rdtp - Reliable Data Transport Protocol

[IPPROTO_RDTP = 0x9D]

Specification of a reliable transport layer protocol to be used over IP networks, along a simplistic and modular implementation in Go.

To-Dos:

• Reliability
  • Polish socket dialer
  • Implement socket listener
  • Implement selective acknowledgements
• Flow Control
  • Receiver window in header

Based on:

• UDP - User Datagram Protocol [RFC]
• TCP - Transmission Control Protocol [RFC]

Header Format

 0      7 8     15 16    23 24    31
+--------+--------+--------+--------+
|     Src. Port   |    Dst. Port    |
+--------+--------+--------+--------+
|      Length     |    Checksum     |
+--------+--------+--------+--------+
|          Sequence Number          |
+--------+-----------------+--------+
|       Acknowledgement Number      |
+--------+-----------------+--------+
|  Flags |                          |
+--------+                          |
|             ( Data )              |
+               ....                +

Important Notes:

The value for the underlying IP header's "Protocol" field must be set to 0x9D (157 -- currently Unassigned)

Over the Wire

Here's a Wireshark capture of an RDTP packet over the wire:

(The highlighted bytes are the RDTP header + payload)