vlan: Propagate MAC address to VLANs

The MAC address of the physical interface is only copied to the VLAN
when it is first created, resulting in an inconsistency after MAC
address changes of only newly created VLANs having an up-to-date MAC.

The VLANs should continue inheriting the MAC address of the physical
interface until the VLAN MAC address is explicitly set to any value.
This allows IPv6 EUI64 addresses for the VLAN to reflect any changes
to the MAC of the physical interface and thus for DAD to behave as
expected.

Signed-off-by: Mike Manning <mmanning@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index a1e273af6fc81660dfd5ad088cb5b0ee336d650d..82a116ba590eb5d289a76f73ca09f1cab9b4fdf5 100644 (file)
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -290,6 +290,10 @@ static void vlan_sync_address(struct net_device *dev,
        if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
                return;
 
+       /* vlan continues to inherit address of lower device */
+       if (vlan_dev_inherit_address(vlandev, dev))
+               goto out;
+
        /* vlan address was different from the old address and is equal to
         * the new address */
        if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
@@ -302,6 +306,7 @@ static void vlan_sync_address(struct net_device *dev,
            !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
                dev_uc_add(dev, vlandev->dev_addr);
 
+out:
        ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 }
 

diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index 9d010a09ab9880a6eb15cee0524b46be53d76587..cc15579780669a613165336387a3f8eabc669dec 100644 (file)
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -109,6 +109,8 @@ int vlan_check_real_dev(struct net_device *real_dev,
 void vlan_setup(struct net_device *dev);
 int register_vlan_dev(struct net_device *dev);
 void unregister_vlan_dev(struct net_device *dev, struct list_head *head);
+bool vlan_dev_inherit_address(struct net_device *dev,
+                             struct net_device *real_dev);
 
 static inline u32 vlan_get_ingress_priority(struct net_device *dev,
                                            u16 vlan_tci)

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index e7e62570bdb869f64e7198c53357e18702165bf1..86ae75b77390964ee42056c0dd1763650d9fb9ff 100644 (file)
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -245,6 +245,17 @@ void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)
        strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23);
 }
 
+bool vlan_dev_inherit_address(struct net_device *dev,
+                             struct net_device *real_dev)
+{
+       if (dev->addr_assign_type != NET_ADDR_STOLEN)
+               return false;
+
+       ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
+       call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
+       return true;
+}
+
 static int vlan_dev_open(struct net_device *dev)
 {
        struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
@@ -255,7 +266,8 @@ static int vlan_dev_open(struct net_device *dev)
            !(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
                return -ENETDOWN;
 
-       if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr)) {
+       if (!ether_addr_equal(dev->dev_addr, real_dev->dev_addr) &&
+           !vlan_dev_inherit_address(dev, real_dev)) {
                err = dev_uc_add(real_dev, dev->dev_addr);
                if (err < 0)
                        goto out;
@@ -560,8 +572,10 @@ static int vlan_dev_init(struct net_device *dev)
        /* ipv6 shared card related stuff */
        dev->dev_id = real_dev->dev_id;
 
-       if (is_zero_ether_addr(dev->dev_addr))
-               eth_hw_addr_inherit(dev, real_dev);
+       if (is_zero_ether_addr(dev->dev_addr)) {
+               ether_addr_copy(dev->dev_addr, real_dev->dev_addr);
+               dev->addr_assign_type = NET_ADDR_STOLEN;
+       }
        if (is_zero_ether_addr(dev->broadcast))
                memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);