/*

 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#ifndef ICMP_H

#define ICMP_H

/*

 * Structure of an internet header, naked of options.

 *

 * We declare ip_len and ip_off to be short, rather than ushort_t

 * pragmatically since otherwise unsigned comparisons can result

 * against negative integers quite easily, and fail in subtle ways.

 */

struct ip {

        unsigned char   ip_hl:4,        /* header length */

                        ip_v:4;         /* version */

        unsigned char   ip_tos;                 /* type of service */

        short   ip_len;                 /* total length */

        unsigned short ip_id;                   /* identification */

        short   ip_off;                 /* fragment offset field */

#define IP_MF 0x2000                    /* more fragments flag */

        unsigned char   ip_ttl;                 /* time to live */

        unsigned char   ip_p;                   /* protocol */

        unsigned short ip_sum;          /* checksum */

        struct  in_addr ip_src, ip_dst; /* source and dest address */

};

/*

 * Structure of an icmp header.

 */

struct icmp {

        unsigned char   icmp_type;              /* type of message, see below */

        unsigned char   icmp_code;              /* type sub code */

        unsigned short icmp_cksum;              /* ones complement cksum of struct */

        union {

                unsigned char ih_pptr;          /* ICMP_PARAMPROB */

                struct in_addr ih_gwaddr;       /* ICMP_REDIRECT */

                struct ih_idseq {

                        unsigned short icd_id;

                        unsigned short icd_seq;

                } ih_idseq;

                int ih_void;

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

                struct ih_pmtu {

                        unsigned short ipm_void;

                        unsigned short ipm_nextmtu;

                } ih_pmtu;

                struct ih_rtradv {

                        unsigned char irt_num_addrs;

                        unsigned char irt_wpa;

                        unsigned short 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

        union {

                struct id_ts {

                        unsigned int its_otime;

                        unsigned int its_rtime;

                        unsigned int its_ttime;

                } id_ts;

                struct id_ip  {

                        struct ip idi_ip;

                        /* options and then 64 bits of data */

                } id_ip;

                unsigned int 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

};

#define ICMP_ECHOREPLY          0               /* echo reply */

#define ICMP_ECHO               8               /* echo service */

/*

 * ICMPv6 structures & constants

 */

typedef struct icmp6_hdr {

        u_char   icmp6_type;    /* type field */

        u_char   icmp6_code;    /* code field */

        u_short  icmp6_cksum;   /* checksum field */

        union {

                u_int icmp6_un_data32[1];       /* type-specific field */

                u_short icmp6_un_data16[2];     /* type-specific field */

                u_char  icmp6_un_data8[4];      /* type-specific field */

        } icmp6_dataun;

} icmp6_t;

#define icmp6_data32    icmp6_dataun.icmp6_un_data32

#define icmp6_data16    icmp6_dataun.icmp6_un_data16

#define icmp6_data8     icmp6_dataun.icmp6_un_data8

#define icmp6_pptr      icmp6_data32[0] /* parameter prob */

#define icmp6_mtu       icmp6_data32[0] /* packet too big */

#define icmp6_id        icmp6_data16[0] /* echo request/reply */

#define icmp6_seq       icmp6_data16[1] /* echo request/reply */

#define icmp6_maxdelay  icmp6_data16[0] /* mcast group membership */

struct ip6_pseudo_hdr  /* for calculate the ICMPv6 checksum */

{

  struct in6_addr ip6_src;

  struct in6_addr ip6_dst;

  u_int       ip6_plen;

  u_int       ip6_nxt;

};

#define ICMP6_ECHO_REQUEST      128

#define ICMP6_ECHO_REPLY        129

#define IPPROTO_ICMPV6          58

#define IPV6_UNICAST_HOPS       4  /* Set/get IP unicast hop limit */

#endif