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Annotation of 43BSD/sys/net/route.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)route.h     7.1 (Berkeley) 6/4/86
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Kernel resident routing tables.
        !            11:  * 
        !            12:  * The routing tables are initialized when interface addresses
        !            13:  * are set by making entries for all directly connected interfaces.
        !            14:  */
        !            15: 
        !            16: /*
        !            17:  * A route consists of a destination address and a reference
        !            18:  * to a routing entry.  These are often held by protocols
        !            19:  * in their control blocks, e.g. inpcb.
        !            20:  */
        !            21: struct route {
        !            22:        struct  rtentry *ro_rt;
        !            23:        struct  sockaddr ro_dst;
        !            24: };
        !            25: 
        !            26: /*
        !            27:  * We distinguish between routes to hosts and routes to networks,
        !            28:  * preferring the former if available.  For each route we infer
        !            29:  * the interface to use from the gateway address supplied when
        !            30:  * the route was entered.  Routes that forward packets through
        !            31:  * gateways are marked so that the output routines know to address the
        !            32:  * gateway rather than the ultimate destination.
        !            33:  */
        !            34: struct rtentry {
        !            35:        u_long  rt_hash;                /* to speed lookups */
        !            36:        struct  sockaddr rt_dst;        /* key */
        !            37:        struct  sockaddr rt_gateway;    /* value */
        !            38:        short   rt_flags;               /* up/down?, host/net */
        !            39:        short   rt_refcnt;              /* # held references */
        !            40:        u_long  rt_use;                 /* raw # packets forwarded */
        !            41:        struct  ifnet *rt_ifp;          /* the answer: interface to use */
        !            42: };
        !            43: 
        !            44: #define        RTF_UP          0x1             /* route useable */
        !            45: #define        RTF_GATEWAY     0x2             /* destination is a gateway */
        !            46: #define        RTF_HOST        0x4             /* host entry (net otherwise) */
        !            47: #define        RTF_DYNAMIC     0x10            /* created dynamically (by redirect) */
        !            48: 
        !            49: /*
        !            50:  * Routing statistics.
        !            51:  */
        !            52: struct rtstat {
        !            53:        short   rts_badredirect;        /* bogus redirect calls */
        !            54:        short   rts_dynamic;            /* routes created by redirects */
        !            55:        short   rts_newgateway;         /* routes modified by redirects */
        !            56:        short   rts_unreach;            /* lookups which failed */
        !            57:        short   rts_wildcard;           /* lookups satisfied by a wildcard */
        !            58: };
        !            59: 
        !            60: #ifdef KERNEL
        !            61: #define        RTFREE(rt) \
        !            62:        if ((rt)->rt_refcnt == 1) \
        !            63:                rtfree(rt); \
        !            64:        else \
        !            65:                (rt)->rt_refcnt--;
        !            66: 
        !            67: #ifdef GATEWAY
        !            68: #define        RTHASHSIZ       64
        !            69: #else
        !            70: #define        RTHASHSIZ       8
        !            71: #endif
        !            72: #if    (RTHASHSIZ & (RTHASHSIZ - 1)) == 0
        !            73: #define RTHASHMOD(h)   ((h) & (RTHASHSIZ - 1))
        !            74: #else
        !            75: #define RTHASHMOD(h)   ((h) % RTHASHSIZ)
        !            76: #endif
        !            77: struct mbuf *rthost[RTHASHSIZ];
        !            78: struct mbuf *rtnet[RTHASHSIZ];
        !            79: struct rtstat  rtstat;
        !            80: #endif

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