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path: root/drivers/net/macvlan.c
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Diffstat (limited to 'drivers/net/macvlan.c')
-rw-r--r--drivers/net/macvlan.c84
1 files changed, 66 insertions, 18 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 7e24b5048686..70d3ef4a2c5f 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -60,6 +60,47 @@ static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
return NULL;
}
+static void macvlan_hash_add(struct macvlan_dev *vlan)
+{
+ struct macvlan_port *port = vlan->port;
+ const unsigned char *addr = vlan->dev->dev_addr;
+
+ hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
+}
+
+static void macvlan_hash_del(struct macvlan_dev *vlan)
+{
+ hlist_del_rcu(&vlan->hlist);
+ synchronize_rcu();
+}
+
+static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
+ const unsigned char *addr)
+{
+ macvlan_hash_del(vlan);
+ /* Now that we are unhashed it is safe to change the device
+ * address without confusing packet delivery.
+ */
+ memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
+ macvlan_hash_add(vlan);
+}
+
+static int macvlan_addr_busy(const struct macvlan_port *port,
+ const unsigned char *addr)
+{
+ /* Test to see if the specified multicast address is
+ * currently in use by the underlying device or
+ * another macvlan.
+ */
+ if (memcmp(port->dev->dev_addr, addr, ETH_ALEN) == 0)
+ return 1;
+
+ if (macvlan_hash_lookup(port, addr))
+ return 1;
+
+ return 0;
+}
+
static void macvlan_broadcast(struct sk_buff *skb,
const struct macvlan_port *port)
{
@@ -184,10 +225,13 @@ static const struct header_ops macvlan_hard_header_ops = {
static int macvlan_open(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
- struct macvlan_port *port = vlan->port;
struct net_device *lowerdev = vlan->lowerdev;
int err;
+ err = -EBUSY;
+ if (macvlan_addr_busy(vlan->port, dev->dev_addr))
+ goto out;
+
err = dev_unicast_add(lowerdev, dev->dev_addr, ETH_ALEN);
if (err < 0)
goto out;
@@ -196,8 +240,7 @@ static int macvlan_open(struct net_device *dev)
if (err < 0)
goto del_unicast;
}
-
- hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[dev->dev_addr[5]]);
+ macvlan_hash_add(vlan);
return 0;
del_unicast:
@@ -217,8 +260,7 @@ static int macvlan_stop(struct net_device *dev)
dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
- hlist_del_rcu(&vlan->hlist);
- synchronize_rcu();
+ macvlan_hash_del(vlan);
return 0;
}
@@ -232,16 +274,21 @@ static int macvlan_set_mac_address(struct net_device *dev, void *p)
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
- if (!(dev->flags & IFF_UP))
- goto out;
+ if (!(dev->flags & IFF_UP)) {
+ /* Just copy in the new address */
+ memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
+ } else {
+ /* Rehash and update the device filters */
+ if (macvlan_addr_busy(vlan->port, addr->sa_data))
+ return -EBUSY;
- err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN);
- if (err < 0)
- return err;
- dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
+ if ((err = dev_unicast_add(lowerdev, addr->sa_data, ETH_ALEN)))
+ return err;
-out:
- memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
+ dev_unicast_delete(lowerdev, dev->dev_addr, ETH_ALEN);
+
+ macvlan_hash_change_addr(vlan, addr->sa_data);
+ }
return 0;
}
@@ -461,12 +508,13 @@ static int macvlan_newlink(struct net_device *dev,
if (lowerdev == NULL)
return -ENODEV;
- /* Don't allow macvlans on top of other macvlans - its not really
- * wrong, but lockdep can't handle it and its not useful for anything
- * you couldn't do directly on top of the real device.
+ /* When creating macvlans on top of other macvlans - use
+ * the real device as the lowerdev.
*/
- if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops)
- return -ENODEV;
+ if (lowerdev->rtnl_link_ops == dev->rtnl_link_ops) {
+ struct macvlan_dev *lowervlan = netdev_priv(lowerdev);
+ lowerdev = lowervlan->lowerdev;
+ }
if (!tb[IFLA_MTU])
dev->mtu = lowerdev->mtu;