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//==========================================================================

//

//      src/sys/netinet/ip_ecn.c

//

//==========================================================================

// ####BSDCOPYRIGHTBEGIN####                                    

// -------------------------------------------                  

// This file is part of eCos, the Embedded Configurable Operating System.

//

// Portions of this software may have been derived from FreeBSD 

// or other sources, and if so are covered by the appropriate copyright

// and license included herein.                                 

//

// Portions created by the Free Software Foundation are         

// Copyright (C) 2002 Free Software Foundation, Inc.            

// -------------------------------------------                  

// ####BSDCOPYRIGHTEND####                                      

//==========================================================================

/*      $KAME: ip_ecn.c,v 1.11 2001/05/03 16:09:29 itojun Exp $ */

/*

 * Copyright (C) 1999 WIDE Project.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the project nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 */

/*

 * ECN consideration on tunnel ingress/egress operation.

 * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt

 */

#include <sys/param.h>

#include <sys/malloc.h>

#include <sys/mbuf.h>

#include <sys/errno.h>

#include <netinet/in.h>

#include <netinet/in_systm.h>

#include <netinet/ip.h>

#ifdef INET6

#include <netinet/ip6.h>

#endif

#include <netinet/ip_ecn.h>

/*

 * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).

 */

void

ip_ecn_ingress(mode, outer, inner)

        int mode;

        u_int8_t *outer;

        const u_int8_t *inner;

{

        if (!outer || !inner)

                panic("NULL pointer passed to ip_ecn_ingress");

        *outer = *inner;

        switch (mode) {

        case ECN_ALLOWED:               /* ECN allowed */

                *outer &= ~IPTOS_CE;

                break;

        case ECN_FORBIDDEN:             /* ECN forbidden */

                *outer &= ~(IPTOS_ECT | IPTOS_CE);

                break;

        case ECN_NOCARE:        /* no consideration to ECN */

                break;

        }

}

/*

 * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).

 */

void

ip_ecn_egress(mode, outer, inner)

        int mode;

        const u_int8_t *outer;

        u_int8_t *inner;

{

        if (!outer || !inner)

                panic("NULL pointer passed to ip_ecn_egress");

        switch (mode) {

        case ECN_ALLOWED:

                if (*outer & IPTOS_CE)

                        *inner |= IPTOS_CE;

                break;

        case ECN_FORBIDDEN:             /* ECN forbidden */

        case ECN_NOCARE:        /* no consideration to ECN */

                break;

        }

}

#ifdef INET6

void

ip6_ecn_ingress(mode, outer, inner)

        int mode;

        u_int32_t *outer;

        const u_int32_t *inner;

{

        u_int8_t outer8, inner8;

        if (!outer || !inner)

                panic("NULL pointer passed to ip6_ecn_ingress");

        inner8 = (ntohl(*inner) >> 20) & 0xff;

        ip_ecn_ingress(mode, &outer8, &inner8);

        *outer &= ~htonl(0xff << 20);

        *outer |= htonl((u_int32_t)outer8 << 20);

}

void

ip6_ecn_egress(mode, outer, inner)

        int mode;

        const u_int32_t *outer;

        u_int32_t *inner;

{

        u_int8_t outer8, inner8;

        if (!outer || !inner)

                panic("NULL pointer passed to ip6_ecn_egress");

        outer8 = (ntohl(*outer) >> 20) & 0xff;

        ip_ecn_egress(mode, &outer8, &inner8);

        *inner &= ~htonl(0xff << 20);

        *inner |= htonl((u_int32_t)inner8 << 20);

}

#endif