P2P: Add mechanism for updating P2P channel list based on driver events

This allows P2P channel list to be updated whenever the driver changes
its list of allowed channels, e.g., based on country code from scan
results.

src/drivers/driver.h

@@ -2203,7 +2203,16 @@ enum wpa_event_type {
 	 * This event is used to indicate that the interface was disabled,
 	 * e.g., due to rfkill.
 	 */
-	EVENT_INTERFACE_DISABLED
+	EVENT_INTERFACE_DISABLED,
+
+	/**
+	 * EVENT_CHANNEL_LIST_CHANGED - Channel list changed
+	 *
+	 * This event is used to indicate that the channel list has changed,
+	 * e.g., because of a regulatory domain change triggered by scan
+	 * results including an AP advertising a country code.
+	 */
+	EVENT_CHANNEL_LIST_CHANGED
 };
 
 

src/p2p/p2p.c

@@ -3036,3 +3036,10 @@ void p2p_set_intra_bss_dist(struct p2p_data *p2p, int enabled)
 		enabled ? "enabled" : "disabled");
 	p2p->cfg->p2p_intra_bss = enabled;
 }
+
+
+void p2p_update_channel_list(struct p2p_data *p2p, struct p2p_channels *chan)
+{
+	wpa_msg(p2p->cfg->msg_ctx, MSG_DEBUG, "P2P: Update channel list");
+	os_memcpy(&p2p->cfg->channels, chan, sizeof(struct p2p_channels));
+}

src/p2p/p2p.h

@@ -1263,4 +1263,6 @@ void p2p_set_intra_bss_dist(struct p2p_data *p2p, int enabled);
  */
 int p2p_supported_freq(struct p2p_data *p2p, unsigned int freq);
 
+void p2p_update_channel_list(struct p2p_data *p2p, struct p2p_channels *chan);
+
 #endif /* P2P_H */

wpa_supplicant/events.c

@@ -1829,6 +1829,11 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
 		wpa_supplicant_mark_disassoc(wpa_s);
 		wpa_supplicant_set_state(wpa_s, WPA_INTERFACE_DISABLED);
 		break;
+	case EVENT_CHANNEL_LIST_CHANGED:
+#ifdef CONFIG_P2P
+		wpas_p2p_update_channel_list(wpa_s);
+#endif /* CONFIG_P2P */
+		break;
 	default:
 		wpa_printf(MSG_INFO, "Unknown event %d", event);
 		break;

wpa_supplicant/p2p_supplicant.c

@@ -3599,3 +3599,21 @@ int wpas_p2p_notif_pbc_overlap(struct wpa_supplicant *wpa_s)
 	wpas_group_formation_completed(wpa_s, 0);
 	return 1;
 }
+
+
+void wpas_p2p_update_channel_list(struct wpa_supplicant *wpa_s)
+{
+	struct p2p_channels chan;
+
+	if (wpa_s->global == NULL || wpa_s->global->p2p == NULL)
+		return;
+
+	os_memset(&chan, 0, sizeof(chan));
+	if (wpas_p2p_setup_channels(wpa_s, &chan)) {
+		wpa_printf(MSG_ERROR, "P2P: Failed to update supported "
+			   "channel list");
+		return;
+	}
+
+	p2p_update_channel_list(wpa_s->global->p2p, &chan);
+}

wpa_supplicant/p2p_supplicant.h

@@ -113,5 +113,6 @@ int wpas_p2p_set_cross_connect(struct wpa_supplicant *wpa_s, int enabled);
 void wpas_p2p_notif_connected(struct wpa_supplicant *wpa_s);
 void wpas_p2p_notif_disconnected(struct wpa_supplicant *wpa_s);
 int wpas_p2p_notif_pbc_overlap(struct wpa_supplicant *wpa_s);
+void wpas_p2p_update_channel_list(struct wpa_supplicant *wpa_s);
 
 #endif /* P2P_SUPPLICANT_H */