/lib/udev/rules.d/71-biosdevname.rules is in biosdevname 0.4.1-0ubuntu6.
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 19 20 21 22 23 | SUBSYSTEM!="net", GOTO="netdevicename_end"
KERNEL!="eth*", GOTO="netdevicename_end"
ACTION!="add", GOTO="netdevicename_end"
NAME=="?*", GOTO="netdevicename_end"
# kernel command line "biosdevname={0|1}" can turn off/on biosdevname
IMPORT{cmdline}="biosdevname"
ENV{biosdevname}=="?*", ENV{UDEV_BIOSDEVNAME}="$env{biosdevname}"
# ENV{UDEV_BIOSDEVNAME} can be used for blacklist/whitelist
# but will be overwritten by the kernel command line argument
ENV{UDEV_BIOSDEVNAME}=="0", GOTO="netdevicename_end"
ENV{UDEV_BIOSDEVNAME}=="1", GOTO="netdevicename_start"
# uncomment the next line for biosdevname to be off by default
# GOTO="netdevicename_end"
LABEL="netdevicename_start"
# using NAME= instead of setting INTERFACE_NAME, so that persistent
# names aren't generated for these devices, they are "named" on each boot.
PROGRAM="/sbin/biosdevname --smbios 2.6 --nopirq --policy physical -i %k", NAME="%c", OPTIONS+="string_escape=replace"
LABEL="netdevicename_end"
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