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ieee802154: add header structs with endiannes and operations

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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>
This commit is contained in:
Phoebe Buckheister
2014-03-14 21:24:00 +01:00
committed by David S. Miller
parent b70ab2e87f
commit 94b4f6c21c
5 changed files with 401 additions and 5 deletions
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87
include/net/ieee802154_netdev.h
View File

@@ -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)
{