void addrouteforif(struct interface *ifp)
{
struct sockaddr_in net;
struct sockaddr *dst;
int state;
struct rt_entry *rt;
if (ifp->int_flags & IFF_POINTOPOINT)
dst = &ifp->int_dstaddr;
else {
memset(&net, 0, sizeof (net));
net.sin_family = AF_INET;
net.sin_addr = inet_makeaddr(ifp->int_subnet, INADDR_ANY);
dst = (struct sockaddr *)&net;
}
rt = rtfind(dst);
if (rt &&
(rt->rt_state & (RTS_INTERFACE | RTS_INTERNAL)) == RTS_INTERFACE)
return;
if (rt)
rtdelete(rt);
/*
* If interface on subnetted network,
* install route to network as well.
* This is meant for external viewers.
*/
if ((ifp->int_flags & (IFF_SUBNET|IFF_POINTOPOINT)) == IFF_SUBNET) {
struct in_addr subnet;
subnet = net.sin_addr;
net.sin_addr = inet_makeaddr(ifp->int_net, INADDR_ANY);
rt = rtfind(dst);
if (rt == 0)
rtadd(dst, &ifp->int_addr, ifp->int_metric,
((ifp->int_flags & (IFF_INTERFACE|IFF_REMOTE)) |
RTS_PASSIVE | RTS_INTERNAL | RTS_SUBNET));
else if ((rt->rt_state & (RTS_INTERNAL|RTS_SUBNET)) ==
(RTS_INTERNAL|RTS_SUBNET) &&
ifp->int_metric < rt->rt_metric)
rtchange(rt, &rt->rt_router, ifp->int_metric);
net.sin_addr = subnet;
}
if (ifp->int_transitions++ > 0)
syslog(LOG_ERR, "re-installing interface %s", ifp->int_name);
state = ifp->int_flags &
(IFF_INTERFACE | IFF_PASSIVE | IFF_REMOTE | IFF_SUBNET);
if (ifp->int_flags & IFF_POINTOPOINT &&
(ntohl(((struct sockaddr_in *)&ifp->int_dstaddr)->sin_addr.s_addr) &
ifp->int_netmask) != ifp->int_net)
state &= ~RTS_SUBNET;
if (ifp->int_flags & IFF_LOOPBACK)
state |= RTS_EXTERNAL;
rtadd(dst, &ifp->int_addr, ifp->int_metric, state);
if (ifp->int_flags & IFF_POINTOPOINT && foundloopback)
add_ptopt_localrt(ifp);
}
void timer(int signum)
{
register struct rthash *rh;
register struct rt_entry *rt;
struct rthash *base = hosthash;
int doinghost = 1, timetobroadcast;
(void)signum;
(void) gettimeofday(&now, (struct timezone *)NULL);
faketime += TIMER_RATE;
if (lookforinterfaces && (faketime % CHECK_INTERVAL) == 0)
ifinit();
timetobroadcast = supplier && (faketime % SUPPLY_INTERVAL) == 0;
again:
for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++) {
rt = rh->rt_forw;
for (; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
/*
* We don't advance time on a routing entry for
* a passive gateway, or any interface if we're
* not acting as supplier.
*/
if (!(rt->rt_state & RTS_PASSIVE) &&
(supplier || !(rt->rt_state & RTS_INTERFACE)))
rt->rt_timer += TIMER_RATE;
if (rt->rt_timer >= GARBAGE_TIME) {
rt = rt->rt_back;
rtdelete(rt->rt_forw);
continue;
}
if (rt->rt_timer >= EXPIRE_TIME &&
rt->rt_metric < HOPCNT_INFINITY)
rtchange(rt, &rt->rt_router, HOPCNT_INFINITY);
rt->rt_state &= ~RTS_CHANGED;
}
}
if (doinghost) {
doinghost = 0;
base = nethash;
goto again;
}
if (timetobroadcast) {
toall(supply, 0, (struct interface *)NULL);
lastbcast = now;
lastfullupdate = now;
needupdate = 0; /* cancel any pending dynamic update */
nextbcast.tv_sec = 0;
}
#ifdef EMBED
signal(signum, timer);
#endif
}