b49b7fe799
license, per letter dated July 22, 1999 and email from Peter Wemm, Alan Cox and Robert Watson. Approved by: core, peter, alc, rwatson
77 lines
2.7 KiB
C
77 lines
2.7 KiB
C
/*-
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from tahoe: in_cksum.c 1.2 86/01/05
|
|
* from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91
|
|
* from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_IN_CKSUM_H_
|
|
#define _MACHINE_IN_CKSUM_H_ 1
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
#define in_cksum(m, len) in_cksum_skip(m, len, 0)
|
|
|
|
/*
|
|
* It it useful to have an Internet checksum routine which is inlineable
|
|
* and optimized specifically for the task of computing IP header checksums
|
|
* in the normal case (where there are no options and the header length is
|
|
* therefore always exactly five 32-bit words.
|
|
*/
|
|
#ifdef __GNUC__
|
|
|
|
static __inline void
|
|
in_cksum_update(struct ip *ip)
|
|
{
|
|
int __tmpsum;
|
|
__tmpsum = (int)ntohs(ip->ip_sum) + 256;
|
|
ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
|
|
}
|
|
|
|
#else
|
|
|
|
#define in_cksum_update(ip) \
|
|
do { \
|
|
int __tmpsum; \
|
|
__tmpsum = (int)ntohs(ip->ip_sum) + 256; \
|
|
ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \
|
|
} while(0)
|
|
|
|
#endif
|
|
|
|
#ifdef _KERNEL
|
|
u_int in_cksum_hdr(const struct ip *ip);
|
|
u_short in_addword(u_short sum, u_short b);
|
|
u_short in_pseudo(u_int sum, u_int b, u_int c);
|
|
u_short in_cksum_skip(struct mbuf *m, int len, int skip);
|
|
#endif
|
|
|
|
#endif /* _MACHINE_IN_CKSUM_H_ */
|