2.11BSD#431 - /usr/src/sys/netinet/ip_icmp.h

   1: /*
   2:  * Copyright (c) 1982, 1986 Regents of the University of California.
   3:  * All rights reserved.
   4:  *
   5:  * Redistribution and use in source and binary forms are permitted
   6:  * provided that this notice is preserved and that due credit is given
   7:  * to the University of California at Berkeley. The name of the University
   8:  * may not be used to endorse or promote products derived from this
   9:  * software without specific prior written permission. This software
  10:  * is provided ``as is'' without express or implied warranty.
  11:  *
  12:  *	@(#)ip_icmp.h	7.3 (Berkeley) 12/7/87
  13:  */
  14: 
  15: /*
  16:  * Interface Control Message Protocol Definitions.
  17:  * Per RFC 792, September 1981.
  18:  */
  19: 
  20: /*
  21:  * Structure of an icmp header.
  22:  */
  23: struct icmp {
  24:     u_char  icmp_type;      /* type of message, see below */
  25:     u_char  icmp_code;      /* type sub code */
  26:     u_short icmp_cksum;     /* ones complement cksum of struct */
  27:     union {
  28:         u_char ih_pptr;         /* ICMP_PARAMPROB */
  29:         struct in_addr ih_gwaddr;   /* ICMP_REDIRECT */
  30:         struct ih_idseq {
  31:             n_short icd_id;
  32:             n_short icd_seq;
  33:         } ih_idseq;
  34:         long ih_void;
  35:     } icmp_hun;
  36: #define icmp_pptr   icmp_hun.ih_pptr
  37: #define icmp_gwaddr icmp_hun.ih_gwaddr
  38: #define icmp_id     icmp_hun.ih_idseq.icd_id
  39: #define icmp_seq    icmp_hun.ih_idseq.icd_seq
  40: #define icmp_void   icmp_hun.ih_void
  41:     union {
  42:         struct id_ts {
  43:             n_time its_otime;
  44:             n_time its_rtime;
  45:             n_time its_ttime;
  46:         } id_ts;
  47:         struct id_ip  {
  48:             struct ip idi_ip;
  49:             /* options and then 64 bits of data */
  50:         } id_ip;
  51:         u_long  id_mask;
  52:         char    id_data[1];
  53:     } icmp_dun;
  54: #define icmp_otime  icmp_dun.id_ts.its_otime
  55: #define icmp_rtime  icmp_dun.id_ts.its_rtime
  56: #define icmp_ttime  icmp_dun.id_ts.its_ttime
  57: #define icmp_ip     icmp_dun.id_ip.idi_ip
  58: #define icmp_mask   icmp_dun.id_mask
  59: #define icmp_data   icmp_dun.id_data
  60: };
  61: 
  62: /*
  63:  * Lower bounds on packet lengths for various types.
  64:  * For the error advice packets must first insure that the
  65:  * packet is large enought to contain the returned ip header.
  66:  * Only then can we do the check to see if 64 bits of packet
  67:  * data have been returned, since we need to check the returned
  68:  * ip header length.
  69:  */
  70: #define ICMP_MINLEN 8               /* abs minimum */
  71: #define ICMP_TSLEN  (8 + 3 * sizeof (n_time))   /* timestamp */
  72: #define ICMP_MASKLEN    12              /* address mask */
  73: #define ICMP_ADVLENMIN  (8 + sizeof (struct ip) + 8)    /* min */
  74: #define ICMP_ADVLEN(p)  (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
  75:     /* N.B.: must separately check that ip_hl >= 5 */
  76: 
  77: /*
  78:  * Definition of type and code field values.
  79:  */
  80: #define ICMP_ECHOREPLY      0       /* echo reply */
  81: #define ICMP_UNREACH        3       /* dest unreachable, codes: */
  82: #define     ICMP_UNREACH_NET    0       /* bad net */
  83: #define     ICMP_UNREACH_HOST   1       /* bad host */
  84: #define     ICMP_UNREACH_PROTOCOL   2       /* bad protocol */
  85: #define     ICMP_UNREACH_PORT   3       /* bad port */
  86: #define     ICMP_UNREACH_NEEDFRAG   4       /* IP_DF caused drop */
  87: #define     ICMP_UNREACH_SRCFAIL    5       /* src route failed */
  88: #define ICMP_SOURCEQUENCH   4       /* packet lost, slow down */
  89: #define ICMP_REDIRECT       5       /* shorter route, codes: */
  90: #define     ICMP_REDIRECT_NET   0       /* for network */
  91: #define     ICMP_REDIRECT_HOST  1       /* for host */
  92: #define     ICMP_REDIRECT_TOSNET    2       /* for tos and net */
  93: #define     ICMP_REDIRECT_TOSHOST   3       /* for tos and host */
  94: #define ICMP_ECHO       8       /* echo service */
  95: #define ICMP_TIMXCEED       11      /* time exceeded, code: */
  96: #define     ICMP_TIMXCEED_INTRANS   0       /* ttl==0 in transit */
  97: #define     ICMP_TIMXCEED_REASS 1       /* ttl==0 in reass */
  98: #define ICMP_PARAMPROB      12      /* ip header bad */
  99: #define ICMP_TSTAMP     13      /* timestamp request */
 100: #define ICMP_TSTAMPREPLY    14      /* timestamp reply */
 101: #define ICMP_IREQ       15      /* information request */
 102: #define ICMP_IREQREPLY      16      /* information reply */
 103: #define ICMP_MASKREQ        17      /* address mask request */
 104: #define ICMP_MASKREPLY      18      /* address mask reply */
 105: 
 106: #define ICMP_MAXTYPE        18
 107: 
 108: #define ICMP_INFOTYPE(type) \
 109:     ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
 110:     (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
 111:     (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
 112:     (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)

Defined struct's

Defined macros

Usage of this include