/* Parts of this file are covered under the following copyright */
/*
 * 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
 */
 
#ifndef NETINET_IP_ICMP_H
#define NETINET_IP_ICMP_H

#include <endian.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <stdint.h>

struct icmp {
	uint8_t icmp_type;
	uint8_t icmp_code;
	uint16_t icmp_cksum;
	union {
		uint8_t ih_pptr;
		struct in_addr ih_gwaddr;
		struct ih_idseq {
			uint16_t icd_id;
			uint16_t icd_seq;
		} ih_idseq;
		int32_t ih_void;
		
		/* ICMP_UNREACH_NEEDFRAG (RFC 1191) */
		struct ih_pmtu {
			uint16_t ipm_void;
			uint16_t ipm_nextmtu;
		} ih_pmtu;
	} icmp_hun;
	union {
		struct id_ts {
			uint32_t its_otime;
			uint32_t its_rtime;
			uint32_t its_ttime;
		} id_ts;
		struct id_ip {
			struct ip idi_ip;
		} id_ip;
		uint32_t id_mask;
		char id_data[1];
	} icmp_dun;
};

#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

#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 

#define ICMP_MINLEN                        8 /* absolute minimum length */
#define ICMP_ADVLENMIN (8 + sizeof(struct ip) + 8)
#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)

/* Definition of type and code field values.
 *http://www.iana.org/assignments/icmp-parameters
 */
#define   ICMP_ECHOREPLY                   0/* echo reply */
#define   ICMP_UNREACH                     3/* dest unreachable, codes: */
#define   ICMP_SOURCEQUENCH                4/* packet lost, slow down */
#define   ICMP_REDIRECT                    5/* shorter route, codes: */
#define   ICMP_ALTHOSTADDR                 6/* alternate host address */  
#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_PARAMPROB                  12/* ip header bad */
#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_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_MAXTYPE                    40

#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/* for crypto devs */
#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_UNREACH_FILTER_PROHIB      13/* prohibited access */
#define   ICMP_UNREACH_HOST_PRECEDENCE    14/* precedence violat'n*/
#define   ICMP_UNREACH_PRECEDENCE_CUTOFF  15/* precedence cutoff */

#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_ROUTERADVERT_NORMAL         0/* normal advertisement */
#define   ICMP_ROUTERADVERT_NOROUTE_COMMON16/* selective routing */

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

#define   ICMP_PARAMPROB_ERRATPTR          0/* req. opt. absent */
#define   ICMP_PARAMPROB_OPTABSENT         1/* req. opt. absent */
#define   ICMP_PARAMPROB_LENGTH            2/* bad length */

#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 */ 


#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)   

#endif /* NETINET_IP_ICMP_H */