/* Copyright (C) 1991-2018 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, see

   <http://www.gnu.org/licenses/>.  */

#ifndef __NETINET_IP_H

#define __NETINET_IP_H 1

#include <features.h>

#include <sys/types.h>

#include <netinet/in.h>

__BEGIN_DECLS

struct timestamp

  {

    uint8_t len;

    uint8_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

    uint32_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

    uint8_t tos;

    uint16_t tot_len;

    uint16_t id;

    uint16_t frag_off;

    uint8_t ttl;

    uint8_t protocol;

    uint16_t check;

    uint32_t saddr;

    uint32_t daddr;

    /*The options start here. */

  };

#ifdef __USE_MISC

/*

 * 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

    uint8_t ip_tos;			/* type of service */

    unsigned short ip_len;		/* total length */

    unsigned short ip_id;		/* identification */

    unsigned 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 */

    uint8_t ip_ttl;			/* time to live */

    uint8_t ip_p;			/* protocol */

    unsigned short ip_sum;		/* checksum */

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

  };

/*

 * Time stamp option structure.

 */

struct ip_timestamp

  {

    uint8_t ipt_code;			/* IPOPT_TS */

    uint8_t ipt_len;			/* size of structure (variable) */

    uint8_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

    uint32_t data[9];

  };

#endif /* __USE_MISC */

#define	IPVERSION	4               /* IP version number */

#define	IP_MAXPACKET	65535		/* maximum packet size */

/*

 * Definitions for Explicit Congestion Notification (ECN)

 *

 * Taken from RFC-3168, Section 5.

 */

#define	IPTOS_ECN_MASK		0x03

#define	IPTOS_ECN(x)		((x) & IPTOS_ECN_MASK)

#define	IPTOS_ECN_NOT_ECT	0x00

#define	IPTOS_ECN_ECT1		0x01

#define	IPTOS_ECN_ECT0		0x02

#define	IPTOS_ECN_CE		0x03

/*

 * Definitions for IP differentiated services code points (DSCP)

 *

 * Taken from RFC-2597, Section 6 and RFC-2598, Section 2.3.

 */

#define	IPTOS_DSCP_MASK		0xfc

#define	IPTOS_DSCP(x)		((x) & IPTOS_DSCP_MASK)

#define	IPTOS_DSCP_AF11		0x28

#define	IPTOS_DSCP_AF12		0x30

#define	IPTOS_DSCP_AF13		0x38

#define	IPTOS_DSCP_AF21		0x48

#define	IPTOS_DSCP_AF22		0x50

#define	IPTOS_DSCP_AF23		0x58

#define	IPTOS_DSCP_AF31		0x68

#define	IPTOS_DSCP_AF32		0x70

#define	IPTOS_DSCP_AF33		0x78

#define	IPTOS_DSCP_AF41		0x88

#define	IPTOS_DSCP_AF42		0x90

#define	IPTOS_DSCP_AF43		0x98

#define	IPTOS_DSCP_EF		0xb8

/*

 * In RFC 2474, Section 4.2.2.1, the Class Selector Codepoints subsume

 * the old ToS Precedence values.

 */

#define	IPTOS_CLASS_MASK		0xe0

#define	IPTOS_CLASS(class)		((class) & IPTOS_CLASS_MASK)

#define	IPTOS_CLASS_CS0			0x00

#define	IPTOS_CLASS_CS1			0x20

#define	IPTOS_CLASS_CS2			0x40

#define	IPTOS_CLASS_CS3			0x60

#define	IPTOS_CLASS_CS4			0x80

#define	IPTOS_CLASS_CS5			0xa0

#define	IPTOS_CLASS_CS6			0xc0

#define	IPTOS_CLASS_CS7			0xe0

#define	IPTOS_CLASS_DEFAULT		IPTOS_CLASS_CS0

/*

 * Definitions for IP type of service (ip_tos) [deprecated; use DSCP

 * and CS definitions above instead.]

 */

#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) [also deprecated.]

 */

#define	IPTOS_PREC_MASK			IPTOS_CLASS_MASK

#define	IPTOS_PREC(tos)			IPTOS_CLASS(tos)

#define	IPTOS_PREC_NETCONTROL		IPTOS_CLASS_CS7

#define	IPTOS_PREC_INTERNETCONTROL	IPTOS_CLASS_CS6

#define	IPTOS_PREC_CRITIC_ECP		IPTOS_CLASS_CS5

#define	IPTOS_PREC_FLASHOVERRIDE	IPTOS_CLASS_CS4

#define	IPTOS_PREC_FLASH		IPTOS_CLASS_CS3

#define	IPTOS_PREC_IMMEDIATE		IPTOS_CLASS_CS2

#define	IPTOS_PREC_PRIORITY		IPTOS_CLASS_CS1

#define	IPTOS_PREC_ROUTINE		IPTOS_CLASS_CS0

/*

 * 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 */