table.h

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C头文件 代码 · 共 109 行

/*
#ifndef lint
static	char	*sccsid = "@(#)table.h	4.1	(ULTRIX)	7/2/90";
#endif lint
*/
/************************************************************************
 *									*
 *			Copyright (c) 1984,1988 by			*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/
/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	table.h	5.4 (Berkeley) 5/28/87
 */

/*
 * Routing table management daemon.
 */

/*
 * 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;
			short	rtu_flags;
			short	rtu_state;
			int	rtu_timer;
			int	rtu_metric;
			int	rtu_ifmetric;
			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_ifmetric	rt_rtu.rtu_entry.rtu_ifmetric	/* cost of route if */
#define	rt_ifp		rt_rtu.rtu_entry.rtu_ifp	/* interface to take */

#define	ROUTEHASHSIZ	32		/* must be a power of 2 */
#define	ROUTEHASHMASK	(ROUTEHASHSIZ - 1)

/*
 * "State" of routing table entry.
 */
#define	RTS_CHANGED	0x1		/* route has been altered recently */
#define	RTS_EXTERNAL	0x2		/* extern info, not installed or sent */
#define	RTS_INTERNAL	0x4		/* internal route, not installed */
#define	RTS_PASSIVE	IFF_PASSIVE	/* don't time out route */
#define	RTS_INTERFACE	IFF_INTERFACE	/* route is for network interface */
#define	RTS_REMOTE	IFF_REMOTE	/* route is for ``remote'' entity */
#define	RTS_SUBNET	IFF_SUBNET	/* route is for network subnet */

/*
 * Flags are same as kernel, with this addition for af_rtflags:
 */
#define	RTF_SUBNET	0x8000		/* pseudo: route to subnet */

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