114d617bfSBenno Rice /*- 214d617bfSBenno Rice * Copyright (c) 1990 The Regents of the University of California. 314d617bfSBenno Rice * All rights reserved. 414d617bfSBenno Rice * 514d617bfSBenno Rice * Redistribution and use in source and binary forms, with or without 614d617bfSBenno Rice * modification, are permitted provided that the following conditions 714d617bfSBenno Rice * are met: 814d617bfSBenno Rice * 1. Redistributions of source code must retain the above copyright 914d617bfSBenno Rice * notice, this list of conditions and the following disclaimer. 1014d617bfSBenno Rice * 2. Redistributions in binary form must reproduce the above copyright 1114d617bfSBenno Rice * notice, this list of conditions and the following disclaimer in the 1214d617bfSBenno Rice * documentation and/or other materials provided with the distribution. 1314d617bfSBenno Rice * 3. All advertising materials mentioning features or use of this software 1414d617bfSBenno Rice * must display the following acknowledgement: 1514d617bfSBenno Rice * This product includes software developed by the University of 1614d617bfSBenno Rice * California, Berkeley and its contributors. 1714d617bfSBenno Rice * 4. Neither the name of the University nor the names of its contributors 1814d617bfSBenno Rice * may be used to endorse or promote products derived from this software 1914d617bfSBenno Rice * without specific prior written permission. 2014d617bfSBenno Rice * 2114d617bfSBenno Rice * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2214d617bfSBenno Rice * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2314d617bfSBenno Rice * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2414d617bfSBenno Rice * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2514d617bfSBenno Rice * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2614d617bfSBenno Rice * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2714d617bfSBenno Rice * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2814d617bfSBenno Rice * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2914d617bfSBenno Rice * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3014d617bfSBenno Rice * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3114d617bfSBenno Rice * SUCH DAMAGE. 3214d617bfSBenno Rice * 3314d617bfSBenno Rice * from tahoe: in_cksum.c 1.2 86/01/05 3414d617bfSBenno Rice * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 3514d617bfSBenno Rice * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp 3614d617bfSBenno Rice * $FreeBSD$ 3714d617bfSBenno Rice */ 3814d617bfSBenno Rice 3914d617bfSBenno Rice #ifndef _MACHINE_IN_CKSUM_H_ 4014d617bfSBenno Rice #define _MACHINE_IN_CKSUM_H_ 1 4114d617bfSBenno Rice 4214d617bfSBenno Rice #include <sys/cdefs.h> 4314d617bfSBenno Rice 4414d617bfSBenno Rice #define in_cksum(m, len) in_cksum_skip(m, len, 0) 4514d617bfSBenno Rice 4614d617bfSBenno Rice /* 4714d617bfSBenno Rice * It it useful to have an Internet checksum routine which is inlineable 4814d617bfSBenno Rice * and optimized specifically for the task of computing IP header checksums 4914d617bfSBenno Rice * in the normal case (where there are no options and the header length is 5014d617bfSBenno Rice * therefore always exactly five 32-bit words. 5114d617bfSBenno Rice */ 5214d617bfSBenno Rice #ifdef __GNUC__ 5314d617bfSBenno Rice 5414d617bfSBenno Rice static __inline void 5514d617bfSBenno Rice in_cksum_update(struct ip *ip) 5614d617bfSBenno Rice { 5714d617bfSBenno Rice int __tmpsum; 5814d617bfSBenno Rice __tmpsum = (int)ntohs(ip->ip_sum) + 256; 5914d617bfSBenno Rice ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); 6014d617bfSBenno Rice } 6114d617bfSBenno Rice 6214d617bfSBenno Rice #else 6314d617bfSBenno Rice 6414d617bfSBenno Rice #define in_cksum_update(ip) \ 6514d617bfSBenno Rice do { \ 6614d617bfSBenno Rice int __tmpsum; \ 6714d617bfSBenno Rice __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ 6814d617bfSBenno Rice ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ 6914d617bfSBenno Rice } while(0) 7014d617bfSBenno Rice 7114d617bfSBenno Rice #endif 7214d617bfSBenno Rice 7314d617bfSBenno Rice #ifdef _KERNEL 7414d617bfSBenno Rice u_int in_cksum_hdr(const struct ip *ip); 7514d617bfSBenno Rice u_short in_addword(u_short sum, u_short b); 7614d617bfSBenno Rice u_short in_pseudo(u_int sum, u_int b, u_int c); 7714d617bfSBenno Rice u_short in_cksum_skip(struct mbuf *m, int len, int skip); 7814d617bfSBenno Rice #endif 7914d617bfSBenno Rice 8014d617bfSBenno Rice #endif /* _MACHINE_IN_CKSUM_H_ */ 81