inet6_rth_add
extern int inet6_rth_add(void *, const struct in6_addr *);
if (inet6_rth_add(opt_bufp, &gw_addrs[i].gw_addr6) == -1) {
if (inet6_rth_add(rthdr0p, &gwIPlist[i].addr6) == -1) {
if (inet6_rth_add(rthdr0p,
extern int inet6_rth_add(void *bp, const struct in6_addr *addr);