[pcap-ng-format] representing checksum offload in pcapng

[Stephen Hemminger]

Is there any proposed option for representing checksum offload
in an enhanced packet block?  This matters when packet is truncated
by snap length.

Maybe something that has ability to indicate good and bad checksum
for TCP, UDP, and SCTP. Could even do inner/outer checksums.
The default should be that if option is not present, that
means no checksum offload information is available and
the checksum status is unknown.