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Filename : ip_icmp.h
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/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef __NETINET_IP_ICMP_H
#define __NETINET_IP_ICMP_H    1

#include <sys/types.h>
#include <stdint.h>

__BEGIN_DECLS

struct icmphdr
{
  uint8_t type;		/* message type */
  uint8_t code;		/* type sub-code */
  uint16_t checksum;
  union
  {
    struct
    {
      uint16_t	id;
      uint16_t	sequence;
    } echo;			/* echo datagram */
    uint32_t	gateway;	/* gateway address */
    struct
    {
      uint16_t	__glibc_reserved;
      uint16_t	mtu;
    } frag;			/* path mtu discovery */
  } un;
};

#define ICMP_ECHOREPLY		0	/* Echo Reply			*/
#define ICMP_DEST_UNREACH	3	/* Destination Unreachable	*/
#define ICMP_SOURCE_QUENCH	4	/* Source Quench		*/
#define ICMP_REDIRECT		5	/* Redirect (change route)	*/
#define ICMP_ECHO		8	/* Echo Request			*/
#define ICMP_TIME_EXCEEDED	11	/* Time Exceeded		*/
#define ICMP_PARAMETERPROB	12	/* Parameter Problem		*/
#define ICMP_TIMESTAMP		13	/* Timestamp Request		*/
#define ICMP_TIMESTAMPREPLY	14	/* Timestamp Reply		*/
#define ICMP_INFO_REQUEST	15	/* Information Request		*/
#define ICMP_INFO_REPLY		16	/* Information Reply		*/
#define ICMP_ADDRESS		17	/* Address Mask Request		*/
#define ICMP_ADDRESSREPLY	18	/* Address Mask Reply		*/
#define NR_ICMP_TYPES		18


/* Codes for UNREACH. */
#define ICMP_NET_UNREACH	0	/* Network Unreachable		*/
#define ICMP_HOST_UNREACH	1	/* Host Unreachable		*/
#define ICMP_PROT_UNREACH	2	/* Protocol Unreachable		*/
#define ICMP_PORT_UNREACH	3	/* Port Unreachable		*/
#define ICMP_FRAG_NEEDED	4	/* Fragmentation Needed/DF set	*/
#define ICMP_SR_FAILED		5	/* Source Route failed		*/
#define ICMP_NET_UNKNOWN	6
#define ICMP_HOST_UNKNOWN	7
#define ICMP_HOST_ISOLATED	8
#define ICMP_NET_ANO		9
#define ICMP_HOST_ANO		10
#define ICMP_NET_UNR_TOS	11
#define ICMP_HOST_UNR_TOS	12
#define ICMP_PKT_FILTERED	13	/* Packet filtered */
#define ICMP_PREC_VIOLATION	14	/* Precedence violation */
#define ICMP_PREC_CUTOFF	15	/* Precedence cut off */
#define NR_ICMP_UNREACH		15	/* instead of hardcoding immediate value */

/* Codes for REDIRECT. */
#define ICMP_REDIR_NET		0	/* Redirect Net			*/
#define ICMP_REDIR_HOST		1	/* Redirect Host		*/
#define ICMP_REDIR_NETTOS	2	/* Redirect Net for TOS		*/
#define ICMP_REDIR_HOSTTOS	3	/* Redirect Host for TOS	*/

/* Codes for TIME_EXCEEDED. */
#define ICMP_EXC_TTL		0	/* TTL count exceeded		*/
#define ICMP_EXC_FRAGTIME	1	/* Fragment Reass time exceeded	*/

/* Codes for ICMP_EXT_ECHO (PROBE) */
#define ICMP_EXT_ECHO		42
#define ICMP_EXT_ECHOREPLY	43
#define ICMP_EXT_CODE_MAL_QUERY	1	/* Malformed Query */
#define ICMP_EXT_CODE_NO_IF	2	/* No such Interface */
#define ICMP_EXT_CODE_NO_TABLE_ENT	3	/* No table entry */
#define ICMP_EXT_CODE_MULT_IFS	4	/* Multiple Interfaces Satisfy Query */

/* Constants for EXT_ECHO (PROBE) */
#define ICMP_EXT_ECHOREPLY_ACTIVE	(1 << 2)/* active bit in reply */
#define ICMP_EXT_ECHOREPLY_IPV4		(1 << 1)/* ipv4 bit in reply */
#define ICMP_EXT_ECHOREPLY_IPV6		1	/* ipv6 bit in reply */
#define ICMP_EXT_ECHO_CTYPE_NAME	1
#define ICMP_EXT_ECHO_CTYPE_INDEX	2
#define ICMP_EXT_ECHO_CTYPE_ADDR	3
#define ICMP_AFI_IP			1	/* Address Family Identifier for IPV4 */
#define ICMP_AFI_IP6			2	/* Address Family Identifier for IPV6 */


#ifdef __USE_MISC
/*
 * 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
 */

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

/*
 * Internal of an ICMP Router Advertisement
 */
struct icmp_ra_addr
{
  uint32_t ira_addr;
  uint32_t ira_preference;
};

struct icmp
{
  uint8_t  icmp_type;	/* type of message, see below */
  uint8_t  icmp_code;	/* type sub code */
  uint16_t icmp_cksum;	/* ones complement checksum of struct */
  union
  {
    unsigned char ih_pptr;	/* ICMP_PARAMPROB */
    struct in_addr ih_gwaddr;	/* gateway address */
    struct ih_idseq		/* echo datagram */
    {
      uint16_t icd_id;
      uint16_t icd_seq;
    } ih_idseq;
    uint32_t ih_void;

    /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
    struct ih_pmtu
    {
      uint16_t ipm_void;
      uint16_t ipm_nextmtu;
    } ih_pmtu;

    struct ih_rtradv
    {
      uint8_t irt_num_addrs;
      uint8_t irt_wpa;
      uint16_t irt_lifetime;
    } ih_rtradv;
  } 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
#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
  union
  {
    struct
    {
      uint32_t its_otime;
      uint32_t its_rtime;
      uint32_t its_ttime;
    } id_ts;
    struct
    {
      struct ip idi_ip;
      /* options and then 64 bits of data */
    } id_ip;
    struct icmp_ra_addr id_radv;
    uint32_t   id_mask;
    uint8_t    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_radv	icmp_dun.id_radv
#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 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 */
#ifndef _IP_VHL
#define	ICMP_ADVLEN(p)	(8 + ((p)->icmp_ip.ip_hl << 2) + 8)
	/* N.B.: must separately check that ip_hl >= 5 */
#else
#define	ICMP_ADVLEN(p)	(8 + (IP_VHL_HL((p)->icmp_ip.ip_vhl) << 2) + 8)
	/* N.B.: must separately check that header length >= 5 */
#endif

/* Definition of type and code fields. */
/* defined above: ICMP_ECHOREPLY, ICMP_REDIRECT, ICMP_ECHO */
#define	ICMP_UNREACH		3		/* dest unreachable, codes: */
#define	ICMP_SOURCEQUENCH	4		/* packet lost, slow down */
#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_MAXTYPE		18

/* UNREACH 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	/* net denied */
#define	ICMP_UNREACH_HOST_PROHIB        10	/* host denied */
#define	ICMP_UNREACH_TOSNET	        11	/* bad tos for net */
#define	ICMP_UNREACH_TOSHOST	        12	/* bad tos for host */
#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 */

/* REDIRECT 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 */

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

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

#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 /* __USE_MISC */

__END_DECLS

#endif /* netinet/ip_icmp.h */