[src/trunk]: src/sys/netinet correct bad ip checksum on multicast loopback pa...

[itojun <itojun%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f45771d4c4eb
branches:  trunk
changeset: 521464:f45771d4c4eb
user:      itojun <itojun%NetBSD.org@localhost>
date:      Thu Jan 31 07:45:22 2002 +0000

description:
correct bad ip checksum on multicast loopback packet.  PR14597

diffstat:

 sys/netinet/ip_output.c |  11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diffs (32 lines):

diff -r d8dbf404dfcf -r f45771d4c4eb sys/netinet/ip_output.c
--- a/sys/netinet/ip_output.c   Thu Jan 31 07:05:43 2002 +0000
+++ b/sys/netinet/ip_output.c   Thu Jan 31 07:45:22 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ip_output.c,v 1.92 2002/01/22 03:53:55 itojun Exp $    */
+/*     $NetBSD: ip_output.c,v 1.93 2002/01/31 07:45:22 itojun Exp $    */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -102,7 +102,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ip_output.c,v 1.92 2002/01/22 03:53:55 itojun Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ip_output.c,v 1.93 2002/01/31 07:45:22 itojun Exp $");
 
 #include "opt_pfil_hooks.h"
 #include "opt_ipsec.h"
@@ -1643,6 +1643,13 @@
                ip = mtod(copym, struct ip *);
                HTONS(ip->ip_len);
                HTONS(ip->ip_off);
+
+               if (copym->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) {
+                       in_delayed_cksum(m);
+                       copym->m_pkthdr.csum_flags &=
+                           ~(M_CSUM_TCPv4|M_CSUM_UDPv4);
+               }
+
                ip->ip_sum = 0;
                ip->ip_sum = in_cksum(copym, ip->ip_hl << 2);
                (void) looutput(ifp, copym, sintosa(dst), NULL);