Using hook of Netfilter mechanism as entrance of called process function,to integrate IP with IPSec protocol is realizated by calling IPSec data process module in the IP processing procedure of data.

• 采用Netfilter机制的钩子点作为调用处理函数的入口，在数据的IP处理过程中调用IPSec处理模块实现IPSec协议与IP协议的整合。