Re: WLAN not working anymore after changing the MAC address

Re: WLAN not working anymore after changing the MAC address

[Arend van Spriel]

On 12/09/2012 09:40 AM, Maximilian Engelhardt wrote:
> Hello,
> 
> According to http://wireless.kernel.org/en/users/Drivers/brcm80211
> I should report bugs to this list so here it is.

Not sure if we are dealing with a bug here.

> After changing the MAC address of my wireless network interface it
> doesn't work anymore. I would very much like to change the MAC
> address to avoid being traceable by it. Steps how this can be
> reproduced are shown below. Here is first some information about my
> Hardware and test setup:
> 

How is this supposed to be distributed to the driver? I have been
looking in the mac80211 interface. The only callback that I can think
is is the change_interface() callback although the documentation does
state this is only for changing the interface type. Or is it to be
done upon add_interface()?

Gr. AvS

Re: WLAN not working anymore after changing the MAC address

[Johannes Berg]

On Sun, 2012-12-09 at 18:52 +0100, Arend van Spriel wrote:

> > After changing the MAC address of my wireless network interface it
> > doesn't work anymore. I would very much like to change the MAC
> > address to avoid being traceable by it. Steps how this can be
> > reproduced are shown below. Here is first some information about my
> > Hardware and test setup:
> > 
> 
> How is this supposed to be distributed to the driver? I have been
> looking in the mac80211 interface. The only callback that I can think
> is is the change_interface() callback although the documentation does
> state this is only for changing the interface type. Or is it to be
> done upon add_interface()?

You should read the interface address in add_interface and basically
never use perm_addr. change_interface can't change it as it's only
called while an interface is up.

johannes

Re: WLAN not working anymore after changing the MAC address

[Johannes Berg]

On Sun, 2012-12-09 at 19:24 +0100, Johannes Berg wrote:
> On Sun, 2012-12-09 at 18:52 +0100, Arend van Spriel wrote:
> 
> > > After changing the MAC address of my wireless network interface it
> > > doesn't work anymore. I would very much like to change the MAC
> > > address to avoid being traceable by it. Steps how this can be
> > > reproduced are shown below. Here is first some information about my
> > > Hardware and test setup:
> > > 
> > 
> > How is this supposed to be distributed to the driver? I have been
> > looking in the mac80211 interface. The only callback that I can think
> > is is the change_interface() callback although the documentation does
> > state this is only for changing the interface type. Or is it to be
> > done upon add_interface()?
> 
> You should read the interface address in add_interface and basically

read ... well that came out wrong. I mean use vif->addr.

johannes

Re: WLAN not working anymore after changing the MAC address

[Arend van Spriel]

On 12/09/2012 07:25 PM, Johannes Berg wrote:
> On Sun, 2012-12-09 at 19:24 +0100, Johannes Berg wrote:
>> On Sun, 2012-12-09 at 18:52 +0100, Arend van Spriel wrote:
>>
>>>> After changing the MAC address of my wireless network interface it
>>>> doesn't work anymore. I would very much like to change the MAC
>>>> address to avoid being traceable by it. Steps how this can be
>>>> reproduced are shown below. Here is first some information about my
>>>> Hardware and test setup:
>>>>
>>>
>>> How is this supposed to be distributed to the driver? I have been
>>> looking in the mac80211 interface. The only callback that I can think
>>> is is the change_interface() callback although the documentation does
>>> state this is only for changing the interface type. Or is it to be
>>> done upon add_interface()?
>>
>> You should read the interface address in add_interface and basically
> 
> read ... well that came out wrong. I mean use vif->addr.

Thanks, Johannes

I got the idea of it.

Gr. AvS