/** $Id: ip_icmp.h 1551 2004-10-09 08:46:16Z bird $ */
/** @file
 * FreeBSD 5.2
 *
 * @changed bird (2003): modified for gcc/os2
 * @changed bird (2004): updated to FreeBSD 5.2 and __USE_LIBC_TCPIP
 */

/*
 * 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.
 * 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
 * $FreeBSD: src/sys/netinet/ip_icmp.h,v 1.22 2004/04/07 20:46:13 imp Exp $
 */

#ifndef _NETINET_IP_ICMP_H_
#define _NETINET_IP_ICMP_H_

/*
 * Interface Control Message Protocol Definitions.
 * Per RFC 792, September 1981.
 */

#ifdef __USE_LIBC_TCPIP
/*
 * Internal of an ICMP Router Advertisement
 */
struct icmp_ra_addr {
	u_int32_t ira_addr;
	u_int32_t ira_preference;
};
#endif

/*
 * Structure of an icmp header.
 */
#pragma pack(1)
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 {
			n_short	icd_id;
			n_short	icd_seq;
		} ih_idseq;
		int ih_void;

#if !defined(TCPV40HDRS) || defined(__USE_LIBC_TCPIP)
                /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
                struct ih_pmtu {
                        n_short ipm_void;
                        n_short ipm_nextmtu;
                } ih_pmtu;

#ifdef __USE_LIBC_TCPIP
		struct ih_rtradv {
			u_char irt_num_addrs;
			u_char irt_wpa;
			u_int16_t irt_lifetime;
		} ih_rtradv;
#endif
#endif
	} 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
#if !defined(TCPV40HDRS) || defined(__USE_LIBC_TCPIP)
#define icmp_pmvoid     icmp_hun.ih_pmtu.ipm_void
#define icmp_nextmtu    icmp_hun.ih_pmtu.ipm_nextmtu
#ifdef __USE_LIBC_TCPIP
#define	icmp_num_addrs	icmp_hun.ih_rtradv.irt_num_addrs
#define	icmp_wpa	icmp_hun.ih_rtradv.irt_wpa
#define	icmp_lifetime	icmp_hun.ih_rtradv.irt_lifetime
#endif
#endif
	union {
		struct id_ts {			/* ICMP Timestamp */
			n_time its_otime;	/* Originate */
			n_time its_rtime;	/* Receive */
			n_time its_ttime;	/* Transmit */
		} id_ts;
		struct id_ip  {
			struct ip idi_ip;
			/* options and then 64 bits of data */
		} id_ip;
#ifdef __USE_LIBC_TCPIP
		struct icmp_ra_addr id_radv;
		u_int32_t id_mask;
#else
		u_long	id_mask;
#endif
		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
#ifdef __USE_LIBC_TCPIP
#define	icmp_radv	icmp_dun.id_radv
#endif
#define	icmp_mask	icmp_dun.id_mask
#define	icmp_data	icmp_dun.id_data
};
#pragma pack()

