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/* $Id: isdn.h,v 1.1.1.1 2001-09-10 07:44:43 simons Exp $

 *

 * Main header for the Linux ISDN subsystem (linklevel).

 *

 * Copyright 1994-1998  by Fritz Elfert (fritz@isdn4linux.de)

 * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg

 * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2, or (at your option)

 * any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 *

 * $Log: not supported by cvs2svn $

 * Revision 1.1.1.1  2001/07/02 17:57:57  simons

 * Initial revision

 *

 * Revision 1.31.2.17  1998/11/05 22:13:28  fritz

 * Changed mail-address.

 *

 * Revision 1.31.2.16  1998/11/04 17:22:53  fritz

 * Replaced broken lowlevel-driver locking.

 *

 * Revision 1.31.2.15  1998/11/03 14:31:57  fritz

 * Reduced stack usage in various functions.

 * Adapted statemachine to work with certified HiSax.

 * Some fixes in callback handling.

 *

 * Revision 1.31.2.14  1998/10/25 14:37:37  fritz

 * Backported from MIPS (Cobalt).

 *

 * Revision 1.31.2.13  1998/10/23 10:14:25  paul

 * Implementation of "dialmode" (successor of "status")

 * You also need current isdnctrl for this!

 *

 * Revision 1.31.2.12  1998/08/22 16:41:25  armin

 * Added silence detection in audio receive mode (AT+VSD).

 *

 * Revision 1.31.2.11  1998/07/15 15:04:19  calle

 * make isdn4k-utils compile again.

 *

 * Revision 1.31.2.10  1998/06/07 13:48:30  fritz

 * ABC cleanup

 *

 * Revision 1.31.2.9  1998/06/02 12:12:49  detabc

 * wegen einer einstweiliger verfuegung gegen DW ist zur zeit

 * die abc-extension bis zur klaerung der rechtslage nicht verfuegbar

 *

 * Revision 1.31.2.8  1998/05/06 08:30:44  detabc

 * add Item to stop icmp-unreach (max. 6 times of dialwait delay)

 *

 * Revision 1.31.2.7  1998/04/26 19:51:40  detabc

 * removed unused code

 *

 * Revision 1.31.2.6  1998/04/26 11:10:46  detabc

 * add items for the abc_tx_queus and the abc_delayed_hangup

 * only used if the abc-extension is enabled

 *

 * Revision 1.31.2.5  1998/04/18 17:39:45  detabc

 * remove some unused abc-lines

 * added defines und items for abc-secure callback (only used with abc-extenrsion)

 *

 * Revision 1.31.2.4  1998/04/08 21:42:25  keil

 * Blocksize default 1024

 *

 * Revision 1.31.2.3  1998/03/16 09:56:28  cal

 * Merged in TimRu-patches. Still needs validation in conjunction with ABC-patches.

 *

 * Revision 1.31.2.2  1998/03/07 23:35:45  detabc

 * added the abc-extension to the linux isdn-kernel

 * for kernel-version 2.0.xx

 * DO NOT USE FOR HIGHER KERNELS-VERSIONS

 * all source-lines are switched with the define  CONFIG_ISDN_WITH_ABC

 * (make config and answer ABC-Ext. Support (Compress,TCP-Keepalive ...) with yes

 *

 * you need also a modified isdnctrl-source the switch on the

 * features of the abc-extension

 *

 * please use carefully. more detail will be follow.

 * thanks

 *

 * Revision 1.31.2.1  1997/08/21 15:57:04  fritz

 * Synchronized 2.0.X branch with 2.0.31-pre7

 *

 * Revision 1.31  1997/06/22 11:57:07  fritz

 * Added ability to adjust slave triggerlevel.

 *

 * Revision 1.30  1997/06/17 13:07:23  hipp

 * compression changes , MP changes

 *

 * Revision 1.29  1997/05/27 15:18:02  fritz

 * Added changes for recent 2.1.x kernels:

 *   changed return type of isdn_close

 *   queue_task_* -> queue_task

 *   clear/set_bit -> test_and_... where apropriate.

 *   changed type of hard_header_cache parameter.

 *

 * Revision 1.28  1997/03/07 01:33:01  fritz

 * Added proper ifdef's for CONFIG_ISDN_AUDIO

 *

 * Revision 1.27  1997/03/05 21:11:49  fritz

 * Minor fixes.

 *

 * Revision 1.26  1997/02/28 02:37:53  fritz

 * Added some comments.

