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/* 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 */