vxlan: use dev->needed_headroom instead of dev->hard_header_len

When we mirror packets from a vxlan tunnel to other device,
the mirror device should see the same packets (that is, without
outer header). Because vxlan tunnel sets dev->hard_header_len,
tcf_mirred() resets mac header back to outer mac, the mirror device
actually sees packets with outer headers

Vxlan tunnel should set dev->needed_headroom instead of
dev->hard_header_len, like what other ip tunnels do. This fixes
the above problem.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: stephen hemminger <stephen@networkplumber.org>
Cc: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 1610d51dbb5c..e0995ffd046d 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2247,9 +2247,9 @@ 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->hard_header_len = ETH_HLEN + VXLAN6_HEADROOM;
+                dev->needed_headroom = ETH_HLEN + VXLAN6_HEADROOM;
         else
-                dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
+                dev->needed_headroom = ETH_HLEN + VXLAN_HEADROOM;
 
         dev->netdev_ops = &vxlan_netdev_ops;
         dev->destructor = free_netdev;
@@ -2646,8 +2646,7 @@ static int vxlan_newlink(struct net *net, struct net_device *dev,
                 if (!tb[IFLA_MTU])
                         dev->mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
 
-                /* update header length based on lower device */
-                dev->hard_header_len = lowerdev->hard_header_len +
+                dev->needed_headroom = lowerdev->hard_header_len +
                                        (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
         } else if (use_ipv6)
                 vxlan->flags |= VXLAN_F_IPV6;