Add bridge handling for WDS STA interfaces

By default, add them to the configured bridge of the AP interface
(if present), but allow the user to specify a separate bridge.

hostapd/config_file.c

@@ -1208,6 +1208,9 @@ struct hostapd_config * hostapd_config_read(const char *fname)
 				   sizeof(conf->bss[0].iface));
 		} else if (os_strcmp(buf, "bridge") == 0) {
 			os_strlcpy(bss->bridge, pos, sizeof(bss->bridge));
+		} else if (os_strcmp(buf, "wds_bridge") == 0) {
+			os_strlcpy(bss->wds_bridge, pos,
+				   sizeof(bss->wds_bridge));
 		} else if (os_strcmp(buf, "driver") == 0) {
 			int j;
 			/* clear to get error below if setting is invalid */

hostapd/hostapd.conf

@@ -352,6 +352,11 @@ wmm_ac_vo_acm=0
 # bridging to be used.
 #wds_sta=1
 
+# If bridge parameter is set, the WDS STA interface will be added to the same
+# bridge by default. This can be overridden with the wds_bridge parameter to
+# use a separate bridge.
+#wds_bridge=wds-br0
+
 ##### IEEE 802.11n related configuration ######################################
 
 # ieee80211n: Whether IEEE 802.11n (HT) is enabled

src/ap/ap_config.h

@@ -148,6 +148,7 @@ struct hostapd_wmm_ac_params {
 struct hostapd_bss_config {
 	char iface[IFNAMSIZ + 1];
 	char bridge[IFNAMSIZ + 1];
+	char wds_bridge[IFNAMSIZ + 1];
 
 	enum hostapd_logger_level logger_syslog_level, logger_stdout_level;
 

src/ap/ap_drv_ops.c

@@ -366,9 +366,15 @@ static int hostapd_vlan_if_remove(struct hostapd_data *hapd,
 static int hostapd_set_wds_sta(struct hostapd_data *hapd, const u8 *addr,
 			       int aid, int val)
 {
+	const char *bridge = NULL;
+
 	if (hapd->driver == NULL || hapd->driver->set_wds_sta == NULL)
 		return 0;
-	return hapd->driver->set_wds_sta(hapd->drv_priv, addr, aid, val);
+	if (hapd->conf->wds_bridge[0])
+		bridge = hapd->conf->wds_bridge;
+	else if (hapd->conf->bridge[0])
+		bridge = hapd->conf->bridge;
+	return hapd->driver->set_wds_sta(hapd->drv_priv, addr, aid, val, bridge);
 }
 
 

src/drivers/driver.h

@@ -1698,9 +1698,12 @@ struct wpa_driver_ops {
 	 * @addr: MAC address of the associated station
 	 * @aid: Association ID
 	 * @val: 1 = bind to 4-address WDS; 0 = unbind
+	 * @bridge_ifname: Bridge interface to use for the WDS station or %NULL
+	 *	to indicate that bridge is not to be used
 	 * Returns: 0 on success, -1 on failure
 	 */
-	int (*set_wds_sta)(void *priv, const u8 *addr, int aid, int val);
+	int (*set_wds_sta)(void *priv, const u8 *addr, int aid, int val,
+	                   const char *bridge_ifname);
 
 	/**
 	 * send_action - Transmit an Action frame

src/drivers/driver_nl80211.c

@@ -4977,7 +4977,8 @@ static int i802_set_sta_vlan(void *priv, const u8 *addr,
 }
 
 
-static int i802_set_wds_sta(void *priv, const u8 *addr, int aid, int val)
+static int i802_set_wds_sta(void *priv, const u8 *addr, int aid, int val,
+                            const char *bridge_ifname)
 {
 	struct i802_bss *bss = priv;
 	struct wpa_driver_nl80211_data *drv = bss->drv;
@@ -4987,10 +4988,16 @@ static int i802_set_wds_sta(void *priv, const u8 *addr, int aid, int val)
 	wpa_printf(MSG_DEBUG, "nl80211: Set WDS STA addr=" MACSTR
 		   " aid=%d val=%d name=%s", MAC2STR(addr), aid, val, name);
 	if (val) {
-		if (!if_nametoindex(name) &&
-		    nl80211_create_iface(drv, name, NL80211_IFTYPE_AP_VLAN,
-					 NULL, 1) < 0)
-			return -1;
+		if (!if_nametoindex(name)) {
+			if (nl80211_create_iface(drv, name,
+						 NL80211_IFTYPE_AP_VLAN,
+						 NULL, 1) < 0)
+				return -1;
+			if (bridge_ifname &&
+			    linux_br_add_if(drv->ioctl_sock, bridge_ifname,
+					    name) < 0)
+				return -1;
+		}
 		linux_set_iface_flags(drv->ioctl_sock, name, 1);
 		return i802_set_sta_vlan(priv, addr, name, 0);
 	} else {