2.9BSD/usr/net/src/netser/routed/router.h

/*	router.h	4.10	82/06/10	*/

/*
 * Internal data structure definitions for
 * user routing process.  Based on Xerox NS
 * protocol specs with mods relevant to more
 * general addressing scheme.
 */
#include <net/route.h>

/*
 * An ``interface'' is similar to an ifnet structure,
 * except it doesn't contain q'ing info, and it also
 * handles ``logical'' interfaces (remote gateways
 * that we want to keep polling even if they go down).
 * The list of interfaces which we maintain is used
 * in supplying the gratuitous routing table updates.
 */
struct interface {
	struct	interface *int_next;
	struct	sockaddr int_addr;		/* address on this host */
	union {
		struct	sockaddr intu_broadaddr;
		struct	sockaddr intu_dstaddr;
	} int_intu;
#define	int_broadaddr	int_intu.intu_broadaddr	/* broadcast address */
#define	int_dstaddr	int_intu.intu_dstaddr	/* other end of p-to-p link */
	int	int_metric;			/* init's routing entry */
	int	int_flags;			/* see below */
	u_long	int_net;			/* network # */
};

/*
 * 0x1 to 0x10 are reused from the kernel's ifnet definitions,
 * the others agree with the RTS_ flags defined below
 */
#define	IFF_UP		0x1		/* interface is up */
#define	IFF_BROADCAST	0x2		/* broadcast address valid */
#define	IFF_DEBUG	0x4		/* turn on debugging */
#define	IFF_ROUTE	0x8		/* routing entry installed */
#define	IFF_POINTOPOINT	0x10		/* interface is point-to-point link */
#define	IFF_PASSIVE	0x20		/* can't tell if up/down */
#define	IFF_INTERFACE	0x40		/* hardware interface */
#define	IFF_REMOTE	0x80		/* interface isn't on this machine */

/*
 * Routing table structure; differs a bit from kernel tables.
 *
 * Note: the union below must agree in the first 4 members
 * so the ioctl's will work.
 */
struct rthash {
	struct	rt_entry *rt_forw;
	struct	rt_entry *rt_back;
};

struct rt_entry {
	struct	rt_entry *rt_forw;
	struct	rt_entry *rt_back;
	union {
		struct	rtentry rtu_rt;
		struct {
			u_long	rtu_hash;
			struct	sockaddr rtu_dst;
			struct	sockaddr rtu_router;
			char	rtu_flags;
			char	rtu_refcnt;
			short	rtu_state;
			int	rtu_timer;
			int	rtu_metric;
			struct	interface *rtu_ifp;
		} rtu_entry;
	} rt_rtu;
};

#define	rt_rt		rt_rtu.rtu_rt			/* pass to ioctl */
#define	rt_hash		rt_rtu.rtu_entry.rtu_hash	/* for net or host */
#define	rt_dst		rt_rtu.rtu_entry.rtu_dst	/* match value */
#define	rt_router	rt_rtu.rtu_entry.rtu_router	/* who to forward to */
#define	rt_flags	rt_rtu.rtu_entry.rtu_flags	/* kernel flags */
#define	rt_timer	rt_rtu.rtu_entry.rtu_timer	/* for invalidation */
#define	rt_state	rt_rtu.rtu_entry.rtu_state	/* see below */
#define	rt_metric	rt_rtu.rtu_entry.rtu_metric	/* cost of route */
#define	rt_ifp		rt_rtu.rtu_entry.rtu_ifp	/* interface to take */

#define	ROUTEHASHSIZ	19

/*
 * "State" of routing table entry.
 */
#define	RTS_CHANGED	0x1		/* route has been altered recently */
#define	RTS_PASSIVE	0x20		/* don't time out route */
#define	RTS_INTERFACE	0x40		/* route is for network interface */
#define	RTS_REMOTE	0x80		/* route is for ``remote'' entity */

struct	rthash nethash[ROUTEHASHSIZ], hosthash[ROUTEHASHSIZ];
struct	rt_entry *rtlookup(), *rtfind();

/*
 * Per address family routines.
 */
struct afswitch {
	int	(*af_hash)();		/* returns keys based on address */
	int	(*af_netmatch)();	/* verifies net # matching */
	int	(*af_output)();		/* interprets address for sending */
	int	(*af_portmatch)();	/* packet from some other router? */
	int	(*af_portcheck)();	/* packet from priviledged peer? */
	int	(*af_checkhost)();	/* tells if address for host or net */
	int	(*af_canon)();		/* canonicalize address for compares */
};

/*
 * Structure returned by af_hash routines.
 */
struct afhash {
	int	afh_hosthash;		/* host based hash */
	int	afh_nethash;		/* network based hash */
};

struct	afswitch afswitch[AF_MAX];	/* table proper */

/*
 * When we find any interfaces marked down we rescan the
 * kernel every CHECK_INTERVAL seconds to see if they've
 * come up.
 */
#define	CHECK_INTERVAL	(1*60)