BoManev/rusty-tcp

:crab: TCP (RFC793) implemenation in Rust

Intro

Use [TUN/TAP]{https://www.kernel.org/doc/Documentation/networking/tuntap.txt} to create a "user-space" network. This allows our user-space TCP to forward and receive packets thru the kernel. Just opening a raw socket, with libpnet, will allow the kernel networking stack, including TCP, to process packets, which could interfere with our TCP implementation.

Tips

# This gives network admin priviliges to process running the TCP stack.
sudo setcap cap_net_admin=eip target/release/rusty-tcp

# Terminal packet analyzer
tshark -i tun0

# TCP client
nc 192.168.0.2 80

Resources

• [TRANSMISSION CONTROL PROTOCOL (RFC793)]{https://www.ietf.org/rfc/rfc793.txt}
• [A TCP/IP Tutorial (RFC1180)]{https://www.rfc-editor.org/rfc/rfc1180}
• [Ether Type]{https://en.wikipedia.org/wiki/EtherType}
  • 0x0800 Internet Protocol version 4 (IPv4)
  • 0x86DD Internet Protocol Version 6 (IPv6)
• [Protocol Numbers]{https://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml}
  • 1 ICMP Internet Control Message
  • 6 TCP Transmission Control