/* $Id: isdn_net.c,v 1.37 1997/02/11 18:32:51 fritz Exp $

 * Linux ISDN subsystem, network interfaces and related functions (linklevel).
 *
 * Copyright 1994,95,96 by Fritz Elfert (fritz@wuemaus.franken.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: isdn_net.c,v $
 * Revision 1.37  1997/02/11 18:32:51  fritz
 * Bugfix in isdn_ppp_free_mpqueue().
 *
 * Revision 1.36  1997/02/10 21:31:11  fritz
 * Changed setup-interface (incoming and outgoing).
 *
 * Revision 1.35  1997/02/10 20:12:45  fritz
 * Changed interface for reporting incoming calls.
 *
 * Revision 1.34  1997/02/03 23:15:07  fritz
 * Reformatted according CodingStyle.
 * replaced arp_find prototype by proper include.
 * made dev_purge_queues static.
 * Bugfix in bogocps calculation.
 * removed isdn_net_receive_callback - was never used ;-)
 * Misc. fixes for Kernel 2.1.X comaptibility.
 *
 * Revision 1.33  1997/01/17 01:19:25  fritz
 * Applied chargeint patch.
 *
 * Revision 1.32  1997/01/14 01:29:31  fritz
 * Bugfix: isdn_net_hangup() did not reset ISDN_NET_CONNECTED.
 *
 * Revision 1.31  1997/01/11 23:30:42  fritz
 * Speed up dial statemachine.
 *
 * Revision 1.30  1996/11/25 17:20:50  hipp
 * fixed pppbind bug in isdn_net_find_icall()
 *
 * Revision 1.29  1996/11/13 02:31:38  fritz
 * Minor cleanup.
 *
 * Revision 1.28  1996/10/27 20:49:06  keil
 * bugfix to compile without MPP
 *
 * Revision 1.27  1996/10/25 18:46:01  fritz
 * Another bugfix in isdn_net_autohup()
 *
 * Revision 1.26  1996/10/23 23:05:36  fritz
 * Bugfix: Divide by zero in isdn_net_autohup()
 *
 * Revision 1.25  1996/10/22 23:13:58  fritz
 * Changes for compatibility to 2.0.X and 2.1.X kernels.
 *
 * Revision 1.24  1996/10/11 13:57:40  fritz
 * Bugfix: Error in BogoCPS calculation.
 *
 * Revision 1.23  1996/09/23 01:58:08  fritz
 * Fix: With syncPPP encapsulation, discard LCP packets
 *      when calculating hangup timeout.
 *
 * Revision 1.22  1996/09/23 00:03:37  fritz
 * Fix: did not compile without CONFIG_ISDN_PPP
 *
 * Revision 1.21  1996/09/07 12:44:50  hipp
 * (hopefully) fixed callback problem with syncPPP
 * syncPPP network devices now show PPP link encap
 *
 * Revision 1.20  1996/08/29 20:06:03  fritz
 * Bugfix: Transmission timeout had been much to low.
 *
 * Revision 1.19  1996/08/12 16:24:32  hipp
 * removed some (now) obsolete functions for syncPPP in rebuild_header etc.
 *
 * Revision 1.18  1996/07/03 13:48:51  hipp
 * bugfix: Call dev_purge_queues() only for master device
 *
 * Revision 1.17  1996/06/25 18:37:37  fritz
 * Fixed return count for empty return string in isdn_net_getphones().
 *
 * Revision 1.16  1996/06/24 17:48:08  fritz
 * Bugfixes:
 *   - Did not free channel on unbinding.
 *   - ioctl returned wrong callback settings.
 *
 * Revision 1.15  1996/06/16 17:42:54  tsbogend
 * fixed problem with IP addresses on Linux/Alpha (long is 8 byte there)
 *
 * Revision 1.14  1996/06/11 14:54:08  hipp
 * minor bugfix in isdn_net_send_skb
 * changes in BSENT callback handler for syncPPP
 * added lp->sav_skb stuff
 *
 * Revision 1.13  1996/06/06 14:25:44  fritz
 * Changed loglevel of "incoming ... without OAD" message, since
 * with audio support this is quite normal.
 *
 * Revision 1.12  1996/06/05 02:36:45  fritz
 * Minor bugfixes by M. Hipp.
 *
 * Revision 1.11  1996/05/18 01:36:59  fritz
 * Added spelling corrections and some minor changes
 * to stay in sync with kernel.
 *
 * Revision 1.10  1996/05/17 03:49:01  fritz
 * Some cleanup.
 *
 * Revision 1.9  1996/05/06 11:34:57  hipp
 * fixed a few bugs
 *
 * Revision 1.8  1996/04/30 21:04:40  fritz
 * Test commit
 *
 * Revision 1.7  1996/04/30 11:10:42  fritz
 * Added Michael's ippp-bind patch.
 *
 * Revision 1.6  1996/04/30 09:34:35  fritz
 * Removed compatibility-macros.
 *
 * Revision 1.5  1996/04/20 16:28:38  fritz
 * Made more parameters of the dial statemachine user-configurable and
 * added hangup after dial for more reliability using callback.
 * Changed all io going through generic routines in isdn_common.c
 * Added missing call to dev_free_skb on failed dialing.
 * Added uihdlc encapsulation.
 * Fixed isdn_net_setcfg not to destroy interface-flags anymore.
 * Misc. typos.
 *
 * Revision 1.4  1996/02/19 15:23:38  fritz
 * Bugfix: Sync-PPP packets got compressed twice, when resent due to
 *         send-queue-full reject.
 *
 * Revision 1.3  1996/02/11 02:22:28  fritz
 * Changed status- receive-callbacks to use pointer-arrays for finding
 * a corresponding interface instead of looping over all interfaces.
 * Activate Auto-hangup-timer only when interface is online.
 * Some bugfixes in the dialing-statemachine.
 * Lot of bugfixes in sk_buff'ized encapsulation handling.
 * For speedup connection-setup after dialing, remember sk_buf that triggered
 * dialing.
 * Fixed isdn_net_log_packet according to different encapsulations.
 * Correct ARP-handling for ETHERNET-encapsulation.
 *
 * Revision 1.2  1996/01/22 05:05:12  fritz
 * Changed returncode-logic for isdn_net_start_xmit() and its
 * helper-functions.
 * Changed handling of buildheader for RAWIP and ETHERNET-encapsulation.
 *
 * Revision 1.1  1996/01/09 04:12:34  fritz
 * Initial revision
 *
 */

#include <linux/config.h>
#define __NO_VERSION__
#include <linux/module.h>
#include <linux/isdn.h>
#include <linux/if_arp.h>
#include <net/arp.h>
#include "isdn_common.h"
#include "isdn_net.h"
#ifdef CONFIG_ISDN_PPP
#include "isdn_ppp.h"
#endif

/* Prototypes */

int isdn_net_force_dial_lp(isdn_net_local *);
static int isdn_net_wildmat(char *s, char *p);
static int isdn_net_start_xmit(struct sk_buff *, struct device *);
static int isdn_net_xmit(struct device *, isdn_net_local *, struct sk_buff *);
static void dev_purge_queues(struct device *dev);	/* move this to net/core/dev.c */

char *isdn_net_revision = "$Revision: 1.37 $";

 /*
  * Code for raw-networking over ISDN
  */

static void
isdn_net_reset(struct device *dev)
{
	ulong flags;

	save_flags(flags);
	cli();                  /* Avoid glitch on writes to CMD regs */
	dev->interrupt = 0;
	dev->tbusy = 0;
	restore_flags(flags);
}

/* Open/initialize the board. */
static int
isdn_net_open(struct device *dev)
{
	int i;
	struct device *p;

	isdn_net_reset(dev);
	dev->start = 1;
	/* Fill in the MAC-level header. */
	for (i = 0; i < ETH_ALEN - sizeof(u32); i++)
		dev->dev_addr[i] = 0xfc;
	memcpy(&(dev->dev_addr[i]), &dev->pa_addr, sizeof(u32));

	/* If this interface has slaves, start them also */

	if ((p = (((isdn_net_local *) dev->priv)->slave))) {
		while (p) {
			isdn_net_reset(p);
			p->start = 1;
			p = (((isdn_net_local *) p->priv)->slave);
		}
	}
	isdn_MOD_INC_USE_COUNT();
	return 0;
}

/*
 * Assign an ISDN-channel to a net-interface
 */
static void
isdn_net_bind_channel(isdn_net_local * lp, int idx)
{
	ulong flags;

	save_flags(flags);
	cli();
	lp->isdn_device = dev->drvmap[idx];
	lp->isdn_channel = dev->chanmap[idx];
	dev->rx_netdev[idx] = lp->netdev;
	dev->st_netdev[idx] = lp->netdev;
	restore_flags(flags);
}

/*
 * unbind a net-interface (resets interface after an error)
 */
static void
isdn_net_unbind_channel(isdn_net_local * lp)
{
	ulong flags;

	save_flags(flags);
	cli();
	if (lp->first_skb) {
		dev_kfree_skb(lp->first_skb, FREE_WRITE);
		lp->first_skb = NULL;
	}
	if (lp->sav_skb) {
		dev_kfree_skb(lp->sav_skb, FREE_WRITE);
		lp->sav_skb = NULL;
	}
	if (!lp->master)        /* purge only for master device */
		dev_purge_queues(&lp->netdev->dev);
	lp->dialstate = 0;
	dev->rx_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
	dev->st_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
	isdn_free_channel(lp->isdn_device, lp->isdn_channel, ISDN_USAGE_NET);
	lp->flags &= ~ISDN_NET_CONNECTED;
	lp->isdn_device = -1;
	lp->isdn_channel = -1;

	restore_flags(flags);
}

/*
 * Perform auto-hangup and cps-calculation for net-interfaces.
 *
 * auto-hangup:
 * Increment idle-counter (this counter is reset on any incoming or
 * outgoing packet), if counter exceeds configured limit either do a
 * hangup immediately or - if configured - wait until just before the next
 * charge-info.
 *
 * cps-calculation (needed for dynamic channel-bundling):
 * Since this function is called every second, simply reset the
 * byte-counter of the interface after copying it to the cps-variable.
 */
unsigned long last_jiffies = -HZ;

void
isdn_net_autohup()
{
	isdn_net_dev *p = dev->netdev;
	int anymore;

	anymore = 0;
	while (p) {
		isdn_net_local *l = (isdn_net_local *) & (p->local);
		if ((jiffies - last_jiffies) == 0)
			l->cps = l->transcount;
		else
			l->cps = (l->transcount * HZ) / (jiffies - last_jiffies);
		l->transcount = 0;
		if (dev->net_verbose > 3)
			printk(KERN_DEBUG "%s: %d bogocps\n", l->name, l->cps);
		if ((l->flags & ISDN_NET_CONNECTED) && (!l->dialstate)) {
			anymore = 1;
			l->huptimer++;
			if ((l->onhtime) && (l->huptimer > l->onhtime))
				if (l->hupflags & ISDN_MANCHARGE &&
				    l->hupflags & ISDN_CHARGEHUP) {
					while (jiffies - l->chargetime > l->chargeint)
						l->chargetime += l->chargeint;
					if (jiffies - l->chargetime >= l->chargeint - 2 * HZ)
						if (l->outgoing || l->hupflags & ISDN_INHUP)
							isdn_net_hangup(&p->dev);
				} else if (l->outgoing) {
					if (l->hupflags & ISDN_CHARGEHUP) {
						if (l->hupflags & ISDN_WAITCHARGE) {
							printk(KERN_DEBUG "isdn_net: Hupflags of %s are %X\n",
							       l->name, l->hupflags);
							isdn_net_hangup(&p->dev);
						} else if (jiffies - l->chargetime > l->chargeint) {
							printk(KERN_DEBUG
							       "isdn_net: %s: chtime = %d, chint = %d\n",
							       l->name, l->chargetime, l->chargeint);
							isdn_net_hangup(&p->dev);
						}
					} else
						isdn_net_hangup(&p->dev);
				} else if (l->hupflags & ISDN_INHUP)
					isdn_net_hangup(&p->dev);
		}
		p = (isdn_net_dev *) p->next;
	}
	last_jiffies = jiffies;
	isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, anymore);
}