 *

 * Revision 1.25  1997/02/23 16:54:23  hipp

 * some initial changes for future PPP compresion

 *

 * Revision 1.24  1997/02/18 09:42:45  fritz

 * Bugfix: Increased ISDN_MODEM_ANZREG.

 * Increased TTY_DV.

 *

 * Revision 1.23  1997/02/10 22:07:13  fritz

 * Added 2 modem registers for numbering plan and screening info.

 *

 * Revision 1.22  1997/02/03 23:42:08  fritz

 * Added ISDN_TIMER_RINGING

 * Misc. changes for Kernel 2.1.X compatibility

 *

 * Revision 1.21  1997/01/17 01:19:10  fritz

 * Applied chargeint patch.

 *

 * Revision 1.20  1997/01/17 00:41:19  fritz

 * Increased TTY_DV.

 *

 * Revision 1.19  1997/01/14 01:41:07  fritz

 * Added ATI2 related variables.

 * Added variables for audio support in skbuffs.

 *

 * Revision 1.18  1996/11/06 17:37:50  keil

 * more changes for 2.1.X

 *

 * Revision 1.17  1996/09/07 12:53:57  hipp

 * moved a few isdn_ppp.c specific defines to drives/isdn/isdn_ppp.h

 *

 * Revision 1.16  1996/08/12 16:20:56  hipp

 * renamed ppp_minor to ppp_slot

 *

 * Revision 1.15  1996/06/15 14:56:57  fritz

 * Added version signatures for data structures used

 * by userlevel programs.

 *

 * Revision 1.14  1996/06/06 21:24:23  fritz

 * Started adding support for suspend/resume.

 *

 * Revision 1.13  1996/06/05 02:18:20  fritz

 * Added DTMF decoding stuff.

 *

 * Revision 1.12  1996/06/03 19:55:08  fritz

 * Fixed typos.

 *

 * Revision 1.11  1996/05/31 01:37:47  fritz

 * Minor changes, due to changes in isdn_tty.c

 *

 * Revision 1.10  1996/05/18 01:37:18  fritz

 * Added spelling corrections and some minor changes

 * to stay in sync with kernel.

 *

 * Revision 1.9  1996/05/17 03:58:20  fritz

 * Added flags for DLE handling.

 *

 * Revision 1.8  1996/05/11 21:49:55  fritz

 * Removed queue management variables.

 * Changed queue management to use sk_buffs.

 *

 * Revision 1.7  1996/05/07 09:10:06  fritz

 * Reorganized tty-related structs.

 *

 * Revision 1.6  1996/05/06 11:38:27  hipp

 * minor change in ippp struct

 *

 * Revision 1.5  1996/04/30 11:03:16  fritz

 * Added Michael's ippp-bind patch.

 *

 * Revision 1.4  1996/04/29 23:00:02  fritz

 * Added variables for voice-support.

 *

 * Revision 1.3  1996/04/20 16:54:58  fritz

 * Increased maximum number of channels.

 * Added some flags for isdn_net to handle callback more reliable.

 * Fixed delay-definitions to be more accurate.

 * Misc. typos

 *

 * Revision 1.2  1996/02/11 02:10:02  fritz

 * Changed IOCTL-names

 * Added rx_netdev, st_netdev, first_skb, org_hcb, and org_hcu to

 * Netdevice-local struct.

 *

 * Revision 1.1  1996/01/10 20:55:07  fritz

 * Initial revision

 *

 */

#ifndef isdn_h

#define isdn_h

#include <linux/config.h>

#include <linux/ioctl.h>

#define ISDN_TTY_MAJOR    43

#define ISDN_TTYAUX_MAJOR 44

#define ISDN_MAJOR        45

/* The minor-devicenumbers for Channel 0 and 1 are used as arguments for

 * physical Channel-Mapping, so they MUST NOT be changed without changing

 * the correspondent code in isdn.c

 */

#ifdef CONFIG_COBALT_MICRO_SERVER

/* Save memory */

#define ISDN_MAX_DRIVERS    2

#define ISDN_MAX_CHANNELS   8

#else

#define ISDN_MAX_DRIVERS    32

#define ISDN_MAX_CHANNELS   64

#endif

#define ISDN_MINOR_B        0

#define ISDN_MINOR_BMAX     (ISDN_MAX_CHANNELS-1)

#define ISDN_MINOR_CTRL     64

#define ISDN_MINOR_CTRLMAX  (64 + (ISDN_MAX_CHANNELS-1))

