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https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
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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 <[email protected]> Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Phoebe Buckheister
David S. Miller
parent
b70ab2e87f
commit
94b4f6c21c
5 changed files with 401 additions and 5 deletions
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@ -42,22 +42,42 @@
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(((x) << IEEE802154_FC_TYPE_SHIFT) & IEEE802154_FC_TYPE_MASK)); \
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} while (0)
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#define IEEE802154_FC_SECEN (1 << 3)
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#define IEEE802154_FC_FRPEND (1 << 4)
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#define IEEE802154_FC_ACK_REQ (1 << 5)
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#define IEEE802154_FC_INTRA_PAN (1 << 6)
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#define IEEE802154_FC_SECEN_SHIFT 3
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#define IEEE802154_FC_SECEN (1 << IEEE802154_FC_SECEN_SHIFT)
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#define IEEE802154_FC_FRPEND_SHIFT 4
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#define IEEE802154_FC_FRPEND (1 << IEEE802154_FC_FRPEND_SHIFT)
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#define IEEE802154_FC_ACK_REQ_SHIFT 5
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#define IEEE802154_FC_ACK_REQ (1 << IEEE802154_FC_ACK_REQ_SHIFT)
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#define IEEE802154_FC_INTRA_PAN_SHIFT 6
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#define IEEE802154_FC_INTRA_PAN (1 << IEEE802154_FC_INTRA_PAN_SHIFT)
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#define IEEE802154_FC_SAMODE_SHIFT 14
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#define IEEE802154_FC_SAMODE_MASK (3 << IEEE802154_FC_SAMODE_SHIFT)
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#define IEEE802154_FC_DAMODE_SHIFT 10
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#define IEEE802154_FC_DAMODE_MASK (3 << IEEE802154_FC_DAMODE_SHIFT)
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#define IEEE802154_FC_VERSION_SHIFT 12
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#define IEEE802154_FC_VERSION_MASK (3 << IEEE802154_FC_VERSION_SHIFT)
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#define IEEE802154_FC_VERSION(x) ((x & IEEE802154_FC_VERSION_MASK) >> IEEE802154_FC_VERSION_SHIFT)
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#define IEEE802154_FC_SAMODE(x) \
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(((x) & IEEE802154_FC_SAMODE_MASK) >> IEEE802154_FC_SAMODE_SHIFT)
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#define IEEE802154_FC_DAMODE(x) \
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(((x) & IEEE802154_FC_DAMODE_MASK) >> IEEE802154_FC_DAMODE_SHIFT)
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#define IEEE802154_SCF_SECLEVEL_MASK 7
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#define IEEE802154_SCF_SECLEVEL_SHIFT 0
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#define IEEE802154_SCF_SECLEVEL(x) (x & IEEE802154_SCF_SECLEVEL_MASK)
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#define IEEE802154_SCF_KEY_ID_MODE_SHIFT 3
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#define IEEE802154_SCF_KEY_ID_MODE_MASK (3 << IEEE802154_SCF_KEY_ID_MODE_SHIFT)
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#define IEEE802154_SCF_KEY_ID_MODE(x) \
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((x & IEEE802154_SCF_KEY_ID_MODE_MASK) >> IEEE802154_SCF_KEY_ID_MODE_SHIFT)
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#define IEEE802154_SCF_KEY_IMPLICIT 0
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#define IEEE802154_SCF_KEY_INDEX 1
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#define IEEE802154_SCF_KEY_SHORT_INDEX 2
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#define IEEE802154_SCF_KEY_HW_INDEX 3
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/* MAC footer size */
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#define IEEE802154_MFR_SIZE 2 /* 2 octets */
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@ -28,6 +28,28 @@
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#define IEEE802154_NETDEVICE_H
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#include <net/af_ieee802154.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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struct ieee802154_sechdr {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u8 level:3,
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key_id_mode:2,
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reserved:3;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u8 reserved:3,
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key_id_mode:2,
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level:3;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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u8 key_id;
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__le32 frame_counter;
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union {
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__le32 short_src;
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__le64 extended_src;
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};
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};
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struct ieee802154_addr {
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u8 mode;
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@ -38,6 +60,71 @@ struct ieee802154_addr {
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};
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};
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struct ieee802154_hdr_fc {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u16 type:3,
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security_enabled:1,
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frame_pending:1,
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ack_request:1,
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intra_pan:1,
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reserved:3,
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dest_addr_mode:2,
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version:2,
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source_addr_mode:2;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u16 reserved:1,
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intra_pan:1,
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ack_request:1,
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frame_pending:1,
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security_enabled:1,
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type:3,
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source_addr_mode:2,
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version:2,
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dest_addr_mode:2,
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reserved2:2;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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};
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struct ieee802154_hdr {
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struct ieee802154_hdr_fc fc;
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u8 seq;
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struct ieee802154_addr source;
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struct ieee802154_addr dest;
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struct ieee802154_sechdr sec;
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};
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/* pushes hdr onto the skb. fields of hdr->fc that can be calculated from
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* the contents of hdr will be, and the actual value of those bits in
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* hdr->fc will be ignored. this includes the INTRA_PAN bit and the frame
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* version, if SECEN is set.
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*/
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int ieee802154_hdr_push(struct sk_buff *skb, const struct ieee802154_hdr *hdr);
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/* pulls the entire 802.15.4 header off of the skb, including the security
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* header, and performs pan id decompression
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*/
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int ieee802154_hdr_pull(struct sk_buff *skb, struct ieee802154_hdr *hdr);
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/* parses the frame control, sequence number of address fields in a given skb
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* and stores them into hdr, performing pan id decompression and length checks
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* to be suitable for use in header_ops.parse
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*/
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int ieee802154_hdr_peek_addrs(const struct sk_buff *skb,
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struct ieee802154_hdr *hdr);
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static inline int ieee802154_hdr_length(struct sk_buff *skb)
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{
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struct ieee802154_hdr hdr;
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int len = ieee802154_hdr_pull(skb, &hdr);
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if (len > 0)
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skb_push(skb, len);
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return len;
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}
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static inline bool ieee802154_addr_equal(const struct ieee802154_addr *a1,
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const struct ieee802154_addr *a2)
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{
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@ -20,6 +20,7 @@
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#define NET_MAC802154_H
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#include <net/af_ieee802154.h>
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#include <linux/skbuff.h>
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/* General MAC frame format:
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* 2 bytes: Frame Control
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