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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)timer.c    5.3 (Berkeley) 11/20/85";
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12:  * Routing Table Management Daemon
        !            13:  */
        !            14: #include "defs.h"
        !            15: 
        !            16: int    timeval = -TIMER_RATE;
        !            17: 
        !            18: /*
        !            19:  * Timer routine.  Performs routing information supply
        !            20:  * duties and manages timers on routing table entries.
        !            21:  */
        !            22: timer()
        !            23: {
        !            24:        register struct rthash *rh;
        !            25:        register struct rt_entry *rt;
        !            26:        struct rthash *base = hosthash;
        !            27:        int doinghost = 1, timetobroadcast;
        !            28:        extern int externalinterfaces;
        !            29: 
        !            30:        timeval += TIMER_RATE;
        !            31:        if (lookforinterfaces && (timeval % CHECK_INTERVAL) == 0)
        !            32:                ifinit();
        !            33:        timetobroadcast = supplier && (timeval % SUPPLY_INTERVAL) == 0;
        !            34: again:
        !            35:        for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
        !            36:                rt = rh->rt_forw;
        !            37:                for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
        !            38:                        /*
        !            39:                         * We don't advance time on a routing entry for
        !            40:                         * a passive gateway, or any interface if we're
        !            41:                         * not acting as supplier.
        !            42:                         */
        !            43:                        if (!(rt->rt_state & RTS_PASSIVE) &&
        !            44:                            (supplier || !(rt->rt_state & RTS_INTERFACE)))
        !            45:                                rt->rt_timer += TIMER_RATE;
        !            46:                        if (rt->rt_timer >= EXPIRE_TIME)
        !            47:                                rt->rt_metric = HOPCNT_INFINITY;
        !            48:                        if (rt->rt_timer >= GARBAGE_TIME) {
        !            49:                                rt = rt->rt_back;
        !            50:                                rtdelete(rt->rt_forw);
        !            51:                                continue;
        !            52:                        }
        !            53:                        if (rt->rt_state & RTS_CHANGED) {
        !            54:                                rt->rt_state &= ~RTS_CHANGED;
        !            55:                                /* don't send extraneous packets */
        !            56:                                if (!supplier || timetobroadcast)
        !            57:                                        continue;
        !            58:                                msg->rip_cmd = RIPCMD_RESPONSE;
        !            59:                                msg->rip_vers = RIPVERSION;
        !            60:                                msg->rip_nets[0].rip_dst = rt->rt_dst;
        !            61:                                msg->rip_nets[0].rip_dst.sa_family =
        !            62:                                   htons(msg->rip_nets[0].rip_dst.sa_family);
        !            63:                                msg->rip_nets[0].rip_metric =
        !            64:                                   htonl(min(rt->rt_metric+1, HOPCNT_INFINITY));
        !            65:                                toall(sendmsg);
        !            66:                        }
        !            67:                }
        !            68:        }
        !            69:        if (doinghost) {
        !            70:                doinghost = 0;
        !            71:                base = nethash;
        !            72:                goto again;
        !            73:        }
        !            74:        if (timetobroadcast)
        !            75:                toall(supply);
        !            76:        alarm(TIMER_RATE);
        !            77: }
        !            78: 
        !            79: /*
        !            80:  * On hangup, let everyone know we're going away.
        !            81:  */
        !            82: hup()
        !            83: {
        !            84:        register struct rthash *rh;
        !            85:        register struct rt_entry *rt;
        !            86:        struct rthash *base = hosthash;
        !            87:        int doinghost = 1;
        !            88: 
        !            89:        if (supplier) {
        !            90: again:
        !            91:                for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
        !            92:                        rt = rh->rt_forw;
        !            93:                        for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw)
        !            94:                                rt->rt_metric = HOPCNT_INFINITY;
        !            95:                }
        !            96:                if (doinghost) {
        !            97:                        doinghost = 0;
        !            98:                        base = nethash;
        !            99:                        goto again;
        !           100:                }
        !           101:                toall(supply);
        !           102:        }
        !           103:        exit(1);
        !           104: }

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