/*
 * Handle status-messages from ISDN-interfacecard.
 * This function is called from within the main-status-dispatcher
 * isdn_status_callback, which itself is called from the low-level driver.
 * Return: 1 = Event handled, 0 = not for us or unknown Event.
 */
int
isdn_net_stat_callback(int idx, int cmd)
{
	isdn_net_dev *p = dev->st_netdev[idx];

	if (p) {
		isdn_net_local *lp = &(p->local);
		switch (cmd) {
			case ISDN_STAT_BSENT:
				/* A packet has successfully been sent out */
				if ((lp->flags & ISDN_NET_CONNECTED) &&
				    (!lp->dialstate)) {
					lp->stats.tx_packets++;
					if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP && lp->sav_skb) {
						struct device *mdev;
						if (lp->master)
							mdev = lp->master;
						else
							mdev = &lp->netdev->dev;
						if (!isdn_net_send_skb(mdev, lp, lp->sav_skb)) {
							lp->sav_skb = NULL;
							mark_bh(NET_BH);
						} else {
							return 1;
						}
					}
					if (clear_bit(0, (void *) &(p->dev.tbusy)))
						mark_bh(NET_BH);
				}
				return 1;
			case ISDN_STAT_DCONN:
				/* D-Channel is up */
				switch (lp->dialstate) {
					case 4:
					case 7:
					case 8:
						lp->dialstate++;
						return 1;
					case 12:
						lp->dialstate = 5;
						return 1;
				}
				break;
			case ISDN_STAT_DHUP:
				/* Either D-Channel-hangup or error during dialout */
				if ((!lp->dialstate) && (lp->flags & ISDN_NET_CONNECTED)) {
					lp->flags &= ~ISDN_NET_CONNECTED;
					if (lp->first_skb) {
						dev_kfree_skb(lp->first_skb, FREE_WRITE);
						lp->first_skb = NULL;
					}
					if (lp->sav_skb) {
						dev_kfree_skb(lp->sav_skb, FREE_WRITE);
						lp->sav_skb = NULL;
					}
					isdn_free_channel(lp->isdn_device, lp->isdn_channel,
							  ISDN_USAGE_NET);
#ifdef CONFIG_ISDN_PPP
					isdn_ppp_free(lp);
#endif
					isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
					printk(KERN_INFO "%s: remote hangup\n", lp->name);
					printk(KERN_INFO "%s: Chargesum is %d\n", lp->name,
					       lp->charge);
					lp->isdn_device = -1;
					lp->isdn_channel = -1;
					dev->st_netdev[idx] = NULL;
					dev->rx_netdev[idx] = NULL;
					return 1;
				}
				break;
			case ISDN_STAT_BCONN:
				/* B-Channel is up */
				switch (lp->dialstate) {
					case 5:
					case 6:
					case 7:
					case 8:
					case 9:
					case 10:
					case 12:
						if (lp->dialstate <= 6) {
							dev->usage[idx] |= ISDN_USAGE_OUTGOING;
							isdn_info_update();
						} else
							dev->rx_netdev[idx] = p;
						lp->dialstate = 0;
						isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 1);
						printk(KERN_INFO "isdn_net: %s connected\n", lp->name);
						/* If first Chargeinfo comes before B-Channel connect,
						 * we correct the timestamp here.
						 */
						lp->chargetime = jiffies;
						printk(KERN_DEBUG "isdn_net: chargetime of %s now %d\n",
						lp->name, lp->chargetime);
						/* Immediately send first skb to speed up arp */
#ifdef CONFIG_ISDN_PPP
						if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
							isdn_ppp_wakeup_daemon(lp);
#endif
						if (lp->first_skb) {
							if (!(isdn_net_xmit(&p->dev, lp, lp->first_skb)))
								lp->first_skb = NULL;
						}
						return 1;
				}
				break;
			case ISDN_STAT_NODCH:
				/* No D-Channel avail. */
				if (lp->dialstate == 4) {
					lp->dialstate--;
					return 1;
				}
				break;
			case ISDN_STAT_CINF:
				/* Charge-info from TelCo. Calculate interval between
				 * charge-infos and set timestamp for last info for
				 * usage by isdn_net_autohup()
				 */
				lp->charge++;
				if (lp->hupflags & ISDN_HAVECHARGE) {
					lp->hupflags &= ~ISDN_WAITCHARGE;
					lp->chargeint = jiffies - lp->chargetime - (2 * HZ);
				}
				if (lp->hupflags & ISDN_WAITCHARGE)
					lp->hupflags |= ISDN_HAVECHARGE;
				lp->chargetime = jiffies;
				printk(KERN_DEBUG "isdn_net: Got CINF chargetime of %s now %d\n",
				       lp->name, lp->chargetime);
				return 1;
		}
	}
	return 0;
}

/*
 * Check, if a number contains wildcard-characters, in which case it
 * is for incoming purposes only.
 */
static int
isdn_net_checkwild(char *num)
{
	return ((strchr(num, '?')) ||
		(strchr(num, '*')) ||
		(strchr(num, '[')) ||
		(strchr(num, ']')) ||
		(strchr(num, '^')));
}

/*
 * Perform dialout for net-interfaces and timeout-handling for
 * D-Channel-up and B-Channel-up Messages.
 * This function is initially called from within isdn_net_start_xmit() or
 * or isdn_net_find_icall() after initializing the dialstate for an
 * interface. If further calls are needed, the function schedules itself
 * for a timer-callback via isdn_timer_function().
 * The dialstate is also affected by incoming status-messages from
 * the ISDN-Channel which are handled in isdn_net_stat_callback() above.
 */
void
isdn_net_dial(void)
{
	isdn_net_dev *p = dev->netdev;
	int anymore = 0;
	int i;
	isdn_ctrl cmd;

