Linux实现Cisco风格的NAT(3)

static const struct file_operations proc_snat_operations = {
 .read  = read_snat,
 .write  = write_snat,
};
static const struct file_operations proc_dnat_operations = {
 .read  = read_dnat,
 .write  = write_dnat,
};

static int __init static_nat_zy_init(void)
{
 int ret = 0;
 ret = nf_register_hooks(ipv4_static_nat, ARRAY_SIZE(ipv4_static_nat));
 if (ret < 0) {
  printk("ipv4_static_nat: can't register hooks.\n");
 } /* test */else {
  nat_entry = proc_mkdir("STATIC_Nat", NULL);
  proc_create("source", S_IWUSR, nat_entry, &proc_snat_operations);
  proc_create("destination", S_IWUSR, nat_entry, &proc_dnat_operations);
 } 
 
 return ret;
}

static void __exit static_nat_zy_exit(void)
{
 
 remove_proc_entry("source", nat_entry);
 remove_proc_entry("destination", nat_entry);
 remove_proc_entry("STATIC_Nat", NULL);
 nf_unregister_hooks(ipv4_static_nat, ARRAY_SIZE(ipv4_static_nat));
 return;
}

module_init(static_nat_zy_init);
module_exit(static_nat_zy_exit);
//保留原作者
MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>");
MODULE_AUTHOR("wangran <marywangran@126.com>");
MODULE_DESCRIPTION("Static NAT");
MODULE_LICENSE("GPL");

如此就可以实现Cisoc风格的NAT了。代码的优化空间还是有很多的，比如list可以换成hash...