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/*

 * 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. 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

 * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp

 */

#ifndef _NETINET_IP_ICMP_H_

#define _NETINET_IP_ICMP_H_

/*

 * Interface Control Message Protocol Definitions.

 * Per RFC 792, September 1981.

 */

typedef uint32_t n_time;

/*

 * 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 {

                        u_short        icd_id;

                        u_short        icd_seq;

                } ih_idseq;

                int ih_void;

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

                struct ih_pmtu {

                        u_short ipm_void;

                        u_short ipm_nextmtu;

                } ih_pmtu;

        } 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

        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;

                uint32_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_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 enought 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 */

#define        ICMP_ADVLEN(p)        (8 + ((p)->icmp_ip.ip_hl << 2) + 8)

        /* N.B.: must separately check that ip_hl >= 5 */

/*

 * 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_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_OPTABSENT 1                /* req. opt. absent */

#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)

void icmp_input(struct mbuf *, int);

void icmp_error(struct mbuf *msrc, u_char type, u_char code, int minsize,

                const char *message);

void icmp_reflect(struct mbuf *);

#endif