isdn/i4l: fix buffer overflow
[sfrench/cifs-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 <linux/slab.h>
27 #include <net/arp.h>
28 #include <net/dst.h>
29 #include <net/pkt_sched.h>
30 #include <linux/inetdevice.h>
31 #include "isdn_common.h"
32 #include "isdn_net.h"
33 #ifdef CONFIG_ISDN_PPP
34 #include "isdn_ppp.h"
35 #endif
36 #ifdef CONFIG_ISDN_X25
37 #include <linux/concap.h>
38 #include "isdn_concap.h"
39 #endif
40
41
42 /*
43  * Outline of new tbusy handling:
44  *
45  * Old method, roughly spoken, consisted of setting tbusy when entering
46  * isdn_net_start_xmit() and at several other locations and clearing
47  * it from isdn_net_start_xmit() thread when sending was successful.
48  *
49  * With 2.3.x multithreaded network core, to prevent problems, tbusy should
50  * only be set by the isdn_net_start_xmit() thread and only when a tx-busy
51  * condition is detected. Other threads (in particular isdn_net_stat_callb())
52  * are only allowed to clear tbusy.
53  *
54  * -HE
55  */
56
57 /*
58  * About SOFTNET:
59  * Most of the changes were pretty obvious and basically done by HE already.
60  *
61  * One problem of the isdn net device code is that it uses struct net_device
62  * for masters and slaves. However, only master interface are registered to
63  * the network layer, and therefore, it only makes sense to call netif_*
64  * functions on them.
65  *
66  * --KG
67  */
68
69 /*
70  * Find out if the netdevice has been ifup-ed yet.
71  * For slaves, look at the corresponding master.
72  */
73 static __inline__ int isdn_net_device_started(isdn_net_dev *n)
74 {
75         isdn_net_local *lp = n->local;
76         struct net_device *dev;
77
78         if (lp->master)
79                 dev = lp->master;
80         else
81                 dev = n->dev;
82         return netif_running(dev);
83 }
84
85 /*
86  * wake up the network -> net_device queue.
87  * For slaves, wake the corresponding master interface.
88  */
89 static __inline__ void isdn_net_device_wake_queue(isdn_net_local *lp)
90 {
91         if (lp->master)
92                 netif_wake_queue(lp->master);
93         else
94                 netif_wake_queue(lp->netdev->dev);
95 }
96
97 /*
98  * stop the network -> net_device queue.
99  * For slaves, stop the corresponding master interface.
100  */
101 static __inline__ void isdn_net_device_stop_queue(isdn_net_local *lp)
102 {
103         if (lp->master)
104                 netif_stop_queue(lp->master);
105         else
106                 netif_stop_queue(lp->netdev->dev);
107 }
108
109 /*
110  * find out if the net_device which this lp belongs to (lp can be
111  * master or slave) is busy. It's busy iff all (master and slave)
112  * queues are busy
113  */
114 static __inline__ int isdn_net_device_busy(isdn_net_local *lp)
115 {
116         isdn_net_local *nlp;
117         isdn_net_dev *nd;
118         unsigned long flags;
119
120         if (!isdn_net_lp_busy(lp))
121                 return 0;
122
123         if (lp->master)
124                 nd = ISDN_MASTER_PRIV(lp)->netdev;
125         else
126                 nd = lp->netdev;
127
128         spin_lock_irqsave(&nd->queue_lock, flags);
129         nlp = lp->next;
130         while (nlp != lp) {
131                 if (!isdn_net_lp_busy(nlp)) {
132                         spin_unlock_irqrestore(&nd->queue_lock, flags);
133                         return 0;
134                 }
135                 nlp = nlp->next;
136         }
137         spin_unlock_irqrestore(&nd->queue_lock, flags);
138         return 1;
139 }
140
141 static __inline__ void isdn_net_inc_frame_cnt(isdn_net_local *lp)
142 {
143         atomic_inc(&lp->frame_cnt);
144         if (isdn_net_device_busy(lp))
145                 isdn_net_device_stop_queue(lp);
146 }
147
148 static __inline__ void isdn_net_dec_frame_cnt(isdn_net_local *lp)
149 {
150         atomic_dec(&lp->frame_cnt);
151
152         if (!(isdn_net_device_busy(lp))) {
153                 if (!skb_queue_empty(&lp->super_tx_queue)) {
154                         schedule_work(&lp->tqueue);
155                 } else {
156                         isdn_net_device_wake_queue(lp);
157                 }
158         }
159 }
160
161 static __inline__ void isdn_net_zero_frame_cnt(isdn_net_local *lp)
162 {
163         atomic_set(&lp->frame_cnt, 0);
164 }
165
166 /* For 2.2.x we leave the transmitter busy timeout at 2 secs, just
167  * to be safe.
168  * For 2.3.x we push it up to 20 secs, because call establishment
169  * (in particular callback) may take such a long time, and we
170  * don't want confusing messages in the log. However, there is a slight
171  * possibility that this large timeout will break other things like MPPP,
172  * which might rely on the tx timeout. If so, we'll find out this way...
173  */
174
175 #define ISDN_NET_TX_TIMEOUT (20 * HZ)
176
177 /* Prototypes */
178
179 static int isdn_net_force_dial_lp(isdn_net_local *);
180 static netdev_tx_t isdn_net_start_xmit(struct sk_buff *,
181                                        struct net_device *);
182
183 static void isdn_net_ciscohdlck_connected(isdn_net_local *lp);
184 static void isdn_net_ciscohdlck_disconnected(isdn_net_local *lp);
185
186 char *isdn_net_revision = "$Revision: 1.1.2.2 $";
187
188 /*
189  * Code for raw-networking over ISDN
190  */
191
192 static void
193 isdn_net_unreachable(struct net_device *dev, struct sk_buff *skb, char *reason)
194 {
195         if (skb) {
196
197                 u_short proto = ntohs(skb->protocol);
198
199                 printk(KERN_DEBUG "isdn_net: %s: %s, signalling dst_link_failure %s\n",
200                        dev->name,
201                        (reason != NULL) ? reason : "unknown",
202                        (proto != ETH_P_IP) ? "Protocol != ETH_P_IP" : "");
203
204                 dst_link_failure(skb);
205         }
206         else {  /* dial not triggered by rawIP packet */
207                 printk(KERN_DEBUG "isdn_net: %s: %s\n",
208                        dev->name,
209                        (reason != NULL) ? reason : "reason unknown");
210         }
211 }
212
213 static void
214 isdn_net_reset(struct net_device *dev)
215 {
216 #ifdef CONFIG_ISDN_X25
217         struct concap_device_ops *dops =
218                 ((isdn_net_local *)netdev_priv(dev))->dops;
219         struct concap_proto *cprot =
220                 ((isdn_net_local *)netdev_priv(dev))->netdev->cprot;
221 #endif
222 #ifdef CONFIG_ISDN_X25
223         if (cprot && cprot->pops && dops)
224                 cprot->pops->restart(cprot, dev, dops);
225 #endif
226 }
227
228 /* Open/initialize the board. */
229 static int
230 isdn_net_open(struct net_device *dev)
231 {
232         int i;
233         struct net_device *p;
234         struct in_device *in_dev;
235
236         /* moved here from isdn_net_reset, because only the master has an
237            interface associated which is supposed to be started. BTW:
238            we need to call netif_start_queue, not netif_wake_queue here */
239         netif_start_queue(dev);
240
241         isdn_net_reset(dev);
242         /* Fill in the MAC-level header (not needed, but for compatibility... */
243         for (i = 0; i < ETH_ALEN - sizeof(u32); i++)
244                 dev->dev_addr[i] = 0xfc;
245         if ((in_dev = dev->ip_ptr) != NULL) {
246                 /*
247                  *      Any address will do - we take the first
248                  */
249                 struct in_ifaddr *ifa = in_dev->ifa_list;
250                 if (ifa != NULL)
251                         memcpy(dev->dev_addr + 2, &ifa->ifa_local, 4);
252         }
253
254         /* If this interface has slaves, start them also */
255         p = MASTER_TO_SLAVE(dev);
256         if (p) {
257                 while (p) {
258                         isdn_net_reset(p);
259                         p = MASTER_TO_SLAVE(p);
260                 }
261         }
262         isdn_lock_drivers();
263         return 0;
264 }
265
266 /*
267  * Assign an ISDN-channel to a net-interface
268  */
269 static void
270 isdn_net_bind_channel(isdn_net_local *lp, int idx)
271 {
272         lp->flags |= ISDN_NET_CONNECTED;
273         lp->isdn_device = dev->drvmap[idx];
274         lp->isdn_channel = dev->chanmap[idx];
275         dev->rx_netdev[idx] = lp->netdev;
276         dev->st_netdev[idx] = lp->netdev;
277 }
278
279 /*
280  * unbind a net-interface (resets interface after an error)
281  */
282 static void
283 isdn_net_unbind_channel(isdn_net_local *lp)
284 {
285         skb_queue_purge(&lp->super_tx_queue);
286
287         if (!lp->master) {      /* reset only master device */
288                 /* Moral equivalent of dev_purge_queues():
289                    BEWARE! This chunk of code cannot be called from hardware
290                    interrupt handler. I hope it is true. --ANK
291                 */
292                 qdisc_reset_all_tx(lp->netdev->dev);
293         }
294         lp->dialstate = 0;
295         dev->rx_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
296         dev->st_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL;
297         if (lp->isdn_device != -1 && lp->isdn_channel != -1)
298                 isdn_free_channel(lp->isdn_device, lp->isdn_channel,
299                                   ISDN_USAGE_NET);
300         lp->flags &= ~ISDN_NET_CONNECTED;
301         lp->isdn_device = -1;
302         lp->isdn_channel = -1;
303 }
304
305 /*
306  * Perform auto-hangup and cps-calculation for net-interfaces.
307  *
308  * auto-hangup:
309  * Increment idle-counter (this counter is reset on any incoming or
310  * outgoing packet), if counter exceeds configured limit either do a
311  * hangup immediately or - if configured - wait until just before the next
312  * charge-info.
313  *
314  * cps-calculation (needed for dynamic channel-bundling):
315  * Since this function is called every second, simply reset the
316  * byte-counter of the interface after copying it to the cps-variable.
