openvswitch: Fix egress tunnel info.

While transitioning to netdev based vport we broke OVS
feature which allows user to retrieve tunnel packet egress
information for lwtunnel devices.  Following patch fixes it
by introducing ndo operation to get the tunnel egress info.
Same ndo operation can be used for lwtunnel devices and compat
ovs-tnl-vport devices. So after adding such device operation
we can remove similar operation from ovs-vport.

Fixes: 614732eaa12d ("openvswitch: Use regular VXLAN net_device device").
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 32 insertions, 0 deletions

diff --git a/include/net/dst_metadata.h b/include/net/dst_metadata.h
index af9d5382f6cb..ce009710120c 100644
--- a/include/net/dst_metadata.h
+++ b/include/net/dst_metadata.h
@@ -60,6 +60,38 @@ static inline struct metadata_dst *tun_rx_dst(int md_size)
 	return tun_dst;
 }
 
+static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
+{
+	struct metadata_dst *md_dst = skb_metadata_dst(skb);
+	int md_size = md_dst->u.tun_info.options_len;
+	struct metadata_dst *new_md;
+
+	if (!md_dst)
+		return ERR_PTR(-EINVAL);
+
+	new_md = metadata_dst_alloc(md_size, GFP_ATOMIC);
+	if (!new_md)
+		return ERR_PTR(-ENOMEM);
+
+	memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
+	       sizeof(struct ip_tunnel_info) + md_size);
+	skb_dst_drop(skb);
+	dst_hold(&new_md->dst);
+	skb_dst_set(skb, &new_md->dst);
+	return new_md;
+}
+
+static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb)
+{
+	struct metadata_dst *dst;
+
+	dst = tun_dst_unclone(skb);
+	if (IS_ERR(dst))
+		return NULL;
+
+	return &dst->u.tun_info;
+}
+
 static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
 						 __be16 flags,
 						 __be64 tunnel_id,