path: root/drivers/net/vrf.c
diff options
authorDavid Ahern <dsa@cumulusnetworks.com>2017-04-26 07:58:22 -0700
committerDavid S. Miller <davem@davemloft.net>2017-04-27 16:49:43 -0400
commit26d31ac11fa47a0ee8dc4c64136ea34feda57e3e (patch)
tree2472181ae9570ec21f0bdcf12dc10da782eb172e /drivers/net/vrf.c
parentfib_rules: fix error return code (diff)
net: vrf: Do not allow looback to be moved to a VRF
Moving the loopback into a VRF breaks networking for the default VRF. Since the VRF device is the loopback for VRF domains, there is no reason to move the loopback. Given the repercussions, block attempts to set lo into a VRF. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Reviewed-by: Greg Rose <gvrose8192@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/vrf.c')
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index aa5d30428bba..ceda5861da78 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -877,6 +877,12 @@ static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
int ret;
+ /* do not allow loopback device to be enslaved to a VRF.
+ * The vrf device acts as the loopback for the vrf.
+ */
+ if (port_dev == dev_net(dev)->loopback_dev)
+ return -EOPNOTSUPP;
port_dev->priv_flags |= IFF_L3MDEV_SLAVE;
ret = netdev_master_upper_dev_link(port_dev, dev, NULL, NULL);
if (ret < 0)