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Annotation of 43BSDTahoe/etc/XNSrouted/timer.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1985 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:  * Includes material written at Cornell University by Bill Nesheim,
                      7:  * by permission of the author.
                      8:  */
                      9: 
                     10: 
                     11: #ifndef lint
                     12: static char sccsid[] = "@(#)timer.c    5.4 (Berkeley) 2/14/86";
                     13: #endif not lint
                     14: 
                     15: /*
                     16:  * Routing Table Management Daemon
                     17:  */
                     18: #include "defs.h"
                     19: 
                     20: int    timeval = -TIMER_RATE;
                     21: 
                     22: /*
                     23:  * Timer routine.  Performs routing information supply
                     24:  * duties and manages timers on routing table entries.
                     25:  */
                     26: timer()
                     27: {
                     28:        register struct rthash *rh;
                     29:        register struct rt_entry *rt;
                     30:        struct rthash *base = hosthash;
                     31:        int doinghost = 1, timetobroadcast;
                     32: 
                     33:        timeval += TIMER_RATE;
                     34:        if (lookforinterfaces && (timeval % CHECK_INTERVAL) == 0)
                     35:                ifinit();
                     36:        timetobroadcast = supplier && (timeval % SUPPLY_INTERVAL) == 0;
                     37: again:
                     38:        for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
                     39:                rt = rh->rt_forw;
                     40:                for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
                     41:                        /*
                     42:                         * We don't advance time on a routing entry for
                     43:                         * a passive gateway or that for our only interface. 
                     44:                         * The latter is excused because we don't act as
                     45:                         * a routing information supplier and hence would
                     46:                         * time it out.  This is fair as if it's down
                     47:                         * we're cut off from the world anyway and it's
                     48:                         * not likely we'll grow any new hardware in
                     49:                         * the mean time.
                     50:                         */
                     51:                        if (!(rt->rt_state & RTS_PASSIVE) &&
                     52:                            (supplier || !(rt->rt_state & RTS_INTERFACE)))
                     53:                                rt->rt_timer += TIMER_RATE;
                     54:                        if (rt->rt_timer >= EXPIRE_TIME)
                     55:                                rt->rt_metric = HOPCNT_INFINITY;
                     56:                        if (rt->rt_timer >= GARBAGE_TIME) {
                     57:                                rt = rt->rt_back;
                     58:                                /* Perhaps we should send a REQUEST for this route? */
                     59:                                rtdelete(rt->rt_forw);
                     60:                                continue;
                     61:                        }
                     62:                        if (rt->rt_state & RTS_CHANGED) {
                     63:                                rt->rt_state &= ~RTS_CHANGED;
                     64:                                /* don't send extraneous packets */
                     65:                                if (!supplier || timetobroadcast)
                     66:                                        continue;
                     67:                                msg->rip_cmd = htons(RIPCMD_RESPONSE);
                     68:                                msg->rip_nets[0].rip_dst =
                     69:                                        (satons_addr(rt->rt_dst)).x_net;
                     70:                                msg->rip_nets[0].rip_metric =
                     71:                                        htons(min(rt->rt_metric+1, HOPCNT_INFINITY));
                     72:                                toall(sendmsg);
                     73:                        }
                     74:                }
                     75:        }
                     76:        if (doinghost) {
                     77:                doinghost = 0;
                     78:                base = nethash;
                     79:                goto again;
                     80:        }
                     81:        if (timetobroadcast)
                     82:                toall(supply);
                     83:        alarm(TIMER_RATE);
                     84: }
                     85: 
                     86: /*
                     87:  * On hangup, let everyone know we're going away.
                     88:  */
                     89: hup()
                     90: {
                     91:        register struct rthash *rh;
                     92:        register struct rt_entry *rt;
                     93:        struct rthash *base = hosthash;
                     94:        int doinghost = 1;
                     95: 
                     96:        if (supplier) {
                     97: again:
                     98:                for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
                     99:                        rt = rh->rt_forw;
                    100:                        for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw)
                    101:                                rt->rt_metric = HOPCNT_INFINITY;
                    102:                }
                    103:                if (doinghost) {
                    104:                        doinghost = 0;
                    105:                        base = nethash;
                    106:                        goto again;
                    107:                }
                    108:                toall(supply);
                    109:        }
                    110:        exit(1);
                    111: }

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