/* IP.H

  * 

  * Portions Copyright (c) 1997-1999 Nokia Corporation and/or its subsidiary(-ies).

  * All rights reserved.

  */

 /** @file

 @publishedAll

 @released

 */

 /*

  * Copyright (c) 1982, 1986 Regents of the University of California.

  * All rights reserved.

  *

  * Redistribution and use in source and binary forms are permitted

  * provided that this notice is preserved and that due credit is given

  * to the University of California at Berkeley. The name of the University

  * may not be used to endorse or promote products derived from this

  * software without specific prior written permission. This software

  * is provided ``as is'' without express or implied warranty.

  */

 /*

  * Definitions for internet protocol version 4.

  * Per RFC 791, September 1981.

  */

 #ifndef	_NETINET_IP_H

 #define	_NETINET_IP_H

 #ifdef	__cplusplus

 extern "C" {

 #endif

 #define	IPVERSION	4

 /**

 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.

 */

 struct ip {

 #ifdef _BIT_FIELDS_LTOH

 	u_char	ip_hl:4,		/* header length */

 		ip_v:4;			/* version */

 #else

 	u_char	ip_v:4,			/* version */

 		ip_hl:4;		/* header length */

 #endif

 	u_char	ip_tos;			/* type of service */

 	short	ip_len;			/* total length */

 	u_short	ip_id;			/* identification */

 	short	ip_off;			/* fragment offset field */

 #define	IP_DF 0x4000			/* dont fragment flag */

 #define	IP_MF 0x2000			/* more fragments flag */

 	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 */

 };

 #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

 /**

 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_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 */

 /**

 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 */

 #ifdef _BIT_FIELDS_LTOH

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

 		ipt_oflw:4;		/* overflow counter */

 #else

 	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;

 };

 /**

 flag bits for ipt_flg 

 */

 #define	IPOPT_TS_TSONLY		0		/* timestamps only */

 #define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */

 #define	IPOPT_TS_PRESPEC	2		/* 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	IPFRAGTTL	60		/* time to live for frags, slowhz */

 #define	IPTTLDEC	1		/* subtracted when forwarding */

 #define	IP_MSS		576		/* default maximum segment size */

 #ifdef	__cplusplus

 }

 #endif

 #endif	/* _NETINET_IP_H */