#include <linux/notifier.h>
#include <linux/inetdevice.h>

static int inet_callback(struct notifier_block *self,
    unsigned long val, void *data)
{
    printk("inet_callback: Val=%ld, IP Address=%x\n", val, 
        ntohl(((struct in_ifaddr *)data)->ifa_address));
    return NOTIFY_DONE;
}

static struct notifier_block inet_notifier = {
    .notifier_call = inet_callback,
};

static int __init inet_init (void)
{
    register_inetaddr_notifier(&inet_notifier);
    return 0;
}

static void __exit inet_exit(void)
{
    unregister_inetaddr_notifier(&inet_notifier);
}

module_init(inet_init);
module_exit(inet_exit);
MODULE_LICENSE("GPL");