> 1) Is it possible to write a new protocol for linux with an out of
> tree module without modifing socket.h file?

I think this has been already tried in the following code.

http://lxr.free-electrons.com/source/include/net/bluetooth/bluetooth.h#L36

http://lxr.free-electrons.com/source/include/linux/socket.h#L239

The challenge is to expose this development specific header file to userspace.
The following document talks about that.

http://kernelnewbies.org/KernelHeaders

Regards

Manoj Nayak

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