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 * 4. Neither the name of the University nor the names of its contributors 1414d617bfSBenno Rice * may be used to endorse or promote products derived from this software 1514d617bfSBenno Rice * without specific prior written permission. 1614d617bfSBenno Rice * 1714d617bfSBenno Rice * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1814d617bfSBenno Rice * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1914d617bfSBenno Rice * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2014d617bfSBenno Rice * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2114d617bfSBenno Rice * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2214d617bfSBenno Rice * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2314d617bfSBenno Rice * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2414d617bfSBenno Rice * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2514d617bfSBenno Rice * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2614d617bfSBenno Rice * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2714d617bfSBenno Rice * SUCH DAMAGE. 2814d617bfSBenno Rice * 2914d617bfSBenno Rice * from tahoe: in_cksum.c 1.2 86/01/05 3014d617bfSBenno Rice * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 3114d617bfSBenno Rice * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp 3214d617bfSBenno Rice * $FreeBSD$ 3314d617bfSBenno Rice */ 3414d617bfSBenno Rice 3514d617bfSBenno Rice #ifndef _MACHINE_IN_CKSUM_H_ 3614d617bfSBenno Rice #define _MACHINE_IN_CKSUM_H_ 1 3714d617bfSBenno Rice 3814d617bfSBenno Rice #include <sys/cdefs.h> 3914d617bfSBenno Rice 4014d617bfSBenno Rice #define in_cksum(m, len) in_cksum_skip(m, len, 0) 4114d617bfSBenno Rice 42*920b9658SBjoern A. Zeeb #if defined(IPVERSION) && (IPVERSION == 4) 4314d617bfSBenno Rice /* 4414d617bfSBenno Rice * It it useful to have an Internet checksum routine which is inlineable 4514d617bfSBenno Rice * and optimized specifically for the task of computing IP header checksums 4614d617bfSBenno Rice * in the normal case (where there are no options and the header length is 4714d617bfSBenno Rice * therefore always exactly five 32-bit words. 4814d617bfSBenno Rice */ 49a5f50ef9SJoerg Wunsch #ifdef __CC_SUPPORTS___INLINE 5014d617bfSBenno Rice 5114d617bfSBenno Rice static __inline void 5214d617bfSBenno Rice in_cksum_update(struct ip *ip) 5314d617bfSBenno Rice { 5414d617bfSBenno Rice int __tmpsum; 5514d617bfSBenno Rice __tmpsum = (int)ntohs(ip->ip_sum) + 256; 5614d617bfSBenno Rice ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); 5714d617bfSBenno Rice } 5814d617bfSBenno Rice 5914d617bfSBenno Rice #else 6014d617bfSBenno Rice 6114d617bfSBenno Rice #define in_cksum_update(ip) \ 6214d617bfSBenno Rice do { \ 6314d617bfSBenno Rice int __tmpsum; \ 6414d617bfSBenno Rice __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ 6514d617bfSBenno Rice ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ 6614d617bfSBenno Rice } while(0) 6714d617bfSBenno Rice 6814d617bfSBenno Rice #endif 69*920b9658SBjoern A. Zeeb #endif 7014d617bfSBenno Rice 7114d617bfSBenno Rice #ifdef _KERNEL 72*920b9658SBjoern A. Zeeb #if defined(IPVERSION) && (IPVERSION == 4) 7314d617bfSBenno Rice u_int in_cksum_hdr(const struct ip *ip); 74*920b9658SBjoern A. Zeeb #endif 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