usr/src/etc/routed/table.h

/*
 * Copyright (c) 1983 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.
 *
 *      @(#)table.h     5.5 (Berkeley) 2/16/88
 */

/*
 * 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();