/lib/udev/rules.d/73-usb-net-by-mac.rules is in udev 232-25+deb9u8.
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 | # Use MAC based names for network interfaces which are directly or indirectly
# on USB and have an universally administered (stable) MAC address (second bit
# is 0). Don't do this when ifnames is disabled via kernel command line or
# customizing/disabling 99-default.link (or previously 80-net-setup-link.rules).
IMPORT{cmdline}="net.ifnames"
ENV{net.ifnames}=="0", GOTO="usb_net_by_mac_end"
ACTION=="add", SUBSYSTEM=="net", SUBSYSTEMS=="usb", NAME=="", \
ATTR{address}=="?[014589cd]:*", \
TEST!="/etc/udev/rules.d/80-net-setup-link.rules", \
TEST!="/etc/systemd/network/99-default.link", \
IMPORT{builtin}="net_id", NAME="$env{ID_NET_NAME_MAC}"
LABEL="usb_net_by_mac_end"
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