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>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/linux/ieee802154.h b/include/linux/ieee802154.h
index 205ce4e1ac32..aca228b81464 100644
--- 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
@@ -233,6 +236,15 @@ static inline int ieee802154_is_data(__le16 fc)
 }
 
 /**
+ * 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
  */