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/* Copyright (C) 1991, 92, 93, 95, 96, 97, 99 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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#ifndef __NETINET_IP_ICMP_H

#define __NETINET_IP_ICMP_H    1

#include <sys/cdefs.h>

#include <sys/types.h>

__BEGIN_DECLS

struct icmphdr

{

  u_int8_t type;                /* message type */

  u_int8_t code;                /* type sub-code */

  u_int16_t checksum;

  union

  {

    struct

    {

      u_int16_t id;

      u_int16_t sequence;

    } echo;                     /* echo datagram */

    u_int32_t   gateway;        /* gateway address */

    struct

    {

      u_int16_t __unused;

      u_int16_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 */

#ifdef __USE_BSD

/*

 * 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

{

  u_int32_t ira_addr;

  u_int32_t ira_preference;

};

struct icmp

{

  u_int8_t  icmp_type;  /* type of message, see below */

  u_int8_t  icmp_code;  /* type sub code */

  u_int16_t icmp_cksum; /* ones complement checksum of struct */

  union

  {

    u_char ih_pptr;             /* ICMP_PARAMPROB */

    struct in_addr ih_gwaddr;   /* gateway address */

    struct ih_idseq             /* echo datagram */

    {

      u_int16_t icd_id;

      u_int16_t icd_seq;

    } ih_idseq;

    u_int32_t ih_void;

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

    struct ih_pmtu

    {

      u_int16_t ipm_void;

      u_int16_t ipm_nextmtu;

    } ih_pmtu;

    struct ih_rtradv

    {

      u_int8_t irt_num_addrs;

      u_int8_t irt_wpa;

      u_int16_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

    {

      u_int32_t its_otime;

      u_int32_t its_rtime;

      u_int32_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;

    u_int32_t   id_mask;

    u_int8_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_BSD */

__END_DECLS

#endif /* netinet/ip_icmp.h */