Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / drivers / isdn / i4l / isdn_net.c
1 /* $Id: isdn_net.c,v 1.1.2.2 2004/01/12 22:37:19 keil Exp $
2  *
3  * Linux ISDN subsystem, network interfaces and related functions (linklevel).
4  *
5  * Copyright 1994-1998  by Fritz Elfert (fritz@isdn4linux.de)
6  * Copyright 1995,96    by Thinking Objects Software GmbH Wuerzburg
7  * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
8  *
9  * This software may be used and distributed according to the terms
10  * of the GNU General Public License, incorporated herein by reference.
11  *
12  * Data Over Voice (DOV) support added - Guy Ellis 23-Mar-02 
13  *                                       guy@traverse.com.au
14  * Outgoing calls - looks for a 'V' in first char of dialed number
15  * Incoming calls - checks first character of eaz as follows:
16  *   Numeric - accept DATA only - original functionality
17  *   'V'     - accept VOICE (DOV) only
18  *   'B'     - accept BOTH DATA and DOV types
19  *
20  * Jan 2001: fix CISCO HDLC      Bjoern A. Zeeb <i4l@zabbadoz.net>
21  *           for info on the protocol, see 
22  *           http://i4l.zabbadoz.net/i4l/cisco-hdlc.txt
23  */
24
25 #include <linux/isdn.h>
26 #include <net/arp.h>
27 #include <net/dst.h>
28 #include <net/pkt_sched.h>
29 #include <linux/inetdevice.h>
30 #include "isdn_common.h"
31 #include "isdn_net.h"
32 #ifdef CONFIG_ISDN_PPP
33 #include "isdn_ppp.h"
34 #endif
35 #ifdef CONFIG_ISDN_X25
36 #include <linux/concap.h>
37 #include "isdn_concap.h"
38 #endif
39
40
41 /*
42  * Outline of new tbusy handling: 
43  *
44  * Old method, roughly spoken, consisted of setting tbusy when entering
45  * isdn_net_start_xmit() and at several other locations and clearing
46  * it from isdn_net_start_xmit() thread when sending was successful.
47  *
48  * With 2.3.x multithreaded network core, to prevent problems, tbusy should
49  * only be set by the isdn_net_start_xmit() thread and only when a tx-busy
50  * condition is detected. Other threads (in particular isdn_net_stat_callb())
51  * are only allowed to clear tbusy.
52  *
53  * -HE
54  */
55
56 /*
57  * About SOFTNET:
58  * Most of the changes were pretty obvious and basically done by HE already.
59  *
60  * One problem of the isdn net device code is that is uses struct net_device
61  * for masters and slaves. However, only master interface are registered to 
62  * the network layer, and therefore, it only makes sense to call netif_* 
63  * functions on them.
64  *
65  * --KG
66  */
67
68 /* 
69  * Find out if the netdevice has been ifup-ed yet.
70  * For slaves, look at the corresponding master.
71  */
72 static __inline__ int isdn_net_device_started(isdn_net_dev *n)
73 {
74         isdn_net_local *lp = n->local;
75         struct net_device *dev;
76         
77         if (lp->master) 
78                 dev = lp->master;
79         else
80                 dev = n->dev;
81         return netif_running(dev);
82 }
83
84 /*
85  * wake up the network -> net_device queue.
86  * For slaves, wake the corresponding master interface.
87  */
88 static __inline__ void isdn_net_device_wake_queue(isdn_net_local *lp)
89 {
90         if (lp->master) 
91                 netif_wake_queue(lp->master);
92         else
93                 netif_wake_queue(lp->netdev->dev);
94 }
95
96 /*
97  * stop the network -> net_device queue.
98  * For slaves, stop the corresponding master interface.
99  */
100 static __inline__ void isdn_net_device_stop_queue(isdn_net_local *lp)
101 {
102         if (lp->master)
103                 netif_stop_queue(lp->master);
104         else
105                 netif_stop_queue(lp->netdev->dev);
106 }
107
108 /*
109  * find out if the net_device which this lp belongs to (lp can be
110  * master or slave) is busy. It's busy iff all (master and slave) 
111  * queues are busy
112  */
113 static __inline__ int isdn_net_device_busy(isdn_net_local *lp)
114 {
115         isdn_net_local *nlp;
116         isdn_net_dev *nd;
117         unsigned long flags;
118
119         if (!isdn_net_lp_busy(lp))
120                 return 0;
121
122         if (lp->master)
123                 nd = ISDN_MASTER_PRIV(lp)->netdev;
124         else
125                 nd = lp->netdev;
126         
127         spin_lock_irqsave(&nd->queue_lock, flags);
128         nlp = lp->next;
129         while (nlp != lp) {
130                 if (!isdn_net_lp_busy(nlp)) {
131                         spin_unlock_irqrestore(&nd->queue_lock, flags);
132                         return 0;
133                 }
134                 nlp = nlp->next;
135         }
136         spin_unlock_irqrestore(&nd->queue_lock, flags);
137         return 1;
138 }
139
140 static __inline__ void isdn_net_inc_frame_cnt(isdn_net_local *lp)
141 {
142         atomic_inc(&lp->frame_cnt);
143         if (isdn_net_device_busy(lp))
144                 isdn_net_device_stop_queue(lp);
145 }
146
147 static __inline__ void isdn_net_dec_frame_cnt(isdn_net_local *lp)
148 {
149         atomic_dec(&lp->frame_cnt);
150
151         if (!(isdn_net_device_busy(lp))) {
152                 if (!skb_queue_empty(&lp->super_tx_queue)) {
153                         schedule_work(&lp->tqueue);
154                 } else {
155                         isdn_net_device_wake_queue(lp);
156                 }
157        }                                                                      
158 }
159
160 static __inline__ void isdn_net_zero_frame_cnt(isdn_net_local *lp)
161 {
162         atomic_set(&lp->frame_cnt, 0);
163 }
164
165 /* For 2.2.x we leave the transmitter busy timeout at 2 secs, just 
166  * to be safe.
167  * For 2.3.x we push it up to 20 secs, because call establishment
168  * (in particular callback) may take such a long time, and we 
169  * don't want confusing messages in the log. However, there is a slight
170  * possibility that this large timeout will break other things like MPPP,
171  * which might rely on the tx timeout. If so, we'll find out this way...
172  */
173
174 #define ISDN_NET_TX_TIMEOUT (20*HZ) 
175
176 /* Prototypes */
177
178 static int isdn_net_force_dial_lp(isdn_net_local *);
179 static int isdn_net_start_xmit(struct sk_buff *, struct net_device *);
180
181 static void isdn_net_ciscohdlck_connected(isdn_net_local *lp);
182 static void isdn_net_ciscohdlck_disconnected(isdn_net_local *lp);
183
184 char *isdn_net_revision = "$Revision: 1.1.2.2 $";
185
186  /*
187   * Code for raw-networking over ISDN
188   */
189
190 static void
191 isdn_net_unreachable(struct net_device *dev, struct sk_buff *skb, char *reason)
192 {
193         if(skb) {
194
195                 u_short proto = ntohs(skb->protocol);
196
197                 printk(KERN_DEBUG "isdn_net: %s: %s, signalling dst_link_failure %s\n",
198                        dev->name,
199                        (reason != NULL) ? reason : "unknown",
200                        (proto != ETH_P_IP) ? "Protocol != ETH_P_IP" : "");
201                 
202                 dst_link_failure(skb);
203         }
204         else {  /* dial not triggered by rawIP packet */
205                 printk(KERN_DEBUG "isdn_net: %s: %s\n",
206                            dev->name,
207                            (reason != NULL) ? reason : "reason unknown");
208         }
209 }
210
211 static void
212 isdn_net_reset(struct net_device *dev)
213 {
214 #ifdef CONFIG_ISDN_X25
215         struct concap_device_ops * dops =
216                 ((isdn_net_local *) netdev_priv(dev))->dops;
217         struct concap_proto * cprot =
218                 ((isdn_net_local *) netdev_priv(dev))->netdev->cprot;
219 #endif
220 #ifdef CONFIG_ISDN_X25
221         if( cprot && cprot -> pops && dops )
222                 cprot -> pops -> restart ( cprot, dev, dops );
223 #endif
224 }
225
226 /* Open/initialize the board. */
227 static int
228 isdn_net_open(struct net_device *dev)
229 {
230         int i;
231         struct net_device *p;
232         struct in_device *in_dev;
233
234         /* moved here from isdn_net_reset, because only the master has an
235            interface associated which is supposed to be started. BTW:
236            we need to call netif_start_queue, not netif_wake_queue here */
237         netif_start_queue(dev);
238
239         isdn_net_reset(dev);
240         /* Fill in the MAC-level header (not needed, but for compatibility... */
241         for (i = 0; i < ETH_ALEN - sizeof(u32); i++)
242                 dev->dev_addr[i] = 0xfc;
243         if ((in_dev = dev->ip_ptr) != NULL) {
244                 /*
245                  *      Any address will do - we take the first
246                  */
247                 struct in_ifaddr *ifa = in_dev->ifa_list;
248                 if (ifa != NULL)
249                         memcpy(dev->dev_addr+2, &ifa->ifa_local, 4);
250         }
251
252         /* If this interface has slaves, start them also */
253         p = MASTER_TO_SLAVE(dev);
254         if (p) {
255                 while (p) {
256                         isdn_net_reset(p);
257                         p = MASTER_TO_SLAVE(p);
258                 }
259         }
260         isdn_lock_drivers();
261         return 0;
262 }
263
264 /*
265  * Assign an ISDN-channel to a net-interface
266  */
267 static void
268 isdn_net_bind_channel(isdn_net_local * lp, int idx)
269 {
270         lp->flags |= ISDN_NET_CONNECTED;
271         lp->isdn_device = dev->drvmap[idx];
272         lp->isdn_channel = dev->chanmap[idx];
273         dev->rx_netdev[idx] = lp->netdev;
274         dev->st_netdev[idx] = lp->netdev;
275 }
276
277 /*
278  * unbind a net-interface (resets interface after an error)
279  */
280 static void
281 isdn_net_unbind_channel(isdn_net_local * lp)
282 {
283         skb_queue_purge(&lp->super_tx_queue);
284
285         if (!lp->master) {      /* reset only master device */
286                 /* Moral equivalent of dev_purge_queues():
287                    BEWARE! This chunk of code cannot be called from hardware
288                    interrupt handler. I hope it is true. --ANK
289                  */
290                 qdisc_reset_all_tx(lp->netdev->dev);
291         }
292         lp->dialstate = 0;
293         dev->rx_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
294         dev->st_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
295         isdn_free_channel(lp->isdn_device, lp->isdn_channel, ISDN_USAGE_NET);
296         lp->flags &= ~ISDN_NET_CONNECTED;
297         lp->isdn_device = -1;
298         lp->isdn_channel = -1;
299 }
300
301 /*
302  * Perform auto-hangup and cps-calculation for net-interfaces.
303  *
304  * auto-hangup:
305  * Increment idle-counter (this counter is reset on any incoming or
306  * outgoing packet), if counter exceeds configured limit either do a
307  * hangup immediately or - if configured - wait until just before the next
308  * charge-info.
309  *
310  * cps-calculation (needed for dynamic channel-bundling):
311  * Since this function is called every second, simply reset the
312  * byte-counter of the interface after copying it to the cps-variable.
313  */
314 static unsigned long last_jiffies = -HZ;
315
316 void
317 isdn_net_autohup(void)
318 {
319         isdn_net_dev *p = dev->netdev;
320         int anymore;
321
322         anymore = 0;
323         while (p) {
324                 isdn_net_local *l = p->local;
325                 if (jiffies == last_jiffies)
326                         l->cps = l->transcount;
327                 else
328                         l->cps = (l->transcount * HZ) / (jiffies - last_jiffies);
329                 l->transcount = 0;
330                 if (dev->net_verbose > 3)
331                         printk(KERN_DEBUG "%s: %d bogocps\n", p->dev->name, l->cps);
332                 if ((l->flags & ISDN_NET_CONNECTED) && (!l->dialstate)) {
333                         anymore = 1;
334                         l->huptimer++;
335                         /*
336                          * if there is some dialmode where timeout-hangup
337                          * should _not_ be done, check for that here
338                          */
339                         if ((l->onhtime) &&
340                             (l->huptimer > l->onhtime))
341                         {
342                                 if (l->hupflags & ISDN_MANCHARGE &&
343                                     l->hupflags & ISDN_CHARGEHUP) {
344                                         while (time_after(jiffies, l->chargetime + l->chargeint))
345                                                 l->chargetime += l->chargeint;
346                                         if (time_after(jiffies, l->chargetime + l->chargeint - 2 * HZ))
347                                                 if (l->outgoing || l->hupflags & ISDN_INHUP)
348                                                         isdn_net_hangup(p->dev);
349                                 } else if (l->outgoing) {
350                                         if (l->hupflags & ISDN_CHARGEHUP) {
351                                                 if (l->hupflags & ISDN_WAITCHARGE) {
352                                                         printk(KERN_DEBUG "isdn_net: Hupflags of %s are %X\n",
353                                                                p->dev->name, l->hupflags);
354                                                         isdn_net_hangup(p->dev);
355                                                 } else if (time_after(jiffies, l->chargetime + l->chargeint)) {
356                                                         printk(KERN_DEBUG
357                                                                "isdn_net: %s: chtime = %lu, chint = %d\n",
358                                                                p->dev->name, l->chargetime, l->chargeint);
359                                                         isdn_net_hangup(p->dev);
360                                                 }
361                                         } else
362                                                 isdn_net_hangup(p->dev);
363                                 } else if (l->hupflags & ISDN_INHUP)
364                                         isdn_net_hangup(p->dev);
365                         }
366
367                         if(dev->global_flags & ISDN_GLOBAL_STOPPED || (ISDN_NET_DIALMODE(*l) == ISDN_NET_DM_OFF)) {
368                                 isdn_net_hangup(p->dev);
369                                 break;
370                         }
371                 }
372                 p = (isdn_net_dev *) p->next;
373         }
374         last_jiffies = jiffies;
375         isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, anymore);
376 }
377
378 static void isdn_net_lp_disconnected(isdn_net_local *lp)
379 {
380         isdn_net_rm_from_bundle(lp);
381 }
382
383 /*
384  * Handle status-messages from ISDN-interfacecard.
385  * This function is called from within the main-status-dispatcher
386  * isdn_status_callback, which itself is called from the low-level driver.
387  * Return: 1 = Event handled, 0 = not for us or unknown Event.
