From 5cff1e9eb1c38a73f07d97870c11d771f906abc6 Mon Sep 17 00:00:00 2001
From: angelos <angelos@openbsd.org>
Date: Wed, 12 Apr 2000 18:05:47 +0000
Subject: [PATCH] Fix checksum for outgoing etherip/ipip packets from enc
 interfaces.

---
 sys/net/if_enc.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/sys/net/if_enc.c b/sys/net/if_enc.c
index 9f7edda7e57..329a342d690 100644
--- a/sys/net/if_enc.c
+++ b/sys/net/if_enc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_enc.c,v 1.27 2000/04/10 07:34:53 angelos Exp $	*/
+/*	$OpenBSD: if_enc.c,v 1.28 2000/04/12 18:05:47 angelos Exp $	*/
 
 /*
  * The authors of this code are John Ioannidis (ji@tla.org),
@@ -261,6 +261,17 @@ struct ifnet *ifp;
 	    mp = NULL;
 	}
 
+#ifdef INET
+	/* Fix header checksum for IPv4 */
+        if (tdb->tdb_dst.sa.sa_family == AF_INET)
+	{
+	    struct ip *ip;
+
+	    ip = mtod(m, struct ip *);
+	    ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
+        }
+#endif
+
 	protoflag = tdb->tdb_dst.sa.sa_family;
 
 	/* IPsec packet processing -- skip encapsulation */
-- 
2.20.1