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From: Pavlin Radoslavov <pavlin@icir.org>
Message-Id: <200303130914.h2D9EMep083746@xorpc.icir.org>
Date: Thu, 13 Mar 2003 1:14:22 ()
To: xorp-cvs@icir.org
Reply-To: pavlin@icir.org
Subject: [Xorp-cvs] XORP cvs commit: xorp/mrt/ inet_cksum.c
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CVSROOT: /usr/local/share/doc/apache/cvs
Module name: xorp
Repository: xorp/mrt/
Changes by: pavlin@xorpc.icir.org. 03/03/13 01:14:22
Modified files:
xorp/mrt/: inet_cksum.c
Log message:
Bugfix in inet_cksum_add() in computing the result IP checksum
when the packet is split into two parts, and we know the checksum
of each part. The solution is rather simple (the very first line
is the key, the rest is same as in traditional inet_cksum():
int sum = (uint16_t)~sum1 + (uint16_t)~sum2;
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
uint16_t answer = ~sum;
return (answer);
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