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ip.h

/* Copyright (C) 1991,92,93,95,96,97,98,99,2000 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef __NETINET_IP_H
#define __NETINET_IP_H 1

#include <features.h>
#include <sys/types.h>

#include <netinet/in.h>

__BEGIN_DECLS

struct timestamp
  {
    u_int8_t len;
    u_int8_t ptr;
#if __BYTE_ORDER == __LITTLE_ENDIAN
    unsigned int flags:4;
    unsigned int overflow:4;
#elif __BYTE_ORDER == __BIG_ENDIAN
    unsigned int overflow:4;
    unsigned int flags:4;
#else
# error     "Please fix <bits/endian.h>"
#endif
    u_int32_t data[9];
  };

struct iphdr
  {
#if __BYTE_ORDER == __LITTLE_ENDIAN
    unsigned int ihl:4;
    unsigned int version:4;
#elif __BYTE_ORDER == __BIG_ENDIAN
    unsigned int version:4;
    unsigned int ihl:4;
#else
# error     "Please fix <bits/endian.h>"
#endif
    u_int8_t tos;
    u_int16_t tot_len;
    u_int16_t id;
    u_int16_t frag_off;
    u_int8_t ttl;
    u_int8_t protocol;
    u_int16_t check;
    u_int32_t saddr;
    u_int32_t daddr;
    /*The options start here. */
  };

#ifdef __USE_BSD
/*
 * Copyright (c) 1982, 1986, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *    @(#)ip.h    8.1 (Berkeley) 6/10/93
 */

/*
 * Definitions for internet protocol version 4.
 * Per RFC 791, September 1981.
 */

/*
 * Structure of an internet header, naked of options.
 */
struct ip
  {
#if __BYTE_ORDER == __LITTLE_ENDIAN
    unsigned int ip_hl:4;           /* header length */
    unsigned int ip_v:4;            /* version */
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
    unsigned int ip_v:4;            /* version */
    unsigned int ip_hl:4;           /* header length */
#endif
    u_int8_t ip_tos;                /* type of service */
    u_short ip_len;                 /* total length */
    u_short ip_id;                  /* identification */
    u_short ip_off;                 /* fragment offset field */
#define     IP_RF 0x8000                  /* reserved fragment flag */
#define     IP_DF 0x4000                  /* dont fragment flag */
#define     IP_MF 0x2000                  /* more fragments flag */
#define     IP_OFFMASK 0x1fff       /* mask for fragmenting bits */
    u_int8_t ip_ttl;                /* time to live */
    u_int8_t ip_p;                  /* protocol */
    u_short ip_sum;                 /* checksum */
    struct in_addr ip_src, ip_dst;  /* source and dest address */
  };

/*
 * Time stamp option structure.
 */
struct ip_timestamp
  {
    u_int8_t ipt_code;              /* IPOPT_TS */
    u_int8_t ipt_len;               /* size of structure (variable) */
    u_int8_t ipt_ptr;               /* index of current entry */
#if __BYTE_ORDER == __LITTLE_ENDIAN
    unsigned int ipt_flg:4;         /* flags, see below */
    unsigned int ipt_oflw:4;        /* overflow counter */
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
    unsigned int ipt_oflw:4;        /* overflow counter */
    unsigned int ipt_flg:4;         /* flags, see below */
#endif
    u_int32_t data[9];
  };
#endif /* __USE_BSD */

#define     IPVERSION   4               /* IP version number */
#define     IP_MAXPACKET      65535       /* maximum packet size */

/*
 * Definitions for IP type of service (ip_tos)
 */
#define     IPTOS_TOS_MASK          0x1E
#define     IPTOS_TOS(tos)          ((tos) & IPTOS_TOS_MASK)
#define     IPTOS_LOWDELAY          0x10
#define     IPTOS_THROUGHPUT  0x08
#define     IPTOS_RELIABILITY 0x04
#define     IPTOS_LOWCOST           0x02
#define     IPTOS_MINCOST           IPTOS_LOWCOST

