projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 5ff67f98 DF |
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 | ||
| 5919db1b | 7 | #ifndef lint |
| 88709531 | 8 | static char sccsid[] = "@(#)timer.c 5.4 (Berkeley) %G%"; |
| 5ff67f98 | 9 | #endif not lint |
| 5919db1b SL |
10 | |
| 11 | /* | |
| 12 | * Routing Table Management Daemon | |
| 13 | */ | |
| 7fe7fe74 | 14 | #include "defs.h" |
| 5919db1b SL |
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; | |
| 604bfd52 | 28 | extern int externalinterfaces; |
| 5919db1b SL |
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 | |
| 4ff053a6 MK |
40 | * a passive gateway, or any interface if we're |
| 41 | * not acting as supplier. | |
| 5919db1b SL |
42 | */ |
| 43 | if (!(rt->rt_state & RTS_PASSIVE) && | |
| 4ff053a6 | 44 | (supplier || !(rt->rt_state & RTS_INTERFACE))) |
| 5919db1b | 45 | rt->rt_timer += TIMER_RATE; |
| 5919db1b SL |
46 | if (rt->rt_timer >= GARBAGE_TIME) { |
| 47 | rt = rt->rt_back; | |
| 48 | rtdelete(rt->rt_forw); | |
| 49 | continue; | |
| 50 | } | |
| 88709531 MK |
51 | if (rt->rt_timer >= EXPIRE_TIME) |
| 52 | rtchange(rt, &rt->rt_router, HOPCNT_INFINITY); | |
| 5919db1b SL |
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; | |
| 55d340a4 | 59 | msg->rip_vers = RIPVERSION; |
| 5919db1b | 60 | msg->rip_nets[0].rip_dst = rt->rt_dst; |
| 55d340a4 SL |
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 = | |
| 88709531 MK |
64 | htonl(min(rt->rt_metric + rt->rt_ifmetric, |
| 65 | HOPCNT_INFINITY)); | |
| 5919db1b SL |
66 | toall(sendmsg); |
| 67 | } | |
| 68 | } | |
| 69 | } | |
| 70 | if (doinghost) { | |
| 71 | doinghost = 0; | |
| 72 | base = nethash; | |
| 73 | goto again; | |
| 74 | } | |
| 75 | if (timetobroadcast) | |
| 76 | toall(supply); | |
| 77 | alarm(TIMER_RATE); | |
| 78 | } | |
| b7e4f8be MK |
79 | |
| 80 | /* | |
| 81 | * On hangup, let everyone know we're going away. | |
| 82 | */ | |
| 83 | hup() | |
| 84 | { | |
| 85 | register struct rthash *rh; | |
| 86 | register struct rt_entry *rt; | |
| 87 | struct rthash *base = hosthash; | |
| 88 | int doinghost = 1; | |
| 89 | ||
| 90 | if (supplier) { | |
| 91 | again: | |
| 92 | for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) { | |
| 93 | rt = rh->rt_forw; | |
| 94 | for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) | |
| 95 | rt->rt_metric = HOPCNT_INFINITY; | |
| 96 | } | |
| 97 | if (doinghost) { | |
| 98 | doinghost = 0; | |
| 99 | base = nethash; | |
| 100 | goto again; | |
| 101 | } | |
| 102 | toall(supply); | |
| 103 | } | |
| 104 | exit(1); | |
| 105 | } |