net: allow macvlans to move to net namespace

[ Upstream commit 0d0162e7a33d3710b9604e7c68c0f31f5c457428 ]

I cannot move a macvlan interface created on top of a bonding interface
to a different namespace:

% ip netns add dummy0
% ip link add link bond0 mac0 type macvlan
% ip link set mac0 netns dummy0
RTNETLINK answers: Invalid argument
%

The problem seems to be that commit f9399814927a ("bonding: Don't allow
bond devices to change network namespaces.") sets NETIF_F_NETNS_LOCAL
on bonding interfaces, and commit 797f87f83b60 ("macvlan: fix netdev
feature propagation from lower device") causes macvlan interfaces
to inherit its features from the lower device.

NETIF_F_NETNS_LOCAL should not be inherited from the lower device
by a macvlan.
Patch tested on 3.16.

Signed-off-by: Francesco Ruggeri <fruggeri@arista.com>
Acked-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 7f1abb7c18f2d522056ea2997b0e8a2d6b6f91da..fbf7dcdc22b0981068722a371ff06b1fd0c8ad0a 100644 (file)
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -709,6 +709,7 @@ static netdev_features_t macvlan_fix_features(struct net_device *dev,
                                             features,
                                             mask);
        features |= ALWAYS_ON_FEATURES;
+       features &= ~NETIF_F_NETNS_LOCAL;
 
        return features;
 }