wpa_supplicant: Notify freq change on CH_SWITCH

wpa_supplicant does not send a D-Bus notification of the BSS frequency
change when a CSA happens. Sending a PropertyChanged signal with the
updated frequency will notify the network manager quickly, instead of
waiting for the next scan results.

Signed-off-by: Arowa Suliman <arowa@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>

wpa_supplicant/bss.c

@@ -19,18 +19,6 @@
 #include "scan.h"
 #include "bss.h"
 
-
-#define WPA_BSS_FREQ_CHANGED_FLAG	BIT(0)
-#define WPA_BSS_SIGNAL_CHANGED_FLAG	BIT(1)
-#define WPA_BSS_PRIVACY_CHANGED_FLAG	BIT(2)
-#define WPA_BSS_MODE_CHANGED_FLAG	BIT(3)
-#define WPA_BSS_WPAIE_CHANGED_FLAG	BIT(4)
-#define WPA_BSS_RSNIE_CHANGED_FLAG	BIT(5)
-#define WPA_BSS_WPS_CHANGED_FLAG	BIT(6)
-#define WPA_BSS_RATES_CHANGED_FLAG	BIT(7)
-#define WPA_BSS_IES_CHANGED_FLAG	BIT(8)
-
-
 static void wpa_bss_set_hessid(struct wpa_bss *bss)
 {
 #ifdef CONFIG_INTERWORKING
@@ -588,8 +576,8 @@ static u32 wpa_bss_compare_res(const struct wpa_bss *old,
 }
 
 
-static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
-			       const struct wpa_bss *bss)
+void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
+			const struct wpa_bss *bss)
 {
 	if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
 		wpas_notify_bss_freq_changed(wpa_s, bss->id);

wpa_supplicant/bss.h

@@ -20,6 +20,16 @@ struct wpa_scan_res;
 #define WPA_BSS_ANQP_FETCH_TRIED	BIT(6)
 #define WPA_BSS_OWE_TRANSITION		BIT(7)
 
+#define WPA_BSS_FREQ_CHANGED_FLAG	BIT(0)
+#define WPA_BSS_SIGNAL_CHANGED_FLAG	BIT(1)
+#define WPA_BSS_PRIVACY_CHANGED_FLAG	BIT(2)
+#define WPA_BSS_MODE_CHANGED_FLAG	BIT(3)
+#define WPA_BSS_WPAIE_CHANGED_FLAG	BIT(4)
+#define WPA_BSS_RSNIE_CHANGED_FLAG	BIT(5)
+#define WPA_BSS_WPS_CHANGED_FLAG	BIT(6)
+#define WPA_BSS_RATES_CHANGED_FLAG	BIT(7)
+#define WPA_BSS_IES_CHANGED_FLAG	BIT(8)
+
 struct wpa_bss_anqp_elem {
 	struct dl_list list;
 	u16 infoid;
@@ -120,6 +130,8 @@ static inline const u8 * wpa_bss_ie_ptr(const struct wpa_bss *bss)
 	return bss->ies;
 }
 
+void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
+			const struct wpa_bss *bss);
 void wpa_bss_update_start(struct wpa_supplicant *wpa_s);
 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
 			     struct wpa_scan_res *res,

wpa_supplicant/events.c

@@ -4986,6 +4986,12 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
 
 		wpa_s->assoc_freq = data->ch_switch.freq;
 		wpa_s->current_ssid->frequency = data->ch_switch.freq;
+		if (wpa_s->current_bss &&
+		    wpa_s->current_bss->freq != data->ch_switch.freq) {
+			wpa_s->current_bss->freq = data->ch_switch.freq;
+			notify_bss_changes(wpa_s, WPA_BSS_FREQ_CHANGED_FLAG,
+					   wpa_s->current_bss);
+		}
 
 #ifdef CONFIG_SME
 		switch (data->ch_switch.ch_offset) {