datapath: compat: fix udp checksum calculation

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

diff --git a/datapath/linux/compat/udp.c b/datapath/linux/compat/udp.c
index f0362b6..4cd22fa 100644 (file)
--- a/datapath/linux/compat/udp.c
+++ b/datapath/linux/compat/udp.c
@@ -1,6 +1,6 @@
 #include <linux/version.h>
 
-#ifndef HAVE_UDP_SET_CSUM
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
 
 #include <net/udp.h>
 
@@ -26,12 +26,13 @@ void rpl_udp_set_csum(bool nocheck, struct sk_buff *skb,
                skb->csum_offset = offsetof(struct udphdr, check);
                uh->check = ~udp_v4_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_v4_check(len, saddr, daddr, csum);
                if (uh->check == 0)
                        uh->check = CSUM_MANGLED_0;