388  */
389 int
390 isdn_net_stat_callback(int idx, isdn_ctrl *c)
391 {
392         isdn_net_dev *p = dev->st_netdev[idx];
393         int cmd = c->command;
394
395         if (p) {
396                 isdn_net_local *lp = p->local;
397 #ifdef CONFIG_ISDN_X25
398                 struct concap_proto *cprot = lp->netdev->cprot;
399                 struct concap_proto_ops *pops = cprot ? cprot->pops : NULL;
400 #endif
401                 switch (cmd) {
402                         case ISDN_STAT_BSENT:
403                                 /* A packet has successfully been sent out */
404                                 if ((lp->flags & ISDN_NET_CONNECTED) &&
405                                     (!lp->dialstate)) {
406                                         isdn_net_dec_frame_cnt(lp);
407                                         lp->stats.tx_packets++;
408                                         lp->stats.tx_bytes += c->parm.length;
409                                 }
410                                 return 1;
411                         case ISDN_STAT_DCONN:
412                                 /* D-Channel is up */
413                                 switch (lp->dialstate) {
414                                         case 4:
415                                         case 7:
416                                         case 8:
417                                                 lp->dialstate++;
418                                                 return 1;
419                                         case 12:
420                                                 lp->dialstate = 5;
421                                                 return 1;
422                                 }
423                                 break;
424                         case ISDN_STAT_DHUP:
425                                 /* Either D-Channel-hangup or error during dialout */
426 #ifdef CONFIG_ISDN_X25
427                                 /* If we are not connencted then dialing had
428                                    failed. If there are generic encap protocol
429                                    receiver routines signal the closure of
430                                    the link*/
431
432                                 if( !(lp->flags & ISDN_NET_CONNECTED)
433                                     && pops && pops -> disconn_ind )
434                                         pops -> disconn_ind(cprot);
435 #endif /* CONFIG_ISDN_X25 */
436                                 if ((!lp->dialstate) && (lp->flags & ISDN_NET_CONNECTED)) {
437                                         if (lp->p_encap == ISDN_NET_ENCAP_CISCOHDLCK)
438                                                 isdn_net_ciscohdlck_disconnected(lp);
439 #ifdef CONFIG_ISDN_PPP
440                                         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
441                                                 isdn_ppp_free(lp);
442 #endif
443                                         isdn_net_lp_disconnected(lp);
444                                         isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
445                                         printk(KERN_INFO "%s: remote hangup\n", p->dev->name);
446                                         printk(KERN_INFO "%s: Chargesum is %d\n", p->dev->name,
447                                                lp->charge);
448                                         isdn_net_unbind_channel(lp);
449                                         return 1;
450                                 }
451                                 break;
452 #ifdef CONFIG_ISDN_X25
453                         case ISDN_STAT_BHUP:
454                                 /* B-Channel-hangup */
455                                 /* try if there are generic encap protocol
456                                    receiver routines and signal the closure of
457                                    the link */
458                                 if( pops  &&  pops -> disconn_ind ){
459                                                 pops -> disconn_ind(cprot);
460                                                 return 1;
461                                         }
462                                 break;
463 #endif /* CONFIG_ISDN_X25 */
464                         case ISDN_STAT_BCONN:
465                                 /* B-Channel is up */
466                                 isdn_net_zero_frame_cnt(lp);
467                                 switch (lp->dialstate) {
468                                         case 5:
469                                         case 6:
470                                         case 7:
471                                         case 8:
472                                         case 9:
473                                         case 10:
474                                         case 12:
475                                                 if (lp->dialstate <= 6) {
476                                                         dev->usage[idx] |= ISDN_USAGE_OUTGOING;
477                                                         isdn_info_update();
478                                                 } else
479                                                         dev->rx_netdev[idx] = p;
480                                                 lp->dialstate = 0;
481                                                 isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 1);
482                                                 if (lp->p_encap == ISDN_NET_ENCAP_CISCOHDLCK)
483                                                         isdn_net_ciscohdlck_connected(lp);
484                                                 if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP) {
485                                                         if (lp->master) { /* is lp a slave? */
486                                                                 isdn_net_dev *nd = ISDN_MASTER_PRIV(lp)->netdev;
487                                                                 isdn_net_add_to_bundle(nd, lp);
488                                                         }
489                                                 }
490                                                 printk(KERN_INFO "isdn_net: %s connected\n", p->dev->name);
491                                                 /* If first Chargeinfo comes before B-Channel connect,
492                                                  * we correct the timestamp here.
493                                                  */
494                                                 lp->chargetime = jiffies;
495
496                                                 /* reset dial-timeout */
497                                                 lp->dialstarted = 0;
498                                                 lp->dialwait_timer = 0;
499
500 #ifdef CONFIG_ISDN_PPP
501                                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
502                                                         isdn_ppp_wakeup_daemon(lp);
503 #endif
504 #ifdef CONFIG_ISDN_X25
505                                                 /* try if there are generic concap receiver routines */
506                                                 if( pops )
507                                                         if( pops->connect_ind)
508                                                                 pops->connect_ind(cprot);
509 #endif /* CONFIG_ISDN_X25 */
510                                                 /* ppp needs to do negotiations first */
511                                                 if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP)
512                                                         isdn_net_device_wake_queue(lp);
513                                                 return 1;
514                                 }
515                                 break;
516                         case ISDN_STAT_NODCH:
517                                 /* No D-Channel avail. */
518                                 if (lp->dialstate == 4) {
519                                         lp->dialstate--;
520                                         return 1;
521                                 }
522                                 break;
523                         case ISDN_STAT_CINF:
524                                 /* Charge-info from TelCo. Calculate interval between
525                                  * charge-infos and set timestamp for last info for
526                                  * usage by isdn_net_autohup()
527                                  */
528                                 lp->charge++;
529                                 if (lp->hupflags & ISDN_HAVECHARGE) {
530                                         lp->hupflags &= ~ISDN_WAITCHARGE;
531                                         lp->chargeint = jiffies - lp->chargetime - (2 * HZ);
532                                 }
533                                 if (lp->hupflags & ISDN_WAITCHARGE)
534                                         lp->hupflags |= ISDN_HAVECHARGE;
535                                 lp->chargetime = jiffies;
536                                 printk(KERN_DEBUG "isdn_net: Got CINF chargetime of %s now %lu\n",
537                                        p->dev->name, lp->chargetime);
538                                 return 1;
539                 }
540         }
541         return 0;
542 }
543
544 /*
545  * Perform dialout for net-interfaces and timeout-handling for
546  * D-Channel-up and B-Channel-up Messages.
547  * This function is initially called from within isdn_net_start_xmit() or
548  * or isdn_net_find_icall() after initializing the dialstate for an
549  * interface. If further calls are needed, the function schedules itself
550  * for a timer-callback via isdn_timer_function().
551  * The dialstate is also affected by incoming status-messages from
552  * the ISDN-Channel which are handled in isdn_net_stat_callback() above.
553  */
554 void
555 isdn_net_dial(void)
556 {
557         isdn_net_dev *p = dev->netdev;
558         int anymore = 0;
559         int i;
560         isdn_ctrl cmd;
561         u_char *phone_number;
562
563         while (p) {
564                 isdn_net_local *lp = p->local;
565
566 #ifdef ISDN_DEBUG_NET_DIAL
567                 if (lp->dialstate)
568                         printk(KERN_DEBUG "%s: dialstate=%d\n", p->dev->name, lp->dialstate);
569 #endif
570                 switch (lp->dialstate) {
571                         case 0:
572                                 /* Nothing to do for this interface */
573                                 break;
574                         case 1:
575                                 /* Initiate dialout. Set phone-number-pointer to first number
576                                  * of interface.
577                                  */
578                                 lp->dial = lp->phone[1];
579                                 if (!lp->dial) {
580                                         printk(KERN_WARNING "%s: phone number deleted?\n",
581                                                p->dev->name);
582                                         isdn_net_hangup(p->dev);
583                                         break;
584                                 }
585                                 anymore = 1;
586
587                                 if(lp->dialtimeout > 0)
588                                         if(lp->dialstarted == 0 || time_after(jiffies, lp->dialstarted + lp->dialtimeout + lp->dialwait)) {
589                                                 lp->dialstarted = jiffies;
590                                                 lp->dialwait_timer = 0;
591                                         }
592
593                                 lp->dialstate++;
594                                 /* Fall through */
595                         case 2:
596                                 /* Prepare dialing. Clear EAZ, then set EAZ. */
597                                 cmd.driver = lp->isdn_device;
598                                 cmd.arg = lp->isdn_channel;
599                                 cmd.command = ISDN_CMD_CLREAZ;
600                                 isdn_command(&cmd);
601                                 sprintf(cmd.parm.num, "%s", isdn_map_eaz2msn(lp->msn, cmd.driver));
602                                 cmd.command = ISDN_CMD_SETEAZ;
603                                 isdn_command(&cmd);
604                                 lp->dialretry = 0;
605                                 anymore = 1;
606                                 lp->dialstate++;
607                                 /* Fall through */
608                         case 3:
609                                 /* Setup interface, dial current phone-number, switch to next number.
610                                  * If list of phone-numbers is exhausted, increment
611                                  * retry-counter.
612                                  */
613                                 if(dev->global_flags & ISDN_GLOBAL_STOPPED || (ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_OFF)) {
614                                         char *s;
615                                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
616                                                 s = "dial suppressed: isdn system stopped";
617                                         else
618                                                 s = "dial suppressed: dialmode `off'";
619                                         isdn_net_unreachable(p->dev, NULL, s);
620                                         isdn_net_hangup(p->dev);
621                                         break;
622                                 }
623                                 cmd.driver = lp->isdn_device;
624                                 cmd.command = ISDN_CMD_SETL2;
625                                 cmd.arg = lp->isdn_channel + (lp->l2_proto << 8);
626                                 isdn_command(&cmd);
627                                 cmd.driver = lp->isdn_device;
628                                 cmd.command = ISDN_CMD_SETL3;
629                                 cmd.arg = lp->isdn_channel + (lp->l3_proto << 8);
630                                 isdn_command(&cmd);
631                                 cmd.driver = lp->isdn_device;
632                                 cmd.arg = lp->isdn_channel;
633                                 if (!lp->dial) {
634                                         printk(KERN_WARNING "%s: phone number deleted?\n",
635                                                p->dev->name);
636                                         isdn_net_hangup(p->dev);
637                                         break;
638                                 }
639                                 if (!strncmp(lp->dial->num, "LEASED", strlen("LEASED"))) {
640                                         lp->dialstate = 4;
641                                         printk(KERN_INFO "%s: Open leased line ...\n", p->dev->name);
642                                 } else {
643                                         if(lp->dialtimeout > 0)
644                                                 if (time_after(jiffies, lp->dialstarted + lp->dialtimeout)) {
645                                                         lp->dialwait_timer = jiffies + lp->dialwait;
646                                                         lp->dialstarted = 0;
647                                                         isdn_net_unreachable(p->dev, NULL, "dial: timed out");
648                                                         isdn_net_hangup(p->dev);
649                                                         break;
650                                                 }
651
652                                         cmd.driver = lp->isdn_device;
653                                         cmd.command = ISDN_CMD_DIAL;
654                                         cmd.parm.setup.si2 = 0;
655
656                                         /* check for DOV */
657                                         phone_number = lp->dial->num;
658                                         if ((*phone_number == 'v') ||
659                                             (*phone_number == 'V')) { /* DOV call */
660                                                 cmd.parm.setup.si1 = 1;
661                                         } else { /* DATA call */
662                                                 cmd.parm.setup.si1 = 7;
663                                         }
664
665                                         strcpy(cmd.parm.setup.phone, phone_number);
666                                         /*
667                                          * Switch to next number or back to start if at end of list.
668                                          */
669                                         if (!(lp->dial = (isdn_net_phone *) lp->dial->next)) {
670                                                 lp->dial = lp->phone[1];
671                                                 lp->dialretry++;
672
673                                                 if (lp->dialretry > lp->dialmax) {
674                                                         if (lp->dialtimeout == 0) {
675                                                                 lp->dialwait_timer = jiffies + lp->dialwait;
676                                                                 lp->dialstarted = 0;
677                                                                 isdn_net_unreachable(p->dev, NULL, "dial: tried all numbers dialmax times");
678                                                         }
679                                                         isdn_net_hangup(p->dev);
680                                                         break;
681                                                 }
682                                         }
683                                         sprintf(cmd.parm.setup.eazmsn, "%s",
684                                                 isdn_map_eaz2msn(lp->msn, cmd.driver));
685                                         i = isdn_dc2minor(lp->isdn_device, lp->isdn_channel);
686                                         if (i >= 0) {
687                                                 strcpy(dev->num[i], cmd.parm.setup.phone);
688                                                 dev->usage[i] |= ISDN_USAGE_OUTGOING;
689                                                 isdn_info_update();
690                                         }
691                                         printk(KERN_INFO "%s: dialing %d %s... %s\n", p->dev->name,
692                                                lp->dialretry, cmd.parm.setup.phone,
693                                                (cmd.parm.setup.si1 == 1) ? "DOV" : "");
694                                         lp->dtimer = 0;
695 #ifdef ISDN_DEBUG_NET_DIAL
696                                         printk(KERN_DEBUG "dial: d=%d c=%d\n", lp->isdn_device,
697                                                lp->isdn_channel);
698 #endif
699                                         isdn_command(&cmd);
700                                 }
701                                 lp->huptimer = 0;
702                                 lp->outgoing = 1;
703                                 if (lp->chargeint) {
704                                         lp->hupflags |= ISDN_HAVECHARGE;
705                                         lp->hupflags &= ~ISDN_WAITCHARGE;
706                                 } else {
707                                         lp->hupflags |= ISDN_WAITCHARGE;
708                                         lp->hupflags &= ~ISDN_HAVECHARGE;
709                                 }
710                                 anymore = 1;
711                                 lp->dialstate =
712                                     (lp->cbdelay &&
713                                      (lp->flags & ISDN_NET_CBOUT)) ? 12 : 4;
714                                 break;
715                         case 4:
716                                 /* Wait for D-Channel-connect.
717                                  * If timeout, switch back to state 3.
718                                  * Dialmax-handling moved to state 3.
719                                  */
720                                 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10)
721                                         lp->dialstate = 3;
722                                 anymore = 1;
723                                 break;
724                         case 5:
725                                 /* Got D-Channel-Connect, send B-Channel-request */
726                                 cmd.driver = lp->isdn_device;
727                                 cmd.arg = lp->isdn_channel;
728                                 cmd.command = ISDN_CMD_ACCEPTB;
729                                 anymore = 1;
730                                 lp->dtimer = 0;
731                                 lp->dialstate++;
732                                 isdn_command(&cmd);
733                                 break;
734                         case 6:
735                                 /* Wait for B- or D-Channel-connect. If timeout,
736                                  * switch back to state 3.
737                                  */
738 #ifdef ISDN_DEBUG_NET_DIAL
739                                 printk(KERN_DEBUG "dialtimer2: %d\n", lp->dtimer);
740 #endif
741                                 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10)
742                                         lp->dialstate = 3;
743                                 anymore = 1;
744                                 break;
745                         case 7:
746                                 /* Got incoming Call, setup L2 and L3 protocols,
747                                  * then wait for D-Channel-connect
748                                  */
749 #ifdef ISDN_DEBUG_NET_DIAL
750                                 printk(KERN_DEBUG "dialtimer4: %d\n", lp->dtimer);
751 #endif
752                                 cmd.driver = lp->isdn_device;
753                                 cmd.command = ISDN_CMD_SETL2;
754                                 cmd.arg = lp->isdn_channel + (lp->l2_proto << 8);
755                                 isdn_command(&cmd);
756                                 cmd.driver = lp->isdn_device;
757                                 cmd.command = ISDN_CMD_SETL3;
758                                 cmd.arg = lp->isdn_channel + (lp->l3_proto << 8);
759                                 isdn_command(&cmd);
760                                 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT15)
761                                         isdn_net_hangup(p->dev);
762                                 else {
763                                         anymore = 1;
764                                         lp->dialstate++;
765                                 }
766                                 break;
767                         case 9:
768                                 /* Got incoming D-Channel-Connect, send B-Channel-request */
769                                 cmd.driver = lp->isdn_device;
770                                 cmd.arg = lp->isdn_channel;
771                                 cmd.command = ISDN_CMD_ACCEPTB;
772                                 isdn_command(&cmd);
773                                 anymore = 1;
774                                 lp->dtimer = 0;
775                                 lp->dialstate++;
776                                 break;
777                         case 8:
778                         case 10:
779                                 /*  Wait for B- or D-channel-connect */
780 #ifdef ISDN_DEBUG_NET_DIAL
781                                 printk(KERN_DEBUG "dialtimer4: %d\n", lp->dtimer);
782 #endif
783                                 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10)
784                                         isdn_net_hangup(p->dev);
785                                 else
786                                         anymore = 1;
787                                 break;
788                         case 11:
789                                 /* Callback Delay */
790                                 if (lp->dtimer++ > lp->cbdelay)
791                                         lp->dialstate = 1;
792                                 anymore = 1;
793                                 break;
794                         case 12:
795                                 /* Remote does callback. Hangup after cbdelay, then wait for incoming
796                                  * call (in state 4).
797                                  */
798                                 if (lp->dtimer++ > lp->cbdelay)
799                                 {
800                                         printk(KERN_INFO "%s: hangup waiting for callback ...\n", p->dev->name);
801                                         lp->dtimer = 0;
802                                         lp->dialstate = 4;
803                                         cmd.driver = lp->isdn_device;
804                                         cmd.command = ISDN_CMD_HANGUP;
805                                         cmd.arg = lp->isdn_channel;
806                                         isdn_command(&cmd);
807                                         isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
808                                 }
809                                 anymore = 1;
810                                 break;
811                         default:
812                                 printk(KERN_WARNING "isdn_net: Illegal dialstate %d for device %s\n",
813                                        lp->dialstate, p->dev->name);
814                 }
815                 p = (isdn_net_dev *) p->next;
816         }
817         isdn_timer_ctrl(ISDN_TIMER_NETDIAL, anymore);
818 }
819
820 /*
821  * Perform hangup for a net-interface.
