netdev - How does the linux kernel select the MAC address for TAP devices?

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Date:	Mon, 16 Jun 2014 10:00:14 +0200
From:	Albert Krenz <albert.krenz87@...glemail.com>
To:	netdev@...r.kernel.org
Subject: How does the linux kernel select the MAC address for TAP devices?

As stated in the email subject: Where does the kernel get the used
MAC-Adress for a newly create TAP device? Are they randomly generated
or does it select one from a fixed pool of reserved MAC-Adresses?

I have not found any official documentation about the selection of
MAC-addresses for TAP-devices. Most sites like
http://backreference.org/2010/03/26/tuntap-interface-tutorial/ state
that the MAC addresses are auto-generated and can be changed. But they
do not explain the generation rules.

Does anyone know an official document (preferably from kernel.org)
explaining the MAC selection process? Or is it only explained in the
Source?
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