338 lines
9.2 KiB
C
338 lines
9.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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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* $KAME: in6_cksum.c,v 1.10 2000/12/03 00:53:59 itojun Exp $
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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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#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 <netinet/in.h>
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#include <netinet/ip6.h>
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#include <netinet6/scope6_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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#define ADDCARRY(x) (x > 65535 ? x -= 65535 : x)
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#define REDUCE {l_util.l = sum; sum = l_util.s[0] + l_util.s[1]; (void)ADDCARRY(sum);}
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union l_util {
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uint16_t s[2];
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uint32_t l;
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};
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union s_util {
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uint8_t c[2];
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uint16_t s;
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};
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static int
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_in6_cksum_pseudo(struct ip6_hdr *ip6, uint32_t len, uint8_t nxt, uint16_t csum)
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{
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int sum;
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uint16_t scope, *w;
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union {
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u_int16_t phs[4];
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struct {
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u_int32_t ph_len;
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u_int8_t ph_zero[3];
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u_int8_t ph_nxt;
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} __packed ph;
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} uph;
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sum = csum;
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/*
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* First create IP6 pseudo header and calculate a summary.
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*/
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uph.ph.ph_len = htonl(len);
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uph.ph.ph_zero[0] = uph.ph.ph_zero[1] = uph.ph.ph_zero[2] = 0;
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uph.ph.ph_nxt = nxt;
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/* Payload length and upper layer identifier. */
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sum += uph.phs[0]; sum += uph.phs[1];
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sum += uph.phs[2]; sum += uph.phs[3];
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/* IPv6 source address. */
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scope = in6_getscope(&ip6->ip6_src);
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w = (u_int16_t *)&ip6->ip6_src;
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sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3];
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sum += w[4]; sum += w[5]; sum += w[6]; sum += w[7];
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if (scope != 0)
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sum -= scope;
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/* IPv6 destination address. */
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scope = in6_getscope(&ip6->ip6_dst);
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w = (u_int16_t *)&ip6->ip6_dst;
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sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3];
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sum += w[4]; sum += w[5]; sum += w[6]; sum += w[7];
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if (scope != 0)
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sum -= scope;
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return (sum);
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}
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int
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in6_cksum_pseudo(struct ip6_hdr *ip6, uint32_t len, uint8_t nxt, uint16_t csum)
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{
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union l_util l_util;
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int sum;
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sum = _in6_cksum_pseudo(ip6, len, nxt, csum);
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REDUCE;
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return (sum);
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}
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static int
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in6_cksumdata(void *data, int *lenp, uint8_t *residp, int rlen)
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{
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union l_util l_util;
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union s_util s_util;
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uint16_t *w;
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int len, sum;
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bool byte_swapped;
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KASSERT(*lenp >= 0, ("%s: negative len %d", __func__, *lenp));
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KASSERT(rlen == 0 || rlen == 1, ("%s: rlen %d", __func__, rlen));
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len = *lenp;
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sum = 0;
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if (len == 0) {
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len = rlen;
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goto out;
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}
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byte_swapped = false;
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w = data;
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/*
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* Do we have a residual byte left over from the previous buffer?
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*/
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if (rlen == 1) {
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s_util.c[0] = *residp;
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s_util.c[1] = *(uint8_t *)w;
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sum += s_util.s;
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w = (uint16_t *)((uint8_t *)w + 1);
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len--;
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rlen = 0;
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}
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/*
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* Force to even boundary.
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*/
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if ((1 & (uintptr_t)w) && len > 0) {
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REDUCE;
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sum <<= 8;
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s_util.c[0] = *(uint8_t *)w;
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w = (uint16_t *)((uint8_t *)w + 1);
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len--;
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byte_swapped = true;
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}
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/*
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* Unroll the loop to make overhead from branches &c small.
