vxlan: set needed headroom correctly

vxlan_setup is called when allocating the net_device, i.e. way before
vxlan_newlink (or vxlan_dev_configure) is called. This means
vxlan->default_dst is actually unset in vxlan_setup and the condition that
sets needed_headroom always takes the else branch.

Set the needed_headrom at the point when we have the information about
the address family available.

Fixes: e4c7ed415387c ("vxlan: add ipv6 support")
Fixes: 2853af6a2ea1a ("vxlan: use dev->needed_headroom instead of dev->hard_header_len")
CC: Cong Wang <cwang@twopensource.com>
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index cf8b7f0..6ebe562 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2392,10 +2392,6 @@ static void vxlan_setup(struct net_device *dev)
 
        eth_hw_addr_random(dev);
        ether_setup(dev);
-       if (vxlan->default_dst.remote_ip.sa.sa_family == AF_INET6)
-               dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
-       else
-               dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
 
        dev->netdev_ops = &vxlan_netdev_ops;
        dev->destructor = free_netdev;
@@ -2670,8 +2666,12 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
 
                dev->needed_headroom = lowerdev->hard_header_len +
                                       (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
-       } else if (use_ipv6)
+       } else if (use_ipv6) {
                vxlan->flags |= VXLAN_F_IPV6;
+               dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
+       } else {
+               dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
+       }
 
        memcpy(&vxlan->cfg, conf, sizeof(*conf));
        if (!vxlan->cfg.dst_port)