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//==========================================================================

//

//      include/netinet/ip_icmp.h

//

//==========================================================================

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//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD, 

// FreeBSD or other sources, and are covered by the appropriate

// copyright disclaimers included herein.

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// Portions created by Red Hat are

// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.

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//####BSDCOPYRIGHTEND####

//==========================================================================

/*

 * 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

 * $FreeBSD: src/sys/netinet/ip_icmp.h,v 1.16 1999/12/29 04:41:01 peter Exp $

 */

#ifndef _NETINET_IP_ICMP_H_

#define _NETINET_IP_ICMP_H_

/*

 * Interface Control Message Protocol Definitions.

 * Per RFC 792, September 1981.

 */

/*

 * Internal of an ICMP Router Advertisement

 */

struct icmp_ra_addr {

        u_int32_t ira_addr;

        u_int32_t ira_preference;

};

/*

 * 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;

                struct ih_rtradv {

                        u_char irt_num_addrs;

                        u_char 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 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;

                struct icmp_ra_addr id_radv;

                u_int32_t 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_radv       icmp_dun.id_radv

#define icmp_mask       icmp_dun.id_mask

#define icmp_data       icmp_dun.id_data

} __attribute__ ((aligned(1), packed));

/*

 * 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 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_UNREACH_FILTER_PROHIB 13           /* admin prohib */

#define         ICMP_UNREACH_HOST_PRECEDENCE 14         /* host prec vio. */

#define         ICMP_UNREACH_PRECEDENCE_CUTOFF 15       /* prec cutoff */

#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_ERRATPTR 0               /* error at param ptr */

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

#define         ICMP_PARAMPROB_LENGTH 2                 /* bad length */

#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 _KERNEL

void    icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *));

void    icmp_input __P((struct mbuf *, int));

#endif

#endif