nd6_dad_find
nd6_dad_find(ifa, nonce, &found_nonce);
if (nd6_dad_find(ifa, NULL, NULL) != NULL) {
dp = nd6_dad_find(ifa, NULL, NULL);
dp = nd6_dad_find(ifa, nonce, &found_nonce);
static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *, bool *);