sysdeps/unix/sysv/linux/netinet/ip.h

   1 /* Copyright (C) 1991, 92, 93, 95, 96, 97, 98 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  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 ip_options
  46   {
  47     u_int32_t faddr;            /* Saved first hop address */
  48     u_int8_t optlen;
  49     u_int8_t srr;
  50     u_int8_t rr;
  51     u_int8_t ts;
  52     unsigned int is_setbyuser:1;   /* Set by setsockopt?                  */
  53     unsigned int is_data:1;        /* Options in __data, rather than skb  */
  54     unsigned int is_strictroute:1; /* Strict source route                 */
  55     unsigned int srr_is_hit:1;     /* Packet destination addr was our one */
  56     unsigned int is_changed:1;     /* IP checksum more not valid          */
  57     unsigned int rr_needaddr:1;    /* Need to record addr of outgoing dev */
  58     unsigned int ts_needtime:1;    /* Need to record timestamp            */
  59     unsigned int ts_needaddr:1;    /* Need to record addr of outgoing dev */
  60     u_int8_t router_alert;
  61     u_int8_t __pad1;
  62     u_int8_t __pad2;
  63 #ifdef __GNUC__
  64     u_int8_t __data[0];
  65 #endif
  66   };
  67
  68 struct iphdr
  69   {
  70 #if __BYTE_ORDER == __LITTLE_ENDIAN
  71     unsigned int ihl:4;
  72     unsigned int version:4;
  73 #elif __BYTE_ORDER == __BIG_ENDIAN
  74     unsigned int version:4;
  75     unsigned int ihl:4;
  76 #else
  77 # error "Please fix <bits/endian.h>"
  78 #endif
  79     u_int8_t tos;
  80     u_int16_t tot_len;
  81     u_int16_t id;
  82     u_int16_t frag_off;
  83     u_int8_t ttl;
  84     u_int8_t protocol;
  85     u_int16_t check;
  86     u_int32_t saddr;
  87     u_int32_t daddr;
  88     /*The options start here. */
  89   };
  90
  91 #ifdef __USE_BSD
  92 /*
  93  * Copyright (c) 1982, 1986, 1993
  94  *      The Regents of the University of California.  All rights reserved.
  95  *
  96  * Redistribution and use in source and binary forms, with or without
  97  * modification, are permitted provided that the following conditions
  98  * are met:
  99  * 1. Redistributions of source code must retain the above copyright
 100  *    notice, this list of conditions and the following disclaimer.
 101  * 2. Redistributions in binary form must reproduce the above copyright
 102  *    notice, this list of conditions and the following disclaimer in the
 103  *    documentation and/or other materials provided with the distribution.
 104  * 3. All advertising materials mentioning features or use of this software
 105  *    must display the following acknowledgement:
 106  *      This product includes software developed by the University of
 107  *      California, Berkeley and its contributors.
 108  * 4. Neither the name of the University nor the names of its contributors
 109  *    may be used to endorse or promote products derived from this software
 110  *    without specific prior written permission.
 111  *
 112  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 113  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 114  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 115  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 116  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 117  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 118  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 119  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 120  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 121  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 122  * SUCH DAMAGE.
 123  *
 124  *      @(#)ip.h        8.1 (Berkeley) 6/10/93
 125  */
 126
 127 /*
 128  * Definitions for internet protocol version 4.
 129  * Per RFC 791, September 1981.
 130  */
 131
 132 /*
 133  * Structure of an internet header, naked of options.
 134  */
 135 struct ip
 136   {
 137 #if __BYTE_ORDER == __LITTLE_ENDIAN
 138     unsigned int ip_hl:4;               /* header length */
 139     unsigned int ip_v:4;                /* version */
 140 #endif
 141 #if __BYTE_ORDER == __BIG_ENDIAN
 142     unsigned int ip_v:4;                /* version */
 143     unsigned int ip_hl:4;               /* header length */
 144 #endif
 145     u_int8_t ip_tos;                    /* type of service */
 146     u_short ip_len;                     /* total length */
 147     u_short ip_id;                      /* identification */
 148     u_short ip_off;                     /* fragment offset field */
 149 #define IP_RF 0x8000                    /* reserved fragment flag */
 150 #define IP_DF 0x4000                    /* dont fragment flag */
 151 #define IP_MF 0x2000                    /* more fragments flag */
 152 #define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
 153     u_int8_t ip_ttl;                    /* time to live */
 154     u_int8_t ip_p;                      /* protocol */
 155     u_short ip_sum;                     /* checksum */
 156     struct in_addr ip_src, ip_dst;      /* source and dest address */
 157   };
 158
 159 /*
 160  * Time stamp option structure.
