net/vxlan: Use the underlying device index when joining/leaving multicast groups

The socket calls from vxlan to join/leave multicast group aren't
using the index of the underlying device, as a result the stack uses
the first interface that is up. This results in vxlan being non functional
over a device which isn't the 1st to be up.
Fix this by providing the iflink field to the vxlan instance
to the multicast calls.

Signed-off-by: Yan Burman <yanb@mellanox.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 3b3fdf648ea7..40f2cc135a49 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -505,7 +505,8 @@ static int vxlan_join_group(struct net_device *dev)
         struct vxlan_net *vn = net_generic(dev_net(dev), vxlan_net_id);
         struct sock *sk = vn->sock->sk;
         struct ip_mreqn mreq = {
-                .imr_multiaddr.s_addr = vxlan->gaddr,
+                .imr_multiaddr.s_addr   = vxlan->gaddr,
+                .imr_ifindex            = vxlan->link,
         };
         int err;
 
@@ -532,7 +533,8 @@ static int vxlan_leave_group(struct net_device *dev)
         int err = 0;
         struct sock *sk = vn->sock->sk;
         struct ip_mreqn mreq = {
-                .imr_multiaddr.s_addr = vxlan->gaddr,
+                .imr_multiaddr.s_addr   = vxlan->gaddr,
+                .imr_ifindex            = vxlan->link,
         };
 
         /* Only leave group when last vxlan is done. */