static int znet_open(struct net_device *dev);
static int znet_send_packet(struct sk_buff *skb, struct net_device *dev);
static int znet_open(struct net_device *dev);
static int znet_send_packet(struct sk_buff *skb, struct net_device *dev);
static void znet_rx(struct net_device *dev);
static int znet_close(struct net_device *dev);
static struct net_device_stats *net_get_stats(struct net_device *dev);
static void znet_rx(struct net_device *dev);
static int znet_close(struct net_device *dev);
static struct net_device_stats *net_get_stats(struct net_device *dev);