tunnels: Allow IPv6 UDP checksums to be correctly controlled.

[ Upstream commit 35e2d1152b22eae99c961affbe85374bef05a775 ]

When configuring checksums on UDP tunnels, the flags are different
for IPv4 vs. IPv6 (and reversed). However, when lightweight tunnels
are enabled the flags used are always the IPv4 versions, which are
ignored in the IPv6 code paths. This uses the correct IPv6 flags, so
checksums can be controlled appropriately.

Fixes: a725e514 ("vxlan: metadata based tunneling for IPv6")
Fixes: abe492b4 ("geneve: UDP checksum configuration via netlink")
Signed-off-by: Jesse Gross <jesse@kernel.org>
Acked-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 405a7b6cca2560219d490d9e1597138c0c85259e..e0fcda4ddd55a401b5aedc9e4d79ace206758afb 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1984,11 +1984,6 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
                                     vxlan->cfg.port_max, true);
 
        if (info) {
-               if (info->key.tun_flags & TUNNEL_CSUM)
-                       flags |= VXLAN_F_UDP_CSUM;
-               else
-                       flags &= ~VXLAN_F_UDP_CSUM;
-
                ttl = info->key.ttl;
                tos = info->key.tos;
 
@@ -2003,8 +1998,15 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
                        goto drop;
                sk = vxlan->vn4_sock->sock->sk;
 
-               if (info && (info->key.tun_flags & TUNNEL_DONT_FRAGMENT))
-                       df = htons(IP_DF);
+               if (info) {
+                       if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
+                               df = htons(IP_DF);
+
+                       if (info->key.tun_flags & TUNNEL_CSUM)
+                               flags |= VXLAN_F_UDP_CSUM;
+                       else
+                               flags &= ~VXLAN_F_UDP_CSUM;
+               }
 
                memset(&fl4, 0, sizeof(fl4));
                fl4.flowi4_oif = rdst ? rdst->remote_ifindex : 0;
@@ -2102,6 +2104,13 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
                        return;
                }
 
+               if (info) {
+                       if (info->key.tun_flags & TUNNEL_CSUM)
+                               flags &= ~VXLAN_F_UDP_ZERO_CSUM6_TX;
+                       else
+                               flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
+               }
+
                ttl = ttl ? : ip6_dst_hoplimit(ndst);
                err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,
                                      0, ttl, src_port, dst_port, htonl(vni << 8), md,