/usr/lib/libpacketdump/ip_58.protocol is in libpacketdump3 3.0.21-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | be8 integer "ICMP6: Type"
be8 integer "ICMP6: Code"
be16 hex "ICMP6: Checksum"
next "icmp6" "ICMP6: Type"
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