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>
diff --git a/net/ieee802154/Makefile b/net/ieee802154/Makefile
index 78b1fa2..bf1b514 100644
--- a/net/ieee802154/Makefile
+++ b/net/ieee802154/Makefile
@@ -3,7 +3,8 @@
 obj-$(CONFIG_6LOWPAN_IPHC) += 6lowpan_iphc.o
 
 6lowpan-y := 6lowpan_rtnl.o reassembly.o
-ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o wpan-class.o
+ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o wpan-class.o \
+                header_ops.o
 af_802154-y := af_ieee802154.o raw.o dgram.o
 
 ccflags-y += -D__CHECK_ENDIAN__