317  */
318 static unsigned long last_jiffies = -HZ;
319
320 void
321 isdn_net_autohup(void)
322 {
323         isdn_net_dev *p = dev->netdev;
324         int anymore;
325
326         anymore = 0;
327         while (p) {
328                 isdn_net_local *l = p->local;
329                 if (jiffies == last_jiffies)
330                         l->cps = l->transcount;
331                 else
332                         l->cps = (l->transcount * HZ) / (jiffies - last_jiffies);
333                 l->transcount = 0;
334                 if (dev->net_verbose > 3)
335                         printk(KERN_DEBUG "%s: %d bogocps\n", p->dev->name, l->cps);
336                 if ((l->flags & ISDN_NET_CONNECTED) && (!l->dialstate)) {
337                         anymore = 1;
338                         l->huptimer++;
339                         /*
340                          * if there is some dialmode where timeout-hangup
341                          * should _not_ be done, check for that here
342                          */
343                         if ((l->onhtime) &&
344                             (l->huptimer > l->onhtime))
345                         {
346                                 if (l->hupflags & ISDN_MANCHARGE &&
347                                     l->hupflags & ISDN_CHARGEHUP) {
348                                         while (time_after(jiffies, l->chargetime + l->chargeint))
349                                                 l->chargetime += l->chargeint;
350                                         if (time_after(jiffies, l->chargetime + l->chargeint - 2 * HZ))
351                                                 if (l->outgoing || l->hupflags & ISDN_INHUP)
352                                                         isdn_net_hangup(p->dev);
353                                 } else if (l->outgoing) {
354                                         if (l->hupflags & ISDN_CHARGEHUP) {
355                                                 if (l->hupflags & ISDN_WAITCHARGE) {
356                                                         printk(KERN_DEBUG "isdn_net: Hupflags of %s are %X\n",
357                                                                p->dev->name, l->hupflags);
358                                                         isdn_net_hangup(p->dev);
359                                                 } else if (time_after(jiffies, l->chargetime + l->chargeint)) {
360                                                         printk(KERN_DEBUG
361                                                                "isdn_net: %s: chtime = %lu, chint = %d\n",
362                                                                p->dev->name, l->chargetime, l->chargeint);
363                                                         isdn_net_hangup(p->dev);
364                                                 }
365                                         } else
366                                                 isdn_net_hangup(p->dev);
367                                 } else if (l->hupflags & ISDN_INHUP)
368                                         isdn_net_hangup(p->dev);
369                         }
370
371                         if (dev->global_flags & ISDN_GLOBAL_STOPPED || (ISDN_NET_DIALMODE(*l) == ISDN_NET_DM_OFF)) {
372                                 isdn_net_hangup(p->dev);
373                                 break;
374                         }
375                 }
376                 p = (isdn_net_dev *) p->next;
377         }
378         last_jiffies = jiffies;
379         isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, anymore);
380 }
381
382 static void isdn_net_lp_disconnected(isdn_net_local *lp)
383 {
384         isdn_net_rm_from_bundle(lp);
385 }
386
387 /*
388  * Handle status-messages from ISDN-interfacecard.
389  * This function is called from within the main-status-dispatcher
390  * isdn_status_callback, which itself is called from the low-level driver.
391  * Return: 1 = Event handled, 0 = not for us or unknown Event.
392  */
393 int
394 isdn_net_stat_callback(int idx, isdn_ctrl *c)
395 {
396         isdn_net_dev *p = dev->st_netdev[idx];
397         int cmd = c->command;
398
399         if (p) {
400                 isdn_net_local *lp = p->local;
401 #ifdef CONFIG_ISDN_X25
402                 struct concap_proto *cprot = lp->netdev->cprot;
403                 struct concap_proto_ops *pops = cprot ? cprot->pops : NULL;
404 #endif
405                 switch (cmd) {
406                 case ISDN_STAT_BSENT:
407                         /* A packet has successfully been sent out */
408                         if ((lp->flags & ISDN_NET_CONNECTED) &&
409                             (!lp->dialstate)) {
410                                 isdn_net_dec_frame_cnt(lp);
411                                 lp->stats.tx_packets++;
412                                 lp->stats.tx_bytes += c->parm.length;
413                         }
414                         return 1;
415                 case ISDN_STAT_DCONN:
416                         /* D-Channel is up */
417                         switch (lp->dialstate) {
418                         case 4:
419                         case 7:
420                         case 8:
421                                 lp->dialstate++;
422                                 return 1;
423                         case 12:
424                                 lp->dialstate = 5;
425                                 return 1;
426                         }
427                         break;
428                 case ISDN_STAT_DHUP:
429                         /* Either D-Channel-hangup or error during dialout */
430 #ifdef CONFIG_ISDN_X25
431                         /* If we are not connencted then dialing had
432                            failed. If there are generic encap protocol
433                            receiver routines signal the closure of
434                            the link*/
435
436                         if (!(lp->flags & ISDN_NET_CONNECTED)
437                             && pops && pops->disconn_ind)
438                                 pops->disconn_ind(cprot);
439 #endif /* CONFIG_ISDN_X25 */
440                         if ((!lp->dialstate) && (lp->flags & ISDN_NET_CONNECTED)) {
441                                 if (lp->p_encap == ISDN_NET_ENCAP_CISCOHDLCK)
442                                         isdn_net_ciscohdlck_disconnected(lp);
443 #ifdef CONFIG_ISDN_PPP
444                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
445                                         isdn_ppp_free(lp);
446 #endif
447                                 isdn_net_lp_disconnected(lp);
448                                 isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
449                                 printk(KERN_INFO "%s: remote hangup\n", p->dev->name);
450                                 printk(KERN_INFO "%s: Chargesum is %d\n", p->dev->name,
451                                        lp->charge);
452                                 isdn_net_unbind_channel(lp);
453                                 return 1;
454                         }
455                         break;
456 #ifdef CONFIG_ISDN_X25
457                 case ISDN_STAT_BHUP:
458                         /* B-Channel-hangup */
459                         /* try if there are generic encap protocol
460                            receiver routines and signal the closure of
461                            the link */
462                         if (pops && pops->disconn_ind) {
463                                 pops->disconn_ind(cprot);
464                                 return 1;
465                         }
466                         break;
467 #endif /* CONFIG_ISDN_X25 */
468                 case ISDN_STAT_BCONN:
469                         /* B-Channel is up */
470                         isdn_net_zero_frame_cnt(lp);
471                         switch (lp->dialstate) {
472                         case 5:
473                         case 6:
474                         case 7:
475                         case 8:
476                         case 9:
477                         case 10:
478                         case 12:
479                                 if (lp->dialstate <= 6) {
480                                         dev->usage[idx] |= ISDN_USAGE_OUTGOING;
481                                         isdn_info_update();
482                                 } else
483                                         dev->rx_netdev[idx] = p;
484                                 lp->dialstate = 0;
485                                 isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 1);
486                                 if (lp->p_encap == ISDN_NET_ENCAP_CISCOHDLCK)
487                                         isdn_net_ciscohdlck_connected(lp);
488                                 if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP) {
489                                         if (lp->master) { /* is lp a slave? */
490                                                 isdn_net_dev *nd = ISDN_MASTER_PRIV(lp)->netdev;
491                                                 isdn_net_add_to_bundle(nd, lp);
492                                         }
493                                 }
494                                 printk(KERN_INFO "isdn_net: %s connected\n", p->dev->name);
495                                 /* If first Chargeinfo comes before B-Channel connect,
496                                  * we correct the timestamp here.
497                                  */
498                                 lp->chargetime = jiffies;
499
500                                 /* reset dial-timeout */
501                                 lp->dialstarted = 0;
502                                 lp->dialwait_timer = 0;
503
504 #ifdef CONFIG_ISDN_PPP
505                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
506                                         isdn_ppp_wakeup_daemon(lp);
507 #endif
508 #ifdef CONFIG_ISDN_X25
509                                 /* try if there are generic concap receiver routines */
510                                 if (pops)
511                                         if (pops->connect_ind)
512                                                 pops->connect_ind(cprot);
513 #endif /* CONFIG_ISDN_X25 */
514                                 /* ppp needs to do negotiations first */
515                                 if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP)
516                                         isdn_net_device_wake_queue(lp);
517                                 return 1;
518                         }
519                         break;
520                 case ISDN_STAT_NODCH:
521                         /* No D-Channel avail. */
522                         if (lp->dialstate == 4) {
523                                 lp->dialstate--;
524                                 return 1;
525                         }
526                         break;
527                 case ISDN_STAT_CINF:
528                         /* Charge-info from TelCo. Calculate interval between
529                          * charge-infos and set timestamp for last info for
530                          * usage by isdn_net_autohup()
531                          */
532                         lp->charge++;
533                         if (lp->hupflags & ISDN_HAVECHARGE) {
534                                 lp->hupflags &= ~ISDN_WAITCHARGE;
535                                 lp->chargeint = jiffies - lp->chargetime - (2 * HZ);
536                         }
537                         if (lp->hupflags & ISDN_WAITCHARGE)
538                                 lp->hupflags |= ISDN_HAVECHARGE;
539                         lp->chargetime = jiffies;
540                         printk(KERN_DEBUG "isdn_net: Got CINF chargetime of %s now %lu\n",
541                                p->dev->name, lp->chargetime);
542                         return 1;
543                 }
544         }
545         return 0;
546 }
547
548 /*
549  * Perform dialout for net-interfaces and timeout-handling for
550  * D-Channel-up and B-Channel-up Messages.
551  * This function is initially called from within isdn_net_start_xmit() or
552  * or isdn_net_find_icall() after initializing the dialstate for an
553  * interface. If further calls are needed, the function schedules itself
554  * for a timer-callback via isdn_timer_function().
555  * The dialstate is also affected by incoming status-messages from
556  * the ISDN-Channel which are handled in isdn_net_stat_callback() above.
557  */
558 void
559 isdn_net_dial(void)
560 {
561         isdn_net_dev *p = dev->netdev;
562         int anymore = 0;
563         int i;
564         isdn_ctrl cmd;
565         u_char *phone_number;
566
567         while (p) {
568                 isdn_net_local *lp = p->local;
569
570 #ifdef ISDN_DEBUG_NET_DIAL
571                 if (lp->dialstate)
572                         printk(KERN_DEBUG "%s: dialstate=%d\n", p->dev->name, lp->dialstate);
573 #endif
574                 switch (lp->dialstate) {
575                 case 0:
576                         /* Nothing to do for this interface */
577                         break;
578                 case 1:
579                         /* Initiate dialout. Set phone-number-pointer to first number
580                          * of interface.
581                          */
582                         lp->dial = lp->phone[1];
583                         if (!lp->dial) {
584                                 printk(KERN_WARNING "%s: phone number deleted?\n",
585                                        p->dev->name);
586                                 isdn_net_hangup(p->dev);
587                                 break;
588                         }
589                         anymore = 1;
590
591                         if (lp->dialtimeout > 0)
592                                 if (lp->dialstarted == 0 || time_after(jiffies, lp->dialstarted + lp->dialtimeout + lp->dialwait)) {
593                                         lp->dialstarted = jiffies;
594                                         lp->dialwait_timer = 0;
595                                 }
596
597                         lp->dialstate++;
598                         /* Fall through */
599                 case 2:
600                         /* Prepare dialing. Clear EAZ, then set EAZ. */
601                         cmd.driver = lp->isdn_device;
602                         cmd.arg = lp->isdn_channel;
603                         cmd.command = ISDN_CMD_CLREAZ;
604                         isdn_command(&cmd);
605                         sprintf(cmd.parm.num, "%s", isdn_map_eaz2msn(lp->msn, cmd.driver));
606                         cmd.command = ISDN_CMD_SETEAZ;
607                         isdn_command(&cmd);
608                         lp->dialretry = 0;
609                         anymore = 1;
610                         lp->dialstate++;
611                         /* Fall through */
612                 case 3:
613                         /* Setup interface, dial current phone-number, switch to next number.
