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Annotation of 43BSDReno/include/protocols/routed.h, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1983, 1989 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  *
        !            19:  *     @(#)routed.h    5.2 (Berkeley) 6/25/90
        !            20:  */
        !            21: 
        !            22: /*
        !            23:  * Routing Information Protocol
        !            24:  *
        !            25:  * Derived from Xerox NS Routing Information Protocol
        !            26:  * by changing 32-bit net numbers to sockaddr's and
        !            27:  * padding stuff to 32-bit boundaries.
        !            28:  */
        !            29: #define        RIPVERSION      1
        !            30: 
        !            31: struct netinfo {
        !            32:        struct  sockaddr rip_dst;       /* destination net/host */
        !            33:        int     rip_metric;             /* cost of route */
        !            34: };
        !            35: 
        !            36: struct rip {
        !            37:        u_char  rip_cmd;                /* request/response */
        !            38:        u_char  rip_vers;               /* protocol version # */
        !            39:        u_char  rip_res1[2];            /* pad to 32-bit boundary */
        !            40:        union {
        !            41:                struct  netinfo ru_nets[1];     /* variable length... */
        !            42:                char    ru_tracefile[1];        /* ditto ... */
        !            43:        } ripun;
        !            44: #define        rip_nets        ripun.ru_nets
        !            45: #define        rip_tracefile   ripun.ru_tracefile
        !            46: };
        !            47:  
        !            48: /*
        !            49:  * Packet types.
        !            50:  */
        !            51: #define        RIPCMD_REQUEST          1       /* want info */
        !            52: #define        RIPCMD_RESPONSE         2       /* responding to request */
        !            53: #define        RIPCMD_TRACEON          3       /* turn tracing on */
        !            54: #define        RIPCMD_TRACEOFF         4       /* turn it off */
        !            55: 
        !            56: #define        RIPCMD_MAX              5
        !            57: #ifdef RIPCMDS
        !            58: char *ripcmds[RIPCMD_MAX] =
        !            59:   { "#0", "REQUEST", "RESPONSE", "TRACEON", "TRACEOFF" };
        !            60: #endif
        !            61: 
        !            62: #define        HOPCNT_INFINITY         16      /* per Xerox NS */
        !            63: #define        MAXPACKETSIZE           512     /* max broadcast size */
        !            64: 
        !            65: /*
        !            66:  * Timer values used in managing the routing table.
        !            67:  * Complete tables are broadcast every SUPPLY_INTERVAL seconds.
        !            68:  * If changes occur between updates, dynamic updates containing only changes
        !            69:  * may be sent.  When these are sent, a timer is set for a random value
        !            70:  * between MIN_WAITTIME and MAX_WAITTIME, and no additional dynamic updates
        !            71:  * are sent until the timer expires.
        !            72:  *
        !            73:  * Every update of a routing entry forces an entry's timer to be reset.
        !            74:  * After EXPIRE_TIME without updates, the entry is marked invalid,
        !            75:  * but held onto until GARBAGE_TIME so that others may
        !            76:  * see it "be deleted".
        !            77:  */
        !            78: #define        TIMER_RATE              30      /* alarm clocks every 30 seconds */
        !            79: 
        !            80: #define        SUPPLY_INTERVAL         30      /* time to supply tables */
        !            81: #define        MIN_WAITTIME            2       /* min. interval to broadcast changes */
        !            82: #define        MAX_WAITTIME            5       /* max. time to delay changes */
        !            83: 
        !            84: #define        EXPIRE_TIME             180     /* time to mark entry invalid */
        !            85: #define        GARBAGE_TIME            240     /* time to garbage collect */

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