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authorPhoebe Buckheister <phoebe.buckheister@itwm.fraunhofer.de>2014-03-15 00:24:00 +0400
committerDavid S. Miller <davem@davemloft.net>2014-03-15 06:15:26 +0400
commit94b4f6c21cf54029377a0645675a9d81b6cf890d (patch)
treeb52945b9b9d7377c2a6c585246533c96af13e895 /include
parentb70ab2e87f17176d18f67ef331064441a032b5f3 (diff)
downloadlinux-94b4f6c21cf54029377a0645675a9d81b6cf890d.tar.xz
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>
Diffstat (limited to 'include')
-rw-r--r--include/net/ieee802154.h28
-rw-r--r--include/net/ieee802154_netdev.h87
-rw-r--r--include/net/mac802154.h1
3 files changed, 112 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 */
diff --git a/include/net/ieee802154_netdev.h b/include/net/ieee802154_netdev.h
index e4810d566b1b..c3fc33a78920 100644
--- a/include/net/ieee802154_netdev.h
+++ b/include/net/ieee802154_netdev.h
@@ -28,6 +28,28 @@
#define IEEE802154_NETDEVICE_H
#include <net/af_ieee802154.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+
+struct ieee802154_sechdr {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u8 level:3,
+ key_id_mode:2,
+ reserved:3;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u8 reserved:3,
+ key_id_mode:2,
+ level:3;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+ u8 key_id;
+ __le32 frame_counter;
+ union {
+ __le32 short_src;
+ __le64 extended_src;
+ };
+};
struct ieee802154_addr {
u8 mode;
@@ -38,6 +60,71 @@ struct ieee802154_addr {
};
};
+struct ieee802154_hdr_fc {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u16 type:3,
+ security_enabled:1,
+ frame_pending:1,
+ ack_request:1,
+ intra_pan:1,
+ reserved:3,
+ dest_addr_mode:2,
+ version:2,
+ source_addr_mode:2;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u16 reserved:1,
+ intra_pan:1,
+ ack_request:1,
+ frame_pending:1,
+ security_enabled:1,
+ type:3,
+ source_addr_mode:2,
+ version:2,
+ dest_addr_mode:2,
+ reserved2:2;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+};
+
+struct ieee802154_hdr {
+ struct ieee802154_hdr_fc fc;
+ u8 seq;
+ struct ieee802154_addr source;
+ struct ieee802154_addr dest;
+ struct ieee802154_sechdr sec;
+};
+
+/* pushes hdr onto the skb. fields of hdr->fc that can be calculated from
+ * the contents of hdr will be, and the actual value of those bits in
+ * hdr->fc will be ignored. this includes the INTRA_PAN bit and the frame
+ * version, if SECEN is set.
+ */
+int ieee802154_hdr_push(struct sk_buff *skb, const struct ieee802154_hdr *hdr);
+
+/* pulls the entire 802.15.4 header off of the skb, including the security
+ * header, and performs pan id decompression
+ */
+int ieee802154_hdr_pull(struct sk_buff *skb, struct ieee802154_hdr *hdr);
+
+/* parses the frame control, sequence number of address fields in a given skb
+ * and stores them into hdr, performing pan id decompression and length checks
+ * to be suitable for use in header_ops.parse
+ */
+int ieee802154_hdr_peek_addrs(const struct sk_buff *skb,
+ struct ieee802154_hdr *hdr);
+
+static inline int ieee802154_hdr_length(struct sk_buff *skb)
+{
+ struct ieee802154_hdr hdr;
+ int len = ieee802154_hdr_pull(skb, &hdr);
+
+ if (len > 0)
+ skb_push(skb, len);
+
+ return len;
+}
+
static inline bool ieee802154_addr_equal(const struct ieee802154_addr *a1,
const struct ieee802154_addr *a2)
{
diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index f74b2a8bf2b6..a591053cae63 100644
--- a/include/net/mac802154.h
+++ b/include/net/mac802154.h
@@ -20,6 +20,7 @@
#define NET_MAC802154_H
#include <net/af_ieee802154.h>
+#include <linux/skbuff.h>
/* General MAC frame format:
* 2 bytes: Frame Control