43509a120f
The eigrpd daemon will support the Enhanced Interior Gateway Routing Protocol. Built using the imsg/three process framework and heavily based on ospfd(8), ospf6d(8) and ldpd(8). The current status of eigrpd(8) is as follows: * Almost full compliance with the specification: DUAL FSM, RTP, CR mode, SIA, etc * Support for both IPv4 and IPv6 * Support for multiple instances (different ASes/AFs) within the same process * Support for rdomains (one process per rdomain) * RIB/FIB synchronization * Basic redistribution support Not implemented features (yet): * Configuration reload support (partially implemented) * Route summarization * Advanced route redistribution/filtering * Carp integration * Authentication (draft is missing information) * Stub (not released by Cisco) Not yet connected to the builds. ok deraadt@ claudio@
83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
/* $OpenBSD: in_cksum.c,v 1.1 2015/10/02 04:26:47 renato Exp $ */
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/* $NetBSD: in_cksum.c,v 1.3 1995/04/22 13:53:48 cgd Exp $ */
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/*
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* Copyright (c) 1992 Regents of the University of California.
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* All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) Header: in_cksum.c,v 1.1 92/09/11 01:15:55 leres Exp (LBL)
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*/
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#include <sys/types.h>
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#include "eigrpd.h"
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#include "log.h"
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/*
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* Checksum routine for Internet Protocol family headers.
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* This routine is very heavily used in the network
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* code and should be modified for each CPU to be as fast as possible.
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* In particular, it should not be this one.
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*/
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uint16_t
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in_cksum(void *p, size_t l)
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{
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unsigned int sum = 0;
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int len;
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unsigned char *cp = p;
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/* ensure that < 2^16 bytes being summed */
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if (l >= (1 << 16))
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fatalx("in_cksum: packet too big");
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len = (int)l;
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if (((long)cp & 1) == 0) {
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while (len > 1) {
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sum += htons(*(unsigned short *)cp);
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cp += 2;
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len -= 2;
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}
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} else {
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while (len > 1) {
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sum += *cp++ << 8;
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sum += *cp++;
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len -= 2;
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}
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}
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if (len == 1)
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sum += *cp << 8;
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sum = (sum >> 16) + (sum & 0xffff); /* add in accumulated carries */
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sum += sum >> 16; /* add potential last carry */
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sum = ntohs(sum);
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return (0xffff & ~sum);
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}
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