614                          * If list of phone-numbers is exhausted, increment
615                          * retry-counter.
616                          */
617                         if (dev->global_flags & ISDN_GLOBAL_STOPPED || (ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_OFF)) {
618                                 char *s;
619                                 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
620                                         s = "dial suppressed: isdn system stopped";
621                                 else
622                                         s = "dial suppressed: dialmode `off'";
623                                 isdn_net_unreachable(p->dev, NULL, s);
624                                 isdn_net_hangup(p->dev);
625                                 break;
626                         }
627                         cmd.driver = lp->isdn_device;
628                         cmd.command = ISDN_CMD_SETL2;
629                         cmd.arg = lp->isdn_channel + (lp->l2_proto << 8);
630                         isdn_command(&cmd);
631                         cmd.driver = lp->isdn_device;
632                         cmd.command = ISDN_CMD_SETL3;
633                         cmd.arg = lp->isdn_channel + (lp->l3_proto << 8);
634                         isdn_command(&cmd);
635                         cmd.driver = lp->isdn_device;
636                         cmd.arg = lp->isdn_channel;
637                         if (!lp->dial) {
638                                 printk(KERN_WARNING "%s: phone number deleted?\n",
639                                        p->dev->name);
640                                 isdn_net_hangup(p->dev);
641                                 break;
642                         }
643                         if (!strncmp(lp->dial->num, "LEASED", strlen("LEASED"))) {
644                                 lp->dialstate = 4;
645                                 printk(KERN_INFO "%s: Open leased line ...\n", p->dev->name);
646                         } else {
647                                 if (lp->dialtimeout > 0)
648                                         if (time_after(jiffies, lp->dialstarted + lp->dialtimeout)) {
649                                                 lp->dialwait_timer = jiffies + lp->dialwait;
650                                                 lp->dialstarted = 0;
651                                                 isdn_net_unreachable(p->dev, NULL, "dial: timed out");
652                                                 isdn_net_hangup(p->dev);
653                                                 break;
654                                         }
655
656                                 cmd.driver = lp->isdn_device;
657                                 cmd.command = ISDN_CMD_DIAL;
658                                 cmd.parm.setup.si2 = 0;
659
660                                 /* check for DOV */
661                                 phone_number = lp->dial->num;
662                                 if ((*phone_number == 'v') ||
663                                     (*phone_number == 'V')) { /* DOV call */
664                                         cmd.parm.setup.si1 = 1;
665                                 } else { /* DATA call */
666                                         cmd.parm.setup.si1 = 7;
667                                 }
668
669                                 strcpy(cmd.parm.setup.phone, phone_number);
670                                 /*
671                                  * Switch to next number or back to start if at end of list.
672                                  */
673                                 if (!(lp->dial = (isdn_net_phone *) lp->dial->next)) {
674                                         lp->dial = lp->phone[1];
675                                         lp->dialretry++;
676
677                                         if (lp->dialretry > lp->dialmax) {
678                                                 if (lp->dialtimeout == 0) {
679                                                         lp->dialwait_timer = jiffies + lp->dialwait;
680                                                         lp->dialstarted = 0;
681                                                         isdn_net_unreachable(p->dev, NULL, "dial: tried all numbers dialmax times");
682                                                 }
683                                                 isdn_net_hangup(p->dev);
684                                                 break;
685                                         }
686                                 }
687                                 sprintf(cmd.parm.setup.eazmsn, "%s",
688                                         isdn_map_eaz2msn(lp->msn, cmd.driver));
689                                 i = isdn_dc2minor(lp->isdn_device, lp->isdn_channel);
690                                 if (i >= 0) {
691                                         strcpy(dev->num[i], cmd.parm.setup.phone);
692                                         dev->usage[i] |= ISDN_USAGE_OUTGOING;
693                                         isdn_info_update();
694                                 }
695                                 printk(KERN_INFO "%s: dialing %d %s... %s\n", p->dev->name,
696                                        lp->dialretry, cmd.parm.setup.phone,
697                                        (cmd.parm.setup.si1 == 1) ? "DOV" : "");
698                                 lp->dtimer = 0;
699 #ifdef ISDN_DEBUG_NET_DIAL
700                                 printk(KERN_DEBUG "dial: d=%d c=%d\n", lp->isdn_device,
701                                        lp->isdn_channel);
702 #endif
703                                 isdn_command(&cmd);
704                         }
705                         lp->huptimer = 0;
706                         lp->outgoing = 1;
707                         if (lp->chargeint) {
708                                 lp->hupflags |= ISDN_HAVECHARGE;
709                                 lp->hupflags &= ~ISDN_WAITCHARGE;
710                         } else {
711                                 lp->hupflags |= ISDN_WAITCHARGE;
712                                 lp->hupflags &= ~ISDN_HAVECHARGE;
713                         }
714                         anymore = 1;
715                         lp->dialstate =
716                                 (lp->cbdelay &&
717                                  (lp->flags & ISDN_NET_CBOUT)) ? 12 : 4;
718                         break;
719                 case 4:
720                         /* Wait for D-Channel-connect.
721                          * If timeout, switch back to state 3.
722                          * Dialmax-handling moved to state 3.
723                          */
724                         if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10)
725                                 lp->dialstate = 3;
726                         anymore = 1;
727                         break;
728                 case 5:
729                         /* Got D-Channel-Connect, send B-Channel-request */
730                         cmd.driver = lp->isdn_device;
731                         cmd.arg = lp->isdn_channel;
732                         cmd.command = ISDN_CMD_ACCEPTB;
733                         anymore = 1;
734                         lp->dtimer = 0;
735                         lp->dialstate++;
736                         isdn_command(&cmd);
737                         break;
738                 case 6:
739                         /* Wait for B- or D-Channel-connect. If timeout,
740                          * switch back to state 3.
741                          */
742 #ifdef ISDN_DEBUG_NET_DIAL
743                         printk(KERN_DEBUG "dialtimer2: %d\n", lp->dtimer);
744 #endif
745                         if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10)
746                                 lp->dialstate = 3;
747                         anymore = 1;
748                         break;
749                 case 7:
750                         /* Got incoming Call, setup L2 and L3 protocols,
751                          * then wait for D-Channel-connect
752                          */
753 #ifdef ISDN_DEBUG_NET_DIAL
754                         printk(KERN_DEBUG "dialtimer4: %d\n", lp->dtimer);
755 #endif
756                         cmd.driver = lp->isdn_device;
757                         cmd.command = ISDN_CMD_SETL2;
758                         cmd.arg = lp->isdn_channel + (lp->l2_proto << 8);
759                         isdn_command(&cmd);
760                         cmd.driver = lp->isdn_device;
761                         cmd.command = ISDN_CMD_SETL3;
762                         cmd.arg = lp->isdn_channel + (lp->l3_proto << 8);
763                         isdn_command(&cmd);
764                         if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT15)
765                                 isdn_net_hangup(p->dev);
766                         else {
767                                 anymore = 1;
768                                 lp->dialstate++;
769                         }
770                         break;
771                 case 9:
772                         /* Got incoming D-Channel-Connect, send B-Channel-request */
773                         cmd.driver = lp->isdn_device;
774                         cmd.arg = lp->isdn_channel;
775                         cmd.command = ISDN_CMD_ACCEPTB;
776                         isdn_command(&cmd);
777                         anymore = 1;
778                         lp->dtimer = 0;
779                         lp->dialstate++;
780                         break;
781                 case 8:
782                 case 10:
783                         /*  Wait for B- or D-channel-connect */
784 #ifdef ISDN_DEBUG_NET_DIAL
785                         printk(KERN_DEBUG "dialtimer4: %d\n", lp->dtimer);
786 #endif
787                         if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10)
788                                 isdn_net_hangup(p->dev);
789                         else
790                                 anymore = 1;
791                         break;
792                 case 11:
793                         /* Callback Delay */
794                         if (lp->dtimer++ > lp->cbdelay)
795                                 lp->dialstate = 1;
796                         anymore = 1;
797                         break;
798                 case 12:
799                         /* Remote does callback. Hangup after cbdelay, then wait for incoming
800                          * call (in state 4).
801                          */
802                         if (lp->dtimer++ > lp->cbdelay)
803                         {
804                                 printk(KERN_INFO "%s: hangup waiting for callback ...\n", p->dev->name);
805                                 lp->dtimer = 0;
806                                 lp->dialstate = 4;
807                                 cmd.driver = lp->isdn_device;
808                                 cmd.command = ISDN_CMD_HANGUP;
809                                 cmd.arg = lp->isdn_channel;
810                                 isdn_command(&cmd);
811                                 isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
812                         }
813                         anymore = 1;
814                         break;
815                 default:
816                         printk(KERN_WARNING "isdn_net: Illegal dialstate %d for device %s\n",
817                                lp->dialstate, p->dev->name);
818                 }
819                 p = (isdn_net_dev *) p->next;
820         }
821         isdn_timer_ctrl(ISDN_TIMER_NETDIAL, anymore);
822 }
823
824 /*
825  * Perform hangup for a net-interface.
