Re: [RFC v2 1/2] cfg80211: support 4-way handshake offloading for WPA/WPA2-PSK

[Johannes Berg <johannes@sipsolutions.net>]

> While the existing WPA2-PSK cases all use 32 octet PMK, there are
> also
> 48 octet PMKs in use with EAP (Suite B 192-bit level and FILS with
> SHA384). Patch 2/2 seemed to look at the PMK length as well.. Should
> the same be done already with 1/2 so that the PSK case is separately
> validating exact match with 32 octets in length for PMK = PSK while
> the other cases allow longer PMK as well?
> 
> I never remember how the attr policy .len works, so that may already
> be the implicit behavior here, but it would be clearer to be more
> explicit about the possible lengths of the WLAN_ATTR_PMK and not
> assume that WLAN_PMK_LEN definition is the only possible option.

The .len verifies that it's at least that long. We're thus ignoring
additional bytes in the PSK case if they're present, which I suppose we
should fix by checking the exact length in the code separately.

johannes