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-rw-r--r--include/linux/ieee80211.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 272f8c8c90d..30621c27159 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -16,6 +16,7 @@
#define IEEE80211_H
#include <linux/types.h>
+#include <asm/byteorder.h>
#define FCS_LEN 4
@@ -350,4 +351,64 @@ enum ieee80211_eid {
#define WLAN_MAX_KEY_LEN 32
+/**
+ * ieee80211_get_SA - get pointer to SA
+ *
+ * Given an 802.11 frame, this function returns the offset
+ * to the source address (SA). It does not verify that the
+ * header is long enough to contain the address, and the
+ * header must be long enough to contain the frame control
+ * field.
+ *
+ * @hdr: the frame
+ */
+static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr)
+{
+ u8 *raw = (u8 *) hdr;
+ u8 tofrom = (*(raw+1)) & 3; /* get the TODS and FROMDS bits */
+
+ switch (tofrom) {
+ case 2:
+ return hdr->addr3;
+ case 3:
+ return hdr->addr4;
+ }
+ return hdr->addr2;
+}
+
+/**
+ * ieee80211_get_DA - get pointer to DA
+ *
+ * Given an 802.11 frame, this function returns the offset
+ * to the destination address (DA). It does not verify that
+ * the header is long enough to contain the address, and the
+ * header must be long enough to contain the frame control
+ * field.
+ *
+ * @hdr: the frame
+ */
+static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr)
+{
+ u8 *raw = (u8 *) hdr;
+ u8 to_ds = (*(raw+1)) & 1; /* get the TODS bit */
+
+ if (to_ds)
+ return hdr->addr3;
+ return hdr->addr1;
+}
+
+/**
+ * ieee80211_get_morefrag - determine whether the MOREFRAGS bit is set
+ *
+ * This function determines whether the "more fragments" bit is set
+ * in the frame.
+ *
+ * @hdr: the frame
+ */
+static inline int ieee80211_get_morefrag(struct ieee80211_hdr *hdr)
+{
+ return (le16_to_cpu(hdr->frame_control) &
+ IEEE80211_FCTL_MOREFRAGS) != 0;
+}
+
#endif /* IEEE80211_H */