	while (p) {
#ifdef ISDN_DEBUG_NET_DIAL
		if (p->local.dialstate)
			printk(KERN_DEBUG "%s: dialstate=%d\n", p->local.name, p->local.dialstate);
#endif
		switch (p->local.dialstate) {
			case 0:
				/* Nothing to do for this interface */
				break;
			case 1:
				/* Initiate dialout. Set phone-number-pointer to first number
				 * of interface.
				 */
				p->local.dial = p->local.phone[1];
				anymore = 1;
				p->local.dialstate++;
				/* Fall through */
			case 2:
				/* Prepare dialing. Clear EAZ, then set EAZ. */
				cmd.driver = p->local.isdn_device;
				cmd.arg = p->local.isdn_channel;
				cmd.command = ISDN_CMD_CLREAZ;
				dev->drv[p->local.isdn_device]->interface->command(&cmd);
				sprintf(cmd.parm.num, "%s", isdn_map_eaz2msn(p->local.msn, cmd.driver));
				cmd.command = ISDN_CMD_SETEAZ;
				dev->drv[p->local.isdn_device]->interface->command(&cmd);
				p->local.dialretry = 0;
				anymore = 1;
				p->local.dialstate++;
				/* Falls through */
			case 3:
				/* Setup interface, dial current phone-number, switch to next number.
				 * If list of phone-numbers is exhausted, increment
				 * retry-counter.
				 */
				cmd.driver = p->local.isdn_device;
				cmd.command = ISDN_CMD_SETL2;
				cmd.arg = p->local.isdn_channel + (p->local.l2_proto << 8);
				dev->drv[p->local.isdn_device]->interface->command(&cmd);
				cmd.driver = p->local.isdn_device;
				cmd.command = ISDN_CMD_SETL3;
				cmd.arg = p->local.isdn_channel + (p->local.l3_proto << 8);
				dev->drv[p->local.isdn_device]->interface->command(&cmd);
				cmd.driver = p->local.isdn_device;
				cmd.arg = p->local.isdn_channel;
				p->local.huptimer = 0;
				p->local.outgoing = 1;
				if (p->local.chargeint) {
					p->local.hupflags |= ISDN_HAVECHARGE;
					p->local.hupflags &= ~ISDN_WAITCHARGE;
				} else {
					p->local.hupflags |= ISDN_WAITCHARGE;
					p->local.hupflags &= ~ISDN_HAVECHARGE;
				}
				if (!strcmp(p->local.dial->num, "LEASED")) {
					p->local.dialstate = 4;
					printk(KERN_INFO "%s: Open leased line ...\n", p->local.name);
				} else {
					cmd.command = ISDN_CMD_DIAL;
					cmd.parm.setup.si1 = 7;
					cmd.parm.setup.si2 = 0;
					sprintf(cmd.parm.setup.phone, "%s", p->local.dial->num);
					sprintf(cmd.parm.setup.eazmsn, "%s",
						isdn_map_eaz2msn(p->local.msn, cmd.driver));
					i = isdn_dc2minor(p->local.isdn_device, p->local.isdn_channel);
					if (i >= 0) {
						strcpy(dev->num[i], p->local.dial->num);
						isdn_info_update();
					}
					printk(KERN_INFO "%s: dialing %d %s...\n", p->local.name,
					       p->local.dialretry, p->local.dial->num);
					/*
					 * Switch to next number or back to start if at end of list.
					 */
					if (!(p->local.dial = (isdn_net_phone *) p->local.dial->next)) {
						p->local.dial = p->local.phone[1];
						p->local.dialretry++;
					}
					p->local.dtimer = 0;
#ifdef ISDN_DEBUG_NET_DIAL
					printk(KERN_DEBUG "dial: d=%d c=%d\n", p->local.isdn_device,
					       p->local.isdn_channel);
#endif
					dev->drv[p->local.isdn_device]->interface->command(&cmd);
				}
				anymore = 1;
				p->local.dialstate =
				    (p->local.cbdelay &&
				     (p->local.flags & ISDN_NET_CBOUT)) ? 12 : 4;
				break;
			case 4:
				/* Wait for D-Channel-connect.
				 * If timeout and max retries not
				 * reached, switch back to state 3.
				 */
				if (p->local.dtimer++ > ISDN_TIMER_DTIMEOUT10)
					if (p->local.dialretry < p->local.dialmax) {
						p->local.dialstate = 3;
					} else
						isdn_net_hangup(&p->dev);
				anymore = 1;
				break;
			case 5:
				/* Got D-Channel-Connect, send B-Channel-request */
				cmd.driver = p->local.isdn_device;
				cmd.arg = p->local.isdn_channel;
				cmd.command = ISDN_CMD_ACCEPTB;
				anymore = 1;
				p->local.dtimer = 0;
				p->local.dialstate++;
				dev->drv[p->local.isdn_device]->interface->command(&cmd);
				break;
			case 6:
				/* Wait for B- or D-Channel-connect. If timeout,
				 * switch back to state 3.
				 */
#ifdef ISDN_DEBUG_NET_DIAL
				printk(KERN_DEBUG "dialtimer2: %d\n", p->local.dtimer);
#endif
				if (p->local.dtimer++ > ISDN_TIMER_DTIMEOUT10)
					p->local.dialstate = 3;
				anymore = 1;
				break;
			case 7:
				/* Got incoming Call, setup L2 and L3 protocols,
				 * then wait for D-Channel-connect
				 */
#ifdef ISDN_DEBUG_NET_DIAL
				printk(KERN_DEBUG "dialtimer4: %d\n", p->local.dtimer);
#endif
				cmd.driver = p->local.isdn_device;
				cmd.command = ISDN_CMD_SETL2;
				cmd.arg = p->local.isdn_channel + (p->local.l2_proto << 8);
				dev->drv[p->local.isdn_device]->interface->command(&cmd);
				cmd.driver = p->local.isdn_device;
				cmd.command = ISDN_CMD_SETL3;
				cmd.arg = p->local.isdn_channel + (p->local.l3_proto << 8);
				dev->drv[p->local.isdn_device]->interface->command(&cmd);
				if (p->local.dtimer++ > ISDN_TIMER_DTIMEOUT15)
					isdn_net_hangup(&p->dev);
				else {
					anymore = 1;
					p->local.dialstate++;
				}
				break;
			case 9:
				/* Got incoming D-Channel-Connect, send B-Channel-request */
				cmd.driver = p->local.isdn_device;
				cmd.arg = p->local.isdn_channel;
				cmd.command = ISDN_CMD_ACCEPTB;
				dev->drv[p->local.isdn_device]->interface->command(&cmd);
				anymore = 1;
				p->local.dtimer = 0;
				p->local.dialstate++;
				break;
			case 8:
			case 10:
				/*  Wait for B- or D-channel-connect */
#ifdef ISDN_DEBUG_NET_DIAL
				printk(KERN_DEBUG "dialtimer4: %d\n", p->local.dtimer);
#endif
				if (p->local.dtimer++ > ISDN_TIMER_DTIMEOUT10)
					isdn_net_hangup(&p->dev);
				else
					anymore = 1;
				break;
			case 11:
				/* Callback Delay */
				if (p->local.dtimer++ > p->local.cbdelay)
					p->local.dialstate = 1;
				anymore = 1;
				break;
			case 12:
				/* Remote does callback. Hangup after cbdelay, then wait for incoming
				 * call (in state 4).
				 */
				if (p->local.dtimer++ > p->local.cbdelay) {
					printk(KERN_INFO "%s: hangup waiting for callback ...\n", p->local.name);
					p->local.dtimer = 0;
					p->local.dialstate = 4;
					cmd.driver = p->local.isdn_device;
					cmd.command = ISDN_CMD_HANGUP;
					cmd.arg = p->local.isdn_channel;
					(void) dev->drv[cmd.driver]->interface->command(&cmd);
					isdn_all_eaz(p->local.isdn_device, p->local.isdn_channel);
				}
				anymore = 1;
				break;
			default:
				printk(KERN_WARNING "isdn_net: Illegal dialstate %d for device %s\n",
				       p->local.dialstate, p->local.name);
		}
		p = (isdn_net_dev *) p->next;
	}
	isdn_timer_ctrl(ISDN_TIMER_NETDIAL, anymore);
}

/*
 * Perform hangup for a net-interface.
 */
void
isdn_net_hangup(struct device *d)
{
	isdn_net_local *lp = (isdn_net_local *) d->priv;
	isdn_ctrl cmd;

	if (lp->flags & ISDN_NET_CONNECTED) {
		lp->flags &= ~ISDN_NET_CONNECTED;
		printk(KERN_INFO "isdn_net: local hangup %s\n", lp->name);
#ifdef CONFIG_ISDN_PPP
		isdn_ppp_free(lp);
#endif
		cmd.driver = lp->isdn_device;
		cmd.command = ISDN_CMD_HANGUP;
		cmd.arg = lp->isdn_channel;
		(void) dev->drv[cmd.driver]->interface->command(&cmd);
		printk(KERN_INFO "%s: Chargesum is %d\n", lp->name, lp->charge);
		isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
	}
	isdn_net_unbind_channel(lp);
}

typedef struct {
	unsigned short source;
	unsigned short dest;
} ip_ports;

static void
isdn_net_log_packet(u_char * buf, isdn_net_local * lp)
{
	u_char *p = buf;
	unsigned short proto = ETH_P_IP;
	int data_ofs;
	ip_ports *ipp;
	char addinfo[100];

	addinfo[0] = '\0';
	switch (lp->p_encap) {
		case ISDN_NET_ENCAP_IPTYP:
			proto = ntohs(*(unsigned short *) &buf[0]);
			p = &buf[2];
			break;
		case ISDN_NET_ENCAP_ETHER:
			proto = ntohs(*(unsigned short *) &buf[12]);
			p = &buf[14];
			break;
		case ISDN_NET_ENCAP_CISCOHDLC:
			proto = ntohs(*(unsigned short *) &buf[2]);
			p = &buf[4];
			break;
	}
	data_ofs = ((p[0] & 15) * 4);
	switch (proto) {
		case ETH_P_IP:
			switch (p[9]) {
				case 1:
					strcpy(addinfo, " ICMP");
					break;
				case 2:
					strcpy(addinfo, " IGMP");
					break;
				case 4:
					strcpy(addinfo, " IPIP");
					break;
				case 6:
					ipp = (ip_ports *) (&p[data_ofs]);
					sprintf(addinfo, " TCP, port: %d -> %d", ntohs(ipp->source),
						ntohs(ipp->dest));
					break;
				case 8:
					strcpy(addinfo, " EGP");
					break;
				case 12:
					strcpy(addinfo, " PUP");
					break;
				case 17:
					ipp = (ip_ports *) (&p[data_ofs]);
					sprintf(addinfo, " UDP, port: %d -> %d", ntohs(ipp->source),
						ntohs(ipp->dest));
					break;
				case 22:
					strcpy(addinfo, " IDP");
					break;
			}
			printk(KERN_INFO "OPEN: %d.%d.%d.%d -> %d.%d.%d.%d%s\n",
			       p[12], p[13], p[14], p[15],
			       p[16], p[17], p[18], p[19],
			       addinfo);
			break;
		case ETH_P_ARP:
			printk(KERN_INFO "OPEN: ARP %d.%d.%d.%d -> *.*.*.* ?%d.%d.%d.%d\n",
			       p[14], p[15], p[16], p[17],
			       p[24], p[25], p[26], p[27]);
			break;
	}
}

/*
 * Generic routine to send out an skbuf.
 * If lowlevel-device does not support supports skbufs, use
 * standard send-routine, else send directly.
 *
 * Return: 0 on success, !0 on failure.
 * Side-effects: ndev->tbusy is cleared on success.
 */
int
isdn_net_send_skb(struct device *ndev, isdn_net_local * lp,
		  struct sk_buff *skb)
{
	int ret;
	int len = skb->len;     /* save len */

	ret = isdn_writebuf_skb_stub(lp->isdn_device, lp->isdn_channel, skb);
	if (ret == len) {
		lp->transcount += len;
		clear_bit(0, (void *) &(ndev->tbusy));
		return 0;
	}
	if (ret < 0) {
		SET_SKB_FREE(skb);
		dev_kfree_skb(skb, FREE_WRITE);
		lp->stats.tx_errors++;
		clear_bit(0, (void *) &(ndev->tbusy));
		return 0;
	}
	return 1;
}


/*
 *  Helper function for isdn_net_start_xmit.
 *  When called, the connection is already established.
 *  Based on cps-calculation, check if device is overloaded.
 *  If so, and if a slave exists, trigger dialing for it.
 *  If any slave is online, deliver packets using a simple round robin
 *  scheme.
 *
 *  Return: 0 on success, !0 on failure.
 */

static int
isdn_net_xmit(struct device *ndev, isdn_net_local * lp, struct sk_buff *skb)
{
	int ret;

	/* For the other encaps the header has already been built */
#ifdef CONFIG_ISDN_PPP
	if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
		return isdn_ppp_xmit(skb, ndev);
	}
#endif
	/* Reset hangup-timeout */
	lp->huptimer = 0;
	if (lp->cps > 7000) {
		/* Device overloaded */

		/*
		 * Packet-delivery via round-robin over master
		 * and all connected slaves.
		 */
		if (lp->master)
			/* Slaves always deliver themselves */
			ret = isdn_net_send_skb(ndev, lp, skb);
		else {
			isdn_net_local *slp = (isdn_net_local *) (lp->srobin->priv);
			/* Master delivers via srobin and maintains srobin */
			if (lp->srobin == ndev)
				ret = isdn_net_send_skb(ndev, lp, skb);
			else
				ret = ndev->tbusy = isdn_net_start_xmit(skb, lp->srobin);
			lp->srobin = (slp->slave) ? slp->slave : ndev;
			slp = (isdn_net_local *) (lp->srobin->priv);
			if (!((slp->flags & ISDN_NET_CONNECTED) && (slp->dialstate == 0)))
				lp->srobin = ndev;
		}
		/* Slave-startup using delay-variable */
		if (lp->slave) {
			if (!lp->sqfull) {
				/* First time overload: set timestamp only */
				lp->sqfull = 1;
				lp->sqfull_stamp = jiffies;
			} else {
				/* subsequent overload: if slavedelay exceeded, start dialing */
				if ((jiffies - lp->sqfull_stamp) > lp->slavedelay)
					isdn_net_force_dial_lp((isdn_net_local *) lp->slave->priv);
			}
		}
	} else {
		/* Not overloaded, deliver locally */
		ret = isdn_net_send_skb(ndev, lp, skb);
		if (lp->sqfull && ((jiffies - lp->sqfull_stamp) > (lp->slavedelay + (10 * HZ))))
			lp->sqfull = 0;
	}
	return ret;
}

