/etc/libnl-3/classid is in libnl-3-200 3.2.21-1ubuntu4.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# ClassID <-> Name Translation Table
#
# This file can be used to assign names to classids for easier reference
# in all libnl tools.
#
# Format:
# <MAJ:> <NAME> # qdisc definition
# <MAJ:MIN> <NAME> # class deifnition
# <NAME:MIN> <NAME> # class definition referencing an
# existing qdisc definition.
#
# Example:
# 1: top # top -> 1:0
# top:1 interactive # interactive -> 1:1
# top:2 www # www -> 1:2
# top:3 bulk # bulk -> 1:3
# 2:1 test_class # test_class -> 2:1
#
# Illegal Example:
# 30:1 classD
# classD:2 invalidClass # classD refers to a class, not a qdisc
#
###############################################################################
# <CLASSID> <NAME>
# Reserved default classids
0:0 none
ffff:ffff root
ffff:fff1 ingress
#
# List your classid definitions here:
#
###############################################################################
# List of auto-generated classids
#
# DO NOT ADD CLASSID DEFINITIONS BELOW THIS LINE
#
# <CLASSID> <NAME>
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