/etc/freeradius/modules/mac2vlan is in freeradius 2.2.5+dfsg-0.2+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | # -*- text -*-
#
#  $Id: bdfef238076bb1ea16c494bf6e22f1d2af848b62 $
#  A simple file to map a MAC address to a VLAN.
#
#  The file should be in the format MAC,VLAN
#  the VLAN name cannot have spaces in it, for example:
#
#	00:01:02:03:04:05,VLAN1
#	03:04:05:06:07:08,VLAN2
#	...
#
passwd mac2vlan {
	filename = ${confdir}/mac2vlan
	format = "*VMPS-Mac:=VMPS-VLAN-Name"
	delimiter = ","
}
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