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

[clutton]

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?
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