/*
 * 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. 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 $
 */

/* Copied from Linux, modified for Phoenix-RTOS. */

#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