#define ISDN_MINOR_PPP      128

#define ISDN_MINOR_PPPMAX   (128 + (ISDN_MAX_CHANNELS-1))

#define ISDN_MINOR_STATUS   255

/* New ioctl-codes */

#define IIOCNETAIF  _IO('I',1)

#define IIOCNETDIF  _IO('I',2)

#define IIOCNETSCF  _IO('I',3)

#define IIOCNETGCF  _IO('I',4)

#define IIOCNETANM  _IO('I',5)

#define IIOCNETDNM  _IO('I',6)

#define IIOCNETGNM  _IO('I',7)

/* #define IIOCGETSET  _IO('I',8) obsolete */

/* #define IIOCSETSET  _IO('I',9) obsolete */

#define IIOCSETVER  _IO('I',10)

#define IIOCNETHUP  _IO('I',11)

#define IIOCSETGST  _IO('I',12)

#define IIOCSETBRJ  _IO('I',13)

#define IIOCSIGPRF  _IO('I',14)

#define IIOCGETPRF  _IO('I',15)

#define IIOCSETPRF  _IO('I',16)

#define IIOCGETMAP  _IO('I',17)

#define IIOCSETMAP  _IO('I',18)

#define IIOCNETASL  _IO('I',19)

#define IIOCNETDIL  _IO('I',20)

#define IIOCGETCPS  _IO('I',21)

#define IIOCGETDVR  _IO('I',22)

#define IIOCNETALN  _IO('I',32)

#define IIOCNETDLN  _IO('I',33)

#define IIOCDBGVAR  _IO('I',127)

#define IIOCDRVCTL  _IO('I',128)

/* Packet encapsulations for net-interfaces */

#define ISDN_NET_ENCAP_ETHER     0

#define ISDN_NET_ENCAP_RAWIP     1

#define ISDN_NET_ENCAP_IPTYP     2

#define ISDN_NET_ENCAP_CISCOHDLC 3

#define ISDN_NET_ENCAP_SYNCPPP   4

#define ISDN_NET_ENCAP_UIHDLC    5

/* Facility which currently uses an ISDN-channel */

#define ISDN_USAGE_NONE       0

#define ISDN_USAGE_RAW        1

#define ISDN_USAGE_MODEM      2

#define ISDN_USAGE_NET        3

#define ISDN_USAGE_VOICE      4

#define ISDN_USAGE_FAX        5

#define ISDN_USAGE_MASK       7 /* Mask to get plain usage */

#define ISDN_USAGE_EXCLUSIVE 64 /* This bit is set, if channel is exclusive */

#define ISDN_USAGE_OUTGOING 128 /* This bit is set, if channel is outgoing  */

#define ISDN_MODEM_ANZREG    23        /* Number of Modem-Registers        */

#define ISDN_MSNLEN          20

#define ISDN_LMSNLEN         255 /* Length of tty's Listen-MSN string */

typedef struct {

  char drvid[25];

  unsigned long arg;

} isdn_ioctl_struct;

typedef struct {

  unsigned long isdndev;

  unsigned long atmodem[ISDN_MAX_CHANNELS];

  unsigned long info[ISDN_MAX_CHANNELS];

} debugvar_addr;

typedef struct {

  char name[10];

  char phone[ISDN_MSNLEN];

  int  outgoing;

} isdn_net_ioctl_phone;

#define NET_DV 0x04 /* Data version for net_cfg     */

#define TTY_DV 0x04 /* Data version for iprofd etc. */

#define INF_DV 0x01 /* Data version for /dev/isdninfo */

typedef struct {

  char name[10];     /* Name of interface                     */

  char master[10];   /* Name of Master for Bundling           */

  char slave[10];    /* Name of Slave for Bundling            */

  char eaz[256];     /* EAZ/MSN                               */

  char drvid[25];    /* DriverId for Bindings                 */

  int  onhtime;      /* Hangup-Timeout                        */

  int  charge;       /* Charge-Units                          */

  int  l2_proto;     /* Layer-2 protocol                      */

  int  l3_proto;     /* Layer-3 protocol                      */

  int  p_encap;      /* Encapsulation                         */

  int  exclusive;    /* Channel, if bound exclusive           */

  int  dialmax;      /* Dial Retry-Counter                    */

  int  slavedelay;   /* Delay until slave starts up           */

  int  cbdelay;      /* Delay before Callback                 */

  int  chargehup;    /* Flag: Charge-Hangup                   */

  int  ihup;         /* Flag: Hangup-Timeout on incoming line */

  int  secure;       /* Flag: Secure                          */

  int  callback;     /* Flag: Callback                        */

  int  cbhup;        /* Flag: Reject Call before Callback     */

  int  pppbind;      /* ippp device for bindings              */

  int  chargeint;    /* Use fixed charge interval length      */

  int  triggercps;   /* BogoCPS needed for triggering slave   */

  int  dialtimeout;  /* Dial-Timeout                          */

  int  dialwait;     /* Time to wait after failed dial        */

  int  dialmode;     /* Flag: off / on / auto                 */

} isdn_net_ioctl_cfg;

