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Re: mac80211 drops packet with old IV after rekeying

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On Fri, 2015-05-15 at 10:52 +0300, Emmanuel Grumbach wrote:
> >> I'd be glad if someone could take a look. If not, I'll have someone
> >> from our team to look at it, but I don't know how long it will take...
> >
> > Without looking too much - it seems to me that this is a fundamental
> > problem with PTK rekeying, in that it re-uses the key index that is
> > intended to avoid this.
> 
> In this case, the AP is openWRT. I guess the Key idx is chosen in
> software, so maybe the proper fix would be to have openWRT increment
> the key index when it rekeys?

Neither the spec nor the code allow that.

johannes

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