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ip_ecn.c revision 1.1.2.2 
      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  * KAME Id: ip_ecn.c,v 1.2 1999/07/30 12:17:15 itojun 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 <netinet/ip6.h>
     57 #endif
     58 
     59 #include <netinet/ip_ecn.h>
     60 
     61 /*
     62  * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
     63  * call it after you've done the default initialization/copy for the outer.
     64  */
     65 void
     66 ip_ecn_ingress(mode, outer, inner)
     67 	int mode;
     68 	u_int8_t *outer;
     69 	u_int8_t *inner;
     70 {
     71 	if (!outer || !inner)
     72 		panic("NULL pointer passed to ip_ecn_ingress");
     73 
     74 	switch (mode) {
     75 	case ECN_ALLOWED:		/* ECN allowed */
     76 		*outer &= ~IPTOS_CE;
     77 		break;
     78 	case ECN_FORBIDDEN:		/* ECN forbidden */
     79 		*outer &= ~(IPTOS_ECT | IPTOS_CE);
     80 		break;
     81 	case ECN_NOCARE:	/* no consideration to ECN */
     82 		break;
     83 	}
     84 }
     85 
     86 /*
     87  * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
     88  * call it after you've done the default initialization/copy for the inner.
     89  */
     90 void
     91 ip_ecn_egress(mode, outer, inner)
     92 	int mode;
     93 	u_int8_t *outer;
     94 	u_int8_t *inner;
     95 {
     96 	if (!outer || !inner)
     97 		panic("NULL pointer passed to ip_ecn_egress");
     98 
     99 	switch (mode) {
    100 	case ECN_ALLOWED:
    101 		if (*outer & IPTOS_CE)
    102 			*inner |= IPTOS_CE;
    103 		break;
    104 	case ECN_FORBIDDEN:		/* ECN forbidden */
    105 	case ECN_NOCARE:	/* no consideration to ECN */
    106 		break;
    107 	}
    108 }
    109 
    110 #ifdef INET6
    111 void
    112 ip6_ecn_ingress(mode, outer, inner)
    113 	int mode;
    114 	u_int32_t *outer;
    115 	u_int32_t *inner;
    116 {
    117 	u_int8_t outer8, inner8;
    118 
    119 	if (!outer || !inner)
    120 		panic("NULL pointer passed to ip6_ecn_ingress");
    121 
    122 	outer8 = (ntohl(*outer) >> 20) & 0xff;
    123 	inner8 = (ntohl(*inner) >> 20) & 0xff;
    124 	ip_ecn_ingress(mode, &outer8, &inner8);
    125 	*outer &= ~htonl(0xff << 20);
    126 	*outer |= htonl((u_int32_t)outer8 << 20);
    127 }
    128 
    129 void
    130 ip6_ecn_egress(mode, outer, inner)
    131 	int mode;
    132 	u_int32_t *outer;
    133 	u_int32_t *inner;
    134 {
    135 	u_int8_t outer8, inner8;
    136 
    137 	if (!outer || !inner)
    138 		panic("NULL pointer passed to ip6_ecn_egress");
    139 
    140 	outer8 = (ntohl(*outer) >> 20) & 0xff;
    141 	inner8 = (ntohl(*inner) >> 20) & 0xff;
    142 	ip_ecn_egress(mode, &outer8, &inner8);
    143 	*inner &= ~htonl(0xff << 20);
    144 	*inner |= htonl((u_int32_t)inner8 << 20);
    145 }
    146 #endif
    147