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ip_icmp.h

/* 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 */

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