sysdeps/generic/netinet/ip.h

   1 /* Copyright (C) 1991-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef __NETINET_IP_H
  19 #define __NETINET_IP_H 1
  20
  21 #include <features.h>
  22 #include <sys/types.h>
  23
  24 #include <netinet/in.h>
  25
  26 __BEGIN_DECLS
  27
  28 struct timestamp
  29   {
  30     u_int8_t len;
  31     u_int8_t ptr;
  32 #if __BYTE_ORDER == __LITTLE_ENDIAN
  33     unsigned int flags:4;
  34     unsigned int overflow:4;
  35 #elif __BYTE_ORDER == __BIG_ENDIAN
  36     unsigned int overflow:4;
  37     unsigned int flags:4;
  38 #else
  39 # error "Please fix <bits/endian.h>"
  40 #endif
  41     u_int32_t data[9];
  42   };
  43
  44 struct iphdr
  45   {
  46 #if __BYTE_ORDER == __LITTLE_ENDIAN
  47     unsigned int ihl:4;
  48     unsigned int version:4;
  49 #elif __BYTE_ORDER == __BIG_ENDIAN
  50     unsigned int version:4;
  51     unsigned int ihl:4;
  52 #else
  53 # error "Please fix <bits/endian.h>"
  54 #endif
  55     u_int8_t tos;
  56     u_int16_t tot_len;
  57     u_int16_t id;
  58     u_int16_t frag_off;
  59     u_int8_t ttl;
  60     u_int8_t protocol;
  61     u_int16_t check;
  62     u_int32_t saddr;
  63     u_int32_t daddr;
  64     /*The options start here. */
  65   };
  66
  67 #ifdef __USE_BSD
  68 /*
  69  * Copyright (c) 1982, 1986, 1993
  70  *      The Regents of the University of California.  All rights reserved.
  71  *
  72  * Redistribution and use in source and binary forms, with or without
  73  * modification, are permitted provided that the following conditions
  74  * are met:
  75  * 1. Redistributions of source code must retain the above copyright
  76  *    notice, this list of conditions and the following disclaimer.
  77  * 2. Redistributions in binary form must reproduce the above copyright
  78  *    notice, this list of conditions and the following disclaimer in the
  79  *    documentation and/or other materials provided with the distribution.
  80  * 4. Neither the name of the University nor the names of its contributors
  81  *    may be used to endorse or promote products derived from this software
  82  *    without specific prior written permission.
  83  *
  84  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  85  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  86  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  87  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  88  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  89  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  90  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  91  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  92  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  93  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  94  * SUCH DAMAGE.
  95  *
  96  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
  97  */
  98
  99 /*
 100  * Definitions for internet protocol version 4.
 101  * Per RFC 791, September 1981.
 102  */
 103
 104 /*
 105  * Structure of an internet header, naked of options.
 106  */
 107 struct ip
 108   {
 109 #if __BYTE_ORDER == __LITTLE_ENDIAN
 110     unsigned int ip_hl:4;               /* header length */
 111     unsigned int ip_v:4;                /* version */
 112 #endif
 113 #if __BYTE_ORDER == __BIG_ENDIAN
 114     unsigned int ip_v:4;                /* version */
 115     unsigned int ip_hl:4;               /* header length */
 116 #endif
 117     u_int8_t ip_tos;                    /* type of service */
 118     u_short ip_len;                     /* total length */
 119     u_short ip_id;                      /* identification */
 120     u_short ip_off;                     /* fragment offset field */
 121 #define IP_RF 0x8000                    /* reserved fragment flag */
 122 #define IP_DF 0x4000                    /* dont fragment flag */
 123 #define IP_MF 0x2000                    /* more fragments flag */
 124 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
 125     u_int8_t ip_ttl;                    /* time to live */
 126     u_int8_t ip_p;                      /* protocol */
 127     u_short ip_sum;                     /* checksum */
 128     struct in_addr ip_src, ip_dst;      /* source and dest address */
 129   };
 130
 131 /*
 132  * Time stamp option structure.
