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 /*      $NetBSD: ip_ecn.c,v 1.15 2006/09/05 00:29:36 rpaulo Exp $       */
    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 <sys/cdefs.h>
   39 __KERNEL_RCSID(0, "$NetBSD: ip_ecn.c,v 1.15 2006/09/05 00:29:36 rpaulo Exp $");
   40 
   41 #include "opt_inet.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/errno.h>
   48 
   49 #include <netinet/in.h>
   50 #include <netinet/in_systm.h>
   51 #include <netinet/ip.h>
   52 #ifdef INET6
   53 #include <netinet/ip6.h>
   54 #endif
   55 
   56 #include <netinet/ip_ecn.h>
   57 
   58 /*
   59  * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
   60  */
   61 void
   62 ip_ecn_ingress(int mode, u_int8_t *outer, const u_int8_t *inner)
   63 {
   64         if (!outer || !inner)
   65                 panic("NULL pointer passed to ip_ecn_ingress");
   66 
   67         *outer = *inner;
   68         switch (mode) {
   69         case ECN_ALLOWED:               /* ECN allowed */
   70                 *outer &= ~IPTOS_ECN_CE;
   71                 break;
   72         case ECN_FORBIDDEN:             /* ECN forbidden */
   73                 *outer &= ~(IPTOS_ECN_ECT0 | IPTOS_ECN_CE);
   74                 break;
   75         case ECN_NOCARE:        /* no consideration to ECN */
   76                 break;
   77         }
   78 }
   79 
   80 /*
   81  * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
   82  */
   83 void
   84 ip_ecn_egress(int mode, const u_int8_t *outer, u_int8_t *inner)
   85 {
   86         if (!outer || !inner)
   87                 panic("NULL pointer passed to ip_ecn_egress");
   88 
   89         switch (mode) {
   90         case ECN_ALLOWED:
   91                 if (*outer & IPTOS_ECN_CE)
   92                         *inner |= IPTOS_ECN_CE;
   93                 break;
   94         case ECN_FORBIDDEN:             /* ECN forbidden */
   95         case ECN_NOCARE:        /* no consideration to ECN */
   96                 break;
   97         }
   98 }
   99 
  100 #ifdef INET6
  101 void
  102 ip6_ecn_ingress(int mode, u_int32_t *outer, const u_int32_t *inner)
  103 {
  104         u_int8_t outer8, inner8;
  105 
  106         if (!outer || !inner)
  107                 panic("NULL pointer passed to ip6_ecn_ingress");
  108 
  109         outer8 = (ntohl(*outer) >> 20) & 0xff;
  110         inner8 = (ntohl(*inner) >> 20) & 0xff;
  111         ip_ecn_ingress(mode, &outer8, &inner8);
  112         *outer &= ~htonl(0xff << 20);
  113         *outer |= htonl((u_int32_t)outer8 << 20);
  114 }
  115 
  116 void
  117 ip6_ecn_egress(int mode, const u_int32_t *outer, u_int32_t *inner)
  118 {
  119         u_int8_t outer8, inner8;
  120 
  121         if (!outer || !inner)
  122                 panic("NULL pointer passed to ip6_ecn_egress");
  123 
  124         outer8 = (ntohl(*outer) >> 20) & 0xff;
  125         inner8 = (ntohl(*inner) >> 20) & 0xff;
  126         ip_ecn_egress(mode, &outer8, &inner8);
  127         *inner &= ~htonl(0xff << 20);
  128         *inner |= htonl((u_int32_t)inner8 << 20);
  129 }
  130 #endif

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