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

This commit is contained in:
thorpej 2001-05-19 00:30:35 +00:00
parent 905e7935a9
commit 1af4d30054
1 changed files with 15 additions and 13 deletions
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28
sys/arch/alpha/alpha/in_cksum.c
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@ -1,4 +1,4 @@
/* $NetBSD: in_cksum.c,v 1.9 2001/04/29 05:54:29 thorpej Exp $ */
/* $NetBSD: in_cksum.c,v 1.10 2001/05/19 00:30:35 thorpej Exp $ */
/*
* Copyright (c) 1988, 1992, 1993
@ -39,7 +39,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: in_cksum.c,v 1.9 2001/04/29 05:54:29 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: in_cksum.c,v 1.10 2001/05/19 00:30:35 thorpej Exp $");
#include <sys/param.h>
#include <sys/mbuf.h>
@ -211,20 +211,22 @@ in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len)
union l_util l_util;
struct ipovly ipov;
/* 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");
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");
memset(&ipov, 0, sizeof(ipov));
memset(&ipov, 0, 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;
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;
sum += in_cksumdata((caddr_t) &ipov, sizeof(ipov));
sum += in_cksumdata((caddr_t) &ipov, sizeof(ipov));
}
/* skip over unnecessary part */
while (m != NULL && off > 0) {