822  */
823 void
824 isdn_net_hangup(struct net_device *d)
825 {
826         isdn_net_local *lp = (isdn_net_local *) netdev_priv(d);
827         isdn_ctrl cmd;
828 #ifdef CONFIG_ISDN_X25
829         struct concap_proto *cprot = lp->netdev->cprot;
830         struct concap_proto_ops *pops = cprot ? cprot->pops : NULL;
831 #endif
832
833         if (lp->flags & ISDN_NET_CONNECTED) {
834                 if (lp->slave != NULL) {
835                         isdn_net_local *slp = ISDN_SLAVE_PRIV(lp);
836                         if (slp->flags & ISDN_NET_CONNECTED) {
837                                 printk(KERN_INFO
838                                         "isdn_net: hang up slave %s before %s\n",
839                                         lp->slave->name, d->name);
840                                 isdn_net_hangup(lp->slave);
841                         }
842                 }
843                 printk(KERN_INFO "isdn_net: local hangup %s\n", d->name);
844 #ifdef CONFIG_ISDN_PPP
845                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
846                         isdn_ppp_free(lp);
847 #endif
848                 isdn_net_lp_disconnected(lp);
849 #ifdef CONFIG_ISDN_X25
850                 /* try if there are generic encap protocol
851                    receiver routines and signal the closure of
852                    the link */
853                 if( pops && pops -> disconn_ind )
854                   pops -> disconn_ind(cprot);
855 #endif /* CONFIG_ISDN_X25 */
856
857                 cmd.driver = lp->isdn_device;
858                 cmd.command = ISDN_CMD_HANGUP;
859                 cmd.arg = lp->isdn_channel;
860                 isdn_command(&cmd);
861                 printk(KERN_INFO "%s: Chargesum is %d\n", d->name, lp->charge);
862                 isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
863         }
864         isdn_net_unbind_channel(lp);
865 }
866
867 typedef struct {
868         __be16 source;
869         __be16 dest;
870 } ip_ports;
871
872 static void
873 isdn_net_log_skb(struct sk_buff * skb, isdn_net_local * lp)
874 {
875         /* hopefully, this was set correctly */
876         const u_char *p = skb_network_header(skb);
877         unsigned short proto = ntohs(skb->protocol);
878         int data_ofs;
879         ip_ports *ipp;
880         char addinfo[100];
881
882         addinfo[0] = '\0';
883         /* This check stolen from 2.1.72 dev_queue_xmit_nit() */
884         if (p < skb->data || skb->network_header >= skb->tail) {
885                 /* fall back to old isdn_net_log_packet method() */
886                 char * buf = skb->data;
887
888                 printk(KERN_DEBUG "isdn_net: protocol %04x is buggy, dev %s\n", skb->protocol, lp->netdev->dev->name);
889                 p = buf;
890                 proto = ETH_P_IP;
891                 switch (lp->p_encap) {
892                         case ISDN_NET_ENCAP_IPTYP:
893                                 proto = ntohs(*(__be16 *)&buf[0]);
894                                 p = &buf[2];
895                                 break;
896                         case ISDN_NET_ENCAP_ETHER:
897                                 proto = ntohs(*(__be16 *)&buf[12]);
898                                 p = &buf[14];
899                                 break;
900                         case ISDN_NET_ENCAP_CISCOHDLC:
901                                 proto = ntohs(*(__be16 *)&buf[2]);
902                                 p = &buf[4];
903                                 break;
904 #ifdef CONFIG_ISDN_PPP
905                         case ISDN_NET_ENCAP_SYNCPPP:
906                                 proto = ntohs(skb->protocol);
907                                 p = &buf[IPPP_MAX_HEADER];
908                                 break;
909 #endif
910                 }
911         }
912         data_ofs = ((p[0] & 15) * 4);
913         switch (proto) {
914                 case ETH_P_IP:
915                         switch (p[9]) {
916                                 case 1:
917                                         strcpy(addinfo, " ICMP");
918                                         break;
919                                 case 2:
920                                         strcpy(addinfo, " IGMP");
921                                         break;
922                                 case 4:
923                                         strcpy(addinfo, " IPIP");
924                                         break;
925                                 case 6:
926                                         ipp = (ip_ports *) (&p[data_ofs]);
927                                         sprintf(addinfo, " TCP, port: %d -> %d", ntohs(ipp->source),
928                                                 ntohs(ipp->dest));
929                                         break;
930                                 case 8:
931                                         strcpy(addinfo, " EGP");
932                                         break;
933                                 case 12:
934                                         strcpy(addinfo, " PUP");
935                                         break;
936                                 case 17:
937                                         ipp = (ip_ports *) (&p[data_ofs]);
938                                         sprintf(addinfo, " UDP, port: %d -> %d", ntohs(ipp->source),
939                                                 ntohs(ipp->dest));
940                                         break;
941                                 case 22:
942                                         strcpy(addinfo, " IDP");
943                                         break;
944                         }
945                         printk(KERN_INFO "OPEN: %pI4 -> %pI4%s\n",
946                                p + 12, p + 16, addinfo);
947                         break;
948                 case ETH_P_ARP:
949                         printk(KERN_INFO "OPEN: ARP %pI4 -> *.*.*.* ?%pI4\n",
950                                p + 14, p + 24);
951                         break;
952         }
953 }
954
955 /*
956  * this function is used to send supervisory data, i.e. data which was
957  * not received from the network layer, but e.g. frames from ipppd, CCP
958  * reset frames etc.
959  */
960 void isdn_net_write_super(isdn_net_local *lp, struct sk_buff *skb)
961 {
962         if (in_irq()) {
963                 // we can't grab the lock from irq context, 
964                 // so we just queue the packet
965                 skb_queue_tail(&lp->super_tx_queue, skb);
966                 schedule_work(&lp->tqueue);
967                 return;
968         }
969
970         spin_lock_bh(&lp->xmit_lock);
971         if (!isdn_net_lp_busy(lp)) {
972                 isdn_net_writebuf_skb(lp, skb);
973         } else {
974                 skb_queue_tail(&lp->super_tx_queue, skb);
975         }
976         spin_unlock_bh(&lp->xmit_lock);
977 }
978
979 /*
980  * called from tq_immediate
981  */
982 static void isdn_net_softint(struct work_struct *work)
983 {
984         isdn_net_local *lp = container_of(work, isdn_net_local, tqueue);
985         struct sk_buff *skb;
986
987         spin_lock_bh(&lp->xmit_lock);
988         while (!isdn_net_lp_busy(lp)) {
989                 skb = skb_dequeue(&lp->super_tx_queue);
990                 if (!skb)
991                         break;
992                 isdn_net_writebuf_skb(lp, skb);                                
993         }
994         spin_unlock_bh(&lp->xmit_lock);
995 }
996
997 /* 
998  * all frames sent from the (net) LL to a HL driver should go via this function
999  * it's serialized by the caller holding the lp->xmit_lock spinlock
1000  */
1001 void isdn_net_writebuf_skb(isdn_net_local *lp, struct sk_buff *skb)
1002 {
1003         int ret;
1004         int len = skb->len;     /* save len */
1005
1006         /* before obtaining the lock the caller should have checked that
1007            the lp isn't busy */
1008         if (isdn_net_lp_busy(lp)) {
1009                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1010                 goto error;
1011         }
1012
1013         if (!(lp->flags & ISDN_NET_CONNECTED)) {
1014                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1015                 goto error;
1016         }
1017         ret = isdn_writebuf_skb_stub(lp->isdn_device, lp->isdn_channel, 1, skb);
1018         if (ret != len) {
1019                 /* we should never get here */
1020                 printk(KERN_WARNING "%s: HL driver queue full\n", lp->netdev->dev->name);
1021                 goto error;
1022         }
1023         
1024         lp->transcount += len;
1025         isdn_net_inc_frame_cnt(lp);
1026         return;
1027
1028  error:
1029         dev_kfree_skb(skb);
1030         lp->stats.tx_errors++;
1031
1032 }
1033
1034
1035 /*
1036  *  Helper function for isdn_net_start_xmit.
1037  *  When called, the connection is already established.
1038  *  Based on cps-calculation, check if device is overloaded.
1039  *  If so, and if a slave exists, trigger dialing for it.
1040  *  If any slave is online, deliver packets using a simple round robin
1041  *  scheme.
1042  *
1043  *  Return: 0 on success, !0 on failure.
1044  */
1045
1046 static int
1047 isdn_net_xmit(struct net_device *ndev, struct sk_buff *skb)
1048 {
1049         isdn_net_dev *nd;
1050         isdn_net_local *slp;
1051         isdn_net_local *lp = (isdn_net_local *) netdev_priv(ndev);
1052         int retv = 0;
1053
1054         if (((isdn_net_local *) netdev_priv(ndev))->master) {
1055                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1056                 dev_kfree_skb(skb);
1057                 return 0;
1058         }
1059
1060         /* For the other encaps the header has already been built */
1061 #ifdef CONFIG_ISDN_PPP
1062         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
1063                 return isdn_ppp_xmit(skb, ndev);
1064         }
1065 #endif
1066         nd = ((isdn_net_local *) netdev_priv(ndev))->netdev;
1067         lp = isdn_net_get_locked_lp(nd);
1068         if (!lp) {
1069                 printk(KERN_WARNING "%s: all channels busy - requeuing!\n", ndev->name);
1070                 return 1;
1071         }
1072         /* we have our lp locked from now on */
1073
1074         /* Reset hangup-timeout */
1075         lp->huptimer = 0; // FIXME?
1076         isdn_net_writebuf_skb(lp, skb);
1077         spin_unlock_bh(&lp->xmit_lock);
1078
1079         /* the following stuff is here for backwards compatibility.
1080          * in future, start-up and hangup of slaves (based on current load)
1081          * should move to userspace and get based on an overall cps
1082          * calculation
1083          */
1084         if (lp->cps > lp->triggercps) {
1085                 if (lp->slave) {
1086                         if (!lp->sqfull) {
1087                                 /* First time overload: set timestamp only */
1088                                 lp->sqfull = 1;
1089                                 lp->sqfull_stamp = jiffies;
1090                         } else {
1091                                 /* subsequent overload: if slavedelay exceeded, start dialing */
1092                                 if (time_after(jiffies, lp->sqfull_stamp + lp->slavedelay)) {
1093                                         slp = ISDN_SLAVE_PRIV(lp);
1094                                         if (!(slp->flags & ISDN_NET_CONNECTED)) {
1095                                                 isdn_net_force_dial_lp(ISDN_SLAVE_PRIV(lp));
1096                                         }
1097                                 }
1098                         }
1099                 }
1100         } else {
1101                 if (lp->sqfull && time_after(jiffies, lp->sqfull_stamp + lp->slavedelay + (10 * HZ))) {
1102                         lp->sqfull = 0;
1103                 }
1104                 /* this is a hack to allow auto-hangup for slaves on moderate loads */
1105                 nd->queue = nd->local;
1106         }
1107
1108         return retv;
1109
1110 }
1111
1112 static void
1113 isdn_net_adjust_hdr(struct sk_buff *skb, struct net_device *dev)
1114 {
1115         isdn_net_local *lp = (isdn_net_local *) netdev_priv(dev);
1116         if (!skb)
1117                 return;
1118         if (lp->p_encap == ISDN_NET_ENCAP_ETHER) {
1119                 const int pullsize = skb_network_offset(skb) - ETH_HLEN;
1120                 if (pullsize > 0) {
1121                         printk(KERN_DEBUG "isdn_net: Pull junk %d\n", pullsize);
1122                         skb_pull(skb, pullsize);
1123                 }
1124         }
1125 }
1126
1127
1128 static void isdn_net_tx_timeout(struct net_device * ndev)
1129 {
1130         isdn_net_local *lp = (isdn_net_local *) netdev_priv(ndev);
1131
1132         printk(KERN_WARNING "isdn_tx_timeout dev %s dialstate %d\n", ndev->name, lp->dialstate);
1133         if (!lp->dialstate){
1134                 lp->stats.tx_errors++;
1135                 /*
1136                  * There is a certain probability that this currently
1137                  * works at all because if we always wake up the interface,
1138                  * then upper layer will try to send the next packet
1139                  * immediately. And then, the old clean_up logic in the
1140                  * driver will hopefully continue to work as it used to do.
1141                  *
1142                  * This is rather primitive right know, we better should
1143                  * clean internal queues here, in particular for multilink and
1144                  * ppp, and reset HL driver's channel, too.   --HE
1145                  *
1146                  * actually, this may not matter at all, because ISDN hardware
1147                  * should not see transmitter hangs at all IMO
1148                  * changed KERN_DEBUG to KERN_WARNING to find out if this is 
1149                  * ever called   --KG
1150                  */
1151         }
1152         ndev->trans_start = jiffies;
1153         netif_wake_queue(ndev);
1154 }
1155
1156 /*
1157  * Try sending a packet.
1158  * If this interface isn't connected to a ISDN-Channel, find a free channel,
1159  * and start dialing.
1160  */
1161 static int
1162 isdn_net_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1163 {
1164         isdn_net_local *lp = (isdn_net_local *) netdev_priv(ndev);
1165 #ifdef CONFIG_ISDN_X25
1166         struct concap_proto * cprot = lp -> netdev -> cprot;
1167 /* At this point hard_start_xmit() passes control to the encapsulation
1168    protocol (if present).
1169    For X.25 auto-dialing is completly bypassed because:
1170    - It does not conform with the semantics of a reliable datalink
1171      service as needed by X.25 PLP.
1172    - I don't want that the interface starts dialing when the network layer
1173      sends a message which requests to disconnect the lapb link (or if it
1174      sends any other message not resulting in data transmission).
1175    Instead, dialing will be initiated by the encapsulation protocol entity
1176    when a dl_establish request is received from the upper layer.
