FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_icmp.h

     /*      $OpenBSD: ip_icmp.h,v 1.32 2020/12/20 21:15:47 bluhm Exp $      */
     /*      $NetBSD: ip_icmp.h,v 1.10 1996/02/13 23:42:28 christos Exp $    */
     
     /*
      * 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
     */
    
    #ifndef _NETINET_IP_ICMP_H_
    #define _NETINET_IP_ICMP_H_
    
    /*
     * Interface Control Message Protocol Definitions.
     * Per RFC 792, September 1981.
     * RFC 950, August 1985. (Address Mask Request / Reply)
     * RFC 1256, September 1991. (Router Advertisement and Solicitation)
     * RFC 1108, November 1991. (Param Problem, Missing Req. Option)
     * RFC 1393, January 1993. (Traceroute)
     * RFC 1475, June 1993. (Datagram Conversion Error)
     * RFC 1812, June 1995. (adm prohib, host precedence, precedence cutoff)
     * RFC 2002, October 1996. (Mobility changes to Router Advertisement)
     */
    
    /*
     * ICMP Router Advertisement data
     */
    struct icmp_ra_addr {
            u_int32_t ira_addr;
            u_int32_t ira_preference;
    };
    
    /*
     * Structure of an icmp header.
     */
    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 cksum of struct */
            union {
                    u_int8_t  ih_pptr;      /* ICMP_PARAMPROB */
                    struct ih_exthdr {      /* RFC4884 extended header */
                            u_int8_t  iex_pad;
                            u_int8_t  iex_length;
                    } ih_exthdr;
                    struct in_addr ih_gwaddr;       /* ICMP_REDIRECT */
                    struct ih_idseq {
                              u_int16_t icd_id;
                              u_int16_t icd_seq;
                    } ih_idseq;
                    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_length       icmp_hun.ih_exthdr.iex_length
    #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 {
                             u_int32_t its_otime;
                             u_int32_t its_rtime;
                             u_int32_t its_ttime;
                   } id_ts;
                   struct id_ip  {
                             struct ip idi_ip;
                             /* options and then 64 bits of data */
                   } id_ip;
                   u_int32_t id_mask;
                   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_mask         icmp_dun.id_mask
   #define icmp_data         icmp_dun.id_data
   };
   
   struct icmp_ext_hdr {
           u_int8_t  ieh_version;          /* only high nibble used */
           u_int8_t  ieh_res;              /* reserved, must be zero */
           u_int16_t ieh_cksum;            /* ones complement cksum of ext hdr */
   };
   
   #define ICMP_EXT_HDR_VERSION    0x20
   #define ICMP_EXT_HDR_VMASK      0xf0
   #define ICMP_EXT_OFFSET         128
   
   struct icmp_ext_obj_hdr {
           u_int16_t ieo_length;           /* length of obj incl this header */
           u_int8_t  ieo_cnum;             /* class number */
           u_int8_t  ieo_ctype;            /* sub class type */
   };
   
   #define ICMP_EXT_MPLS           1
   #define ICMP_EXT_IFINFO         2
   
   /*
    * For IPv6 transition related ICMP errors.
    */
   #define ICMP_V6ADVLENMIN        (8 + sizeof(struct ip) + 40)
   #define ICMP_V6ADVLEN(p)        (8 + ((p)->icmp_ip.ip_hl << 2) + 40)
   
   /*
    * 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 (u_int32_t))    /* timestamp */
   #define ICMP_MASKLEN    12                              /* address mask */
   #define ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
   #define ICMP_ADVLENMAX  (8 + 60 + 40)                   /* maximum */
   #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.
    *      https://www.iana.org/assignments/icmp-parameters
    */
   #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       /* for crypto devs */
   #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      /* prohibited access */
   #define         ICMP_UNREACH_HOST_PRECEDENCE    14      /* precedence violat'n*/
   #define         ICMP_UNREACH_PRECEDENCE_CUTOFF  15      /* precedence 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_ALTHOSTADDR        6               /* alternate host address */
   #define ICMP_ECHO               8               /* echo service */
   #define ICMP_ROUTERADVERT       9               /* router advertisement */
   #define         ICMP_ROUTERADVERT_NORMAL                0       /* normal advertisement */
   #define         ICMP_ROUTERADVERT_NOROUTE_COMMON        16      /* selective routing */
   #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               /* req. opt. absent */
   #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_TRACEROUTE         30              /* traceroute */
   #define ICMP_DATACONVERR        31              /* data conversion error */
   #define ICMP_MOBILE_REDIRECT    32              /* mobile host redirect */
   #define ICMP_IPV6_WHEREAREYOU   33              /* IPv6 where-are-you */
   #define ICMP_IPV6_IAMHERE       34              /* IPv6 i-am-here */
   #define ICMP_MOBILE_REGREQUEST  35              /* mobile registration req */
   #define ICMP_MOBILE_REGREPLY    36              /* mobile registration reply */
   #define ICMP_SKIP               39              /* SKIP */
   #define ICMP_PHOTURIS           40              /* Photuris */
   #define         ICMP_PHOTURIS_UNKNOWN_INDEX     1       /* unknown sec index */
   #define         ICMP_PHOTURIS_AUTH_FAILED       2       /* auth failed */
   #define         ICMP_PHOTURIS_DECRYPT_FAILED    3       /* decrypt failed */
   
   #define ICMP_MAXTYPE            40
   
   #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
   struct mbuf *
           icmp_do_error(struct mbuf *, int, int, u_int32_t, int);
   void    icmp_error(struct mbuf *, int, int, u_int32_t, int);
   int     icmp_input(struct mbuf **, int *, int, int);
   void    icmp_init(void);
   int     icmp_reflect(struct mbuf *, struct mbuf **, struct in_ifaddr *);
   void    icmp_send(struct mbuf *, struct mbuf *);
   int     icmp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
   struct rtentry *
           icmp_mtudisc_clone(struct in_addr, u_int, int);
   void    icmp_mtudisc(struct icmp *, u_int);
   int     icmp_do_exthdr(struct mbuf *, u_int16_t, u_int8_t, void *, size_t);
   #endif /* _KERNEL */
   #endif /* _NETINET_IP_ICMP_H_ */

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