P2P: Show P2P flag in BSS entries also based on Beacon frames

It is possible that a P2P GO has been discovered through a non-P2P scan
that did not return P2P IE in Probe Response frames. To cover those
cases, check also Beacon frame (if received) for P2P IE.

Change-Id: If1d855022785f5d801e2d91c1d2fcac35760f717
CRs-Fixed: 535523
Git-commit: bb50ae439686fb69f52288a618e6d176462ab726
Git-repo: git://w1.fi/srv/git/hostap.git
Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

3 files changed, 43 insertions, 1 deletions

diff --git a/wpa_supplicant/bss.c b/wpa_supplicant/bss.c
index 0e1576b0..ec640b5f 100644
--- a/wpa_supplicant/bss.c
+++ b/wpa_supplicant/bss.c
@@ -1001,6 +1001,43 @@ const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
 
 
 /**
+ * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry
+ * @bss: BSS table entry
+ * @vendor_type: Vendor type (four octets starting the IE payload)
+ * Returns: Pointer to the information element (id field) or %NULL if not found
+ *
+ * This function returns the first matching information element in the BSS
+ * entry.
+ *
+ * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only
+ * from Beacon frames instead of either Beacon or Probe Response frames.
+ */
+const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
+					u32 vendor_type)
+{
+	const u8 *end, *pos;
+
+	if (bss->beacon_ie_len == 0)
+		return NULL;
+
+	pos = (const u8 *) (bss + 1);
+	pos += bss->ie_len;
+	end = pos + bss->beacon_ie_len;
+
+	while (pos + 1 < end) {
+		if (pos + 2 + pos[1] > end)
+			break;
+		if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
+		    vendor_type == WPA_GET_BE32(&pos[2]))
+			return pos;
+		pos += 2 + pos[1];
+	}
+
+	return NULL;
+}
+
+
+/**
  * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
  * @bss: BSS table entry
  * @vendor_type: Vendor type (four octets starting the IE payload)
diff --git a/wpa_supplicant/bss.h b/wpa_supplicant/bss.h
index 2b419488..0d2693fd 100644
--- a/wpa_supplicant/bss.h
+++ b/wpa_supplicant/bss.h
@@ -118,6 +118,8 @@ struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
 				      unsigned int idf, unsigned int idl);
 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie);
 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type);
+const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
+					u32 vendor_type);
 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
 					    u32 vendor_type);
 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
diff --git a/wpa_supplicant/ctrl_iface.c b/wpa_supplicant/ctrl_iface.c
index 369a39ed..449ad74a 100644
--- a/wpa_supplicant/ctrl_iface.c
+++ b/wpa_supplicant/ctrl_iface.c
@@ -2022,6 +2022,8 @@ static int wpa_supplicant_ctrl_iface_scan_result(
 	const u8 *ie, *ie2, *p2p;
 
 	p2p = wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE);
+	if (!p2p)
+		p2p = wpa_bss_get_vendor_ie_beacon(bss, P2P_IE_VENDOR_TYPE);
 	if (p2p && bss->ssid_len == P2P_WILDCARD_SSID_LEN &&
 	    os_memcmp(bss->ssid, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) ==
 	    0)
@@ -3214,7 +3216,8 @@ static int print_bss_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
 				return 0;
 			pos += ret;
 		}
-		if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE)) {
+		if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) ||
+		    wpa_bss_get_vendor_ie_beacon(bss, P2P_IE_VENDOR_TYPE)) {
 			ret = os_snprintf(pos, end - pos, "[P2P]");
 			if (ret < 0 || ret >= end - pos)
 				return 0;