datapath: compat: fix udp checksum calculation

[cascardo/ovs.git] / datapath / linux / compat / udp_tunnel.c

diff --git a/datapath/linux/compat/udp_tunnel.c b/datapath/linux/compat/udp_tunnel.c
index 9265c8a..9cf7286 100644 (file)
--- a/datapath/linux/compat/udp_tunnel.c
+++ b/datapath/linux/compat/udp_tunnel.c
@@ -203,12 +203,13 @@ static void udp6_set_csum(bool nocheck, struct sk_buff *skb,
                skb->csum_offset = offsetof(struct udphdr, check);
                uh->check = ~udp_v6_check(len, saddr, daddr, 0);
        } else {
+               int l4_offset = skb_transport_offset(skb);
                __wsum csum;
 
                BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
 
                uh->check = 0;
-               csum = skb_checksum(skb, 0, len, 0);
+               csum = skb_checksum(skb, l4_offset, len, 0);
                uh->check = udp_v6_check(len, saddr, daddr, csum);
                if (uh->check == 0)
                        uh->check = CSUM_MANGLED_0;