The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ip_icmp.h   8.1 (Berkeley) 6/10/93
   32  * $FreeBSD$
   33  */
   34 
   35 #ifndef _NETINET_IP_ICMP_H_
   36 #define _NETINET_IP_ICMP_H_
   37 
   38 /*
   39  * Interface Control Message Protocol Definitions.
   40  * Per RFC 792, September 1981.
   41  */
   42 
   43 /*
   44  * Internal of an ICMP Router Advertisement
   45  */
   46 struct icmp_ra_addr {
   47         u_int32_t ira_addr;
   48         u_int32_t ira_preference;
   49 };
   50 
   51 /*
   52  * Structure of an icmp header.
   53  */
   54 struct icmphdr {
   55         u_char  icmp_type;              /* type of message, see below */
   56         u_char  icmp_code;              /* type sub code */
   57         u_short icmp_cksum;             /* ones complement cksum of struct */
   58 };
   59 
   60 /*
   61  * Structure of an icmp packet.
   62  *
   63  * XXX: should start with a struct icmphdr.
   64  */
   65 struct icmp {
   66         u_char  icmp_type;              /* type of message, see below */
   67         u_char  icmp_code;              /* type sub code */
   68         u_short icmp_cksum;             /* ones complement cksum of struct */
   69         union {
   70                 u_char ih_pptr;                 /* ICMP_PARAMPROB */
   71                 struct in_addr ih_gwaddr;       /* ICMP_REDIRECT */
   72                 struct ih_idseq {
   73                         uint16_t        icd_id; /* network format */
   74                         uint16_t        icd_seq; /* network format */
   75                 } ih_idseq;
   76                 int ih_void;
   77 
   78                 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
   79                 struct ih_pmtu {
   80                         uint16_t ipm_void;      /* network format */
   81                         uint16_t ipm_nextmtu;   /* network format */
   82                 } ih_pmtu;
   83 
   84                 struct ih_rtradv {
   85                         u_char irt_num_addrs;
   86                         u_char irt_wpa;
   87                         u_int16_t irt_lifetime;
   88                 } ih_rtradv;
   89         } icmp_hun;
   90 #define icmp_pptr       icmp_hun.ih_pptr
   91 #define icmp_gwaddr     icmp_hun.ih_gwaddr
   92 #define icmp_id         icmp_hun.ih_idseq.icd_id
   93 #define icmp_seq        icmp_hun.ih_idseq.icd_seq
   94 #define icmp_void       icmp_hun.ih_void
   95 #define icmp_pmvoid     icmp_hun.ih_pmtu.ipm_void
   96 #define icmp_nextmtu    icmp_hun.ih_pmtu.ipm_nextmtu
   97 #define icmp_num_addrs  icmp_hun.ih_rtradv.irt_num_addrs
   98 #define icmp_wpa        icmp_hun.ih_rtradv.irt_wpa
   99 #define icmp_lifetime   icmp_hun.ih_rtradv.irt_lifetime
  100         union {
  101                 struct id_ts {                  /* ICMP Timestamp */
  102                         /*
  103                          * The next 3 fields are in network format,
  104                          * milliseconds since 00:00 UTC
  105                          */
  106                         uint32_t its_otime;     /* Originate */
  107                         uint32_t its_rtime;     /* Receive */
  108                         uint32_t its_ttime;     /* Transmit */
  109                 } id_ts;
  110                 struct id_ip  {
  111                         struct ip idi_ip;
  112                         /* options and then 64 bits of data */
  113                 } id_ip;
  114                 struct icmp_ra_addr id_radv;
  115                 u_int32_t id_mask;
  116                 char    id_data[1];
  117         } icmp_dun;
  118 #define icmp_otime      icmp_dun.id_ts.its_otime
  119 #define icmp_rtime      icmp_dun.id_ts.its_rtime
  120 #define icmp_ttime      icmp_dun.id_ts.its_ttime
  121 #define icmp_ip         icmp_dun.id_ip.idi_ip
  122 #define icmp_radv       icmp_dun.id_radv
  123 #define icmp_mask       icmp_dun.id_mask
  124 #define icmp_data       icmp_dun.id_data
  125 };
  126 
  127 /*
  128  * Lower bounds on packet lengths for various types.
  129  * For the error advice packets must first insure that the
  130  * packet is large enough to contain the returned ip header.
  131  * Only then can we do the check to see if 64 bits of packet
  132  * data have been returned, since we need to check the returned
  133  * ip header length.
  134  */
  135 #define ICMP_MINLEN     8                               /* abs minimum */
  136 #define ICMP_TSLEN      (8 + 3 * sizeof (uint32_t))     /* timestamp */
  137 #define ICMP_MASKLEN    12                              /* address mask */
  138 #define ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
  139 #define ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
  140         /* N.B.: must separately check that ip_hl >= 5 */
  141         /* This is the minimum length required by RFC 792. */
  142 /*
  143  * ICMP_ADVLENPREF is the preferred number of bytes which should be contiguous.
  144  * SCTP needs additional 12 bytes to be able to access the initiate tag
  145  * in packets containing an INIT chunk. For also supporting SCTP/UDP,
  146  * additional 8 bytes are needed.
  147  */
  148 #define ICMP_ADVLENPREF(p)      (8 + ((p)->icmp_ip.ip_hl << 2) + 8 + 8 + 12)
  149 
  150 /*
  151  * Definition of type and code field values.
