This seems close to what you're asking for: https://github.com/smoltcp-rs/smoltcp https://github.com/smoltcp-rs/smoltcp A small-ish tcp/ip stack, in rust, that

This seems close to what you're asking for: https://github.com/smoltcp-rs/smoltcp https://github.com/smoltcp-rs/smoltcp A small-ish tcp/ip stack, in rust, that can use TAP so you're down in the weeds making the packets.