Interworking: Fix already-connected check to verify network priority

Commit d28f4e44f10a8549d969e5434f7d4d16f462dfcc optimized Interworking
network selection in a case where the operation is run while already
connected to the selected network by skipping the reconnection. However,
this did not take into account that a higher priority network may have
shown up in the new scan results.

Fix this by checking whether network selection based on the latest scan
results (the ones from the interworking_select operation) would result
in a network with higher priority being selected. If so, skip the
optimization and force normal network connection (which will select this
newly found higher priority network). This fixes cases where a
non-Hotspot 2.0 network with higher priority (e.g., home network) shows
up while connected to a Hotspot 2.0 network with lower priority.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

wpa_supplicant/interworking.c

@@ -814,7 +814,8 @@ static int set_root_nai(struct wpa_ssid *ssid, const char *imsi, char prefix)
 static int already_connected(struct wpa_supplicant *wpa_s,
 			     struct wpa_cred *cred, struct wpa_bss *bss)
 {
-	struct wpa_ssid *ssid;
+	struct wpa_ssid *ssid, *sel_ssid;
+	struct wpa_bss *selected;
 
 	if (wpa_s->wpa_state < WPA_ASSOCIATED || wpa_s->current_ssid == NULL)
 		return 0;
@@ -827,6 +828,11 @@ static int already_connected(struct wpa_supplicant *wpa_s,
 	    os_memcmp(ssid->ssid, bss->ssid, bss->ssid_len) != 0)
 		return 0;
 
+	sel_ssid = NULL;
+	selected = wpa_supplicant_pick_network(wpa_s, &sel_ssid);
+	if (selected && sel_ssid && sel_ssid->priority > ssid->priority)
+		return 0; /* higher priority network in scan results */
+
 	return 1;
 }