bsd/netinet/ip.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1982, 1986, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  *
  54  *      @(#)ip.h        8.2 (Berkeley) 6/1/94
  55  */
  56
  57 #ifndef _NETINET_IP_H_
  58 #define _NETINET_IP_H_
  59
  60 /*
  61  * Definitions for internet protocol version 4.
  62  * Per RFC 791, September 1981.
  63  */
  64 #define IPVERSION       4
  65
  66 /*
  67  * Structure of an internet header, naked of options.
  68  */
  69 struct ip {
  70 #ifdef _IP_VHL
  71         u_char  ip_vhl;                 /* version << 4 | header length >> 2 */
  72 #else
  73 #if BYTE_ORDER == LITTLE_ENDIAN
  74         u_int   ip_hl:4,                /* header length */
  75                 ip_v:4;                 /* version */
  76 #endif
  77 #if BYTE_ORDER == BIG_ENDIAN
  78         u_int   ip_v:4,                 /* version */
  79                 ip_hl:4;                /* header length */
  80 #endif
  81 #endif /* not _IP_VHL */
  82         u_char  ip_tos;                 /* type of service */
  83         u_short ip_len;                 /* total length */
  84         u_short ip_id;                  /* identification */
  85         u_short ip_off;                 /* fragment offset field */
  86 #define IP_RF 0x8000                    /* reserved fragment flag */
  87 #define IP_DF 0x4000                    /* dont fragment flag */
  88 #define IP_MF 0x2000                    /* more fragments flag */
  89 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
  90         u_char  ip_ttl;                 /* time to live */
  91         u_char  ip_p;                   /* protocol */
  92         u_short ip_sum;                 /* checksum */
  93         struct  in_addr ip_src,ip_dst;  /* source and dest address */
  94 };
  95
  96 #ifdef _IP_VHL
  97 #define IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))
  98 #define IP_VHL_HL(vhl)          ((vhl) & 0x0f)
  99 #define IP_VHL_V(vhl)           ((vhl) >> 4)
 100 #define IP_VHL_BORING           0x45
 101 #endif
 102
 103 #define IP_MAXPACKET    65535           /* maximum packet size */
 104
 105 /*
 106  * Definitions for IP type of service (ip_tos)
 107  */
 108 #define IPTOS_LOWDELAY          0x10
 109 #define IPTOS_THROUGHPUT        0x08
 110 #define IPTOS_RELIABILITY       0x04
 111 #define IPTOS_MINCOST           0x02
 112 #if 1 /* ALTQ_ECN */
 113 /* ECN bits proposed by Sally Floyd */
 114 #define IPTOS_CE                0x01    /* congestion experienced */
 115 #define IPTOS_ECT               0x02    /* ECN-capable transport */
 116 #endif
 117
 118 /*
 119  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
 120  */
 121 #define IPTOS_PREC_NETCONTROL           0xe0
 122 #define IPTOS_PREC_INTERNETCONTROL      0xc0
 123 #define IPTOS_PREC_CRITIC_ECP           0xa0
 124 #define IPTOS_PREC_FLASHOVERRIDE        0x80
 125 #define IPTOS_PREC_FLASH                0x60
 126 #define IPTOS_PREC_IMMEDIATE            0x40
 127 #define IPTOS_PREC_PRIORITY             0x20
 128 #define IPTOS_PREC_ROUTINE              0x00
 129
 130 /*
 131  * Definitions for options.
 132  */
 133 #define IPOPT_COPIED(o)         ((o)&0x80)
 134 #define IPOPT_CLASS(o)          ((o)&0x60)
 135 #define IPOPT_NUMBER(o)         ((o)&0x1f)
 136
 137 #define IPOPT_CONTROL           0x00
 138 #define IPOPT_RESERVED1         0x20
 139 #define IPOPT_DEBMEAS           0x40
 140 #define IPOPT_RESERVED2         0x60
 141
 142 #define IPOPT_EOL               0               /* end of option list */
 143 #define IPOPT_NOP               1               /* no operation */
 144
 145 #define IPOPT_RR                7               /* record packet route */
 146 #define IPOPT_TS                68              /* timestamp */
 147 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 148 #define IPOPT_LSRR              131             /* loose source route */
 149 #define IPOPT_SATID             136             /* satnet id */
 150 #define IPOPT_SSRR              137             /* strict source route */
 151 #define IPOPT_RA                148             /* router alert */
 152
 153 /*
 154  * Offsets to fields in options other than EOL and NOP.
 155  */
 156 #define IPOPT_OPTVAL            0               /* option ID */
 157 #define IPOPT_OLEN              1               /* option length */
 158 #define IPOPT_OFFSET            2               /* offset within option */
 159 #define IPOPT_MINOFF            4               /* min value of above */
 160
 161 /*
 162  * Time stamp option structure.
 163  */
 164 struct  ip_timestamp {
 165         u_char  ipt_code;               /* IPOPT_TS */
 166         u_char  ipt_len;                /* size of structure (variable) */
 167         u_char  ipt_ptr;                /* index of current entry */
 168 #if BYTE_ORDER == LITTLE_ENDIAN
 169         u_int   ipt_flg:4,              /* flags, see below */
 170                 ipt_oflw:4;             /* overflow counter */
 171 #endif
 172 #if BYTE_ORDER == BIG_ENDIAN
 173         u_int   ipt_oflw:4,             /* overflow counter */
 174                 ipt_flg:4;              /* flags, see below */
 175 #endif
 176         union ipt_timestamp {
 177                 n_long  ipt_time[1];
 178                 struct  ipt_ta {
 179                         struct in_addr ipt_addr;
 180                         n_long ipt_time;
 181                 } ipt_ta[1];
 182         } ipt_timestamp;
 183 };
 184
 185 /* flag bits for ipt_flg */
 186 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 187 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 188 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 189
 190 /* bits for security (not byte swapped) */
 191 #define IPOPT_SECUR_UNCLASS     0x0000
 192 #define IPOPT_SECUR_CONFID      0xf135
 193 #define IPOPT_SECUR_EFTO        0x789a
 194 #define IPOPT_SECUR_MMMM        0xbc4d
 195 #define IPOPT_SECUR_RESTR       0xaf13
 196 #define IPOPT_SECUR_SECRET      0xd788
 197 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 198
 199 /*
 200  * Internet implementation parameters.
 201  */
 202 #define MAXTTL          255             /* maximum time to live (seconds) */
 203 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 204 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 205 #define IPTTLDEC        1               /* subtracted when forwarding */
 206
 207 #define IP_MSS          576             /* default maximum segment size */
 208
 209 #endif