192 lines
5.2 KiB
C
192 lines
5.2 KiB
C
/* in_cksum.h - ppc version in_cksum routines */
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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/ppc/include/in_cksum.h,v 1.5 2000/05/06 18:18:31 jlemon Exp $
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*/
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/*
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modification history
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--------------------
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01e,25aug05,dlk Add section tags.
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01d,24mar04,m_h Internet Checksum
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01c,17mar04,m_h move to h/arch/ppc, move misc funcs from in_cksum.c
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01b,05nov03,rlm Ran batch header update for header re-org.
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01a,11jul02,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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union in_cksum_l_util {
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u_int16_t s[2];
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u_int32_t l;
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};
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union in_cksum_q_util {
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u_int16_t s[4];
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u_int32_t l[2];
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u_int64_t q;
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};
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#define IN_CKSUM_ADDCARRY(x) (x > 65535 ? x -= 65535 : x)
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#define IN_CKSUM_REDUCE16 \
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{ \
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in_cksum_q_util.q = sum; \
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in_cksum_l_util.l = in_cksum_q_util.s[0] + in_cksum_q_util.s[1] + \
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in_cksum_q_util.s[2] + in_cksum_q_util.s[3]; \
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sum = in_cksum_l_util.s[0] + in_cksum_l_util.s[1]; \
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IN_CKSUM_ADDCARRY(sum); \
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}
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#define IN_CKSUM_REDUCE2 {in_cksum_l_util.l = sum; \
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sum = in_cksum_l_util.s[0] + in_cksum_l_util.s[1]; \
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IN_CKSUM_ADDCARRY(sum);}
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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_short in_addword
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(
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u_short a,
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u_short b
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)
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{
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u_int64_t sum = a + b;
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IN_CKSUM_ADDCARRY(sum);
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return (sum);
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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_short in_pseudo
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(
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u_int32_t a,
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u_int32_t b,
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u_int32_t c
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)
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{
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u_int64_t sum;
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union in_cksum_q_util in_cksum_q_util;
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union in_cksum_l_util in_cksum_l_util;
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sum = (u_int64_t) a + b + c;
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IN_CKSUM_REDUCE16;
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return (sum);
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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_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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register u_short *w;
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union in_cksum_l_util in_cksum_l_util;
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w = (u_short*) ip;
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sum += w[0];
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sum += w[1];
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sum += w[2];
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sum += w[3];
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sum += w[4];
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IN_CKSUM_REDUCE2;
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sum += w[5];
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sum += w[6];
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sum += w[7];
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sum += w[8];
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sum += w[9];
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IN_CKSUM_REDUCE2;
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return ~sum & 0xffff;
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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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