 133  */
 134 struct ip_timestamp
 135   {
 136     u_int8_t ipt_code;                  /* IPOPT_TS */
 137     u_int8_t ipt_len;                   /* size of structure (variable) */
 138     u_int8_t ipt_ptr;                   /* index of current entry */
 139 #if __BYTE_ORDER == __LITTLE_ENDIAN
 140     unsigned int ipt_flg:4;             /* flags, see below */
 141     unsigned int ipt_oflw:4;            /* overflow counter */
 142 #endif
 143 #if __BYTE_ORDER == __BIG_ENDIAN
 144     unsigned int ipt_oflw:4;            /* overflow counter */
 145     unsigned int ipt_flg:4;             /* flags, see below */
 146 #endif
 147     u_int32_t data[9];
 148   };
 149 #endif /* __USE_BSD */
 150
 151 #define IPVERSION       4               /* IP version number */
 152 #define IP_MAXPACKET    65535           /* maximum packet size */
 153
 154 /*
 155  * Definitions for Explicit Congestion Notification (ECN)
 156  *
 157  * Taken from RFC-3168, Section 5.
 158  */
 159
 160 #define IPTOS_ECN_MASK          0x03
 161 #define IPTOS_ECN(x)            ((x) & IPTOS_ECN_MASK)
 162 #define IPTOS_ECN_NOT_ECT       0x00
 163 #define IPTOS_ECN_ECT1          0x01
 164 #define IPTOS_ECN_ECT0          0x02
 165 #define IPTOS_ECN_CE            0x03
 166
 167 /*
 168  * Definitions for IP differentiated services code points (DSCP)
 169  *
 170  * Taken from RFC-2597, Section 6 and RFC-2598, Section 2.3.
 171  */
 172
 173 #define IPTOS_DSCP_MASK         0xfc
 174 #define IPTOS_DSCP(x)           ((x) & IPTOS_DSCP_MASK)
 175 #define IPTOS_DSCP_AF11         0x28
 176 #define IPTOS_DSCP_AF12         0x30
 177 #define IPTOS_DSCP_AF13         0x38
 178 #define IPTOS_DSCP_AF21         0x48
 179 #define IPTOS_DSCP_AF22         0x50
 180 #define IPTOS_DSCP_AF23         0x58
 181 #define IPTOS_DSCP_AF31         0x68
 182 #define IPTOS_DSCP_AF32         0x70
 183 #define IPTOS_DSCP_AF33         0x78
 184 #define IPTOS_DSCP_AF41         0x88
 185 #define IPTOS_DSCP_AF42         0x90
 186 #define IPTOS_DSCP_AF43         0x98
 187 #define IPTOS_DSCP_EF           0xb8
 188
 189 /*
 190  * In RFC 2474, Section 4.2.2.1, the Class Selector Codepoints subsume
 191  * the old ToS Precedence values.
 192  */
 193
 194 #define IPTOS_CLASS_MASK                0xe0
 195 #define IPTOS_CLASS(class)              ((class) & IPTOS_CLASS_MASK)
 196 #define IPTOS_CLASS_CS0                 0x00
 197 #define IPTOS_CLASS_CS1                 0x20
 198 #define IPTOS_CLASS_CS2                 0x40
 199 #define IPTOS_CLASS_CS3                 0x60
 200 #define IPTOS_CLASS_CS4                 0x80
 201 #define IPTOS_CLASS_CS5                 0xa0
 202 #define IPTOS_CLASS_CS6                 0xc0
 203 #define IPTOS_CLASS_CS7                 0xe0
 204
 205 #define IPTOS_CLASS_DEFAULT             IPTOS_CLASS_CS0
 206
 207 /*
 208  * Definitions for IP type of service (ip_tos) [deprecated; use DSCP
 209  * and CS definitions above instead.]
 210  */
 211 #define IPTOS_TOS_MASK          0x1E
 212 #define IPTOS_TOS(tos)          ((tos) & IPTOS_TOS_MASK)
 213 #define IPTOS_LOWDELAY          0x10
 214 #define IPTOS_THROUGHPUT        0x08
 215 #define IPTOS_RELIABILITY       0x04
 216 #define IPTOS_LOWCOST           0x02
 217 #define IPTOS_MINCOST           IPTOS_LOWCOST
 218
 219 /*
 220  * Definitions for IP precedence (also in ip_tos) [also deprecated.]
