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/* $OpenBSD: ip_ecn.c,v 1.2 2001/02/16 08:48:04 itojun Exp $ */
/* $KAME: ip_ecn.c,v 1.9 2000/10/01 12:44:48 itojun Exp $ */
/*
* Copyright (C) 1999 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* ECN consideration on tunnel ingress/egress operation.
* http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt
*/
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
#include "opt_inet.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet/ip6.h>
#endif
#include <netinet/ip_ecn.h>
/*
* modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
* call it after you've done the default initialization/copy for the outer.
*/
void
ip_ecn_ingress(mode, outer, inner)
int mode;
u_int8_t *outer;
u_int8_t *inner;
{
if (!outer || !inner)
panic("NULL pointer passed to ip_ecn_ingress");
switch (mode) {
case ECN_ALLOWED: /* ECN allowed */
*outer &= ~IPTOS_CE;
break;
case ECN_FORBIDDEN: /* ECN forbidden */
*outer &= ~(IPTOS_ECT | IPTOS_CE);
break;
case ECN_NOCARE: /* no consideration to ECN */
break;
}
}
/*
* modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
* call it after you've done the default initialization/copy for the inner.
*/
void
ip_ecn_egress(mode, outer, inner)
int mode;
u_int8_t *outer;
u_int8_t *inner;
{
if (!outer || !inner)
panic("NULL pointer passed to ip_ecn_egress");
switch (mode) {
case ECN_ALLOWED:
if (*outer & IPTOS_CE)
*inner |= IPTOS_CE;
break;
case ECN_FORBIDDEN: /* ECN forbidden */
case ECN_NOCARE: /* no consideration to ECN */
break;
}
}
#ifdef INET6
void
ip6_ecn_ingress(mode, outer, inner)
int mode;
u_int32_t *outer;
u_int32_t *inner;
{
u_int8_t outer8, inner8;
if (!outer || !inner)
panic("NULL pointer passed to ip6_ecn_ingress");
outer8 = (ntohl(*outer) >> 20) & 0xff;
inner8 = (ntohl(*inner) >> 20) & 0xff;
ip_ecn_ingress(mode, &outer8, &inner8);
*outer &= ~htonl(0xff << 20);
*outer |= htonl((u_int32_t)outer8 << 20);
}
void
ip6_ecn_egress(mode, outer, inner)
int mode;
u_int32_t *outer;
u_int32_t *inner;
{
u_int8_t outer8, inner8;
if (!outer || !inner)
panic("NULL pointer passed to ip6_ecn_egress");
outer8 = (ntohl(*outer) >> 20) & 0xff;
inner8 = (ntohl(*inner) >> 20) & 0xff;
ip_ecn_egress(mode, &outer8, &inner8);
*inner &= ~htonl(0xff << 20);
*inner |= htonl((u_int32_t)inner8 << 20);
}
#endif
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