/*
* Probe if each router in the default router list is still alive.
*/
void
defrouter_probe(struct ifinfo *ifinfo)
{
struct in6_defrouter *p, *ep;
int ifindex, mib[4];
char *buf, ntopbuf[INET6_ADDRSTRLEN];
size_t l;
ifindex = ifinfo->sdl->sdl_index;
if (ifindex == 0)
return;
mib[0] = CTL_NET;
mib[1] = PF_INET6;
mib[2] = IPPROTO_ICMPV6;
mib[3] = ICMPV6CTL_ND6_DRLIST;
if (sysctl(mib, nitems(mib), NULL, &l, NULL, 0) < 0) {
warnmsg(LOG_ERR, __func__, "sysctl(ICMPV6CTL_ND6_DRLIST): %s",
strerror(errno));
return;
}
if (l == 0)
return;
buf = malloc(l);
if (buf == NULL) {
warnmsg(LOG_ERR, __func__, "malloc(): %s", strerror(errno));
return;
}
if (sysctl(mib, nitems(mib), buf, &l, NULL, 0) < 0) {
warnmsg(LOG_ERR, __func__, "sysctl(ICMPV6CTL_ND6_DRLIST): %s",
strerror(errno));
free(buf);
return;
}
ep = (struct in6_defrouter *)(void *)(buf + l);
for (p = (struct in6_defrouter *)(void *)buf; p < ep; p++) {
if (ifindex != p->if_index)
continue;
if (!IN6_IS_ADDR_LINKLOCAL(&p->rtaddr.sin6_addr)) {
warnmsg(LOG_ERR, __func__,
"default router list contains a "
"non-link-local address(%s)",
inet_ntop(AF_INET6, &p->rtaddr.sin6_addr, ntopbuf,
INET6_ADDRSTRLEN));
continue; /* ignore the address */
}
sendprobe(&p->rtaddr.sin6_addr, ifinfo);
}
free(buf);
}
/*
* Probe if each router in the default router list is still alive.
*/
void
defrouter_probe(int ifindex)
{
struct in6_drlist dr;
int s, i;
u_char ntopbuf[INET6_ADDRSTRLEN];
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
warnmsg(LOG_ERR, __FUNCTION__, "socket: %s", strerror(errno));
return;
}
bzero(&dr, sizeof(dr));
strlcpy(dr.ifname, "lo0", sizeof(dr.ifname)); /* dummy interface */
if (ioctl(s, SIOCGDRLST_IN6, (caddr_t)&dr) < 0) {
warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGDRLST_IN6): %s",
strerror(errno));
goto closeandend;
}
for(i = 0; dr.defrouter[i].if_index && i < PRLSTSIZ; i++) {
if (ifindex && dr.defrouter[i].if_index == ifindex) {
/* sanity check */
if (!IN6_IS_ADDR_LINKLOCAL(&dr.defrouter[i].rtaddr)) {
warnmsg(LOG_ERR, __FUNCTION__,
"default router list contains a "
"non-linklocal address(%s)",
inet_ntop(AF_INET6,
&dr.defrouter[i].rtaddr,
(char *)ntopbuf, INET6_ADDRSTRLEN));
continue; /* ignore the address */
}
sendprobe(&dr.defrouter[i].rtaddr,
dr.defrouter[i].if_index);
}
}
closeandend:
close(s);
return;
}