177 lines
4.7 KiB
C
177 lines
4.7 KiB
C
/* in_cksum.h - x86 version in_cksum header file */
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/* Copyright 2001-2002 Wind River Systems, Inc. */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from tahoe: in_cksum.c 1.2 86/01/05
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* from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91
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* from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
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* $FreeBSD: src/sys/i386/include/in_cksum.h,v 1.7.2.1 2000/05/05 13:37:00 jlemon Exp $
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*/
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/*
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modification history
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--------------------
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01f,25aug05,dlk Add section tags.
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01e,24mar04,m_h INternet Checksum
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01d,20nov03,niq Remove copyright_wrs.h file inclusion
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01c,15nov03,rp updating header file path
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01b,25jul02,rvr removed DCC specific code
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01a,13sep01,hsh Created from BSD 4.3
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*/
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#ifndef _MACHINE_IN_CKSUM_H_
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#define _MACHINE_IN_CKSUM_H_ 1
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#include <sys/cdefs.h>
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/*
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* in_cksum_hdr - checksum on header only
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*
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* It is useful to have an Internet checksum routine which is inlineable
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* and optimized specifically for the task of computing IP header checksums
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* in the normal case (where there are no options and the header length is
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* therefore always exactly five 32-bit words.
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*/
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static __inline
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u_int in_cksum_hdr
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(
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const struct ip *ip
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)
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{
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register u_int sum = 0;
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int hlen = sizeof (struct ip);
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register u_short *w = (u_short *) ip;
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u_short remaining = 0;
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while (hlen > 1)
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{
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sum += *w++;
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hlen -= 2;
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}
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if (hlen == 1)
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{
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*(u_char *) (&remaining) = *(u_char *) w;
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sum += remaining;
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}
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sum = (sum & 0xffff) + (sum >> 16);
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if (sum > 0xffff)
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sum -= 0xffff;
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return ~sum & 0xffff;
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}
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/*
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* in_cksum_update
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*/
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static __inline
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void in_cksum_update
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(
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struct ip *ip
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)
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{
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int __tmpsum;
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__tmpsum = (int)ntohs(ip->ip_sum) + 256;
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ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
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}
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/*
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* in_pseudo - pre-checksum parts of pseudo-header
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*
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* Compute significant parts of the IPv4 checksum pseudo-header * for use in a
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* delayed TCP/UDP checksum calculation.
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*
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* Args:
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*
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* src Source IP address
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* dst Destination IP address
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* lenproto htons(proto-hdr-len + proto-number)
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*/
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static __inline
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u_int16_t in_pseudo
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(
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u_int32_t src,
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u_int32_t dst,
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u_int32_t lenproto
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)
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{
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u_int32_t sum;
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sum = lenproto +
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(u_int16_t)(src >> 16) +
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(u_int16_t)(src /*& 0xffff*/) +
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(u_int16_t)(dst >> 16) +
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(u_int16_t)(dst /*& 0xffff*/);
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sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/);
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if (sum > 0xffff)
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sum -= 0xffff;
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return (sum);
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}
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/*
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* in_addword - Add two 16-bit workd
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*
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* Add the two 16-bit network-order values, carry, and return.
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*/
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static __inline
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u_int16_t in_addword
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(
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u_int16_t a,
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u_int16_t b
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)
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{
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u_int32_t sum = a + b;
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if (sum > 0xffff)
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sum -= 0xffff;
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return (sum);
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}
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_WRS_FASTTEXT
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u_short in_cksum_skip(struct mbuf *m, int len, int skip);
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#endif /* _MACHINE_IN_CKSUM_H_ */
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