/*	in.h	6.4	85/03/18	*/

/*
 * Constants and structures defined by the internet system,
 * Per RFC 790, September 1981.
 */

/*
 * Protocols
 */
#define	IPPROTO_ICMP		1		/* control message protocol */
#define	IPPROTO_GGP		2		/* gateway^2 (deprecated) */
#define	IPPROTO_TCP		6		/* tcp */
#define	IPPROTO_EGP		8		/* exterior gateway protocol */
#define	IPPROTO_PUP		12		/* pup */
#define	IPPROTO_UDP		17		/* user datagram protocol */

#define	IPPROTO_RAW		255		/* raw IP packet */
#define	IPPROTO_MAX		256


/*
 * Ports < IPPORT_RESERVED are reserved for
 * privileged processes (e.g. root).
 */
#define	IPPORT_RESERVED		1024

/*
 * Link numbers
 */
#define	IMPLINK_IP		155
#define	IMPLINK_LOWEXPER	156
#define	IMPLINK_HIGHEXPER	158

/*
 * Internet address (a structure for historical reasons)
 */
struct in_addr {
	u_long s_addr;
};

/*
 * Definitions of bits in internet address integers.
 */
#define	IN_CLASSA(i)		((((long)(i))&0x80000000)==0)
#define	IN_CLASSA_NET		0xff000000
#define	IN_CLASSA_NSHIFT	24
#define	IN_CLASSA_HOST		0x00ffffff
#define	IN_CLASSA_MAX		128

#define	IN_CLASSB(i)		((((long)(i))&0xc0000000)==0x80000000)
#define	IN_CLASSB_NET		0xffff0000
#define	IN_CLASSB_NSHIFT	16
#define	IN_CLASSB_HOST		0x0000ffff
#define	IN_CLASSB_MAX		65536

#define	IN_CLASSC(i)		((((long)(i))&0xc0000000)==0xc0000000)
#define	IN_CLASSC_NET		0xffffff00
#define	IN_CLASSC_NSHIFT	8
#define	IN_CLASSC_HOST		0x000000ff

#define	INADDR_ANY		0x00000000
#define	INADDR_BROADCAST	0xffffffff

/*
 * Macros for subnetworks.  A subnet is distinguished by
 * 	(1) the network number is a `local' network number, and
 *	(2) the most significant bit of the host part is set.
 * Such addresses include one additional byte in the network number,
 * and use one less byte in the host part (i.e., a subnet of a Class A
 * network uses the rules for Class B net/host number extraction,
 * a Class B subnet is dealt with as if it were a Class C net).
 * Subnets of Class C nets are not supported.
 */
#define	SUBNETSHIFT		8  /* used to get main net number from subnet */

#define	IN_SUBNETA(i)		((((long)(i))&0x80800000)==0x00800000)
#define	IN_CLASSA_SUBNET	0xffff0000
#define	IN_CLASSA_SUBNSHIFT	(IN_CLASSA_NSHIFT - SUBNETSHIFT)
#define	IN_CLASSA_SUBHOST	0x0000ffff

#define	IN_SUBNETB(i)		((((long)(i))&0xc0008000)==0x80008000)
#define	IN_CLASSB_SUBNET	0xffffff00
#define	IN_CLASSB_SUBNSHIFT	(IN_CLASSB_NSHIFT - SUBNETSHIFT)
#define	IN_CLASSA_SUBHOST	0x0000ffff
#define	IN_CLASSB_SUBHOST	0x000000ff

/*
 * Socket address, internet style.
 */
struct sockaddr_in {
	short	sin_family;
	u_short	sin_port;
	struct	in_addr sin_addr;
	char	sin_zero[8];
};

#if !defined(vax)
/*
 * Macros for number representation conversion.
 */
#define	ntohl(x)	(x)
#define	ntohs(x)	(x)
#define	htonl(x)	(x)
#define	htons(x)	(x)
#endif

#ifdef KERNEL
extern	struct domain inetdomain;
extern	struct protosw inetsw[];
struct	in_addr in_makeaddr();
#endif