[unix-history] / usr / src / sys / netinet / ip.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)ip.h	7.10 (Berkeley) %G%
 */
#ifndef BYTE_ORDER
/*
 * Definitions for byte order,
 * according to byte significance from low address to high.
 */
#define	LITTLE_ENDIAN	1234	/* least-significant byte first (vax) */
#define	BIG_ENDIAN	4321	/* most-significant byte first (IBM, net) */
#define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long (pdp) */

#ifdef vax
#define	BYTE_ORDER	LITTLE_ENDIAN
#else
#define	BYTE_ORDER	BIG_ENDIAN	/* mc68000, tahoe, most others */
#endif
#endif BYTE_ORDER

/*
 * Definitions for internet protocol version 4.
 * Per RFC 791, September 1981.
 */
#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 {
#if BYTE_ORDER == LITTLE_ENDIAN 
	u_char	ip_hl:4,		/* header length */
		ip_v:4;			/* version */
#endif
#if BYTE_ORDER == BIG_ENDIAN 
	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		0x10

/*
 * 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 */
#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;
};

/* 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	IPFRAGTTL	60		/* time to live for frags, slowhz */
#define	IPTTLDEC	1		/* subtracted when forwarding */

#define	IP_MSS		576		/* default maximum segment size */
Commit	Line	Data
8ae0e4b4	1	/*
0880b18e	2	* Copyright (c) 1982, 1986 Regents of the University of California.
2b6b6284	3	* All rights reserved.
8ae0e4b4	4	*
dbf0c423	5	* %sccs.include.redist.c%
2b6b6284	6	*
dbf0c423	7	* @(#)ip.h 7.10 (Berkeley) %G%
8ae0e4b4	8	*/
233ed7a5 MK	9	#ifndef BYTE_ORDER
	10	/*
	11	* Definitions for byte order,
	12	* according to byte significance from low address to high.
	13	*/
	14	#define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */
	15	#define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
	16	#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */
	17
	18	#ifdef vax
	19	#define BYTE_ORDER LITTLE_ENDIAN
	20	#else
	21	#define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */
	22	#endif
	23	#endif BYTE_ORDER
6e8b2eca	24
dad64fdf BJ	25	/*
	26	* Definitions for internet protocol version 4.
	27	* Per RFC 791, September 1981.
	28	*/
	29	#define IPVERSION 4
	30
	31	/*
	32	* Structure of an internet header, naked of options.
	33	*
53a5409e BJ	34	* We declare ip_len and ip_off to be short, rather than u_short
	35	* pragmatically since otherwise unsigned comparisons can result
	36	* against negative integers quite easily, and fail in subtle ways.
dad64fdf	37	*/
6e8b2eca	38	struct ip {
f8b9a4f5	39	#if BYTE_ORDER == LITTLE_ENDIAN
6e8b2eca BJ	40	u_char ip_hl:4, /* header length */
6e8b2eca BJ	41	ip_v:4; /* version */
f112c673	42	#endif
f8b9a4f5	43	#if BYTE_ORDER == BIG_ENDIAN
f112c673 MK	44	u_char ip_v:4, /* version */
f112c673 MK	45	ip_hl:4; /* header length */
498aff44	46	#endif
6e8b2eca	47	u_char ip_tos; /* type of service */
82422b42	48	short ip_len; /* total length */
6e8b2eca	49	u_short ip_id; /* identification */
82422b42	50	short ip_off; /* fragment offset field */
dad64fdf BJ	51	#define IP_DF 0x4000 /* dont fragment flag */
dad64fdf BJ	52	#define IP_MF 0x2000 /* more fragments flag */
6e8b2eca BJ	53	u_char ip_ttl; /* time to live */
	54	u_char ip_p; /* protocol */
	55	u_short ip_sum; /* checksum */
2b4b57cd	56	struct in_addr ip_src,ip_dst; /* source and dest address */
0fcb2ae6 BJ	57	};
0fcb2ae6 BJ	58
9d059868 MK	59	#define IP_MAXPACKET 65535 /* maximum packet size */
