[VLAN]: Fix MAC address handling

The VLAN MAC address handling is broken in multiple ways. When the address
differs when setting it, the real device is put in promiscous mode twice,
but never taken out again. Additionally it doesn't resync when the real
device's address is changed and needlessly puts it in promiscous mode when
the vlan device is still down.

Fix by moving address handling to vlan_dev_open/vlan_dev_stop and properly
deal with address changes in the device notifier. Also switch to
dev_unicast_add (which needs the exact same handling).

Since the set_mac_address handler is identical to the generic ethernet one
with these changes, kill it and use ether_setup().

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 5 deletions

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index e7583ee..b463ba4 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -345,12 +345,8 @@ static int vlan_dev_init(struct net_device *dev)
 					  (1<<__LINK_STATE_DORMANT))) |
 		      (1<<__LINK_STATE_PRESENT);
 
-	/* TODO: maybe just assign it to be ETHERNET? */
-	dev->type = real_dev->type;
-
 	memcpy(dev->broadcast, real_dev->broadcast, real_dev->addr_len);
 	memcpy(dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
-	dev->addr_len = real_dev->addr_len;
 
 	if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 		dev->hard_header     = real_dev->hard_header;
@@ -364,6 +360,7 @@ static int vlan_dev_init(struct net_device *dev)
 		dev->rebuild_header  = vlan_dev_rebuild_header;
 	}
 	dev->hard_header_parse = real_dev->hard_header_parse;
+	dev->hard_header_cache = NULL;
 
 	lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
 	return 0;
@@ -373,6 +370,8 @@ void vlan_setup(struct net_device *new_dev)
 {
 	SET_MODULE_OWNER(new_dev);
 
+	ether_setup(new_dev);
+
 	/* new_dev->ifindex = 0;  it will be set when added to
 	 * the global list.
 	 * iflink is set as well.
@@ -392,7 +391,6 @@ void vlan_setup(struct net_device *new_dev)
 	new_dev->init = vlan_dev_init;
 	new_dev->open = vlan_dev_open;
 	new_dev->stop = vlan_dev_stop;
-	new_dev->set_mac_address = vlan_dev_set_mac_address;
 	new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 	new_dev->destructor = free_netdev;
 	new_dev->do_ioctl = vlan_dev_ioctl;
@@ -592,6 +590,30 @@ out_free_newdev:
 	return err;
 }
 
+static void vlan_sync_address(struct net_device *dev,
+			      struct net_device *vlandev)
+{
+	struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
+
+	/* May be called without an actual change */
+	if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
+		return;
+
+	/* vlan address was different from the old address and is equal to
+	 * the new address */
+	if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
+	    !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
+		dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
+
+	/* vlan address was equal to the old address and is different from
+	 * the new address */
+	if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
+	    compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
+		dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
+
+	memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
+}
+
 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 {
 	struct net_device *dev = ptr;
@@ -618,6 +640,17 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 		}
 		break;
 
+	case NETDEV_CHANGEADDR:
+		/* Adjust unicast filters on underlying device */
+		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
+			vlandev = vlan_group_get_device(grp, i);
+			if (!vlandev)
+				continue;
+
+			vlan_sync_address(dev, vlandev);
+		}
+		break;
+
 	case NETDEV_DOWN:
 		/* Put all VLANs for this dev in the down state too.  */
 		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {