Support Passpoint frame filters in Android

The conf->hs20 flag is not used in Android, but HS 2.0
configuration is still required when setting up the frame filters
in the WPA driver. Split the is_hs20_network() to two functions,
and moved the conf->hs20() check to a new is_hs20_config function.
Added ANDROID compilation flag in hs20_configure_frame_filters()
to skip the configuration check.
Additionally, trigger a call to hs20_configure_frame_filters()
upon succesful connection when state equals to WPA_COMPLETED.

Bug: 168681498
Test: Verify wpa driver is called with the appropriate frame filter
flags when connecting to Passpoint networks.
Test: Verify wpa driver is not called to filter frames for other
Enterprise networks.

Change-Id: I3afea6018d5ddd2211974ca10a30180c6cc204e7

wpa_supplicant/hs20_supplicant.c

@@ -73,7 +73,12 @@ void hs20_configure_frame_filters(struct wpa_supplicant *wpa_s)
 	const u8 *ext_capa;
 	u32 filter = 0;
 
-	if (!bss || !is_hs20_network(wpa_s, wpa_s->current_ssid, bss)) {
+	if (!bss || !is_hs20_network(wpa_s, wpa_s->current_ssid, bss)
+#ifndef ANDROID
+			// HS 2.0 Configuration is not used in AOSP
+			|| !is_hs20_config(wpa_s)
+#endif
+			) {
 		wpa_printf(MSG_DEBUG,
 			   "Not configuring frame filtering - BSS " MACSTR
 			   " is not a Hotspot 2.0 network", MAC2STR(bssid));
@@ -158,11 +163,15 @@ int get_hs20_version(struct wpa_bss *bss)
 	return ((ie[6] >> 4) & 0x0f) + 1;
 }
 
+int is_hs20_config(struct wpa_supplicant *wpa_s)
+{
+	return wpa_s->conf->hs20;
+}
 
 int is_hs20_network(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid,
 		    struct wpa_bss *bss)
 {
-	if (!wpa_s->conf->hs20 || !ssid)
+	if (!ssid)
 		return 0;
 
 	if (ssid->parent_cred)

wpa_supplicant/hs20_supplicant.h

@@ -22,6 +22,7 @@ void hs20_parse_rx_hs20_anqp_resp(struct wpa_supplicant *wpa_s,
 				  struct wpa_bss *bss, const u8 *sa,
 				  const u8 *data, size_t slen, u8 dialog_token);
 int get_hs20_version(struct wpa_bss *bss);
+int is_hs20_config(struct wpa_supplicant *wpa_s);
 int is_hs20_network(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid,
 		    struct wpa_bss *bss);
 int hs20_get_pps_mo_id(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid);

wpa_supplicant/sme.c

@@ -663,7 +663,7 @@ static void sme_send_authentication(struct wpa_supplicant *wpa_s,
 	}
 
 #ifdef CONFIG_HS20
-	if (is_hs20_network(wpa_s, ssid, bss)) {
+	if (is_hs20_config(wpa_s) && is_hs20_network(wpa_s, ssid, bss)) {
 		struct wpabuf *hs20;
 
 		hs20 = wpabuf_alloc(20 + MAX_ROAMING_CONS_OI_LEN);

wpa_supplicant/wpa_supplicant.c

@@ -1016,6 +1016,9 @@ void wpa_supplicant_set_state(struct wpa_supplicant *wpa_s,
 		if (ssid && (ssid->key_mgmt & WPA_KEY_MGMT_OWE))
 			wpas_update_owe_connect_params(wpa_s);
 #endif /* CONFIG_OWE */
+#ifdef CONFIG_HS20
+		hs20_configure_frame_filters(wpa_s);
+#endif
 	} else if (state == WPA_DISCONNECTED || state == WPA_ASSOCIATING ||
 		   state == WPA_ASSOCIATED) {
 		wpa_s->new_connection = 1;
@@ -3033,7 +3036,7 @@ static u8 * wpas_populate_assoc_ies(
 	}
 
 #ifdef CONFIG_HS20
-	if (is_hs20_network(wpa_s, ssid, bss)) {
+	if (is_hs20_config(wpa_s) && is_hs20_network(wpa_s, ssid, bss)) {
 		struct wpabuf *hs20;
 
 		hs20 = wpabuf_alloc(20 + MAX_ROAMING_CONS_OI_LEN);
@@ -3051,10 +3054,9 @@ static u8 * wpas_populate_assoc_ies(
 				wpa_ie_len += wpabuf_len(hs20);
 			}
 			wpabuf_free(hs20);
-
-			hs20_configure_frame_filters(wpa_s);
 		}
 	}
+	hs20_configure_frame_filters(wpa_s);
 #endif /* CONFIG_HS20 */
 
 	if (wpa_s->vendor_elem[VENDOR_ELEM_ASSOC_REQ]) {