netiphdr.h

UCOS-ii对于网络的支持代码

/*****************************************************************************
* netiphdr.h - Network Internet Protocol Header header file.
*
* portions Copyright (c) 1998 Global Election Systems Inc.
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice and the following disclaimer are included verbatim in any 
* distributions. No written agreement, license, or royalty fee is required
* for any of the authorized uses.
*
* THIS SOFTWARE IS PROVIDED BY THE 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 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.
*
******************************************************************************
* REVISION HISTORY
*
* 98-01-21 Guy Lancaster <[e-mail]>, Global Election Systems Inc.
*	Original derived from BSD codes.
*****************************************************************************/
/*
 * 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
 */

#ifndef NETIPHDR_H
#define NETIPHDR_H

/*************************
*** PUBLIC DEFINITIONS ***
*************************/

/*
 * Definitions for internet protocol version 4.
 * Per RFC 791, September 1981.
 */
#define	IPVERSION	4


/*
 * Type Of Service fields.
 */
#define IPTOS_MASK			0x1E			/* 4th thru 7th bits are TOS. */
#define IPTOS_PREC_MASK		0xE0			/* Upper 3 bits of TOS are precedence. */
#define	IPTOS_PREC(x)		(((x)>>5) & 7)

/*
 * Definitions for IP type of service (ip_tos)
 */
#define	IPTOS_LOWDELAY		0x10
#define	IPTOS_THROUGHPUT	0x08
#define	IPTOS_RELIABILITY	0x04
#define IPTOS_COST			0x01

/*
 * Definitions for IP precedence 
 */
#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 */

/* 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 */



/************************
*** PUBLIC DATA TYPES ***
************************/
/*
 * Structure of an internet header, naked of options.
 *
 * We declare ip_len and ip_off to be short, rather than u_short
 * pragmatically since otherwise unsigned comparisons can result
 * against negative integers quite easily, and fail in subtle ways.
 */
typedef struct ip {
#if BYTE_ORDER == LITTLE_ENDIAN 
	u_char	ip_hl:4,				/* header length */
		ip_v:4;						/* version */
#elif BYTE_ORDER == BIG_ENDIAN 
	u_char	ip_v:4,					/* version */
		ip_hl:4;					/* header length */
#else
	COMPLAIN - NO BYTE ORDER SELECTED!
#endif
	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_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 */
} IPHdr;

/*
 * 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_char	ipt_flg:4,				/* flags, see below */
		ipt_oflw:4;					/* overflow counter */
#endif
#if BYTE_ORDER == BIG_ENDIAN 
	u_char	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;
};

/*
 * Overlay for ip header used by other protocols (tcp, udp).
 */
struct ipovly {
	caddr_t	ih_next, ih_prev;	/* for protocol sequence q's */
	u_char	ih_x1;				/* (unused) */
	u_char	ih_pr;				/* protocol */
	short	ih_len;				/* protocol length */
	struct	in_addr ih_src;		/* source internet address */
	struct	in_addr ih_dst;		/* destination internet address */
};


#endif