/lib/udev/rules.d/77-nm-olpc-mesh.rules is in network-manager 0.9.8.8-0ubuntu7.
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 | # do not edit this file, it will be overwritten on update
# The fact that this device is driven by libertas is not currently exposed
# in the sysfs tree..?
KERNEL=="msh*", SUBSYSTEM=="net", DRIVERS=="usb", ATTRS{idVendor}=="1286", ATTRS{idProduct}=="2001", ENV{ID_NM_OLPC_MESH}="1"
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