1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * from tahoe: in_cksum.c 1.2 86/01/05 30 * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 31 * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp 32 * from: src/sys/alpha/include/in_cksum.h,v 1.7 2005/03/02 21:33:20 joerg 33 * $FreeBSD: releng/10.2/sys/mips/include/in_cksum.h 235941 2012-05-24 22:00:48Z bz $ 34 */ 35 36#ifndef _MACHINE_IN_CKSUM_H_ 37#define _MACHINE_IN_CKSUM_H_ 1 38 39#include <sys/cdefs.h> 40 41#define in_cksum(m, len) in_cksum_skip(m, len, 0) 42 43#if defined(IPVERSION) && (IPVERSION == 4) 44/* 45 * It it useful to have an Internet checksum routine which is inlineable 46 * and optimized specifically for the task of computing IP header checksums 47 * in the normal case (where there are no options and the header length is 48 * therefore always exactly five 32-bit words. 49 */ 50#ifdef __CC_SUPPORTS___INLINE 51 52static __inline void 53in_cksum_update(struct ip *ip) 54{ 55 int __tmpsum; 56 __tmpsum = (int)ntohs(ip->ip_sum) + 256; 57 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); 58} 59 60#else 61 62#define in_cksum_update(ip) \ 63 do { \ 64 int __tmpsum; \ 65 __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ 66 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ 67 } while(0) 68 69#endif 70#endif 71 72#ifdef _KERNEL 73#if defined(IPVERSION) && (IPVERSION == 4) 74u_int in_cksum_hdr(const struct ip *ip); 75#endif 76u_short in_addword(u_short sum, u_short b); 77u_short in_pseudo(u_int sum, u_int b, u_int c); 78u_short in_cksum_skip(struct mbuf *m, int len, int skip); 79#endif 80 81#endif /* _MACHINE_IN_CKSUM_H_ */ 82