/*
 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
 */
#define     IPTOS_PREC_MASK               0xe0
#define     IPTOS_PREC(tos)                ((tos) & IPTOS_PREC_MASK)
#define     IPTOS_PREC_NETCONTROL         0xe0
#define     IPTOS_PREC_INTERNETCONTROL    0xc0
#define     IPTOS_PREC_CRITIC_ECP         0xa0
#define     IPTOS_PREC_FLASHOVERRIDE      0x80
#define     IPTOS_PREC_FLASH        0x60
#define     IPTOS_PREC_IMMEDIATE          0x40
#define     IPTOS_PREC_PRIORITY           0x20
#define     IPTOS_PREC_ROUTINE            0x00

/*
 * Definitions for options.
 */
#define     IPOPT_COPY        0x80
#define     IPOPT_CLASS_MASK  0x60
#define     IPOPT_NUMBER_MASK 0x1f

#define     IPOPT_COPIED(o)         ((o) & IPOPT_COPY)
#define     IPOPT_CLASS(o)          ((o) & IPOPT_CLASS_MASK)
#define     IPOPT_NUMBER(o)         ((o) & IPOPT_NUMBER_MASK)

#define     IPOPT_CONTROL           0x00
#define     IPOPT_RESERVED1         0x20
#define     IPOPT_DEBMEAS           0x40
#define     IPOPT_MEASUREMENT       IPOPT_DEBMEAS
#define     IPOPT_RESERVED2         0x60

#define     IPOPT_EOL         0           /* end of option list */
#define     IPOPT_END         IPOPT_EOL
#define     IPOPT_NOP         1           /* no operation */
#define     IPOPT_NOOP        IPOPT_NOP

#define     IPOPT_RR          7           /* record packet route */
#define     IPOPT_TS          68          /* timestamp */
#define     IPOPT_TIMESTAMP         IPOPT_TS
#define     IPOPT_SECURITY          130         /* provide s,c,h,tcc */
#define     IPOPT_SEC         IPOPT_SECURITY
#define     IPOPT_LSRR        131         /* loose source route */
#define     IPOPT_SATID       136         /* satnet id */
#define     IPOPT_SID         IPOPT_SATID
#define     IPOPT_SSRR        137         /* strict source route */
#define     IPOPT_RA          148         /* router alert */

/*
 * Offsets to fields in options other than EOL and NOP.
 */
#define     IPOPT_OPTVAL            0           /* option ID */
#define     IPOPT_OLEN        1           /* option length */
#define     IPOPT_OFFSET            2           /* offset within option */
#define     IPOPT_MINOFF            4           /* min value of above */

#define     MAX_IPOPTLEN            40

/* flag bits for ipt_flg */
#define     IPOPT_TS_TSONLY         0           /* timestamps only */
#define     IPOPT_TS_TSANDADDR      1           /* timestamps and addresses */
#define     IPOPT_TS_PRESPEC  3           /* specified modules only */

/* bits for security (not byte swapped) */
#define     IPOPT_SECUR_UNCLASS     0x0000
#define     IPOPT_SECUR_CONFID      0xf135
#define     IPOPT_SECUR_EFTO  0x789a
#define     IPOPT_SECUR_MMMM  0xbc4d
#define     IPOPT_SECUR_RESTR 0xaf13
#define     IPOPT_SECUR_SECRET      0xd788
#define     IPOPT_SECUR_TOPSECRET   0x6bc5

/*
 * Internet implementation parameters.
 */
#define     MAXTTL            255         /* maximum time to live (seconds) */
#define     IPDEFTTL    64          /* default ttl, from RFC 1340 */
#define     IPFRAGTTL   60          /* time to live for frags, slowhz */
#define     IPTTLDEC    1           /* subtracted when forwarding */

#define     IP_MSS            576         /* default maximum segment size */

__END_DECLS

#endif /* netinet/ip.h */

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