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ip_ecn.c revision 1.6.8.1 
      1 /*	$NetBSD: ip_ecn.c,v 1.6.8.1 1999/12/27 18:36:15 wrstuden 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 1.2 1999/07/30 12:17:15 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 <netinet/ip6.h>
     59 #endif
     60 
     61 #include <netinet/ip_ecn.h>
     62 
     63 /*
     64  * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
     65  * call it after you've done the default initialization/copy for the outer.
     66  */
     67 void
     68 ip_ecn_ingress(mode, outer, inner)
     69 	int mode;
     70 	u_int8_t *outer;
     71 	u_int8_t *inner;
     72 {
     73 	if (!outer || !inner)
     74 		panic("NULL pointer passed to ip_ecn_ingress");
     75 
     76 	switch (mode) {
     77 	case ECN_ALLOWED:		/* ECN allowed */
     78 		*outer &= ~IPTOS_CE;
     79 		break;
     80 	case ECN_FORBIDDEN:		/* ECN forbidden */
     81 		*outer &= ~(IPTOS_ECT | IPTOS_CE);
     82 		break;
     83 	case ECN_NOCARE:	/* no consideration to ECN */
     84 		break;
     85 	}
     86 }
     87 
     88 /*
     89  * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
     90  * call it after you've done the default initialization/copy for the inner.
     91  */
     92 void
     93 ip_ecn_egress(mode, outer, inner)
     94 	int mode;
     95 	u_int8_t *outer;
     96 	u_int8_t *inner;
     97 {
     98 	if (!outer || !inner)
     99 		panic("NULL pointer passed to ip_ecn_egress");
    100 
    101 	switch (mode) {
    102 	case ECN_ALLOWED:
    103 		if (*outer & IPTOS_CE)
    104 			*inner |= IPTOS_CE;
    105 		break;
    106 	case ECN_FORBIDDEN:		/* ECN forbidden */
    107 	case ECN_NOCARE:	/* no consideration to ECN */
    108 		break;
    109 	}
    110 }
    111 
    112 #ifdef INET6
    113 void
    114 ip6_ecn_ingress(mode, outer, inner)
    115 	int mode;
    116 	u_int32_t *outer;
    117 	u_int32_t *inner;
    118 {
    119 	u_int8_t outer8, inner8;
    120 
    121 	if (!outer || !inner)
    122 		panic("NULL pointer passed to ip6_ecn_ingress");
    123 
    124 	outer8 = (ntohl(*outer) >> 20) & 0xff;
    125 	inner8 = (ntohl(*inner) >> 20) & 0xff;
    126 	ip_ecn_ingress(mode, &outer8, &inner8);
    127 	*outer &= ~htonl(0xff << 20);
    128 	*outer |= htonl((u_int32_t)outer8 << 20);
    129 }
    130 
    131 void
    132 ip6_ecn_egress(mode, outer, inner)
    133 	int mode;
    134 	u_int32_t *outer;
    135 	u_int32_t *inner;
    136 {
    137 	u_int8_t outer8, inner8;
    138 
    139 	if (!outer || !inner)
    140 		panic("NULL pointer passed to ip6_ecn_egress");
    141 
    142 	outer8 = (ntohl(*outer) >> 20) & 0xff;
    143 	inner8 = (ntohl(*inner) >> 20) & 0xff;
    144 	ip_ecn_egress(mode, &outer8, &inner8);
    145 	*inner &= ~htonl(0xff << 20);
    146 	*inner |= htonl((u_int32_t)inner8 << 20);
    147 }
    148 #endif
    149