TCP/IP stack

Create TCP/IP stack from scratch.

This is based on pandax381/microps.

tcp.c is based on RFC 793 - Transmission Control Protocol.

How to use

Use tap device on Linux on VirtualBox

# use brctl to create bridge
$ sudo apt install -y bridge-utils

# create br0 and connect it to eth1
$ sudo brctl addbr br0
$ sudo brctl addif br0 eth1
$ sudo ip link set br0 up
$ sudo ip addr add dev br0 192.168.33.12/24

# create apps/tcp_echo and test binary at /vagrant
$ cd /vagrant
$ make clean && make

# start tcp echo server
$ sudo apps/tcp_echo

# connect created tap1 device to br0
$ sudo brctl addif br0 tap2 && sudo ip link set tap2 up && sudo arp -d 192.168.33.13

# connect using telnet
$ telnet 192.168.33.13 20000

Features

• Raw Device
  • tap device on Linux
  • PF_PACKET socket on Linux
  • tap device on BSD
  • BFP on BSD
• Ethernet
• ARP
• IP
  • ip_tx
  • ip_rx
  • Fragmentation
  • Checksum
  • Routing
  • Packet Forwarding
  • Dynamic network device selection by IP Address
• ICMP
• DHCP
• TCP
  • Socket API (open, connect, bind, listen, accept, send, recv)
    • Blocking I/O API
    • Non-blocing I/O API
    • Event Driven Architecture API (like select, poll, epoll, kqueue...)
  • Timeout
    • User Timeout
    • Retransmission Timeout
    • TIME WAIT Timeout
  • Connection Control
    • Passive Open
      • Backlog
      • SYN-Backlog
    • Active Open
    • Close Connection
  • Send Data
    • Data Segmentation by MTU
    • Retransmission
    • Flow Control
    • Congestion Control
  • Receive Data
    • Reply ACK
    • Partial ACK
  • Sequential ID Rotation
  • URG Pointer
  • Precedence and Security
• UDP
• Payload Passing over layers with Zero Copy

Development on VSCode

I use macOS and create Ubuntu 18.04 VM using vagrant. I use VSCode as editor and Remote SSH plugin.

$ vagrant up
$ vagrant ssh-config > .ssh-config

Setup VSCode Remote SSH with .ssh-config and login. Then re-install VSCode plugins in remote VSCode.

LICENSE

MIT