The Tcpdump Group git mirrors - tcpdump/blob - win32/Include/Netinet/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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
  34  */
  35 #ifndef WIN32
  36 #include <endian.h>
  37 #else
  38 #ifndef LITTLE_ENDIAN
  39 #define LITTLE_ENDIAN 1234
  40 #define BIG_ENDIAN 4321
  41 #define BYTE_ORDER LITTLE_ENDIAN
  42 #endif
  43 #endif
  44
  45 /*
  46  * Definitions for internet protocol version 4.
  47  * Per RFC 791, September 1981.
  48  */
  49 #define IPVERSION       4
  50
  51 /*
  52  * Structure of an internet header, naked of options.
  53  *
  54  * We declare ip_len and ip_off to be short, rather than u_short
  55  * pragmatically since otherwise unsigned comparisons can result
  56  * against negative integers quite easily, and fail in subtle ways.
  57  */
  58 struct ip {
  59 #if BYTE_ORDER == LITTLE_ENDIAN
  60         u_char  ip_hl:4,                /* header length */
  61                 ip_v:4;                 /* version */
  62 #endif
  63 #if BYTE_ORDER == BIG_ENDIAN
  64         u_char  ip_v:4,                 /* version */
  65                 ip_hl:4;                /* header length */
  66 #endif
  67         u_char  ip_tos;                 /* type of service */
  68         short   ip_len;                 /* total length */
  69         u_short ip_id;                  /* identification */
  70         short   ip_off;                 /* fragment offset field */
  71 #define IP_DF 0x4000                    /* dont fragment flag */
  72 #define IP_MF 0x2000                    /* more fragments flag */
  73 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
  74         u_char  ip_ttl;                 /* time to live */
  75         u_char  ip_p;                   /* protocol */
  76         u_short ip_sum;                 /* checksum */
  77         struct  in_addr ip_src,ip_dst;  /* source and dest address */
  78 };
  79
  80 #define IP_MAXPACKET    65535           /* maximum packet size */
  81
  82 /*
  83  * Definitions for IP type of service (ip_tos)
  84  */
  85 #define IPTOS_LOWDELAY          0x10
  86 #define IPTOS_THROUGHPUT        0x08
  87 #define IPTOS_RELIABILITY       0x04
  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
 123 /*
 124  * Offsets to fields in options other than EOL and NOP.
 125  */
 126 #define IPOPT_OPTVAL            0               /* option ID */
 127 #define IPOPT_OLEN              1               /* option length */
 128 #define IPOPT_OFFSET            2               /* offset within option */
 129 #define IPOPT_MINOFF            4               /* min value of above */
 130
 131 /*
 132  * Time stamp option structure.
 133  */
 134 struct  ip_timestamp {
 135         u_char  ipt_code;               /* IPOPT_TS */
 136         u_char  ipt_len;                /* size of structure (variable) */
 137         u_char  ipt_ptr;                /* index of current entry */
 138 #if BYTE_ORDER == LITTLE_ENDIAN
 139         u_char  ipt_flg:4,              /* flags, see below */
 140                 ipt_oflw:4;             /* overflow counter */
 141 #endif
 142 #if BYTE_ORDER == BIG_ENDIAN
 143         u_char  ipt_oflw:4,             /* overflow counter */
 144                 ipt_flg:4;              /* flags, see below */
 145 #endif
 146         union ipt_timestamp {
 147                 n_long  ipt_time[1];
 148                 struct  ipt_ta {
 149                         struct in_addr ipt_addr;
 150                         n_long ipt_time;
 151                 } ipt_ta[1];
 152         } ipt_timestamp;
 153 };
 154
 155 /* flag bits for ipt_flg */
 156 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 157 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 158 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 159
 160 /* bits for security (not byte swapped) */
 161 #define IPOPT_SECUR_UNCLASS     0x0000
 162 #define IPOPT_SECUR_CONFID      0xf135
 163 #define IPOPT_SECUR_EFTO        0x789a
 164 #define IPOPT_SECUR_MMMM        0xbc4d
 165 #define IPOPT_SECUR_RESTR       0xaf13
 166 #define IPOPT_SECUR_SECRET      0xd788
 167 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 168
 169 /*
 170  * Internet implementation parameters.
 171  */
 172 #define MAXTTL          255             /* maximum time to live (seconds) */
 173 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 174 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 175 #define IPTTLDEC        1               /* subtracted when forwarding */
 176
 177 #define IP_MSS          576             /* default maximum segment size */