1177 */
1178         if (cprot && cprot -> pops) {
1179                 int ret = cprot -> pops -> encap_and_xmit ( cprot , skb);
1180
1181                 if (ret)
1182                         netif_stop_queue(ndev);
1183                 return ret;
1184         } else
1185 #endif
1186         /* auto-dialing xmit function */
1187         {
1188 #ifdef ISDN_DEBUG_NET_DUMP
1189                 u_char *buf;
1190 #endif
1191                 isdn_net_adjust_hdr(skb, ndev);
1192 #ifdef ISDN_DEBUG_NET_DUMP
1193                 buf = skb->data;
1194                 isdn_dumppkt("S:", buf, skb->len, 40);
1195 #endif
1196
1197                 if (!(lp->flags & ISDN_NET_CONNECTED)) {
1198                         int chi;
1199                         /* only do autodial if allowed by config */
1200                         if (!(ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_AUTO)) {
1201                                 isdn_net_unreachable(ndev, skb, "dial rejected: interface not in dialmode `auto'");
1202                                 dev_kfree_skb(skb);
1203                                 return 0;
1204                         }
1205                         if (lp->phone[1]) {
1206                                 ulong flags;
1207
1208                                 if(lp->dialwait_timer <= 0)
1209                                         if(lp->dialstarted > 0 && lp->dialtimeout > 0 && time_before(jiffies, lp->dialstarted + lp->dialtimeout + lp->dialwait))
1210                                                 lp->dialwait_timer = lp->dialstarted + lp->dialtimeout + lp->dialwait;
1211
1212                                 if(lp->dialwait_timer > 0) {
1213                                         if(time_before(jiffies, lp->dialwait_timer)) {
1214                                                 isdn_net_unreachable(ndev, skb, "dial rejected: retry-time not reached");
1215                                                 dev_kfree_skb(skb);
1216                                                 return 0;
1217                                         } else
1218                                                 lp->dialwait_timer = 0;
1219                                 }
1220                                 /* Grab a free ISDN-Channel */
1221                                 spin_lock_irqsave(&dev->lock, flags);
1222                                 if (((chi =
1223                                      isdn_get_free_channel(
1224                                                         ISDN_USAGE_NET,
1225                                                         lp->l2_proto,
1226                                                         lp->l3_proto,
1227                                                         lp->pre_device,
1228                                                         lp->pre_channel,
1229                                                         lp->msn)
1230                                                         ) < 0) &&
1231                                         ((chi =
1232                                      isdn_get_free_channel(
1233                                                         ISDN_USAGE_NET,
1234                                                         lp->l2_proto,
1235                                                         lp->l3_proto,
1236                                                         lp->pre_device,
1237                                                         lp->pre_channel^1,
1238                                                         lp->msn)
1239                                                         ) < 0)) {
1240                                         spin_unlock_irqrestore(&dev->lock, flags);
1241                                         isdn_net_unreachable(ndev, skb,
1242                                                            "No channel");
1243                                         dev_kfree_skb(skb);
1244                                         return 0;
1245                                 }
1246                                 /* Log packet, which triggered dialing */
1247                                 if (dev->net_verbose)
1248                                         isdn_net_log_skb(skb, lp);
1249                                 lp->dialstate = 1;
1250                                 /* Connect interface with channel */
1251                                 isdn_net_bind_channel(lp, chi);
1252 #ifdef CONFIG_ISDN_PPP
1253                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
1254                                         /* no 'first_skb' handling for syncPPP */
1255                                         if (isdn_ppp_bind(lp) < 0) {
1256                                                 dev_kfree_skb(skb);
1257                                                 isdn_net_unbind_channel(lp);
1258                                                 spin_unlock_irqrestore(&dev->lock, flags);
1259                                                 return 0;       /* STN (skb to nirvana) ;) */
1260                                         }
1261 #ifdef CONFIG_IPPP_FILTER
1262                                         if (isdn_ppp_autodial_filter(skb, lp)) {
1263                                                 isdn_ppp_free(lp);
1264                                                 isdn_net_unbind_channel(lp);
1265                                                 spin_unlock_irqrestore(&dev->lock, flags);
1266                                                 isdn_net_unreachable(ndev, skb, "dial rejected: packet filtered");
1267                                                 dev_kfree_skb(skb);
1268                                                 return 0;
1269                                         }
1270 #endif
1271                                         spin_unlock_irqrestore(&dev->lock, flags);
1272                                         isdn_net_dial();        /* Initiate dialing */
1273                                         netif_stop_queue(ndev);
1274                                         return 1;       /* let upper layer requeue skb packet */
1275                                 }
1276 #endif
1277                                 /* Initiate dialing */
1278                                 spin_unlock_irqrestore(&dev->lock, flags);
1279                                 isdn_net_dial();
1280                                 isdn_net_device_stop_queue(lp);
1281                                 return 1;
1282                         } else {
1283                                 isdn_net_unreachable(ndev, skb,
1284                                                      "No phone number");
1285                                 dev_kfree_skb(skb);
1286                                 return 0;
1287                         }
1288                 } else {
1289                         /* Device is connected to an ISDN channel */ 
1290                         ndev->trans_start = jiffies;
1291                         if (!lp->dialstate) {
1292                                 /* ISDN connection is established, try sending */
1293                                 int ret;
1294                                 ret = (isdn_net_xmit(ndev, skb));
1295                                 if(ret) netif_stop_queue(ndev);
1296                                 return ret;
1297                         } else
1298                                 netif_stop_queue(ndev);
1299                 }
1300         }
1301         return 1;
1302 }
1303
1304 /*
1305  * Shutdown a net-interface.
1306  */
1307 static int
1308 isdn_net_close(struct net_device *dev)
1309 {
1310         struct net_device *p;
1311 #ifdef CONFIG_ISDN_X25
1312         struct concap_proto * cprot =
1313                 ((isdn_net_local *) netdev_priv(dev))->netdev->cprot;
1314         /* printk(KERN_DEBUG "isdn_net_close %s\n" , dev-> name ); */
1315 #endif
1316
1317 #ifdef CONFIG_ISDN_X25
1318         if( cprot && cprot -> pops ) cprot -> pops -> close( cprot );
1319 #endif
1320         netif_stop_queue(dev);
1321         p = MASTER_TO_SLAVE(dev);
1322         if (p) {
1323                 /* If this interface has slaves, stop them also */
1324                 while (p) {
1325 #ifdef CONFIG_ISDN_X25
1326                         cprot = ((isdn_net_local *) netdev_priv(p))
1327                                 -> netdev -> cprot;
1328                         if( cprot && cprot -> pops )
1329                                 cprot -> pops -> close( cprot );
1330 #endif
1331                         isdn_net_hangup(p);
1332                         p = MASTER_TO_SLAVE(p);
1333                 }
1334         }
1335         isdn_net_hangup(dev);
1336         isdn_unlock_drivers();
1337         return 0;
1338 }
1339
1340 /*
1341  * Get statistics
1342  */
1343 static struct net_device_stats *
1344 isdn_net_get_stats(struct net_device *dev)
1345 {
1346         isdn_net_local *lp = (isdn_net_local *) netdev_priv(dev);
1347         return &lp->stats;
1348 }
1349
1350 /*      This is simply a copy from std. eth.c EXCEPT we pull ETH_HLEN
1351  *      instead of dev->hard_header_len off. This is done because the
1352  *      lowlevel-driver has already pulled off its stuff when we get
1353  *      here and this routine only gets called with p_encap == ETHER.
1354  *      Determine the packet's protocol ID. The rule here is that we
1355  *      assume 802.3 if the type field is short enough to be a length.
1356  *      This is normal practice and works for any 'now in use' protocol.
1357  */
1358
1359 static __be16
1360 isdn_net_type_trans(struct sk_buff *skb, struct net_device *dev)
1361 {
1362         struct ethhdr *eth;
1363         unsigned char *rawp;
1364
1365         skb_reset_mac_header(skb);
1366         skb_pull(skb, ETH_HLEN);
1367         eth = eth_hdr(skb);
1368
1369         if (*eth->h_dest & 1) {
1370                 if (memcmp(eth->h_dest, dev->broadcast, ETH_ALEN) == 0)
1371                         skb->pkt_type = PACKET_BROADCAST;
1372                 else
1373                         skb->pkt_type = PACKET_MULTICAST;
1374         }
1375         /*
1376          *      This ALLMULTI check should be redundant by 1.4
1377          *      so don't forget to remove it.
1378          */
1379
1380         else if (dev->flags & (IFF_PROMISC /*| IFF_ALLMULTI*/)) {
1381                 if (memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN))
1382                         skb->pkt_type = PACKET_OTHERHOST;
1383         }
1384         if (ntohs(eth->h_proto) >= 1536)
1385                 return eth->h_proto;
1386
1387         rawp = skb->data;
1388
1389         /*
1390          *      This is a magic hack to spot IPX packets. Older Novell breaks
1391          *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
1392          *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
1393          *      won't work for fault tolerant netware but does for the rest.
1394          */
1395         if (*(unsigned short *) rawp == 0xFFFF)
1396                 return htons(ETH_P_802_3);
1397         /*
1398          *      Real 802.2 LLC
1399          */
1400         return htons(ETH_P_802_2);
1401 }
1402
1403
1404 /* 
1405  * CISCO HDLC keepalive specific stuff
1406  */
1407 static struct sk_buff*
1408 isdn_net_ciscohdlck_alloc_skb(isdn_net_local *lp, int len)
1409 {
1410         unsigned short hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen;
1411         struct sk_buff *skb;
1412
1413         skb = alloc_skb(hl + len, GFP_ATOMIC);
1414         if (skb)
1415                 skb_reserve(skb, hl);
1416         else 
1417                 printk("isdn out of mem at %s:%d!\n", __FILE__, __LINE__);
1418         return skb;
1419 }
1420
1421 /* cisco hdlck device private ioctls */
1422 static int
1423 isdn_ciscohdlck_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1424 {
1425         isdn_net_local *lp = (isdn_net_local *) netdev_priv(dev);
1426         unsigned long len = 0;
1427         unsigned long expires = 0;
1428         int tmp = 0;
1429         int period = lp->cisco_keepalive_period;
1430         s8 debserint = lp->cisco_debserint;
1431         int rc = 0;
1432
1433         if (lp->p_encap != ISDN_NET_ENCAP_CISCOHDLCK)
1434                 return -EINVAL;
1435
1436         switch (cmd) {
1437                 /* get/set keepalive period */
1438                 case SIOCGKEEPPERIOD:
1439                         len = (unsigned long)sizeof(lp->cisco_keepalive_period);
1440                         if (copy_to_user(ifr->ifr_data,
1441                                 &lp->cisco_keepalive_period, len))
1442                                 rc = -EFAULT;
1443                         break;
1444                 case SIOCSKEEPPERIOD:
1445                         tmp = lp->cisco_keepalive_period;
1446                         len = (unsigned long)sizeof(lp->cisco_keepalive_period);
1447                         if (copy_from_user(&period, ifr->ifr_data, len))
1448                                 rc = -EFAULT;
1449                         if ((period > 0) && (period <= 32767))
1450                                 lp->cisco_keepalive_period = period;
1451                         else
1452                                 rc = -EINVAL;
1453                         if (!rc && (tmp != lp->cisco_keepalive_period)) {
1454                                 expires = (unsigned long)(jiffies +
1455                                         lp->cisco_keepalive_period * HZ);
1456                                 mod_timer(&lp->cisco_timer, expires);
1457                                 printk(KERN_INFO "%s: Keepalive period set "
1458                                         "to %d seconds.\n",
1459                                         dev->name, lp->cisco_keepalive_period);
1460                         }
1461                         break;
1462
1463                 /* get/set debugging */
1464                 case SIOCGDEBSERINT:
1465                         len = (unsigned long)sizeof(lp->cisco_debserint);
1466                         if (copy_to_user(ifr->ifr_data,
1467                                 &lp->cisco_debserint, len))
1468                                 rc = -EFAULT;
1469                         break;
1470                 case SIOCSDEBSERINT:
1471                         len = (unsigned long)sizeof(lp->cisco_debserint);
1472                         if (copy_from_user(&debserint,
1473                                 ifr->ifr_data, len))
1474                                 rc = -EFAULT;
1475                         if ((debserint >= 0) && (debserint <= 64))
1476                                 lp->cisco_debserint = debserint;
1477                         else
1478                                 rc = -EINVAL;
1479                         break;
1480
1481                 default:
1482                         rc = -EINVAL;
1483                         break;
1484         }
1485         return (rc);
1486 }
1487
1488 /* called via cisco_timer.function */
1489 static void
1490 isdn_net_ciscohdlck_slarp_send_keepalive(unsigned long data)
1491 {
1492         isdn_net_local *lp = (isdn_net_local *) data;
1493         struct sk_buff *skb;
1494         unsigned char *p;
1495         unsigned long last_cisco_myseq = lp->cisco_myseq;
1496         int myseq_diff = 0;
1497
1498         if (!(lp->flags & ISDN_NET_CONNECTED) || lp->dialstate) {
1499                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1500                 return;
1501         }
1502         lp->cisco_myseq++;
1503
1504         myseq_diff = (lp->cisco_myseq - lp->cisco_mineseen);
1505         if ((lp->cisco_line_state) && ((myseq_diff >= 3)||(myseq_diff <= -3))) {
1506                 /* line up -> down */
1507                 lp->cisco_line_state = 0;
1508                 printk (KERN_WARNING
1509                                 "UPDOWN: Line protocol on Interface %s,"
1510                                 " changed state to down\n", lp->netdev->dev->name);
1511                 /* should stop routing higher-level data accross */
1512         } else if ((!lp->cisco_line_state) &&
1513                 (myseq_diff >= 0) && (myseq_diff <= 2)) {
1514                 /* line down -> up */
1515                 lp->cisco_line_state = 1;
1516                 printk (KERN_WARNING
1517                                 "UPDOWN: Line protocol on Interface %s,"
1518                                 " changed state to up\n", lp->netdev->dev->name);
1519                 /* restart routing higher-level data accross */
1520         }
1521
1522         if (lp->cisco_debserint)
1523                 printk (KERN_DEBUG "%s: HDLC "
1524                         "myseq %lu, mineseen %lu%c, yourseen %lu, %s\n",
1525                         lp->netdev->dev->name, last_cisco_myseq, lp->cisco_mineseen,
1526                         ((last_cisco_myseq == lp->cisco_mineseen) ? '*' : 040),
1527                         lp->cisco_yourseq,
1528                         ((lp->cisco_line_state) ? "line up" : "line down"));
1529
1530         skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14);
1531         if (!skb)
1532                 return;
1533
1534         p = skb_put(skb, 4 + 14);
1535
1536         /* cisco header */
1537         *(u8 *)(p + 0) = CISCO_ADDR_UNICAST;
1538         *(u8 *)(p + 1) = CISCO_CTRL;
1539         *(__be16 *)(p + 2) = cpu_to_be16(CISCO_TYPE_SLARP);
1540
1541         /* slarp keepalive */
1542         *(__be32 *)(p +  4) = cpu_to_be32(CISCO_SLARP_KEEPALIVE);
1543         *(__be32 *)(p +  8) = cpu_to_be32(lp->cisco_myseq);
1544         *(__be32 *)(p + 12) = cpu_to_be32(lp->cisco_yourseq);
1545         *(__be16 *)(p + 16) = cpu_to_be16(0xffff); // reliablity, always 0xffff
1546         p += 18;
1547
1548         isdn_net_write_super(lp, skb);
1549
1550         lp->cisco_timer.expires = jiffies + lp->cisco_keepalive_period * HZ;
1551         
1552         add_timer(&lp->cisco_timer);
1553 }
1554
1555 static void
1556 isdn_net_ciscohdlck_slarp_send_request(isdn_net_local *lp)
1557 {
1558         struct sk_buff *skb;
1559         unsigned char *p;
1560
1561         skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14);
1562         if (!skb)
1563                 return;
1564
1565         p = skb_put(skb, 4 + 14);
1566
1567         /* cisco header */
1568         *(u8 *)(p + 0) = CISCO_ADDR_UNICAST;
1569         *(u8 *)(p + 1) = CISCO_CTRL;
1570         *(__be16 *)(p + 2) = cpu_to_be16(CISCO_TYPE_SLARP);
1571
1572         /* slarp request */
1573         *(__be32 *)(p +  4) = cpu_to_be32(CISCO_SLARP_REQUEST);
1574         *(__be32 *)(p +  8) = cpu_to_be32(0); // address
1575         *(__be32 *)(p + 12) = cpu_to_be32(0); // netmask
1576         *(__be16 *)(p + 16) = cpu_to_be16(0); // unused
1577         p += 18;
1578
1579         isdn_net_write_super(lp, skb);
1580 }
1581
1582 static void 
1583 isdn_net_ciscohdlck_connected(isdn_net_local *lp)
1584 {
1585         lp->cisco_myseq = 0;
1586         lp->cisco_mineseen = 0;
1587         lp->cisco_yourseq = 0;
1588         lp->cisco_keepalive_period = ISDN_TIMER_KEEPINT;
1589         lp->cisco_last_slarp_in = 0;
1590         lp->cisco_line_state = 0;
1591         lp->cisco_debserint = 0;
