dlls/icmp/ip.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
  30  * $FreeBSD: src/sys/netinet/ip.h,v 1.16 1999/08/28 00:49:19 peter Exp $
  31  */
  32
  33 #ifndef _NETINET_IP_H_
  34 #define _NETINET_IP_H_
  35
  36 /*
  37  * Definitions for internet protocol version 4.
  38  * Per RFC 791, September 1981.
  39  */
  40 #define IPVERSION       4
  41
  42 /*
  43  * Structure of an internet header, naked of options.
  44  */
  45 struct ip {
  46 #ifdef _IP_VHL
  47         u_char  ip_vhl;                 /* version << 4 | header length >> 2 */
  48 #else
  49 #if BYTE_ORDER == LITTLE_ENDIAN
  50         u_int   ip_hl:4,                /* header length */
  51                 ip_v:4;                 /* version */
  52 #endif
  53 #if BYTE_ORDER == BIG_ENDIAN
  54         u_int   ip_v:4,                 /* version */
  55                 ip_hl:4;                /* header length */
  56 #endif
  57 #endif /* not _IP_VHL */
  58         u_char  ip_tos;                 /* type of service */
  59         u_short ip_len;                 /* total length */
  60         u_short ip_id;                  /* identification */
  61         u_short ip_off;                 /* fragment offset field */
  62 #define IP_RF 0x8000                    /* reserved fragment flag */
  63 #define IP_DF 0x4000                    /* don't fragment flag */
  64 #define IP_MF 0x2000                    /* more fragments flag */
  65 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
  66         u_char  ip_ttl;                 /* time to live */
  67         u_char  ip_p;                   /* protocol */
  68         u_short ip_sum;                 /* checksum */
  69         struct  in_addr ip_src,ip_dst;  /* source and dest address */
  70 };
  71
  72 #ifdef _IP_VHL
  73 #define IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))
  74 #define IP_VHL_HL(vhl)          ((vhl) & 0x0f)
  75 #define IP_VHL_V(vhl)           ((vhl) >> 4)
  76 #define IP_VHL_BORING           0x45
  77 #endif
  78
  79 #define IP_MAXPACKET    65535           /* maximum packet size */
  80
  81 /*
  82  * Definitions for IP type of service (ip_tos)
  83  */
  84 #define IPTOS_LOWDELAY          0x10
  85 #define IPTOS_THROUGHPUT        0x08
  86 #define IPTOS_RELIABILITY       0x04
  87 #define IPTOS_MINCOST           0x02
  88
  89 /*
  90  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
  91  */
  92 #define IPTOS_PREC_NETCONTROL           0xe0
  93 #define IPTOS_PREC_INTERNETCONTROL      0xc0
  94 #define IPTOS_PREC_CRITIC_ECP           0xa0
  95 #define IPTOS_PREC_FLASHOVERRIDE        0x80
  96 #define IPTOS_PREC_FLASH                0x60
  97 #define IPTOS_PREC_IMMEDIATE            0x40
  98 #define IPTOS_PREC_PRIORITY             0x20
  99 #define IPTOS_PREC_ROUTINE              0x00
 100
 101 /*
 102  * Definitions for options.
 103  */
 104 #define IPOPT_COPIED(o)         ((o)&0x80)
 105 #define IPOPT_CLASS(o)          ((o)&0x60)
 106 #define IPOPT_NUMBER(o)         ((o)&0x1f)
 107
 108 #define IPOPT_CONTROL           0x00
 109 #define IPOPT_RESERVED1         0x20
 110 #define IPOPT_DEBMEAS           0x40
 111 #define IPOPT_RESERVED2         0x60
 112
 113 #define IPOPT_EOL               0               /* end of option list */
 114 #define IPOPT_NOP               1               /* no operation */
 115
 116 #define IPOPT_RR                7               /* record packet route */
 117 #define IPOPT_TS                68              /* timestamp */
 118 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 119 #define IPOPT_LSRR              131             /* loose source route */
 120 #define IPOPT_SATID             136             /* satnet id */
 121 #define IPOPT_SSRR              137             /* strict source route */
 122 #define IPOPT_RA                148             /* router alert */
 123
 124 /*
 125  * Offsets to fields in options other than EOL and NOP.
 126  */
 127 #define IPOPT_OPTVAL            0               /* option ID */
 128 #define IPOPT_OLEN              1               /* option length */
 129 #define IPOPT_OFFSET            2               /* offset within option */
 130 #define IPOPT_MINOFF            4               /* min value of above */
 131
 132 /*
 133  * Time stamp option structure.
 134  */
 135 struct  ip_timestamp {
 136         u_char  ipt_code;               /* IPOPT_TS */
 137         u_char  ipt_len;                /* size of structure (variable) */
 138         u_char  ipt_ptr;                /* index of current entry */
 139 #if BYTE_ORDER == LITTLE_ENDIAN
 140         u_int   ipt_flg:4,              /* flags, see below */
 141                 ipt_oflw:4;             /* overflow counter */
 142 #endif
 143 #if BYTE_ORDER == BIG_ENDIAN
 144         u_int   ipt_oflw:4,             /* overflow counter */
 145                 ipt_flg:4;              /* flags, see below */
 146 #endif
 147         union ipt_timestamp {
 148                 n_long  ipt_time[1];
 149                 struct  ipt_ta {
 150                         struct in_addr ipt_addr;
 151                         n_long ipt_time;
 152                 } ipt_ta[1];
 153         } ipt_timestamp;
 154 };
 155
 156 /* flag bits for ipt_flg */
 157 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 158 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 159 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 160
 161 /* bits for security (not byte swapped) */
 162 #define IPOPT_SECUR_UNCLASS     0x0000
 163 #define IPOPT_SECUR_CONFID      0xf135
 164 #define IPOPT_SECUR_EFTO        0x789a
 165 #define IPOPT_SECUR_MMMM        0xbc4d
 166 #define IPOPT_SECUR_RESTR       0xaf13
 167 #define IPOPT_SECUR_SECRET      0xd788
 168 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 169
 170 /*
 171  * Internet implementation parameters.
 172  */
 173 #define MAXTTL          255             /* maximum time to live (seconds) */
 174 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 175 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 176 #define IPTTLDEC        1               /* subtracted when forwarding */
 177
 178 #define IP_MSS          576             /* default maximum segment size */
 179
 180 #endif