/* * 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 *//* * Interface Control Message Protocol Definitions. * Per RFC 792, September 1981. *//* * 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 {			n_short	icd_id;			n_short	icd_seq;		} ih_idseq;		int ih_void;		/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */		struct ih_pmtu {			n_short ipm_void;    			n_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;		u_int	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)#ifdef KERNELvoid	icmp_error __P((struct mbuf *, int, int, n_int, struct ifnet *));void	icmp_input __P((struct mbuf *, int));void	icmp_reflect __P((struct mbuf *));void	icmp_send __P((struct mbuf *, struct mbuf *));int	icmp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));#endif