include/netinet/ip.h

   1 /* Copyright (C) 1991,92,93,95,96,97,98,99,2000,2009 Free Software
   2    Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef __NETINET_IP_H
  20 #define __NETINET_IP_H 1
  21
  22 #include <features.h>
  23 #include <sys/types.h>
  24
  25 #include <netinet/in.h>
  26
  27 __BEGIN_DECLS
  28
  29 struct timestamp
  30   {
  31     u_int8_t len;
  32     u_int8_t ptr;
  33 #if __BYTE_ORDER == __LITTLE_ENDIAN
  34     unsigned int flags:4;
  35     unsigned int overflow:4;
  36 #elif __BYTE_ORDER == __BIG_ENDIAN
  37     unsigned int overflow:4;
  38     unsigned int flags:4;
  39 #else
  40 # error "Please fix <bits/endian.h>"
  41 #endif
  42     u_int32_t data[9];
  43   };
  44
  45 struct iphdr
  46   {
  47 #if __BYTE_ORDER == __LITTLE_ENDIAN
  48     unsigned int ihl:4;
  49     unsigned int version:4;
  50 #elif __BYTE_ORDER == __BIG_ENDIAN
  51     unsigned int version:4;
  52     unsigned int ihl:4;
  53 #else
  54 # error "Please fix <bits/endian.h>"
  55 #endif
  56     u_int8_t tos;
  57     u_int16_t tot_len;
  58     u_int16_t id;
  59     u_int16_t frag_off;
  60     u_int8_t ttl;
  61     u_int8_t protocol;
  62     u_int16_t check;
  63     u_int32_t saddr;
  64     u_int32_t daddr;
  65     /*The options start here. */
  66   };
  67
  68 #ifdef __USE_BSD
  69 /*
  70  * Copyright (c) 1982, 1986, 1993
  71  *      The Regents of the University of California.  All rights reserved.
  72  *
  73  * Redistribution and use in source and binary forms, with or without
  74  * modification, are permitted provided that the following conditions
  75  * are met:
  76  * 1. Redistributions of source code must retain the above copyright
  77  *    notice, this list of conditions and the following disclaimer.
  78  * 2. Redistributions in binary form must reproduce the above copyright
  79  *    notice, this list of conditions and the following disclaimer in the
  80  *    documentation and/or other materials provided with the distribution.
  81  * 4. Neither the name of the University nor the names of its contributors
  82  *    may be used to endorse or promote products derived from this software
  83  *    without specific prior written permission.
  84  *
  85  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  86  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  87  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  88  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  89  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  90  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  91  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  92  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  93  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  94  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  95  * SUCH DAMAGE.
  96  *
  97  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
  98  */
  99
 100 /*
 101  * Definitions for internet protocol version 4.
 102  * Per RFC 791, September 1981.
 103  */
 104
 105 /*
 106  * Structure of an internet header, naked of options.
 107  */
 108 struct ip
 109   {
 110 #if __BYTE_ORDER == __LITTLE_ENDIAN
 111     unsigned int ip_hl:4;               /* header length */
 112     unsigned int ip_v:4;                /* version */
 113 #endif
 114 #if __BYTE_ORDER == __BIG_ENDIAN
 115     unsigned int ip_v:4;                /* version */
 116     unsigned int ip_hl:4;               /* header length */
 117 #endif
 118     u_int8_t ip_tos;                    /* type of service */
 119     u_short ip_len;                     /* total length */
 120     u_short ip_id;                      /* identification */
 121     u_short ip_off;                     /* fragment offset field */
 122 #define IP_RF 0x8000                    /* reserved fragment flag */
 123 #define IP_DF 0x4000                    /* dont fragment flag */
 124 #define IP_MF 0x2000                    /* more fragments flag */
 125 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
 126     u_int8_t ip_ttl;                    /* time to live */
 127     u_int8_t ip_p;                      /* protocol */
 128     u_short ip_sum;                     /* checksum */
 129     struct in_addr ip_src, ip_dst;      /* source and dest address */
 130   };
 131
 132 /*
 133  * Time stamp option structure.
 134  */
 135 struct ip_timestamp
 136   {
 137     u_int8_t ipt_code;                  /* IPOPT_TS */
 138     u_int8_t ipt_len;                   /* size of structure (variable) */
 139     u_int8_t ipt_ptr;                   /* index of current entry */
 140 #if __BYTE_ORDER == __LITTLE_ENDIAN
 141     unsigned int ipt_flg:4;             /* flags, see below */
 142     unsigned int ipt_oflw:4;            /* overflow counter */
 143 #endif
 144 #if __BYTE_ORDER == __BIG_ENDIAN
 145     unsigned int ipt_oflw:4;            /* overflow counter */
 146     unsigned int ipt_flg:4;             /* flags, see below */
 147 #endif
 148     u_int32_t data[9];
 149   };
 150 #endif /* __USE_BSD */
 151
 152 #define IPVERSION       4               /* IP version number */
 153 #define IP_MAXPACKET    65535           /* maximum packet size */
 154
 155 /*
 156  * Definitions for Explicit Congestion Notification (ECN)
 157  *
 158  * Taken from RFC-3168, Section 5.
 159  */
 160
 161 #define IPTOS_ECN_MASK          0x03
 162 #define IPTOS_ECN(x)            ((x) & IPTOS_ECN_MASK)
 163 #define IPTOS_ECN_NOT_ECT       0x00
 164 #define IPTOS_ECN_ECT1          0x01
 165 #define IPTOS_ECN_ECT0          0x02
 166 #define IPTOS_ECN_CE            0x03
 167
 168 /*
 169  * Definitions for IP differentiated services code points (DSCP)
 170  *
 171  * Taken from RFC-2597, Section 6 and RFC-2598, Section 2.3.
