ieee802154: add header structs with endiannes and operations

This patch provides a set of structures to represent 802.15.4 MAC
headers, and a set of operations to push/pull/peek these structs from
skbs. We cannot simply pointer-cast the skb MAC header pointer to these
structs, because 802.15.4 headers are wildly variable - depending on the
first three bytes, virtually all other fields of the header may be
present or not, and be present with different lengths.

The new header creation/parsing routines also support 802.15.4 security
headers, which are currently not supported by the mac802154
implementation of the protocol.

Signed-off-by: Phoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 4 deletions

diff --git a/include/net/ieee802154.h b/include/net/ieee802154.h
index ee59f8b188dd..c7ae0ac528dc 100644
--- a/include/net/ieee802154.h
+++ b/include/net/ieee802154.h
@@ -42,22 +42,42 @@
             (((x) << IEEE802154_FC_TYPE_SHIFT) & IEEE802154_FC_TYPE_MASK)); \
         } while (0)
 
-#define IEEE802154_FC_SECEN             (1 << 3)
-#define IEEE802154_FC_FRPEND            (1 << 4)
-#define IEEE802154_FC_ACK_REQ           (1 << 5)
-#define IEEE802154_FC_INTRA_PAN         (1 << 6)
+#define IEEE802154_FC_SECEN_SHIFT       3
+#define IEEE802154_FC_SECEN             (1 << IEEE802154_FC_SECEN_SHIFT)
+#define IEEE802154_FC_FRPEND_SHIFT      4
+#define IEEE802154_FC_FRPEND            (1 << IEEE802154_FC_FRPEND_SHIFT)
+#define IEEE802154_FC_ACK_REQ_SHIFT     5
+#define IEEE802154_FC_ACK_REQ           (1 << IEEE802154_FC_ACK_REQ_SHIFT)
+#define IEEE802154_FC_INTRA_PAN_SHIFT   6
+#define IEEE802154_FC_INTRA_PAN         (1 << IEEE802154_FC_INTRA_PAN_SHIFT)
 
 #define IEEE802154_FC_SAMODE_SHIFT      14
 #define IEEE802154_FC_SAMODE_MASK       (3 << IEEE802154_FC_SAMODE_SHIFT)
 #define IEEE802154_FC_DAMODE_SHIFT      10
 #define IEEE802154_FC_DAMODE_MASK       (3 << IEEE802154_FC_DAMODE_SHIFT)
 
+#define IEEE802154_FC_VERSION_SHIFT     12
+#define IEEE802154_FC_VERSION_MASK      (3 << IEEE802154_FC_VERSION_SHIFT)
+#define IEEE802154_FC_VERSION(x)        ((x & IEEE802154_FC_VERSION_MASK) >> IEEE802154_FC_VERSION_SHIFT)
+
 #define IEEE802154_FC_SAMODE(x)         \
         (((x) & IEEE802154_FC_SAMODE_MASK) >> IEEE802154_FC_SAMODE_SHIFT)
 
 #define IEEE802154_FC_DAMODE(x)         \
         (((x) & IEEE802154_FC_DAMODE_MASK) >> IEEE802154_FC_DAMODE_SHIFT)
 
+#define IEEE802154_SCF_SECLEVEL_MASK            7
+#define IEEE802154_SCF_SECLEVEL_SHIFT           0
+#define IEEE802154_SCF_SECLEVEL(x)              (x & IEEE802154_SCF_SECLEVEL_MASK)
+#define IEEE802154_SCF_KEY_ID_MODE_SHIFT        3
+#define IEEE802154_SCF_KEY_ID_MODE_MASK         (3 << IEEE802154_SCF_KEY_ID_MODE_SHIFT)
+#define IEEE802154_SCF_KEY_ID_MODE(x)           \
+        ((x & IEEE802154_SCF_KEY_ID_MODE_MASK) >> IEEE802154_SCF_KEY_ID_MODE_SHIFT)
+
+#define IEEE802154_SCF_KEY_IMPLICIT             0
+#define IEEE802154_SCF_KEY_INDEX                1
+#define IEEE802154_SCF_KEY_SHORT_INDEX          2
+#define IEEE802154_SCF_KEY_HW_INDEX             3
 
 /* MAC footer size */
 #define IEEE802154_MFR_SIZE     2 /* 2 octets */