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ip_icmp.h

/*
 * 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
 * $FreeBSD: src/sys/netinet/ip_icmp.h,v 1.13 1999/08/28 00:49:24 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
 */
00044 struct icmp_ra_addr {
      u_int32_t ira_addr;
      u_int32_t ira_preference;
};

/*
 * Structure of an icmp header.
 */
00052 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
};

/*
 * 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_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)

#ifdef KERNEL
void  icmp_error __P((struct mbuf *, int, int, n_long, struct ifnet *));
void  icmp_input __P((struct mbuf *, int));
#endif

#endif

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