1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * from tahoe: in_cksum.c 1.2 86/01/05 32 * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 33 * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp 34 * $FreeBSD$ 35 */ 36 37 #ifndef _MACHINE_IN_CKSUM_H_ 38 #define _MACHINE_IN_CKSUM_H_ 1 39 40 #ifndef _SYS_CDEFS_H_ 41 #error this file needs sys/cdefs.h as a prerequisite 42 #endif 43 44 #include <sys/cdefs.h> 45 46 #define in_cksum(m, len) in_cksum_skip(m, len, 0) 47 48 #if defined(IPVERSION) && (IPVERSION == 4) 49 /* 50 * It it useful to have an Internet checksum routine which is inlineable 51 * and optimized specifically for the task of computing IP header checksums 52 * in the normal case (where there are no options and the header length is 53 * therefore always exactly five 32-bit words. 54 */ 55 #ifdef __CC_SUPPORTS___INLINE 56 57 static __inline void 58 in_cksum_update(struct ip *ip) 59 { 60 int __tmpsum; 61 __tmpsum = (int)ntohs(ip->ip_sum) + 256; 62 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); 63 } 64 65 #else 66 67 #define in_cksum_update(ip) \ 68 do { \ 69 int __tmpsum; \ 70 __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ 71 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ 72 } while(0) 73 74 #endif 75 #endif 76 77 #ifdef _KERNEL 78 #if defined(IPVERSION) && (IPVERSION == 4) 79 u_int in_cksum_hdr(const struct ip *ip); 80 #endif 81 u_short in_addword(u_short sum, u_short b); 82 u_short in_pseudo(u_int sum, u_int b, u_int c); 83 u_short in_cksum_skip(struct mbuf *m, int len, int skip); 84 #endif 85 86 #endif /* _MACHINE_IN_CKSUM_H_ */ 87