@@ -276,6 +276,30 @@ enum {
IEEE802154_SYSTEM_ERROR = 0xff,
};
+/**
+ * enum ieee802154_filtering_level - Filtering levels applicable to a PHY
+ *
+ * @IEEE802154_FILTERING_NONE: No filtering at all, what is received is
+ * forwarded to the softMAC
+ * @IEEE802154_FILTERING_1_FCS: First filtering level, frames with an invalid
+ * FCS should be dropped
+ * @IEEE802154_FILTERING_2_PROMISCUOUS: Second filtering level, promiscuous
+ * mode as described in the spec, identical in terms of filtering to the
+ * level one on PHY side, but at the MAC level the frame should be
+ * forwarded to the upper layer directly
+ * @IEEE802154_FILTERING_3_SCAN: Third filtering level, scan related, where
+ * only beacons must be processed, all remaining traffic gets dropped
+ * @IEEE802154_FILTERING_4_FRAME_FIELDS: Fourth filtering level actually
+ * enforcing the validity of the content of the frame with various checks
+ */
+enum ieee802154_filtering_level {
+ IEEE802154_FILTERING_NONE,
+ IEEE802154_FILTERING_1_FCS,
+ IEEE802154_FILTERING_2_PROMISCUOUS,
+ IEEE802154_FILTERING_3_SCAN,
+ IEEE802154_FILTERING_4_FRAME_FIELDS,
+};
+
/* frame control handling */
#define IEEE802154_FCTL_FTYPE 0x0003
#define IEEE802154_FCTL_ACKREQ 0x0020
The 802154 specification details several filtering levels in which the PHY and the MAC could be. The amount of filtering will vary if they are in promiscuous mode or in scanning mode. Otherwise they are expected to do some very basic checks, such as enforcing the frame validity. Either the PHY is able to do so, and the MAC has nothing to do, or the PHY has a lower filtering level than expected and the MAC should take over. For now we just define these levels in an enumeration. In a second time, we will add a per-PHY parameter showing the expected filtering level as well as a per device current filtering level, and will initialize all these fields. In a third time, we will use them to apply more filtering by software when the PHY is limited. Indeed, if the drivers know they cannot reach the requested level of filtering, they will overwrite the "current filtering" parameter so that it reflects what they do. Then, in the core, the expected filtering level will be used to decide whether some additional software processing is needed or not. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> --- include/linux/ieee802154.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)