/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
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 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * ppp_defs.h - PPP definitions.
 *
 * Copyright (c) 1994 The Australian National University.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, provided that the above copyright
 * notice appears in all copies.  This software is provided without any
 * warranty, express or implied. The Australian National University
 * makes no representations about the suitability of this software for
 * any purpose.
 *
 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
 * OR MODIFICATIONS.
 *
 */

#ifndef _PPP_DEFS_H_
#define _PPP_DEFS_H_
#include <sys/appleapiopts.h>

/*
 * The basic PPP frame.
 */
#define PPP_HDRLEN      4       /* octets for standard ppp header */
#define PPP_FCSLEN      2       /* octets for FCS */
#define PPP_MRU         1500    /* default MRU = max length of info field */

#define PPP_ADDRESS(p)  (((u_char *)(p))[0])
#define PPP_CONTROL(p)  (((u_char *)(p))[1])
#define PPP_PROTOCOL(p) ((((u_char *)(p))[2] << 8) + ((u_char *)(p))[3])

/*
 * Significant octet values.
 */
#define PPP_ALLSTATIONS 0xff    /* All-Stations broadcast address */
#define PPP_UI          0x03    /* Unnumbered Information */
#define PPP_FLAG        0x7e    /* Flag Sequence */
#define PPP_ESCAPE      0x7d    /* Asynchronous Control Escape */
#define PPP_TRANS       0x20    /* Asynchronous transparency modifier */

/*
 * Protocol field values.
 */
#define PPP_IP          0x21    /* Internet Protocol */
#define PPP_XNS         0x25    /* Xerox NS */
#define PPP_AT          0x29    /* AppleTalk Protocol */
#define PPP_IPX         0x2b    /* IPX Datagram (RFC1552) */
#define PPP_VJC_COMP    0x2d    /* VJ compressed TCP */
#define PPP_VJC_UNCOMP  0x2f    /* VJ uncompressed TCP */
#define PPP_COMP        0xfd    /* compressed packet */
#define PPP_IPCP        0x8021  /* IP Control Protocol */
#define PPP_ATCP        0x8029  /* AppleTalk Control Protocol */
#define PPP_IPXCP       0x802b  /* IPX Control Protocol (RFC1552) */
#define PPP_CCP         0x80fd  /* Compression Control Protocol */
#define PPP_LCP         0xc021  /* Link Control Protocol */
#define PPP_PAP         0xc023  /* Password Authentication Protocol */
#define PPP_LQR         0xc025  /* Link Quality Report protocol */
#define PPP_CHAP        0xc223  /* Cryptographic Handshake Auth. Protocol */
#define PPP_CBCP        0xc029  /* Callback Control Protocol */
#define PPP_IPV6        0x57    /* Internet Protocol version 6*/
#define PPP_IPV6CP      0x8057  /* IPv6 Control Protocol */

/*
 * Values for FCS calculations.
 */
#define PPP_INITFCS     0xffff  /* Initial FCS value */
#define PPP_GOODFCS     0xf0b8  /* Good final FCS value */
#define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])

/*
 * Extended asyncmap - allows any character to be escaped.
 */
typedef u_int32_t       ext_accm[8];

/*
 * What to do with network protocol (NP) packets.
 */
enum NPmode {
	NPMODE_PASS,            /* pass the packet through */
	NPMODE_DROP,            /* silently drop the packet */
	NPMODE_ERROR,           /* return an error */
	NPMODE_QUEUE            /* save it up for later. */
};

/*
 * Statistics.
 */
struct pppstat  {
	unsigned int ppp_ibytes; /* bytes received */
	unsigned int ppp_ipackets; /* packets received */
	unsigned int ppp_ierrors; /* receive errors */
	unsigned int ppp_obytes; /* bytes sent */
	unsigned int ppp_opackets; /* packets sent */
	unsigned int ppp_oerrors; /* transmit errors */
};

struct vjstat {
	unsigned int vjs_packets; /* outbound packets */
	unsigned int vjs_compressed; /* outbound compressed packets */
	unsigned int vjs_searches; /* searches for connection state */
	unsigned int vjs_misses; /* times couldn't find conn. state */
	unsigned int vjs_uncompressedin; /* inbound uncompressed packets */
	unsigned int vjs_compressedin; /* inbound compressed packets */
	unsigned int vjs_errorin; /* inbound unknown type packets */
	unsigned int vjs_tossed; /* inbound packets tossed because of error */
};

struct ppp_stats {
	struct pppstat p;       /* basic PPP statistics */
	struct vjstat vj;       /* VJ header compression statistics */
};

struct compstat {
	unsigned int unc_bytes; /* total uncompressed bytes */
	unsigned int unc_packets; /* total uncompressed packets */
	unsigned int comp_bytes; /* compressed bytes */
	unsigned int comp_packets; /* compressed packets */
	unsigned int inc_bytes; /* incompressible bytes */
	unsigned int inc_packets; /* incompressible packets */
	unsigned int ratio;     /* recent compression ratio << 8 */
};

struct ppp_comp_stats {
	struct compstat c;      /* packet compression statistics */
	struct compstat d;      /* packet decompression statistics */
};

/*
 * The following structure records the time in seconds since
 * the last NP packet was sent or received.
 */
struct ppp_idle {
	time_t xmit_idle;       /* time since last NP packet sent */
	time_t recv_idle;       /* time since last NP packet received */
};

#endif /* _PPP_DEFS_H_ */
