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

[clutton]

On Thu, 2014-03-06 at 11:16 -0700, Warner Losh wrote:
> On Mar 6, 2014, at 11:07 AM, clutton <clutton at zoho.com> wrote:
> 
> > 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.
> 
> ifconfig foo0 | grep link
> 
> is the usual answer here :)
> 
> > 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.
> 
> so you want to be able to ask the driver for the original mac address?
> 
> Warner

Exactly.
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