in_cksum.h (cf4e1c4613cfe253ceb3ca9f19809d9e16176458) in_cksum.h (1ebcad572053d01726fbe6c1698f3badd61eaef2)
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

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30 * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91
31 * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
32 * $FreeBSD$
33 */
34
35#ifndef _MACHINE_IN_CKSUM_H_
36#define _MACHINE_IN_CKSUM_H_ 1
37
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

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34 * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91
35 * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
36 * $FreeBSD$
37 */
38
39#ifndef _MACHINE_IN_CKSUM_H_
40#define _MACHINE_IN_CKSUM_H_ 1
41
38#ifndef _SYS_CDEFS_H_
39#error this file needs sys/cdefs.h as a prerequisite
40#endif
41
42#include <sys/cdefs.h>
43
44#define in_cksum(m, len) in_cksum_skip(m, len, 0)
45
46/*
47 * It it useful to have an Internet checksum routine which is inlineable
48 * and optimized specifically for the task of computing IP header checksums
49 * in the normal case (where there are no options and the header length is
50 * therefore always exactly five 32-bit words.
51 */
42#include <sys/cdefs.h>
43
44#define in_cksum(m, len) in_cksum_skip(m, len, 0)
45
46/*
47 * It it useful to have an Internet checksum routine which is inlineable
48 * and optimized specifically for the task of computing IP header checksums
49 * in the normal case (where there are no options and the header length is
50 * therefore always exactly five 32-bit words.
51 */
52#ifdef __CC_SUPPORTS___INLINE
52#ifdef __GNUC__
53
54static __inline void
55in_cksum_update(struct ip *ip)
56{
57 int __tmpsum;
58 __tmpsum = (int)ntohs(ip->ip_sum) + 256;
59 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
60}

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54static __inline void
55in_cksum_update(struct ip *ip)
56{
57 int __tmpsum;
58 __tmpsum = (int)ntohs(ip->ip_sum) + 256;
59 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
60}

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