ip6_neigh_lookup
struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6,
neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6,
return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any),