udp_cache
(xid % (SPARSENESS*((struct udp_cache *) su_data(transp)->su_cache)->uc_size))
struct udp_cache *uc;
uc = ALLOC(struct udp_cache, 1);
struct udp_cache *uc = (struct udp_cache *) su->su_cache;
struct udp_cache *uc = su->su_cache;