Reading burned-in NIC MAC address from the user space.

[clutton]

On Thu, 2014-03-06 at 08:35 -0700, Warner Losh wrote:
> On Mar 6, 2014, at 7:13 AM, clutton <clutton at zoho.com> wrote:
> 
> > Hi lists.
> > 
> > I'm porting a GNU macchanger to the FreeBSD. Everything has almost done,
> > except restoring the mac to the original one.
> > 
> > The Linux users can exploit ioctl with SIOCETHTOOL pointing to a proper
> > ifreq(ETHTOOL_GPERMADDR), I have no idea how to do this using FreeBSD,
> > is it even possible?
> 
> I’d check the source for ifconfig.
> 
> 	ifconfig ep0 link 1:2:3:4:5:6
> 
> does the trick…
> 
> Warner

No, it doesn't. It does the different trick :)
You misunderstood the question. I don't asked how to set the mac
address. The question is how to read burned in mac address from user
space. ifconfig is not capable doing such a thing.

As I can see the drivers read MAC from EEPROM using different ways. Is
there any interface to this low level work?

WHY:
The GNU macchanger has very nice option "--permanent Reset to original,
permanent hardware MAC". This is only one thing I haven't ported yet.
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