Quick Syscall question

[Eric Bambach <eric@cisu.net>]

Hello,

	This may seem like a silly question, however we were all beginning 
programmers once ;)

	I want to do some manipulating of network interfaces and routing and such. I 
am reading through some of the linux net sources but am confused on what are 
internal, kernel-only functions and what are externally visable syscalls. How 
can I tell from the source what is user-space visable that I can hook into 
and what is intternel stuff? Should I just be looking at headers or do I have 
to delve into the .c sources? I can do either, I just need a pointer on where 
to start and what I should be looking for.

Thanks
-- 

-EB