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authorKrishna Kumar <krkumar2@in.ibm.com>2011-04-14 06:07:04 +0000
committerDavid S. Miller <davem@davemloft.net>2011-04-17 23:27:16 -0700
commit0553c891fabd287726b41076cfd03fe7e5ab596f (patch)
tree6b8b7074ff457e1533e8c397e09c03cd86ddc76e /drivers/net/loopback.c
parent70dda99c41fc8a153e09bdba9adb7805ba2a4bb3 (diff)
downloadlinux-0553c891fabd287726b41076cfd03fe7e5ab596f.tar.bz2
ip6_pol_route panic: Do not allow VLAN on loopback
Several tests in the ipv6 routing code check IFF_LOOPBACK, and allowing stacking such as VLAN'ing on top of loopback results in a netdevice which reports IFF_LOOPBACK but really isn't the loopback device. Instead of spamming the ipv6 routing code with even more special tests, simply disallow VLAN over loopback. The result of this patch is: # modprobe 8021q # vconfig add lo 43 ERROR: trying to add VLAN #43 to IF -:lo:- error: Operation not supported Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/loopback.c')
-rw-r--r--drivers/net/loopback.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index ea0dc451da9c..d70fb76edb77 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -173,7 +173,8 @@ static void loopback_setup(struct net_device *dev)
| NETIF_F_RXCSUM
| NETIF_F_HIGHDMA
| NETIF_F_LLTX
- | NETIF_F_NETNS_LOCAL;
+ | NETIF_F_NETNS_LOCAL
+ | NETIF_F_VLAN_CHALLENGED;
dev->ethtool_ops = &loopback_ethtool_ops;
dev->header_ops = &eth_header_ops;
dev->netdev_ops = &loopback_ops;