Re: turning off IBSS (with wext)

[Dan Williams <dcbw@redhat.com>]

On Fri, 2009-02-06 at 21:40 +0100, Johannes Berg wrote:
> On Fri, 2009-02-06 at 11:41 -0500, Dan Williams wrote:
> > On Fri, 2009-02-06 at 14:57 +0100, Johannes Berg wrote:
> > > Hi,
> > > 
> > > so I was testing IBSS, and found this strange behaviour:
> > > 
> > >  * wpa_supplicant (or NM?) will try to do SIWMLME(disassoc) in IBSS
> > >    mode, which seems kinda wrong. Why do we accept it? We send out a
> > >    frame and then do nothing else.
> > >  * Then I thought "iwconfig wlan1 essid off" - but that fails with
> > >    -EINVAL due to ieee80211_sta_find_ibss
> > > 
> > > It seems to me that either one of those, or both, should actually turn
> > > off beaconing.
> > 
> > Either one; the supplicant uses SIWMLME(disassoc) at various times (like
> > when leaving a BSS), and NM will sometimes set a NULL SSID when
> > deactivating the device.
> 
> Fun. Neither one actually works.

Yeah; I had to recently patch wpa_supplicant to really disassociate at
Jouni's suggestion; just telling the driver to disassoc isn't adequate
in all cases, because some drivers will just try to reassoc.  Instead,
unlocking the BSSID and setting a bogus SSID will usually actually
accomplish the disassociation in addition to the MLME disassoc...

Dan