/* * Copyright (c) 2000,2007 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * 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 */ #include <sys/param.h> #include <sys/systm.h> #include <sys/malloc.h> #include <sys/mbuf.h> #include <sys/errno.h> #include <netinet/in.h> #include <netinet/in_systm.h> #include <netinet/ip.h> #if INET6 #include <netinet/ip6.h> #endif #include <netinet/ip_ecn.h> #if INET6 #include <netinet6/ip6_ecn.h> #endif /* * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation). */ void ip_ecn_ingress(mode, outer, inner) int mode; u_int8_t *outer; const u_int8_t *inner; { if (!outer || !inner) panic("NULL pointer passed to ip_ecn_ingress"); *outer = *inner; 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). */ void ip_ecn_egress(mode, outer, inner) int mode; const 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; } } #if INET6 void ip6_ecn_ingress(mode, outer, inner) int mode; u_int32_t *outer; const u_int32_t *inner; { u_int8_t outer8, inner8; if (!outer || !inner) panic("NULL pointer passed to ip6_ecn_ingress"); 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; const 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