ipfw_objhash_create
ii = ipfw_objhash_create(DEFAULT_IFACES, DEFAULT_OBJHASH_SIZE);
struct namedobj_instance *ipfw_objhash_create(uint32_t items, size_t hash_size);
ch->srvmap = ipfw_objhash_create(IPFW_OBJECTS_DEFAULT,
tcfg->namehash = ipfw_objhash_create(V_fw_tables_max,
icfg->ii = ipfw_objhash_create(DEFAULT_IFIDX_SIZE, DEFAULT_OBJHASH_SIZE);
tcfg->valhash = ipfw_objhash_create(tcfg->val_size, VALDATA_HASH_SIZE);