route

/* Routing Table Entries: */
struct route {
	IPaddr	rt_net;		/* network address for this route	*/
	IPaddr	rt_mask;	/* mask for this route			*/
	IPaddr	rt_gw;		/* next IP hop				*/
	u_short	rt_metric;	/* distance metric			*/
	u_short	rt_ifnum;	/* interface number			*/
	short	rt_key;		/* sort key				*/
	short	rt_ttl;		/* time to live	(seconds)		*/
	struct	route *rt_next;	/* next entry for this hash value	*/
/* stats */
	int	rt_refcnt;	/* current reference count		*/
	int	rt_usecnt;	/* total use count so far		*/
};