Add option to disable broadcast deauth in hostapd on AP start/stop

The new broadcast_deauth parameter can be used to disable sending of the
Deauthentication frame whenever AP is started or stopped. The default
behavior remains identical to the past behavior (broadcast_deauth=1).

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

hostapd/config_file.c

@@ -3673,6 +3673,8 @@ static int hostapd_config_fill(struct hostapd_config *conf,
 #endif /* CONFIG_FILS */
 	} else if (os_strcmp(buf, "multicast_to_unicast") == 0) {
 		bss->multicast_to_unicast = atoi(pos);
+	} else if (os_strcmp(buf, "broadcast_deauth") == 0) {
+		bss->broadcast_deauth = atoi(pos);
 	} else {
 		wpa_printf(MSG_ERROR,
 			   "Line %d: unknown configuration item '%s'",

hostapd/hostapd.conf

@@ -511,6 +511,10 @@ wmm_ac_vo_acm=0
 #
 #multicast_to_unicast=0
 
+# Send broadcast Deauthentication frame on AP start/stop
+# Default: 1 (enabled)
+#broadcast_deauth=1
+
 ##### IEEE 802.11n related configuration ######################################
 
 # ieee80211n: Whether IEEE 802.11n (HT) is enabled

src/ap/ap_config.c

@@ -107,6 +107,8 @@ void hostapd_config_defaults_bss(struct hostapd_bss_config *bss)
 	bss->dhcp_server_port = DHCP_SERVER_PORT;
 	bss->dhcp_relay_port = DHCP_SERVER_PORT;
 #endif /* CONFIG_FILS */
+
+	bss->broadcast_deauth = 1;
 }
 
 

src/ap/ap_config.h

@@ -617,6 +617,8 @@ struct hostapd_bss_config {
 #endif /* CONFIG_FILS */
 
 	int multicast_to_unicast;
+
+	int broadcast_deauth;
 };
 
 /**

src/ap/hostapd.c

@@ -491,9 +491,12 @@ static int hostapd_flush_old_stations(struct hostapd_data *hapd, u16 reason)
 			ret = -1;
 		}
 	}
-	wpa_dbg(hapd->msg_ctx, MSG_DEBUG, "Deauthenticate all stations");
-	os_memset(addr, 0xff, ETH_ALEN);
-	hostapd_drv_sta_deauth(hapd, addr, reason);
+	if (hapd->conf && hapd->conf->broadcast_deauth) {
+		wpa_dbg(hapd->msg_ctx, MSG_DEBUG,
+			"Deauthenticate all stations");
+		os_memset(addr, 0xff, ETH_ALEN);
+		hostapd_drv_sta_deauth(hapd, addr, reason);
+	}
 	hostapd_free_stas(hapd);
 
 	return ret;