Linux驱动4_NETFILTER
#include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/types.h> #include <linux/netdevice.h> #include <linux/skbuff.h> #include <linux/netfilter_ipv4.h> #include <linux/inet.h> #include <linux/in.h> #include <linux/ip.h> // hook函数 static unsigned int hook_func(unsigned int hooknum, struct sk_buff * skb, const struct net_device *in, const struct net_device *out, int (*okfn) (struct sk_buff *)) { unsigned int ret = NF_ACCEPT; if(!skb) { printk(KERN_ALERT "hook_func null skb.\n"); goto err_null_skb; } printk(KERN_ALERT "hook_func get a skb.\n"); return ret; err_null_skb: return ret; } struct nf_hook_ops hook_ops = { .list = {NULL,NULL}, .hook = hook_func, //hook的协议族 .pf = PF_INET, //接收到的包,路由之前的hook点 .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP_PRI_FILTER }; static int __init hook_init(void) { nf_register_hook(&hook_ops); return 0; } static void __exit hook_exit(void) { nf_unregister_hook(&hook_ops); } MODULE_LICENSE("GPL"); module_init(hook_init); module_exit(hook_exit);
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