826  */
827 void
828 isdn_net_hangup(struct net_device *d)
829 {
830         isdn_net_local *lp = netdev_priv(d);
831         isdn_ctrl cmd;
832 #ifdef CONFIG_ISDN_X25
833         struct concap_proto *cprot = lp->netdev->cprot;
834         struct concap_proto_ops *pops = cprot ? cprot->pops : NULL;
835 #endif
836
837         if (lp->flags & ISDN_NET_CONNECTED) {
838                 if (lp->slave != NULL) {
839                         isdn_net_local *slp = ISDN_SLAVE_PRIV(lp);
840                         if (slp->flags & ISDN_NET_CONNECTED) {
841                                 printk(KERN_INFO
842                                        "isdn_net: hang up slave %s before %s\n",
843                                        lp->slave->name, d->name);
844                                 isdn_net_hangup(lp->slave);
845                         }
846                 }
847                 printk(KERN_INFO "isdn_net: local hangup %s\n", d->name);
848 #ifdef CONFIG_ISDN_PPP
849                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
850                         isdn_ppp_free(lp);
851 #endif
852                 isdn_net_lp_disconnected(lp);
853 #ifdef CONFIG_ISDN_X25
854                 /* try if there are generic encap protocol
855                    receiver routines and signal the closure of
856                    the link */
857                 if (pops && pops->disconn_ind)
858                         pops->disconn_ind(cprot);
859 #endif /* CONFIG_ISDN_X25 */
860
861                 cmd.driver = lp->isdn_device;
862                 cmd.command = ISDN_CMD_HANGUP;
863                 cmd.arg = lp->isdn_channel;
864                 isdn_command(&cmd);
865                 printk(KERN_INFO "%s: Chargesum is %d\n", d->name, lp->charge);
866                 isdn_all_eaz(lp->isdn_device, lp->isdn_channel);
867         }
868         isdn_net_unbind_channel(lp);
869 }
870
871 typedef struct {
872         __be16 source;
873         __be16 dest;
874 } ip_ports;
875
876 static void
877 isdn_net_log_skb(struct sk_buff *skb, isdn_net_local *lp)
878 {
879         /* hopefully, this was set correctly */
880         const u_char *p = skb_network_header(skb);
881         unsigned short proto = ntohs(skb->protocol);
882         int data_ofs;
883         ip_ports *ipp;
884         char addinfo[100];
885
886         addinfo[0] = '\0';
887         /* This check stolen from 2.1.72 dev_queue_xmit_nit() */
888         if (p < skb->data || skb_network_header(skb) >= skb_tail_pointer(skb)) {
889                 /* fall back to old isdn_net_log_packet method() */
890                 char *buf = skb->data;
891
892                 printk(KERN_DEBUG "isdn_net: protocol %04x is buggy, dev %s\n", skb->protocol, lp->netdev->dev->name);
893                 p = buf;
894                 proto = ETH_P_IP;
895                 switch (lp->p_encap) {
896                 case ISDN_NET_ENCAP_IPTYP:
897                         proto = ntohs(*(__be16 *)&buf[0]);
898                         p = &buf[2];
899                         break;
900                 case ISDN_NET_ENCAP_ETHER:
901                         proto = ntohs(*(__be16 *)&buf[12]);
902                         p = &buf[14];
903                         break;
904                 case ISDN_NET_ENCAP_CISCOHDLC:
905                         proto = ntohs(*(__be16 *)&buf[2]);
906                         p = &buf[4];
907                         break;
908 #ifdef CONFIG_ISDN_PPP
909                 case ISDN_NET_ENCAP_SYNCPPP:
910                         proto = ntohs(skb->protocol);
911                         p = &buf[IPPP_MAX_HEADER];
912                         break;
913 #endif
914                 }
915         }
916         data_ofs = ((p[0] & 15) * 4);
917         switch (proto) {
918         case ETH_P_IP:
919                 switch (p[9]) {
920                 case 1:
921                         strcpy(addinfo, " ICMP");
922                         break;
923                 case 2:
924                         strcpy(addinfo, " IGMP");
925                         break;
926                 case 4:
927                         strcpy(addinfo, " IPIP");
928                         break;
929                 case 6:
930                         ipp = (ip_ports *) (&p[data_ofs]);
931                         sprintf(addinfo, " TCP, port: %d -> %d", ntohs(ipp->source),
932                                 ntohs(ipp->dest));
933                         break;
934                 case 8:
935                         strcpy(addinfo, " EGP");
936                         break;
937                 case 12:
938                         strcpy(addinfo, " PUP");
939                         break;
940                 case 17:
941                         ipp = (ip_ports *) (&p[data_ofs]);
942                         sprintf(addinfo, " UDP, port: %d -> %d", ntohs(ipp->source),
943                                 ntohs(ipp->dest));
944                         break;
945                 case 22:
946                         strcpy(addinfo, " IDP");
947                         break;
948                 }
949                 printk(KERN_INFO "OPEN: %pI4 -> %pI4%s\n",
950                        p + 12, p + 16, addinfo);
951                 break;
952         case ETH_P_ARP:
953                 printk(KERN_INFO "OPEN: ARP %pI4 -> *.*.*.* ?%pI4\n",
954                        p + 14, p + 24);
955                 break;
956         }
957 }
958
959 /*
960  * this function is used to send supervisory data, i.e. data which was
961  * not received from the network layer, but e.g. frames from ipppd, CCP
962  * reset frames etc.
963  */
964 void isdn_net_write_super(isdn_net_local *lp, struct sk_buff *skb)
965 {
966         if (in_irq()) {
967                 // we can't grab the lock from irq context,
968                 // so we just queue the packet
969                 skb_queue_tail(&lp->super_tx_queue, skb);
970                 schedule_work(&lp->tqueue);
971                 return;
972         }
973
974         spin_lock_bh(&lp->xmit_lock);
975         if (!isdn_net_lp_busy(lp)) {
976                 isdn_net_writebuf_skb(lp, skb);
977         } else {
978                 skb_queue_tail(&lp->super_tx_queue, skb);
979         }
980         spin_unlock_bh(&lp->xmit_lock);
981 }
982
983 /*
984  * called from tq_immediate
985  */
986 static void isdn_net_softint(struct work_struct *work)
987 {
988         isdn_net_local *lp = container_of(work, isdn_net_local, tqueue);
989         struct sk_buff *skb;
990
991         spin_lock_bh(&lp->xmit_lock);
992         while (!isdn_net_lp_busy(lp)) {
993                 skb = skb_dequeue(&lp->super_tx_queue);
994                 if (!skb)
995                         break;
996                 isdn_net_writebuf_skb(lp, skb);
997         }
998         spin_unlock_bh(&lp->xmit_lock);
999 }
1000
1001 /*
1002  * all frames sent from the (net) LL to a HL driver should go via this function
1003  * it's serialized by the caller holding the lp->xmit_lock spinlock
1004  */
1005 void isdn_net_writebuf_skb(isdn_net_local *lp, struct sk_buff *skb)
1006 {
1007         int ret;
1008         int len = skb->len;     /* save len */
1009
1010         /* before obtaining the lock the caller should have checked that
1011            the lp isn't busy */
1012         if (isdn_net_lp_busy(lp)) {
1013                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1014                 goto error;
1015         }
1016
1017         if (!(lp->flags & ISDN_NET_CONNECTED)) {
1018                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1019                 goto error;
1020         }
1021         ret = isdn_writebuf_skb_stub(lp->isdn_device, lp->isdn_channel, 1, skb);
1022         if (ret != len) {
1023                 /* we should never get here */
1024                 printk(KERN_WARNING "%s: HL driver queue full\n", lp->netdev->dev->name);
1025                 goto error;
1026         }
1027
1028         lp->transcount += len;
1029         isdn_net_inc_frame_cnt(lp);
1030         return;
1031
1032 error:
1033         dev_kfree_skb(skb);
1034         lp->stats.tx_errors++;
1035
1036 }
1037
1038
1039 /*
1040  *  Helper function for isdn_net_start_xmit.
1041  *  When called, the connection is already established.
1042  *  Based on cps-calculation, check if device is overloaded.
1043  *  If so, and if a slave exists, trigger dialing for it.
1044  *  If any slave is online, deliver packets using a simple round robin
1045  *  scheme.
1046  *
1047  *  Return: 0 on success, !0 on failure.
1048  */
1049
1050 static int
1051 isdn_net_xmit(struct net_device *ndev, struct sk_buff *skb)
1052 {
1053         isdn_net_dev *nd;
1054         isdn_net_local *slp;
1055         isdn_net_local *lp = netdev_priv(ndev);
1056         int retv = NETDEV_TX_OK;
1057
1058         if (((isdn_net_local *) netdev_priv(ndev))->master) {
1059                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1060                 dev_kfree_skb(skb);
1061                 return NETDEV_TX_OK;
1062         }
1063
1064         /* For the other encaps the header has already been built */
1065 #ifdef CONFIG_ISDN_PPP
1066         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
1067                 return isdn_ppp_xmit(skb, ndev);
1068         }
1069 #endif
1070         nd = ((isdn_net_local *) netdev_priv(ndev))->netdev;
1071         lp = isdn_net_get_locked_lp(nd);
1072         if (!lp) {
1073                 printk(KERN_WARNING "%s: all channels busy - requeuing!\n", ndev->name);
1074                 return NETDEV_TX_BUSY;
1075         }
1076         /* we have our lp locked from now on */
1077
1078         /* Reset hangup-timeout */
1079         lp->huptimer = 0; // FIXME?
1080         isdn_net_writebuf_skb(lp, skb);
1081         spin_unlock_bh(&lp->xmit_lock);
1082
1083         /* the following stuff is here for backwards compatibility.
1084          * in future, start-up and hangup of slaves (based on current load)
1085          * should move to userspace and get based on an overall cps
1086          * calculation
1087          */
1088         if (lp->cps > lp->triggercps) {
1089                 if (lp->slave) {
1090                         if (!lp->sqfull) {
1091                                 /* First time overload: set timestamp only */
1092                                 lp->sqfull = 1;
1093                                 lp->sqfull_stamp = jiffies;
1094                         } else {
1095                                 /* subsequent overload: if slavedelay exceeded, start dialing */
1096                                 if (time_after(jiffies, lp->sqfull_stamp + lp->slavedelay)) {
1097                                         slp = ISDN_SLAVE_PRIV(lp);
1098                                         if (!(slp->flags & ISDN_NET_CONNECTED)) {
1099                                                 isdn_net_force_dial_lp(ISDN_SLAVE_PRIV(lp));
1100                                         }
1101                                 }
1102                         }
1103                 }
1104         } else {
1105                 if (lp->sqfull && time_after(jiffies, lp->sqfull_stamp + lp->slavedelay + (10 * HZ))) {
1106                         lp->sqfull = 0;
1107                 }
1108                 /* this is a hack to allow auto-hangup for slaves on moderate loads */
1109                 nd->queue = nd->local;
1110         }
1111
1112         return retv;
1113
1114 }
1115
1116 static void
1117 isdn_net_adjust_hdr(struct sk_buff *skb, struct net_device *dev)
1118 {
1119         isdn_net_local *lp = netdev_priv(dev);
1120         if (!skb)
1121                 return;
1122         if (lp->p_encap == ISDN_NET_ENCAP_ETHER) {
1123                 const int pullsize = skb_network_offset(skb) - ETH_HLEN;
1124                 if (pullsize > 0) {
1125                         printk(KERN_DEBUG "isdn_net: Pull junk %d\n", pullsize);
1126                         skb_pull(skb, pullsize);
1127                 }
1128         }
1129 }
1130
1131
1132 static void isdn_net_tx_timeout(struct net_device *ndev)
1133 {
1134         isdn_net_local *lp = netdev_priv(ndev);
1135
1136         printk(KERN_WARNING "isdn_tx_timeout dev %s dialstate %d\n", ndev->name, lp->dialstate);
1137         if (!lp->dialstate) {
1138                 lp->stats.tx_errors++;
1139                 /*
1140                  * There is a certain probability that this currently
1141                  * works at all because if we always wake up the interface,
1142                  * then upper layer will try to send the next packet
1143                  * immediately. And then, the old clean_up logic in the
1144                  * driver will hopefully continue to work as it used to do.
