TCP/IP Stack Programming in Linux

I would recommend UNIX Network Programming - Networking APIs: Sockets and XTI, and UNIX Network Programming - Interprocess Communications both by (the late and great) W. Richard Stevens. They are big, thick, very detailed and have lots of example code. A list of his books are at
http://www.kohala.com/start/#books. None of them are especially for Linux, but they mostly apply except for where they don't. Good Luck.

Bob