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*/
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while ((len -= 32) >= 0) {
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sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3];
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sum += w[4]; sum += w[5]; sum += w[6]; sum += w[7];
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sum += w[8]; sum += w[9]; sum += w[10]; sum += w[11];
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sum += w[12]; sum += w[13]; sum += w[14]; sum += w[15];
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w += 16;
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}
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len += 32;
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while ((len -= 8) >= 0) {
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sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3];
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w += 4;
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}
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len += 8;
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if (len == 0 && !byte_swapped)
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goto out;
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REDUCE;
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while ((len -= 2) >= 0) {
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sum += *w++;
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}
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if (byte_swapped) {
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REDUCE;
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sum <<= 8;
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if (len == -1) {
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s_util.c[1] = *(uint8_t *)w;
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sum += s_util.s;
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} else /* len == -2 */
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*residp = s_util.c[0];
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len++;
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} else if (len == -1)
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*residp = *(uint8_t *)w;
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out:
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*lenp = len & 1;
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return (sum);
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}
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struct in6_cksum_partial_arg {
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int sum;
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int rlen;
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uint8_t resid;
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};
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static int
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in6_cksum_partial_one(void *_arg, void *data, u_int len)
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{
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struct in6_cksum_partial_arg *arg = _arg;
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arg->sum += in6_cksumdata(data, &len, &arg->resid, arg->rlen);
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arg->rlen = len;
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return (0);
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}
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/*
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* m MUST contain a contiguous IP6 header.
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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.
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* (e.g. TCP header + TCP payload)
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* cov is the number of bytes to be taken into account for the checksum
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*/
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int
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in6_cksum_partial(struct mbuf *m, uint8_t nxt, uint32_t off, uint32_t len,
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uint32_t cov)
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{
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struct in6_cksum_partial_arg arg;
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union l_util l_util;
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union s_util s_util;
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struct ip6_hdr *ip6;
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uint16_t *w, scope;
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int sum;
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union {
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uint16_t phs[4];
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struct {
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uint32_t ph_len;
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uint8_t ph_zero[3];
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uint8_t ph_nxt;
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} __packed ph;
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} uph;
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/* Sanity check. */
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KASSERT(m->m_pkthdr.len >= off + len, ("%s: mbuf len (%d) < off(%d)+"
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"len(%d)", __func__, m->m_pkthdr.len, off, len));
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KASSERT(m->m_len >= sizeof(*ip6),
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("%s: mbuf len %d < sizeof(ip6)", __func__, m->m_len));
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/*
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* First create IP6 pseudo header and calculate a summary.
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*/
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uph.ph.ph_len = htonl(len);
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uph.ph.ph_zero[0] = uph.ph.ph_zero[1] = uph.ph.ph_zero[2] = 0;
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uph.ph.ph_nxt = nxt;
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/* Payload length and upper layer identifier. */
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sum = uph.phs[0]; sum += uph.phs[1];
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sum += uph.phs[2]; sum += uph.phs[3];
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ip6 = mtod(m, struct ip6_hdr *);
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/* IPv6 source address. */
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scope = in6_getscope(&ip6->ip6_src);
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w = (uint16_t *)&ip6->ip6_src;
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sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3];
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sum += w[4]; sum += w[5]; sum += w[6]; sum += w[7];
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if (scope != 0)
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sum -= scope;
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/* IPv6 destination address. */
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scope = in6_getscope(&ip6->ip6_dst);
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w = (uint16_t *)&ip6->ip6_dst;
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sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3];
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sum += w[4]; sum += w[5]; sum += w[6]; sum += w[7];
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if (scope != 0)
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sum -= scope;
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/*
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* Loop over the rest of the mbuf chain and compute the rest of the
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* checksum. m_apply() handles unmapped mbufs.
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*/
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arg.sum = sum;
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arg.rlen = 0;
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(void)m_apply(m, off, cov, in6_cksum_partial_one, &arg);
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sum = arg.sum;
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/*
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* Handle a residual byte.
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*/
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if (arg.rlen == 1) {
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s_util.c[0] = arg.resid;
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s_util.c[1] = 0;
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sum += s_util.s;
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}
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REDUCE;
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return (~sum & 0xffff);
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}
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int
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in6_cksum(struct mbuf *m, uint8_t nxt, uint32_t off, uint32_t len)
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{
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return (in6_cksum_partial(m, nxt, off, len, len));
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}
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