testing HT and that does not allow TKIP..). Anyway, the Michael MIC
> TX/RX keys are set incorrectly for the group key which will trigger
> Michael MIC errors on every broadcast frame.
> 
> I have more complete cleanup of the key configuration for ath9k in
> progress, but as far as this particular issue is concerned, the
> following change should resolve it. So far, I've only tested this with
> the current hardware revision, but I will test this with older design,
> too, and submit a proper patch later. Anyway, you may want to test this
> as a fix for TKIP in AP mode.
> 
> 
I had to make some changes to get it to build, am going to test shortly.

The relevant changes were adding:

struct ieee80211_vif *vif;
vif = sc->vifs[0];

to the 'else' condition, like the if(key->keyidx) condition.

Pat