/lib/udev/rules.d/84-nm-drivers.rules is in network-manager 1.6.2-3+deb9u2.
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 | # Do not modify this file, it will get overwritten on updates.
# To override or extend the rules place a file in /etc/udev/rules.d
SUBSYSTEM!="net", GOTO="nm_drivers_end"
ACTION!="add|change", GOTO="nm_drivers_end"
# Determine ID_NET_DRIVER if there's no ID_NET_DRIVER or DRIVERS (old udev?)
ENV{ID_NET_DRIVER}=="?*", GOTO="nm_drivers_end"
DRIVERS=="?*", GOTO="nm_drivers_end"
PROGRAM="/bin/sh -c 'ethtool -i $1 | sed -n s/^driver:\ //p' -- $env{INTERFACE}", RESULT=="?*", ENV{ID_NET_DRIVER}="%c"
LABEL="nm_drivers_end"
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