 172  */
 173
 174 #define IPTOS_DSCP_MASK         0xfc
 175 #define IPTOS_DSCP(x)           ((x) & IPTOS_DSCP_MASK)
 176 #define IPTOS_DSCP_AF11         0x28
 177 #define IPTOS_DSCP_AF12         0x30
 178 #define IPTOS_DSCP_AF13         0x38
 179 #define IPTOS_DSCP_AF21         0x48
 180 #define IPTOS_DSCP_AF22         0x50
 181 #define IPTOS_DSCP_AF23         0x58
 182 #define IPTOS_DSCP_AF31         0x68
 183 #define IPTOS_DSCP_AF32         0x70
 184 #define IPTOS_DSCP_AF33         0x78
 185 #define IPTOS_DSCP_AF41         0x88
 186 #define IPTOS_DSCP_AF42         0x90
 187 #define IPTOS_DSCP_AF43         0x98
 188 #define IPTOS_DSCP_EF           0xb8
 189
 190 /*
 191  * Definitions for IP type of service (ip_tos)
 192  */
 193 #define IPTOS_TOS_MASK          0x1E
 194 #define IPTOS_TOS(tos)          ((tos) & IPTOS_TOS_MASK)
 195 #define IPTOS_LOWDELAY          0x10
 196 #define IPTOS_THROUGHPUT        0x08
 197 #define IPTOS_RELIABILITY       0x04
 198 #define IPTOS_LOWCOST           0x02
 199 #define IPTOS_MINCOST           IPTOS_LOWCOST
 200
 201 /*
 202  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
 203  */
 204 #define IPTOS_PREC_MASK                 0xe0
 205 #define IPTOS_PREC(tos)                ((tos) & IPTOS_PREC_MASK)
 206 #define IPTOS_PREC_NETCONTROL           0xe0
 207 #define IPTOS_PREC_INTERNETCONTROL      0xc0
 208 #define IPTOS_PREC_CRITIC_ECP           0xa0
 209 #define IPTOS_PREC_FLASHOVERRIDE        0x80
 210 #define IPTOS_PREC_FLASH                0x60
 211 #define IPTOS_PREC_IMMEDIATE            0x40
 212 #define IPTOS_PREC_PRIORITY             0x20
 213 #define IPTOS_PREC_ROUTINE              0x00
 214
 215 /*
 216  * Definitions for options.
 217  */
 218 #define IPOPT_COPY              0x80
 219 #define IPOPT_CLASS_MASK        0x60
 220 #define IPOPT_NUMBER_MASK       0x1f
 221
 222 #define IPOPT_COPIED(o)         ((o) & IPOPT_COPY)
 223 #define IPOPT_CLASS(o)          ((o) & IPOPT_CLASS_MASK)
 224 #define IPOPT_NUMBER(o)         ((o) & IPOPT_NUMBER_MASK)
 225
 226 #define IPOPT_CONTROL           0x00
 227 #define IPOPT_RESERVED1         0x20
 228 #define IPOPT_DEBMEAS           0x40
 229 #define IPOPT_MEASUREMENT       IPOPT_DEBMEAS
 230 #define IPOPT_RESERVED2         0x60
 231
 232 #define IPOPT_EOL               0               /* end of option list */
 233 #define IPOPT_END               IPOPT_EOL
 234 #define IPOPT_NOP               1               /* no operation */
 235 #define IPOPT_NOOP              IPOPT_NOP
 236
 237 #define IPOPT_RR                7               /* record packet route */
 238 #define IPOPT_TS                68              /* timestamp */
 239 #define IPOPT_TIMESTAMP         IPOPT_TS
 240 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 241 #define IPOPT_SEC               IPOPT_SECURITY
 242 #define IPOPT_LSRR              131             /* loose source route */
 243 #define IPOPT_SATID             136             /* satnet id */
 244 #define IPOPT_SID               IPOPT_SATID
 245 #define IPOPT_SSRR              137             /* strict source route */
 246 #define IPOPT_RA                148             /* router alert */
 247
 248 /*
 249  * Offsets to fields in options other than EOL and NOP.
 250  */
 251 #define IPOPT_OPTVAL            0               /* option ID */
 252 #define IPOPT_OLEN              1               /* option length */
 253 #define IPOPT_OFFSET            2               /* offset within option */
 254 #define IPOPT_MINOFF            4               /* min value of above */
 255
 256 #define MAX_IPOPTLEN            40
 257
 258 /* flag bits for ipt_flg */
 259 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 260 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 261 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 262
 263 /* bits for security (not byte swapped) */
 264 #define IPOPT_SECUR_UNCLASS     0x0000
 265 #define IPOPT_SECUR_CONFID      0xf135
 266 #define IPOPT_SECUR_EFTO        0x789a
 267 #define IPOPT_SECUR_MMMM        0xbc4d
 268 #define IPOPT_SECUR_RESTR       0xaf13
 269 #define IPOPT_SECUR_SECRET      0xd788
 270 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 271
 272 /*
 273  * Internet implementation parameters.
 274  */
 275 #define MAXTTL          255             /* maximum time to live (seconds) */
 276 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 277 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 278 #define IPTTLDEC        1               /* subtracted when forwarding */
 279
 280 #define IP_MSS          576             /* default maximum segment size */
 281
 282 __END_DECLS
 283
 284 #endif /* netinet/ip.h */