Re: [PATCH V2 0/9] nl80211: add support for PTK/GTK handshake offload

[Johannes Berg <johannes@sipsolutions.net>]

Hi,

I think this looks really good. One thing though:

> Another change is the
> addition of the flag ATTR_WANT_1X_4WAY_HS that user-space has to pass
> in CONNECT request. Some drivers may need to be aware before the PMK
> is programmed through SET_PMK request.

I wonder how we really should do this, and if this is good enough.

There might be drivers that simply don't support the non-offloaded
case, so they assume you always have the newer wpa_s. That would seem
to be a legitimate decision, since the compatibility with that might
not make much sense for a completely new driver, and it might be a lot
of work to support TK operations.

We should therefore probably set the expectation that wpa_s - if it's
new enough - always uses the offloaded functionality and always sets
the WANT_1X. Then this is even better with such drivers, since they can
immediately reject the connect() command if want_1x isn't set.

Thoughts?

johannes