Abstract:This paper introduces the framework, working theory and implementation mechanisms in kernel of the Linux firewall named Netfilter. Then it expounds the loading module mechanism of Linux, and analyzes the data structure of Linux module and their relationship, and how to program the kernel module and build it in Netfilter, in order to achieve the function expansion of firewall. The Linux firewall will be taken as an example to show how to implement module loading and unloading technology in Linux system.Key words:firewall; Iinux kernal; Netfilter ; Module Loading Technology
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