hostapd: send a notification via ubus when CSA completed

Signed-off-by: John Crispin <john@phrozen.org>

package/network/services/hostapd/patches/600-ubus_support.patch

@@ -116,6 +116,14 @@ probe/assoc/auth requests via object subscribe.
  #ifdef CONFIG_P2P
  	if (elems.p2p) {
  		wpabuf_free(sta->p2p_ie);
+@@ -1369,6 +1379,7 @@ void hostapd_event_ch_switch(struct host
+ 
+ 		wpa_msg(hapd->msg_ctx, MSG_INFO, AP_CSA_FINISHED
+ 			"freq=%d dfs=%d", freq, is_dfs);
++		hostapd_ubus_notify_csa(hapd, freq);
+ 	} else if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) {
+ 		/* Complete AP configuration for the first bring up. */
+ 		if (is_dfs0 > 0 &&
 --- a/src/ap/hostapd.c
 +++ b/src/ap/hostapd.c
 @@ -475,6 +475,7 @@ void hostapd_free_hapd_data(struct hosta

package/network/services/hostapd/src/src/ap/ubus.c

@@ -2024,3 +2024,16 @@ void hostapd_ubus_notify_apup_newpeer(
 	ubus_notify(ctx, &hapd->ubus.obj, "apup-newpeer", b.head, -1);
 }
 #endif // def CONFIG_APUP
+
+void hostapd_ubus_notify_csa(struct hostapd_data *hapd, int freq)
+{
+	if (!hapd->ubus.obj.has_subscribers)
+		return;
+
+	blob_buf_init(&b, 0);
+	blobmsg_add_string(&b, "ifname", hapd->conf->iface);
+	blobmsg_add_u32(&b, "freq", freq);
+	blobmsg_printf(&b, "bssid", MACSTR, MAC2STR(hapd->conf->bssid));
+
+	ubus_notify(ctx, &hapd->ubus.obj, "channel-switch", b.head, -1);
+}

package/network/services/hostapd/src/src/ap/ubus.h

@@ -68,6 +68,7 @@ int hostapd_ubus_notify_bss_transition_query(
 	const u8 *candidate_list, u16 candidate_list_len);
 void hostapd_ubus_notify_authorized(struct hostapd_data *hapd, struct sta_info *sta,
 				    const char *auth_alg);
+void hostapd_ubus_notify_csa(struct hostapd_data *hapd, int freq);
 
 #ifdef CONFIG_APUP
 void hostapd_ubus_notify_apup_newpeer(
@@ -155,6 +156,11 @@ hostapd_ubus_notify_authorized(struct hostapd_data *hapd, struct sta_info *sta,
 {
 }
 
+static inline void
+hostapd_ubus_notify_csa(struct hostapd_data *hapd, int freq)
+{
+}
+
 #endif
 
 #endif