inet/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        8.1 (Berkeley) 6/10/93
  34  */
  35
  36 #include <gnu/types.h>
  37 #include <endian.h>
  38 #include <netinet/in.h>
  39
  40 /*
  41  * Definitions for internet protocol version 4.
  42  * Per RFC 791, September 1981.
  43  */
  44 #define IPVERSION       4
  45
  46 /*
  47  * Structure of an internet header, naked of options.
  48  */
  49 struct ip {
  50 #if __BYTE_ORDER == __LITTLE_ENDIAN
  51         __u_char  ip_hl:4,              /* header length */
  52                   ip_v:4;               /* version */
  53 #endif
  54 #if __BYTE_ORDER == __BIG_ENDIAN
  55         __u_char  ip_v:4,               /* version */
  56                   ip_hl:4;              /* header length */
  57 #endif
  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                    /* dont 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 #define IP_MAXPACKET    65535           /* maximum packet size */
  73
  74 /*
  75  * Definitions for IP type of service (ip_tos)
  76  */
  77 #define IPTOS_LOWDELAY          0x10
  78 #define IPTOS_THROUGHPUT        0x08
  79 #define IPTOS_RELIABILITY       0x04
  80 #define IPTOS_LOWCOST           0x02
  81 #define IPTOS_MINCOST           IPTOS_LOWCOST
  82
  83 /*
  84  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
  85  */
  86 #define IPTOS_PREC_NETCONTROL           0xe0
  87 #define IPTOS_PREC_INTERNETCONTROL      0xc0
  88 #define IPTOS_PREC_CRITIC_ECP           0xa0
  89 #define IPTOS_PREC_FLASHOVERRIDE        0x80
  90 #define IPTOS_PREC_FLASH                0x60
  91 #define IPTOS_PREC_IMMEDIATE            0x40
  92 #define IPTOS_PREC_PRIORITY             0x20
  93 #define IPTOS_PREC_ROUTINE              0x00
  94
  95 /*
  96  * Definitions for options.
  97  */
  98 #define IPOPT_COPIED(o)         ((o)&0x80)
  99 #define IPOPT_CLASS(o)          ((o)&0x60)
 100 #define IPOPT_NUMBER(o)         ((o)&0x1f)
 101
 102 #define IPOPT_CONTROL           0x00
 103 #define IPOPT_RESERVED1         0x20
 104 #define IPOPT_DEBMEAS           0x40
 105 #define IPOPT_RESERVED2         0x60
 106
 107 #define IPOPT_EOL               0               /* end of option list */
 108 #define IPOPT_NOP               1               /* no operation */
 109
 110 #define IPOPT_RR                7               /* record packet route */
 111 #define IPOPT_TS                68              /* timestamp */
 112 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 113 #define IPOPT_LSRR              131             /* loose source route */
 114 #define IPOPT_SATID             136             /* satnet id */
 115 #define IPOPT_SSRR              137             /* strict source route */
 116
 117 /*
 118  * Offsets to fields in options other than EOL and NOP.
 119  */
 120 #define IPOPT_OPTVAL            0               /* option ID */
 121 #define IPOPT_OLEN              1               /* option length */
 122 #define IPOPT_OFFSET            2               /* offset within option */
 123 #define IPOPT_MINOFF            4               /* min value of above */
 124
 125 #define MAX_IPOPTLEN            40
 126
 127 /*
 128  * Time stamp option structure.
 129  */
 130 struct  ip_timestamp {
 131         __u_char ipt_code;              /* IPOPT_TS */
 132         __u_char ipt_len;               /* size of structure (variable) */
 133         __u_char ipt_ptr;               /* index of current entry */
 134 #if __BYTE_ORDER == __LITTLE_ENDIAN
 135         __u_char ipt_flg:4,             /* flags, see below */
 136                  ipt_oflw:4;            /* overflow counter */
 137 #endif
 138 #if __BYTE_ORDER == __BIG_ENDIAN
 139         __u_char ipt_oflw:4,            /* overflow counter */
 140                  ipt_flg:4;             /* flags, see below */
 141 #endif
 142         __u_long data[9];
 143 };
 144
 145 /* flag bits for ipt_flg */
 146 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 147 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 148 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 149
 150 /* bits for security (not byte swapped) */
 151 #define IPOPT_SECUR_UNCLASS     0x0000
 152 #define IPOPT_SECUR_CONFID      0xf135
 153 #define IPOPT_SECUR_EFTO        0x789a
 154 #define IPOPT_SECUR_MMMM        0xbc4d
 155 #define IPOPT_SECUR_RESTR       0xaf13
 156 #define IPOPT_SECUR_SECRET      0xd788
 157 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 158
 159 /*
 160  * Internet implementation parameters.
 161  */
 162 #define MAXTTL          255             /* maximum time to live (seconds) */
 163 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 164 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 165 #define IPTTLDEC        1               /* subtracted when forwarding */
 166
 167 #define IP_MSS          576             /* default maximum segment size */