How to calculate the checksum for ICMPv6 protocol during fuzz testing?

boofuzz RawL2SocketConnection fuzz testing for ICMPv6 protocol, including the checksum part with the IPv6 pseudo-header (reference: RFC2460), as well as the entire ICMPv6 field. How can we dynamically calculate the checksum during fuzz testing?

_Originally posted by @newbing9527 in https://github.com/jtpereyda/boofuzz/discussions/716_