1592
1593         /* send slarp request because interface/seq.no.s reset */
1594         isdn_net_ciscohdlck_slarp_send_request(lp);
1595
1596         init_timer(&lp->cisco_timer);
1597         lp->cisco_timer.data = (unsigned long) lp;
1598         lp->cisco_timer.function = isdn_net_ciscohdlck_slarp_send_keepalive;
1599         lp->cisco_timer.expires = jiffies + lp->cisco_keepalive_period * HZ;
1600         add_timer(&lp->cisco_timer);
1601 }
1602
1603 static void 
1604 isdn_net_ciscohdlck_disconnected(isdn_net_local *lp)
1605 {
1606         del_timer(&lp->cisco_timer);
1607 }
1608
1609 static void
1610 isdn_net_ciscohdlck_slarp_send_reply(isdn_net_local *lp)
1611 {
1612         struct sk_buff *skb;
1613         unsigned char *p;
1614         struct in_device *in_dev = NULL;
1615         __be32 addr = 0;                /* local ipv4 address */
1616         __be32 mask = 0;                /* local netmask */
1617
1618         if ((in_dev = lp->netdev->dev->ip_ptr) != NULL) {
1619                 /* take primary(first) address of interface */
1620                 struct in_ifaddr *ifa = in_dev->ifa_list;
1621                 if (ifa != NULL) {
1622                         addr = ifa->ifa_local;
1623                         mask = ifa->ifa_mask;
1624                 }
1625         }
1626
1627         skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14);
1628         if (!skb)
1629                 return;
1630
1631         p = skb_put(skb, 4 + 14);
1632
1633         /* cisco header */
1634         *(u8 *)(p + 0) = CISCO_ADDR_UNICAST;
1635         *(u8 *)(p + 1) = CISCO_CTRL;
1636         *(__be16 *)(p + 2) = cpu_to_be16(CISCO_TYPE_SLARP);
1637
1638         /* slarp reply, send own ip/netmask; if values are nonsense remote
1639          * should think we are unable to provide it with an address via SLARP */
1640         *(__be32 *)(p +  4) = cpu_to_be32(CISCO_SLARP_REPLY);
1641         *(__be32 *)(p +  8) = addr; // address
1642         *(__be32 *)(p + 12) = mask; // netmask
1643         *(__be16 *)(p + 16) = cpu_to_be16(0); // unused
1644         p += 18;
1645
1646         isdn_net_write_super(lp, skb);
1647 }
1648
1649 static void
1650 isdn_net_ciscohdlck_slarp_in(isdn_net_local *lp, struct sk_buff *skb)
1651 {
1652         unsigned char *p;
1653         int period;
1654         u32 code;
1655         u32 my_seq;
1656         u32 your_seq;
1657         __be32 local;
1658         __be32 *addr, *mask;
1659         u16 unused;
1660
1661         if (skb->len < 14)
1662                 return;
1663
1664         p = skb->data;
1665         code = be32_to_cpup((__be32 *)p);
1666         p += 4;
1667
1668         switch (code) {
1669         case CISCO_SLARP_REQUEST:
1670                 lp->cisco_yourseq = 0;
1671                 isdn_net_ciscohdlck_slarp_send_reply(lp);
1672                 break;
1673         case CISCO_SLARP_REPLY:
1674                 addr = (__be32 *)p;
1675                 mask = (__be32 *)(p + 4);
1676                 if (*mask != cpu_to_be32(0xfffffffc))
1677                         goto slarp_reply_out;
1678                 if ((*addr & cpu_to_be32(3)) == cpu_to_be32(0) ||
1679                     (*addr & cpu_to_be32(3)) == cpu_to_be32(3))
1680                         goto slarp_reply_out;
1681                 local = *addr ^ cpu_to_be32(3);
1682                 printk(KERN_INFO "%s: got slarp reply: remote ip: %pI4, local ip: %pI4 mask: %pI4\n",
1683                        lp->netdev->dev->name, addr, &local, mask);
1684                 break;
1685   slarp_reply_out:
1686                 printk(KERN_INFO "%s: got invalid slarp reply (%pI4/%pI4) - ignored\n",
1687                        lp->netdev->dev->name, addr, mask);
1688                 break;
1689         case CISCO_SLARP_KEEPALIVE:
1690                 period = (int)((jiffies - lp->cisco_last_slarp_in
1691                                 + HZ/2 - 1) / HZ);
1692                 if (lp->cisco_debserint &&
1693                                 (period != lp->cisco_keepalive_period) &&
1694                                 lp->cisco_last_slarp_in) {
1695                         printk(KERN_DEBUG "%s: Keepalive period mismatch - "
1696                                 "is %d but should be %d.\n",
1697                                 lp->netdev->dev->name, period,
1698                                 lp->cisco_keepalive_period);
1699                 }
1700                 lp->cisco_last_slarp_in = jiffies;
1701                 my_seq = be32_to_cpup((__be32 *)(p + 0));
1702                 your_seq = be32_to_cpup((__be32 *)(p + 4));
1703                 unused = be16_to_cpup((__be16 *)(p + 8));
1704                 p += 10;
1705                 lp->cisco_yourseq = my_seq;
1706                 lp->cisco_mineseen = your_seq;
1707                 break;
1708         }
1709 }
1710
1711 static void
1712 isdn_net_ciscohdlck_receive(isdn_net_local *lp, struct sk_buff *skb)
1713 {
1714         unsigned char *p;
1715         u8 addr;
1716         u8 ctrl;
1717         u16 type;
1718         
1719         if (skb->len < 4)
1720                 goto out_free;
1721
1722         p = skb->data;
1723         addr = *(u8 *)(p + 0);
1724         ctrl = *(u8 *)(p + 1);
1725         type = be16_to_cpup((__be16 *)(p + 2));
1726         p += 4;
1727         skb_pull(skb, 4);
1728         
1729         if (addr != CISCO_ADDR_UNICAST && addr != CISCO_ADDR_BROADCAST) {
1730                 printk(KERN_WARNING "%s: Unknown Cisco addr 0x%02x\n",
1731                        lp->netdev->dev->name, addr);
1732                 goto out_free;
1733         }
1734         if (ctrl != CISCO_CTRL) {
1735                 printk(KERN_WARNING "%s: Unknown Cisco ctrl 0x%02x\n",
1736                        lp->netdev->dev->name, ctrl);
1737                 goto out_free;
1738         }
1739
1740         switch (type) {
1741         case CISCO_TYPE_SLARP:
1742                 isdn_net_ciscohdlck_slarp_in(lp, skb);
1743                 goto out_free;
1744         case CISCO_TYPE_CDP:
1745                 if (lp->cisco_debserint)
1746                         printk(KERN_DEBUG "%s: Received CDP packet. use "
1747                                 "\"no cdp enable\" on cisco.\n",
1748                                 lp->netdev->dev->name);
1749                 goto out_free;
1750         default:
1751                 /* no special cisco protocol */
1752                 skb->protocol = htons(type);
1753                 netif_rx(skb);
1754                 return;
1755         }
1756
1757  out_free:
1758         kfree_skb(skb);
1759 }
1760
1761 /*
1762  * Got a packet from ISDN-Channel.
1763  */
1764 static void
1765 isdn_net_receive(struct net_device *ndev, struct sk_buff *skb)
1766 {
1767         isdn_net_local *lp = (isdn_net_local *) netdev_priv(ndev);
1768         isdn_net_local *olp = lp;       /* original 'lp' */
1769 #ifdef CONFIG_ISDN_X25
1770         struct concap_proto *cprot = lp -> netdev -> cprot;
1771 #endif
1772         lp->transcount += skb->len;
1773
1774         lp->stats.rx_packets++;
1775         lp->stats.rx_bytes += skb->len;
1776         if (lp->master) {
1777                 /* Bundling: If device is a slave-device, deliver to master, also
1778                  * handle master's statistics and hangup-timeout
1779                  */
1780                 ndev = lp->master;
1781                 lp = (isdn_net_local *) netdev_priv(ndev);
1782                 lp->stats.rx_packets++;
1783                 lp->stats.rx_bytes += skb->len;
1784         }
1785         skb->dev = ndev;
1786         skb->pkt_type = PACKET_HOST;
1787         skb_reset_mac_header(skb);
1788 #ifdef ISDN_DEBUG_NET_DUMP
1789         isdn_dumppkt("R:", skb->data, skb->len, 40);
1790 #endif
1791         switch (lp->p_encap) {
1792                 case ISDN_NET_ENCAP_ETHER:
1793                         /* Ethernet over ISDN */
1794                         olp->huptimer = 0;
1795                         lp->huptimer = 0;
1796                         skb->protocol = isdn_net_type_trans(skb, ndev);
1797                         break;
1798                 case ISDN_NET_ENCAP_UIHDLC:
1799                         /* HDLC with UI-frame (for ispa with -h1 option) */
1800                         olp->huptimer = 0;
1801                         lp->huptimer = 0;
1802                         skb_pull(skb, 2);
1803                         /* Fall through */
1804                 case ISDN_NET_ENCAP_RAWIP:
1805                         /* RAW-IP without MAC-Header */
1806                         olp->huptimer = 0;
1807                         lp->huptimer = 0;
1808                         skb->protocol = htons(ETH_P_IP);
1809                         break;
1810                 case ISDN_NET_ENCAP_CISCOHDLCK:
1811                         isdn_net_ciscohdlck_receive(lp, skb);
1812                         return;
1813                 case ISDN_NET_ENCAP_CISCOHDLC:
1814                         /* CISCO-HDLC IP with type field and  fake I-frame-header */
1815                         skb_pull(skb, 2);
1816                         /* Fall through */
1817                 case ISDN_NET_ENCAP_IPTYP:
1818                         /* IP with type field */
1819                         olp->huptimer = 0;
1820                         lp->huptimer = 0;
1821                         skb->protocol = *(__be16 *)&(skb->data[0]);
1822                         skb_pull(skb, 2);
1823                         if (*(unsigned short *) skb->data == 0xFFFF)
1824                                 skb->protocol = htons(ETH_P_802_3);
1825                         break;
1826 #ifdef CONFIG_ISDN_PPP
1827                 case ISDN_NET_ENCAP_SYNCPPP:
1828                         /* huptimer is done in isdn_ppp_push_higher */
1829                         isdn_ppp_receive(lp->netdev, olp, skb);
1830                         return;
1831 #endif
1832
1833                 default:
1834 #ifdef CONFIG_ISDN_X25
1835                   /* try if there are generic sync_device receiver routines */
1836                         if(cprot) if(cprot -> pops)
1837                                 if( cprot -> pops -> data_ind){
1838                                         cprot -> pops -> data_ind(cprot,skb);
1839                                         return;
1840                                 };
1841 #endif /* CONFIG_ISDN_X25 */
1842                         printk(KERN_WARNING "%s: unknown encapsulation, dropping\n",
1843                                lp->netdev->dev->name);
1844                         kfree_skb(skb);
1845                         return;
1846         }
1847
1848         netif_rx(skb);
1849         return;
1850 }
1851
1852 /*
1853  * A packet arrived via ISDN. Search interface-chain for a corresponding
1854  * interface. If found, deliver packet to receiver-function and return 1,
1855  * else return 0.
1856  */
1857 int
1858 isdn_net_rcv_skb(int idx, struct sk_buff *skb)
1859 {
1860         isdn_net_dev *p = dev->rx_netdev[idx];
1861
1862         if (p) {
1863                 isdn_net_local *lp = p->local;
1864                 if ((lp->flags & ISDN_NET_CONNECTED) &&
1865                     (!lp->dialstate)) {
1866                         isdn_net_receive(p->dev, skb);
1867                         return 1;
1868                 }
1869         }
1870         return 0;
1871 }
1872
1873 /*
1874  *  build an header
1875  *  depends on encaps that is being used.
1876  */
1877
1878 static int isdn_net_header(struct sk_buff *skb, struct net_device *dev,
1879                            unsigned short type,
1880                            const void *daddr, const void *saddr, unsigned plen)
1881 {
1882         isdn_net_local *lp = netdev_priv(dev);
1883         unsigned char *p;
1884         ushort len = 0;
1885
1886         switch (lp->p_encap) {
1887                 case ISDN_NET_ENCAP_ETHER:
1888                         len = eth_header(skb, dev, type, daddr, saddr, plen);
1889                         break;
1890 #ifdef CONFIG_ISDN_PPP
1891                 case ISDN_NET_ENCAP_SYNCPPP:
1892                         /* stick on a fake header to keep fragmentation code happy. */
1893                         len = IPPP_MAX_HEADER;
1894                         skb_push(skb,len);
1895                         break;
1896 #endif
1897                 case ISDN_NET_ENCAP_RAWIP:
1898                         printk(KERN_WARNING "isdn_net_header called with RAW_IP!\n");
1899                         len = 0;
1900                         break;
1901                 case ISDN_NET_ENCAP_IPTYP:
1902                         /* ethernet type field */
1903                         *((__be16 *)skb_push(skb, 2)) = htons(type);
1904                         len = 2;
1905                         break;
1906                 case ISDN_NET_ENCAP_UIHDLC:
1907                         /* HDLC with UI-Frames (for ispa with -h1 option) */
1908                         *((__be16 *)skb_push(skb, 2)) = htons(0x0103);
1909                         len = 2;
1910                         break;
1911                 case ISDN_NET_ENCAP_CISCOHDLC:
1912                 case ISDN_NET_ENCAP_CISCOHDLCK:
1913                         p = skb_push(skb, 4);
1914                         *(u8 *)(p + 0) = CISCO_ADDR_UNICAST;
1915                         *(u8 *)(p + 1) = CISCO_CTRL;
1916                         *(__be16 *)(p + 2) = cpu_to_be16(type);
1917                         p += 4;
1918                         len = 4;
1919                         break;
1920 #ifdef CONFIG_ISDN_X25
1921                 default:
1922                   /* try if there are generic concap protocol routines */
1923                         if( lp-> netdev -> cprot ){
1924                                 printk(KERN_WARNING "isdn_net_header called with concap_proto!\n");
1925                                 len = 0;
1926                                 break;
1927                         }
1928                         break;
1929 #endif /* CONFIG_ISDN_X25 */
1930         }
1931         return len;
1932 }
1933
1934 /* We don't need to send arp, because we have point-to-point connections. */
1935 static int
1936 isdn_net_rebuild_header(struct sk_buff *skb)
1937 {
1938         struct net_device *dev = skb->dev;
1939         isdn_net_local *lp = netdev_priv(dev);
1940         int ret = 0;
1941
1942         if (lp->p_encap == ISDN_NET_ENCAP_ETHER) {
1943                 struct ethhdr *eth = (struct ethhdr *) skb->data;
1944
1945                 /*
1946                  *      Only ARP/IP is currently supported
1947                  */
1948
1949                 if (eth->h_proto != htons(ETH_P_IP)) {
1950                         printk(KERN_WARNING
1951                                "isdn_net: %s don't know how to resolve type %d addresses?\n",
1952                                dev->name, (int) eth->h_proto);
1953                         memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
1954                         return 0;
1955                 }
1956                 /*
1957                  *      Try to get ARP to resolve the header.
1958                  */
1959 #ifdef CONFIG_INET
1960                 ret = arp_find(eth->h_dest, skb);
1961 #endif
1962         }
1963         return ret;
1964 }
1965
1966 static int isdn_header_cache(const struct neighbour *neigh, struct hh_cache *hh)
1967 {
1968         const struct net_device *dev = neigh->dev;
1969         isdn_net_local *lp = netdev_priv(dev);
1970
1971         if (lp->p_encap == ISDN_NET_ENCAP_ETHER)
1972                 return eth_header_cache(neigh, hh);
1973         return -1;
1974 }
1975
1976 static void isdn_header_cache_update(struct hh_cache *hh,
1977                                      const struct net_device *dev,
1978                                      const unsigned char *haddr)
1979 {
1980         isdn_net_local *lp = netdev_priv(dev);
1981         if (lp->p_encap == ISDN_NET_ENCAP_ETHER)
1982                 eth_header_cache_update(hh, dev, haddr);
1983 }
1984
1985 static const struct header_ops isdn_header_ops = {
1986         .create = isdn_net_header,
1987         .rebuild = isdn_net_rebuild_header,
1988         .cache = isdn_header_cache,
1989         .cache_update = isdn_header_cache_update,
1990 };
1991
1992 /*
1993  * Interface-setup. (just after registering a new interface)
1994  */
1995 static int
1996 isdn_net_init(struct net_device *ndev)
1997 {
1998         ushort max_hlhdr_len = 0;
1999         int drvidx;
2000
2001         ether_setup(ndev);
2002         ndev->header_ops = NULL;
2003
2004         /* Setup the generic properties */
2005         ndev->mtu = 1500;
2006         ndev->flags = IFF_NOARP|IFF_POINTOPOINT;
2007         ndev->type = ARPHRD_ETHER;
2008         ndev->addr_len = ETH_ALEN;
2009         ndev->validate_addr = NULL;
2010
2011         /* for clients with MPPP maybe higher values better */
2012         ndev->tx_queue_len = 30;
2013
2014         /* The ISDN-specific entries in the device structure. */
2015         ndev->open = &isdn_net_open;
2016         ndev->hard_start_xmit = &isdn_net_start_xmit;
2017
2018         /*
2019          *  up till binding we ask the protocol layer to reserve as much
2020          *  as we might need for HL layer
2021          */
2022
2023         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
2024                 if (dev->drv[drvidx])
2025                         if (max_hlhdr_len < dev->drv[drvidx]->interface->hl_hdrlen)
2026                                 max_hlhdr_len = dev->drv[drvidx]->interface->hl_hdrlen;
2027
2028         ndev->hard_header_len = ETH_HLEN + max_hlhdr_len;
2029         ndev->stop = &isdn_net_close;
2030         ndev->get_stats = &isdn_net_get_stats;
2031         ndev->do_ioctl = NULL;
2032         return 0;
2033 }
2034
2035 static void
2036 isdn_net_swapbind(int drvidx)
2037 {
2038         isdn_net_dev *p;
2039
2040 #ifdef ISDN_DEBUG_NET_ICALL
2041         printk(KERN_DEBUG "n_fi: swapping ch of %d\n", drvidx);
2042 #endif
2043         p = dev->netdev;
2044         while (p) {
2045                 if (p->local->pre_device == drvidx)
2046                         switch (p->local->pre_channel) {
2047                                 case 0:
2048                                         p->local->pre_channel = 1;
2049                                         break;
2050                                 case 1:
2051                                         p->local->pre_channel = 0;
2052                                         break;
2053                         }
2054                 p = (isdn_net_dev *) p->next;
2055         }
2056 }
2057
2058 static void
2059 isdn_net_swap_usage(int i1, int i2)
2060 {
2061         int u1 = dev->usage[i1] & ISDN_USAGE_EXCLUSIVE;
2062         int u2 = dev->usage[i2] & ISDN_USAGE_EXCLUSIVE;
2063
2064 #ifdef ISDN_DEBUG_NET_ICALL
2065         printk(KERN_DEBUG "n_fi: usage of %d and %d\n", i1, i2);
2066 #endif
2067         dev->usage[i1] &= ~ISDN_USAGE_EXCLUSIVE;
2068         dev->usage[i1] |= u2;
2069         dev->usage[i2] &= ~ISDN_USAGE_EXCLUSIVE;
2070         dev->usage[i2] |= u1;
2071         isdn_info_update();
2072 }
2073
2074 /*
2075  * An incoming call-request has arrived.
