An GBN (Go Back N) protocol implementation based on Linux UDP.

Build up a connection-oriented and reliable data transmitting procedure, including three-way handshaking and four-way teardown.

基于 Linux UDP，实现回退 N 协议，建立面向连接的可靠的数据传输过程，包括建立连接（三次握手）和拆除连接（四次挥手）的过程。

TODO:

• There might be some problems about the procedure of Tearing down.