void sppp_attach (struct ppp_device *pd);
void sppp_detach (struct net_device *dev);
-void sppp_input (struct net_device *dev, struct sk_buff *m);
int sppp_do_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd);
struct sk_buff *sppp_dequeue (struct net_device *dev);
int sppp_isempty (struct net_device *dev);