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.
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
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * from tahoe: in_cksum.c 1.2 86/01/05
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: releng/6.1/sys/arm/include/in_cksum.h 146594 2005-05-24 21:44:34Z cognet $
37 */
38
39 #ifndef _MACHINE_IN_CKSUM_H_
40 #define _MACHINE_IN_CKSUM_H_ 1
41
42 #include <sys/cdefs.h>
43
44 #ifdef _KERNEL
45 u_short in_cksum(struct mbuf *m, int len);
46 u_short in_addword(u_short sum, u_short b);
47 u_short in_pseudo(u_int sum, u_int b, u_int c);
48 u_short in_cksum_skip(struct mbuf *m, int len, int skip);
49 u_int do_cksum(const void *, int);
50 static __inline u_int
51 in_cksum_hdr(const struct ip *ip)
52 {
53 u_int sum = do_cksum(ip, sizeof(struct ip));
54
55 sum = (sum & 0xffff) + (sum >> 16);
56 if (sum > 0xffff)
57 sum -= 0xffff;
58 return (~sum & 0xffff);
59 }
60 #endif /* _KERNEL */
61 #endif /* _MACHINE_IN_CKSUM_H_ */
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