bsd/netinet/ip.h

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