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/*

 * 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        8.2 (Berkeley) 6/1/94

 * $FreeBSD: src/sys/netinet/ip.h,v 1.19 2001/12/14 19:37:32 rwatson Exp $

 */

#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 {

#ifdef _IP_VHL

        u_char  ip_vhl;                 /* version << 4 | header length >> 2 */

#else

#if BYTE_ORDER == LITTLE_ENDIAN

        u_int   ip_hl:4,                /* header length */

                ip_v:4;                 /* version */

#endif

#if BYTE_ORDER == BIG_ENDIAN

        u_int   ip_v:4,                 /* version */

                ip_hl:4;                /* header length */

#endif

#endif /* not _IP_VHL */

        u_char  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_char  ip_ttl;                 /* time to live */

        u_char  ip_p;                   /* protocol */

        u_short ip_sum;                 /* checksum */

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

};

#ifdef _IP_VHL

#define IP_MAKE_VHL(v, hl)      ((v) << 4 | (hl))

#define IP_VHL_HL(vhl)          ((vhl) & 0x0f)

#define IP_VHL_V(vhl)           ((vhl) >> 4)

#define IP_VHL_BORING           0x45

#endif

#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

#define IPTOS_MINCOST           0x02

/* ECN bits proposed by Sally Floyd */

#define IPTOS_CE                0x01    /* congestion experienced */

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

/*

 * 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_ESO               133             /* extended security */

#define IPOPT_CIPSO             134             /* commerical security */

#define IPOPT_SATID             136             /* satnet id */

#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 */

/*

 * Time stamp option structure.

 */

struct  ip_timestamp {

        u_char  ipt_code;               /* IPOPT_TS */

        u_char  ipt_len;                /* size of structure (variable) */

        u_char  ipt_ptr;                /* index of current entry */

#if BYTE_ORDER == LITTLE_ENDIAN

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

                ipt_oflw:4;             /* overflow counter */

#endif

#if BYTE_ORDER == BIG_ENDIAN

        u_int   ipt_oflw:4,             /* overflow counter */

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

#endif

        union ipt_timestamp {

                n_long  ipt_time[1];

                struct  ipt_ta {

                        struct in_addr ipt_addr;

                        n_long ipt_time;

                } ipt_ta[1];

        } ipt_timestamp;

};

/* 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 */

#endif