/*
 * Try sending a packet.
 * If this interface isn't connected to a ISDN-Channel, find a free channel,
 * and start dialing.
 */
int
isdn_net_start_xmit(struct sk_buff *skb, struct device *ndev)
{
	isdn_net_local *lp = (isdn_net_local *) ndev->priv;

	if (ndev->tbusy) {
		if (jiffies - ndev->trans_start < (2 * HZ))
			return 1;
		if (!lp->dialstate)
			lp->stats.tx_errors++;
		ndev->tbusy = 0;
		ndev->trans_start = jiffies;
	}
	if (skb == NULL) {
		dev_tint(ndev);
		return 0;
	}
	/* Avoid timer-based retransmission conflicts. */
	if (set_bit(0, (void *) &ndev->tbusy) != 0)
		printk(KERN_WARNING
		       "%s: Transmitter access conflict.\n",
		       ndev->name);
	else {
		u_char *buf = skb->data;
#ifdef ISDN_DEBUG_NET_DUMP
		isdn_dumppkt("S:", buf, skb->len, 40);
#endif
		if (!(lp->flags & ISDN_NET_CONNECTED)) {
			int chi;
			if (lp->phone[1]) {
				ulong flags;
				save_flags(flags);
				cli();
				/* Grab a free ISDN-Channel */
				if ((chi =
				     isdn_get_free_channel(ISDN_USAGE_NET,
							   lp->l2_proto,
							   lp->l3_proto,
							   lp->pre_device,
						 lp->pre_channel)) < 0) {
					printk(KERN_WARNING
					       "isdn_net_start_xmit: No channel for %s\n",
					       ndev->name);
					restore_flags(flags);
					/* we probably should drop the skb here and return 0 to omit
					   'socket destroy delayed' messages */
					return 1;
				}
				/* Log packet, which triggered dialing */
				if (dev->net_verbose)
					isdn_net_log_packet(buf, lp);
				lp->dialstate = 1;
				lp->flags |= ISDN_NET_CONNECTED;
				/* Connect interface with channel */
				isdn_net_bind_channel(lp, chi);
#ifdef CONFIG_ISDN_PPP
				if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
					/* no 'first_skb' handling for syncPPP */
					if (isdn_ppp_bind(lp) < 0) {
						dev_kfree_skb(skb, FREE_WRITE);
						isdn_net_unbind_channel(lp);
						restore_flags(flags);
						return 0;	/* STN (skb to nirvana) ;) */
					}
					restore_flags(flags);
					isdn_net_dial();	/* Initiate dialing */
					return 1;	/* let upper layer requeue skb packet */
				}
#endif
				/* remember first skb to speed up arp
				 * when using encap ETHER
				 */
				if (lp->first_skb) {
					printk(KERN_WARNING "isdn_net_start_xmit: First skb already set!\n");
					dev_kfree_skb(lp->first_skb, FREE_WRITE);
					lp->first_skb = NULL;
				}
				lp->first_skb = skb;
				/* Initiate dialing */
				ndev->tbusy = 0;
				restore_flags(flags);
				isdn_net_dial();
				return 0;
			} else {
				/*
				 * Having no phone-number is a permanent
				 * failure or misconfiguration.
				 * Instead of just dropping, we should also
				 * have the upper layers to respond
				 * with an ICMP No route to host in the
				 * future, however at the moment, i don't
				 * know a simple way to do that.
				 * The same applies, when the telecom replies
				 * "no destination" to our dialing-attempt.
				 */
				printk(KERN_WARNING
				       "isdn_net: No phone number for %s, packet dropped\n",
				       ndev->name);
				dev_kfree_skb(skb, FREE_WRITE);
				ndev->tbusy = 0;
				return 0;
			}
		} else {
			/* Connection is established, try sending */
			ndev->trans_start = jiffies;
			if (!lp->dialstate) {
				if (lp->first_skb) {
					if (isdn_net_xmit(ndev, lp, lp->first_skb))
						return 1;
					lp->first_skb = NULL;
				}
				return (isdn_net_xmit(ndev, lp, skb));
			} else
				ndev->tbusy = 1;
		}
	}
	return 1;
}

/*
 * Shutdown a net-interface.
 */
static int
isdn_net_close(struct device *dev)
{
	struct device *p;

	dev->tbusy = 1;
	dev->start = 0;
	isdn_net_hangup(dev);
	if ((p = (((isdn_net_local *) dev->priv)->slave))) {
		/* If this interface has slaves, stop them also */
		while (p) {
			isdn_net_hangup(p);
			p->tbusy = 1;
			p->start = 0;
			p = (((isdn_net_local *) p->priv)->slave);
		}
	}
	isdn_MOD_DEC_USE_COUNT();
	return 0;
}

/*
 * Get statistics
 */
static struct enet_statistics *
isdn_net_get_stats(struct device *dev)
{
	isdn_net_local *lp = (isdn_net_local *) dev->priv;
	return &lp->stats;
}

/*      This is simply a copy from std. eth.c EXCEPT we pull ETH_HLEN
 *      instead of dev->hard_header_len off. This is done because the
 *      lowlevel-driver has already pulled off its stuff when we get
 *      here and this routine only gets called with p_encap == ETHER.
 *      Determine the packet's protocol ID. The rule here is that we
 *      assume 802.3 if the type field is short enough to be a length.
 *      This is normal practice and works for any 'now in use' protocol.
 */

static unsigned short
isdn_net_type_trans(struct sk_buff *skb, struct device *dev)
{
	struct ethhdr *eth;
	unsigned char *rawp;

	skb_pull(skb, ETH_HLEN);
	eth = skb->mac.ethernet;

	if (*eth->h_dest & 1) {
		if (memcmp(eth->h_dest, dev->broadcast, ETH_ALEN) == 0)
			skb->pkt_type = PACKET_BROADCAST;
		else
			skb->pkt_type = PACKET_MULTICAST;
	}
	/*
	 *      This ALLMULTI check should be redundant by 1.4
	 *      so don't forget to remove it.
	 */

	else if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
		if (memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN))
			skb->pkt_type = PACKET_OTHERHOST;
	}
	if (ntohs(eth->h_proto) >= 1536)
		return eth->h_proto;

	rawp = skb->data;

	/*
	 *      This is a magic hack to spot IPX packets. Older Novell breaks
	 *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
	 *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
	 *      won't work for fault tolerant netware but does for the rest.
	 */
	if (*(unsigned short *) rawp == 0xFFFF)
		return htons(ETH_P_802_3);
	/*
	 *      Real 802.2 LLC
	 */
	return htons(ETH_P_802_2);
}

/*
 * Got a packet from ISDN-Channel.
 */
static void
isdn_net_receive(struct device *ndev, struct sk_buff *skb)
{
	isdn_net_local *lp = (isdn_net_local *) ndev->priv;
#ifdef CONFIG_ISDN_PPP
	isdn_net_local *olp = lp;	/* original 'lp' */
	int proto = PPP_PROTOCOL(skb->data);
#endif

	lp->transcount += skb->len;
	lp->stats.rx_packets++;
#ifdef CONFIG_ISDN_PPP
	/*
	 * If encapsulation is syncppp, don't reset
	 * huptimer on LCP packets.
	 */
	if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP ||
	    (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP && proto != PPP_LCP))
#endif
		lp->huptimer = 0;

	if (lp->master) {
		/* Bundling: If device is a slave-device, deliver to master, also
		 * handle master's statistics and hangup-timeout
		 */
		ndev = lp->master;
		lp = (isdn_net_local *) ndev->priv;
		lp->stats.rx_packets++;
#ifdef CONFIG_ISDN_PPP
		/*
		 * If encapsulation is syncppp, don't reset
		 * huptimer on LCP packets.
		 */
		if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP ||
		    (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP && proto != PPP_LCP))
#endif
			lp->huptimer = 0;
	}
	skb->dev = ndev;
	skb->pkt_type = PACKET_HOST;
	skb->mac.raw = skb->data;
#ifdef ISDN_DEBUG_NET_DUMP
	isdn_dumppkt("R:", skb->data, skb->len, 40);
#endif
	switch (lp->p_encap) {
		case ISDN_NET_ENCAP_ETHER:
			/* Ethernet over ISDN */
			skb->protocol = isdn_net_type_trans(skb, ndev);
			break;
		case ISDN_NET_ENCAP_UIHDLC:
			/* HDLC with UI-frame (for ispa with -h1 option) */
			skb_pull(skb, 2);
			/* Fall through */
		case ISDN_NET_ENCAP_RAWIP:
			/* RAW-IP without MAC-Header */
			skb->protocol = htons(ETH_P_IP);
			break;
		case ISDN_NET_ENCAP_CISCOHDLC:
			/* CISCO-HDLC IP with type field and  fake I-frame-header */
			skb_pull(skb, 2);
			/* Fall through */
		case ISDN_NET_ENCAP_IPTYP:
			/* IP with type field */
			skb->protocol = *(unsigned short *) &(skb->data[0]);
			skb_pull(skb, 2);
			if (*(unsigned short *) skb->data == 0xFFFF)
				skb->protocol = htons(ETH_P_802_3);
			break;
#ifdef CONFIG_ISDN_PPP
		case ISDN_NET_ENCAP_SYNCPPP:
			isdn_ppp_receive(lp->netdev, olp, skb);
			return;
#endif
		default:
			printk(KERN_WARNING "%s: unknown encapsulation, dropping\n",
			       lp->name);
			kfree_skb(skb, FREE_READ);
			return;
	}
	netif_rx(skb);
	return;
}

/*
 * A packet arrived via ISDN. Search interface-chain for a corresponding
 * interface. If found, deliver packet to receiver-function and return 1,
 * else return 0.
 */
int
isdn_net_rcv_skb(int idx, struct sk_buff *skb)
{
	isdn_net_dev *p = dev->rx_netdev[idx];

	if (p) {
		isdn_net_local *lp = &p->local;
		if ((lp->flags & ISDN_NET_CONNECTED) &&
		    (!lp->dialstate)) {
			isdn_net_receive(&p->dev, skb);
			return 1;
		}
	}
	return 0;
}

static int
my_eth_header(struct sk_buff *skb, struct device *dev, unsigned short type,
	      void *daddr, void *saddr, unsigned len)
{
	struct ethhdr *eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);