#define ISDN_NET_DIALMODE_MASK 0xC0  /* bits for status                   */

#define  ISDN_NET_DM_OFF        0x00    /* this interface is stopped      */

#define  ISDN_NET_DM_MANUAL     0x40    /* this interface is on (manual)  */

#define  ISDN_NET_DM_AUTO       0x80    /* this interface is autodial     */

#define ISDN_NET_DIALMODE(x) ((&(x))->flags & ISDN_NET_DIALMODE_MASK)

#ifdef __KERNEL__

#ifndef STANDALONE

#include <linux/config.h>

#endif

#include <linux/errno.h>

#include <linux/fs.h>

#include <linux/major.h>

#include <asm/segment.h>

#include <asm/io.h>

#include <linux/kernel.h>

#include <linux/signal.h>

#include <linux/malloc.h>

#include <linux/timer.h>

#include <linux/wait.h>

#include <linux/tty.h>

#include <linux/tty_flip.h>

#include <linux/serial_reg.h>

#include <linux/fcntl.h>

#include <linux/types.h>

#include <linux/interrupt.h>

#include <linux/ip.h>

#include <linux/in.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/skbuff.h>

#include <linux/tcp.h>

#ifdef CONFIG_ISDN_PPP

#ifdef CONFIG_ISDN_PPP_VJ

#  include <net/slhc_vj.h>

#endif

#include <linux/ppp_defs.h>

#include <linux/if_ppp.h>

#include <linux/if_pppvar.h>

#include <linux/isdn_ppp.h>

#endif

#include <linux/isdnif.h>

#define ISDN_DRVIOCTL_MASK       0x7f  /* Mask for Device-ioctl */

/* Until now unused */

#define ISDN_SERVICE_VOICE 1

#define ISDN_SERVICE_AB    1<<1 

#define ISDN_SERVICE_X21   1<<2

#define ISDN_SERVICE_G4    1<<3

#define ISDN_SERVICE_BTX   1<<4

#define ISDN_SERVICE_DFUE  1<<5

#define ISDN_SERVICE_X25   1<<6

#define ISDN_SERVICE_TTX   1<<7

#define ISDN_SERVICE_MIXED 1<<8

#define ISDN_SERVICE_FW    1<<9

#define ISDN_SERVICE_GTEL  1<<10

#define ISDN_SERVICE_BTXN  1<<11

#define ISDN_SERVICE_BTEL  1<<12

/* Macros checking plain usage */

#define USG_NONE(x)         ((x & ISDN_USAGE_MASK)==ISDN_USAGE_NONE)

#define USG_RAW(x)          ((x & ISDN_USAGE_MASK)==ISDN_USAGE_RAW)

#define USG_MODEM(x)        ((x & ISDN_USAGE_MASK)==ISDN_USAGE_MODEM)

#define USG_VOICE(x)        ((x & ISDN_USAGE_MASK)==ISDN_USAGE_VOICE)

#define USG_NET(x)          ((x & ISDN_USAGE_MASK)==ISDN_USAGE_NET)

#define USG_OUTGOING(x)     ((x & ISDN_USAGE_OUTGOING)==ISDN_USAGE_OUTGOING)

#define USG_MODEMORVOICE(x) (((x & ISDN_USAGE_MASK)==ISDN_USAGE_MODEM) || \

                             ((x & ISDN_USAGE_MASK)==ISDN_USAGE_VOICE)     )

/* Timer-delays and scheduling-flags */

#define ISDN_TIMER_RES       3                     /* Main Timer-Resolution  */

#define ISDN_TIMER_02SEC     (HZ/(ISDN_TIMER_RES+1)/5) /* Slow-Timer1 .2 sec */

#define ISDN_TIMER_1SEC      (HZ/(ISDN_TIMER_RES+1)) /* Slow-Timer2 1 sec   */

#define ISDN_TIMER_RINGING   5 /* tty RINGs = ISDN_TIMER_1SEC * this factor */

#define ISDN_TIMER_MODEMREAD 1

#define ISDN_TIMER_MODEMPLUS 2

#define ISDN_TIMER_MODEMRING 4

#define ISDN_TIMER_MODEMXMIT 8

#define ISDN_TIMER_NETDIAL   16

#define ISDN_TIMER_NETHANGUP 32

#define ISDN_TIMER_IPPP      64

#define ISDN_TIMER_FAST      (ISDN_TIMER_MODEMREAD | ISDN_TIMER_MODEMPLUS | \

                              ISDN_TIMER_MODEMXMIT)

