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This is something I'd love to do. Do you have any resources for learning the background info? Everywhere I've looked just plugs in some TCP/socket library, but I think the real learning would come from _making_ the library itself.

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You mean instead of using the TCP stack included in the kernel, you want to write your own? You could use raw sockets (described in man 7 raw) for that (but note that they require elevated privilege). Use socket(PF_INET, SOCK_RAW, IPPROTO_TCP) to get a raw TCP socket, then send and receive TCP packets as raw bytes over the socket.

I found an example demonstrating the approach here: http://www.tenouk.com/Module43a.html

Here's one of three parts on coding your own TCP/IP stack. I haven't gotten around to it, but it looks solid.

http://www.saminiir.com/lets-code-tcp-ip-stack-1-ethernet-ar...

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