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 #include <sys/cdefs.h> 41 42 #define in_cksum(m, len) in_cksum_skip(m, len, 0) 43 44 #if defined(IPVERSION) && (IPVERSION == 4) 45 /* 46 * It it useful to have an Internet checksum routine which is inlineable 47 * and optimized specifically for the task of computing IP header checksums 48 * in the normal case (where there are no options and the header length is 49 * therefore always exactly five 32-bit words. 50 */ 51 #ifdef __CC_SUPPORTS___INLINE 52 53 static __inline void 54 in_cksum_update(struct ip *ip) 55 { 56 int __tmpsum; 57 __tmpsum = (int)ntohs(ip->ip_sum) + 256; 58 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); 59 } 60 61 #else 62 63 #define in_cksum_update(ip) \ 64 do { \ 65 int __tmpsum; \ 66 __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ 67 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ 68 } while(0) 69 70 #endif 71 #endif 72 73 #ifdef _KERNEL 74 #if defined(IPVERSION) && (IPVERSION == 4) 75 u_int in_cksum_hdr(const struct ip *ip); 76 #endif 77 u_short in_addword(u_short sum, u_short b); 78 u_short in_pseudo(u_int sum, u_int b, u_int c); 79 u_short in_cksum_skip(struct mbuf *m, int len, int skip); 80 #endif 81 82 #endif /* _MACHINE_IN_CKSUM_H_ */ 83