1145                  *
1146                  * This is rather primitive right know, we better should
1147                  * clean internal queues here, in particular for multilink and
1148                  * ppp, and reset HL driver's channel, too.   --HE
1149                  *
1150                  * actually, this may not matter at all, because ISDN hardware
1151                  * should not see transmitter hangs at all IMO
1152                  * changed KERN_DEBUG to KERN_WARNING to find out if this is
1153                  * ever called   --KG
1154                  */
1155         }
1156         netif_trans_update(ndev);
1157         netif_wake_queue(ndev);
1158 }
1159
1160 /*
1161  * Try sending a packet.
1162  * If this interface isn't connected to a ISDN-Channel, find a free channel,
1163  * and start dialing.
1164  */
1165 static netdev_tx_t
1166 isdn_net_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1167 {
1168         isdn_net_local *lp = netdev_priv(ndev);
1169 #ifdef CONFIG_ISDN_X25
1170         struct concap_proto *cprot = lp->netdev->cprot;
1171 /* At this point hard_start_xmit() passes control to the encapsulation
1172    protocol (if present).
1173    For X.25 auto-dialing is completly bypassed because:
1174    - It does not conform with the semantics of a reliable datalink
1175    service as needed by X.25 PLP.
1176    - I don't want that the interface starts dialing when the network layer
1177    sends a message which requests to disconnect the lapb link (or if it
1178    sends any other message not resulting in data transmission).
1179    Instead, dialing will be initiated by the encapsulation protocol entity
1180    when a dl_establish request is received from the upper layer.
1181 */
1182         if (cprot && cprot->pops) {
1183                 int ret = cprot->pops->encap_and_xmit(cprot, skb);
1184
1185                 if (ret)
1186                         netif_stop_queue(ndev);
1187                 return ret;
1188         } else
1189 #endif
1190                 /* auto-dialing xmit function */
1191         {
1192 #ifdef ISDN_DEBUG_NET_DUMP
1193                 u_char *buf;
1194 #endif
1195                 isdn_net_adjust_hdr(skb, ndev);
1196 #ifdef ISDN_DEBUG_NET_DUMP
1197                 buf = skb->data;
1198                 isdn_dumppkt("S:", buf, skb->len, 40);
1199 #endif
1200
1201                 if (!(lp->flags & ISDN_NET_CONNECTED)) {
1202                         int chi;
1203                         /* only do autodial if allowed by config */
1204                         if (!(ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_AUTO)) {
1205                                 isdn_net_unreachable(ndev, skb, "dial rejected: interface not in dialmode `auto'");
1206                                 dev_kfree_skb(skb);
1207                                 return NETDEV_TX_OK;
1208                         }
1209                         if (lp->phone[1]) {
1210                                 ulong flags;
1211
1212                                 if (lp->dialwait_timer <= 0)
1213                                         if (lp->dialstarted > 0 && lp->dialtimeout > 0 && time_before(jiffies, lp->dialstarted + lp->dialtimeout + lp->dialwait))
1214                                                 lp->dialwait_timer = lp->dialstarted + lp->dialtimeout + lp->dialwait;
1215
1216                                 if (lp->dialwait_timer > 0) {
1217                                         if (time_before(jiffies, lp->dialwait_timer)) {
1218                                                 isdn_net_unreachable(ndev, skb, "dial rejected: retry-time not reached");
1219                                                 dev_kfree_skb(skb);
1220                                                 return NETDEV_TX_OK;
1221                                         } else
1222                                                 lp->dialwait_timer = 0;
1223                                 }
1224                                 /* Grab a free ISDN-Channel */
1225                                 spin_lock_irqsave(&dev->lock, flags);
1226                                 if (((chi =
1227                                       isdn_get_free_channel(
1228                                               ISDN_USAGE_NET,
1229                                               lp->l2_proto,
1230                                               lp->l3_proto,
1231                                               lp->pre_device,
1232                                               lp->pre_channel,
1233                                               lp->msn)
1234                                              ) < 0) &&
1235                                     ((chi =
1236                                       isdn_get_free_channel(
1237                                               ISDN_USAGE_NET,
1238                                               lp->l2_proto,
1239                                               lp->l3_proto,
1240                                               lp->pre_device,
1241                                               lp->pre_channel^1,
1242                                               lp->msn)
1243                                             ) < 0)) {
1244                                         spin_unlock_irqrestore(&dev->lock, flags);
1245                                         isdn_net_unreachable(ndev, skb,
1246                                                              "No channel");
1247                                         dev_kfree_skb(skb);
1248                                         return NETDEV_TX_OK;
1249                                 }
1250                                 /* Log packet, which triggered dialing */
1251                                 if (dev->net_verbose)
1252                                         isdn_net_log_skb(skb, lp);
1253                                 lp->dialstate = 1;
1254                                 /* Connect interface with channel */
1255                                 isdn_net_bind_channel(lp, chi);
1256 #ifdef CONFIG_ISDN_PPP
1257                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
1258                                         /* no 'first_skb' handling for syncPPP */
1259                                         if (isdn_ppp_bind(lp) < 0) {
1260                                                 dev_kfree_skb(skb);
1261                                                 isdn_net_unbind_channel(lp);
1262                                                 spin_unlock_irqrestore(&dev->lock, flags);
1263                                                 return NETDEV_TX_OK;    /* STN (skb to nirvana) ;) */
1264                                         }
1265 #ifdef CONFIG_IPPP_FILTER
1266                                         if (isdn_ppp_autodial_filter(skb, lp)) {
1267                                                 isdn_ppp_free(lp);
1268                                                 isdn_net_unbind_channel(lp);
1269                                                 spin_unlock_irqrestore(&dev->lock, flags);
1270                                                 isdn_net_unreachable(ndev, skb, "dial rejected: packet filtered");
1271                                                 dev_kfree_skb(skb);
1272                                                 return NETDEV_TX_OK;
1273                                         }
1274 #endif
1275                                         spin_unlock_irqrestore(&dev->lock, flags);
1276                                         isdn_net_dial();        /* Initiate dialing */
1277                                         netif_stop_queue(ndev);
1278                                         return NETDEV_TX_BUSY;  /* let upper layer requeue skb packet */
1279                                 }
1280 #endif
1281                                 /* Initiate dialing */
1282                                 spin_unlock_irqrestore(&dev->lock, flags);
1283                                 isdn_net_dial();
1284                                 isdn_net_device_stop_queue(lp);
1285                                 return NETDEV_TX_BUSY;
1286                         } else {
1287                                 isdn_net_unreachable(ndev, skb,
1288                                                      "No phone number");
1289                                 dev_kfree_skb(skb);
1290                                 return NETDEV_TX_OK;
1291                         }
1292                 } else {
1293                         /* Device is connected to an ISDN channel */
1294                         netif_trans_update(ndev);
1295                         if (!lp->dialstate) {
1296                                 /* ISDN connection is established, try sending */
1297                                 int ret;
1298                                 ret = (isdn_net_xmit(ndev, skb));
1299                                 if (ret) netif_stop_queue(ndev);
1300                                 return ret;
1301                         } else
1302                                 netif_stop_queue(ndev);
1303                 }
1304         }
1305         return NETDEV_TX_BUSY;
1306 }
1307
1308 /*
1309  * Shutdown a net-interface.
1310  */
1311 static int
1312 isdn_net_close(struct net_device *dev)
1313 {
1314         struct net_device *p;
1315 #ifdef CONFIG_ISDN_X25
1316         struct concap_proto *cprot =
1317                 ((isdn_net_local *)netdev_priv(dev))->netdev->cprot;
1318         /* printk(KERN_DEBUG "isdn_net_close %s\n" , dev-> name); */
1319 #endif
1320
1321 #ifdef CONFIG_ISDN_X25
1322         if (cprot && cprot->pops) cprot->pops->close(cprot);
1323 #endif
1324         netif_stop_queue(dev);
1325         p = MASTER_TO_SLAVE(dev);
1326         if (p) {
1327                 /* If this interface has slaves, stop them also */
1328                 while (p) {
1329 #ifdef CONFIG_ISDN_X25
1330                         cprot = ((isdn_net_local *)netdev_priv(p))
1331                                 ->netdev->cprot;
1332                         if (cprot && cprot->pops)
1333                                 cprot->pops->close(cprot);
1334 #endif
1335                         isdn_net_hangup(p);
1336                         p = MASTER_TO_SLAVE(p);
1337                 }
1338         }
1339         isdn_net_hangup(dev);
1340         isdn_unlock_drivers();
1341         return 0;
1342 }
1343
1344 /*
1345  * Get statistics
1346  */
1347 static struct net_device_stats *
1348 isdn_net_get_stats(struct net_device *dev)
1349 {
1350         isdn_net_local *lp = netdev_priv(dev);
1351         return &lp->stats;
1352 }
1353
1354 /*      This is simply a copy from std. eth.c EXCEPT we pull ETH_HLEN
1355  *      instead of dev->hard_header_len off. This is done because the
1356  *      lowlevel-driver has already pulled off its stuff when we get
1357  *      here and this routine only gets called with p_encap == ETHER.
1358  *      Determine the packet's protocol ID. The rule here is that we
1359  *      assume 802.3 if the type field is short enough to be a length.
1360  *      This is normal practice and works for any 'now in use' protocol.
1361  */
1362
1363 static __be16
1364 isdn_net_type_trans(struct sk_buff *skb, struct net_device *dev)
1365 {
1366         struct ethhdr *eth;
1367         unsigned char *rawp;
1368
1369         skb_reset_mac_header(skb);
1370         skb_pull(skb, ETH_HLEN);
1371         eth = eth_hdr(skb);
1372
1373         if (*eth->h_dest & 1) {
1374                 if (ether_addr_equal(eth->h_dest, dev->broadcast))
1375                         skb->pkt_type = PACKET_BROADCAST;
1376                 else
1377                         skb->pkt_type = PACKET_MULTICAST;
1378         }
1379         /*
1380          *      This ALLMULTI check should be redundant by 1.4
1381          *      so don't forget to remove it.
1382          */
1383
1384         else if (dev->flags & (IFF_PROMISC /*| IFF_ALLMULTI*/)) {
1385                 if (!ether_addr_equal(eth->h_dest, dev->dev_addr))
1386                         skb->pkt_type = PACKET_OTHERHOST;
1387         }
1388         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
1389                 return eth->h_proto;
1390
1391         rawp = skb->data;
1392
1393         /*
1394          *      This is a magic hack to spot IPX packets. Older Novell breaks
1395          *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
1396          *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
1397          *      won't work for fault tolerant netware but does for the rest.
