bsd/netinet/ip_ecn.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (C) 1999 WIDE Project.
  25  * All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. Neither the name of the project nor the names of its contributors
  36  *    may be used to endorse or promote products derived from this software
  37  *    without specific prior written permission.
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  40  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  42  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  43  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  44  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  45  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  47  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  48  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  49  * SUCH DAMAGE.
  50  *
  51  */
  52 /*
  53  * ECN consideration on tunnel ingress/egress operation.
  54  * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt
  55  */
  56
  57 #include <sys/param.h>
  58 #include <sys/systm.h>
  59 #include <sys/malloc.h>
  60 #include <sys/mbuf.h>
  61 #include <sys/errno.h>
  62
  63 #include <netinet/in.h>
  64 #include <netinet/in_systm.h>
  65 #include <netinet/ip.h>
  66 #if INET6
  67 #include <netinet/ip6.h>
  68 #endif
  69
  70 #include <netinet/ip_ecn.h>
  71 #if INET6
  72 #include <netinet6/ip6_ecn.h>
  73 #endif
  74
  75 /*
  76  * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
  77  */
  78 void
  79 ip_ecn_ingress(mode, outer, inner)
  80         int mode;
  81         u_int8_t *outer;
  82         const u_int8_t *inner;
  83 {
  84         if (!outer || !inner)
  85                 panic("NULL pointer passed to ip_ecn_ingress");
  86
  87         *outer = *inner;
  88         switch (mode) {
  89         case ECN_ALLOWED:               /* ECN allowed */
  90                 *outer &= ~IPTOS_CE;
  91                 break;
  92         case ECN_FORBIDDEN:             /* ECN forbidden */
  93                 *outer &= ~(IPTOS_ECT | IPTOS_CE);
  94                 break;
  95         case ECN_NOCARE:        /* no consideration to ECN */
  96                 break;
  97         }
  98 }
  99
 100 /*
 101  * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
 102  */
 103 void
 104 ip_ecn_egress(mode, outer, inner)
 105         int mode;
 106         const u_int8_t *outer;
 107         u_int8_t *inner;
 108 {
 109         if (!outer || !inner)
 110                 panic("NULL pointer passed to ip_ecn_egress");
 111
 112         switch (mode) {
 113         case ECN_ALLOWED:
 114                 if (*outer & IPTOS_CE)
 115                         *inner |= IPTOS_CE;
 116                 break;
 117         case ECN_FORBIDDEN:             /* ECN forbidden */
 118         case ECN_NOCARE:        /* no consideration to ECN */
 119                 break;
 120         }
 121 }
 122
 123 #if INET6
 124 void
 125 ip6_ecn_ingress(mode, outer, inner)
 126         int mode;
 127         u_int32_t *outer;
 128         const u_int32_t *inner;
 129 {
 130         u_int8_t outer8, inner8;
 131
 132         if (!outer || !inner)
 133                 panic("NULL pointer passed to ip6_ecn_ingress");
 134
 135         inner8 = (ntohl(*inner) >> 20) & 0xff;
 136         ip_ecn_ingress(mode, &outer8, &inner8);
 137         *outer &= ~htonl(0xff << 20);
 138         *outer |= htonl((u_int32_t)outer8 << 20);
 139 }
 140
 141 void
 142 ip6_ecn_egress(mode, outer, inner)
 143         int mode;
 144         const u_int32_t *outer;
 145         u_int32_t *inner;
 146 {
 147         u_int8_t outer8, inner8;
 148
 149         if (!outer || !inner)
 150                 panic("NULL pointer passed to ip6_ecn_egress");
 151
 152         outer8 = (ntohl(*outer) >> 20) & 0xff;
 153         ip_ecn_egress(mode, &outer8, &inner8);
 154         *inner &= ~htonl(0xff << 20);
 155         *inner |= htonl((u_int32_t)inner8 << 20);
 156 }
 157 #endif