ieee802154: add ieee802154_skb_dst_pan helper
This patch adds ieee802154_skb_dst_pan function to get the pointer
address of the destination pan id at skb mac pointer.
Signed-off-by: Alexander Aring <aar@pengutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index e465c855..b3f7cd8 100644
--- a/include/net/mac802154.h
+++ b/include/net/mac802154.h
@@ -258,6 +258,35 @@
}
/**
+ * ieee802154_skb_dst_pan - get the pointer to destination pan field
+ * @fc: mac header frame control field
+ * @skb: skb where the destination pan pointer will be get from
+ */
+static inline unsigned char *ieee802154_skb_dst_pan(__le16 fc,
+ const struct sk_buff *skb)
+{
+ unsigned char *dst_pan;
+
+ switch (ieee802154_daddr_mode(fc)) {
+ case cpu_to_le16(IEEE802154_FCTL_ADDR_NONE):
+ dst_pan = NULL;
+ break;
+ case cpu_to_le16(IEEE802154_FCTL_DADDR_SHORT):
+ case cpu_to_le16(IEEE802154_FCTL_DADDR_EXTENDED):
+ dst_pan = skb_mac_header(skb) +
+ IEEE802154_FC_LEN +
+ IEEE802154_SEQ_LEN;
+ break;
+ default:
+ WARN_ONCE(1, "invalid addr mode detected");
+ dst_pan = NULL;
+ break;
+ }
+
+ return dst_pan;
+}
+
+/**
* ieee802154_be64_to_le64 - copies and convert be64 to le64
* @le64_dst: le64 destination pointer
* @be64_src: be64 source pointer