IC697CBL803

IC697CBL803

要在VxWorks中實現(xiàn)NAT，必須實現(xiàn)兩個基本操作：IP數(shù)據(jù)包的截獲與IP數(shù)據(jù)包的偽裝處理。

　　對于VxWorks協(xié)議棧來講，NAT的存在是透明的。所以，要實現(xiàn)NAT的功能，必須在VxWorks網(wǎng)絡協(xié)議棧處理數(shù)據(jù)包之前截獲數(shù)據(jù)。要實現(xiàn)這一點，VxWorks為我們提供了兩類鉤子函數(shù)，截獲以太幀的EtherHook和截獲IP數(shù)據(jù)包的IpFilterHook。

　　其中EtherHook又包括EtherInputHook和EtherOutputHook，分別用來截獲接收和發(fā)送的以太幀。用戶可以通過EtherInputHookAdd和EtherOutputHookAdd來分別進行安裝。

　　而IpFilterHook提供對IP數(shù)據(jù)包的截獲，它只對應一個鉤子函數(shù)，用IpFilterHookAdd來進行安裝。當收到一個IP數(shù)據(jù)包的時候，IpFilterHook會被自動調用，從而達到對IP數(shù)據(jù)包截獲的目的。

　　對比兩種接口，EtherInputHookAdd將調用MuxBind去添加一個MUX_PROTO_SNARF協(xié)議，這樣可以得到進入MUX接口層的所有數(shù)據(jù)包。而由IpFilterHookAdd安裝的IpFilterHook，不屬于MUX接口層，僅僅用來截獲IP數(shù)據(jù)包，而不會接收到非IP數(shù)據(jù)包。

　　鑒于以上的區(qū)別，我們使用IpFilterHookAdd函數(shù)安裝的IpFilterHook來截獲IP數(shù)據(jù)包比較合適，參見圖2。

IC697CBL803

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