282 lines
9.8 KiB
C
282 lines
9.8 KiB
C
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/*
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* Copyright (c) 2009-2012 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 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. 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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* @(#)in_cksum.c 8.1 (Berkeley) 6/10/93
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*/
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/*-
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* Copyright (c) 2008 Joerg Sonnenberger <joerg@NetBSD.org>.
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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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#include <sys/param.h>
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#include <machine/endian.h>
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#include <sys/mbuf.h>
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#include <sys/systm.h>
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#include <kern/debug.h>
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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/*
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* Checksum routine for Internet Protocol family headers (Portable Version).
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*
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* This routine is very heavily used in the network
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* code and should be modified for each CPU to be as fast as possible.
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*/
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/*
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* Compute IPv6 pseudo-header checksum; assumes 16-bit aligned pointers.
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*/
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uint16_t
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in6_pseudo(const struct in6_addr *src, const struct in6_addr *dst, uint32_t x)
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{
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uint32_t sum = 0;
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const uint16_t *w;
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/*
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* IPv6 source address
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*/
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w = (const uint16_t *)src;
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sum += w[0];
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if (!IN6_IS_SCOPE_EMBED(src)) {
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sum += w[1];
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}
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sum += w[2]; sum += w[3]; sum += w[4]; sum += w[5];
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sum += w[6]; sum += w[7];
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/*
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* IPv6 destination address
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*/
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w = (const uint16_t *)dst;
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sum += w[0];
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if (!IN6_IS_SCOPE_EMBED(dst)) {
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sum += w[1];
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}
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sum += w[2]; sum += w[3]; sum += w[4]; sum += w[5];
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sum += w[6]; sum += w[7];
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/*
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* Caller-supplied value; 'x' could be one of:
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*
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* htonl(proto + length), or
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* htonl(proto + length + sum)
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**/
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sum += x;
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/* fold in carry bits */
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ADDCARRY(sum);
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return (uint16_t)sum;
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}
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/*
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* m MUST contain at least an IPv6 header, if nxt is specified;
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* nxt is the upper layer protocol number;
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* off is an offset where TCP/UDP/ICMP6 header starts;
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* len is a total length of a transport segment (e.g. TCP header + TCP payload)
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*/
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u_int16_t
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inet6_cksum(struct mbuf *m, uint32_t nxt, uint32_t off, uint32_t len)
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{
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uint32_t sum;
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sum = m_sum16(m, off, len);
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if (nxt != 0) {
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struct ip6_hdr *ip6;
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unsigned char buf[sizeof(*ip6)] __attribute__((aligned(8)));
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uint32_t mlen;
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/*
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* Sanity check
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*
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* Use m_length2() instead of m_length(), as we cannot rely on
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* the caller setting m_pkthdr.len correctly, if the mbuf is
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* a M_PKTHDR one.
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*/
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if ((mlen = m_length2(m, NULL)) < sizeof(*ip6)) {
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panic("%s: mbuf %p pkt too short (%d) for IPv6 header",
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__func__, m, mlen);
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/* NOTREACHED */
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}
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/*
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* In case the IPv6 header is not contiguous, or not 32-bit
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* aligned, copy it to a local buffer. Note here that we
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* expect the data pointer to point to the IPv6 header.
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*/
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if ((sizeof(*ip6) > m->m_len) ||
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!IP6_HDR_ALIGNED_P(mtod(m, caddr_t))) {
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m_copydata(m, 0, sizeof(*ip6), (caddr_t)buf);
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ip6 = (struct ip6_hdr *)(void *)buf;
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} else {
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ip6 = (struct ip6_hdr *)(void *)(m->m_data);
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}
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/* add pseudo header checksum */
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sum += in6_pseudo(&ip6->ip6_src, &ip6->ip6_dst,
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htonl(nxt + len));
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/* fold in carry bits */
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ADDCARRY(sum);
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}
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return ~sum & 0xffff;
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}
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/*
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* buffer MUST contain at least an IPv6 header, if nxt is specified;
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* nxt is the upper layer protocol number;
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* off is an offset where TCP/UDP/ICMP6 header starts;
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* len is a total length of a transport segment (e.g. TCP header + TCP payload)
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*/
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u_int16_t
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inet6_cksum_buffer(const uint8_t *buffer, uint32_t nxt, uint32_t off,
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uint32_t len)
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{
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uint32_t sum;
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if (off >= len) {
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panic("%s: off (%d) >= len (%d)", __func__, off, len);
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}
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sum = b_sum16(&((const uint8_t *)buffer)[off], len);
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if (nxt != 0) {
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const struct ip6_hdr *ip6;
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unsigned char buf[sizeof(*ip6)] __attribute__((aligned(8)));
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/*
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* In case the IPv6 header is not contiguous, or not 32-bit
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* aligned, copy it to a local buffer. Note here that we
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* expect the data pointer to point to the IPv6 header.
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*/
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if (!IP6_HDR_ALIGNED_P(buffer)) {
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memcpy(buf, buffer, sizeof(*ip6));
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ip6 = (const struct ip6_hdr *)(const void *)buf;
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} else {
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ip6 = (const struct ip6_hdr *)buffer;
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}
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/* add pseudo header checksum */
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sum += in6_pseudo(&ip6->ip6_src, &ip6->ip6_dst,
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htonl(nxt + len));
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/* fold in carry bits */
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ADDCARRY(sum);
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}
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return ~sum & 0xffff;
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}
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