6e869e402d
- All three functions are included in the kernel by default. They call a backend function cpu_in_cksum after possibly computing the checksum of the pseudo header. - cpu_in_cksum is the core to implement the one-complement sum. The default implementation is moderate fast on most platforms and provides a 32bit accumulator with 16bit addends for L32 platforms and a 64bit accumulator with 32bit addends for L64 platforms. It handles edge cases like very large mbuf chains (could happen with native IPv6 in the future) and provides a good base for new native implementations. - Modify i386 and amd64 assembly to use the new interface. This disables the MD implementations on !x86 until the conversion is done. For Alpha, the portable version is faster.
117 lines
4.6 KiB
C
117 lines
4.6 KiB
C
/* $NetBSD: in4_cksum.c,v 1.15 2008/01/25 21:12:15 joerg Exp $ */
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/*
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* Copyright (C) 1999 WIDE Project.
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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. Neither the name of the project 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 PROJECT 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 PROJECT 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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/*
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* Copyright (c) 1988, 1992, 1993
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* The Regents of the University of California. 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. 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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* @(#)in_cksum.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: in4_cksum.c,v 1.15 2008/01/25 21:12:15 joerg Exp $");
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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/*
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* Checksum routine for Internet Protocol family headers (Portable Version).
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* This is only for IPv4 pseudo header checksum.
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* No need to clear non-pseudo-header fields in IPv4 header.
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* len is for actual payload size, and does not include IPv4 header and
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* skipped header chain (off + len should be equal to the whole packet).
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*/
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int
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in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len)
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{
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uint32_t sum;
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union {
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struct ipovly ipov;
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uint16_t w[10];
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} u;
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uint16_t *w;
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sum = 0;
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if (nxt == 0)
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goto skip_phdr;
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/* pseudo header */
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if (off < sizeof(struct ipovly))
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panic("in4_cksum: offset too short");
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if (m->m_len < sizeof(struct ip))
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panic("in4_cksum: bad mbuf chain");
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bzero(&u.ipov, sizeof(u.ipov));
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u.ipov.ih_len = htons(len);
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u.ipov.ih_pr = nxt;
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u.ipov.ih_src = mtod(m, struct ip *)->ip_src;
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u.ipov.ih_dst = mtod(m, struct ip *)->ip_dst;
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w = u.w;
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/* assumes sizeof(ipov) == 20 */
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sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3]; sum += w[4];
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sum += w[5]; sum += w[6]; sum += w[7]; sum += w[8]; sum += w[9];
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skip_phdr:
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return cpu_in_cksum(m, len, off, sum);
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}
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