in_cksum.h revision 235941
166458Sdfr/*- 266458Sdfr * Copyright (c) 1990 The Regents of the University of California. 366458Sdfr * All rights reserved. 466458Sdfr * 566458Sdfr * Redistribution and use in source and binary forms, with or without 666458Sdfr * modification, are permitted provided that the following conditions 766458Sdfr * are met: 866458Sdfr * 1. Redistributions of source code must retain the above copyright 966458Sdfr * notice, this list of conditions and the following disclaimer. 1066458Sdfr * 2. Redistributions in binary form must reproduce the above copyright 1166458Sdfr * notice, this list of conditions and the following disclaimer in the 1266458Sdfr * documentation and/or other materials provided with the distribution. 1366458Sdfr * 4. Neither the name of the University nor the names of its contributors 1466458Sdfr * may be used to endorse or promote products derived from this software 1566458Sdfr * without specific prior written permission. 1666458Sdfr * 1766458Sdfr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1866458Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1966458Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2066458Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2166458Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2266458Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2366458Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2466458Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2566458Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2666458Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2766458Sdfr * SUCH DAMAGE. 2866458Sdfr * 2966458Sdfr * from tahoe: in_cksum.c 1.2 86/01/05 3066458Sdfr * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 3166458Sdfr * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp 3266458Sdfr * $FreeBSD: head/sys/ia64/include/in_cksum.h 235941 2012-05-24 22:00:48Z bz $ 3366458Sdfr */ 3466458Sdfr 3566458Sdfr#ifndef _MACHINE_IN_CKSUM_H_ 3666458Sdfr#define _MACHINE_IN_CKSUM_H_ 1 3766458Sdfr 3866458Sdfr#include <sys/cdefs.h> 3966458Sdfr 4066458Sdfr#define in_cksum(m, len) in_cksum_skip(m, len, 0) 4166458Sdfr 42235941Sbz#if defined(IPVERSION) && (IPVERSION == 4) 4366458Sdfr/* 4466458Sdfr * It it useful to have an Internet checksum routine which is inlineable 4566458Sdfr * and optimized specifically for the task of computing IP header checksums 4666458Sdfr * in the normal case (where there are no options and the header length is 4766458Sdfr * therefore always exactly five 32-bit words. 4866458Sdfr */ 49143063Sjoerg#ifdef __CC_SUPPORTS___INLINE 5066458Sdfr 5166458Sdfrstatic __inline void 5266458Sdfrin_cksum_update(struct ip *ip) 5366458Sdfr{ 5466458Sdfr int __tmpsum; 5566458Sdfr __tmpsum = (int)ntohs(ip->ip_sum) + 256; 5666458Sdfr ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); 5766458Sdfr} 5866458Sdfr 5966458Sdfr#else 6066458Sdfr 6166458Sdfr#define in_cksum_update(ip) \ 6266458Sdfr do { \ 6366458Sdfr int __tmpsum; \ 6466458Sdfr __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ 6566458Sdfr ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ 6666458Sdfr } while(0) 6766458Sdfr 6866458Sdfr#endif 69235941Sbz#endif 7066458Sdfr 7166458Sdfr#ifdef _KERNEL 72235941Sbz#if defined(IPVERSION) && (IPVERSION == 4) 7366458Sdfru_int in_cksum_hdr(const struct ip *ip); 74235941Sbz#endif 7566458Sdfru_short in_addword(u_short sum, u_short b); 7666458Sdfru_short in_pseudo(u_int sum, u_int b, u_int c); 7766458Sdfru_short in_cksum_skip(struct mbuf *m, int len, int skip); 7866458Sdfr#endif 7966458Sdfr 8066458Sdfr#endif /* _MACHINE_IN_CKSUM_H_ */ 81