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route.h
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1992-07-29
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/*
* Mach Operating System
* Copyright (c) 1987 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
* the terms and conditions for use and redistribution.
*/
/*
* Copyright (c) 1980, 1986 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*
* @(#)route.h 7.3 (Berkeley) 12/30/87
*/
/*
* Kernel resident routing tables.
*
* The routing tables are initialized when interface addresses
* are set by making entries for all directly connected interfaces.
*/
/*
* A route consists of a destination address and a reference
* to a routing entry. These are often held by protocols
* in their control blocks, e.g. inpcb.
*/
struct route {
struct rtentry *ro_rt;
struct sockaddr ro_dst;
};
/*
* We distinguish between routes to hosts and routes to networks,
* preferring the former if available. For each route we infer
* the interface to use from the gateway address supplied when
* the route was entered. Routes that forward packets through
* gateways are marked so that the output routines know to address the
* gateway rather than the ultimate destination.
*/
struct rtentry {
u_long rt_hash; /* to speed lookups */
struct sockaddr rt_dst; /* key */
struct sockaddr rt_gateway; /* value */
short rt_flags; /* up/down?, host/net */
short rt_refcnt; /* # held references */
u_long rt_use; /* raV&packets forwarded */
struct ifnet *rt_ifp; /* the answer: interface to use */
};
#define RTF_UP 0x1 /* route useable */
#define RTF_GATEWAY 0x2 /* destination is a gateway */
#define RTF_HOST 0x4 /* host entry (net otherwise) */
#define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
#define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
/*
* Routing statistics.
*/
struct rtstat {
short rts_badredirect; /* bogus redirect calls */
short rts_dynamic; /* routes created by redirects */
short rts_newgateway; /* routes modified by redirects */
short rts_unreach; /* lookups which failed */
short rts_wildcard; /* lookups satisfied by a wildcard */
};
#ifdef KERNEL
#define RTFREE(rt) \
if ((rt)->rt_refcnt == 1) \
rtfree(rt); \
else \
(rt)->rt_refcnt--;
#ifdef GATEWAY
#define RTHASHSIZ 64
#else
#define RTHASHSIZ 8
#endif
#if (RTHASHSIZ & (RTHASHSIZ - 1)) == 0
#define RTHASHMOD(h) ((h) & (RTHASHSIZ - 1))
#else
#define RTHASHMOD(h) ((h) % RTHASHSIZ)
#endif
struct mbuf *rthost[RTHASHSIZ];
struct mbuf *rtnet[RTHASHSIZ];
struct rtstat rtstat;
#endif