/*	$OpenBSD: pk.h,v 1.4 2003/09/26 21:43:32 miod Exp $	*/
/*	$NetBSD: pk.h,v 1.6 1996/02/13 22:05:08 christos Exp $	*/

/*
 * Copyright (c) University of British Columbia, 1984
 * Copyright (c) 1990, 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Laboratory for Computation Vision and the Computer Science Department
 * of the University of British Columbia.
 *
 * 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. 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.
 *
 *	@(#)pk.h	8.1 (Berkeley) 6/10/93
 */

/*
 *
 *  X.25 Packet Level Definitions:
 *
 */

/* Packet type identifier field definitions. */

#define X25_CALL                         11
#define X25_CALL_ACCEPTED                15   
#define X25_CLEAR                        19
#define X25_CLEAR_CONFIRM                23  
#define X25_DATA                          0   
#define X25_INTERRUPT                    35   
#define X25_INTERRUPT_CONFIRM            39   

#define X25_RR                            1   
#define X25_RNR                           5   
#define X25_REJECT			  9
#define X25_RESET                        27 
#define X25_RESET_CONFIRM                31   
#define X25_DIAGNOSTIC			241

#define X25_RESTART                     251     
#define X25_RESTART_CONFIRM		255 

/* Restart cause field definitions. */

#define X25_RESTART_DTE_ORIGINATED	  0
#define X25_RESTART_LOCAL_PROCEDURE_ERROR 1
#define X25_RESTART_NETWORK_CONGESTION	  3
#define X25_RESTART_NETWORK_OPERATIONAL	  7
#define X25_RESTART_DTE_ORIGINATED2	  128


/* Miscellaneous definitions. */

#define DATA_PACKET_DESIGNATOR		0x01
#define RR_OR_RNR_PACKET_DESIGNATOR	0x02
#define RR_PACKET_DESIGNATOR		0x04

#define DEFAULT_WINDOW_SIZE		2
#define MODULUS				8

#define ADDRLN				1
#define MAXADDRLN			15
#define FACILITIESLN			1
#define MAXFACILITIESLN			10
#define MAXUSERDATA			16
#define MAXCALLINFOLN			1+15+1+10+16

#define PACKET_OK			0
#define IGNORE_PACKET			1
#define ERROR_PACKET			2

#ifndef CCITT_TYPES_DEFINED
#define CCITT_TYPES_DEFINED
#define FALSE	0
#define TRUE	1
typedef char    bool;
typedef u_char octet;
#endif

/*
 *  X.25 Packet format definitions
 *  This will eventually have to be rewritten without reference
 *  to bit fields, to be ansi C compliant and allignment safe.
 */


struct x25_calladdr {
	octet addrlens;
	octet address_field[MAXADDRLN];
};

struct x25_packet {
	octet bits;
	octet logical_channel_number;
	octet packet_type;
	octet packet_data;
};
#define packet_cause packet_data

struct data_packet {
	octet bits;
};

#define FACILITIES_REVERSE_CHARGE	0x1
#define FACILITIES_THROUGHPUT		0x2
#define FACILITIES_PACKETSIZE		0x42
#define FACILITIES_WINDOWSIZE		0x43

#define PKHEADERLN	3

#define DP(xp)          (((struct data_packet *)&(xp) -> packet_type) -> bits)
#define PS(xp)           X25GBITS(DP(xp), p_s)
#define PR(xp)           X25GBITS(DP(xp), p_r)
#define MBIT(xp)         X25GBITS(DP(xp), m_bit)
#define SPR(xp, v)       X25SBITS(DP(xp), p_r, (v))
#define SPS(xp, v)       X25SBITS(DP(xp), p_s, (v))
#define SMBIT(xp, v)     X25SBITS(DP(xp), m_bit, (v))

#define LCN(xp)		(xp -> logical_channel_number + \
	(X25GBITS(xp -> bits, lc_group_number) ? (X25GBITS(xp -> bits, lc_group_number) << 8) : 0))
#define SET_LCN(xp, lcn) ((xp -> logical_channel_number = lcn), \
	(X25SBITS(xp -> bits, lc_group_number, lcn > 255 ? lcn >> 8 : 0)))

/* Define X.25 packet level states. */

/* Call setup and clearing substates.  */

#define LISTEN           0
#define READY            1
#define RECEIVED_CALL    2
#define SENT_CALL        3
#define DATA_TRANSFER    4
#define RECEIVED_CLEAR   5
#define SENT_CLEAR       6

/* DTE states. */

#define DTE_WAITING		7
#define DTE_RECEIVED_RESTART	8
#define DTE_SENT_RESTART	9
#define DTE_READY		0

/* Cleaning out ... */

#define LCN_ZOMBIE 		10

#define MAXSTATES		11

/*
 *  The following definitions are used in a switch statement after
 *  determining the packet type.  These values are returned by the
 *  pk_decode procedure. 
 */

#define PK_CALL			(0 * MAXSTATES)
#define PK_CALL_ACCEPTED	(1 * MAXSTATES)
#define PK_CLEAR		(2 * MAXSTATES)
#define PK_CLEAR_CONF		(3 * MAXSTATES)
#define PK_DATA			(4 * MAXSTATES)
#define PK_INTERRUPT		(5 * MAXSTATES)
#define PK_INTERRUPT_CONF	(6 * MAXSTATES)
#define PK_RR			(7 * MAXSTATES)
#define PK_RNR			(8 * MAXSTATES)
#define PK_RESET		(9 * MAXSTATES)
#define PK_RESET_CONF		(10 * MAXSTATES)
#define PK_RESTART		(11 * MAXSTATES)
#define PK_RESTART_CONF		(12 * MAXSTATES)
#define PK_REJECT		(13 * MAXSTATES)
#define PK_DIAG_TYPE		(14 * MAXSTATES)
#define PK_INVALID_PACKET	(15 * MAXSTATES)
#define PK_DELETE_PACKET	(PK_INVALID_PACKET)

/*
 * The following definitions are used by the restart procedures
 * for noting wether the PLE is supposed to behave as DTE or DCE
 * (essentially necessary for operation over LLC2)
 */
#define	DTE_DXERESOLVING	0x0001
#define	DTE_PLAYDTE		0x0002
#define	DTE_PLAYDCE		0x0004
#define DTE_CONNECTPENDING	0x0010
#define	DTE_PRETENDDTE		0x0020

#define MAXRESTARTCOLLISIONS	10
