in_cksum.h revision 143063
12116Sjkh/*- 22116Sjkh * Copyright (c) 1990 The Regents of the University of California. 3152870Sbde * All rights reserved. 42116Sjkh * 52116Sjkh * Redistribution and use in source and binary forms, with or without 62116Sjkh * modification, are permitted provided that the following conditions 72116Sjkh * are met: 8129981Sdas * 1. Redistributions of source code must retain the above copyright 92116Sjkh * notice, this list of conditions and the following disclaimer. 102116Sjkh * 2. Redistributions in binary form must reproduce the above copyright 118870Srgrimes * notice, this list of conditions and the following disclaimer in the 122116Sjkh * documentation and/or other materials provided with the distribution. 132116Sjkh * 4. Neither the name of the University nor the names of its contributors 142116Sjkh * may be used to endorse or promote products derived from this software 152116Sjkh * without specific prior written permission. 16152870Sbde * 17176451Sdas * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18176451Sdas * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 192116Sjkh * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 202116Sjkh * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 212116Sjkh * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 222116Sjkh * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23152343Sbde * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24152741Sbde * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25152713Sbde * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 262116Sjkh * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27152741Sbde * SUCH DAMAGE. 28152741Sbde * 29152741Sbde * from tahoe: in_cksum.c 1.2 86/01/05 30152741Sbde * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 31152741Sbde * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp 32152741Sbde * $FreeBSD: head/sys/amd64/include/in_cksum.h 143063 2005-03-02 21:33:29Z joerg $ 332116Sjkh */ 342116Sjkh 35239192Sdim#ifndef _MACHINE_IN_CKSUM_H_ 36239192Sdim#define _MACHINE_IN_CKSUM_H_ 1 37152647Sbde 38239192Sdim#include <sys/cdefs.h> 39152713Sbde 402116Sjkh#define in_cksum(m, len) in_cksum_skip(m, len, 0) 41152881Sbde 42152343Sbde/* 432116Sjkh * It it useful to have an Internet checksum routine which is inlineable 44152881Sbde * and optimized specifically for the task of computing IP header checksums 45152881Sbde * in the normal case (where there are no options and the header length is 46152881Sbde * therefore always exactly five 32-bit words. 47152881Sbde */ 48152881Sbde#ifdef __CC_SUPPORTS___INLINE 49152881Sbde 50152881Sbdestatic __inline void 51152881Sbdein_cksum_update(struct ip *ip) 52152881Sbde{ 53152881Sbde int __tmpsum; 54152881Sbde __tmpsum = (int)ntohs(ip->ip_sum) + 256; 55152881Sbde ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); 56152881Sbde} 57152881Sbde 58152881Sbde#else 59152881Sbde 60152881Sbde#define in_cksum_update(ip) \ 612116Sjkh do { \ 62152881Sbde int __tmpsum; \ 63152881Sbde __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ 64152766Sbde ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ 65152766Sbde } while(0) 662116Sjkh 67#endif 68 69#ifdef _KERNEL 70u_int in_cksum_hdr(const struct ip *ip); 71u_short in_addword(u_short sum, u_short b); 72u_short in_pseudo(u_int sum, u_int b, u_int c); 73u_short in_cksum_skip(struct mbuf *m, int len, int skip); 74#endif 75 76#endif /* _MACHINE_IN_CKSUM_H_ */ 77