LLC_PDU_TYPE_MASK 80 net/llc/llc_input.c if ((pdu->ctrl_1 & LLC_PDU_TYPE_MASK) != LLC_PDU_TYPE_U) LLC_PDU_TYPE_MASK 120 net/llc/llc_input.c if ((pdu->ctrl_1 & LLC_PDU_TYPE_MASK) == LLC_PDU_TYPE_U)