/*

 * Copyright (c) 1982, 1986, 1993

 *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *	This product includes software developed by the University of

 *	California, Berkeley and its contributors.

 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.

 *

 *	@(#)ip_icmp.h	8.1 (Berkeley) 6/10/93

 * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp

 */

#ifndef _NETINET_IP_ICMP_H_

#define _NETINET_IP_ICMP_H_

/*

 * Interface Control Message Protocol Definitions.

 * Per RFC 792, September 1981.

 */

typedef u_int32_t n_time;

/*

 * Structure of an icmp header.

 */

struct icmp {

	u_char	icmp_type;		/* type of message, see below */

	u_char	icmp_code;		/* type sub code */

	u_short	icmp_cksum;		/* ones complement cksum of struct */

	union {

		u_char ih_pptr;			/* ICMP_PARAMPROB */

		struct in_addr ih_gwaddr;	/* ICMP_REDIRECT */

		struct ih_idseq {

			u_short	icd_id;

			u_short	icd_seq;

		} ih_idseq;

		int ih_void;

		/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */

		struct ih_pmtu {

			u_short ipm_void;

			u_short ipm_nextmtu;

		} ih_pmtu;

	} icmp_hun;

#define	icmp_pptr	icmp_hun.ih_pptr

#define	icmp_gwaddr	icmp_hun.ih_gwaddr

#define	icmp_id		icmp_hun.ih_idseq.icd_id

#define	icmp_seq	icmp_hun.ih_idseq.icd_seq

#define	icmp_void	icmp_hun.ih_void

#define	icmp_pmvoid	icmp_hun.ih_pmtu.ipm_void

#define	icmp_nextmtu	icmp_hun.ih_pmtu.ipm_nextmtu

	union {

		struct id_ts {

			n_time its_otime;

			n_time its_rtime;

			n_time its_ttime;

		} id_ts;

		struct id_ip  {

			struct ip idi_ip;

			/* options and then 64 bits of data */

		} id_ip;

		uint32_t	id_mask;

		char		id_data[1];

	} icmp_dun;

#define	icmp_otime	icmp_dun.id_ts.its_otime

#define	icmp_rtime	icmp_dun.id_ts.its_rtime

#define	icmp_ttime	icmp_dun.id_ts.its_ttime

#define	icmp_ip		icmp_dun.id_ip.idi_ip

#define	icmp_mask	icmp_dun.id_mask

#define	icmp_data	icmp_dun.id_data

};

/*

 * Lower bounds on packet lengths for various types.

 * For the error advice packets must first insure that the

 * packet is large enought to contain the returned ip header.

 * Only then can we do the check to see if 64 bits of packet

 * data have been returned, since we need to check the returned

 * ip header length.

 */

#define	ICMP_MINLEN	8				/* abs minimum */

#define	ICMP_TSLEN	(8 + 3 * sizeof (n_time))	/* timestamp */

#define	ICMP_MASKLEN	12				/* address mask */

#define	ICMP_ADVLENMIN	(8 + sizeof (struct ip) + 8)	/* min */

#define	ICMP_ADVLEN(p)	(8 + ((p)->icmp_ip.ip_hl << 2) + 8)

	/* N.B.: must separately check that ip_hl >= 5 */

/*

 * Definition of type and code field values.

 */

#define	ICMP_ECHOREPLY		0		/* echo reply */

#define	ICMP_UNREACH		3		/* dest unreachable, codes: */

#define		ICMP_UNREACH_NET	0		/* bad net */

#define		ICMP_UNREACH_HOST	1		/* bad host */

#define		ICMP_UNREACH_PROTOCOL	2		/* bad protocol */

#define		ICMP_UNREACH_PORT	3		/* bad port */

#define		ICMP_UNREACH_NEEDFRAG	4		/* IP_DF caused drop */

#define		ICMP_UNREACH_SRCFAIL	5		/* src route failed */

#define		ICMP_UNREACH_NET_UNKNOWN 6		/* unknown net */

#define		ICMP_UNREACH_HOST_UNKNOWN 7		/* unknown host */

#define		ICMP_UNREACH_ISOLATED	8		/* src host isolated */

#define		ICMP_UNREACH_NET_PROHIB	9		/* prohibited access */

#define		ICMP_UNREACH_HOST_PROHIB 10		/* ditto */

#define		ICMP_UNREACH_TOSNET	11		/* bad tos for net */

#define		ICMP_UNREACH_TOSHOST	12		/* bad tos for host */

#define	ICMP_SOURCEQUENCH	4		/* packet lost, slow down */

#define	ICMP_REDIRECT		5		/* shorter route, codes: */

#define		ICMP_REDIRECT_NET	0		/* for network */

#define		ICMP_REDIRECT_HOST	1		/* for host */

#define		ICMP_REDIRECT_TOSNET	2		/* for tos and net */

#define		ICMP_REDIRECT_TOSHOST	3		/* for tos and host */

#define	ICMP_ECHO		8		/* echo service */

#define	ICMP_ROUTERADVERT	9		/* router advertisement */

#define	ICMP_ROUTERSOLICIT	10		/* router solicitation */

#define	ICMP_TIMXCEED		11		/* time exceeded, code: */

#define		ICMP_TIMXCEED_INTRANS	0		/* ttl==0 in transit */

#define		ICMP_TIMXCEED_REASS	1		/* ttl==0 in reass */

#define	ICMP_PARAMPROB		12		/* ip header bad */

#define		ICMP_PARAMPROB_OPTABSENT 1		/* req. opt. absent */

#define	ICMP_TSTAMP		13		/* timestamp request */

#define	ICMP_TSTAMPREPLY	14		/* timestamp reply */

#define	ICMP_IREQ		15		/* information request */

#define	ICMP_IREQREPLY		16		/* information reply */

#define	ICMP_MASKREQ		17		/* address mask request */

#define	ICMP_MASKREPLY		18		/* address mask reply */

#define	ICMP_MAXTYPE		18

#define	ICMP_INFOTYPE(type) \

	((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \

	(type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \

	(type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \

	(type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \

	(type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)

void icmp_input _P((struct mbuf *, int));

void icmp_error(struct mbuf *msrc, u_char type, u_char code, int minsize,

                const char *message);

void icmp_reflect _P((struct mbuf *));

#endif