nd6_lookup
nrt = nd6_lookup(nexthop, 0, ifp, ifp->if_rdomain);
rt = nd6_lookup(from, 0, ifp, ifp->if_rdomain);
rt = nd6_lookup(from, 1, ifp, ifp->if_rdomain);
rt = nd6_lookup(&addr->sin6_addr, 0, ifp, ifp->if_rdomain);
rt = nd6_lookup(&nb_addr, 0, ifp, ifp->if_rdomain);
struct rtentry *nd6_lookup(const struct in6_addr *, int, struct ifnet *,
rt = nd6_lookup(&taddr6, 0, ifp, ifp->if_rdomain);
rt = nd6_lookup(&taddr6, 1, ifp, ifp->if_rdomain);