Implement custom network protocol for local processes

[Kfir Lavi]

Hi,
How can one implement custom header network protocol.
I mean header that wraps regular network packets like ethernet, udp, tcp,
etc...
The sending of this custom packets is done between processes running
locally.
ie. I get a Ethernet packet, inspect it, then add my custom header and
forward
it to another process that listens to a socket, and expect to get data
wrapped with
this custom header.

What is a good way to go about and implement this thing?

Thanks,
Kfir
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