#define ISDN_TIMER_SLOW      (ISDN_TIMER_MODEMRING | ISDN_TIMER_NETHANGUP | \

                              ISDN_TIMER_NETDIAL)

/* Timeout-Values for isdn_net_dial() */

#define ISDN_TIMER_DTIMEOUT10 (10*HZ/(ISDN_TIMER_02SEC*(ISDN_TIMER_RES+1)))

#define ISDN_TIMER_DTIMEOUT15 (15*HZ/(ISDN_TIMER_02SEC*(ISDN_TIMER_RES+1)))

#define ISDN_TIMER_DTIMEOUT60 (60*HZ/(ISDN_TIMER_02SEC*(ISDN_TIMER_RES+1)))

/* GLOBAL_FLAGS */

#define ISDN_GLOBAL_STOPPED 1

/*=================== Start of ip-over-ISDN stuff =========================*/

/* Feature- and status-flags for a net-interface */

#define ISDN_NET_CONNECTED  0x01       /* Bound to ISDN-Channel             */

#define ISDN_NET_SECURE     0x02       /* Accept calls from phonelist only  */

#define ISDN_NET_CALLBACK   0x04       /* activate callback                 */

#define ISDN_NET_CBHUP      0x08       /* hangup before callback            */

#define ISDN_NET_CBOUT      0x10       /* remote machine does callback      */

#if 0

/* Unused??? */

#define ISDN_NET_CLONE      0x08       /* clone a tmp interface when called */

#define ISDN_NET_TMP        0x10       /* tmp interface until getting an IP */

#define ISDN_NET_DYNAMIC    0x20       /* this link is dynamically allocated */

#endif

/*

 * also see the ISDN_NET_DM_* defines earlier

 * (they are not here, as we need access to those in userspace)

 */

#define ISDN_NET_MAGIC      0x49344C02 /* for paranoia-checking             */

/* Phone-list-element */

typedef struct {

  void *next;

  char num[ISDN_MSNLEN];

} isdn_net_phone;

/* Local interface-data */

typedef struct isdn_net_local_s {

  ulong                  magic;

