bsd/netinet/ip.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1982, 1986, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
  58  * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $
  59  */
  60
  61 #ifndef _NETINET_IP_H_
  62 #define _NETINET_IP_H_
  63 #include <sys/appleapiopts.h>
  64
  65 /*
  66  * Definitions for internet protocol version 4.
  67  * Per RFC 791, September 1981.
  68  */
  69 #define IPVERSION       4
  70
  71 /*
  72  * Structure of an internet header, naked of options.
  73  */
  74 struct ip {
  75 #ifdef _IP_VHL
  76         u_char  ip_vhl;                 /* version << 4 | header length >> 2 */
  77 #else
  78 #if BYTE_ORDER == LITTLE_ENDIAN
  79         u_int   ip_hl:4,                /* header length */
  80                 ip_v:4;                 /* version */
  81 #endif
  82 #if BYTE_ORDER == BIG_ENDIAN
  83         u_int   ip_v:4,                 /* version */
  84                 ip_hl:4;                /* header length */
  85 #endif
  86 #endif /* not _IP_VHL */
  87         u_char  ip_tos;                 /* type of service */
  88         u_short ip_len;                 /* total length */
  89         u_short ip_id;                  /* identification */
  90         u_short ip_off;                 /* fragment offset field */
  91 #define IP_RF 0x8000                    /* reserved fragment flag */
  92 #define IP_DF 0x4000                    /* dont fragment flag */
  93 #define IP_MF 0x2000                    /* more fragments flag */
  94 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
  95         u_char  ip_ttl;                 /* time to live */
  96         u_char  ip_p;                   /* protocol */
  97         u_short ip_sum;                 /* checksum */
  98         struct  in_addr ip_src,ip_dst;  /* source and dest address */
  99 };
 100
 101 #ifdef _IP_VHL
 102 #define IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))
 103 #define IP_VHL_HL(vhl)          ((vhl) & 0x0f)
 104 #define IP_VHL_V(vhl)           ((vhl) >> 4)
 105 #define IP_VHL_BORING           0x45
 106 #endif
 107
 108 #define IP_MAXPACKET    65535           /* maximum packet size */
 109
 110 /*
 111  * Definitions for IP type of service (ip_tos)
 112  */
 113 #define IPTOS_LOWDELAY          0x10
 114 #define IPTOS_THROUGHPUT        0x08
 115 #define IPTOS_RELIABILITY       0x04
 116 #define IPTOS_MINCOST           0x02
 117 /* ECN bits proposed by Sally Floyd */
 118 #define IPTOS_CE                0x01    /* congestion experienced */
 119 #define IPTOS_ECT               0x02    /* ECN-capable transport */
 120
 121
 122 /*
 123  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
 124  */
 125 #define IPTOS_PREC_NETCONTROL           0xe0
 126 #define IPTOS_PREC_INTERNETCONTROL      0xc0
 127 #define IPTOS_PREC_CRITIC_ECP           0xa0
 128 #define IPTOS_PREC_FLASHOVERRIDE        0x80
 129 #define IPTOS_PREC_FLASH                0x60
 130 #define IPTOS_PREC_IMMEDIATE            0x40
 131 #define IPTOS_PREC_PRIORITY             0x20
 132 #define IPTOS_PREC_ROUTINE              0x00
 133
 134 /*
 135  * Definitions for options.
 136  */
 137 #define IPOPT_COPIED(o)         ((o)&0x80)
 138 #define IPOPT_CLASS(o)          ((o)&0x60)
 139 #define IPOPT_NUMBER(o)         ((o)&0x1f)
 140
 141 #define IPOPT_CONTROL           0x00
 142 #define IPOPT_RESERVED1         0x20
 143 #define IPOPT_DEBMEAS           0x40
 144 #define IPOPT_RESERVED2         0x60
 145
 146 #define IPOPT_EOL               0               /* end of option list */
 147 #define IPOPT_NOP               1               /* no operation */
 148
 149 #define IPOPT_RR                7               /* record packet route */
 150 #define IPOPT_TS                68              /* timestamp */
 151 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 152 #define IPOPT_LSRR              131             /* loose source route */
 153 #define IPOPT_SATID             136             /* satnet id */
 154 #define IPOPT_SSRR              137             /* strict source route */
 155 #define IPOPT_RA                148             /* router alert */
 156
 157 /*
 158  * Offsets to fields in options other than EOL and NOP.
 159  */
 160 #define IPOPT_OPTVAL            0               /* option ID */
 161 #define IPOPT_OLEN              1               /* option length */
 162 #define IPOPT_OFFSET            2               /* offset within option */
 163 #define IPOPT_MINOFF            4               /* min value of above */
 164
 165 /*
 166  * Time stamp option structure.
 167  */
 168 struct  ip_timestamp {
 169         u_char  ipt_code;               /* IPOPT_TS */
 170         u_char  ipt_len;                /* size of structure (variable) */
 171         u_char  ipt_ptr;                /* index of current entry */
 172 #if BYTE_ORDER == LITTLE_ENDIAN
 173         u_int   ipt_flg:4,              /* flags, see below */
 174                 ipt_oflw:4;             /* overflow counter */
 175 #endif
 176 #if BYTE_ORDER == BIG_ENDIAN
 177         u_int   ipt_oflw:4,             /* overflow counter */
 178                 ipt_flg:4;              /* flags, see below */
 179 #endif
 180         union ipt_timestamp {
 181                 n_long  ipt_time[1];
 182                 struct  ipt_ta {
 183                         struct in_addr ipt_addr;
 184                         n_long ipt_time;
 185                 } ipt_ta[1];
 186         } ipt_timestamp;
 187 };
 188
 189 /* flag bits for ipt_flg */
 190 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 191 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 192 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 193
 194 /* bits for security (not byte swapped) */
 195 #define IPOPT_SECUR_UNCLASS     0x0000
 196 #define IPOPT_SECUR_CONFID      0xf135
 197 #define IPOPT_SECUR_EFTO        0x789a
 198 #define IPOPT_SECUR_MMMM        0xbc4d
 199 #define IPOPT_SECUR_RESTR       0xaf13
 200 #define IPOPT_SECUR_SECRET      0xd788
 201 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 202
 203 /*
 204  * Internet implementation parameters.
 205  */
 206 #define MAXTTL          255             /* maximum time to live (seconds) */
 207 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 208 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 209 #define IPTTLDEC        1               /* subtracted when forwarding */
 210
 211 #define IP_MSS          576             /* default maximum segment size */
 212
 213 #endif