Message-ID: <1ba2fa240802011321r79297484m6381527457fdb919@mail.gmail.com> (sfid-20080201_212150_589186_750C4C51)
Date: Fri, 1 Feb 2008 23:21:46 +0200
From: "Tomas Winkler" <tomasw@gmail.com>
To: "Dan Williams" <dcbw@redhat.com>
Subject: Re: wireless mini-summit agenda proposals?
Cc: "Johannes Berg" <johannes@sipsolutions.net>,
	"John W. Linville" <linville@tuxdriver.com>,
	linux-wireless@vger.kernel.org
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On Feb 1, 2008 10:11 PM, Dan Williams <dcbw@redhat.com> wrote:
>
> On Fri, 2008-02-01 at 21:47 +0200, Tomas Winkler wrote:
> > On Feb 1, 2008 9:15 PM, Dan Williams <dcbw@redhat.com> wrote:
> > > On Fri, 2008-02-01 at 20:29 +0200, Tomas Winkler wrote:
> > > > On Feb 1, 2008 2:42 PM, Johannes Berg <johannes@sipsolutions.net> wrote:
> > > > >
> > > > > > cfg80211/nl80211 - overview, get Johannes to disseminate knowledge
> > > > > > because email isn't optimal for this.  I haven't had enough time to jump
> > > > > > into it yet, but the fact that Johannes is the vast majority of the
> > > > > > effort here is worrisome.  Having a reference implementation (airo,
> > > > > > atmel, maybe libertas) of a fullmac driver ported to cfg80211 would
> > > > > > probably be very useful, even just to get a sense of how the API works.
> > > > >
> > > > > cfg80211/nl80211 is no further for fullmac drivers than a year ago, all
> > > > > work it got so far is for hostapd.
> > > > >
> > > > > I have a fairly decent plan how to add association/... support but it
> > > > > lacks execution because it's completely boring work that doesn't buy us
> > > > > any new features since we still have to support wext.
> > > > >
> > > > Security setting is a bit  broken. There is a missing separation
> > > > between static and dynamic./WPA wep keys.
> > >
> > > How do you mean?
> >
> > In wext there is encoding setting for static keys only for wep and
> > extended encoding for dynamic keys including wep keys. In mac80211
> > both setting are funneled to the same point which is incorrect since
> > the usage is not the same. The major problem is in HW acceleration.
> > The static wep keys are passed as belonging to the station with
> > broadcast address and the driver cannot distinguish if the wep key is
> > dynamic key for the bcast address or it is a static wep key that has
> > to be used for all traffic. The problem is of course visible mostly in
> > AP mode.
>
> Ah; right.  I don't think there really should be a difference in the API
> to differentiate static vs. dynamic WEP keys.  Instead each key sent to
> the driver (be it WEP, TKIP, or CCMP) should definitely have a BSSID to
> which it applies which the userspace caller must set, and if the key is
> to be used for _all_ traffic, then maybe have a flag for that or use
> 00:00:00:00:00:00 as the BSSID.  If we use "magic" #s like 00:00... for
> the BSSID then we've got to be sure to document that magic # which is
> where we all fell down with WEXT.  Hence I prefer flags, but whatever.
>

Sure this is not good to make too many interfaces, but a flag must be
added, i prefer to not abusing BSSID address.
One other difference is that there might be 4 keys for static wep
while only one wep key in WPA.

Tomas

> Dan
>
>
>