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 * from: src/sys/alpha/include/in_cksum.h,v 1.7 2005/03/02 21:33:20 joerg
35 * $FreeBSD$
36 */
37
38 #ifndef _MACHINE_IN_CKSUM_H_
39 #define _MACHINE_IN_CKSUM_H_ 1
40
41 #include <sys/cdefs.h>
42
43 #define in_cksum(m, len) in_cksum_skip(m, len, 0)
44
45 #if defined(IPVERSION) && (IPVERSION == 4)
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
53
54 static __inline void
in_cksum_update(struct ip * ip)55 in_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 }
61
62 #else
63
64 #define in_cksum_update(ip) \
65 do { \
66 int __tmpsum; \
67 __tmpsum = (int)ntohs(ip->ip_sum) + 256; \
68 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \
69 } while(0)
70
71 #endif
72 #endif
73
74 #ifdef _KERNEL
75 #if defined(IPVERSION) && (IPVERSION == 4)
76 u_int in_cksum_hdr(const struct ip *ip);
77 #endif
78 u_short in_addword(u_short sum, u_short b);
79 u_short in_pseudo(u_int sum, u_int b, u_int c);
80 u_short in_cksum_skip(struct mbuf *m, int len, int skip);
81 #endif
82
83 #endif /* _MACHINE_IN_CKSUM_H_ */
84