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Annotation of 42BSD/etc/routed/timer.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)timer.c    4.4 (Berkeley) 6/1/83";
        !             3: #endif
        !             4: 
        !             5: /*
        !             6:  * Routing Table Management Daemon
        !             7:  */
        !             8: #include "defs.h"
        !             9: 
        !            10: int    timeval = -TIMER_RATE;
        !            11: 
        !            12: /*
        !            13:  * Timer routine.  Performs routing information supply
        !            14:  * duties and manages timers on routing table entries.
        !            15:  */
        !            16: timer()
        !            17: {
        !            18:        register struct rthash *rh;
        !            19:        register struct rt_entry *rt;
        !            20:        struct rthash *base = hosthash;
        !            21:        int doinghost = 1, timetobroadcast;
        !            22: 
        !            23:        timeval += TIMER_RATE;
        !            24:        if (lookforinterfaces && (timeval % CHECK_INTERVAL) == 0)
        !            25:                ifinit();
        !            26:        timetobroadcast = supplier && (timeval % SUPPLY_INTERVAL) == 0;
        !            27: again:
        !            28:        for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
        !            29:                rt = rh->rt_forw;
        !            30:                for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !            31:                        /*
        !            32:                         * We don't advance time on a routing entry for
        !            33:                         * a passive gateway or that for our only interface. 
        !            34:                         * The latter is excused because we don't act as
        !            35:                         * a routing information supplier and hence would
        !            36:                         * time it out.  This is fair as if it's down
        !            37:                         * we're cut off from the world anyway and it's
        !            38:                         * not likely we'll grow any new hardware in
        !            39:                         * the mean time.
        !            40:                         */
        !            41:                        if (!(rt->rt_state & RTS_PASSIVE) &&
        !            42:                            (supplier || !(rt->rt_state & RTS_INTERFACE)))
        !            43:                                rt->rt_timer += TIMER_RATE;
        !            44:                        if (rt->rt_timer >= EXPIRE_TIME)
        !            45:                                rt->rt_metric = HOPCNT_INFINITY;
        !            46:                        if (rt->rt_timer >= GARBAGE_TIME) {
        !            47:                                rt = rt->rt_back;
        !            48:                                rtdelete(rt->rt_forw);
        !            49:                                continue;
        !            50:                        }
        !            51:                        if (rt->rt_state & RTS_CHANGED) {
        !            52:                                rt->rt_state &= ~RTS_CHANGED;
        !            53:                                /* don't send extraneous packets */
        !            54:                                if (!supplier || timetobroadcast)
        !            55:                                        continue;
        !            56:                                msg->rip_cmd = RIPCMD_RESPONSE;
        !            57:                                msg->rip_vers = RIPVERSION;
        !            58:                                msg->rip_nets[0].rip_dst = rt->rt_dst;
        !            59:                                msg->rip_nets[0].rip_dst.sa_family =
        !            60:                                   htons(msg->rip_nets[0].rip_dst.sa_family);
        !            61:                                msg->rip_nets[0].rip_metric =
        !            62:                                   htonl(min(rt->rt_metric+1, HOPCNT_INFINITY));
        !            63:                                toall(sendmsg);
        !            64:                        }
        !            65:                }
        !            66:        }
        !            67:        if (doinghost) {
        !            68:                doinghost = 0;
        !            69:                base = nethash;
        !            70:                goto again;
        !            71:        }
        !            72:        if (timetobroadcast)
        !            73:                toall(supply);
        !            74:        alarm(TIMER_RATE);
        !            75: }

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