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Annotation of 42BSD/etc/routed/protocol.h, revision 1.1.1.1

1.1       root        1: /*     protocol.h      4.10    83/08/11        */
                      2: /*
                      3:  * Routing Information Protocol
                      4:  *
                      5:  * Derived from Xerox NS Routing Information Protocol
                      6:  * by changing 32-bit net numbers to sockaddr's and
                      7:  * padding stuff to 32-bit boundaries.
                      8:  */
                      9: #define        RIPVERSION      1
                     10: 
                     11: struct netinfo {
                     12:        struct  sockaddr rip_dst;       /* destination net/host */
                     13:        int     rip_metric;             /* cost of route */
                     14: };
                     15: 
                     16: struct rip {
                     17:        u_char  rip_cmd;                /* request/response */
                     18:        u_char  rip_vers;               /* protocol version # */
                     19:        u_char  rip_res1[2];            /* pad to 32-bit boundary */
                     20:        union {
                     21:                struct  netinfo ru_nets[1];     /* variable length... */
                     22:                char    ru_tracefile[1];        /* ditto ... */
                     23:        } ripun;
                     24: #define        rip_nets        ripun.ru_nets
                     25: #define        rip_tracefile   ripun.ru_tracefile
                     26: };
                     27:  
                     28: /*
                     29:  * Packet types.
                     30:  */
                     31: #define        RIPCMD_REQUEST          1       /* want info */
                     32: #define        RIPCMD_RESPONSE         2       /* responding to request */
                     33: #define        RIPCMD_TRACEON          3       /* turn tracing on */
                     34: #define        RIPCMD_TRACEOFF         4       /* turn it off */
                     35: 
                     36: #define        RIPCMD_MAX              5
                     37: #ifdef RIPCMDS
                     38: char *ripcmds[RIPCMD_MAX] =
                     39:   { "#0", "REQUEST", "RESPONSE", "TRACEON", "TRACEOFF" };
                     40: #endif
                     41: 
                     42: #define        HOPCNT_INFINITY         16      /* per Xerox NS */
                     43: #define        MAXPACKETSIZE           512     /* max broadcast size */
                     44: 
                     45: /*
                     46:  * Timer values used in managing the routing table.
                     47:  * Every update forces an entry's timer to be reset.  After
                     48:  * EXPIRE_TIME without updates, the entry is marked invalid,
                     49:  * but held onto until GARBAGE_TIME so that others may
                     50:  * see it "be deleted".
                     51:  */
                     52: #define        TIMER_RATE              30      /* alarm clocks every 30 seconds */
                     53: 
                     54: #define        SUPPLY_INTERVAL         30      /* time to supply tables */
                     55: 
                     56: #define        EXPIRE_TIME             180     /* time to mark entry invalid */
                     57: #define        GARBAGE_TIME            240     /* time to garbage collect */

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