ieee802154: add helpers for frame control checks

This patch introduce two static inline functions. The first to get the
frame control field from an sk_buff. The second is for checking on the
acknowledgment request bit on the frame control field. Later we can
introduce more functions to check on the frame control fields.

These will deprecate the current behaviour which requires a
host-byteorder conversion and manually bit handling.

Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/include/linux/ieee802154.h b/include/linux/ieee802154.h
index 205ce4e1ac320eea4ffb224a3cee6284dab6850d..aca228b81464ca2d68b302617e07af5ccb9ded79 100644 (file)
--- a/include/linux/ieee802154.h
+++ b/include/linux/ieee802154.h
@@ -25,6 +25,8 @@
 
 #include <linux/types.h>
 #include <linux/random.h>
+#include <linux/skbuff.h>
+#include <linux/unaligned/memmove.h>
 #include <asm/byteorder.h>
 
 #define IEEE802154_MTU                 127
@@ -218,6 +220,7 @@ enum {
 
 /* frame control handling */
 #define IEEE802154_FCTL_FTYPE          0x0003
+#define IEEE802154_FCTL_ACKREQ         0x0020
 #define IEEE802154_FCTL_INTRA_PAN      0x0040
 
 #define IEEE802154_FTYPE_DATA          0x0001
@@ -232,6 +235,15 @@ static inline int ieee802154_is_data(__le16 fc)
                cpu_to_le16(IEEE802154_FTYPE_DATA);
 }
 
+/**
+ * ieee802154_is_ackreq - check if acknowledgment request bit is set
+ * @fc: frame control bytes in little-endian byteorder
+ */
+static inline bool ieee802154_is_ackreq(__le16 fc)
+{
+       return fc & cpu_to_le16(IEEE802154_FCTL_ACKREQ);
+}
+
 /**
  * ieee802154_is_intra_pan - check if intra pan id communication
  * @fc: frame control bytes in little-endian byteorder