	/*
	 * Set the protocol type. For a packet of type ETH_P_802_3 we
	 * put the length here instead. It is up to the 802.2 layer to
	 * carry protocol information.
	 */

	if (type != ETH_P_802_3)
		eth->h_proto = htons(type);
	else
		eth->h_proto = htons(len);

	/*
	 * Set the source hardware address.
	 */
	if (saddr)
		memcpy(eth->h_source, saddr, dev->addr_len);
	else
		memcpy(eth->h_source, dev->dev_addr, dev->addr_len);

	/*
	 * Anyway, the loopback-device should never use this function...
	 */

	if (dev->flags & IFF_LOOPBACK) {
		memset(eth->h_dest, 0, dev->addr_len);
		return (dev->hard_header_len);
	}
	if (daddr) {
		memcpy(eth->h_dest, daddr, dev->addr_len);
		return dev->hard_header_len;
	}
	return -dev->hard_header_len;
}

/*
 *  build an header
 *  depends on encaps that is being used.
 */

static int
isdn_net_header(struct sk_buff *skb, struct device *dev, unsigned short type,
		void *daddr, void *saddr, unsigned plen)
{
	isdn_net_local *lp = dev->priv;
	ushort len = 0;

	switch (lp->p_encap) {
		case ISDN_NET_ENCAP_ETHER:
			len = my_eth_header(skb, dev, type, daddr, saddr, plen);
			break;
		case ISDN_NET_ENCAP_RAWIP:
			printk(KERN_WARNING "isdn_net_header called with RAW_IP!\n");
			len = 0;
			break;
		case ISDN_NET_ENCAP_IPTYP:
			/* ethernet type field */
			*((ushort *) skb_push(skb, 2)) = htons(type);
			len = 2;
			break;
		case ISDN_NET_ENCAP_UIHDLC:
			/* HDLC with UI-Frames (for ispa with -h1 option) */
			*((ushort *) skb_push(skb, 2)) = htons(0x0103);
			len = 2;
			break;
		case ISDN_NET_ENCAP_CISCOHDLC:
			skb_push(skb, 4);
			skb->data[0] = 0x0f;
			skb->data[1] = 0x00;
			*((ushort *) & skb->data[2]) = htons(type);
			len = 4;
			break;
	}
	return len;
}

/* We don't need to send arp, because we have point-to-point connections. */
#if (LINUX_VERSION_CODE < 0x02010F)
static int
isdn_net_rebuild_header(void *buff, struct device *dev, unsigned long dst,
			struct sk_buff *skb)
{
	isdn_net_local *lp = dev->priv;
	int ret = 0;

	if (lp->p_encap == ISDN_NET_ENCAP_ETHER) {
		struct ethhdr *eth = (struct ethhdr *) buff;

		/*
		 *      Only ARP/IP is currently supported
		 */

		if (eth->h_proto != htons(ETH_P_IP)) {
			printk(KERN_WARNING
			       "isdn_net: %s don't know how to resolve type %d addresses?\n",
			       dev->name, (int) eth->h_proto);
			memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
			return 0;
		}
		/*
		 *      Try to get ARP to resolve the header.
		 */
#ifdef CONFIG_INET
		ret = arp_find(eth->h_dest, dst, dev, dev->pa_addr, skb) ? 1 : 0;
#endif
	}
	return ret;
}
#else
static int
isdn_net_rebuild_header(struct sk_buff *skb)
{
	struct device *dev = skb->dev;
	isdn_net_local *lp = dev->priv;
	int ret = 0;

	if (lp->p_encap == ISDN_NET_ENCAP_ETHER) {
		struct ethhdr *eth = (struct ethhdr *) skb->data;

		/*
		 *      Only ARP/IP is currently supported
		 */

		if (eth->h_proto != htons(ETH_P_IP)) {
			printk(KERN_WARNING
			       "isdn_net: %s don't know how to resolve type %d addresses?\n",
			       dev->name, (int) eth->h_proto);
			memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
			return 0;
		}
		/*
		 *      Try to get ARP to resolve the header.
		 */
#ifdef CONFIG_INET
		ret = arp_find(eth->h_dest, skb) ? 1 : 0;
#endif
	}
	return ret;
}
#endif
/*
 * Interface-setup. (called just after registering a new interface)
 */
static int
isdn_net_init(struct device *ndev)
{
	ushort max_hlhdr_len = 0;
	isdn_net_local *lp = (isdn_net_local *) ndev->priv;
	int drvidx,
	 i;

	if (ndev == NULL) {
		printk(KERN_WARNING "isdn_net_init: dev = NULL!\n");
		return -ENODEV;
	}
	if (ndev->priv == NULL) {
		printk(KERN_WARNING "isdn_net_init: dev->priv = NULL!\n");
		return -ENODEV;
	}
	ether_setup(ndev);
#if (LINUX_VERSION_CODE < 0x02010F)
	lp->org_hcb = ndev->header_cache_bind;
#else
	lp->org_hhc = ndev->hard_header_cache;
#endif
	lp->org_hcu = ndev->header_cache_update;

	/* Setup the generic properties */

	ndev->hard_header = NULL;
#if (LINUX_VERSION_CODE < 0x02010F)
	ndev->header_cache_bind = NULL;
#else
	ndev->hard_header_cache = NULL;
#endif
	ndev->header_cache_update = NULL;
	ndev->mtu = 1500;
	ndev->flags = IFF_NOARP;
	ndev->family = AF_INET;
	ndev->type = ARPHRD_ETHER;
	ndev->addr_len = ETH_ALEN;
	ndev->pa_addr = 0;
	ndev->pa_brdaddr = 0;
	ndev->pa_mask = 0;
	ndev->pa_alen = 4;

	for (i = 0; i < ETH_ALEN; i++)
		ndev->broadcast[i] = 0xff;

	for (i = 0; i < DEV_NUMBUFFS; i++)
		skb_queue_head_init(&ndev->buffs[i]);

	/* The ISDN-specific entries in the device structure. */
	ndev->open = &isdn_net_open;
	ndev->hard_start_xmit = &isdn_net_start_xmit;

	/*
	 *  up till binding we ask the protocol layer to reserve as much
	 *  as we might need for HL layer
	 */

	for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
		if (dev->drv[drvidx])
			if (max_hlhdr_len < dev->drv[drvidx]->interface->hl_hdrlen)
				max_hlhdr_len = dev->drv[drvidx]->interface->hl_hdrlen;

	ndev->hard_header_len = ETH_HLEN + max_hlhdr_len;

	ndev->stop = &isdn_net_close;
	ndev->get_stats = &isdn_net_get_stats;
	ndev->rebuild_header = &isdn_net_rebuild_header;

#ifdef CONFIG_ISDN_PPP
	ndev->do_ioctl = isdn_ppp_dev_ioctl;
#endif
	return 0;
}

/*
 * I picked the pattern-matching-functions from an old GNU-tar version (1.10)
 * It was originally written and put to PD by rs@mirror.TMC.COM (Rich Salz)
 */

static int
isdn_net_Star(char *s, char *p)
{
	while (isdn_net_wildmat(s, p) == 0)
		if (*++s == '\0')
			return (0);
	return (1);
}

/*
 * Shell-type Pattern-matching for incoming caller-Ids
 * This function gets a string in s and checks, if it matches the pattern
 * given in p. It returns 1 on success, 0 otherwise.
 *
 * Possible Patterns:
 *
 * '?'     matches one character
 * '*'     matches zero or more characters
 * [xyz]   matches the set of characters in brackets.
 * [^xyz]  matches any single character not in the set of characters
 */

static int
isdn_net_wildmat(char *s, char *p)
{
	register int last;
	register int matched;
	register int reverse;

	for (; *p; s++, p++)
		switch (*p) {
			case '\\':
				/*
				 * Literal match with following character,
				 * fall through.
				 */
				p++;
			default:
				if (*s != *p)
					return (0);
				continue;
			case '?':
				/* Match anything. */
				if (*s == '\0')
					return (0);
				continue;
			case '*':
				/* Trailing star matches everything. */
				return (*++p ? isdn_net_Star(s, p) : 1);
			case '[':
				/* [^....] means inverse character class. */
				if ((reverse = (p[1] == '^')))
					p++;
				for (last = 0, matched = 0; *++p && (*p != ']'); last = *p)
					/* This next line requires a good C compiler. */
					if (*p == '-' ? *s <= *++p && *s >= last : *s == *p)
						matched = 1;
				if (matched == reverse)
					return (0);
				continue;
		}
	return (*s == '\0');
}

static void
isdn_net_swapbind(int drvidx)
{
	isdn_net_dev *p;

#ifdef ISDN_DEBUG_NET_ICALL
	printk(KERN_DEBUG "n_fi: swapping ch of %d\n", drvidx);
#endif
	p = dev->netdev;
	while (p) {
		if (p->local.pre_device == drvidx)
			switch (p->local.pre_channel) {
				case 0:
					p->local.pre_channel = 1;
					break;
				case 1:
					p->local.pre_channel = 0;
					break;
			}
		p = (isdn_net_dev *) p->next;
	}
}

static void
isdn_net_swap_usage(int i1, int i2)
{
	int u1 = dev->usage[i1] & ISDN_USAGE_EXCLUSIVE;
	int u2 = dev->usage[i2] & ISDN_USAGE_EXCLUSIVE;

#ifdef ISDN_DEBUG_NET_ICALL
	printk(KERN_DEBUG "n_fi: usage of %d and %d\n", i1, i2);
#endif
	dev->usage[i1] &= ~ISDN_USAGE_EXCLUSIVE;
	dev->usage[i1] |= u2;
	dev->usage[i2] &= ~ISDN_USAGE_EXCLUSIVE;
	dev->usage[i2] |= u1;
	isdn_info_update();
}

/*
 * An incoming call-request has arrived.
 * Search the interface-chain for an appropriate interface.
 * If found, connect the interface to the ISDN-channel and initiate
 * D- and B-Channel-setup. If secure-flag is set, accept only
 * configured phone-numbers. If callback-flag is set, initiate
 * callback-dialing.
 *
 * Return-Value: 0 = No appropriate interface for this call.
 *               1 = Call accepted
 *               2 = Reject call, wait cbdelay, then call back
 *               3 = Reject call
 *               4 = Wait cbdelay, then call back
 */
int
isdn_net_find_icall(int di, int ch, int idx, setup_parm setup)
{
	char *eaz;
	int si1;
	int si2;
	int ematch;
	int swapped;
	int sidx = 0;
	isdn_net_dev *p;
	isdn_net_phone *n;
	ulong flags;
	char nr[32];

