ATN network stack implementation

Hi All,

Required some input for ATN network stack  implementation (IDRP, ES-IS, IS-IS, CLNP). I have following questions
1.	Is there any implementation already exist in open source  like IDRP or ES-IS etc 
2.	Is it feasible to implement in Linux kernel stack. I found some implementation "Oki Electric Industry Ground-Ground ATN Router for Linux" which is not open source
3.	Is there any advice or input or suggestion for me to start with 


Thanks
Prabhakar