2076  * Search the interface-chain for an appropriate interface.
2077  * If found, connect the interface to the ISDN-channel and initiate
2078  * D- and B-Channel-setup. If secure-flag is set, accept only
2079  * configured phone-numbers. If callback-flag is set, initiate
2080  * callback-dialing.
2081  *
2082  * Return-Value: 0 = No appropriate interface for this call.
2083  *               1 = Call accepted
2084  *               2 = Reject call, wait cbdelay, then call back
2085  *               3 = Reject call
2086  *               4 = Wait cbdelay, then call back
2087  *               5 = No appropriate interface for this call,
2088  *                   would eventually match if CID was longer.
2089  */
2090
2091 int
2092 isdn_net_find_icall(int di, int ch, int idx, setup_parm *setup)
2093 {
2094         char *eaz;
2095         int si1;
2096         int si2;
2097         int ematch;
2098         int wret;
2099         int swapped;
2100         int sidx = 0;
2101         u_long flags;
2102         isdn_net_dev *p;
2103         isdn_net_phone *n;
2104         char nr[ISDN_MSNLEN];
2105         char *my_eaz;
2106
2107         /* Search name in netdev-chain */
2108         if (!setup->phone[0]) {
2109                 nr[0] = '0';
2110                 nr[1] = '\0';
2111                 printk(KERN_INFO "isdn_net: Incoming call without OAD, assuming '0'\n");
2112         } else
2113                 strlcpy(nr, setup->phone, ISDN_MSNLEN);
2114         si1 = (int) setup->si1;
2115         si2 = (int) setup->si2;
2116         if (!setup->eazmsn[0]) {
2117                 printk(KERN_WARNING "isdn_net: Incoming call without CPN, assuming '0'\n");
2118                 eaz = "0";
2119         } else
2120                 eaz = setup->eazmsn;
2121         if (dev->net_verbose > 1)
2122                 printk(KERN_INFO "isdn_net: call from %s,%d,%d -> %s\n", nr, si1, si2, eaz);
2123         /* Accept DATA and VOICE calls at this stage
2124          * local eaz is checked later for allowed call types
2125          */
2126         if ((si1 != 7) && (si1 != 1)) {
2127                 if (dev->net_verbose > 1)
2128                         printk(KERN_INFO "isdn_net: Service-Indicator not 1 or 7, ignored\n");
2129                 return 0;
2130         }
2131         n = (isdn_net_phone *) 0;
2132         p = dev->netdev;
2133         ematch = wret = swapped = 0;
2134 #ifdef ISDN_DEBUG_NET_ICALL
2135         printk(KERN_DEBUG "n_fi: di=%d ch=%d idx=%d usg=%d\n", di, ch, idx,
2136                 dev->usage[idx]);
2137 #endif
2138         while (p) {
2139                 int matchret;
2140                 isdn_net_local *lp = p->local;
2141
2142                 /* If last check has triggered as binding-swap, revert it */
2143                 switch (swapped) {
2144                         case 2:
2145                                 isdn_net_swap_usage(idx, sidx);
2146                                 /* fall through */
2147                         case 1:
2148                                 isdn_net_swapbind(di);
2149                                 break;
2150                 }
2151                 swapped = 0;
2152                 /* check acceptable call types for DOV */
2153                 my_eaz = isdn_map_eaz2msn(lp->msn, di);
2154                 if (si1 == 1) { /* it's a DOV call, check if we allow it */
2155                         if (*my_eaz == 'v' || *my_eaz == 'V' ||
2156                             *my_eaz == 'b' || *my_eaz == 'B')
2157                                 my_eaz++; /* skip to allow a match */
2158                         else
2159                                 my_eaz = NULL; /* force non match */
2160                 } else { /* it's a DATA call, check if we allow it */
2161                         if (*my_eaz == 'b' || *my_eaz == 'B')
2162                                 my_eaz++; /* skip to allow a match */
2163                 }
2164                 if (my_eaz)
2165                         matchret = isdn_msncmp(eaz, my_eaz);
2166                 else
2167                         matchret = 1;
2168                 if (!matchret)
2169                         ematch = 1;
2170
2171                 /* Remember if more numbers eventually can match */
2172                 if (matchret > wret)
2173                         wret = matchret;
2174 #ifdef ISDN_DEBUG_NET_ICALL
2175                 printk(KERN_DEBUG "n_fi: if='%s', l.msn=%s, l.flags=%d, l.dstate=%d\n",
2176                        p->dev->name, lp->msn, lp->flags, lp->dialstate);
2177 #endif
2178                 if ((!matchret) &&                                        /* EAZ is matching   */
2179                     (((!(lp->flags & ISDN_NET_CONNECTED)) &&              /* but not connected */
2180                       (USG_NONE(dev->usage[idx]))) ||                     /* and ch. unused or */
2181                      ((((lp->dialstate == 4) || (lp->dialstate == 12)) && /* if dialing        */
2182                        (!(lp->flags & ISDN_NET_CALLBACK)))                /* but no callback   */
2183                      )))
2184                          {
2185 #ifdef ISDN_DEBUG_NET_ICALL
2186                         printk(KERN_DEBUG "n_fi: match1, pdev=%d pch=%d\n",
2187                                lp->pre_device, lp->pre_channel);
2188 #endif
2189                         if (dev->usage[idx] & ISDN_USAGE_EXCLUSIVE) {
2190                                 if ((lp->pre_channel != ch) ||
2191                                     (lp->pre_device != di)) {
2192                                         /* Here we got a problem:
2193                                          * If using an ICN-Card, an incoming call is always signaled on
2194                                          * on the first channel of the card, if both channels are
2195                                          * down. However this channel may be bound exclusive. If the
2196                                          * second channel is free, this call should be accepted.
2197                                          * The solution is horribly but it runs, so what:
2198                                          * We exchange the exclusive bindings of the two channels, the
2199                                          * corresponding variables in the interface-structs.
2200                                          */
2201                                         if (ch == 0) {
2202                                                 sidx = isdn_dc2minor(di, 1);
2203 #ifdef ISDN_DEBUG_NET_ICALL
2204                                                 printk(KERN_DEBUG "n_fi: ch is 0\n");
2205 #endif
2206                                                 if (USG_NONE(dev->usage[sidx])) {
2207                                                         /* Second Channel is free, now see if it is bound
2208                                                          * exclusive too. */
2209                                                         if (dev->usage[sidx] & ISDN_USAGE_EXCLUSIVE) {
2210 #ifdef ISDN_DEBUG_NET_ICALL
2211                                                                 printk(KERN_DEBUG "n_fi: 2nd channel is down and bound\n");
2212 #endif
2213                                                                 /* Yes, swap bindings only, if the original
2214                                                                  * binding is bound to channel 1 of this driver */
2215                                                                 if ((lp->pre_device == di) &&
2216                                                                     (lp->pre_channel == 1)) {
2217                                                                         isdn_net_swapbind(di);
2218                                                                         swapped = 1;
2219                                                                 } else {
2220                                                                         /* ... else iterate next device */
2221                                                                         p = (isdn_net_dev *) p->next;
2222                                                                         continue;
2223                                                                 }
2224                                                         } else {
2225 #ifdef ISDN_DEBUG_NET_ICALL
2226                                                                 printk(KERN_DEBUG "n_fi: 2nd channel is down and unbound\n");
2227 #endif
2228                                                                 /* No, swap always and swap excl-usage also */
2229                                                                 isdn_net_swap_usage(idx, sidx);
2230                                                                 isdn_net_swapbind(di);
2231                                                                 swapped = 2;
2232                                                         }
2233                                                         /* Now check for exclusive binding again */
2234 #ifdef ISDN_DEBUG_NET_ICALL
2235                                                         printk(KERN_DEBUG "n_fi: final check\n");
2236 #endif
2237                                                         if ((dev->usage[idx] & ISDN_USAGE_EXCLUSIVE) &&
2238                                                             ((lp->pre_channel != ch) ||
2239                                                              (lp->pre_device != di))) {
2240 #ifdef ISDN_DEBUG_NET_ICALL
2241                                                                 printk(KERN_DEBUG "n_fi: final check failed\n");
2242 #endif
2243                                                                 p = (isdn_net_dev *) p->next;
2244                                                                 continue;
2245                                                         }
2246                                                 }
2247                                         } else {
2248                                                 /* We are already on the second channel, so nothing to do */
2249 #ifdef ISDN_DEBUG_NET_ICALL
2250                                                 printk(KERN_DEBUG "n_fi: already on 2nd channel\n");
2251 #endif
2252                                         }
2253                                 }
2254                         }
2255 #ifdef ISDN_DEBUG_NET_ICALL
2256                         printk(KERN_DEBUG "n_fi: match2\n");
2257 #endif
2258                         n = lp->phone[0];
2259                         if (lp->flags & ISDN_NET_SECURE) {
2260                                 while (n) {
2261                                         if (!isdn_msncmp(nr, n->num))
2262                                                 break;
2263                                         n = (isdn_net_phone *) n->next;
2264                                 }
2265                         }
2266                         if (n || (!(lp->flags & ISDN_NET_SECURE))) {
2267 #ifdef ISDN_DEBUG_NET_ICALL
2268                                 printk(KERN_DEBUG "n_fi: match3\n");
2269 #endif
2270                                 /* matching interface found */
2271
2272                                 /*
2273                                  * Is the state STOPPED?
2274                                  * If so, no dialin is allowed,
2275                                  * so reject actively.
2276                                  * */
2277                                 if (ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_OFF) {
2278                                         printk(KERN_INFO "incoming call, interface %s `stopped' -> rejected\n",
2279                                                p->dev->name);
2280                                         return 3;
2281                                 }
2282                                 /*
2283                                  * Is the interface up?
2284                                  * If not, reject the call actively.
2285                                  */
2286                                 if (!isdn_net_device_started(p)) {
2287                                         printk(KERN_INFO "%s: incoming call, interface down -> rejected\n",
2288                                                p->dev->name);
2289                                         return 3;
2290                                 }
2291                                 /* Interface is up, now see if it's a slave. If so, see if
2292                                  * it's master and parent slave is online. If not, reject the call.
2293                                  */
2294                                 if (lp->master) {
2295                                         isdn_net_local *mlp = ISDN_MASTER_PRIV(lp);
2296                                         printk(KERN_DEBUG "ICALLslv: %s\n", p->dev->name);
2297                                         printk(KERN_DEBUG "master=%s\n", lp->master->name);
2298                                         if (mlp->flags & ISDN_NET_CONNECTED) {
2299                                                 printk(KERN_DEBUG "master online\n");
2300                                                 /* Master is online, find parent-slave (master if first slave) */
2301                                                 while (mlp->slave) {
2302                                                         if (ISDN_SLAVE_PRIV(mlp) == lp)
2303                                                                 break;
2304                                                         mlp = ISDN_SLAVE_PRIV(mlp);
2305                                                 }
2306                                         } else
2307                                                 printk(KERN_DEBUG "master offline\n");
2308                                         /* Found parent, if it's offline iterate next device */
2309                                         printk(KERN_DEBUG "mlpf: %d\n", mlp->flags & ISDN_NET_CONNECTED);
2310                                         if (!(mlp->flags & ISDN_NET_CONNECTED)) {
2311                                                 p = (isdn_net_dev *) p->next;
2312                                                 continue;
2313                                         }
2314                                 } 
2315                                 if (lp->flags & ISDN_NET_CALLBACK) {
2316                                         int chi;
2317                                         /*
2318                                          * Is the state MANUAL?
2319                                          * If so, no callback can be made,
2320                                          * so reject actively.
2321                                          * */
2322                                         if (ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_OFF) {
2323                                                 printk(KERN_INFO "incoming call for callback, interface %s `off' -> rejected\n",
2324                                                        p->dev->name);
2325                                                 return 3;
2326                                         }
2327                                         printk(KERN_DEBUG "%s: call from %s -> %s, start callback\n",
2328                                                p->dev->name, nr, eaz);
2329                                         if (lp->phone[1]) {
2330                                                 /* Grab a free ISDN-Channel */
2331                                                 spin_lock_irqsave(&dev->lock, flags);
2332                                                 if ((chi = 
2333                                                         isdn_get_free_channel(
2334                                                                 ISDN_USAGE_NET,
2335                                                                 lp->l2_proto,
2336                                                                 lp->l3_proto,
2337                                                                 lp->pre_device,
2338                                                                 lp->pre_channel,
2339                                                                 lp->msn)
2340                                                                 ) < 0) {
2341
2342                                                         printk(KERN_WARNING "isdn_net_find_icall: No channel for %s\n",
2343                                                                 p->dev->name);
2344                                                         spin_unlock_irqrestore(&dev->lock, flags);
2345                                                         return 0;
2346                                                 }
2347                                                 /* Setup dialstate. */
2348                                                 lp->dtimer = 0;
2349                                                 lp->dialstate = 11;
2350                                                 /* Connect interface with channel */
2351                                                 isdn_net_bind_channel(lp, chi);
2352 #ifdef CONFIG_ISDN_PPP
2353                                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
2354                                                         if (isdn_ppp_bind(lp) < 0) {
2355                                                                 spin_unlock_irqrestore(&dev->lock, flags);
2356                                                                 isdn_net_unbind_channel(lp);
2357                                                                 return 0;
2358                                                         }
2359 #endif
2360                                                 spin_unlock_irqrestore(&dev->lock, flags);
2361                                                 /* Initiate dialing by returning 2 or 4 */
2362                                                 return (lp->flags & ISDN_NET_CBHUP) ? 2 : 4;
2363                                         } else
2364                                                 printk(KERN_WARNING "isdn_net: %s: No phone number\n",
2365                                                         p->dev->name);
2366                                         return 0;
2367                                 } else {
2368                                         printk(KERN_DEBUG "%s: call from %s -> %s accepted\n",
2369                                                 p->dev->name, nr, eaz);
2370                                         /* if this interface is dialing, it does it probably on a different
2371                                            device, so free this device */
2372                                         if ((lp->dialstate == 4) || (lp->dialstate == 12)) {
2373 #ifdef CONFIG_ISDN_PPP
2374                                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
2375                                                         isdn_ppp_free(lp);
2376 #endif
2377                                                 isdn_net_lp_disconnected(lp);
2378                                                 isdn_free_channel(lp->isdn_device, lp->isdn_channel,
2379                                                          ISDN_USAGE_NET);
2380                                         }
2381                                         spin_lock_irqsave(&dev->lock, flags);
2382                                         dev->usage[idx] &= ISDN_USAGE_EXCLUSIVE;
2383                                         dev->usage[idx] |= ISDN_USAGE_NET;
2384                                         strcpy(dev->num[idx], nr);
2385                                         isdn_info_update();
2386                                         dev->st_netdev[idx] = lp->netdev;
2387                                         lp->isdn_device = di;
2388                                         lp->isdn_channel = ch;
2389                                         lp->ppp_slot = -1;
2390                                         lp->flags |= ISDN_NET_CONNECTED;
2391                                         lp->dialstate = 7;
2392                                         lp->dtimer = 0;
2393                                         lp->outgoing = 0;
2394                                         lp->huptimer = 0;
2395                                         lp->hupflags |= ISDN_WAITCHARGE;
2396                                         lp->hupflags &= ~ISDN_HAVECHARGE;
2397 #ifdef CONFIG_ISDN_PPP
2398                                         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
2399                                                 if (isdn_ppp_bind(lp) < 0) {
2400                                                         isdn_net_unbind_channel(lp);
2401                                                         spin_unlock_irqrestore(&dev->lock, flags);
2402                                                         return 0;
2403                                                 }
2404                                         }
2405 #endif
2406                                         spin_unlock_irqrestore(&dev->lock, flags);
2407                                         return 1;
2408                                 }
2409                         }
2410                 }
2411                 p = (isdn_net_dev *) p->next;
2412         }
2413         /* If none of configured EAZ/MSN matched and not verbose, be silent */
2414         if (!ematch || dev->net_verbose)
2415                 printk(KERN_INFO "isdn_net: call from %s -> %d %s ignored\n", nr, di, eaz);
2416         return (wret == 2)?5:0;
2417 }
2418
2419 /*
2420  * Search list of net-interfaces for an interface with given name.
