openvswitch: Add support for checksums on UDP tunnels.

Currently, it isn't possible to request checksums on the outer UDP
header of tunnels - the TUNNEL_CSUM flag is ignored. This adds
support for requesting that UDP checksums be computed on transmit
and properly reported if they are present on receive.

Signed-off-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 10 insertions, 7 deletions

diff --git a/include/net/geneve.h b/include/net/geneve.h
index 03aa2adb5bab..14fb8d3390b4 100644
--- a/include/net/geneve.h
+++ b/include/net/geneve.h
@@ -90,7 +90,7 @@ int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt,
                     struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos,
                     __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port,
                     __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
-                    bool xnet);
+                    bool csum, bool xnet);
 #endif /*ifdef CONFIG_INET */
 
 #endif /*ifdef__NET_GENEVE_H */
diff --git a/net/ipv4/geneve.c b/net/ipv4/geneve.c
index 93e51199e44b..5a4828ba05ad 100644
--- a/net/ipv4/geneve.c
+++ b/net/ipv4/geneve.c
@@ -107,13 +107,13 @@ int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt,
                     struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos,
                     __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port,
                     __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
-                    bool xnet)
+                    bool csum, bool xnet)
 {
         struct genevehdr *gnvh;
         int min_headroom;
         int err;
 
-        skb = udp_tunnel_handle_offloads(skb, !gs->sock->sk->sk_no_check_tx);
+        skb = udp_tunnel_handle_offloads(skb, csum);
         if (IS_ERR(skb))
                 return PTR_ERR(skb);
 
@@ -138,7 +138,7 @@ int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt,
 
         return udp_tunnel_xmit_skb(rt, skb, src, dst,
                                    tos, ttl, df, src_port, dst_port, xnet,
-                                   gs->sock->sk->sk_no_check_tx);
+                                   !csum);
 }
 EXPORT_SYMBOL_GPL(geneve_xmit_skb);
 
diff --git a/net/openvswitch/vport-geneve.c b/net/openvswitch/vport-geneve.c
index 7ca3d454ff3b..bf02fd5808c9 100644
--- a/net/openvswitch/vport-geneve.c
+++ b/net/openvswitch/vport-geneve.c
@@ -212,7 +212,7 @@ static int geneve_tnl_send(struct vport *vport, struct sk_buff *skb)
                               tun_key->ipv4_dst, tun_key->ipv4_tos,
                               tun_key->ipv4_ttl, df, sport, dport,
                               tun_key->tun_flags, vni, opts_len, opts,
-                              false);
+                              !!(tun_key->tun_flags & TUNNEL_CSUM), false);
         if (err < 0)
                 ip_rt_put(rt);
         return err;
diff --git a/net/openvswitch/vport-vxlan.c b/net/openvswitch/vport-vxlan.c
index 3cc983bf444a..ff07d4062d60 100644
--- a/net/openvswitch/vport-vxlan.c
+++ b/net/openvswitch/vport-vxlan.c
@@ -74,7 +74,7 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
         __be64 key;
         __be16 flags;
 
-        flags = TUNNEL_KEY;
+        flags = TUNNEL_KEY | (udp_hdr(skb)->check != 0 ? TUNNEL_CSUM : 0);
         vxlan_port = vxlan_vport(vport);
         if (vxlan_port->exts & VXLAN_F_GBP)
                 flags |= TUNNEL_VXLAN_OPT;
@@ -230,6 +230,7 @@ static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
         __be16 src_port;
         __be16 df;
         int err;
+        u32 vxflags;
 
         if (unlikely(!OVS_CB(skb)->egress_tun_info)) {
                 err = -EINVAL;
@@ -251,11 +252,13 @@ static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
         src_port = udp_flow_src_port(net, skb, 0, 0, true);
         md.vni = htonl(be64_to_cpu(tun_key->tun_id) << 8);
         md.gbp = vxlan_ext_gbp(skb);
+        vxflags = vxlan_port->exts |
+                      (tun_key->tun_flags & TUNNEL_CSUM ? VXLAN_F_UDP_CSUM : 0);
 
         err = vxlan_xmit_skb(rt, skb, fl.saddr, tun_key->ipv4_dst,
                              tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
                              src_port, dst_port,
-                             &md, false, vxlan_port->exts);
+                             &md, false, vxflags);
         if (err < 0)
                 ip_rt_put(rt);
         return err;