[PATCH net-next] vxlan: tun_id is 64bit, not 32bit

[Jiri Benc]

The tun_id field in struct ip_tunnel_key is __be64, not __be32. We need to
convert the vni to tun_id correctly.

Fixes: 54bfd872bf16 ("vxlan: keep flags and vni in network byte order")
Reported-by: Paolo Abeni <pab...@redhat.com>
Tested-by: Paolo Abeni <pab...@redhat.com>
Signed-off-by: Jiri Benc <jb...@redhat.com>
---
 drivers/net/vxlan.c | 5 +++--
 include/net/vxlan.h | 9 +++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 3a84680b5117..75bccb360599 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1310,9 +1310,10 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct 
sk_buff *skb)
                goto drop;
 
        if (vxlan_collect_metadata(vs)) {
+               __be32 vni = vxlan_vni(vxlan_hdr(skb)->vx_vni);
+
                tun_dst = udp_tun_rx_dst(skb, vxlan_get_sk_family(vs), 
TUNNEL_KEY,
-                                        vxlan_vni(vxlan_hdr(skb)->vx_vni),
-                                        sizeof(*md));
+                                        vxlan_vni_to_tun_id(vni), sizeof(*md));
 
                if (!tun_dst)
                        goto drop;
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
index 1b85a3b40c5a..748083de367a 100644
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -294,6 +294,15 @@ static inline __be32 vxlan_tun_id_to_vni(__be64 tun_id)
 #endif
 }
 
+static inline __be64 vxlan_vni_to_tun_id(__be32 vni)
+{
+#if defined(__BIG_ENDIAN)
+       return (__be64)vni;
+#else
+       return (__be64)vni << 32;
+#endif
+}
+
 static inline size_t vxlan_rco_start(__be32 vni_field)
 {
        return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
-- 
1.8.3.1