1398          */
1399         if (*(unsigned short *) rawp == 0xFFFF)
1400                 return htons(ETH_P_802_3);
1401         /*
1402          *      Real 802.2 LLC
1403          */
1404         return htons(ETH_P_802_2);
1405 }
1406
1407
1408 /*
1409  * CISCO HDLC keepalive specific stuff
1410  */
1411 static struct sk_buff*
1412 isdn_net_ciscohdlck_alloc_skb(isdn_net_local *lp, int len)
1413 {
1414         unsigned short hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen;
1415         struct sk_buff *skb;
1416
1417         skb = alloc_skb(hl + len, GFP_ATOMIC);
1418         if (skb)
1419                 skb_reserve(skb, hl);
1420         else
1421                 printk("isdn out of mem at %s:%d!\n", __FILE__, __LINE__);
1422         return skb;
1423 }
1424
1425 /* cisco hdlck device private ioctls */
1426 static int
1427 isdn_ciscohdlck_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1428 {
1429         isdn_net_local *lp = netdev_priv(dev);
1430         unsigned long len = 0;
1431         unsigned long expires = 0;
1432         int tmp = 0;
1433         int period = lp->cisco_keepalive_period;
1434         s8 debserint = lp->cisco_debserint;
1435         int rc = 0;
1436
1437         if (lp->p_encap != ISDN_NET_ENCAP_CISCOHDLCK)
1438                 return -EINVAL;
1439
1440         switch (cmd) {
1441                 /* get/set keepalive period */
1442         case SIOCGKEEPPERIOD:
1443                 len = (unsigned long)sizeof(lp->cisco_keepalive_period);
1444                 if (copy_to_user(ifr->ifr_data,
1445                                  &lp->cisco_keepalive_period, len))
1446                         rc = -EFAULT;
1447                 break;
1448         case SIOCSKEEPPERIOD:
1449                 tmp = lp->cisco_keepalive_period;
1450                 len = (unsigned long)sizeof(lp->cisco_keepalive_period);
1451                 if (copy_from_user(&period, ifr->ifr_data, len))
1452                         rc = -EFAULT;
1453                 if ((period > 0) && (period <= 32767))
1454                         lp->cisco_keepalive_period = period;
1455                 else
1456                         rc = -EINVAL;
1457                 if (!rc && (tmp != lp->cisco_keepalive_period)) {
1458                         expires = (unsigned long)(jiffies +
1459                                                   lp->cisco_keepalive_period * HZ);
1460                         mod_timer(&lp->cisco_timer, expires);
1461                         printk(KERN_INFO "%s: Keepalive period set "
1462                                "to %d seconds.\n",
1463                                dev->name, lp->cisco_keepalive_period);
1464                 }
1465                 break;
1466
1467                 /* get/set debugging */
1468         case SIOCGDEBSERINT:
1469                 len = (unsigned long)sizeof(lp->cisco_debserint);
1470                 if (copy_to_user(ifr->ifr_data,
1471                                  &lp->cisco_debserint, len))
1472                         rc = -EFAULT;
1473                 break;
1474         case SIOCSDEBSERINT:
1475                 len = (unsigned long)sizeof(lp->cisco_debserint);
1476                 if (copy_from_user(&debserint,
1477                                    ifr->ifr_data, len))
1478                         rc = -EFAULT;
1479                 if ((debserint >= 0) && (debserint <= 64))
1480                         lp->cisco_debserint = debserint;
1481                 else
1482                         rc = -EINVAL;
1483                 break;
1484
1485         default:
1486                 rc = -EINVAL;
1487                 break;
1488         }
1489         return (rc);
1490 }
1491
1492
1493 static int isdn_net_ioctl(struct net_device *dev,
1494                           struct ifreq *ifr, int cmd)
1495 {
1496         isdn_net_local *lp = netdev_priv(dev);
1497
1498         switch (lp->p_encap) {
1499 #ifdef CONFIG_ISDN_PPP
1500         case ISDN_NET_ENCAP_SYNCPPP:
1501                 return isdn_ppp_dev_ioctl(dev, ifr, cmd);
1502 #endif
1503         case ISDN_NET_ENCAP_CISCOHDLCK:
1504                 return isdn_ciscohdlck_dev_ioctl(dev, ifr, cmd);
1505         default:
1506                 return -EINVAL;
1507         }
1508 }
1509
1510 /* called via cisco_timer.function */
1511 static void
1512 isdn_net_ciscohdlck_slarp_send_keepalive(unsigned long data)
1513 {
1514         isdn_net_local *lp = (isdn_net_local *) data;
1515         struct sk_buff *skb;
1516         unsigned char *p;
1517         unsigned long last_cisco_myseq = lp->cisco_myseq;
1518         int myseq_diff = 0;
1519
1520         if (!(lp->flags & ISDN_NET_CONNECTED) || lp->dialstate) {
1521                 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__);
1522                 return;
1523         }
1524         lp->cisco_myseq++;
1525
1526         myseq_diff = (lp->cisco_myseq - lp->cisco_mineseen);
1527         if ((lp->cisco_line_state) && ((myseq_diff >= 3) || (myseq_diff <= -3))) {
1528                 /* line up -> down */
1529                 lp->cisco_line_state = 0;
1530                 printk(KERN_WARNING
1531                        "UPDOWN: Line protocol on Interface %s,"
1532                        " changed state to down\n", lp->netdev->dev->name);
1533                 /* should stop routing higher-level data across */
1534         } else if ((!lp->cisco_line_state) &&
1535                    (myseq_diff >= 0) && (myseq_diff <= 2)) {
1536                 /* line down -> up */
1537                 lp->cisco_line_state = 1;
1538                 printk(KERN_WARNING
1539                        "UPDOWN: Line protocol on Interface %s,"
1540                        " changed state to up\n", lp->netdev->dev->name);
1541                 /* restart routing higher-level data across */
1542         }
1543
1544         if (lp->cisco_debserint)
1545                 printk(KERN_DEBUG "%s: HDLC "
1546                        "myseq %lu, mineseen %lu%c, yourseen %lu, %s\n",
1547                        lp->netdev->dev->name, last_cisco_myseq, lp->cisco_mineseen,
1548                        ((last_cisco_myseq == lp->cisco_mineseen) ? '*' : 040),
1549                        lp->cisco_yourseq,
1550                        ((lp->cisco_line_state) ? "line up" : "line down"));
1551
1552         skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14);
1553         if (!skb)
1554                 return;
1555
1556         p = skb_put(skb, 4 + 14);
1557
1558         /* cisco header */
1559         *(u8 *)(p + 0) = CISCO_ADDR_UNICAST;
1560         *(u8 *)(p + 1) = CISCO_CTRL;
1561         *(__be16 *)(p + 2) = cpu_to_be16(CISCO_TYPE_SLARP);
1562
1563         /* slarp keepalive */
1564         *(__be32 *)(p +  4) = cpu_to_be32(CISCO_SLARP_KEEPALIVE);
1565         *(__be32 *)(p +  8) = cpu_to_be32(lp->cisco_myseq);
1566         *(__be32 *)(p + 12) = cpu_to_be32(lp->cisco_yourseq);
1567         *(__be16 *)(p + 16) = cpu_to_be16(0xffff); // reliability, always 0xffff
1568         p += 18;
1569
1570         isdn_net_write_super(lp, skb);
1571
1572         lp->cisco_timer.expires = jiffies + lp->cisco_keepalive_period * HZ;
1573
1574         add_timer(&lp->cisco_timer);
1575 }
1576
1577 static void
1578 isdn_net_ciscohdlck_slarp_send_request(isdn_net_local *lp)
1579 {
1580         struct sk_buff *skb;
1581         unsigned char *p;
1582
1583         skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14);
1584         if (!skb)
1585                 return;
1586
1587         p = skb_put(skb, 4 + 14);
1588
1589         /* cisco header */
1590         *(u8 *)(p + 0) = CISCO_ADDR_UNICAST;
1591         *(u8 *)(p + 1) = CISCO_CTRL;
1592         *(__be16 *)(p + 2) = cpu_to_be16(CISCO_TYPE_SLARP);
1593
1594         /* slarp request */
1595         *(__be32 *)(p +  4) = cpu_to_be32(CISCO_SLARP_REQUEST);
1596         *(__be32 *)(p +  8) = cpu_to_be32(0); // address
1597         *(__be32 *)(p + 12) = cpu_to_be32(0); // netmask
1598         *(__be16 *)(p + 16) = cpu_to_be16(0); // unused
1599         p += 18;
1600
1601         isdn_net_write_super(lp, skb);
1602 }
1603
1604 static void
1605 isdn_net_ciscohdlck_connected(isdn_net_local *lp)
1606 {
1607         lp->cisco_myseq = 0;
1608         lp->cisco_mineseen = 0;
1609         lp->cisco_yourseq = 0;
1610         lp->cisco_keepalive_period = ISDN_TIMER_KEEPINT;
1611         lp->cisco_last_slarp_in = 0;
1612         lp->cisco_line_state = 0;
1613         lp->cisco_debserint = 0;
1614
1615         /* send slarp request because interface/seq.no.s reset */
1616         isdn_net_ciscohdlck_slarp_send_request(lp);
1617
1618         init_timer(&lp->cisco_timer);
1619         lp->cisco_timer.data = (unsigned long) lp;
1620         lp->cisco_timer.function = isdn_net_ciscohdlck_slarp_send_keepalive;
1621         lp->cisco_timer.expires = jiffies + lp->cisco_keepalive_period * HZ;
1622         add_timer(&lp->cisco_timer);
1623 }
1624
1625 static void
1626 isdn_net_ciscohdlck_disconnected(isdn_net_local *lp)
1627 {
1628         del_timer(&lp->cisco_timer);
1629 }
1630
1631 static void
1632 isdn_net_ciscohdlck_slarp_send_reply(isdn_net_local *lp)
1633 {
1634         struct sk_buff *skb;
1635         unsigned char *p;
1636         struct in_device *in_dev = NULL;
1637         __be32 addr = 0;                /* local ipv4 address */
1638         __be32 mask = 0;                /* local netmask */
1639
1640         if ((in_dev = lp->netdev->dev->ip_ptr) != NULL) {
1641                 /* take primary(first) address of interface */
1642                 struct in_ifaddr *ifa = in_dev->ifa_list;
1643                 if (ifa != NULL) {
1644                         addr = ifa->ifa_local;
