bsd/netinet/ip.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * Copyright (c) 1982, 1986, 1993
  32  *      The Regents of the University of California.  All rights reserved.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  * 1. Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  * 2. Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in the
  41  *    documentation and/or other materials provided with the distribution.
  42  * 3. All advertising materials mentioning features or use of this software
  43  *    must display the following acknowledgement:
  44  *      This product includes software developed by the University of
  45  *      California, Berkeley and its contributors.
  46  * 4. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
  63  * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $
  64  */
  65
  66 #ifndef _NETINET_IP_H_
  67 #define _NETINET_IP_H_
  68 #include <sys/appleapiopts.h>
  69 #include <sys/types.h>          /* XXX temporary hack to get u_ types */
  70 #include <netinet/in.h>
  71 #include <netinet/in_systm.h>
  72
  73
  74 /*
  75  * Definitions for internet protocol version 4.
  76  * Per RFC 791, September 1981.
  77  */
  78 #define IPVERSION       4
  79
  80 /*
  81  * Structure of an internet header, naked of options.
  82  */
  83 struct ip {
  84 #ifdef _IP_VHL
  85         u_char  ip_vhl;                 /* version << 4 | header length >> 2 */
  86 #else
  87 #if BYTE_ORDER == LITTLE_ENDIAN
  88         u_int   ip_hl:4,                /* header length */
  89                 ip_v:4;                 /* version */
  90 #endif
  91 #if BYTE_ORDER == BIG_ENDIAN
  92         u_int   ip_v:4,                 /* version */
  93                 ip_hl:4;                /* header length */
  94 #endif
  95 #endif /* not _IP_VHL */
  96         u_char  ip_tos;                 /* type of service */
  97         u_short ip_len;                 /* total length */
  98         u_short ip_id;                  /* identification */
  99         u_short ip_off;                 /* fragment offset field */
 100 #define IP_RF 0x8000                    /* reserved fragment flag */
 101 #define IP_DF 0x4000                    /* dont fragment flag */
 102 #define IP_MF 0x2000                    /* more fragments flag */
 103 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
 104         u_char  ip_ttl;                 /* time to live */
 105         u_char  ip_p;                   /* protocol */
 106         u_short ip_sum;                 /* checksum */
 107         struct  in_addr ip_src,ip_dst;  /* source and dest address */
 108 };
 109
 110 #ifdef _IP_VHL
 111 #define IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))
 112 #define IP_VHL_HL(vhl)          ((vhl) & 0x0f)
 113 #define IP_VHL_V(vhl)           ((vhl) >> 4)
 114 #define IP_VHL_BORING           0x45
 115 #endif
 116
 117 #define IP_MAXPACKET    65535           /* maximum packet size */
 118
 119 /*
 120  * Definitions for IP type of service (ip_tos)
 121  */
 122 #define IPTOS_LOWDELAY          0x10
 123 #define IPTOS_THROUGHPUT        0x08
 124 #define IPTOS_RELIABILITY       0x04
 125 #define IPTOS_MINCOST           0x02
 126 /* ECN bits proposed by Sally Floyd */
 127 #define IPTOS_CE                0x01    /* congestion experienced */
 128 #define IPTOS_ECT               0x02    /* ECN-capable transport */
 129
 130
 131 /*
 132  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
 133  */
 134 #define IPTOS_PREC_NETCONTROL           0xe0
 135 #define IPTOS_PREC_INTERNETCONTROL      0xc0
 136 #define IPTOS_PREC_CRITIC_ECP           0xa0
 137 #define IPTOS_PREC_FLASHOVERRIDE        0x80
 138 #define IPTOS_PREC_FLASH                0x60
 139 #define IPTOS_PREC_IMMEDIATE            0x40
 140 #define IPTOS_PREC_PRIORITY             0x20
 141 #define IPTOS_PREC_ROUTINE              0x00
 142
 143 /*
 144  * Definitions for options.
 145  */
 146 #define IPOPT_COPIED(o)         ((o)&0x80)
 147 #define IPOPT_CLASS(o)          ((o)&0x60)
 148 #define IPOPT_NUMBER(o)         ((o)&0x1f)
 149
 150 #define IPOPT_CONTROL           0x00
 151 #define IPOPT_RESERVED1         0x20
 152 #define IPOPT_DEBMEAS           0x40
 153 #define IPOPT_RESERVED2         0x60
 154
 155 #define IPOPT_EOL               0               /* end of option list */
 156 #define IPOPT_NOP               1               /* no operation */
 157
 158 #define IPOPT_RR                7               /* record packet route */
 159 #define IPOPT_TS                68              /* timestamp */
 160 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 161 #define IPOPT_LSRR              131             /* loose source route */
 162 #define IPOPT_SATID             136             /* satnet id */
 163 #define IPOPT_SSRR              137             /* strict source route */
 164 #define IPOPT_RA                148             /* router alert */
 165
 166 /*
 167  * Offsets to fields in options other than EOL and NOP.
 168  */
 169 #define IPOPT_OPTVAL            0               /* option ID */
 170 #define IPOPT_OLEN              1               /* option length */
 171 #define IPOPT_OFFSET            2               /* offset within option */
 172 #define IPOPT_MINOFF            4               /* min value of above */
 173
 174 /*
 175  * Time stamp option structure.
 176  */
 177 struct  ip_timestamp {
 178         u_char  ipt_code;               /* IPOPT_TS */
 179         u_char  ipt_len;                /* size of structure (variable) */
 180         u_char  ipt_ptr;                /* index of current entry */
 181 #if BYTE_ORDER == LITTLE_ENDIAN
 182         u_int   ipt_flg:4,              /* flags, see below */
 183                 ipt_oflw:4;             /* overflow counter */
 184 #endif
 185 #if BYTE_ORDER == BIG_ENDIAN
 186         u_int   ipt_oflw:4,             /* overflow counter */
 187                 ipt_flg:4;              /* flags, see below */
 188 #endif
 189         union ipt_timestamp {
 190                 n_long  ipt_time[1];
 191                 struct  ipt_ta {
 192                         struct in_addr ipt_addr;
 193                         n_long ipt_time;
 194                 } ipt_ta[1];
 195         } ipt_timestamp;
 196 };
 197
 198 /* flag bits for ipt_flg */
 199 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 200 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 201 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 202
 203 /* bits for security (not byte swapped) */
 204 #define IPOPT_SECUR_UNCLASS     0x0000
 205 #define IPOPT_SECUR_CONFID      0xf135
 206 #define IPOPT_SECUR_EFTO        0x789a
 207 #define IPOPT_SECUR_MMMM        0xbc4d
 208 #define IPOPT_SECUR_RESTR       0xaf13
 209 #define IPOPT_SECUR_SECRET      0xd788
 210 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 211
 212 /*
 213  * Internet implementation parameters.
 214  */
 215 #define MAXTTL          255             /* maximum time to live (seconds) */
 216 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 217 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 218 #define IPTTLDEC        1               /* subtracted when forwarding */
 219
 220 #define IP_MSS          576             /* default maximum segment size */
 221
 222 #endif