Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux

[safe/jmp/linux-2.6] / net / bridge / br_if.c

diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 2117e5b..a2cbe61 100644 (file)
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -377,15 +377,23 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
        struct net_bridge_port *p;
        int err = 0;
 
-       if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
+       /* Don't allow bridging non-ethernet like devices */
+       if ((dev->flags & IFF_LOOPBACK) ||
+           dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN)
                return -EINVAL;
 
+       /* No bridging of bridges */
        if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
                return -ELOOP;
 
+       /* Device is already being bridged */
        if (dev->br_port != NULL)
                return -EBUSY;
 
+       /* No bridging devices that dislike that (e.g. wireless) */
+       if (dev->priv_flags & IFF_DONT_BRIDGE)
+               return -EOPNOTSUPP;
+
        p = new_nbp(br, dev);
        if (IS_ERR(p))
                return PTR_ERR(p);