2421  */
2422 isdn_net_dev *
2423 isdn_net_findif(char *name)
2424 {
2425         isdn_net_dev *p = dev->netdev;
2426
2427         while (p) {
2428                 if (!strcmp(p->dev->name, name))
2429                         return p;
2430                 p = (isdn_net_dev *) p->next;
2431         }
2432         return (isdn_net_dev *) NULL;
2433 }
2434
2435 /*
2436  * Force a net-interface to dial out.
2437  * This is called from the userlevel-routine below or
2438  * from isdn_net_start_xmit().
2439  */
2440 static int
2441 isdn_net_force_dial_lp(isdn_net_local * lp)
2442 {
2443         if ((!(lp->flags & ISDN_NET_CONNECTED)) && !lp->dialstate) {
2444                 int chi;
2445                 if (lp->phone[1]) {
2446                         ulong flags;
2447
2448                         /* Grab a free ISDN-Channel */
2449                         spin_lock_irqsave(&dev->lock, flags);
2450                         if ((chi = isdn_get_free_channel(
2451                                         ISDN_USAGE_NET,
2452                                         lp->l2_proto,
2453                                         lp->l3_proto,
2454                                         lp->pre_device,
2455                                         lp->pre_channel,
2456                                         lp->msn)) < 0) {
2457                                 printk(KERN_WARNING "isdn_net_force_dial: No channel for %s\n",
2458                                         lp->netdev->dev->name);
2459                                 spin_unlock_irqrestore(&dev->lock, flags);
2460                                 return -EAGAIN;
2461                         }
2462                         lp->dialstate = 1;
2463                         /* Connect interface with channel */
2464                         isdn_net_bind_channel(lp, chi);
2465 #ifdef CONFIG_ISDN_PPP
2466                         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
2467                                 if (isdn_ppp_bind(lp) < 0) {
2468                                         isdn_net_unbind_channel(lp);
2469                                         spin_unlock_irqrestore(&dev->lock, flags);
2470                                         return -EAGAIN;
2471                                 }
2472 #endif
2473                         /* Initiate dialing */
2474                         spin_unlock_irqrestore(&dev->lock, flags);
2475                         isdn_net_dial();
2476                         return 0;
2477                 } else
2478                         return -EINVAL;
2479         } else
2480                 return -EBUSY;
2481 }
2482
2483 /*
2484  * This is called from certain upper protocol layers (multilink ppp
2485  * and x25iface encapsulation module) that want to initiate dialing
2486  * themselves.
2487  */
2488 int
2489 isdn_net_dial_req(isdn_net_local * lp)
2490 {
2491         /* is there a better error code? */
2492         if (!(ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_AUTO)) return -EBUSY;
2493
2494         return isdn_net_force_dial_lp(lp);
2495 }
2496
2497 /*
2498  * Force a net-interface to dial out.
2499  * This is always called from within userspace (ISDN_IOCTL_NET_DIAL).
2500  */
2501 int
2502 isdn_net_force_dial(char *name)
2503 {
2504         isdn_net_dev *p = isdn_net_findif(name);
2505
2506         if (!p)
2507                 return -ENODEV;
2508         return (isdn_net_force_dial_lp(p->local));
2509 }
2510
2511 /*
2512  * Helper for alloc_netdev()
2513  */
2514 static void _isdn_setup(struct net_device *dev)
2515 {
2516         isdn_net_local *lp = netdev_priv(dev);
2517
2518         dev->flags = IFF_NOARP | IFF_POINTOPOINT;
2519         lp->p_encap = ISDN_NET_ENCAP_RAWIP;
2520         lp->magic = ISDN_NET_MAGIC;
2521         lp->last = lp;
2522         lp->next = lp;
2523         lp->isdn_device = -1;
2524         lp->isdn_channel = -1;
2525         lp->pre_device = -1;
2526         lp->pre_channel = -1;
2527         lp->exclusive = -1;
2528         lp->ppp_slot = -1;
2529         lp->pppbind = -1;
2530         skb_queue_head_init(&lp->super_tx_queue);
2531         lp->l2_proto = ISDN_PROTO_L2_X75I;
2532         lp->l3_proto = ISDN_PROTO_L3_TRANS;
2533         lp->triggercps = 6000;
2534         lp->slavedelay = 10 * HZ;
2535         lp->hupflags = ISDN_INHUP;      /* Do hangup even on incoming calls */
2536         lp->onhtime = 10;       /* Default hangup-time for saving costs */
2537         lp->dialmax = 1;
2538         /* Hangup before Callback, manual dial */
2539         lp->flags = ISDN_NET_CBHUP | ISDN_NET_DM_MANUAL;
2540         lp->cbdelay = 25;       /* Wait 5 secs before Callback */
2541         lp->dialtimeout = -1;  /* Infinite Dial-Timeout */
2542         lp->dialwait = 5 * HZ; /* Wait 5 sec. after failed dial */
2543         lp->dialstarted = 0;   /* Jiffies of last dial-start */
2544         lp->dialwait_timer = 0;  /* Jiffies of earliest next dial-start */
2545 }
2546
2547 /*
2548  * Allocate a new network-interface and initialize its data structures.
2549  */
2550 char *
2551 isdn_net_new(char *name, struct net_device *master)
2552 {
2553         isdn_net_dev *netdev;
2554
2555         /* Avoid creating an existing interface */
2556         if (isdn_net_findif(name)) {
2557                 printk(KERN_WARNING "isdn_net: interface %s already exists\n", name);
2558                 return NULL;
2559         }
2560         if (name == NULL)
2561                 return NULL;
2562         if (!(netdev = kzalloc(sizeof(isdn_net_dev), GFP_KERNEL))) {
2563                 printk(KERN_WARNING "isdn_net: Could not allocate net-device\n");
2564                 return NULL;
2565         }
2566         netdev->dev = alloc_netdev(sizeof(isdn_net_local), name, _isdn_setup);
2567         if (!netdev->dev) {
2568                 printk(KERN_WARNING "isdn_net: Could not allocate network device\n");
2569                 kfree(netdev);
2570                 return NULL;
2571         }
2572         netdev->local = netdev_priv(netdev->dev);
2573         netdev->dev->init = isdn_net_init;
2574         if (master) {
2575                 /* Device shall be a slave */
2576                 struct net_device *p = MASTER_TO_SLAVE(master);
2577                 struct net_device *q = master;
2578
2579                 netdev->local->master = master;
2580                 /* Put device at end of slave-chain */
2581                 while (p) {
2582                         q = p;
2583                         p = MASTER_TO_SLAVE(p);
2584                 }
2585                 MASTER_TO_SLAVE(q) = netdev->dev;
2586         } else {
2587                 /* Device shall be a master */
2588                 /*
2589                  * Watchdog timer (currently) for master only.
2590                  */
2591                 netdev->dev->tx_timeout = isdn_net_tx_timeout;
2592                 netdev->dev->watchdog_timeo = ISDN_NET_TX_TIMEOUT;
2593                 if (register_netdev(netdev->dev) != 0) {
2594                         printk(KERN_WARNING "isdn_net: Could not register net-device\n");
2595                         free_netdev(netdev->dev);
2596                         kfree(netdev);
2597                         return NULL;
2598                 }
2599         }
2600         netdev->queue = netdev->local;
2601         spin_lock_init(&netdev->queue_lock);
2602
2603         netdev->local->netdev = netdev;
2604
2605         INIT_WORK(&netdev->local->tqueue, isdn_net_softint);
2606         spin_lock_init(&netdev->local->xmit_lock);
2607
2608         /* Put into to netdev-chain */
2609         netdev->next = (void *) dev->netdev;
2610         dev->netdev = netdev;
2611         return netdev->dev->name;
2612 }
2613
2614 char *
2615 isdn_net_newslave(char *parm)
2616 {
2617         char *p = strchr(parm, ',');
2618         isdn_net_dev *n;
2619         char newname[10];
2620
2621         if (p) {
2622                 /* Slave-Name MUST not be empty */
2623                 if (!strlen(p + 1))
2624                         return NULL;
2625                 strcpy(newname, p + 1);
2626                 *p = 0;
2627                 /* Master must already exist */
2628                 if (!(n = isdn_net_findif(parm)))
2629                         return NULL;
2630                 /* Master must be a real interface, not a slave */
2631                 if (n->local->master)
2632                         return NULL;
2633                 /* Master must not be started yet */
2634                 if (isdn_net_device_started(n)) 
2635                         return NULL;
2636                 return (isdn_net_new(newname, n->dev));
2637         }
2638         return NULL;
2639 }
2640
2641 /*
2642  * Set interface-parameters.
2643  * Always set all parameters, so the user-level application is responsible
2644  * for not overwriting existing setups. It has to get the current
2645  * setup first, if only selected parameters are to be changed.
2646  */
2647 int
2648 isdn_net_setcfg(isdn_net_ioctl_cfg * cfg)
2649 {
2650         isdn_net_dev *p = isdn_net_findif(cfg->name);
2651         ulong features;
2652         int i;
2653         int drvidx;
2654         int chidx;
2655         char drvid[25];
2656
2657         if (p) {
2658                 isdn_net_local *lp = p->local;
2659
2660                 /* See if any registered driver supports the features we want */
2661                 features = ((1 << cfg->l2_proto) << ISDN_FEATURE_L2_SHIFT) |
2662                         ((1 << cfg->l3_proto) << ISDN_FEATURE_L3_SHIFT);
2663                 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2664                         if (dev->drv[i])
2665                                 if ((dev->drv[i]->interface->features & features) == features)
2666                                         break;
2667                 if (i == ISDN_MAX_DRIVERS) {
2668                         printk(KERN_WARNING "isdn_net: No driver with selected features\n");
2669                         return -ENODEV;
2670                 }
2671                 if (lp->p_encap != cfg->p_encap){
2672 #ifdef CONFIG_ISDN_X25
2673                         struct concap_proto * cprot = p -> cprot;
2674 #endif
2675                         if (isdn_net_device_started(p)) {
2676                                 printk(KERN_WARNING "%s: cannot change encap when if is up\n",
2677                                        p->dev->name);
2678                                 return -EBUSY;
2679                         }
2680 #ifdef CONFIG_ISDN_X25
2681                         if( cprot && cprot -> pops )
2682                                 cprot -> pops -> proto_del ( cprot );
2683                         p -> cprot = NULL;
2684                         lp -> dops = NULL;
2685                         /* ... ,  prepare for configuration of new one ... */
2686                         switch ( cfg -> p_encap ){
2687                         case ISDN_NET_ENCAP_X25IFACE:
2688                                 lp -> dops = &isdn_concap_reliable_dl_dops;
2689                         }
2690                         /* ... and allocate new one ... */
2691                         p -> cprot = isdn_concap_new( cfg -> p_encap );
2692                         /* p -> cprot == NULL now if p_encap is not supported
2693                            by means of the concap_proto mechanism */
2694                         /* the protocol is not configured yet; this will
2695                            happen later when isdn_net_reset() is called */
2696 #endif
2697                 }
2698                 switch ( cfg->p_encap ) {
2699                 case ISDN_NET_ENCAP_SYNCPPP:
2700 #ifndef CONFIG_ISDN_PPP
2701                         printk(KERN_WARNING "%s: SyncPPP support not configured\n",
2702                                p->dev->name);
2703                         return -EINVAL;
2704 #else
2705                         p->dev->type = ARPHRD_PPP;      /* change ARP type */
2706                         p->dev->addr_len = 0;
2707                         p->dev->do_ioctl = isdn_ppp_dev_ioctl;
2708 #endif
2709                         break;
2710                 case ISDN_NET_ENCAP_X25IFACE:
2711 #ifndef CONFIG_ISDN_X25
2712                         printk(KERN_WARNING "%s: isdn-x25 support not configured\n",
2713                                p->dev->name);
2714                         return -EINVAL;
2715 #else
2716                         p->dev->type = ARPHRD_X25;      /* change ARP type */
2717                         p->dev->addr_len = 0;
2718 #endif
2719                         break;
2720                 case ISDN_NET_ENCAP_CISCOHDLCK:
2721                         p->dev->do_ioctl = isdn_ciscohdlck_dev_ioctl;
2722                         break;
2723                 default:
2724                         if( cfg->p_encap >= 0 &&
2725                             cfg->p_encap <= ISDN_NET_ENCAP_MAX_ENCAP )
2726                                 break;
2727                         printk(KERN_WARNING
2728                                "%s: encapsulation protocol %d not supported\n",
2729                                p->dev->name, cfg->p_encap);
2730                         return -EINVAL;
2731                 }
2732                 if (strlen(cfg->drvid)) {
2733                         /* A bind has been requested ... */
2734                         char *c,
2735                         *e;
2736
2737                         drvidx = -1;
2738                         chidx = -1;
2739                         strcpy(drvid, cfg->drvid);
2740                         if ((c = strchr(drvid, ','))) {
2741                                 /* The channel-number is appended to the driver-Id with a comma */
2742                                 chidx = (int) simple_strtoul(c + 1, &e, 10);
2743                                 if (e == c)
2744                                         chidx = -1;
2745                                 *c = '\0';
2746                         }
2747                         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2748                                 /* Lookup driver-Id in array */
2749                                 if (!(strcmp(dev->drvid[i], drvid))) {
2750                                         drvidx = i;
2751                                         break;
2752                                 }
2753                         if ((drvidx == -1) || (chidx == -1))
2754                                 /* Either driver-Id or channel-number invalid */
2755                                 return -ENODEV;
2756                 } else {
2757                         /* Parameters are valid, so get them */
2758                         drvidx = lp->pre_device;
2759                         chidx = lp->pre_channel;
2760                 }
2761                 if (cfg->exclusive > 0) {
2762                         unsigned long flags;
2763
2764                         /* If binding is exclusive, try to grab the channel */
2765                         spin_lock_irqsave(&dev->lock, flags);
2766                         if ((i = isdn_get_free_channel(ISDN_USAGE_NET,
2767                                 lp->l2_proto, lp->l3_proto, drvidx,
2768                                 chidx, lp->msn)) < 0) {
2769                                 /* Grab failed, because desired channel is in use */
2770                                 lp->exclusive = -1;
2771                                 spin_unlock_irqrestore(&dev->lock, flags);
2772                                 return -EBUSY;
2773                         }
2774                         /* All went ok, so update isdninfo */
2775                         dev->usage[i] = ISDN_USAGE_EXCLUSIVE;
2776                         isdn_info_update();
2777                         spin_unlock_irqrestore(&dev->lock, flags);
2778                         lp->exclusive = i;
2779                 } else {
2780                         /* Non-exclusive binding or unbind. */
2781                         lp->exclusive = -1;
2782                         if ((lp->pre_device != -1) && (cfg->exclusive == -1)) {
2783                                 isdn_unexclusive_channel(lp->pre_device, lp->pre_channel);
2784                                 isdn_free_channel(lp->pre_device, lp->pre_channel, ISDN_USAGE_NET);
2785                                 drvidx = -1;
2786                                 chidx = -1;
2787                         }
2788                 }
2789                 strlcpy(lp->msn, cfg->eaz, sizeof(lp->msn));
2790                 lp->pre_device = drvidx;
2791                 lp->pre_channel = chidx;
2792                 lp->onhtime = cfg->onhtime;
