/*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from tahoe: in_cksum.c 1.2 86/01/05 * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp * $FreeBSD$ */ #ifndef _MACHINE_IN_CKSUM_H_ #define _MACHINE_IN_CKSUM_H_ 1 #include /* * It it useful to have an Internet checksum routine which is inlineable * and optimized specifically for the task of computing IP header checksums * in the normal case (where there are no options and the header length is * therefore always exactly five 32-bit words. */ #ifdef __GNUC__ static __inline void in_cksum_update(struct ip *ip) { int __tmpsum; __tmpsum = (int)ntohs(ip->ip_sum) + 256; ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); } #else #define in_cksum_update(ip) \ do { \ int __tmpsum; \ __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ } while(0) #endif typedef unsigned in_psum_t; #ifdef _KERNEL u_int in_cksum_hdr(const struct ip *ip); in_psum_t in_cksum_partial(in_psum_t psum, const u_short *w, int len); int in_cksum_finalize(in_psum_t psum); u_short in_addword(u_short sum, u_short b); u_short in_pseudo(u_int sum, u_int b, u_int c); u_short in_cksum_skip(struct mbuf *m, int len, int skip); #endif #endif /* _MACHINE_IN_CKSUM_H_ */