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IC697CBL811
要在VxWorks中實(shí)現(xiàn)NAT，必須實(shí)現(xiàn)兩個(gè)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(duì)于VxWorks協(xié)議棧來講，NAT的存在是透明的。所以，要實(shí)現(xiàn)NAT的功能，必須在VxWorks網(wǎng)絡(luò)協(xié)議棧處理數(shù)據(jù)包之前截獲數(shù)據(jù)。要實(shí)現(xiàn)這一點(diǎn)，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(jìn)行安裝。
而IpFilterHook提供對(duì)IP數(shù)據(jù)包的截獲，它只對(duì)應(yīng)一個(gè)鉤子函數(shù)，用IpFilterHookAdd來進(jìn)行安裝。當(dāng)收到一個(gè)IP數(shù)據(jù)包的時(shí)候，IpFilterHook會(huì)被自動(dòng)調(diào)用，從而達(dá)到對(duì)IP數(shù)據(jù)包截獲的目的。
對(duì)比兩種接口，EtherInputHookAdd將調(diào)用MuxBind去添加一個(gè)MUX_PROTO_SNARF協(xié)議，這樣可以得到進(jìn)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(huì)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。
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