Add a test framework for various wpa_supplicant failure cases

For CONFIG_TESTING_OPTIONS=y builds, add a new test parameter than can
be used to trigger various error cases within wpa_supplicant operations
to make it easier to test error path processing. "SET test_failure
<val>" is used to set which operation fails. For now, 0 = no failures
and 1 = scan trigger fails with EBUSY. More operations can be added in
the future to extend coverage.

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

wpa_supplicant/ctrl_iface.c

@@ -437,6 +437,8 @@ static int wpa_supplicant_ctrl_iface_set(struct wpa_supplicant *wpa_s,
 #endif /* CONFIG_AP */
 	} else if (os_strcasecmp(cmd, "extra_roc_dur") == 0) {
 		wpa_s->extra_roc_dur = atoi(value);
+	} else if (os_strcasecmp(cmd, "test_failure") == 0) {
+		wpa_s->test_failure = atoi(value);
 #endif /* CONFIG_TESTING_OPTIONS */
 #ifndef CONFIG_NO_CONFIG_BLOBS
 	} else if (os_strcmp(cmd, "blob") == 0) {
@@ -6195,6 +6197,7 @@ static void wpa_supplicant_ctrl_iface_flush(struct wpa_supplicant *wpa_s)
 	wpa_s->ext_eapol_frame_io = 0;
 #ifdef CONFIG_TESTING_OPTIONS
 	wpa_s->extra_roc_dur = 0;
+	wpa_s->test_failure = WPAS_TEST_FAILURE_NONE;
 #endif /* CONFIG_TESTING_OPTIONS */
 
 	wpa_s->disconnected = 0;

wpa_supplicant/driver_i.h

@@ -90,6 +90,10 @@ static inline int wpa_drv_leave_mesh(struct wpa_supplicant *wpa_s)
 static inline int wpa_drv_scan(struct wpa_supplicant *wpa_s,
 			       struct wpa_driver_scan_params *params)
 {
+#ifdef CONFIG_TESTING_OPTIONS
+	if (wpa_s->test_failure == WPAS_TEST_FAILURE_SCAN_TRIGGER)
+		return -EBUSY;
+#endif /* CONFIG_TESTING_OPTIONS */
 	if (wpa_s->driver->scan2)
 		return wpa_s->driver->scan2(wpa_s->drv_priv, params);
 	return -1;

wpa_supplicant/wpa_supplicant_i.h

@@ -403,6 +403,11 @@ struct rrm_data {
 	u8 next_neighbor_rep_token;
 };
 
+enum wpa_supplicant_test_failure {
+	WPAS_TEST_FAILURE_NONE,
+	WPAS_TEST_FAILURE_SCAN_TRIGGER,
+};
+
 /**
  * struct wpa_supplicant - Internal data for wpa_supplicant interface
  *
@@ -940,6 +945,7 @@ struct wpa_supplicant {
 #ifdef CONFIG_TESTING_OPTIONS
 	struct l2_packet_data *l2_test;
 	unsigned int extra_roc_dur;
+	enum wpa_supplicant_test_failure test_failure;
 #endif /* CONFIG_TESTING_OPTIONS */
 
 	struct wmm_ac_assoc_data *wmm_ac_assoc_info;