2793                 lp->charge = cfg->charge;
2794                 lp->l2_proto = cfg->l2_proto;
2795                 lp->l3_proto = cfg->l3_proto;
2796                 lp->cbdelay = cfg->cbdelay;
2797                 lp->dialmax = cfg->dialmax;
2798                 lp->triggercps = cfg->triggercps;
2799                 lp->slavedelay = cfg->slavedelay * HZ;
2800                 lp->pppbind = cfg->pppbind;
2801                 lp->dialtimeout = cfg->dialtimeout >= 0 ? cfg->dialtimeout * HZ : -1;
2802                 lp->dialwait = cfg->dialwait * HZ;
2803                 if (cfg->secure)
2804                         lp->flags |= ISDN_NET_SECURE;
2805                 else
2806                         lp->flags &= ~ISDN_NET_SECURE;
2807                 if (cfg->cbhup)
2808                         lp->flags |= ISDN_NET_CBHUP;
2809                 else
2810                         lp->flags &= ~ISDN_NET_CBHUP;
2811                 switch (cfg->callback) {
2812                         case 0:
2813                                 lp->flags &= ~(ISDN_NET_CALLBACK | ISDN_NET_CBOUT);
2814                                 break;
2815                         case 1:
2816                                 lp->flags |= ISDN_NET_CALLBACK;
2817                                 lp->flags &= ~ISDN_NET_CBOUT;
2818                                 break;
2819                         case 2:
2820                                 lp->flags |= ISDN_NET_CBOUT;
2821                                 lp->flags &= ~ISDN_NET_CALLBACK;
2822                                 break;
2823                 }
2824                 lp->flags &= ~ISDN_NET_DIALMODE_MASK;   /* first all bits off */
2825                 if (cfg->dialmode && !(cfg->dialmode & ISDN_NET_DIALMODE_MASK)) {
2826                         /* old isdnctrl version, where only 0 or 1 is given */
2827                         printk(KERN_WARNING
2828                              "Old isdnctrl version detected! Please update.\n");
2829                         lp->flags |= ISDN_NET_DM_OFF; /* turn on `off' bit */
2830                 }
2831                 else {
2832                         lp->flags |= cfg->dialmode;  /* turn on selected bits */
2833                 }
2834                 if (cfg->chargehup)
2835                         lp->hupflags |= ISDN_CHARGEHUP;
2836                 else
2837                         lp->hupflags &= ~ISDN_CHARGEHUP;
2838                 if (cfg->ihup)
2839                         lp->hupflags |= ISDN_INHUP;
2840                 else
2841                         lp->hupflags &= ~ISDN_INHUP;
2842                 if (cfg->chargeint > 10) {
2843                         lp->hupflags |= ISDN_CHARGEHUP | ISDN_HAVECHARGE | ISDN_MANCHARGE;
2844                         lp->chargeint = cfg->chargeint * HZ;
2845                 }
2846                 if (cfg->p_encap != lp->p_encap) {
2847                         if (cfg->p_encap == ISDN_NET_ENCAP_RAWIP) {
2848                                 p->dev->header_ops = NULL;
2849                                 p->dev->flags = IFF_NOARP|IFF_POINTOPOINT;
2850                         } else {
2851                                 p->dev->header_ops = &isdn_header_ops;
2852                                 if (cfg->p_encap == ISDN_NET_ENCAP_ETHER)
2853                                         p->dev->flags = IFF_BROADCAST | IFF_MULTICAST;
2854                                 else
2855                                         p->dev->flags = IFF_NOARP|IFF_POINTOPOINT;
2856                         }
2857                 }
2858                 lp->p_encap = cfg->p_encap;
2859                 return 0;
2860         }
2861         return -ENODEV;
2862 }
2863
2864 /*
2865  * Perform get-interface-parameters.ioctl
2866  */
2867 int
2868 isdn_net_getcfg(isdn_net_ioctl_cfg * cfg)
2869 {
2870         isdn_net_dev *p = isdn_net_findif(cfg->name);
2871
2872         if (p) {
2873                 isdn_net_local *lp = p->local;
2874
2875                 strcpy(cfg->eaz, lp->msn);
2876                 cfg->exclusive = lp->exclusive;
2877                 if (lp->pre_device >= 0) {
2878                         sprintf(cfg->drvid, "%s,%d", dev->drvid[lp->pre_device],
2879                                 lp->pre_channel);
2880                 } else
2881                         cfg->drvid[0] = '\0';
2882                 cfg->onhtime = lp->onhtime;
2883                 cfg->charge = lp->charge;
2884                 cfg->l2_proto = lp->l2_proto;
2885                 cfg->l3_proto = lp->l3_proto;
2886                 cfg->p_encap = lp->p_encap;
2887                 cfg->secure = (lp->flags & ISDN_NET_SECURE) ? 1 : 0;
2888                 cfg->callback = 0;
2889                 if (lp->flags & ISDN_NET_CALLBACK)
2890                         cfg->callback = 1;
2891                 if (lp->flags & ISDN_NET_CBOUT)
2892                         cfg->callback = 2;
2893                 cfg->cbhup = (lp->flags & ISDN_NET_CBHUP) ? 1 : 0;
2894                 cfg->dialmode = lp->flags & ISDN_NET_DIALMODE_MASK;
2895                 cfg->chargehup = (lp->hupflags & 4) ? 1 : 0;
2896                 cfg->ihup = (lp->hupflags & 8) ? 1 : 0;
2897                 cfg->cbdelay = lp->cbdelay;
2898                 cfg->dialmax = lp->dialmax;
2899                 cfg->triggercps = lp->triggercps;
2900                 cfg->slavedelay = lp->slavedelay / HZ;
2901                 cfg->chargeint = (lp->hupflags & ISDN_CHARGEHUP) ?
2902                     (lp->chargeint / HZ) : 0;
2903                 cfg->pppbind = lp->pppbind;
2904                 cfg->dialtimeout = lp->dialtimeout >= 0 ? lp->dialtimeout / HZ : -1;
2905                 cfg->dialwait = lp->dialwait / HZ;
2906                 if (lp->slave) {
2907                         if (strlen(lp->slave->name) > 8)
2908                                 strcpy(cfg->slave, "too-long");
2909                         else
2910                                 strcpy(cfg->slave, lp->slave->name);
2911                 } else
2912                         cfg->slave[0] = '\0';
2913                 if (lp->master) {
2914                         if (strlen(lp->master->name) > 8)
2915                                 strcpy(cfg->master, "too-long");
2916                         strcpy(cfg->master, lp->master->name);
2917                 } else
2918                         cfg->master[0] = '\0';
2919                 return 0;
2920         }
2921         return -ENODEV;
2922 }
2923
2924 /*
2925  * Add a phone-number to an interface.
2926  */
2927 int
2928 isdn_net_addphone(isdn_net_ioctl_phone * phone)
2929 {
2930         isdn_net_dev *p = isdn_net_findif(phone->name);
2931         isdn_net_phone *n;
2932
2933         if (p) {
2934                 if (!(n = kmalloc(sizeof(isdn_net_phone), GFP_KERNEL)))
2935                         return -ENOMEM;
2936                 strlcpy(n->num, phone->phone, sizeof(n->num));
2937                 n->next = p->local->phone[phone->outgoing & 1];
2938                 p->local->phone[phone->outgoing & 1] = n;
2939                 return 0;
2940         }
2941         return -ENODEV;
2942 }
2943
2944 /*
2945  * Copy a string of all phone-numbers of an interface to user space.
2946  * This might sleep and must be called with the isdn semaphore down.
2947  */
2948 int
2949 isdn_net_getphones(isdn_net_ioctl_phone * phone, char __user *phones)
2950 {
2951         isdn_net_dev *p = isdn_net_findif(phone->name);
2952         int inout = phone->outgoing & 1;
2953         int more = 0;
2954         int count = 0;
2955         isdn_net_phone *n;
2956
2957         if (!p)
2958                 return -ENODEV;
2959         inout &= 1;
2960         for (n = p->local->phone[inout]; n; n = n->next) {
2961                 if (more) {
2962                         put_user(' ', phones++);
2963                         count++;
2964                 }
2965                 if (copy_to_user(phones, n->num, strlen(n->num) + 1)) {
2966                         return -EFAULT;
2967                 }
2968                 phones += strlen(n->num);
2969                 count += strlen(n->num);
2970                 more = 1;
2971         }
2972         put_user(0, phones);
2973         count++;
2974         return count;
2975 }
2976
2977 /*
2978  * Copy a string containing the peer's phone number of a connected interface
2979  * to user space.
2980  */
2981 int
2982 isdn_net_getpeer(isdn_net_ioctl_phone *phone, isdn_net_ioctl_phone __user *peer)
2983 {
2984         isdn_net_dev *p = isdn_net_findif(phone->name);
2985         int ch, dv, idx;
2986
2987         if (!p)
2988                 return -ENODEV;
2989         /*
2990          * Theoretical race: while this executes, the remote number might
2991          * become invalid (hang up) or change (new connection), resulting
2992          * in (partially) wrong number copied to user. This race
2993          * currently ignored.
2994          */
2995         ch = p->local->isdn_channel;
2996         dv = p->local->isdn_device;
2997         if(ch < 0 && dv < 0)
2998                 return -ENOTCONN;
2999         idx = isdn_dc2minor(dv, ch);
3000         if (idx <0 )
3001                 return -ENODEV;
3002         /* for pre-bound channels, we need this extra check */
3003         if (strncmp(dev->num[idx], "???", 3) == 0)
3004                 return -ENOTCONN;
3005         strncpy(phone->phone, dev->num[idx], ISDN_MSNLEN);
3006         phone->outgoing = USG_OUTGOING(dev->usage[idx]);
3007         if (copy_to_user(peer, phone, sizeof(*peer)))
3008                 return -EFAULT;
3009         return 0;
3010 }
3011 /*
3012  * Delete a phone-number from an interface.
3013  */
3014 int
3015 isdn_net_delphone(isdn_net_ioctl_phone * phone)
3016 {
3017         isdn_net_dev *p = isdn_net_findif(phone->name);
3018         int inout = phone->outgoing & 1;
3019         isdn_net_phone *n;
3020         isdn_net_phone *m;
3021
3022         if (p) {
3023                 n = p->local->phone[inout];
3024                 m = NULL;
3025                 while (n) {
3026                         if (!strcmp(n->num, phone->phone)) {
3027                                 if (p->local->dial == n)
3028                                         p->local->dial = n->next;
3029                                 if (m)
3030                                         m->next = n->next;
3031                                 else
3032                                         p->local->phone[inout] = n->next;
3033                                 kfree(n);
3034                                 return 0;
3035                         }
3036                         m = n;
3037                         n = (isdn_net_phone *) n->next;
3038                 }
3039                 return -EINVAL;
3040         }
3041         return -ENODEV;
3042 }
3043
3044 /*
3045  * Delete all phone-numbers of an interface.
3046  */
3047 static int
3048 isdn_net_rmallphone(isdn_net_dev * p)
3049 {
3050         isdn_net_phone *n;
3051         isdn_net_phone *m;
3052         int i;
3053
3054         for (i = 0; i < 2; i++) {
3055                 n = p->local->phone[i];
3056                 while (n) {
3057                         m = n->next;
3058                         kfree(n);
3059                         n = m;
3060                 }
3061                 p->local->phone[i] = NULL;
3062         }
3063         p->local->dial = NULL;
3064         return 0;
3065 }
3066
3067 /*
3068  * Force a hangup of a network-interface.
3069  */
3070 int
3071 isdn_net_force_hangup(char *name)
3072 {
3073         isdn_net_dev *p = isdn_net_findif(name);
3074         struct net_device *q;
3075
3076         if (p) {
3077                 if (p->local->isdn_device < 0)
3078                         return 1;
3079                 q = p->local->slave;
3080                 /* If this interface has slaves, do a hangup for them also. */
3081                 while (q) {
3082                         isdn_net_hangup(q);
3083                         q = MASTER_TO_SLAVE(q);
3084                 }
3085                 isdn_net_hangup(p->dev);
3086                 return 0;
3087         }
3088         return -ENODEV;
3089 }
3090
3091 /*
3092  * Helper-function for isdn_net_rm: Do the real work.
3093  */
3094 static int
3095 isdn_net_realrm(isdn_net_dev * p, isdn_net_dev * q)
3096 {
3097         u_long flags;
3098
3099         if (isdn_net_device_started(p)) {
3100                 return -EBUSY;
3101         }
3102 #ifdef CONFIG_ISDN_X25
3103         if( p -> cprot && p -> cprot -> pops )
3104                 p -> cprot -> pops -> proto_del ( p -> cprot );
3105 #endif
3106         /* Free all phone-entries */
3107         isdn_net_rmallphone(p);
3108         /* If interface is bound exclusive, free channel-usage */
3109         if (p->local->exclusive != -1)
3110                 isdn_unexclusive_channel(p->local->pre_device, p->local->pre_channel);
3111         if (p->local->master) {
3112                 /* It's a slave-device, so update master's slave-pointer if necessary */
3113                 if (((isdn_net_local *) ISDN_MASTER_PRIV(p->local))->slave ==
3114                     p->dev)
3115                         ((isdn_net_local *)ISDN_MASTER_PRIV(p->local))->slave =
3116                                 p->local->slave;
3117         } else {
3118                 /* Unregister only if it's a master-device */
3119                 unregister_netdev(p->dev);
3120         }
3121         /* Unlink device from chain */
3122         spin_lock_irqsave(&dev->lock, flags);
3123         if (q)
3124                 q->next = p->next;
3125         else
3126                 dev->netdev = p->next;
3127         if (p->local->slave) {
3128                 /* If this interface has a slave, remove it also */
3129                 char *slavename = p->local->slave->name;
3130                 isdn_net_dev *n = dev->netdev;
3131                 q = NULL;
3132                 while (n) {
3133                         if (!strcmp(n->dev->name, slavename)) {
3134                                 spin_unlock_irqrestore(&dev->lock, flags);
3135                                 isdn_net_realrm(n, q);
3136                                 spin_lock_irqsave(&dev->lock, flags);
3137                                 break;
3138                         }
3139                         q = n;
3140                         n = (isdn_net_dev *)n->next;
3141                 }
3142         }
3143         spin_unlock_irqrestore(&dev->lock, flags);
3144         /* If no more net-devices remain, disable auto-hangup timer */
3145         if (dev->netdev == NULL)
3146                 isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 0);
3147         free_netdev(p->dev);
3148         kfree(p);
3149
3150         return 0;
3151 }
3152
3153 /*
3154  * Remove a single network-interface.
3155  */
3156 int
3157 isdn_net_rm(char *name)
3158 {
3159         u_long flags;
3160         isdn_net_dev *p;
3161         isdn_net_dev *q;
3162
3163         /* Search name in netdev-chain */
3164         spin_lock_irqsave(&dev->lock, flags);
3165         p = dev->netdev;
3166         q = NULL;
3167         while (p) {
3168                 if (!strcmp(p->dev->name, name)) {
3169                         spin_unlock_irqrestore(&dev->lock, flags);
3170                         return (isdn_net_realrm(p, q));
3171                 }
3172                 q = p;
3173                 p = (isdn_net_dev *) p->next;
3174         }
3175         spin_unlock_irqrestore(&dev->lock, flags);
3176         /* If no more net-devices remain, disable auto-hangup timer */
3177         if (dev->netdev == NULL)
3178                 isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 0);
3179         return -ENODEV;
3180 }
3181
3182 /*
3183  * Remove all network-interfaces
3184  */
3185 int
3186 isdn_net_rmall(void)
3187 {
3188         u_long flags;
3189         int ret;
3190
3191         /* Walk through netdev-chain */
3192         spin_lock_irqsave(&dev->lock, flags);
3193         while (dev->netdev) {
3194                 if (!dev->netdev->local->master) {
3195                         /* Remove master-devices only, slaves get removed with their master */
3196                         spin_unlock_irqrestore(&dev->lock, flags);
3197                         if ((ret = isdn_net_realrm(dev->netdev, NULL))) {
3198                                 return ret;
3199                         }
3200                         spin_lock_irqsave(&dev->lock, flags);
3201                 }
3202         }
3203         dev->netdev = NULL;
3204         spin_unlock_irqrestore(&dev->lock, flags);
3205         return 0;
3206 }