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Annotation of 43BSDTahoe/etc/routed/timer.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983, 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that this notice is preserved and that due credit is given
        !             7:  * to the University of California at Berkeley. The name of the University
        !             8:  * may not be used to endorse or promote products derived from this
        !             9:  * software without specific prior written permission. This software
        !            10:  * is provided ``as is'' without express or implied warranty.
        !            11:  */
        !            12: 
        !            13: #ifndef lint
        !            14: static char sccsid[] = "@(#)timer.c    5.6 (Berkeley) 5/31/88";
        !            15: #endif /* not lint */
        !            16: 
        !            17: /*
        !            18:  * Routing Table Management Daemon
        !            19:  */
        !            20: #include "defs.h"
        !            21: 
        !            22: int    timeval = -TIMER_RATE;
        !            23: 
        !            24: /*
        !            25:  * Timer routine.  Performs routing information supply
        !            26:  * duties and manages timers on routing table entries.
        !            27:  */
        !            28: timer()
        !            29: {
        !            30:        register struct rthash *rh;
        !            31:        register struct rt_entry *rt;
        !            32:        struct rthash *base = hosthash;
        !            33:        int doinghost = 1, timetobroadcast, changes = 0;
        !            34:        extern int externalinterfaces;
        !            35:        time_t now;
        !            36: 
        !            37:        timeval += TIMER_RATE;
        !            38:        if (lookforinterfaces && (timeval % CHECK_INTERVAL) == 0)
        !            39:                ifinit();
        !            40:        timetobroadcast = supplier && (timeval % SUPPLY_INTERVAL) == 0;
        !            41: again:
        !            42:        for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
        !            43:                rt = rh->rt_forw;
        !            44:                for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !            45:                        /*
        !            46:                         * We don't advance time on a routing entry for
        !            47:                         * a passive gateway, or any interface if we're
        !            48:                         * not acting as supplier.
        !            49:                         */
        !            50:                        if (!(rt->rt_state & RTS_PASSIVE) &&
        !            51:                            (supplier || !(rt->rt_state & RTS_INTERFACE)))
        !            52:                                rt->rt_timer += TIMER_RATE;
        !            53:                        if (rt->rt_timer >= GARBAGE_TIME) {
        !            54:                                rt = rt->rt_back;
        !            55:                                rtdelete(rt->rt_forw);
        !            56:                                continue;
        !            57:                        }
        !            58:                        if (rt->rt_timer >= EXPIRE_TIME) {
        !            59:                                if (traceactions && changes++ == 0) {
        !            60:                                        (void) time(&now);
        !            61:                                        curtime = ctime(&now);
        !            62:                                }
        !            63:                                rtchange(rt, &rt->rt_router, HOPCNT_INFINITY);
        !            64:                        }
        !            65:                        if (rt->rt_state & RTS_CHANGED) {
        !            66:                                rt->rt_state &= ~RTS_CHANGED;
        !            67:                                /* don't send extraneous packets */
        !            68:                                if (!supplier || timetobroadcast)
        !            69:                                        continue;
        !            70:                                msg->rip_cmd = RIPCMD_RESPONSE;
        !            71:                                msg->rip_vers = RIPVERSION;
        !            72:                                msg->rip_nets[0].rip_dst = rt->rt_dst;
        !            73:                                msg->rip_nets[0].rip_dst.sa_family =
        !            74:                                   htons(msg->rip_nets[0].rip_dst.sa_family);
        !            75:                                msg->rip_nets[0].rip_metric =
        !            76:                                   htonl(min(rt->rt_metric, HOPCNT_INFINITY));
        !            77:                                toall(sendmsg);
        !            78:                        }
        !            79:                }
        !            80:        }
        !            81:        if (doinghost) {
        !            82:                doinghost = 0;
        !            83:                base = nethash;
        !            84:                goto again;
        !            85:        }
        !            86:        if (timetobroadcast)
        !            87:                toall(supply);
        !            88:        alarm(TIMER_RATE);
        !            89: }
        !            90: 
        !            91: /*
        !            92:  * On hangup, let everyone know we're going away.
        !            93:  */
        !            94: hup()
        !            95: {
        !            96:        register struct rthash *rh;
        !            97:        register struct rt_entry *rt;
        !            98:        struct rthash *base = hosthash;
        !            99:        int doinghost = 1;
        !           100: 
        !           101:        if (supplier) {
        !           102: again:
        !           103:                for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
        !           104:                        rt = rh->rt_forw;
        !           105:                        for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw)
        !           106:                                rt->rt_metric = HOPCNT_INFINITY;
        !           107:                }
        !           108:                if (doinghost) {
        !           109:                        doinghost = 0;
        !           110:                        base = nethash;
        !           111:                        goto again;
        !           112:                }
        !           113:                toall(supply);
        !           114:        }
        !           115:        exit(1);
        !           116: }

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