/* ARGSNOTUSED */
void
kev_dispatch_msg(int fd, short event, void *bula)
{
char buf[RT_BUF_SIZE];
char *next, *lim;
ssize_t n;
struct rt_msghdr *rtm;
struct if_msghdr ifm;
struct iface *iface;
if ((n = read(kev_state.fd, &buf, sizeof(buf))) == -1)
fatal("kev_dispatch_rtmsg: read error");
if (n == 0)
fatalx("kernel event socket closed");
lim = buf + n;
for (next = buf; next < lim; next += rtm->rtm_msglen) {
memcpy(&ifm, next, sizeof(ifm));
rtm = (struct rt_msghdr *)next;
if (rtm->rtm_version != RTM_VERSION)
continue;
iface = if_find_index(ifm.ifm_index);
if (iface == NULL) /* this interface isn't configured */
continue;
switch (rtm->rtm_type) {
case RTM_IFINFO:
log_debug("RTM_IFINFO");
if (LINK_STATE_IS_UP(ifm.ifm_data.ifi_link_state))
if_fsm(iface, IF_EVT_UP);
else
if_fsm(iface, IF_EVT_DOWN);
break;
case RTM_IFANNOUNCE:
log_debug("RTM_IFANNOUNCE");
break;
case RTM_NEWADDR:
/* TODO */
log_debug("RTM_NEWADDR");
break;
case RTM_DELADDR:
/* TODO */
log_debug("RTM_DELADDR");
break;
default:
/* ignore for now */
break;
}
}
}
int
rde_check_route(struct rip_route *e)
{
struct timeval tv, now;
struct rt_node *rn;
struct iface *iface;
u_int8_t metric;
if ((e->nexthop.s_addr & htonl(IN_CLASSA_NET)) ==
htonl(INADDR_LOOPBACK & IN_CLASSA_NET) ||
e->nexthop.s_addr == INADDR_ANY)
return (-1);
if ((iface = if_find_index(e->ifindex)) == NULL)
return (-1);
metric = MIN(INFINITY, e->metric + iface->cost);
if ((rn = rt_find(e->address.s_addr, e->mask.s_addr)) == NULL) {
if (metric >= INFINITY)
return (0);
rn = rt_new_rr(e, metric);
rt_insert(rn);
rde_send_change_kroute(rn);
route_start_timeout(rn);
triggered_update(rn);
} else {
/*
* XXX don't we have to track all incoming routes?
* what happens if the kernel route is removed later.
*/
if (rn->flags & F_KERNEL)
return (0);
if (metric < rn->metric) {
rn->metric = metric;
rn->nexthop.s_addr = e->nexthop.s_addr;
rn->ifindex = e->ifindex;
rde_send_change_kroute(rn);
triggered_update(rn);
} else if (e->nexthop.s_addr == rn->nexthop.s_addr &&
metric > rn->metric) {
rn->metric = metric;
rde_send_change_kroute(rn);
triggered_update(rn);
if (rn->metric == INFINITY)
route_start_garbage(rn);
} else if (e->nexthop.s_addr != rn->nexthop.s_addr &&
metric == rn->metric) {
/* If the new metric is the same as the old one,
* examine the timeout for the existing route. If it
* is at least halfway to the expiration point, switch
* to the new route.
*/
timerclear(&tv);
gettimeofday(&now, NULL);
evtimer_pending(&rn->timeout_timer, &tv);
if (tv.tv_sec - now.tv_sec < ROUTE_TIMEOUT / 2) {
rn->nexthop.s_addr = e->nexthop.s_addr;
rn->ifindex = e->ifindex;
rde_send_change_kroute(rn);
}
}
if (e->nexthop.s_addr == rn->nexthop.s_addr &&
rn->metric < INFINITY)
route_reset_timers(rn);
}
return (0);
}
