233 lines
6.8 KiB
C
233 lines
6.8 KiB
C
/*
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* Copyright (c) 2000-2016 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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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/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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#include <netinet/ip6.h>
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#include <netinet/ip_ecn.h>
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#include <netinet6/ip6_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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}
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*outer = *inner;
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switch (mode) {
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case ECN_NORMAL: /* ECN normal mode, copy flags */
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break;
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case ECN_COMPATIBILITY: /* ECN compatibility mode */
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*outer &= ~IPTOS_ECN_MASK;
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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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int
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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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}
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switch (mode) {
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/* Process ECN for both normal and compatibility modes */
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case ECN_NORMAL:
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case ECN_COMPATIBILITY:
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if (((*outer & IPTOS_ECN_MASK) == IPTOS_ECN_CE) &&
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((*inner & IPTOS_ECN_MASK) != IPTOS_ECN_NOTECT)) {
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*inner |= IPTOS_ECN_CE;
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} else if ((*outer & IPTOS_ECN_MASK) == IPTOS_ECN_ECT1 &&
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(*inner & IPTOS_ECN_MASK) == IPTOS_ECN_ECT0) {
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*inner = *outer;
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}
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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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return 1;
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}
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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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}
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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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int
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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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}
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outer8 = (ntohl(*outer) >> 20) & 0xff;
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inner8 = (ntohl(*inner) >> 20) & 0xff;
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if (ip_ecn_egress(mode, &outer8, &inner8) == 0) {
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return 0;
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}
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*inner &= ~htonl(0xff << 20);
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*inner |= htonl((u_int32_t)inner8 << 20);
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return 1;
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}
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/*
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* Modify outer IPv6 ECN (Traffic Class) field according to inner IPv4 TOS field
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* on ingress operation (tunnel encapsulation).
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*/
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void
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ip46_ecn_ingress(int mode, u_int32_t *outer, const u_int8_t *tos)
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{
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u_int8_t outer8;
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if (!outer || !tos) {
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panic("NULL pointer passed to ip46_ecn_ingress");
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}
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ip_ecn_ingress(mode, &outer8, tos);
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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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/*
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* Modify inner IPv4 ECN (TOS) field according to output IPv6 ECN (Traffic Class)
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* on egress operation (tunnel decapsulation).
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*/
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int
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ip46_ecn_egress(int mode, const u_int32_t *outer, u_int8_t *tos)
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{
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u_int8_t outer8;
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if (!outer || !tos) {
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panic("NULL pointer passed to ip46_ecn_egress");
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}
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outer8 = (ntohl(*outer) >> 20) & 0xff;
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return ip_ecn_egress(mode, &outer8, tos);
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}
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/*
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* Modify outer IPv4 TOS field according to inner IPv6 ECN (Traffic Class)
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* on ingress operation (tunnel encapsulation).
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*/
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void
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ip64_ecn_ingress(int mode, u_int8_t *outer, const u_int32_t *inner)
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{
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u_int8_t inner8;
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if (!outer || !inner) {
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panic("NULL pointer passed to ip64_ecn_ingress");
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}
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inner8 = (ntohl(*inner) >> 20) & 0xff;
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ip_ecn_ingress(mode, outer, &inner8);
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}
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/*
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* Modify inner IPv6 ECN (Traffic Class) according to outer IPv4 TOS field
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* on egress operation (tunnel decapsulation).
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*/
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int
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ip64_ecn_egress(int mode, const u_int8_t *outer, u_int32_t *inner)
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{
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u_int8_t inner8;
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if (!outer || !inner) {
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panic("NULL pointer passed to ip64_ecn_egress");
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}
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inner8 = (ntohl(*inner) >> 20) & 0xff;
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if (ip_ecn_egress(mode, outer, &inner8) == 0) {
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return 0;
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}
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*inner &= ~htonl(0xff << 20);
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*inner |= htonl((u_int32_t)inner8 << 20);
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return 1;
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}
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