warning: assignment from incompatible pointer type (注册hook时出现了)
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在<Linux/netfilter.h>中的钩子函数的签名是：
unsigned int nf_hookfn(unsigned int hooknum,struct sk_buff **skb, const struct net_device *in, const struct net_device *out, int (*okfn) (struct sk_buff *))
当我将nf_hookfn函数赋值给hook时，就出现了warning: assignment from incompatible pointer type的错误。
后来改为：
unsigned int nf_hookfn(unsigned int hooknum,struct sk_buff *skb, const struct net_device *in, const struct net_device *out, int (*okfn) (struct sk_buff *))编译通过。说明从kernel 2.6.*开始，函数的参数值变化了。
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