usr/src/sbin/routed/defs.h

/*      defs.h  4.1     82/05/22        */

/*
 * Internal data structure definitions for
 * user routing process.  Based on Xerox NS
 * protocol specs with mods relevant to more
 * general addressing scheme.
 */

/*
 * Internal routing table structure.
 * Differs a bit from kernel tables.
 */
struct rt_hash {
        struct  rt_entry *rt_forw;
        struct  rt_entry *rt_back;
};

struct rt_entry {
        struct  rt_entry *rt_forw;
        struct  rt_entry *rt_back;
        u_long  rt_hash;                /* for net or for host */
        struct  sockaddr rt_dst;        /* match value */
        struct  sockaddr rt_gateway;    /* who to forward to */
        short   rt_flags;               /* see below */
        short   rt_retry;               /* # ioctl retries */
        int     rt_timer;               /* for invalidation */
        int     rt_metric;              /* hop count of route */
        struct  ifnet *rt_ifp;          /* corresponding interface */
};

#define ROUTEHASHSIZ    19

/*
 * Flags used by routing process are not
 * interpreted by kernel.
 */
#define RTF_DELRT       0x8             /* delete pending */
#define RTF_CHGRT       0x10            /* change command pending */
#define RTF_ADDRT       0x20            /* add command pending */
#define RTF_SILENT      0x40            /* don't send to router */

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

/*
 * Per address family routines.  Hash returns hash key based
 * on address; netmatch verifies net # matching, output interprets
 * an address in preparation for sending; portmatch interprets
 * an address in verifying incoming packets were sent from the
 * appropriate port; checkhost is used to decide whether an
 * address is for a host, or for a network (e.g. broadcast);
 * canon purges any extraneous stuff from a sender's address
 * before pattern matching is performed (e.g. Internet ports).
 */
struct afswitch {
        int     (*af_hash)();
        int     (*af_netmatch)();
        int     (*af_output)();
        int     (*af_portmatch)();
        int     (*af_checkhost)();
        int     (*af_canon)();
};

struct afhash {
        u_int   afh_hosthash;
        u_int   afh_nethash;
};

struct  afswitch afswitch[AF_MAX];