注册一个虚拟网络接口

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include

#define err(msg) printk(KERN_INFO "%s failed.\n", msg)

static struct net_device *netdev;
static struct net_device_stats stats;

static int netdev_open(struct net_device *dev)
{
    netif_start_queue(dev);
    printk(KERN_INFO "netdev_open back.\n");
    return 0;
}

static int netdev_stop(struct net_device *dev)
{
    netif_stop_queue(dev);
    printk(KERN_INFO "netdev_stop back.\n");
    return 0;
}

static struct net_device_stats * netdev_stats(struct net_device *dev)
{
    struct net_device_stats *p = netdev_priv(dev);
    printk(KERN_INFO "netdev_stats back.\n");
    return p;
}

static int netdev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
    printk(KERN_INFO "netdev_hard_start_xmit back.\n");

    if (skb)
        dev_kfree_skb_any(skb);

    return 0;
}

static int __init main_init(void)
{
    netdev = alloc_etherdev(sizeof(stats));
    if (netdev == NULL) {
        err("alloc_etherdev");
        goto out;
    }

    netdev->open         = netdev_open;
    netdev->stop         = netdev_stop;
    netdev->hard_start_xmit = netdev_hard_start_xmit;
    netdev->get_stats     = netdev_stats;
    memset(netdev->dev_addr, '\0', ETH_ALEN);

    if (register_netdev(netdev) != 0) {
        err("register_netdev");
        goto err;
    }

    printk(KERN_INFO "virtual network device register success.\n");
    return 0;
err:
    free_netdev(netdev);
out:
    return -1;
}

static void __exit main_exit(void)
{
    unregister_netdev(netdev);
    free_netdev(netdev);
    printk(KERN_INFO "virtual network device unregister success.\n");
}

module_init(main_init);
module_exit(main_exit);
MODULE_LICENSE("GPL");