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143 lines
3.8 KiB
C
143 lines
3.8 KiB
C
/* $FreeBSD$ */
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/* $KAME: ip_ecn.c,v 1.11 2001/05/03 16:09:29 itojun 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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/*
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* ECN consideration on tunnel ingress/egress operation.
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* http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt
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*/
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/errno.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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#ifdef INET6
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#include <netinet/ip6.h>
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#endif
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#include <netinet/ip_ecn.h>
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#ifdef INET6
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#include <netinet6/ip6_ecn.h>
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#endif
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/*
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* modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
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*/
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void
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ip_ecn_ingress(mode, outer, inner)
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int mode;
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u_int8_t *outer;
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const u_int8_t *inner;
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{
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if (!outer || !inner)
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panic("NULL pointer passed to ip_ecn_ingress");
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*outer = *inner;
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switch (mode) {
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case ECN_ALLOWED: /* ECN allowed */
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*outer &= ~IPTOS_CE;
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break;
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case ECN_FORBIDDEN: /* ECN forbidden */
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*outer &= ~(IPTOS_ECT | IPTOS_CE);
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break;
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case ECN_NOCARE: /* no consideration to ECN */
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break;
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}
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}
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/*
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* modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
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*/
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void
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ip_ecn_egress(mode, outer, inner)
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int mode;
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const u_int8_t *outer;
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u_int8_t *inner;
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{
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if (!outer || !inner)
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panic("NULL pointer passed to ip_ecn_egress");
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switch (mode) {
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case ECN_ALLOWED:
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if (*outer & IPTOS_CE)
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*inner |= IPTOS_CE;
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break;
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case ECN_FORBIDDEN: /* ECN forbidden */
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case ECN_NOCARE: /* no consideration to ECN */
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break;
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}
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}
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#ifdef INET6
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void
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ip6_ecn_ingress(mode, outer, inner)
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int mode;
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u_int32_t *outer;
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const u_int32_t *inner;
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{
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u_int8_t outer8, inner8;
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if (!outer || !inner)
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panic("NULL pointer passed to ip6_ecn_ingress");
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outer8 = (ntohl(*outer) >> 20) & 0xff;
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inner8 = (ntohl(*inner) >> 20) & 0xff;
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ip_ecn_ingress(mode, &outer8, &inner8);
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*outer &= ~htonl(0xff << 20);
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*outer |= htonl((u_int32_t)outer8 << 20);
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}
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void
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ip6_ecn_egress(mode, outer, inner)
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int mode;
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const u_int32_t *outer;
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u_int32_t *inner;
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{
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u_int8_t outer8, inner8;
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if (!outer || !inner)
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panic("NULL pointer passed to ip6_ecn_egress");
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outer8 = (ntohl(*outer) >> 20) & 0xff;
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inner8 = (ntohl(*inner) >> 20) & 0xff;
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ip_ecn_egress(mode, &outer8, &inner8);
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*inner &= ~htonl(0xff << 20);
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*inner |= htonl((u_int32_t)inner8 << 20);
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}
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#endif
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