This puts the code for creating IPv6 addresses from MAC
address and EUI into functions, so it can be reused.
This should be particularly helpful if code is rewritten later.
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Tested-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Tim Niemeyer <tim@tn-x.org>
