ICE_BT_VLD_KEY
key = on ? ICE_BT_VLD_KEY : ICE_BT_INV_KEY;
ICE_BT_VLD_KEY - buf[ICE_UDP_PORT_OFF_L];
ICE_BT_VLD_KEY - buf[ICE_UDP_PORT_OFF_H];
item->key_inv[ICE_BT_TUN_PORT_OFF_L] = ICE_BT_VLD_KEY;
item->key[ICE_BT_TUN_PORT_OFF_L] = ICE_BT_VLD_KEY;