	/* Search name in netdev-chain */
	save_flags(flags);
	cli();
	if (!setup.phone[0]) {
		nr[0] = '0';
		nr[1] = '\0';
		printk(KERN_INFO "isdn_net: Incoming call without OAD, assuming '0'\n");
	} else
		strcpy(nr, setup.phone);
	si1 = (int) setup.si1;
	si2 = (int) setup.si2;
	if (!setup.eazmsn[0]) {
		printk(KERN_WARNING "isdn_net: Incoming call without CPN, assuming '0'\n");
		eaz = "0";
	} else
		eaz = setup.eazmsn;
	if (dev->net_verbose > 1)
		printk(KERN_INFO "isdn_net: call from %s,%d,%d -> %s\n", nr, si1, si2, eaz);
	/* Accept only calls with Si1 = 7 (Data-Transmission) */
	if (si1 != 7) {
		if (dev->net_verbose > 1)
			printk(KERN_INFO "isdn_net: Service-Indicator not 7, ignored\n");
		return 0;
	}
	n = (isdn_net_phone *) 0;
	p = dev->netdev;
	ematch = 0;
#ifdef ISDN_DEBUG_NET_ICALL
	printk(KERN_DEBUG "n_fi: di=%d ch=%d idx=%d usg=%d\n", di, ch, idx,
	       dev->usage[idx]);
#endif
	swapped = 0;
	while (p) {
		/* If last check has triggered as binding-swap, revert it */
		switch (swapped) {
			case 2:
				isdn_net_swap_usage(idx, sidx);
				/* fall through */
			case 1:
				isdn_net_swapbind(di);
				break;
		}
		swapped = 0;
		if (!strcmp(isdn_map_eaz2msn(p->local.msn, di), eaz))
			ematch = 1;
#ifdef ISDN_DEBUG_NET_ICALL
		printk(KERN_DEBUG "n_fi: if='%s', l.msn=%s, l.flags=%d, l.dstate=%d\n",
		       p->local.name, p->local.msn, p->local.flags, p->local.dialstate);
#endif
		if ((!strcmp(isdn_map_eaz2msn(p->local.msn, di), eaz)) &&	/* EAZ is matching   */
		    (((!(p->local.flags & ISDN_NET_CONNECTED)) &&	/* but not connected */
		      (USG_NONE(dev->usage[idx]))) ||	/* and ch. unused or */
		     ((((p->local.dialstate == 4) || (p->local.dialstate == 12)) &&	/* if dialing        */
		       (!(p->local.flags & ISDN_NET_CALLBACK)))	/* but no callback   */
		     ))) {
#ifdef ISDN_DEBUG_NET_ICALL
			printk(KERN_DEBUG "n_fi: match1, pdev=%d pch=%d\n",
			       p->local.pre_device, p->local.pre_channel);
#endif
			if (dev->usage[idx] & ISDN_USAGE_EXCLUSIVE) {
				if ((p->local.pre_channel != ch) ||
				    (p->local.pre_device != di)) {
					/* Here we got a problem:
					 * If using an ICN-Card, an incoming call is always signaled on
					 * on the first channel of the card, if both channels are
					 * down. However this channel may be bound exclusive. If the
					 * second channel is free, this call should be accepted.
					 * The solution is horribly but it runs, so what:
					 * We exchange the exclusive bindings of the two channels, the
					 * corresponding variables in the interface-structs.
					 */
					if (ch == 0) {
						sidx = isdn_dc2minor(di, 1);
#ifdef ISDN_DEBUG_NET_ICALL
						printk(KERN_DEBUG "n_fi: ch is 0\n");
#endif
						if (USG_NONE(dev->usage[sidx])) {
							/* Second Channel is free, now see if it is bound
							 * exclusive too. */
							if (dev->usage[sidx] & ISDN_USAGE_EXCLUSIVE) {
#ifdef ISDN_DEBUG_NET_ICALL
								printk(KERN_DEBUG "n_fi: 2nd channel is down and bound\n");
#endif
								/* Yes, swap bindings only, if the original
								 * binding is bound to channel 1 of this driver */
								if ((p->local.pre_device == di) &&
								    (p->local.pre_channel == 1)) {
									isdn_net_swapbind(di);
									swapped = 1;
								} else {
									/* ... else iterate next device */
									p = (isdn_net_dev *) p->next;
									continue;
								}
							} else {
#ifdef ISDN_DEBUG_NET_ICALL
								printk(KERN_DEBUG "n_fi: 2nd channel is down and unbound\n");
#endif
								/* No, swap always and swap excl-usage also */
								isdn_net_swap_usage(idx, sidx);
								isdn_net_swapbind(di);
								swapped = 2;
							}
							/* Now check for exclusive binding again */
#ifdef ISDN_DEBUG_NET_ICALL
							printk(KERN_DEBUG "n_fi: final check\n");
#endif
							if ((dev->usage[idx] & ISDN_USAGE_EXCLUSIVE) &&
							    ((p->local.pre_channel != ch) ||
							     (p->local.pre_device != di))) {
#ifdef ISDN_DEBUG_NET_ICALL
								printk(KERN_DEBUG "n_fi: final check failed\n");
#endif
								p = (isdn_net_dev *) p->next;
								continue;
							}
						}
					} else {
						/* We are already on the second channel, so nothing to do */
#ifdef ISDN_DEBUG_NET_ICALL
						printk(KERN_DEBUG "n_fi: already on 2nd channel\n");
#endif
						p = (isdn_net_dev *) p->next;
						continue;
					}
				}
			}
#ifdef ISDN_DEBUG_NET_ICALL
			printk(KERN_DEBUG "n_fi: match2\n");
#endif
			n = p->local.phone[0];
			if (p->local.flags & ISDN_NET_SECURE) {
				while (n) {
					if (isdn_net_wildmat(nr, n->num))
						break;
					n = (isdn_net_phone *) n->next;
				}
			}
			if (n || (!(p->local.flags & ISDN_NET_SECURE))) {
				isdn_net_local *lp = &(p->local);
#ifdef ISDN_DEBUG_NET_ICALL
				printk(KERN_DEBUG "n_fi: match3\n");
#endif
				/* Here we got an interface matched, now see if it is up.
				 * If not, reject the call actively.
				 */
				if (!p->dev.start) {
					restore_flags(flags);
					printk(KERN_INFO "%s: incoming call, if down -> rejected\n",
					       lp->name);
					return 3;
				}
				/* Interface is up, now see if it's a slave. If so, see if
				 * it's master and parent slave is online. If not, reject the call.
				 */
				if (lp->master) {
					isdn_net_local *mlp = (isdn_net_local *) lp->master->priv;
					printk(KERN_DEBUG "ICALLslv: %s\n", lp->name);
					printk(KERN_DEBUG "master=%s\n", mlp->name);
					if (mlp->flags & ISDN_NET_CONNECTED) {
						printk(KERN_DEBUG "master online\n");
						/* Master is online, find parent-slave (master if first slave) */
						while (mlp->slave) {
							if ((isdn_net_local *) mlp->slave->priv == lp)
								break;
							mlp = (isdn_net_local *) mlp->slave->priv;
						}
					} else
						printk(KERN_DEBUG "master offline\n");
					/* Found parent, if it's offline iterate next device */
					printk(KERN_DEBUG "mlpf: %d\n", mlp->flags & ISDN_NET_CONNECTED);
					if (!(mlp->flags & ISDN_NET_CONNECTED)) {
						p = (isdn_net_dev *) p->next;
						continue;
					}
				}
				if (lp->flags & ISDN_NET_CALLBACK) {
					int chi;
					printk(KERN_DEBUG "%s: call from %s -> %s, start callback\n",
					       lp->name, nr, eaz);
					if (lp->phone[1]) {
						/* Grab a free ISDN-Channel */
						if ((chi = isdn_get_free_channel(ISDN_USAGE_NET, lp->l2_proto,
							    lp->l3_proto,
							  lp->pre_device,
						 lp->pre_channel)) < 0) {
							printk(KERN_WARNING "isdn_net_find_icall: No channel for %s\n", lp->name);
							restore_flags(flags);
							return 0;
						}
						/* Setup dialstate. */
						lp->dtimer = 0;
						lp->dialstate = 11;
						lp->flags |= ISDN_NET_CONNECTED;
						/* Connect interface with channel */
						isdn_net_bind_channel(lp, chi);
#ifdef CONFIG_ISDN_PPP
						if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
							if (isdn_ppp_bind(lp) < 0) {
								isdn_net_unbind_channel(lp);
								restore_flags(flags);
								return 0;
							}
#endif
						/* Initiate dialing by returning 2 or 4 */
						restore_flags(flags);
						return (lp->flags & ISDN_NET_CBHUP) ? 2 : 4;
					} else
						printk(KERN_WARNING "isdn_net: %s: No phone number\n", lp->name);
					restore_flags(flags);
					return 0;
				} else {
					printk(KERN_DEBUG "%s: call from %s -> %s accepted\n", lp->name, nr,
					       eaz);
					/* if this interface is dialing, it does it probably on a different
					   device, so free this device */
					if ((p->local.dialstate == 4) || (p->local.dialstate == 12)) {
#ifdef CONFIG_ISDN_PPP
						if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
							isdn_ppp_free(lp);
#endif
						isdn_free_channel(p->local.isdn_device, p->local.isdn_channel,
							 ISDN_USAGE_NET);
					}
					dev->usage[idx] &= ISDN_USAGE_EXCLUSIVE;
					dev->usage[idx] |= ISDN_USAGE_NET;
					strcpy(dev->num[idx], nr);
					isdn_info_update();
					dev->st_netdev[idx] = lp->netdev;
					p->local.isdn_device = di;
					p->local.isdn_channel = ch;
					p->local.ppp_slot = -1;
					p->local.flags |= ISDN_NET_CONNECTED;
					p->local.dialstate = 7;
					p->local.dtimer = 0;
					p->local.outgoing = 0;
					p->local.huptimer = 0;
					p->local.hupflags |= ISDN_WAITCHARGE;
					p->local.hupflags &= ~ISDN_HAVECHARGE;
#ifdef CONFIG_ISDN_PPP
					if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
						if (isdn_ppp_bind(lp) < 0) {
							isdn_net_unbind_channel(lp);
							restore_flags(flags);
							return 0;
						}
#endif
					restore_flags(flags);
					return 1;
				}
			}
		}
		p = (isdn_net_dev *) p->next;
	}
	/* If none of configured EAZ/MSN matched and not verbose, be silent */
	if (ematch || dev->net_verbose)
		printk(KERN_INFO "isdn_net: call from %s -> %d %s ignored\n", nr, di, eaz);
	restore_flags(flags);
	return 0;
}

/*
 * Search list of net-interfaces for an interface with given name.
 */
isdn_net_dev *
isdn_net_findif(char *name)
{
	isdn_net_dev *p = dev->netdev;

	while (p) {
		if (!strcmp(p->local.name, name))
			return p;
		p = (isdn_net_dev *) p->next;
	}
	return (isdn_net_dev *) NULL;
}

