mac80211: manage AP netdev carrier state

The AP netdev is really only active when beaconing, so
manage the carrier state accordingly. Also do that for
VLAN interfaces enslaved to a given AP interface.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/cfg.c

@@ -644,6 +644,10 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
 
 	ieee80211_bss_info_change_notify(sdata, changed);
 
+	netif_carrier_on(dev);
+	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
+		netif_carrier_on(vlan->dev);
+
 	return 0;
 }
 
@@ -669,7 +673,7 @@ static int ieee80211_change_beacon(struct wiphy *wiphy, struct net_device *dev,
 
 static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
 {
-	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_sub_if_data *sdata, *vlan;
 	struct beacon_data *old;
 
 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
@@ -678,6 +682,10 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
 	if (!old)
 		return -ENOENT;
 
+	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
+		netif_carrier_off(vlan->dev);
+	netif_carrier_off(dev);
+
 	RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 
 	kfree_rcu(old, rcu_head);

net/mac80211/iface.c

@@ -254,7 +254,11 @@ static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 
 	switch (sdata->vif.type) {
 	case NL80211_IFTYPE_AP_VLAN:
-		/* no need to tell driver */
+		/* no need to tell driver, but set carrier */
+		if (rtnl_dereference(sdata->bss->beacon))
+			netif_carrier_on(dev);
+		else
+			netif_carrier_off(dev);
 		break;
 	case NL80211_IFTYPE_MONITOR:
 		if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
@@ -294,7 +298,8 @@ static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 		ieee80211_bss_info_change_notify(sdata, changed);
 
 		if (sdata->vif.type == NL80211_IFTYPE_STATION ||
-		    sdata->vif.type == NL80211_IFTYPE_ADHOC)
+		    sdata->vif.type == NL80211_IFTYPE_ADHOC ||
+		    sdata->vif.type == NL80211_IFTYPE_AP)
 			netif_carrier_off(dev);
 		else
 			netif_carrier_on(dev);