Problem with disconnect and reconnect

Marlon Smith marlon.smith10 at gmail.com
Mon Apr 27 22:11:27 EDT 2015


I've distilled the problem down so it's easily reproducible.  Using this
wpa_supplicant.conf file:

ap_scan=2
network={
        ssid="adhoctest"
        key_mgmt=NONE
        wep_key0="12345"
        mode=2
        frequency=2412
}

and starting wpa_supplicant from the command line like this:

wpa_supplicant -Dnl80211 -iwlan0 -c/etc/wpa_host.conf

Only works half the time.  Every second time, the authentication fails.
If I reboot the unit between each attempt, the result is still about
50/50 whether it works or not.


On Mon, 2015-04-27 at 18:30 -0700, Marlon Smith wrote:

> I attempted to connect with my laptop to the AP to see if I could get
> some more info.  Here is the error reported by the laptop when it
> fails to connect:
> 
> wlan0: SME: Trying to authenticate with 00:25:f0:51:72:99 (SSID='CSI
> LCD 51:72:99' freq=2412 MHz)
> wlan0: State: SCANNING -> AUTHENTICATING
> EAPOL: External notification - EAP success=0
> EAPOL: External notification - EAP fail=0
> EAPOL: External notification - portControl=ForceAuthorized
> nl80211: Authenticate (ifindex=3)
> wpa_driver_nl80211_set_key: ifindex=3 (wlan0) alg=1 addr=(nil)
> key_idx=0 set_tx=1 seq_len=0 key_len=5
> nl80211: set_key failed; err=-67 Link has been severed)
> 
> 
> 
> On Mon, 2015-04-27 at 15:57 -0500, Dan Williams wrote: 
> 
> > On Mon, 2015-04-27 at 13:46 -0700, Marlon Smith wrote:
> > > I've tried calling disconnect() before removing the network, but I get
> > > the same result.  Calling disconnect() puts the state into
> > > interface_disabled, and I have to restart wpa_supplicant in order to
> > > recover.
> > 
> > Your app may need to set IFF_UP on the interface (outside of the
> > supplicant) before attempting the AddNetwork/SelectNetwork/Scan
> > operations.  It appears that something is removing the IFF_UP flag, be
> > that the mac80211 stack, cfg80211, the driver itself, or the supplicant.
> > I looked at wpa_supplicant 2.4 and couldn't find anywhere the supplicant
> > would do it, nor does rtl2x00 seem to do it anywhere.  There are a
> > couple places in mac80211 and cfg80211 that do so, but those are
> > typically in response to a "reconfig failure" or removing all
> > interfaces.  In any case, this is what's happening, and if it's not
> > possible to track down what's causing it, just setting the interface
> > IFF_UP in your app should work around it.
> > 
> > Dan
> > 
> > > On Mon, 2015-04-27 at 21:58 +0200, Floris Bos wrote:
> > > > On 04/27/2015 09:44 PM, Marlon Smith wrote:
> > > > 
> > > > > 
> > > > > I'm using wpa_supplicant with nl80211 and the rt2800usb driver in my
> > > > > application, which allows user to connect to a network or create an
> > > > > access point.  I'm using the dbus interface of wpa_supplicant to
> > > > > control the connection.
> > > > > 
> > > > > The user is able to enable/disable the connection via a menu, and
> > > > > when they do I use AddNetwork and SelectNetwork to connect, and
> > > > > RemoveNetwork to disconnect.
> > > > 
> > > > 
> > > > Might want to use Disconnect() to disconnect.
> > > > 
> > > > 
> > > > Yours sincerely,
> > > > 
> > > > Floris Bos
> > > > 
> > > > 
> > > > _______________________________________________
> > > > HostAP mailing list
> > > > HostAP at lists.shmoo.com
> > > > http://lists.shmoo.com/mailman/listinfo/hostap
> > > 
> > > 
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> > 
> > 
> 
> 


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