/* 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_DECLSstruct 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 */