This code implements a simple kernel level firewall based on netfilter, which can control IP routing, and is a good material for getting an introduction to netfilter. It is the source implementation of a kernel firwall

netfile内核级防火墙\app\Makefile
...................\...\sipfw
...................\...\sipfw_u.c
...................\module\Makefile
...................\......\run
...................\......\sipfw.conf
...................\......\sipfw.h
...................\......\sipfw_k.c
...................\......\sipfw_k_common.c
...................\......\sipfw_k_file.c
...................\......\sipfw_k_nl.c
...................\......\sipfw_k_proc.c
...................\......\sipfw_module.ko
...................\......\sipfw_para.h
...................\sipfw_k_test.c
...................\sipfw_u_test.c
...................\app
...................\module
netfile内核级防火墙

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