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ip6_pol_route panic: Do not allow VLAN on loopback

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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>
This commit is contained in:
Krishna Kumar 2011-04-14 06:07:04 +00:00 committed by David S. Miller
parent 70dda99c41
commit 0553c891fa
1 changed files with 2 additions and 1 deletions
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3
drivers/net/loopback.c
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@ -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;