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ip_ecn.c revision 1.2.2.2 
      1 /*
      2  * Copyright (C) 1999 WIDE Project.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. Neither the name of the project nor the names of its contributors
     14  *    may be used to endorse or promote products derived from this software
     15  *    without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  *
     29  * $Id: ip_ecn.c,v 1.2.2.2 1999/07/01 23:47:01 thorpej Exp $
     30  */
     31 /*
     32  * ECN consideration on tunnel ingress/egress operation.
     33  * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt
     34  */
     35 
     36 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
     37 #include "opt_inet.h"
     38 #endif
     39 
     40 #include <sys/param.h>
     41 #include <sys/systm.h>
     42 #include <sys/malloc.h>
     43 #include <sys/mbuf.h>
     44 #include <sys/errno.h>
     45 
     46 #ifdef INET
     47 #include <netinet/in.h>
     48 #include <netinet/in_systm.h>
     49 #include <netinet/ip.h>
     50 #endif
     51 
     52 #ifdef INET6
     53 #ifndef INET
     54 #include <netinet/in.h>
     55 #endif
     56 #include <netinet6/in6_systm.h>
     57 #include <netinet/ip6.h>
     58 #endif
     59 
     60 #include <netinet/ip_ecn.h>
     61 
     62 /*
     63  * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
     64  * call it after you've done the default initialization/copy for the outer.
     65  */
     66 void
     67 ip_ecn_ingress(mode, outer, inner)
     68 	int mode;
     69 	u_int8_t *outer;
     70 	u_int8_t *inner;
     71 {
     72 	if (!outer || !inner)
     73 		panic("NULL pointer passed to ip_ecn_ingress");
     74 
     75 	switch (mode) {
     76 	case ECN_ALLOWED:		/* ECN allowed */
     77 		*outer &= ~IPTOS_CE;
     78 		break;
     79 	case ECN_FORBIDDEN:		/* ECN forbidden */
     80 		*outer &= ~(IPTOS_ECT | IPTOS_CE);
     81 		break;
     82 	case ECN_NOCARE:	/* no consideration to ECN */
     83 		break;
     84 	}
     85 }
     86 
     87 /*
     88  * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
     89  * call it after you've done the default initialization/copy for the inner.
     90  */
     91 void
     92 ip_ecn_egress(mode, outer, inner)
     93 	int mode;
     94 	u_int8_t *outer;
     95 	u_int8_t *inner;
     96 {
     97 	if (!outer || !inner)
     98 		panic("NULL pointer passed to ip_ecn_egress");
     99 
    100 	switch (mode) {
    101 	case ECN_ALLOWED:
    102 		if (*outer & IPTOS_CE)
    103 			*inner |= IPTOS_CE;
    104 		break;
    105 	case ECN_FORBIDDEN:		/* ECN forbidden */
    106 	case ECN_NOCARE:	/* no consideration to ECN */
    107 		break;
    108 	}
    109 }
    110 
    111 #ifdef INET6
    112 void
    113 ip6_ecn_ingress(mode, outer, inner)
    114 	int mode;
    115 	u_int32_t *outer;
    116 	u_int32_t *inner;
    117 {
    118 	u_int8_t outer8, inner8;
    119 
    120 	if (!outer || !inner)
    121 		panic("NULL pointer passed to ip6_ecn_ingress");
    122 
    123 	outer8 = (ntohl(*outer) >> 20) & 0xff;
    124 	inner8 = (ntohl(*inner) >> 20) & 0xff;
    125 	ip_ecn_ingress(mode, &outer8, &inner8);
    126 	*outer &= ~htonl(0xff << 20);
    127 	*outer |= htonl((u_int32_t)outer8 << 20);
    128 }
    129 
    130 void
    131 ip6_ecn_egress(mode, outer, inner)
    132 	int mode;
    133 	u_int32_t *outer;
    134 	u_int32_t *inner;
    135 {
    136 	u_int8_t outer8, inner8;
    137 
    138 	if (!outer || !inner)
    139 		panic("NULL pointer passed to ip6_ecn_egress");
    140 
    141 	outer8 = (ntohl(*outer) >> 20) & 0xff;
    142 	inner8 = (ntohl(*inner) >> 20) & 0xff;
    143 	ip_ecn_egress(mode, &outer8, &inner8);
    144 	*inner &= ~htonl(0xff << 20);
    145 	*inner |= htonl((u_int32_t)inner8 << 20);
    146 }
    147 #endif
    148