> All functions are checked right now and all functions can be NULL. 
> Check the patch #2 ...

This seems strange. What sort of routing protocol can you build, which
has a NULL receive function? Only static routes. I would perform the
check once in _register(), that there is a receive function, and never
check it again. Save yourself a few cycles. 

There is an LWN article about these ideas. Worth a read. I will post a
link later.

      Andrew

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