9d059868 MK	60
3e3821e4 MK	61	/*
	62	* Definitions for IP type of service (ip_tos)
	63	*/
	64	#define IPTOS_LOWDELAY 0x10
	65	#define IPTOS_THROUGHPUT 0x08
	66	#define IPTOS_RELIABILITY 0x04
	67
	68	/*
	69	* Definitions for IP precedence (also in ip_tos) (hopefully unused)
	70	*/
	71	#define IPTOS_PREC_NETCONTROL 0xe0
	72	#define IPTOS_PREC_INTERNETCONTROL 0xc0
	73	#define IPTOS_PREC_CRITIC_ECP 0xa0
	74	#define IPTOS_PREC_FLASHOVERRIDE 0x80
	75	#define IPTOS_PREC_FLASH 0x60
	76	#define IPTOS_PREC_IMMEDIATE 0x40
	77	#define IPTOS_PREC_PRIORITY 0x20
	78	#define IPTOS_PREC_ROUTINE 0x10
	79
6e8b2eca	80	/*
dad64fdf BJ	81	* Definitions for options.
	82	*/
	83	#define IPOPT_COPIED(o) ((o)&0x80)
579b0a35 MK	84	#define IPOPT_CLASS(o) ((o)&0x60)
579b0a35 MK	85	#define IPOPT_NUMBER(o) ((o)&0x1f)
dad64fdf BJ	86
dad64fdf BJ	87	#define IPOPT_CONTROL 0x00
579b0a35 MK	88	#define IPOPT_RESERVED1 0x20
	89	#define IPOPT_DEBMEAS 0x40
	90	#define IPOPT_RESERVED2 0x60
dad64fdf BJ	91
	92	#define IPOPT_EOL 0 /* end of option list */
	93	#define IPOPT_NOP 1 /* no operation */
	94
	95	#define IPOPT_RR 7 /* record packet route */
	96	#define IPOPT_TS 68 /* timestamp */
	97	#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
	98	#define IPOPT_LSRR 131 /* loose source route */
	99	#define IPOPT_SATID 136 /* satnet id */
	100	#define IPOPT_SSRR 137 /* strict source route */
	101
f52643db MK	102	/*
	103	* Offsets to fields in options other than EOL and NOP.
	104	*/
	105	#define IPOPT_OPTVAL 0 /* option ID */
	106	#define IPOPT_OLEN 1 /* option length */
	107	#define IPOPT_OFFSET 2 /* offset within option */
	108	#define IPOPT_MINOFF 4 /* min value of above */
	109
dad64fdf BJ	110	/*
	111	* Time stamp option structure.
	112	*/
	113	struct ip_timestamp {
	114	u_char ipt_code; /* IPOPT_TS */
	115	u_char ipt_len; /* size of structure (variable) */
	116	u_char ipt_ptr; /* index of current entry */
f8b9a4f5	117	#if BYTE_ORDER == LITTLE_ENDIAN
dad64fdf BJ	118	u_char ipt_flg:4, /* flags, see below */
dad64fdf BJ	119	ipt_oflw:4; /* overflow counter */
f112c673	120	#endif
f8b9a4f5	121	#if BYTE_ORDER == BIG_ENDIAN
f112c673 MK	122	u_char ipt_oflw:4, /* overflow counter */
	123	ipt_flg:4; /* flags, see below */
	124	#endif
f8b9a4f5	125	union ipt_timestamp {
dad64fdf BJ	126	n_long ipt_time[1];
dad64fdf BJ	127	struct ipt_ta {
2b4b57cd	128	struct in_addr ipt_addr;
dad64fdf BJ	129	n_long ipt_time;
dad64fdf BJ	130	} ipt_ta[1];
f8b9a4f5	131	} ipt_timestamp;
dad64fdf BJ	132	};
	133
	134	/* flag bits for ipt_flg */
	135	#define IPOPT_TS_TSONLY 0 /* timestamps only */
	136	#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
f959ef3e	137	#define IPOPT_TS_PRESPEC 3 /* specified modules only */
dad64fdf BJ	138
	139	/* bits for security (not byte swapped) */
	140	#define IPOPT_SECUR_UNCLASS 0x0000
	141	#define IPOPT_SECUR_CONFID 0xf135
	142	#define IPOPT_SECUR_EFTO 0x789a
	143	#define IPOPT_SECUR_MMMM 0xbc4d
	144	#define IPOPT_SECUR_RESTR 0xaf13
	145	#define IPOPT_SECUR_SECRET 0xd788
	146	#define IPOPT_SECUR_TOPSECRET 0x6bc5
	147
dad64fdf BJ	148	/*
	149	* Internet implementation parameters.
	150	*/
6e8b2eca	151	#define MAXTTL 255 /* maximum time to live (seconds) */
e3138fb8	152	#define IPFRAGTTL 60 /* time to live for frags, slowhz */
b3caeaac	153	#define IPTTLDEC 1 /* subtracted when forwarding */
99578149 MK	154
99578149 MK	155	#define IP_MSS 576 /* default maximum segment size */