  char                   name[10];     /* Name of device                   */

  struct enet_statistics stats;        /* Ethernet Statistics              */

  int                    isdn_device;  /* Index to isdn-device             */

  int                    isdn_channel; /* Index to isdn-channel            */

  int                    ppp_slot;     /* PPPD device slot number          */

  int                    pre_device;   /* Preselected isdn-device          */

  int                    pre_channel;  /* Preselected isdn-channel         */

  int                    exclusive;    /* If non-zero idx to reserved chan.*/

  int                    flags;        /* Connection-flags                 */

  int                    dialretry;    /* Counter for Dialout-retries      */

  int                    dialmax;      /* Max. Number of Dial-retries      */

  int                    cbdelay;      /* Delay before Callback starts     */

  int                    dtimer;       /* Timeout-counter for dialing      */

  char                   msn[ISDN_MSNLEN]; /* MSNs/EAZs for this interface */

  u_char                 cbhup;        /* Flag: Reject Call before Callback*/

  u_char                 dialstate;    /* State for dialing                */

  u_char                 p_encap;      /* Packet encapsulation             */

                                       /*   0 = Ethernet over ISDN         */

                                       /*   1 = RAW-IP                     */

                                       /*   2 = IP with type field         */

  u_char                 l2_proto;     /* Layer-2-protocol                 */

                                       /* See ISDN_PROTO_L2..-constants in */

                                       /* isdnif.h                         */

                                       /*   0 = X75/LAPB with I-Frames     */

                                       /*   1 = X75/LAPB with UI-Frames    */

                                       /*   2 = X75/LAPB with BUI-Frames   */

                                       /*   3 = HDLC                       */

  u_char                 l3_proto;     /* Layer-3-protocol                 */

                                       /* See ISDN_PROTO_L3..-constants in */

                                       /* isdnif.h                         */

                                       /*   0 = Transparent                */

  int                    huptimer;     /* Timeout-counter for auto-hangup  */

  int                    charge;       /* Counter for charging units       */

  int                    chargetime;   /* Timer for Charging info          */

  int                    hupflags;     /* Flags for charge-unit-hangup:    */

                                       /* bit0: chargeint is invalid       */

                                       /* bit1: Getting charge-interval    */

                                       /* bit2: Do charge-unit-hangup      */

                                       /* bit3: Do hangup even on incoming */

  int                    outgoing;     /* Flag: outgoing call              */

  int                    onhtime;      /* Time to keep link up             */

  int                    chargeint;    /* Interval between charge-infos    */

  int                    onum;         /* Flag: at least 1 outgoing number */

  int                    cps;          /* current speed of this interface  */

  int                    transcount;   /* byte-counter for cps-calculation */

  int                    sqfull;       /* Flag: netdev-queue overloaded    */

  ulong                  sqfull_stamp; /* Start-Time of overload           */

  ulong                  slavedelay;   /* Dynamic bundling delaytime       */

  int                                   triggercps;     /* BogoCPS needed for triggering slave   */

  struct device          *srobin;      /* Ptr to Master device for slaves  */

  isdn_net_phone         *phone[2];    /* List of remote-phonenumbers      */

                                       /* phone[0] = Incoming Numbers      */

                                       /* phone[1] = Outgoing Numbers      */

  isdn_net_phone         *dial;        /* Pointer to dialed number         */

  struct device          *master;      /* Ptr to Master device for slaves  */

  struct device          *slave;       /* Ptr to Slave device for masters  */

  struct isdn_net_local_s *next;       /* Ptr to next link in bundle       */

  struct isdn_net_local_s *last;       /* Ptr to last link in bundle       */

  struct isdn_net_dev_s  *netdev;      /* Ptr to netdev                    */

  struct sk_buff         *first_skb;   /* Ptr to skb that triggers dialing */

  struct sk_buff         *sav_skb;     /* Ptr to skb, rejected by LL-driver*/

#if (LINUX_VERSION_CODE < 0x02010F)

                                       /* Ptr to orig. header_cache_bind   */

  void                   (*org_hcb)(struct hh_cache **,

                                    struct device *,

                                    unsigned short,

                                    __u32);

#else

#if (LINUX_VERSION_CODE < 0x2011E)

                                       /* Ptr to orig. hard_header_cache   */

  int                    (*org_hhc)(struct dst_entry *dst,

                                    struct dst_entry *neigh,

                                    struct hh_cache *hh);

#else

                                       /* Ptr to orig. hard_header_cache   */

  int                    (*org_hhc)(struct dst_entry *dst,

                                    struct neighbour *neigh,

                                    struct hh_cache *hh);

#endif

#endif

                                       /* Ptr to orig. header_cache_update */

  void                   (*org_hcu)(struct hh_cache *,

                                    struct device *,

                                    unsigned char *);

  int  pppbind;                        /* ippp device for bindings         */

  int                                   dialtimeout;    /* How long shall we try on dialing? (jiffies) */

  int                   dialwait;               /* How long shall we wait after failed attempt? (jiffies) */

  ulong                 dialstarted;    /* jiffies of first dialing-attempt */

  ulong                 dialwait_timer; /* jiffies of earliest next dialing-attempt */

  int                   huptimeout;     /* How long will the connection be up? (seconds) */

} isdn_net_local;

#ifdef CONFIG_ISDN_PPP

struct ippp_bundle {

  int mp_mrru;                        /* unused                             */

  struct mpqueue *last;               /* currently defined in isdn_net_dev  */

  int min;                            /* currently calculated 'on the fly'  */

  long next_num;                      /* we wanna see this seq.-number next */

  struct sqqueue *sq;

  int modify:1;                       /* set to 1 while modifying sqqueue   */

  int bundled:1;                      /* bundle active ?                    */

};

#endif

/* the interface itself */

typedef struct isdn_net_dev_s {

  isdn_net_local  local;

  isdn_net_local *queue;

  void           *next;                /* Pointer to next isdn-interface   */

  struct device   dev;                 /* interface to upper levels        */

#ifdef CONFIG_ISDN_PPP

  struct mpqueue *mp_last;

  struct ippp_bundle ib;

#endif

} isdn_net_dev;

