in_cksum.h revision 66458
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 * 3. All advertising materials mentioning features or use of this software 1466458Sdfr * must display the following acknowledgement: 1566458Sdfr * This product includes software developed by the University of 1666458Sdfr * California, Berkeley and its contributors. 1766458Sdfr * 4. Neither the name of the University nor the names of its contributors 1866458Sdfr * may be used to endorse or promote products derived from this software 1966458Sdfr * without specific prior written permission. 2066458Sdfr * 2166458Sdfr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2266458Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2366458Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2466458Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2566458Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2666458Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2766458Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2866458Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2966458Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3066458Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3166458Sdfr * SUCH DAMAGE. 3266458Sdfr * 3366458Sdfr * from tahoe: in_cksum.c 1.2 86/01/05 3466458Sdfr * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 3566458Sdfr * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp 3666458Sdfr * $FreeBSD: head/sys/amd64/include/in_cksum.h 66458 2000-09-29 13:46:07Z dfr $ 3766458Sdfr */ 3866458Sdfr 3966458Sdfr#ifndef _MACHINE_IN_CKSUM_H_ 4066458Sdfr#define _MACHINE_IN_CKSUM_H_ 1 4166458Sdfr 4266458Sdfr#include <sys/cdefs.h> 4366458Sdfr 4466458Sdfr#define in_cksum(m, len) in_cksum_skip(m, len, 0) 4566458Sdfr 4666458Sdfr/* 4766458Sdfr * It it useful to have an Internet checksum routine which is inlineable 4866458Sdfr * and optimized specifically for the task of computing IP header checksums 4966458Sdfr * in the normal case (where there are no options and the header length is 5066458Sdfr * therefore always exactly five 32-bit words. 5166458Sdfr */ 5266458Sdfr#ifdef __GNUC__ 5366458Sdfr 5466458Sdfrstatic __inline void 5566458Sdfrin_cksum_update(struct ip *ip) 5666458Sdfr{ 5766458Sdfr int __tmpsum; 5866458Sdfr __tmpsum = (int)ntohs(ip->ip_sum) + 256; 5966458Sdfr ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); 6066458Sdfr} 6166458Sdfr 6266458Sdfr#else 6366458Sdfr 6466458Sdfr#define in_cksum_update(ip) \ 6566458Sdfr do { \ 6666458Sdfr int __tmpsum; \ 6766458Sdfr __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ 6866458Sdfr ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ 6966458Sdfr } while(0) 7066458Sdfr 7166458Sdfr#endif 7266458Sdfr 7366458Sdfr#ifdef _KERNEL 7466458Sdfru_int in_cksum_hdr(const struct ip *ip); 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