How I can listen for a tcp port in kernel space (freebsd)?

As the title sa开发者_如何学Cys, How I can work with tcp sockets in kernel space? Is there any tricky notes?

Look at ng_ksocket. Even if you will not use netgraph, it is a nice implementation of kernel-level socket manipulation.

I found a post on linuxjournal.com about networking in kernel.

May be helpful.