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/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)in.h	2.2 - 90/08/03
 */

#ifndef _h_IN
#define _h_IN
#ifndef _h_BSDTYPES
#include <sys/bsdtypes.h>
#endif
#ident "@(#)in.h	2.2 - 90/08/03"
/*
 * Constants and structures defined by the internet system,
 * Per RFC 790, September 1981.
 */

/*
 * Protocols
 */
#define	IPPROTO_IP		0		/* dummy for IP */
#define	IPPROTO_ICMP		1		/* control message protocol */
#define	IPPROTO_GGP		3		/* 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_IDP		22		/* xns idp */

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


/*
 * Ports < IPPORT_RESERVED are reserved for
 * privileged processes (e.g. root).
 * Ports > IPPORT_USERRESERVED are reserved
 * for servers, not necessarily privileged.
 */
#define	IPPORT_RESERVED		1024
#define	IPPORT_USERRESERVED	5000

/*
 * 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.
 * On subnets, the decomposition of addresses to host and net parts
 * is done according to subnet mask, not the masks here.
 */
#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) & 0xe0000000) == 0xc0000000)
#define	IN_CLASSC_NET		0xffffff00
#define	IN_CLASSC_NSHIFT	8
#define	IN_CLASSC_HOST		0x000000ff

#define	IN_CLASSD(i)		(((long)(i) & 0xf0000000) == 0xe0000000)
#define	IN_MULTICAST(i)		IN_CLASSD(i)

#define	IN_EXPERIMENTAL(i)	(((long)(i) & 0xe0000000) == 0xe0000000)
#define	IN_BADCLASS(i)		(((long)(i) & 0xf0000000) == 0xf0000000)

#define	INADDR_ANY		(u_long)0x00000000
#define	INADDR_BROADCAST	(u_long)0xffffffff	/* must be masked */
#ifndef KERNEL
#define	INADDR_NONE		0xffffffff		/* -1 return */
#endif

#define	IN_LOOPBACKNET		127			/* official! */

/*
 * Socket address, internet style.
 */
struct sockaddr_in {
	short	sin_family;
	u_short	sin_port;
	struct	in_addr sin_addr;
	char	sin_zero[8];
};
#define SIZEOF_SOCKADDR_IN (sizeof(struct sockaddr_in)-8)

/*
 * Options for use with [gs]etsockopt at the IP level.
 */
#define	IP_OPTIONS	1		/* set/get IP per-packet options */
#define IP_FRAGMENT	3		/* disable ip fragmenting */
#define IP_TOS		4		/* ip TOS field */

#if !defined(vax) && !defined(ntohl) && !defined(lint) && !defined(i386)
/*
 * Macros for number representation conversion.
 */
#define	ntohl(x)	(x)
#define	ntohs(x)	(x)
#define	htonl(x)	(x)
#define	htons(x)	(x)
#endif
#if defined(i386) && !defined(NO_ASM) && !defined(__STDC__)

/*
 * in-line expansion is a little more efficient than a function call
 * since the V.3 asm construct is fairly flexible, we can use it like a
 * function call in most cases.
 */

asm ushort
ntohs(val)
{
; asm for inline ntohs
%reg val;
	movzwl	val,%eax
	rolw	$8,%ax
%mem val;
	clrl	%eax
	movl	val,%eax
	rolw	$8,%ax
}
asm u_long
ntohl(val)
{
; asm for inline ntohl
%reg val;
        movl    val,%eax
   	rolw	$8,%ax
	roll	$16,%eax
	rolw	$8,%ax
%mem val;
        movl    val,%eax
   	rolw	$8,%ax
	roll	$16,%eax
	rolw	$8,%ax
}
asm ushort
htons(val)
{
; asm for inline htons
%reg val;
	movzwl	val,%eax
	rolw	$8,%ax
%mem val;
	clrl	%eax
	movl	val,%eax
	rolw	$8,%ax
}
asm ulong
htonl(val)
{
; asm for inline htonl
%reg val;
        movl    val,%eax
   	rolw	$8,%ax
	roll	$16,%eax
	rolw	$8,%ax
%mem val;
        movl    val,%eax
   	rolw	$8,%ax
	roll	$16,%eax
	rolw	$8,%ax
}
#endif

#ifndef MIN
#define MIN(a,b)  ((a)<(b) ? (a) : (b))
#define imin(a,b)  ((a)<(b) ? (a) : (b))
#endif

#if !defined(ntohl) && (defined(vax) || defined(lint) || defined(i386))
u_short	ntohs(), htons();
u_long	ntohl(), htonl();
#endif

/*
 * internet options
 *
 * format of options for use with TCP/UDP/IP
 * option formats are probably subject to change
 */

/*
 * options are specified by providing one inetopt structure for each option to
 * be set.  multiple options are handled by concatenation of the multiple
 * structs and setting the OPT_length field in the appropriate t_connect,
 * t_optmgmt, etc., structure to the total length.  Each individual option
 * will have its own length.  It is an error to have an incomplete structure.
 */
struct inetopt {
   short	len;		/* length of option (including leadin) */
   ushort	name;		/* option identifier */
   ushort	level;		/* socket/TCP/UDP/IP, etc */
   short	fill;		/* filler to get word aligned */
#define IOPT_LEADIN_LEN	(sizeof(short)*4)
   union inetoptval {
      short		sval;	/* shortint value */
      int		ival;	/* int value */
      long		lval;	/* long int value */
      caddr_t	       *cval;	/* byte string value */
      unchar		vval[1];/* arbitrary length data */
   }		value;
};

/*
 * option names are the same values defined in the updated BSD documentation.
 * Conflicts are resolved by the "level" field.  Note: the structure
 * corresponds to the setsockopt system call parameters.
 */

#define OPT_ERROR	0x8000	/* name will have this ORd in on error */


#ifdef KERNEL
#include <sys/protosw.h>
/* splimp needs to be streams priority */
#define splimp splstr
extern	struct protosw inetsw[];
extern struct	in_addr in_makeaddr();
extern u_long	in_netof(), in_lnaof(), in_mainnetof();
#endif
#endif /* _h_IN */
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