From fc1211a6abd377660b11181cd45ea0ff3f4fd136 Mon Sep 17 00:00:00 2001
From: mycroft <mycroft@NetBSD.org>
Date: Tue, 19 Jan 1999 21:58:40 +0000
Subject: [PATCH] Don't overwrite the checksum fields when checking them. 
 There's no reason to do this, and it screws up ICMP replies. XXX The returned
 IP checksum and length are still wrong.

---
 sys/netinet/ip_input.c   | 4 ++--
 sys/netinet/tcp_input.c  | 4 ++--
 sys/netinet/udp_usrreq.c | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/sys/netinet/ip_input.c b/sys/netinet/ip_input.c
index 088ac419d864..821433e3a397 100644
--- a/sys/netinet/ip_input.c
+++ b/sys/netinet/ip_input.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ip_input.c,v 1.77 1999/01/11 22:35:06 thorpej Exp $	*/
+/*	$NetBSD: ip_input.c,v 1.78 1999/01/19 21:58:40 mycroft Exp $	*/
 
 /*-
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
@@ -340,7 +340,7 @@ next:
 		}
 		ip = mtod(m, struct ip *);
 	}
-	if ((ip->ip_sum = in_cksum(m, hlen)) != 0) {
+	if (in_cksum(m, hlen) != 0) {
 		ipstat.ips_badsum++;
 		goto bad;
 	}
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
index db659e082ae5..d2b6e7454934 100644
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: tcp_input.c,v 1.72 1998/12/18 21:38:02 thorpej Exp $	*/
+/*	$NetBSD: tcp_input.c,v 1.73 1999/01/19 21:58:41 mycroft Exp $	*/
 
 /*-
  * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@@ -486,7 +486,7 @@ tcp_input(m, va_alist)
 	bzero(ti->ti_x1, sizeof ti->ti_x1);
 	ti->ti_len = (u_int16_t)tlen;
 	HTONS(ti->ti_len);
-	if ((ti->ti_sum = in_cksum(m, len)) != 0) {
+	if (in_cksum(m, len) != 0) {
 		tcpstat.tcps_rcvbadsum++;
 		goto drop;
 	}
diff --git a/sys/netinet/udp_usrreq.c b/sys/netinet/udp_usrreq.c
index 398bdda98a77..be324d1cf2a6 100644
--- a/sys/netinet/udp_usrreq.c
+++ b/sys/netinet/udp_usrreq.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: udp_usrreq.c,v 1.45 1999/01/11 22:35:07 thorpej Exp $	*/
+/*	$NetBSD: udp_usrreq.c,v 1.46 1999/01/19 21:58:41 mycroft Exp $	*/
 
 /*
  * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
@@ -164,7 +164,7 @@ udp_input(m, va_alist)
 		bzero(((struct ipovly *)ip)->ih_x1,
 		    sizeof ((struct ipovly *)ip)->ih_x1);
 		((struct ipovly *)ip)->ih_len = uh->uh_ulen;
-		if ((uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) != 0) {
+		if (in_cksum(m, len + sizeof (struct ip)) != 0) {
 			udpstat.udps_badsum++;
 			m_freem(m);
 			return;