bsd/netinet/ip_ecn.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (C) 1999 WIDE Project.
  24  * All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. Neither the name of the project nor the names of its contributors
  35  *    may be used to endorse or promote products derived from this software
  36  *    without specific prior written permission.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  39  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  41  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  42  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  43  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  44  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  45  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  46  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  47  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  48  * SUCH DAMAGE.
  49  *
  50  */
  51 /*
  52  * ECN consideration on tunnel ingress/egress operation.
  53  * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt
  54  */
  55
  56 #include <sys/param.h>
  57 #include <sys/systm.h>
  58 #include <sys/malloc.h>
  59 #include <sys/mbuf.h>
  60 #include <sys/errno.h>
  61
  62 #include <netinet/in.h>
  63 #include <netinet/in_systm.h>
  64 #include <netinet/ip.h>
  65 #if INET6
  66 #include <netinet/ip6.h>
  67 #endif
  68
  69 #include <netinet/ip_ecn.h>
  70 #if INET6
  71 #include <netinet6/ip6_ecn.h>
  72 #endif
  73
  74 /*
  75  * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
  76  */
  77 void
  78 ip_ecn_ingress(mode, outer, inner)
  79         int mode;
  80         u_int8_t *outer;
  81         const u_int8_t *inner;
  82 {
  83         if (!outer || !inner)
  84                 panic("NULL pointer passed to ip_ecn_ingress");
  85
  86         *outer = *inner;
  87         switch (mode) {
  88         case ECN_ALLOWED:               /* ECN allowed */
  89                 *outer &= ~IPTOS_CE;
  90                 break;
  91         case ECN_FORBIDDEN:             /* ECN forbidden */
  92                 *outer &= ~(IPTOS_ECT | IPTOS_CE);
  93                 break;
  94         case ECN_NOCARE:        /* no consideration to ECN */
  95                 break;
  96         }
  97 }
  98
  99 /*
 100  * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
 101  */
 102 void
 103 ip_ecn_egress(mode, outer, inner)
 104         int mode;
 105         const u_int8_t *outer;
 106         u_int8_t *inner;
 107 {
 108         if (!outer || !inner)
 109                 panic("NULL pointer passed to ip_ecn_egress");
 110
 111         switch (mode) {
 112         case ECN_ALLOWED:
 113                 if (*outer & IPTOS_CE)
 114                         *inner |= IPTOS_CE;
 115                 break;
 116         case ECN_FORBIDDEN:             /* ECN forbidden */
 117         case ECN_NOCARE:        /* no consideration to ECN */
 118                 break;
 119         }
 120 }
 121
 122 #if INET6
 123 void
 124 ip6_ecn_ingress(mode, outer, inner)
 125         int mode;
 126         u_int32_t *outer;
 127         const u_int32_t *inner;
 128 {
 129         u_int8_t outer8, inner8;
 130
 131         if (!outer || !inner)
 132                 panic("NULL pointer passed to ip6_ecn_ingress");
 133
 134         inner8 = (ntohl(*inner) >> 20) & 0xff;
 135         ip_ecn_ingress(mode, &outer8, &inner8);
 136         *outer &= ~htonl(0xff << 20);
 137         *outer |= htonl((u_int32_t)outer8 << 20);
 138 }
 139
 140 void
 141 ip6_ecn_egress(mode, outer, inner)
 142         int mode;
 143         const u_int32_t *outer;
 144         u_int32_t *inner;
 145 {
 146         u_int8_t outer8, inner8;
 147
 148         if (!outer || !inner)
 149                 panic("NULL pointer passed to ip6_ecn_egress");
 150
 151         outer8 = (ntohl(*outer) >> 20) & 0xff;
 152         ip_ecn_egress(mode, &outer8, &inner8);
 153         *inner &= ~htonl(0xff << 20);
 154         *inner |= htonl((u_int32_t)inner8 << 20);
 155 }
 156 #endif