/*
 * Force a net-interface to dial out.
 * This is called from the userlevel-routine below or
 * from isdn_net_start_xmit().
 */
int
isdn_net_force_dial_lp(isdn_net_local * lp)
{
	if ((!(lp->flags & ISDN_NET_CONNECTED)) && !lp->dialstate) {
		int chi;
		if (lp->phone[1]) {
			ulong flags;
			save_flags(flags);
			cli();
			/* Grab a free ISDN-Channel */
			if ((chi = isdn_get_free_channel(ISDN_USAGE_NET, lp->l2_proto,
							 lp->l3_proto,
							 lp->pre_device,
						 lp->pre_channel)) < 0) {
				printk(KERN_WARNING "isdn_net_force_dial: No channel for %s\n", lp->name);
				restore_flags(flags);
				return -EAGAIN;
			}
			lp->dialstate = 1;
			lp->flags |= ISDN_NET_CONNECTED;
			/* Connect interface with channel */
			isdn_net_bind_channel(lp, chi);
#ifdef CONFIG_ISDN_PPP
			if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
				if (isdn_ppp_bind(lp) < 0) {
					isdn_net_unbind_channel(lp);
					restore_flags(flags);
					return -EAGAIN;
				}
#endif
			/* Initiate dialing */
			restore_flags(flags);
			isdn_net_dial();
			return 0;
		} else
			return -EINVAL;
	} else
		return -EBUSY;
}

/*
 * Force a net-interface to dial out.
 * This is always called from within userspace (ISDN_IOCTL_NET_DIAL).
 */
int
isdn_net_force_dial(char *name)
{
	isdn_net_dev *p = isdn_net_findif(name);

	if (!p)
		return -ENODEV;
	return (isdn_net_force_dial_lp(&p->local));
}

/*
 * Allocate a new network-interface and initialize its data structures.
 */
char *
isdn_net_new(char *name, struct device *master)
{
	isdn_net_dev *netdev;

	/* Avoid creating an existing interface */
	if (isdn_net_findif(name)) {
		printk(KERN_WARNING "isdn_net: interface %s already exists\n", name);
		return NULL;
	}
	if (!(netdev = (isdn_net_dev *) kmalloc(sizeof(isdn_net_dev), GFP_KERNEL))) {
		printk(KERN_WARNING "isdn_net: Could not allocate net-device\n");
		return NULL;
	}
	memset(netdev, 0, sizeof(isdn_net_dev));
	if (name == NULL)
		strcpy(netdev->local.name, "         ");
	else
		strcpy(netdev->local.name, name);
	netdev->dev.name = netdev->local.name;
	netdev->dev.priv = &netdev->local;
	netdev->dev.init = isdn_net_init;
	netdev->local.p_encap = ISDN_NET_ENCAP_RAWIP;
	if (master) {
		/* Device shall be a slave */
		struct device *p = (((isdn_net_local *) master->priv)->slave);
		struct device *q = master;

		netdev->local.master = master;
		/* Put device at end of slave-chain */
		while (p) {
			q = p;
			p = (((isdn_net_local *) p->priv)->slave);
		}
		((isdn_net_local *) q->priv)->slave = &(netdev->dev);
		q->interrupt = 0;
		q->tbusy = 0;
		q->start = master->start;
	} else {
		/* Device shall be a master */
		if (register_netdev(&netdev->dev) != 0) {
			printk(KERN_WARNING "isdn_net: Could not register net-device\n");
			kfree(netdev);
			return NULL;
		}
	}
	netdev->local.magic = ISDN_NET_MAGIC;

#ifdef CONFIG_ISDN_PPP
	netdev->mp_last = NULL; /* mpqueue is empty */
	netdev->ib.next_num = 0;
	netdev->ib.last = NULL;
#endif
	netdev->queue = &netdev->local;
	netdev->local.last = &netdev->local;
	netdev->local.netdev = netdev;
	netdev->local.next = &netdev->local;

	netdev->local.isdn_device = -1;
	netdev->local.isdn_channel = -1;
	netdev->local.pre_device = -1;
	netdev->local.pre_channel = -1;
	netdev->local.exclusive = -1;
	netdev->local.ppp_slot = -1;
	netdev->local.pppbind = -1;
	netdev->local.sav_skb = NULL;
	netdev->local.first_skb = NULL;
	netdev->local.l2_proto = ISDN_PROTO_L2_X75I;
	netdev->local.l3_proto = ISDN_PROTO_L3_TRANS;
	netdev->local.slavedelay = 10 * HZ;
	netdev->local.srobin = &netdev->dev;
	netdev->local.hupflags = ISDN_INHUP;	/* Do hangup even on incoming calls */
	netdev->local.onhtime = 10;	/* Default hangup-time for saving costs
	   of those who forget configuring this */
	netdev->local.dialmax = 1;
	netdev->local.flags = ISDN_NET_CBHUP;	/* Hangup before Callback */
	netdev->local.cbdelay = 25;	/* Wait 5 secs before Callback */
	/* Put into to netdev-chain */
	netdev->next = (void *) dev->netdev;
	dev->netdev = netdev;
	return netdev->dev.name;
}

char *
isdn_net_newslave(char *parm)
{
	char *p = strchr(parm, ',');
	isdn_net_dev *n;
	char newname[10];

	if (p) {
		/* Slave-Name MUST not be empty */
		if (!strlen(p + 1))
			return NULL;
		strcpy(newname, p + 1);
		*p = 0;
		/* Master must already exist */
		if (!(n = isdn_net_findif(parm)))
			return NULL;
		/* Master must be a real interface, not a slave */
		if (n->local.master)
			return NULL;
		/* Master must not be started yet */
		if (n->dev.start)
			return NULL;
		return (isdn_net_new(newname, &(n->dev)));
	}
	return NULL;
}

/*
 * Set interface-parameters.
 * Always set all parameters, so the user-level application is responsible
 * for not overwriting existing setups. It has to get the current
 * setup first, if only selected parameters are to be changed.
 */
int
isdn_net_setcfg(isdn_net_ioctl_cfg * cfg)
{
	isdn_net_dev *p = isdn_net_findif(cfg->name);
	ulong features;
	int i;
	int drvidx;
	int chidx;
	char drvid[25];

	if (p) {
		/* See if any registered driver supports the features we want */
		features = (1 << cfg->l2_proto) | (256 << cfg->l3_proto);
		for (i = 0; i < ISDN_MAX_DRIVERS; i++)
			if (dev->drv[i])
				if ((dev->drv[i]->interface->features & features) == features)
					break;
		if (i == ISDN_MAX_DRIVERS) {
			printk(KERN_WARNING "isdn_net: No driver with selected features\n");
			return -ENODEV;
		}
		if (p->local.p_encap != cfg->p_encap)
			if (p->dev.start) {
				printk(KERN_WARNING
				"%s: cannot change encap when if is up\n",
				       p->local.name);
				return -EBUSY;
			}
		if (cfg->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
#ifndef CONFIG_ISDN_PPP
			printk(KERN_WARNING "%s: SyncPPP support not configured\n",
			       p->local.name);
			return -EINVAL;
#else
			p->dev.type = ARPHRD_PPP;	/* change ARP type */
			p->dev.addr_len = 0;
#endif
		}
		if (strlen(cfg->drvid)) {
			/* A bind has been requested ... */
			char *c,
			*e;

			drvidx = -1;
			chidx = -1;
			strcpy(drvid, cfg->drvid);
			if ((c = strchr(drvid, ','))) {
				/* The channel-number is appended to the driver-Id with a comma */
				chidx = (int) simple_strtoul(c + 1, &e, 10);
				if (e == c)
					chidx = -1;
				*c = '\0';
			}
			for (i = 0; i < ISDN_MAX_DRIVERS; i++)
				/* Lookup driver-Id in array */
				if (!(strcmp(dev->drvid[i], drvid))) {
					drvidx = i;
					break;
				}
			if ((drvidx == -1) || (chidx == -1))
				/* Either driver-Id or channel-number invalid */
				return -ENODEV;
		} else {
			/* Parameters are valid, so get them */
			drvidx = p->local.pre_device;
			chidx = p->local.pre_channel;
		}
		if (cfg->exclusive > 0) {
			int flags;

			/* If binding is exclusive, try to grab the channel */
			save_flags(flags);
			if ((i = isdn_get_free_channel(ISDN_USAGE_NET, p->local.l2_proto,
						       p->local.l3_proto,
						       drvidx,
						       chidx)) < 0) {
				/* Grab failed, because desired channel is in use */
				p->local.exclusive = -1;
				restore_flags(flags);
				return -EBUSY;
			}
			/* All went ok, so update isdninfo */
			dev->usage[i] = ISDN_USAGE_EXCLUSIVE;
			isdn_info_update();
			restore_flags(flags);
			p->local.exclusive = i;
		} else {
			/* Non-exclusive binding or unbind. */
			p->local.exclusive = -1;
			if ((p->local.pre_device != -1) && (cfg->exclusive == -1)) {
				isdn_unexclusive_channel(p->local.pre_device, p->local.pre_channel);
				isdn_free_channel(p->local.pre_device, p->local.pre_channel, ISDN_USAGE_NET);
				drvidx = -1;
				chidx = -1;
			}
		}
		strcpy(p->local.msn, cfg->eaz);
		p->local.pre_device = drvidx;
		p->local.pre_channel = chidx;
		p->local.onhtime = cfg->onhtime;
		p->local.charge = cfg->charge;
		p->local.l2_proto = cfg->l2_proto;
		p->local.l3_proto = cfg->l3_proto;
		p->local.cbdelay = cfg->cbdelay;
		p->local.dialmax = cfg->dialmax;
		p->local.slavedelay = cfg->slavedelay * HZ;
		p->local.pppbind = cfg->pppbind;
		if (cfg->secure)
			p->local.flags |= ISDN_NET_SECURE;
		else
			p->local.flags &= ~ISDN_NET_SECURE;
		if (cfg->cbhup)
			p->local.flags |= ISDN_NET_CBHUP;
		else
			p->local.flags &= ~ISDN_NET_CBHUP;
		switch (cfg->callback) {
			case 0:
				p->local.flags &= ~(ISDN_NET_CALLBACK | ISDN_NET_CBOUT);
				break;
			case 1:
				p->local.flags |= ISDN_NET_CALLBACK;
				p->local.flags &= ~ISDN_NET_CBOUT;
				break;
			case 2:
				p->local.flags |= ISDN_NET_CBOUT;
				p->local.flags &= ~ISDN_NET_CALLBACK;
				break;
		}
		if (cfg->chargehup)
			p->local.hupflags |= ISDN_CHARGEHUP;
		else
			p->local.hupflags &= ~ISDN_CHARGEHUP;
		if (cfg->ihup)
			p->local.hupflags |= ISDN_INHUP;
		else
			p->local.hupflags &= ~ISDN_INHUP;
		if (cfg->chargeint > 10) {
			p->local.hupflags |= ISDN_CHARGEHUP | ISDN_HAVECHARGE | ISDN_MANCHARGE;
			p->local.chargeint = cfg->chargeint * HZ;
		}
		if (cfg->p_encap != p->local.p_encap) {
			if (cfg->p_encap == ISDN_NET_ENCAP_RAWIP) {
				p->dev.hard_header = NULL;
#if (LINUX_VERSION_CODE < 0x02010F)
				p->dev.header_cache_bind = NULL;
#else
				p->dev.hard_header_cache = NULL;
#endif
				p->dev.header_cache_update = NULL;
				p->dev.flags = IFF_NOARP;
			} else {
				p->dev.hard_header = isdn_net_header;
				if (cfg->p_encap == ISDN_NET_ENCAP_ETHER) {
#if (LINUX_VERSION_CODE < 0x02010F)
					p->dev.header_cache_bind = p->local.org_hcb;
#else
					p->dev.hard_header_cache = p->local.org_hhc;
#endif
					p->dev.header_cache_update = p->local.org_hcu;
					p->dev.flags = IFF_BROADCAST | IFF_MULTICAST;
				} else {
#if (LINUX_VERSION_CODE < 0x02010F)
					p->dev.header_cache_bind = NULL;
#else
					p->dev.hard_header_cache = NULL;
#endif
					p->dev.header_cache_update = NULL;
					p->dev.flags = IFF_NOARP;
				}
			}
		}
		p->local.p_encap = cfg->p_encap;
		return 0;
	}
	return -ENODEV;
}

