/*	$OpenBSD: ip_ecn.h,v 1.7 2018/11/14 23:55:04 dlg Exp $	*/
/*	$KAME: ip_ecn.h,v 1.5 2000/03/27 04:58:38 sumikawa 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.
 *
 */

#ifndef _NETINET_IP_ECN_H_
#define _NETINET_IP_ECN_H_

/*
 * ECN consideration on tunnel ingress/egress operation.
 * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt
 */

#define ECN_ALLOWED_IPSEC	2	/* ECN allowed */
#define ECN_ALLOWED		1	/* ECN allowed */
#define ECN_FORBIDDEN		0	/* ECN forbidden */
#define ECN_NOCARE		(-1)	/* no consideration to ECN */

#if defined(_KERNEL)
extern void ip_ecn_ingress(int, u_int8_t *, u_int8_t *);
extern int ip_ecn_egress(int, u_int8_t *, u_int8_t *);
void ip_tos_patch(struct ip *, uint8_t);
#endif /* _KERNEL */
#endif /* _NETINET_IP_ECN_H_ */