cfg80211: add cfg80211_find_vendor_ie() function
Add function to find vendor-specific ie (along with
vendor-specific ie struct definition and P2P OUI values)
Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 72f3933..b5e0a5c 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -777,6 +777,13 @@
u8 mic[8];
} __attribute__ ((packed));
+struct ieee80211_vendor_ie {
+ u8 element_id;
+ u8 len;
+ u8 oui[3];
+ u8 oui_type;
+} __packed;
+
/* Control frames */
struct ieee80211_rts {
__le16 frame_control;
@@ -1470,6 +1477,9 @@
#define WLAN_PMKID_LEN 16
+#define WLAN_OUI_WFA 0x506f9a
+#define WLAN_OUI_TYPE_WFA_P2P 9
+
/*
* WMM/802.11e Tspec Element
*/
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index b42136a..9518b5c 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2459,6 +2459,24 @@
const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len);
/**
+ * cfg80211_find_vendor_ie - find vendor specific information element in data
+ *
+ * @oui: vendor OUI
+ * @oui_type: vendor-specific OUI type
+ * @ies: data consisting of IEs
+ * @len: length of data
+ *
+ * This function will return %NULL if the vendor specific element ID
+ * could not be found or if the element is invalid (claims to be
+ * longer than the given data), or a pointer to the first byte
+ * of the requested element, that is the byte containing the
+ * element ID. There are no checks on the element length
+ * other than having to fit into the given data.
+ */
+const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
+ const u8 *ies, int len);
+
+/**
* DOC: Regulatory enforcement infrastructure
*
* TODO
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index b0f0039..0fb1424 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -228,6 +228,33 @@
}
EXPORT_SYMBOL(cfg80211_find_ie);
+const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
+ const u8 *ies, int len)
+{
+ struct ieee80211_vendor_ie *ie;
+ const u8 *pos = ies, *end = ies + len;
+ int ie_oui;
+
+ while (pos < end) {
+ pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
+ end - pos);
+ if (!pos)
+ return NULL;
+
+ if (end - pos < sizeof(*ie))
+ return NULL;
+
+ ie = (struct ieee80211_vendor_ie *)pos;
+ ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
+ if (ie_oui == oui && ie->oui_type == oui_type)
+ return pos;
+
+ pos += 2 + ie->len;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(cfg80211_find_vendor_ie);
+
static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
{
const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);