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//==========================================================================

//

//      include/netinet/ip.h

//

//      

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD or other sources,

// and are covered by the appropriate copyright disclaimers included herein.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas

// Date:         2000-01-10

// Purpose:      

// Description:  

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

/*      $OpenBSD: ip.h,v 1.6 1999/12/08 06:50:19 itojun Exp $   */

/*      $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $       */

/*

 * 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.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 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

 */

#ifndef _NETINET_IP_H_

#define _NETINET_IP_H_

#include <netinet/in_systm.h>

/*

 * Definitions for internet protocol version 4.

 * Per RFC 791, September 1981.

 */

#define IPVERSION       4

/*

 * Structure of an internet header, naked of options.

 */

struct ip {

#if BYTE_ORDER == LITTLE_ENDIAN

        u_int8_t  ip_hl:4,              /* header length */

                  ip_v:4;               /* version */

#endif

#if BYTE_ORDER == BIG_ENDIAN

        u_int8_t  ip_v:4,               /* version */

                  ip_hl:4;              /* header length */

#endif

        u_int8_t  ip_tos;               /* type of service */

        u_int16_t ip_len;               /* total length */

        u_int16_t ip_id;                /* identification */

        u_int16_t 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_int16_t ip_sum;               /* checksum */

        struct    in_addr ip_src, ip_dst; /* source and dest address */

} __attribute__ ((aligned(1), packed));

#define IP_MAXPACKET    65535           /* maximum packet size */

/*

 * Definitions for IP type of service (ip_tos)

 */

#define IPTOS_LOWDELAY          0x10

#define IPTOS_THROUGHPUT        0x08

#define IPTOS_RELIABILITY       0x04

/*      IPTOS_LOWCOST           0x02 XXX */

#if 1

/* ECN bits proposed by Sally Floyd */

#define IPTOS_CE                0x01    /* congestion experienced */

#define IPTOS_ECT               0x02    /* ECN-capable transport */

#endif

/*

 * Definitions for IP precedence (also in ip_tos) (hopefully unused)

 */

#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_COPIED(o)         ((o)&0x80)

#define IPOPT_CLASS(o)          ((o)&0x60)

#define IPOPT_NUMBER(o)         ((o)&0x1f)

#define IPOPT_CONTROL           0x00

#define IPOPT_RESERVED1         0x20

#define IPOPT_DEBMEAS           0x40

#define IPOPT_RESERVED2         0x60

#define IPOPT_EOL               0                /* end of option list */

#define IPOPT_NOP               1               /* no operation */

#define IPOPT_RR                7               /* record packet route */

#define IPOPT_TS                68              /* timestamp */

#define IPOPT_SECURITY          130             /* provide s,c,h,tcc */

#define IPOPT_LSRR              131             /* loose source route */

#define IPOPT_SATID             136             /* satnet id */

#define IPOPT_SSRR              137             /* strict source route */

/*

 * 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 */

/*

 * 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

        u_int8_t ipt_flg:4,             /* flags, see below */

                 ipt_oflw:4;            /* overflow counter */

#endif

#if BYTE_ORDER == BIG_ENDIAN

        u_int8_t ipt_oflw:4,            /* overflow counter */

                 ipt_flg:4;             /* flags, see below */

#endif

        union ipt_timestamp {

                 n_time ipt_time[1];

                 struct ipt_ta {

                        struct in_addr ipt_addr;

                        n_time ipt_time;

                 } ipt_ta[1];

        } ipt_timestamp;

} __attribute__ ((aligned(1), packed));

/* 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 */

/*

 * This is the real IPv4 psuedo header, used for computing the TCP and UDP

 * checksums. For the Internet checksum, struct ipovly can be used instead.

 * For stronger checksums, the real thing must be used.

 */

struct ippseudo {

        struct    in_addr ippseudo_src; /* source internet address */

        struct    in_addr ippseudo_dst; /* destination internet address */

        u_int8_t  ippseudo_pad;         /* pad, must be zero */

        u_int8_t  ippseudo_p;           /* protocol */

        u_int16_t ippseudo_len;         /* protocol length */

} __attribute__ ((aligned(1), packed));

#endif // _NETINET_IP_H_