usr/src/sbin/XNSrouted/protocol.h

/*
 * Copyright (c) 1985 The Regents of the University of California.
 * All rights reserved.
 *
 * This file includes significant work done at Cornell University by
 * Bill Nesheim.  That work included by permission.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, 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'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      @(#)protocol.h  5.5 (Berkeley) %G%
 */

/*
 * Xerox Routing Information Protocol
 *
 */

struct netinfo {
        union ns_net    rip_dst;                /* destination net */
        u_short         rip_metric;             /* cost of route */
};

struct rip {
        u_short rip_cmd;                /* request/response */
        struct netinfo rip_nets[1];     /* variable length */
};

/*
 * Packet types.
 */
#define RIPCMD_REQUEST          1       /* want info */
#define RIPCMD_RESPONSE         2       /* responding to request */

#define RIPCMD_MAX              3
#ifdef RIPCMDS
char *ripcmds[RIPCMD_MAX] =
  { "#0", "REQUEST", "RESPONSE" };
#endif

#define HOPCNT_INFINITY         16              /* per Xerox NS */
#define DSTNETS_ALL             0xffffffff      /* per Xerox NS */
#define MAXPACKETSIZE           512             /* max broadcast size */

extern union ns_net ns_anynet;
extern union ns_net ns_zeronet;

/*
 * Timer values used in managing the routing table.
 * Every update forces an entry's timer to be reset.  After
 * EXPIRE_TIME without updates, the entry is marked invalid,
 * but held onto until GARBAGE_TIME so that others may
 * see it "be deleted".
 */
#define TIMER_RATE              30      /* alarm clocks every 30 seconds */

#define SUPPLY_INTERVAL         30      /* time to supply tables */

#define EXPIRE_TIME             180     /* time to mark entry invalid */
#define GARBAGE_TIME            240     /* time to garbage collect */