/*
 * Lower bounds on packet lengths for various types.
 * For the error advice packets must first insure that the
 * packet is large enough 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 */
#if !defined(TCPV40HDRS) || defined(__USE_LIBC_TCPIP)
#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 */
#ifdef __USE_LIBC_TCPIP
#define		ICMP_UNREACH_FILTER_PROHIB 13		/* admin prohib */
#define		ICMP_UNREACH_HOST_PRECEDENCE 14		/* host prec vio. */
#define		ICMP_UNREACH_PRECEDENCE_CUTOFF 15	/* prec cutoff */
#endif
#endif
#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 */
#ifdef __USE_LIBC_TCPIP
#define	ICMP_ALTHOSTADDR	6		/* alternate host address */
#endif
#define	ICMP_ECHO		8		/* echo service */
#if !defined(TCPV40HDRS) || defined(__USE_LIBC_TCPIP)
#define ICMP_ROUTERADVERT       9               /* router advertisement */
#ifdef __USE_LIBC_TCPIP
#define		ICMP_ROUTERADVERT_NORMAL		0	/* normal advertisement */
#define		ICMP_ROUTERADVERT_NOROUTE_COMMON	16	/* selective routing */
#endif
#define ICMP_ROUTERSOLICIT      10              /* router solicitation */
#endif
#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 */
#if !defined(TCPV40HDRS) || defined(__USE_LIBC_TCPIP)
#ifdef __USE_LIBC_TCPIP
#define		ICMP_PARAMPROB_ERRATPTR 0		/* error at param ptr */
#endif
#define         ICMP_PARAMPROB_OPTABSENT 1              /* req. opt. absent */
#ifdef __USE_LIBC_TCPIP
#define		ICMP_PARAMPROB_LENGTH 2			/* bad length */
#endif
#endif
#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 */
#ifdef __USE_LIBC_TCPIP
#define	ICMP_TRACEROUTE		30		/* traceroute */
#define	ICMP_DATACONVERR	31		/* data conversion error */
#define	ICMP_MOBILE_REDIRECT	32		/* mobile host redirect */
#define	ICMP_IPV6_WHEREAREYOU	33		/* IPv6 where-are-you */
#define	ICMP_IPV6_IAMHERE	34		/* IPv6 i-am-here */
#define	ICMP_MOBILE_REGREQUEST	35		/* mobile registration req */
#define	ICMP_MOBILE_REGREPLY	36		/* mobile registration reply */
#define	ICMP_SKIP		39		/* SKIP */
#define	ICMP_PHOTURIS		40		/* Photuris */
#define		ICMP_PHOTURIS_UNKNOWN_INDEX	1	/* unknown sec index */
#define		ICMP_PHOTURIS_AUTH_FAILED	2	/* auth failed */
#define		ICMP_PHOTURIS_DECRYPT_FAILED	3	/* decrypt failed */
#endif

#ifdef __USE_LIBC_TCPIP
#define	ICMP_MAXTYPE		40
#else
#define	ICMP_MAXTYPE		18
#endif

#ifndef TCPV40HDRS
#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)
#else
#define	ICMP_INFOTYPE(type) \
	((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
	(type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
	(type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
	(type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
#endif

#ifdef _KERNEL
void	icmp_error(struct mbuf *, int, int, n_long, struct ifnet *);
void	icmp_input(struct mbuf *, int);
#endif

#ifdef TCPV40HDRS
#pragma pack(1)
struct  icmpstat {
/* statistics related to icmp packets generated */
	short	icps_error;
	short	icps_oldshort;
	short	icps_oldicmp;
	short	icps_outhist[ICMP_MAXTYPE + 1];
/* statistics related to input messages processed */
	short	icps_badcode;
	short	icps_tooshort;
	short	icps_checksum;
	short	icps_badlen;
	short	icps_reflect;
	short	icps_inhist[ICMP_MAXTYPE + 1];
	u_long	icps_OutMsgs;
	u_long	icps_OutErrors;
	u_long	icps_InMsgs;
	u_long	icps_InDestUnreachs;
	u_long	icps_InTimeExcds;
	u_long	icps_InParmProbs;
	u_long	icps_InSrcQuenchs;
	u_long	icps_InRedirects;
	u_long	icps_InEchos;
	u_long	icps_InEchoReps;
	u_long	icps_InTimestamps;
	u_long	icps_InTimestampReps;
	u_long	icps_InAddrMasks;
	u_long	icps_InAddrMaskReps;
	u_long	icps_OutDestUnreachs;
	u_long	icps_OutTimeExcds;
	u_long	icps_OutParmProbs;
	u_long	icps_OutSrcQuenchs;
	u_long	icps_OutRedirects;
	u_long	icps_OutEchos;
	u_long	icps_OutEchoReps;
	u_long	icps_OutTimestamps;
	u_long	icps_OutTimestampReps;
	u_long	icps_OutAddrMasks;
	u_long	icps_OutAddrMaskReps;
};
#pragma pack()
#endif

#endif /* !_NETINET_IP_ICMP_H_ */
