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Modify the checksum slightly so that the htons()s can all be combined.

This commit is contained in:
mycroft 1999-01-24 12:57:38 +00:00
parent 3e6e3322d8
commit 94895652e1
1 changed files with 3 additions and 4 deletions
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7
sys/netinet/ip_flow.c
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@ -1,4 +1,4 @@
/* $NetBSD: ip_flow.c,v 1.7 1998/10/08 01:41:45 thorpej Exp $ */
/* $NetBSD: ip_flow.c,v 1.8 1999/01/24 12:57:38 mycroft Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -198,11 +198,10 @@ ipflow_fastforward(
* 16 bits and a carry).
*/
ip->ip_ttl -= IPTTLDEC;
if (ip->ip_sum >= htons(0xffff - (IPTTLDEC << 8))) {
if (ip->ip_sum >= 0xffff - htons(IPTTLDEC << 8))
ip->ip_sum += htons(IPTTLDEC << 8) + 1;
} else {
else
ip->ip_sum += htons(IPTTLDEC << 8);
}
/*
* Trim the packet in case it's too long..