P2P: Do not allow scan or normal association on cfg80211 P2P Device

The dedicated P2P management instance (wpas->p2p_mgmt == 1) using
cfg80211 P2P Device cannot be used for non-P2P uses or connection (there
is no netdev). Reject or ignore such operations to avoid unexpected
operations if enabled network blocks are configured in the
wpa_supplicant instance used to control this interface.

Signed-off-by: Jouni Malinen <j@w1.fi>

wpa_supplicant/events.c

@@ -1421,6 +1421,9 @@ static int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s,
 	struct wpa_bss *selected;
 	struct wpa_ssid *ssid = NULL;
 
+	if (wpa_s->p2p_mgmt)
+		return 0; /* no normal connection on p2p_mgmt interface */
+
 	selected = wpa_supplicant_pick_network(wpa_s, &ssid);
 
 	if (selected) {

wpa_supplicant/scan.c

@@ -96,6 +96,10 @@ int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
 {
 	struct wpa_ssid *ssid = wpa_s->conf->ssid;
 	int count = 0, disabled = 0;
+
+	if (wpa_s->p2p_mgmt)
+		return 0; /* no normal network profiles on p2p_mgmt interface */
+
 	while (ssid) {
 		if (!wpas_network_disabled(wpa_s, ssid))
 			count++;
@@ -1066,8 +1070,17 @@ void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
  */
 void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
 {
-	int res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
+	int res;
-					NULL);
+
+	if (wpa_s->p2p_mgmt) {
+		wpa_dbg(wpa_s, MSG_DEBUG,
+			"Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
+			sec, usec);
+		return;
+	}
+
+	res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
+				    NULL);
 	if (res == 1) {
 		wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
 			sec, usec);

wpa_supplicant/wpa_supplicant.c

@@ -4966,6 +4966,9 @@ int wpas_network_disabled(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
 	int i;
 	unsigned int drv_enc;
 
+	if (wpa_s->p2p_mgmt)
+		return 1; /* no normal network profiles on p2p_mgmt interface */
+
 	if (ssid == NULL)
 		return 1;