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ip_ecn.c revision 1.4 
      1 /*	$NetBSD: ip_ecn.c,v 1.4 1999/07/06 12:23:20 itojun Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 1999 WIDE Project.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the project nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  * KAME Id: ip_ecn.c,v 1.1.4.1 1999/05/07 15:59:14 itojun Exp
     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 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
     39 #include "opt_inet.h"
     40 #endif
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/malloc.h>
     45 #include <sys/mbuf.h>
     46 #include <sys/errno.h>
     47 
     48 #ifdef INET
     49 #include <netinet/in.h>
     50 #include <netinet/in_systm.h>
     51 #include <netinet/ip.h>
     52 #endif
     53 
     54 #ifdef INET6
     55 #ifndef INET
     56 #include <netinet/in.h>
     57 #endif
     58 #include <netinet6/in6_systm.h>
     59 #include <netinet/ip6.h>
     60 #endif
     61 
     62 #include <netinet/ip_ecn.h>
     63 
     64 /*
     65  * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
     66  * call it after you've done the default initialization/copy for the outer.
     67  */
     68 void
     69 ip_ecn_ingress(mode, outer, inner)
     70 	int mode;
     71 	u_int8_t *outer;
     72 	u_int8_t *inner;
     73 {
     74 	if (!outer || !inner)
     75 		panic("NULL pointer passed to ip_ecn_ingress");
     76 
     77 	switch (mode) {
     78 	case ECN_ALLOWED:		/* ECN allowed */
     79 		*outer &= ~IPTOS_CE;
     80 		break;
     81 	case ECN_FORBIDDEN:		/* ECN forbidden */
     82 		*outer &= ~(IPTOS_ECT | IPTOS_CE);
     83 		break;
     84 	case ECN_NOCARE:	/* no consideration to ECN */
     85 		break;
     86 	}
     87 }
     88 
     89 /*
     90  * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
     91  * call it after you've done the default initialization/copy for the inner.
     92  */
     93 void
     94 ip_ecn_egress(mode, outer, inner)
     95 	int mode;
     96 	u_int8_t *outer;
     97 	u_int8_t *inner;
     98 {
     99 	if (!outer || !inner)
    100 		panic("NULL pointer passed to ip_ecn_egress");
    101 
    102 	switch (mode) {
    103 	case ECN_ALLOWED:
    104 		if (*outer & IPTOS_CE)
    105 			*inner |= IPTOS_CE;
    106 		break;
    107 	case ECN_FORBIDDEN:		/* ECN forbidden */
    108 	case ECN_NOCARE:	/* no consideration to ECN */
    109 		break;
    110 	}
    111 }
    112 
    113 #ifdef INET6
    114 void
    115 ip6_ecn_ingress(mode, outer, inner)
    116 	int mode;
    117 	u_int32_t *outer;
    118 	u_int32_t *inner;
    119 {
    120 	u_int8_t outer8, inner8;
    121 
    122 	if (!outer || !inner)
    123 		panic("NULL pointer passed to ip6_ecn_ingress");
    124 
    125 	outer8 = (ntohl(*outer) >> 20) & 0xff;
    126 	inner8 = (ntohl(*inner) >> 20) & 0xff;
    127 	ip_ecn_ingress(mode, &outer8, &inner8);
    128 	*outer &= ~htonl(0xff << 20);
    129 	*outer |= htonl((u_int32_t)outer8 << 20);
    130 }
    131 
    132 void
    133 ip6_ecn_egress(mode, outer, inner)
    134 	int mode;
    135 	u_int32_t *outer;
    136 	u_int32_t *inner;
    137 {
    138 	u_int8_t outer8, inner8;
    139 
    140 	if (!outer || !inner)
    141 		panic("NULL pointer passed to ip6_ecn_egress");
    142 
    143 	outer8 = (ntohl(*outer) >> 20) & 0xff;
    144 	inner8 = (ntohl(*inner) >> 20) & 0xff;
    145 	ip_ecn_egress(mode, &outer8, &inner8);
    146 	*inner &= ~htonl(0xff << 20);
    147 	*inner |= htonl((u_int32_t)inner8 << 20);
    148 }
    149 #endif
    150