/usr/lib/libpacketdump/link_3.protocol is in libpacketdump3v5 3.0.21-1ubuntu2.
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 | # ATM
le12 integer "ATM: VPI"
le16 integer "ATM: VCI"
le3 hex "ATM: Payload Type"
le1 flag "ATM: Cell loss priority"
be8 hex "LLC: DSAP"
be8 hex "LLC: SSAP"
be8 hex "LLC: Control"
be24 hex "SNAP: OUI"
be16 hex "SNAP: Type"
next "eth" "SNAP: Type"
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