1645                         mask = ifa->ifa_mask;
1646                 }
1647         }
1648
1649         skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14);
1650         if (!skb)
1651                 return;
1652
1653         p = skb_put(skb, 4 + 14);
1654
1655         /* cisco header */
1656         *(u8 *)(p + 0) = CISCO_ADDR_UNICAST;
1657         *(u8 *)(p + 1) = CISCO_CTRL;
1658         *(__be16 *)(p + 2) = cpu_to_be16(CISCO_TYPE_SLARP);
1659
1660         /* slarp reply, send own ip/netmask; if values are nonsense remote
1661          * should think we are unable to provide it with an address via SLARP */
1662         *(__be32 *)(p +  4) = cpu_to_be32(CISCO_SLARP_REPLY);
1663         *(__be32 *)(p +  8) = addr; // address
1664         *(__be32 *)(p + 12) = mask; // netmask
1665         *(__be16 *)(p + 16) = cpu_to_be16(0); // unused
1666         p += 18;
1667
1668         isdn_net_write_super(lp, skb);
1669 }
1670
1671 static void
1672 isdn_net_ciscohdlck_slarp_in(isdn_net_local *lp, struct sk_buff *skb)
1673 {
1674         unsigned char *p;
1675         int period;
1676         u32 code;
1677         u32 my_seq;
1678         u32 your_seq;
1679         __be32 local;
1680         __be32 *addr, *mask;
1681
1682         if (skb->len < 14)
1683                 return;
1684
1685         p = skb->data;
1686         code = be32_to_cpup((__be32 *)p);
1687         p += 4;
1688
1689         switch (code) {
1690         case CISCO_SLARP_REQUEST:
1691                 lp->cisco_yourseq = 0;
1692                 isdn_net_ciscohdlck_slarp_send_reply(lp);
1693                 break;
1694         case CISCO_SLARP_REPLY:
1695                 addr = (__be32 *)p;
1696                 mask = (__be32 *)(p + 4);
1697                 if (*mask != cpu_to_be32(0xfffffffc))
1698                         goto slarp_reply_out;
1699                 if ((*addr & cpu_to_be32(3)) == cpu_to_be32(0) ||
1700                     (*addr & cpu_to_be32(3)) == cpu_to_be32(3))
1701                         goto slarp_reply_out;
1702                 local = *addr ^ cpu_to_be32(3);
1703                 printk(KERN_INFO "%s: got slarp reply: remote ip: %pI4, local ip: %pI4 mask: %pI4\n",
1704                        lp->netdev->dev->name, addr, &local, mask);
1705                 break;
1706         slarp_reply_out:
1707                 printk(KERN_INFO "%s: got invalid slarp reply (%pI4/%pI4) - ignored\n",
1708                        lp->netdev->dev->name, addr, mask);
1709                 break;
1710         case CISCO_SLARP_KEEPALIVE:
1711                 period = (int)((jiffies - lp->cisco_last_slarp_in
1712                                 + HZ / 2 - 1) / HZ);
1713                 if (lp->cisco_debserint &&
1714                     (period != lp->cisco_keepalive_period) &&
1715                     lp->cisco_last_slarp_in) {
1716                         printk(KERN_DEBUG "%s: Keepalive period mismatch - "
1717                                "is %d but should be %d.\n",
1718                                lp->netdev->dev->name, period,
1719                                lp->cisco_keepalive_period);
1720                 }
1721                 lp->cisco_last_slarp_in = jiffies;
1722                 my_seq = be32_to_cpup((__be32 *)(p + 0));
1723                 your_seq = be32_to_cpup((__be32 *)(p + 4));
1724                 p += 10;
1725                 lp->cisco_yourseq = my_seq;
1726                 lp->cisco_mineseen = your_seq;
1727                 break;
1728         }
1729 }
1730
1731 static void
1732 isdn_net_ciscohdlck_receive(isdn_net_local *lp, struct sk_buff *skb)
1733 {
1734         unsigned char *p;
1735         u8 addr;
1736         u8 ctrl;
1737         u16 type;
1738
1739         if (skb->len < 4)
1740                 goto out_free;
1741
1742         p = skb->data;
1743         addr = *(u8 *)(p + 0);
1744         ctrl = *(u8 *)(p + 1);
1745         type = be16_to_cpup((__be16 *)(p + 2));
1746         p += 4;
1747         skb_pull(skb, 4);
1748
1749         if (addr != CISCO_ADDR_UNICAST && addr != CISCO_ADDR_BROADCAST) {
1750                 printk(KERN_WARNING "%s: Unknown Cisco addr 0x%02x\n",
1751                        lp->netdev->dev->name, addr);
1752                 goto out_free;
1753         }
1754         if (ctrl != CISCO_CTRL) {
1755                 printk(KERN_WARNING "%s: Unknown Cisco ctrl 0x%02x\n",
1756                        lp->netdev->dev->name, ctrl);
1757                 goto out_free;
1758         }
1759
1760         switch (type) {
1761         case CISCO_TYPE_SLARP:
1762                 isdn_net_ciscohdlck_slarp_in(lp, skb);
1763                 goto out_free;
1764         case CISCO_TYPE_CDP:
1765                 if (lp->cisco_debserint)
1766                         printk(KERN_DEBUG "%s: Received CDP packet. use "
1767                                "\"no cdp enable\" on cisco.\n",
1768                                lp->netdev->dev->name);
1769                 goto out_free;
1770         default:
1771                 /* no special cisco protocol */
1772                 skb->protocol = htons(type);
1773                 netif_rx(skb);
1774                 return;
1775         }
1776
1777 out_free:
1778         kfree_skb(skb);
1779 }
1780
1781 /*
1782  * Got a packet from ISDN-Channel.
1783  */
1784 static void
1785 isdn_net_receive(struct net_device *ndev, struct sk_buff *skb)
1786 {
1787         isdn_net_local *lp = netdev_priv(ndev);
1788         isdn_net_local *olp = lp;       /* original 'lp' */
1789 #ifdef CONFIG_ISDN_X25
1790         struct concap_proto *cprot = lp->netdev->cprot;
1791 #endif
1792         lp->transcount += skb->len;
1793
1794         lp->stats.rx_packets++;
1795         lp->stats.rx_bytes += skb->len;
1796         if (lp->master) {
1797                 /* Bundling: If device is a slave-device, deliver to master, also
1798                  * handle master's statistics and hangup-timeout
1799                  */
1800                 ndev = lp->master;
1801                 lp = netdev_priv(ndev);
1802                 lp->stats.rx_packets++;
1803                 lp->stats.rx_bytes += skb->len;
1804         }
1805         skb->dev = ndev;
1806         skb->pkt_type = PACKET_HOST;
1807         skb_reset_mac_header(skb);
1808 #ifdef ISDN_DEBUG_NET_DUMP
1809         isdn_dumppkt("R:", skb->data, skb->len, 40);
1810 #endif
1811         switch (lp->p_encap) {
1812         case ISDN_NET_ENCAP_ETHER:
1813                 /* Ethernet over ISDN */
1814                 olp->huptimer = 0;
1815                 lp->huptimer = 0;
1816                 skb->protocol = isdn_net_type_trans(skb, ndev);
1817                 break;
1818         case ISDN_NET_ENCAP_UIHDLC:
1819                 /* HDLC with UI-frame (for ispa with -h1 option) */
1820                 olp->huptimer = 0;
1821                 lp->huptimer = 0;
1822                 skb_pull(skb, 2);
1823                 /* Fall through */
1824         case ISDN_NET_ENCAP_RAWIP:
1825                 /* RAW-IP without MAC-Header */
1826                 olp->huptimer = 0;
1827                 lp->huptimer = 0;
1828                 skb->protocol = htons(ETH_P_IP);
1829                 break;
1830         case ISDN_NET_ENCAP_CISCOHDLCK:
1831                 isdn_net_ciscohdlck_receive(lp, skb);
1832                 return;
1833         case ISDN_NET_ENCAP_CISCOHDLC:
1834                 /* CISCO-HDLC IP with type field and  fake I-frame-header */
1835                 skb_pull(skb, 2);
1836                 /* Fall through */
1837         case ISDN_NET_ENCAP_IPTYP:
1838                 /* IP with type field */
1839                 olp->huptimer = 0;
1840                 lp->huptimer = 0;
1841                 skb->protocol = *(__be16 *)&(skb->data[0]);
1842                 skb_pull(skb, 2);
1843                 if (*(unsigned short *) skb->data == 0xFFFF)
1844                         skb->protocol = htons(ETH_P_802_3);
1845                 break;
1846 #ifdef CONFIG_ISDN_PPP
1847         case ISDN_NET_ENCAP_SYNCPPP:
1848                 /* huptimer is done in isdn_ppp_push_higher */
1849                 isdn_ppp_receive(lp->netdev, olp, skb);
1850                 return;
1851 #endif
1852
1853         default:
1854 #ifdef CONFIG_ISDN_X25
1855                 /* try if there are generic sync_device receiver routines */
1856                 if (cprot) if (cprot->pops)
1857                                    if (cprot->pops->data_ind) {
1858                                            cprot->pops->data_ind(cprot, skb);
1859                                            return;
1860                                    };
1861 #endif /* CONFIG_ISDN_X25 */
1862                 printk(KERN_WARNING "%s: unknown encapsulation, dropping\n",
1863                        lp->netdev->dev->name);
1864                 kfree_skb(skb);
1865                 return;
1866         }
1867
1868         netif_rx(skb);
1869         return;
1870 }
1871
1872 /*
1873  * A packet arrived via ISDN. Search interface-chain for a corresponding
1874  * interface. If found, deliver packet to receiver-function and return 1,
1875  * else return 0.
1876  */
1877 int
1878 isdn_net_rcv_skb(int idx, struct sk_buff *skb)
1879 {
1880         isdn_net_dev *p = dev->rx_netdev[idx];
1881
1882         if (p) {
1883                 isdn_net_local *lp = p->local;
1884                 if ((lp->flags & ISDN_NET_CONNECTED) &&
1885                     (!lp->dialstate)) {
1886                         isdn_net_receive(p->dev, skb);
1887                         return 1;
1888                 }
1889         }
1890         return 0;
1891 }
1892
1893 /*
1894  *  build an header
1895  *  depends on encaps that is being used.