/*===================== End of ip-over-ISDN stuff ===========================*/

/*======================= Start of ISDN-tty stuff ===========================*/

#define ISDN_ASYNC_MAGIC          0x49344C01 /* for paranoia-checking        */

#define ISDN_ASYNC_INITIALIZED    0x80000000 /* port was initialized         */

#define ISDN_ASYNC_CALLOUT_ACTIVE 0x40000000 /* Call out device active       */

#define ISDN_ASYNC_NORMAL_ACTIVE  0x20000000 /* Normal device active         */

#define ISDN_ASYNC_CLOSING        0x08000000 /* Serial port is closing       */

#define ISDN_ASYNC_CTS_FLOW       0x04000000 /* Do CTS flow control          */

#define ISDN_ASYNC_CHECK_CD       0x02000000 /* i.e., CLOCAL                 */

#define ISDN_ASYNC_HUP_NOTIFY         0x0001 /* Notify tty on hangups/closes */

#define ISDN_ASYNC_SESSION_LOCKOUT    0x0100 /* Lock cua opens on session    */

#define ISDN_ASYNC_PGRP_LOCKOUT       0x0200 /* Lock cua opens on pgrp       */

#define ISDN_ASYNC_CALLOUT_NOHUP      0x0400 /* No hangup for cui            */

#define ISDN_ASYNC_SPLIT_TERMIOS      0x0008 /* Sep. termios for dialin/out  */

#define ISDN_SERIAL_XMIT_SIZE           1024 /* default bufsize for write    */

#define ISDN_SERIAL_XMIT_MAX            4000 /* Maximum bufsize for write    */

#define ISDN_SERIAL_TYPE_NORMAL            1

#define ISDN_SERIAL_TYPE_CALLOUT           2

#ifdef CONFIG_ISDN_AUDIO

/* For using sk_buffs with audio we need some private variables

 * within each sk_buff. For this purpose, we declare a struct here,

 * and put it always at skb->head. A few macros help accessing the

 * variables. Of course, we need to check skb_headroom prior to

 * any access.

 */

typedef struct isdn_audio_skb {

  unsigned short dle_count;

  unsigned char  lock;

} isdn_audio_skb;

#define ISDN_AUDIO_SKB_DLECOUNT(skb) (((isdn_audio_skb*)skb->head)->dle_count)

#define ISDN_AUDIO_SKB_LOCK(skb) (((isdn_audio_skb*)skb->head)->lock)

#endif

/* Private data of AT-command-interpreter */

typedef struct atemu {

  u_char              profile[ISDN_MODEM_ANZREG]; /* Modem-Regs. Profile 0 */

  u_char              mdmreg[ISDN_MODEM_ANZREG];  /* Modem-Registers       */

  char                pmsn[ISDN_MSNLEN]; /* EAZ/MSNs Profile 0             */

  char                msn[ISDN_MSNLEN];/* EAZ/MSN                          */

#ifdef CONFIG_ISDN_AUDIO

  u_char              vpar[10];        /* Voice-parameters                 */

  int                 lastDLE;         /* Flag for voice-coding: DLE seen  */

#endif

  int                 mdmcmdl;         /* Length of Modem-Commandbuffer    */

  int                 pluscount;       /* Counter for +++ sequence         */

  int                 lastplus;        /* Timestamp of last +              */

  char                mdmcmd[255];     /* Modem-Commandbuffer              */

} atemu;

/* Private data (similar to async_struct in <linux/serial.h>) */

typedef struct modem_info {

  int                   magic;

  int                   flags;           /* defined in tty.h               */

  int                   x_char;          /* xon/xoff character             */

  int                   mcr;             /* Modem control register         */

  int                   msr;             /* Modem status register          */

  int                   lsr;             /* Line status register           */

  int                   line;

  int                   count;           /* # of fd on device              */

  int                   blocked_open;    /* # of blocked opens             */

  long                  session;         /* Session of opening process     */

  long                  pgrp;            /* pgrp of opening process        */

  int                   online;          /* 1 = B-Channel is up, drop data */

                                         /* 2 = B-Channel is up, deliver d.*/

  int                   dialing;         /* Dial in progress               */

  int                   rcvsched;        /* Receive needs schedule         */

  int                   isdn_driver;     /* Index to isdn-driver           */

  int                   isdn_channel;    /* Index to isdn-channel          */

  int                   drv_index;       /* Index to dev->usage            */

  int                   ncarrier;        /* Flag: schedule NO CARRIER      */

  unsigned char         last_cause[8];   /* Last cause message             */

  unsigned char         last_num[ISDN_MSNLEN];

