[src/trunk]: src/sys/netinet Don't compute psuedo header checksum if nxt == 0.

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

details:   https://anonhg.NetBSD.org/src/rev/35c08f784e60
branches:  trunk
changeset: 510091:35c08f784e60
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Sat May 19 00:13:53 2001 +0000

description:
Don't compute psuedo header checksum if nxt == 0.

diffstat:

 sys/netinet/in4_cksum.c |  32 +++++++++++++++++---------------
 1 files changed, 17 insertions(+), 15 deletions(-)

diffs (46 lines):

diff -r 38e91b4b3aef -r 35c08f784e60 sys/netinet/in4_cksum.c
--- a/sys/netinet/in4_cksum.c   Sat May 19 00:04:56 2001 +0000
+++ b/sys/netinet/in4_cksum.c   Sat May 19 00:13:53 2001 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: in4_cksum.c,v 1.4 2000/03/30 13:24:55 augustss Exp $   */
+/*     $NetBSD: in4_cksum.c,v 1.5 2001/05/19 00:13:53 thorpej Exp $    */
 
 /*
  * Copyright (C) 1999 WIDE Project.
@@ -109,20 +109,22 @@
                u_int32_t l;
        } l_util;
 
-       /* pseudo header */
-       if (off < sizeof(struct ipovly))
-               panic("in4_cksum: offset too short");
-       if (m->m_len < sizeof(struct ip))
-               panic("in4_cksum: bad mbuf chain");
-       bzero(&ipov, sizeof(ipov));
-       ipov.ih_len = htons(len);
-       ipov.ih_pr = nxt;
-       ipov.ih_src = mtod(m, struct ip *)->ip_src;
-       ipov.ih_dst = mtod(m, struct ip *)->ip_dst;
-       w = (u_int16_t *)&ipov;
-       /* assumes sizeof(ipov) == 20 */
-       sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3]; sum += w[4];
-       sum += w[5]; sum += w[6]; sum += w[7]; sum += w[8]; sum += w[9];
+       if (nxt == 0) {
+               /* pseudo header */
+               if (off < sizeof(struct ipovly))
+                       panic("in4_cksum: offset too short");
+               if (m->m_len < sizeof(struct ip))
+                       panic("in4_cksum: bad mbuf chain");
+               bzero(&ipov, sizeof(ipov));
+               ipov.ih_len = htons(len);
+               ipov.ih_pr = nxt;
+               ipov.ih_src = mtod(m, struct ip *)->ip_src;
+               ipov.ih_dst = mtod(m, struct ip *)->ip_dst;
+               w = (u_int16_t *)&ipov;
+               /* assumes sizeof(ipov) == 20 */
+               sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3]; sum += w[4];
+               sum += w[5]; sum += w[6]; sum += w[7]; sum += w[8]; sum += w[9];
+       }
 
        /* skip unnecessary part */
        while (m && off > 0) {