/*
 * Perform get-interface-parameters.ioctl
 */
int
isdn_net_getcfg(isdn_net_ioctl_cfg * cfg)
{
	isdn_net_dev *p = isdn_net_findif(cfg->name);

	if (p) {
		strcpy(cfg->eaz, p->local.msn);
		cfg->exclusive = p->local.exclusive;
		if (p->local.pre_device >= 0) {
			sprintf(cfg->drvid, "%s,%d", dev->drvid[p->local.pre_device],
				p->local.pre_channel);
		} else
			cfg->drvid[0] = '\0';
		cfg->onhtime = p->local.onhtime;
		cfg->charge = p->local.charge;
		cfg->l2_proto = p->local.l2_proto;
		cfg->l3_proto = p->local.l3_proto;
		cfg->p_encap = p->local.p_encap;
		cfg->secure = (p->local.flags & ISDN_NET_SECURE) ? 1 : 0;
		cfg->callback = 0;
		if (p->local.flags & ISDN_NET_CALLBACK)
			cfg->callback = 1;
		if (p->local.flags & ISDN_NET_CBOUT)
			cfg->callback = 2;
		cfg->cbhup = (p->local.flags & ISDN_NET_CBHUP) ? 1 : 0;
		cfg->chargehup = (p->local.hupflags & 4) ? 1 : 0;
		cfg->ihup = (p->local.hupflags & 8) ? 1 : 0;
		cfg->cbdelay = p->local.cbdelay;
		cfg->dialmax = p->local.dialmax;
		cfg->slavedelay = p->local.slavedelay / HZ;
		cfg->chargeint = (p->local.hupflags & ISDN_CHARGEHUP) ?
		    (p->local.chargeint / HZ) : 0;
		cfg->pppbind = p->local.pppbind;
		if (p->local.slave)
			strcpy(cfg->slave, ((isdn_net_local *) p->local.slave->priv)->name);
		else
			cfg->slave[0] = '\0';
		if (p->local.master)
			strcpy(cfg->master, ((isdn_net_local *) p->local.master->priv)->name);
		else
			cfg->master[0] = '\0';
		return 0;
	}
	return -ENODEV;
}

/*
 * Add a phone-number to an interface.
 */
int
isdn_net_addphone(isdn_net_ioctl_phone * phone)
{
	isdn_net_dev *p = isdn_net_findif(phone->name);
	isdn_net_phone *n;

	if (isdn_net_checkwild(phone->phone) && (phone->outgoing & 1))
		return -EINVAL;
	if (p) {
		if (!(n = (isdn_net_phone *) kmalloc(sizeof(isdn_net_phone), GFP_KERNEL)))
			return -ENOMEM;
		strcpy(n->num, phone->phone);
		n->next = p->local.phone[phone->outgoing & 1];
		p->local.phone[phone->outgoing & 1] = n;
		return 0;
	}
	return -ENODEV;
}

/*
 * Return a string of all phone-numbers of an interface.
 */
int
isdn_net_getphones(isdn_net_ioctl_phone * phone, char *phones)
{
	isdn_net_dev *p = isdn_net_findif(phone->name);
	int inout = phone->outgoing & 1;
	int more = 0;
	int count = 0;
	isdn_net_phone *n;
	int flags;
	int ret;

	if (!p)
		return -ENODEV;
	save_flags(flags);
	cli();
	inout &= 1;
	for (n = p->local.phone[inout]; n; n = n->next) {
		if (more) {
			put_user(' ', phones++);
			count++;
		}
		if ((ret = verify_area(VERIFY_WRITE, (void *) phones, strlen(n->num) + 1))) {
			restore_flags(flags);
			return ret;
		}
		copy_to_user(phones, n->num, strlen(n->num) + 1);
		phones += strlen(n->num);
		count += strlen(n->num);
		more = 1;
	}
	put_user(0, phones);
	count++;
	restore_flags(flags);
	return count;
}

/*
 * Delete a phone-number from an interface.
 */

int
isdn_net_delphone(isdn_net_ioctl_phone * phone)
{
	isdn_net_dev *p = isdn_net_findif(phone->name);
	int inout = phone->outgoing & 1;
	isdn_net_phone *n;
	isdn_net_phone *m;

	if (p) {
		n = p->local.phone[inout];
		m = NULL;
		while (n) {
			if (!strcmp(n->num, phone->phone)) {
				if (m)
					m->next = n->next;
				else
					p->local.phone[inout] = n->next;
				kfree(n);
				return 0;
			}
			m = n;
			n = (isdn_net_phone *) n->next;
		}
		return -EINVAL;
	}
	return -ENODEV;
}

/*
 * Delete all phone-numbers of an interface.
 */
static int
isdn_net_rmallphone(isdn_net_dev * p)
{
	isdn_net_phone *n;
	isdn_net_phone *m;
	int flags;
	int i;

	save_flags(flags);
	cli();
	for (i = 0; i < 2; i++) {
		n = p->local.phone[i];
		while (n) {
			m = n->next;
			kfree(n);
			n = m;
		}
		p->local.phone[i] = NULL;
	}
	restore_flags(flags);
	return 0;
}

/*
 * Force a hangup of a network-interface.
 */
int
isdn_net_force_hangup(char *name)
{
	isdn_net_dev *p = isdn_net_findif(name);
	struct device *q;

	if (p) {
		if (p->local.isdn_device < 0)
			return 1;
		isdn_net_hangup(&p->dev);
		q = p->local.slave;
		/* If this interface has slaves, do a hangup for them also. */
		while (q) {
			isdn_net_hangup(q);
			q = (((isdn_net_local *) q->priv)->slave);
		}
		return 0;
	}
	return -ENODEV;
}

/*
 * Helper-function for isdn_net_rm: Do the real work.
 */
static int
isdn_net_realrm(isdn_net_dev * p, isdn_net_dev * q)
{
	int flags;

	save_flags(flags);
	cli();
	if (p->local.master) {
		/* If it's a slave, it may be removed even if it is busy. However
		 * it has to be hung up first.
		 */
		isdn_net_hangup(&p->dev);
		p->dev.start = 0;
	}
	if (p->dev.start) {
		restore_flags(flags);
		return -EBUSY;
	}
	/* Free all phone-entries */
	isdn_net_rmallphone(p);
	/* If interface is bound exclusive, free channel-usage */
	if (p->local.exclusive != -1)
		isdn_unexclusive_channel(p->local.pre_device, p->local.pre_channel);
	if (p->local.master) {
		/* It's a slave-device, so update master's slave-pointer if necessary */
		if (((isdn_net_local *) (p->local.master->priv))->slave == &p->dev)
			((isdn_net_local *) (p->local.master->priv))->slave = p->local.slave;
	} else
		/* Unregister only if it's a master-device */
		unregister_netdev(&p->dev);
	/* Unlink device from chain */
	if (q)
		q->next = p->next;
	else
		dev->netdev = p->next;
	if (p->local.slave) {
		/* If this interface has a slave, remove it also */
		char *slavename = ((isdn_net_local *) (p->local.slave->priv))->name;
		isdn_net_dev *n = dev->netdev;
		q = NULL;
		while (n) {
			if (!strcmp(n->local.name, slavename)) {
				isdn_net_realrm(n, q);
				break;
			}
			q = n;
			n = (isdn_net_dev *) n->next;
		}
	}
	/* If no more net-devices remain, disable auto-hangup timer */
	if (dev->netdev == NULL)
		isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 0);
	restore_flags(flags);

	kfree(p);

	return 0;
}

/*
 * Remove a single network-interface.
 */
int
isdn_net_rm(char *name)
{
	isdn_net_dev *p;
	isdn_net_dev *q;

	/* Search name in netdev-chain */
	p = dev->netdev;
	q = NULL;
	while (p) {
		if (!strcmp(p->local.name, name))
			return (isdn_net_realrm(p, q));
		q = p;
		p = (isdn_net_dev *) p->next;
	}
	/* If no more net-devices remain, disable auto-hangup timer */
	if (dev->netdev == NULL)
		isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 0);
	return -ENODEV;
}

/*
 * Remove all network-interfaces
 */
int
isdn_net_rmall(void)
{
	int flags;
	int ret;

	/* Walk through netdev-chain */
	save_flags(flags);
	cli();
	while (dev->netdev) {
		if (!dev->netdev->local.master) {
			/* Remove master-devices only, slaves get removed with their master */
			if ((ret = isdn_net_realrm(dev->netdev, NULL))) {
				restore_flags(flags);
				return ret;
			}
		}
	}
	dev->netdev = NULL;
	restore_flags(flags);
	return 0;
}

/*
 * helper function to flush device queues
 * the better place would be net/core/dev.c
 */
static void
dev_purge_queues(struct device *dev)
{
	int i;
	for (i = 0; i < DEV_NUMBUFFS; i++) {
		struct sk_buff *skb;
		while ((skb = skb_dequeue(&dev->buffs[i])))
			dev_kfree_skb(skb, FREE_WRITE);
	}

}