 161  */
 162 struct ip_timestamp
 163   {
 164     u_int8_t ipt_code;                  /* IPOPT_TS */
 165     u_int8_t ipt_len;                   /* size of structure (variable) */
 166     u_int8_t ipt_ptr;                   /* index of current entry */
 167 #if __BYTE_ORDER == __LITTLE_ENDIAN
 168     unsigned int ipt_flg:4;             /* flags, see below */
 169     unsigned int ipt_oflw:4;            /* overflow counter */
 170 #endif
 171 #if __BYTE_ORDER == __BIG_ENDIAN
 172     unsigned int ipt_oflw:4;            /* overflow counter */
 173     unsigned int ipt_flg:4;             /* flags, see below */
 174 #endif
 175     u_int32_t data[9];
 176   };
 177 #endif /* __USE_BSD */
 178
 179 #define IPVERSION       4               /* IP version number */
 180 #define IP_MAXPACKET    65535           /* maximum packet size */
 181
 182 /*
 183  * Definitions for IP type of service (ip_tos)
 184  */
 185 #define IPTOS_TOS_MASK          0x1E
 186 #define IPTOS_TOS(tos)          ((tos) & IPTOS_TOS_MASK)
 187 #define IPTOS_LOWDELAY          0x10
 188 #define IPTOS_THROUGHPUT        0x08
 189 #define IPTOS_RELIABILITY       0x04
 190 #define IPTOS_LOWCOST           0x02
 191 #define IPTOS_MINCOST           IPTOS_LOWCOST
 192
 193 /*
 194  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
 195  */
 196 #define IPTOS_PREC_MASK                 0xe0
 197 #define IPTOS_PREC(tos)                ((tos) & IPTOS_PREC_MASK)
 198 #define IPTOS_PREC_NETCONTROL           0xe0
 199 #define IPTOS_PREC_INTERNETCONTROL      0xc0
 200 #define IPTOS_PREC_CRITIC_ECP           0xa0
 201 #define IPTOS_PREC_FLASHOVERRIDE        0x80
 202 #define IPTOS_PREC_FLASH                0x60
 203 #define IPTOS_PREC_IMMEDIATE            0x40
 204 #define IPTOS_PREC_PRIORITY             0x20
 205 #define IPTOS_PREC_ROUTINE              0x00
 206
 207 /*
 208  * Definitions for options.
 209  */
 210 #define IPOPT_COPY              0x80
 211 #define IPOPT_CLASS_MASK        0x60
 212 #define IPOPT_NUMBER_MASK       0x1f
 213
 214 #define IPOPT_COPIED(o)         ((o) & IPOPT_COPY)
 215 #define IPOPT_CLASS(o)          ((o) & IPOPT_CLASS_MASK)
 216 #define IPOPT_NUMBER(o)         ((o) & IPOPT_NUMBER_MASK)
 217
 218 #define IPOPT_CONTROL           0x00
 219 #define IPOPT_RESERVED1         0x20
 220 #define IPOPT_DEBMEAS           0x40
 221 #define IPOPT_MEASUREMENT       IPOPT_DEBMEAS
 222 #define IPOPT_RESERVED2         0x60
 223
 224 #define IPOPT_EOL               0               /* end of option list */
 225 #define IPOPT_END               IPOPT_EOL
 226 #define IPOPT_NOP               1               /* no operation */
 227 #define IPOPT_NOOP              IP_NOP
 228
 229 #define IPOPT_RR                7               /* record packet route */
 230 #define IPOPT_TS                68              /* timestamp */
 231 #define IPOPT_TIMESTAMP         IPOPT_TS
 232 #define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
 233 #define IPOPT_SEC               IPOPT_SECURITY
 234 #define IPOPT_LSRR              131             /* loose source route */
 235 #define IPOPT_SATID             136             /* satnet id */
 236 #define IPOPT_SID               IPOPT_SATID
 237 #define IPOPT_SSRR              137             /* strict source route */
 238 #define IPOPT_RA                148             /* router alert */
 239
 240 /*
 241  * Offsets to fields in options other than EOL and NOP.
 242  */
 243 #define IPOPT_OPTVAL            0               /* option ID */
 244 #define IPOPT_OLEN              1               /* option length */
 245 #define IPOPT_OFFSET            2               /* offset within option */
 246 #define IPOPT_MINOFF            4               /* min value of above */
 247
 248 #define MAX_IPOPTLEN            40
 249
 250 /* flag bits for ipt_flg */
 251 #define IPOPT_TS_TSONLY         0               /* timestamps only */
 252 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 253 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 254
 255 /* bits for security (not byte swapped) */
 256 #define IPOPT_SECUR_UNCLASS     0x0000
 257 #define IPOPT_SECUR_CONFID      0xf135
 258 #define IPOPT_SECUR_EFTO        0x789a
 259 #define IPOPT_SECUR_MMMM        0xbc4d
 260 #define IPOPT_SECUR_RESTR       0xaf13
 261 #define IPOPT_SECUR_SECRET      0xd788
 262 #define IPOPT_SECUR_TOPSECRET   0x6bc5
 263
 264 /*
 265  * Internet implementation parameters.
 266  */
 267 #define MAXTTL          255             /* maximum time to live (seconds) */
 268 #define IPDEFTTL        64              /* default ttl, from RFC 1340 */
 269 #define IPFRAGTTL       60              /* time to live for frags, slowhz */
 270 #define IPTTLDEC        1               /* subtracted when forwarding */
 271
 272 #define IP_MSS          576             /* default maximum segment size */
 273
 274 __END_DECLS
 275
 276 #endif /* netinet/ip.h */