2fb2ae3251
Both available for IPv4 and IPv6. Basic implementation test results are available at http://netbsd-soc.sourceforge.net/projects/ecn/testresults.html. Work sponsored by the Google Summer of Code project 2006. Special thanks to Kentaro Kurahone, Allen Briggs and Matt Thomas for their help, comments and support during the project.
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/* $NetBSD: ip_ecn.c,v 1.15 2006/09/05 00:29:36 rpaulo Exp $ */
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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 <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ip_ecn.c,v 1.15 2006/09/05 00:29:36 rpaulo Exp $");
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#include "opt_inet.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.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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/*
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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(int mode, u_int8_t *outer, 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_ECN_CE;
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break;
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case ECN_FORBIDDEN: /* ECN forbidden */
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*outer &= ~(IPTOS_ECN_ECT0 | IPTOS_ECN_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(int mode, const u_int8_t *outer, 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_ECN_CE)
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*inner |= IPTOS_ECN_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(int mode, u_int32_t *outer, 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(int mode, const u_int32_t *outer, 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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