__neigh_lookup
struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev,
n = __neigh_lookup(&arp_tbl, &sip, dev, 0);
n = __neigh_lookup(&arp_tbl, &sip, dev, 1);
neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
neigh = __neigh_lookup(&nd_tbl, saddr, dev,
neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);