From beada8408acac72b6aaa976abb7e094192360cf7 Mon Sep 17 00:00:00 2001
From: Nico Schottelius <nico@nico-notebook.schottelius.org>
Date: Tue, 16 Jul 2019 10:55:17 +0200
Subject: [PATCH] udp translation adopted

---
 p4src/actions_delta_checksum.p4 | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/p4src/actions_delta_checksum.p4 b/p4src/actions_delta_checksum.p4
index 1bce770..0a48541 100644
--- a/p4src/actions_delta_checksum.p4
+++ b/p4src/actions_delta_checksum.p4
@@ -70,8 +70,11 @@ action delta_prepare()
 
 action delta_udp_from_v4_to_v6()
 {
-    delta_prepare();
-    hdr.udp.checksum = hdr.udp.checksum + meta.headerdiff;
+    v4sum();
+    v6sum();
+
+    /* here is also a possible overflow in both directions */
+    hdr.udp.checksum = hdr.udp.checksum + meta.v6sum - meta.v4sum;
 }
 
 action delta_tcp_from_v4_to_v6()