hook-zz的几篇文章

http://blog.chinaunix.net/u3/98692/showart_2061020.html

http://blog.chinaunix.net/u3/94259/showart_1890147.html

http://www.netfilter.org/documentation/HOWTO/netfilter-hacking-HOWTO-3.html

http://blog.chinaunix.net/u/24896/showart_211278.html