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

• [x] Raw Device
  • [x] tap device on Linux
  • [x] PF_PACKET socket on Linux
  • [ ] tap device on BSD
  • [ ] BFP on BSD
• [x] Ethernet
• [x] ARP
• [x] IP
  • [x] ip_tx
  • [x] ip_rx
  • [x] Fragmentation
  • [x] Checksum
  • [ ] Routing
  • [ ] Packet Forwarding
  • [ ] Dynamic network device selection by IP Address
• [ ] ICMP
• [ ] DHCP
• [x] TCP
  • [x] 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...)
  • [x] Timeout
    • [x] User Timeout
    • [x] Retransmission Timeout
    • [x] TIME WAIT Timeout
  • [x] Connection Control
    • [x] Passive Open
      • [x] Backlog
      • [ ] SYN-Backlog
    • [x] Active Open
    • [x] Close Connection
  • [x] Send Data
    • [x] Data Segmentation by MTU
    • [x] Retransmission
    • [x] Flow Control
    • [ ] Congestion Control
  • [x] Receive Data
    • [x] 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