Roaming problems

Lars Ericsson Lars_Ericsson at telia.com
Wed Apr 23 12:27:41 EDT 2008


> > The below patch makes sure that we drop the BSSID when we 
> disassociate.
> 
> > --- a/ieee80211_sta.c	Wed Apr 23 10:14:30 2008
> > +++ b/ieee80211_sta.c	Wed Apr 23 08:41:23 2008
> > @@ -479,6 +479,9 @@ static void ieee80211_set_associated(str
> >  		netif_carrier_off(dev);
> >  		ieee80211_reset_erp_info(dev);
> >  		memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
> > +
> > +		// make sure no association start before we got 
> a new BSSID
> > +		ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
> 
> I don't think that patch makes sense, after all, userspace 
> could request to disassociate and afterwards re-request to 
> associate by setting the SSID and not setting the BSSID 
> again, which would lose the fixed BSSID without userspace interaction.
> 
> However, I'm not sure how to fix this.
> 

Ok, I had that in mind but could not see how to solve that.

The root problem is that the drive start associate when any of the
ieee80211_ioctl_siwgenie()
ieee80211_ioctl_siwessid() and ieee80211_ioctl_siwap() is called.
If the wpa_supplicant need call more than one of them the association start
to early.

I can see two ways to solve this:
1) Add an argument/flag to the ioctls above indicating if association should
start.
2) Add a new ioctrl that initiate the association.

My patch above relies on that the wpa_supplicant always end the AP setup
with a ieee80211_ioctl_siwap().

/Lars





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