 221  */
 222 #define IPTOS_PREC_MASK                 IPTOS_CLASS_MASK
 223 #define IPTOS_PREC(tos)                 IPTOS_CLASS(tos)
 224 #define IPTOS_PREC_NETCONTROL           IPTOS_CLASS_CS7
 225 #define IPTOS_PREC_INTERNETCONTROL      IPTOS_CLASS_CS6
 226 #define IPTOS_PREC_CRITIC_ECP           IPTOS_CLASS_CS5
 227 #define IPTOS_PREC_FLASHOVERRIDE        IPTOS_CLASS_CS4
 228 #define IPTOS_PREC_FLASH                IPTOS_CLASS_CS3
 229 #define IPTOS_PREC_IMMEDIATE            IPTOS_CLASS_CS2
 230 #define IPTOS_PREC_PRIORITY             IPTOS_CLASS_CS1
 231 #define IPTOS_PREC_ROUTINE              IPTOS_CLASS_CS0
 232
 233 /*
 234  * Definitions for options.
 235  */
 236 #define IPOPT_COPY              0x80
 237 #define IPOPT_CLASS_MASK        0x60
 238 #define IPOPT_NUMBER_MASK       0x1f
 239
 240 #define IPOPT_COPIED(o)         ((o) & IPOPT_COPY)
 241 #define IPOPT_CLASS(o)          ((o) & IPOPT_CLASS_MASK)
 242 #define IPOPT_NUMBER(o)         ((o) & IPOPT_NUMBER_MASK)
 243
 244 #define IPOPT_CONTROL           0x00
 245 #define IPOPT_RESERVED1         0x20
 246 #define IPOPT_DEBMEAS           0x40
 247 #define IPOPT_MEASUREMENT       IPOPT_DEBMEAS
 248 #define IPOPT_RESERVED2         0x60
 249
 250 #define IPOPT_EOL               0               /* end of option list */
 251 #define IPOPT_END               IPOPT_EOL
 252 #define IPOPT_NOP               1               /* no operation */
 253 #define IPOPT_NOOP              IPOPT_NOP
 254
 255 #define IPOPT_RR                7               /* record packet route */
 256 #define IPOPT_TS                68              /* timestamp */
 257 #define IPOPT_TIMESTAMP         IPOPT_TS
 258 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 259 #define IPOPT_SEC               IPOPT_SECURITY
 260 #define IPOPT_LSRR              131             /* loose source route */
 261 #define IPOPT_SATID             136             /* satnet id */
 262 #define IPOPT_SID               IPOPT_SATID
 263 #define IPOPT_SSRR              137             /* strict source route */
 264 #define IPOPT_RA                148             /* router alert */
 265
 266 /*
 267  * Offsets to fields in options other than EOL and NOP.
 268  */
 269 #define IPOPT_OPTVAL            0               /* option ID */
 270 #define IPOPT_OLEN              1               /* option length */
 271 #define IPOPT_OFFSET            2               /* offset within option */
 272 #define IPOPT_MINOFF            4               /* min value of above */
 273
 274 #define MAX_IPOPTLEN            40
 275
 276 /* flag bits for ipt_flg */
 277 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 278 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 279 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 280
 281 /* bits for security (not byte swapped) */
 282 #define IPOPT_SECUR_UNCLASS     0x0000
 283 #define IPOPT_SECUR_CONFID      0xf135
 284 #define IPOPT_SECUR_EFTO        0x789a
 285 #define IPOPT_SECUR_MMMM        0xbc4d
 286 #define IPOPT_SECUR_RESTR       0xaf13
 287 #define IPOPT_SECUR_SECRET      0xd788
 288 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 289
 290 /*
 291  * Internet implementation parameters.
 292  */
 293 #define MAXTTL          255             /* maximum time to live (seconds) */
 294 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 295 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 296 #define IPTTLDEC        1               /* subtracted when forwarding */
 297
 298 #define IP_MSS          576             /* default maximum segment size */
 299
 300 __END_DECLS
 301
 302 #endif /* netinet/ip.h */