  152  */
  153 #define ICMP_ECHOREPLY          0               /* echo reply */
  154 #define ICMP_UNREACH            3               /* dest unreachable, codes: */
  155 #define         ICMP_UNREACH_NET        0               /* bad net */
  156 #define         ICMP_UNREACH_HOST       1               /* bad host */
  157 #define         ICMP_UNREACH_PROTOCOL   2               /* bad protocol */
  158 #define         ICMP_UNREACH_PORT       3               /* bad port */
  159 #define         ICMP_UNREACH_NEEDFRAG   4               /* IP_DF caused drop */
  160 #define         ICMP_UNREACH_SRCFAIL    5               /* src route failed */
  161 #define         ICMP_UNREACH_NET_UNKNOWN 6              /* unknown net */
  162 #define         ICMP_UNREACH_HOST_UNKNOWN 7             /* unknown host */
  163 #define         ICMP_UNREACH_ISOLATED   8               /* src host isolated */
  164 #define         ICMP_UNREACH_NET_PROHIB 9               /* prohibited access */
  165 #define         ICMP_UNREACH_HOST_PROHIB 10             /* ditto */
  166 #define         ICMP_UNREACH_TOSNET     11              /* bad tos for net */
  167 #define         ICMP_UNREACH_TOSHOST    12              /* bad tos for host */
  168 #define         ICMP_UNREACH_FILTER_PROHIB 13           /* admin prohib */
  169 #define         ICMP_UNREACH_HOST_PRECEDENCE 14         /* host prec vio. */
  170 #define         ICMP_UNREACH_PRECEDENCE_CUTOFF 15       /* prec cutoff */
  171 #define ICMP_SOURCEQUENCH       4               /* packet lost, slow down */
  172 #define ICMP_REDIRECT           5               /* shorter route, codes: */
  173 #define         ICMP_REDIRECT_NET       0               /* for network */
  174 #define         ICMP_REDIRECT_HOST      1               /* for host */
  175 #define         ICMP_REDIRECT_TOSNET    2               /* for tos and net */
  176 #define         ICMP_REDIRECT_TOSHOST   3               /* for tos and host */
  177 #define ICMP_ALTHOSTADDR        6               /* alternate host address */
  178 #define ICMP_ECHO               8               /* echo service */
  179 #define ICMP_ROUTERADVERT       9               /* router advertisement */
  180 #define         ICMP_ROUTERADVERT_NORMAL                0       /* normal advertisement */
  181 #define         ICMP_ROUTERADVERT_NOROUTE_COMMON        16      /* selective routing */
  182 #define ICMP_ROUTERSOLICIT      10              /* router solicitation */
  183 #define ICMP_TIMXCEED           11              /* time exceeded, code: */
  184 #define         ICMP_TIMXCEED_INTRANS   0               /* ttl==0 in transit */
  185 #define         ICMP_TIMXCEED_REASS     1               /* ttl==0 in reass */
  186 #define ICMP_PARAMPROB          12              /* ip header bad */
  187 #define         ICMP_PARAMPROB_ERRATPTR 0               /* error at param ptr */
  188 #define         ICMP_PARAMPROB_OPTABSENT 1              /* req. opt. absent */
  189 #define         ICMP_PARAMPROB_LENGTH 2                 /* bad length */
  190 #define ICMP_TSTAMP             13              /* timestamp request */
  191 #define ICMP_TSTAMPREPLY        14              /* timestamp reply */
  192 #define ICMP_IREQ               15              /* information request */
  193 #define ICMP_IREQREPLY          16              /* information reply */
  194 #define ICMP_MASKREQ            17              /* address mask request */
  195 #define ICMP_MASKREPLY          18              /* address mask reply */
  196 #define ICMP_TRACEROUTE         30              /* traceroute */
  197 #define ICMP_DATACONVERR        31              /* data conversion error */
  198 #define ICMP_MOBILE_REDIRECT    32              /* mobile host redirect */
  199 #define ICMP_IPV6_WHEREAREYOU   33              /* IPv6 where-are-you */
  200 #define ICMP_IPV6_IAMHERE       34              /* IPv6 i-am-here */
  201 #define ICMP_MOBILE_REGREQUEST  35              /* mobile registration req */
  202 #define ICMP_MOBILE_REGREPLY    36              /* mobile registration reply */
  203 #define ICMP_SKIP               39              /* SKIP */
  204 #define ICMP_PHOTURIS           40              /* Photuris */
  205 #define         ICMP_PHOTURIS_UNKNOWN_INDEX     1       /* unknown sec index */
  206 #define         ICMP_PHOTURIS_AUTH_FAILED       2       /* auth failed */
  207 #define         ICMP_PHOTURIS_DECRYPT_FAILED    3       /* decrypt failed */
  208 
  209 #define ICMP_MAXTYPE            40
  210 
  211 #define ICMP_INFOTYPE(type) \
  212         ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
  213         (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
  214         (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
  215         (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
  216         (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
  217 
  218 #ifdef _KERNEL
  219 void    icmp_error(struct mbuf *, int, int, uint32_t, int);
  220 int     icmp_input(struct mbuf **, int *, int);
  221 int     ip_next_mtu(int, int);
  222 #endif
  223 
  224 #endif

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