                                         /* Last phone-number              */

  unsigned char         last_l2;         /* Last layer-2 protocol          */

  unsigned char         last_si;         /* Last service                   */

  unsigned char         last_lhup;       /* Last hangup local?             */

  unsigned char         last_dir;        /* Last direction (in or out)     */

  struct timer_list     nc_timer;        /* Timer for delayed NO CARRIER   */

  int                   send_outstanding;/* # of outstanding send-requests */

  int                   xmit_size;       /* max. # of chars in xmit_buf    */

  int                   xmit_count;      /* # of chars in xmit_buf         */

  unsigned char         *xmit_buf;       /* transmit buffer                */

  struct sk_buff_head   xmit_queue;      /* transmit queue                 */

#ifdef CONFIG_ISDN_AUDIO

  int                   vonline;         /* Voice-channel status           */

                                         /* Bit 0 = recording              */

                                         /* Bit 1 = playback               */

                                         /* Bit 2 = playback, DLE-ETX seen */

  struct sk_buff_head   dtmf_queue;      /* queue for dtmf results         */

  void                  *adpcms;         /* state for adpcm decompression  */

  void                  *adpcmr;         /* state for adpcm compression    */

  void                  *dtmf_state;     /* state for dtmf decoder         */

  void                  *silence_state;  /* state for silence detection    */

#endif

  struct tty_struct     *tty;            /* Pointer to corresponding tty   */

  atemu                 emu;             /* AT-emulator data               */

  struct termios        normal_termios;  /* For saving termios structs     */

  struct termios        callout_termios;

  struct wait_queue     *open_wait;

  struct wait_queue     *close_wait;

} modem_info;

#define ISDN_MODEM_WINSIZE 8

/* Description of one ISDN-tty */

typedef struct {

  int                refcount;                     /* Number of opens        */

  struct tty_driver  tty_modem;                    /* tty-device             */

  struct tty_driver  cua_modem;                    /* cua-device             */

  struct tty_struct  *modem_table[ISDN_MAX_CHANNELS]; /* ?? copied from Orig */

  struct termios     *modem_termios[ISDN_MAX_CHANNELS];

  struct termios     *modem_termios_locked[ISDN_MAX_CHANNELS];

  modem_info         info[ISDN_MAX_CHANNELS];      /* Private data           */

} modem;

/*======================= End of ISDN-tty stuff ============================*/

/*======================= Start of sync-ppp stuff ==========================*/

#define NUM_RCV_BUFFS     64

#define PPP_HARD_HDR_LEN 4

#ifdef CONFIG_ISDN_PPP

struct sqqueue {

  struct sqqueue *next;

  long sqno_start;

  long sqno_end;

  struct sk_buff *skb;

  long timer;

};

struct mpqueue {

  struct mpqueue *next;

  struct mpqueue *last;

  long    sqno;

  struct sk_buff *skb;

  int BEbyte;

  unsigned long time;

};

struct ippp_buf_queue {

  struct ippp_buf_queue *next;

  struct ippp_buf_queue *last;

  char *buf;                 /* NULL here indicates end of queue */

  int len;

};

struct ippp_struct {

  struct ippp_struct *next_link;

  int state;

  struct ippp_buf_queue rq[NUM_RCV_BUFFS]; /* packet queue for isdn_ppp_read() */

  struct ippp_buf_queue *first;  /* pointer to (current) first packet */

  struct ippp_buf_queue *last;   /* pointer to (current) last used packet in queue */

  struct wait_queue *wq;

  struct wait_queue *wq1;

  struct task_struct *tk;

  unsigned int mpppcfg;

  unsigned int pppcfg;

  unsigned int mru;

  unsigned int mpmru;

  unsigned int mpmtu;

  unsigned int maxcid;

  isdn_net_local *lp;

  int unit;

  int minor;

  long last_link_seqno;

  long mp_seqno;

  long range;

#ifdef CONFIG_ISDN_PPP_VJ

  unsigned char *cbuf;

  struct slcompress *slcomp;

#endif

  unsigned long debug;

  struct isdn_ppp_compressor *compressor, *link_compressor;

  void *decomp_stat,*comp_stat,*link_decomp_stat,*link_comp_stat;

#ifdef ISDN_SYNCPPP_READDRESS

  unsigned long old_pa_addr;

  unsigned long old_pa_dstaddr;

#endif

};

#endif

/*======================== End of sync-ppp stuff ===========================*/

/*======================= Start of general stuff ===========================*/

typedef struct {

  char *next;

  char *private;

} infostruct;

#define DRV_FLAG_RUNNING 1