@@ -50,6 +50,7 @@
#define IEEE802154_EXTENDED_ADDR_LEN 8
#define IEEE802154_SHORT_ADDR_LEN 2
+#define IEEE802154_PAN_ID_LEN 2
#define IEEE802154_LIFS_PERIOD 40
#define IEEE802154_SIFS_PERIOD 12
@@ -224,12 +225,15 @@ enum {
#define IEEE802154_FCTL_SECEN 0x0004
#define IEEE802154_FCTL_INTRA_PAN 0x0040
#define IEEE802154_FCTL_DADDR 0x0c00
+#define IEEE802154_FCTL_SADDR 0xc000
#define IEEE802154_FTYPE_DATA 0x0001
#define IEEE802154_FCTL_ADDR_NONE 0x0000
#define IEEE802154_FCTL_DADDR_SHORT 0x0800
#define IEEE802154_FCTL_DADDR_EXTENDED 0x0c00
+#define IEEE802154_FCTL_SADDR_SHORT 0x8000
+#define IEEE802154_FCTL_SADDR_EXTENDED 0xc000
/*
* ieee802154_is_data - check if type is IEEE802154_FTYPE_DATA
@@ -277,6 +281,15 @@ static inline __le16 ieee802154_daddr_mode(__le16 fc)
return fc & cpu_to_le16(IEEE802154_FCTL_DADDR);
}
+/*
+ * ieee802154_saddr_mode - get saddr mode from fc
+ * @fc: frame control bytes in little-endian byteorder
+ */
+static inline __le16 ieee802154_saddr_mode(__le16 fc)
+{
+ return fc & cpu_to_le16(IEEE802154_FCTL_SADDR);
+}
+
/**
* ieee802154_is_valid_psdu_len - check if psdu len is valid
* available lengths:
@@ -287,6 +287,65 @@ static inline unsigned char *ieee802154_skb_dst_pan(__le16 fc,
}
/**
+ * ieee802154_skb_src_pan - get the pointer to source pan field
+ * @fc: mac header frame control field
+ * @skb: skb where the source pan pointer will be get from
+ */
+static inline unsigned char *ieee802154_skb_src_pan(__le16 fc,
+ const struct sk_buff *skb)
+{
+ unsigned char *src_pan;
+
+ switch (ieee802154_saddr_mode(fc)) {
+ case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
+ src_pan = NULL;
+ break;
+ case cpu_to_le16(IEEE802154_FCTL_SADDR_SHORT):
+ case cpu_to_le16(IEEE802154_FCTL_SADDR_EXTENDED):
+ /* if intra-pan and source addr mode is non none,
+ * then source pan id is equal destination pan id.
+ */
+ if (ieee802154_is_intra_pan(fc)) {
+ src_pan = ieee802154_skb_dst_pan(fc, skb);
+ break;
+ }
+
+ switch (ieee802154_daddr_mode(fc)) {
+ case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
+ src_pan = skb_mac_header(skb) +
+ IEEE802154_FC_LEN +
+ IEEE802154_SEQ_LEN;
+ break;
+ case cpu_to_le16(IEEE802154_FCTL_DADDR_SHORT):
+ src_pan = skb_mac_header(skb) +
+ IEEE802154_FC_LEN +
+ IEEE802154_SEQ_LEN +
+ IEEE802154_PAN_ID_LEN +
+ IEEE802154_SHORT_ADDR_LEN;
+ break;
+ case cpu_to_le16(IEEE802154_FCTL_DADDR_EXTENDED):
+ src_pan = skb_mac_header(skb) +
+ IEEE802154_FC_LEN +
+ IEEE802154_SEQ_LEN +
+ IEEE802154_PAN_ID_LEN +
+ IEEE802154_EXTENDED_ADDR_LEN;
+ break;
+ default:
+ WARN_ONCE(1, "invalid addr mode detected");
+ src_pan = NULL;
+ break;
+ }
+ break;
+ default:
+ WARN_ONCE(1, "invalid addr mode detected");
+ src_pan = NULL;
+ break;
+ }
+
+ return src_pan;
+}
+
+/**
* ieee802154_be64_to_le64 - copies and convert be64 to le64
* @le64_dst: le64 destination pointer
* @be64_src: be64 source pointer
This patch adds ieee802154_skb_src_pan function to get the pointer address of the source pan id at skb mac pointer. Signed-off-by: Alexander Aring <aar@pengutronix.de> --- include/linux/ieee802154.h | 13 ++++++++++ include/net/mac802154.h | 59 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 72 insertions(+)