The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_ecn.c

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    1 /*      $FreeBSD$       */
    2 /*      $KAME: ip_ecn.c,v 1.11 2001/05/03 16:09:29 itojun Exp $ */
    3 
    4 /*
    5  * Copyright (C) 1999 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  */
   33 /*
   34  * ECN consideration on tunnel ingress/egress operation.
   35  * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt
   36  */
   37 
   38 #include "opt_inet.h"
   39 #include "opt_inet6.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/malloc.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/errno.h>
   46 
   47 #include <netinet/in.h>
   48 #include <netinet/in_systm.h>
   49 #include <netinet/ip.h>
   50 #ifdef INET6
   51 #include <netinet/ip6.h>
   52 #endif
   53 
   54 #include <netinet/ip_ecn.h>
   55 #ifdef INET6
   56 #include <netinet6/ip6_ecn.h>
   57 #endif
   58 
   59 /*
   60  * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
   61  */
   62 void
   63 ip_ecn_ingress(mode, outer, inner)
   64         int mode;
   65         u_int8_t *outer;
   66         const u_int8_t *inner;
   67 {
   68         if (!outer || !inner)
   69                 panic("NULL pointer passed to ip_ecn_ingress");
   70 
   71         *outer = *inner;
   72         switch (mode) {
   73         case ECN_ALLOWED:               /* ECN allowed */
   74                 *outer &= ~IPTOS_CE;
   75                 break;
   76         case ECN_FORBIDDEN:             /* ECN forbidden */
   77                 *outer &= ~(IPTOS_ECT | IPTOS_CE);
   78                 break;
   79         case ECN_NOCARE:        /* no consideration to ECN */
   80                 break;
   81         }
   82 }
   83 
   84 /*
   85  * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
   86  */
   87 void
   88 ip_ecn_egress(mode, outer, inner)
   89         int mode;
   90         const u_int8_t *outer;
   91         u_int8_t *inner;
   92 {
   93         if (!outer || !inner)
   94                 panic("NULL pointer passed to ip_ecn_egress");
   95 
   96         switch (mode) {
   97         case ECN_ALLOWED:
   98                 if (*outer & IPTOS_CE)
   99                         *inner |= IPTOS_CE;
  100                 break;
  101         case ECN_FORBIDDEN:             /* ECN forbidden */
  102         case ECN_NOCARE:        /* no consideration to ECN */
  103                 break;
  104         }
  105 }
  106 
  107 #ifdef INET6
  108 void
  109 ip6_ecn_ingress(mode, outer, inner)
  110         int mode;
  111         u_int32_t *outer;
  112         const u_int32_t *inner;
  113 {
  114         u_int8_t outer8, inner8;
  115 
  116         if (!outer || !inner)
  117                 panic("NULL pointer passed to ip6_ecn_ingress");
  118 
  119         outer8 = (ntohl(*outer) >> 20) & 0xff;
  120         inner8 = (ntohl(*inner) >> 20) & 0xff;
  121         ip_ecn_ingress(mode, &outer8, &inner8);
  122         *outer &= ~htonl(0xff << 20);
  123         *outer |= htonl((u_int32_t)outer8 << 20);
  124 }
  125 
  126 void
  127 ip6_ecn_egress(mode, outer, inner)
  128         int mode;
  129         const u_int32_t *outer;
  130         u_int32_t *inner;
  131 {
  132         u_int8_t outer8, inner8;
  133 
  134         if (!outer || !inner)
  135                 panic("NULL pointer passed to ip6_ecn_egress");
  136 
  137         outer8 = (ntohl(*outer) >> 20) & 0xff;
  138         inner8 = (ntohl(*inner) >> 20) & 0xff;
  139         ip_ecn_egress(mode, &outer8, &inner8);
  140         *inner &= ~htonl(0xff << 20);
  141         *inner |= htonl((u_int32_t)inner8 << 20);
  142 }
  143 #endif

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