46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync/* $NetBSD: in_cksum.c,v 1.7 1997/09/02 13:18:15 thorpej Exp $ */
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync/*-
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * Copyright (c) 1988, 1992, 1993
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * The Regents of the University of California. All rights reserved.
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * Copyright (c) 1996
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * Matt Thomas <matt@3am-software.com>
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync *
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * Redistribution and use in source and binary forms, with or without
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * modification, are permitted provided that the following conditions
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * are met:
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * 1. Redistributions of source code must retain the above copyright
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * notice, this list of conditions and the following disclaimer.
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * 2. Redistributions in binary form must reproduce the above copyright
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * notice, this list of conditions and the following disclaimer in the
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * documentation and/or other materials provided with the distribution.
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * 3. All advertising materials mentioning features or use of this software
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * must display the following acknowledgement:
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * This product includes software developed by the University of
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * California, Berkeley and its contributors.
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * 4. Neither the name of the University nor the names of its contributors
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * may be used to endorse or promote products derived from this software
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * without specific prior written permission.
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync *
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * SUCH DAMAGE.
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync *
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * @(#)in_cksum.c 8.1 (Berkeley) 6/10/93
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync */
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#ifndef VBOX
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync__FBSDID("$FreeBSD: src/sys/amd64/amd64/in_cksum.c,v 1.5.20.1 2009/04/15 03:14:26 kensmith Exp $");
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#include <sys/param.h>
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#include <sys/mbuf.h>
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#include <sys/systm.h>
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#include <netinet/in_systm.h>
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#include <netinet/in.h>
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#include <netinet/ip.h>
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#include <machine/in_cksum.h>
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#else
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync# include "in_cksum.h"
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync# include "slirp.h"
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#endif
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync/*
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * Checksum routine for Internet Protocol family headers
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * (Portable Alpha version).
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync *
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * This routine is very heavily used in the network
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * code and should be modified for each CPU to be as fast as possible.
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync */
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#define ADDCARRY(x) (x > 65535 ? x -= 65535 : x)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#define REDUCE32 \
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync { \
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync q_util.q = sum; \
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum = q_util.s[0] + q_util.s[1] + q_util.s[2] + q_util.s[3]; \
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#define REDUCE16 \
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync { \
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync q_util.q = sum; \
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync l_util.l = q_util.s[0] + q_util.s[1] + q_util.s[2] + q_util.s[3]; \
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum = l_util.s[0] + l_util.s[1]; \
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync ADDCARRY(sum); \
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncstatic const u_int32_t in_masks[] = {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync /*0 bytes*/ /*1 byte*/ /*2 bytes*/ /*3 bytes*/
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync 0x00000000, 0x000000FF, 0x0000FFFF, 0x00FFFFFF, /* offset 0 */
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync 0x00000000, 0x0000FF00, 0x00FFFF00, 0xFFFFFF00, /* offset 1 */
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync 0x00000000, 0x00FF0000, 0xFFFF0000, 0xFFFF0000, /* offset 2 */
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync 0x00000000, 0xFF000000, 0xFF000000, 0xFF000000, /* offset 3 */
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync};
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncunion l_util {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int16_t s[2];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int32_t l;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync};
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncunion q_util {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int16_t s[4];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int32_t l[2];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int64_t q;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync};
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncstatic u_int64_t
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncin_cksumdata(const void *buf, int len)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync{
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync const u_int32_t *lw = (const u_int32_t *) buf;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int64_t sum = 0;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int64_t prefilled;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync int offset;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync union q_util q_util;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if ((3 & (long) lw) == 0 && len == 20) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum = (u_int64_t) lw[0] + lw[1] + lw[2] + lw[3] + lw[4];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync REDUCE32;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync return sum;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if ((offset = 3 & (long) lw) != 0) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync const u_int32_t *masks = in_masks + (offset << 2);
b50f475667d5c02e9e0cbfa98997767acb3d10a6vboxsync lw = (u_int32_t *) (((RTHCUINTPTR) lw) - offset);
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum = *lw++ & masks[len >= 3 ? 3 : len];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync len -= 4 - offset;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if (len <= 0) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync REDUCE32;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync return sum;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#if 0
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync /*
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * Force to cache line boundary.
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync */
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync offset = 32 - (0x1f & (long) lw);
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if (offset < 32 && len > offset) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync len -= offset;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if (4 & offset) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum += (u_int64_t) lw[0];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync lw += 1;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if (8 & offset) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum += (u_int64_t) lw[0] + lw[1];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync lw += 2;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if (16 & offset) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum += (u_int64_t) lw[0] + lw[1] + lw[2] + lw[3];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync lw += 4;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync#endif
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync /*
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * access prefilling to start load of next cache line.
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * then add current cache line
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync * save result of prefilling for loop iteration.
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync */
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync prefilled = lw[0];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync while ((len -= 32) >= 4) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int64_t prefilling = lw[8];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum += prefilled + lw[1] + lw[2] + lw[3]
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync + lw[4] + lw[5] + lw[6] + lw[7];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync lw += 8;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync prefilled = prefilling;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if (len >= 0) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum += prefilled + lw[1] + lw[2] + lw[3]
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync + lw[4] + lw[5] + lw[6] + lw[7];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync lw += 8;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync } else {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync len += 32;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync while ((len -= 16) >= 0) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum += (u_int64_t) lw[0] + lw[1] + lw[2] + lw[3];
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync lw += 4;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync len += 16;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync while ((len -= 4) >= 0) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum += (u_int64_t) *lw++;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync len += 4;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if (len > 0)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum += (u_int64_t) (in_masks[len] & *lw);
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync REDUCE32;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync return sum;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync}
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncu_short
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncin_addword(u_short a, u_short b)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync{
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int64_t sum = a + b;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync ADDCARRY(sum);
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync return (sum);
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync}
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncu_short
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncin_pseudo(u_int32_t a, u_int32_t b, u_int32_t c)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync{
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int64_t sum;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync union q_util q_util;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync union l_util l_util;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum = (u_int64_t) a + b + c;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync REDUCE16;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync return (sum);
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync}
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncu_short
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncin_cksum_skip(struct mbuf *m, int len, int skip)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync{
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int64_t sum = 0;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync int mlen = 0;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync int clen = 0;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync caddr_t addr;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync union q_util q_util;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync union l_util l_util;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync len -= skip;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync for (; skip && m; m = m->m_next) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if (m->m_len > skip) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync mlen = m->m_len - skip;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync addr = mtod(m, caddr_t) + skip;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync goto skip_start;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync } else {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync skip -= m->m_len;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync for (; m && len; m = m->m_next) {
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if (m->m_len == 0)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync continue;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync mlen = m->m_len;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync addr = mtod(m, caddr_t);
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncskip_start:
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if (len < mlen)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync mlen = len;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync if ((clen ^ (long) addr) & 1)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum += in_cksumdata(addr, mlen) << 8;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync else
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync sum += in_cksumdata(addr, mlen);
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync clen += mlen;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync len -= mlen;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync }
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync REDUCE16;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync return (~sum & 0xffff);
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync}
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsyncu_int in_cksum_hdr(const struct ip *ip)
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync{
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync u_int64_t sum = in_cksumdata(ip, sizeof(struct ip));
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync union q_util q_util;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync union l_util l_util;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync REDUCE16;
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync return (~sum & 0xffff);
46192b2e5dd6b322ba3d1aae79e97074d50cdf89vboxsync}