1896  */
1897
1898 static int isdn_net_header(struct sk_buff *skb, struct net_device *dev,
1899                            unsigned short type,
1900                            const void *daddr, const void *saddr, unsigned plen)
1901 {
1902         isdn_net_local *lp = netdev_priv(dev);
1903         unsigned char *p;
1904         int len = 0;
1905
1906         switch (lp->p_encap) {
1907         case ISDN_NET_ENCAP_ETHER:
1908                 len = eth_header(skb, dev, type, daddr, saddr, plen);
1909                 break;
1910 #ifdef CONFIG_ISDN_PPP
1911         case ISDN_NET_ENCAP_SYNCPPP:
1912                 /* stick on a fake header to keep fragmentation code happy. */
1913                 len = IPPP_MAX_HEADER;
1914                 skb_push(skb, len);
1915                 break;
1916 #endif
1917         case ISDN_NET_ENCAP_RAWIP:
1918                 printk(KERN_WARNING "isdn_net_header called with RAW_IP!\n");
1919                 len = 0;
1920                 break;
1921         case ISDN_NET_ENCAP_IPTYP:
1922                 /* ethernet type field */
1923                 *((__be16 *)skb_push(skb, 2)) = htons(type);
1924                 len = 2;
1925                 break;
1926         case ISDN_NET_ENCAP_UIHDLC:
1927                 /* HDLC with UI-Frames (for ispa with -h1 option) */
1928                 *((__be16 *)skb_push(skb, 2)) = htons(0x0103);
1929                 len = 2;
1930                 break;
1931         case ISDN_NET_ENCAP_CISCOHDLC:
1932         case ISDN_NET_ENCAP_CISCOHDLCK:
1933                 p = skb_push(skb, 4);
1934                 *(u8 *)(p + 0) = CISCO_ADDR_UNICAST;
1935                 *(u8 *)(p + 1) = CISCO_CTRL;
1936                 *(__be16 *)(p + 2) = cpu_to_be16(type);
1937                 p += 4;
1938                 len = 4;
1939                 break;
1940 #ifdef CONFIG_ISDN_X25
1941         default:
1942                 /* try if there are generic concap protocol routines */
1943                 if (lp->netdev->cprot) {
1944                         printk(KERN_WARNING "isdn_net_header called with concap_proto!\n");
1945                         len = 0;
1946                         break;
1947                 }
1948                 break;
1949 #endif /* CONFIG_ISDN_X25 */
1950         }
1951         return len;
1952 }
1953
1954 static int isdn_header_cache(const struct neighbour *neigh, struct hh_cache *hh,
1955                              __be16 type)
1956 {
1957         const struct net_device *dev = neigh->dev;
1958         isdn_net_local *lp = netdev_priv(dev);
1959
1960         if (lp->p_encap == ISDN_NET_ENCAP_ETHER)
1961                 return eth_header_cache(neigh, hh, type);
1962         return -1;
1963 }
1964
1965 static void isdn_header_cache_update(struct hh_cache *hh,
1966                                      const struct net_device *dev,
1967                                      const unsigned char *haddr)
1968 {
1969         isdn_net_local *lp = netdev_priv(dev);
1970         if (lp->p_encap == ISDN_NET_ENCAP_ETHER)
1971                 eth_header_cache_update(hh, dev, haddr);
1972 }
1973
1974 static const struct header_ops isdn_header_ops = {
1975         .create = isdn_net_header,
1976         .cache = isdn_header_cache,
1977         .cache_update = isdn_header_cache_update,
1978 };
1979
1980 /*
1981  * Interface-setup. (just after registering a new interface)
1982  */
1983 static int
1984 isdn_net_init(struct net_device *ndev)
1985 {
1986         ushort max_hlhdr_len = 0;
1987         int drvidx;
1988
1989         /*
1990          *  up till binding we ask the protocol layer to reserve as much
1991          *  as we might need for HL layer
1992          */
1993
1994         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
1995                 if (dev->drv[drvidx])
1996                         if (max_hlhdr_len < dev->drv[drvidx]->interface->hl_hdrlen)
1997                                 max_hlhdr_len = dev->drv[drvidx]->interface->hl_hdrlen;
1998
1999         ndev->hard_header_len = ETH_HLEN + max_hlhdr_len;
2000         return 0;
2001 }
2002
2003 static void
2004 isdn_net_swapbind(int drvidx)
2005 {
2006         isdn_net_dev *p;
2007
2008 #ifdef ISDN_DEBUG_NET_ICALL
2009         printk(KERN_DEBUG "n_fi: swapping ch of %d\n", drvidx);
2010 #endif
2011         p = dev->netdev;
2012         while (p) {
2013                 if (p->local->pre_device == drvidx)
2014                         switch (p->local->pre_channel) {
2015                         case 0:
2016                                 p->local->pre_channel = 1;
2017                                 break;
2018                         case 1:
2019                                 p->local->pre_channel = 0;
2020                                 break;
2021                         }
2022                 p = (isdn_net_dev *) p->next;
2023         }
2024 }
2025
2026 static void
2027 isdn_net_swap_usage(int i1, int i2)
2028 {
2029         int u1 = dev->usage[i1] & ISDN_USAGE_EXCLUSIVE;
2030         int u2 = dev->usage[i2] & ISDN_USAGE_EXCLUSIVE;
2031
2032 #ifdef ISDN_DEBUG_NET_ICALL
2033         printk(KERN_DEBUG "n_fi: usage of %d and %d\n", i1, i2);
2034 #endif
2035         dev->usage[i1] &= ~ISDN_USAGE_EXCLUSIVE;
2036         dev->usage[i1] |= u2;
2037         dev->usage[i2] &= ~ISDN_USAGE_EXCLUSIVE;
2038         dev->usage[i2] |= u1;
2039         isdn_info_update();
2040 }
2041
2042 /*
2043  * An incoming call-request has arrived.
2044  * Search the interface-chain for an appropriate interface.
2045  * If found, connect the interface to the ISDN-channel and initiate
2046  * D- and B-Channel-setup. If secure-flag is set, accept only
2047  * configured phone-numbers. If callback-flag is set, initiate
2048  * callback-dialing.
2049  *
2050  * Return-Value: 0 = No appropriate interface for this call.
2051  *               1 = Call accepted
2052  *               2 = Reject call, wait cbdelay, then call back
2053  *               3 = Reject call
2054  *               4 = Wait cbdelay, then call back
2055  *               5 = No appropriate interface for this call,
2056  *                   would eventually match if CID was longer.
2057  */
2058
2059 int
2060 isdn_net_find_icall(int di, int ch, int idx, setup_parm *setup)
2061 {
2062         char *eaz;
2063         int si1;
2064         int si2;
2065         int ematch;
2066         int wret;
2067         int swapped;
2068         int sidx = 0;
2069         u_long flags;
2070         isdn_net_dev *p;
2071         isdn_net_phone *n;
2072         char nr[ISDN_MSNLEN];
2073         char *my_eaz;
2074
2075         /* Search name in netdev-chain */
2076         if (!setup->phone[0]) {
2077                 nr[0] = '0';
2078                 nr[1] = '\0';
2079                 printk(KERN_INFO "isdn_net: Incoming call without OAD, assuming '0'\n");
2080         } else
2081                 strlcpy(nr, setup->phone, ISDN_MSNLEN);
2082         si1 = (int) setup->si1;
2083         si2 = (int) setup->si2;
2084         if (!setup->eazmsn[0]) {
2085                 printk(KERN_WARNING "isdn_net: Incoming call without CPN, assuming '0'\n");
2086                 eaz = "0";
2087         } else
2088                 eaz = setup->eazmsn;
2089         if (dev->net_verbose > 1)
2090                 printk(KERN_INFO "isdn_net: call from %s,%d,%d -> %s\n", nr, si1, si2, eaz);
2091         /* Accept DATA and VOICE calls at this stage
2092          * local eaz is checked later for allowed call types
2093          */
2094         if ((si1 != 7) && (si1 != 1)) {
2095                 if (dev->net_verbose > 1)
2096                         printk(KERN_INFO "isdn_net: Service-Indicator not 1 or 7, ignored\n");
2097                 return 0;
2098         }
2099         n = (isdn_net_phone *) 0;
2100         p = dev->netdev;
2101         ematch = wret = swapped = 0;
2102 #ifdef ISDN_DEBUG_NET_ICALL
2103         printk(KERN_DEBUG "n_fi: di=%d ch=%d idx=%d usg=%d\n", di, ch, idx,
2104                dev->usage[idx]);
2105 #endif
2106         while (p) {
2107                 int matchret;
2108                 isdn_net_local *lp = p->local;
2109
2110                 /* If last check has triggered as binding-swap, revert it */
2111                 switch (swapped) {
2112                 case 2:
2113                         isdn_net_swap_usage(idx, sidx);
2114                         /* fall through */
2115                 case 1:
2116                         isdn_net_swapbind(di);
2117                         break;
2118                 }
2119                 swapped = 0;
2120                 /* check acceptable call types for DOV */
2121                 my_eaz = isdn_map_eaz2msn(lp->msn, di);
2122                 if (si1 == 1) { /* it's a DOV call, check if we allow it */
2123                         if (*my_eaz == 'v' || *my_eaz == 'V' ||
2124                             *my_eaz == 'b' || *my_eaz == 'B')
2125                                 my_eaz++; /* skip to allow a match */
2126                         else
2127                                 my_eaz = NULL; /* force non match */
2128                 } else { /* it's a DATA call, check if we allow it */
2129                         if (*my_eaz == 'b' || *my_eaz == 'B')
2130                                 my_eaz++; /* skip to allow a match */
2131                 }
2132                 if (my_eaz)
2133                         matchret = isdn_msncmp(eaz, my_eaz);
2134                 else
2135                         matchret = 1;
2136                 if (!matchret)
2137                         ematch = 1;
2138
2139                 /* Remember if more numbers eventually can match */
2140                 if (matchret > wret)
2141                         wret = matchret;
2142 #ifdef ISDN_DEBUG_NET_ICALL
2143                 printk(KERN_DEBUG "n_fi: if='%s', l.msn=%s, l.flags=%d, l.dstate=%d\n",
2144                        p->dev->name, lp->msn, lp->flags, lp->dialstate);
2145 #endif
2146                 if ((!matchret) &&                                        /* EAZ is matching   */
2147                     (((!(lp->flags & ISDN_NET_CONNECTED)) &&              /* but not connected */
2148                       (USG_NONE(dev->usage[idx]))) ||                     /* and ch. unused or */
2149                      ((((lp->dialstate == 4) || (lp->dialstate == 12)) && /* if dialing        */
2150                        (!(lp->flags & ISDN_NET_CALLBACK)))                /* but no callback   */
2151                              )))
2152                 {
2153 #ifdef ISDN_DEBUG_NET_ICALL
2154                         printk(KERN_DEBUG "n_fi: match1, pdev=%d pch=%d\n",
2155                                lp->pre_device, lp->pre_channel);
2156 #endif
2157                         if (dev->usage[idx] & ISDN_USAGE_EXCLUSIVE) {
2158                                 if ((lp->pre_channel != ch) ||
2159                                     (lp->pre_device != di)) {
2160                                         /* Here we got a problem:
2161                                          * If using an ICN-Card, an incoming call is always signaled on
2162                                          * on the first channel of the card, if both channels are
2163                                          * down. However this channel may be bound exclusive. If the
2164                                          * second channel is free, this call should be accepted.
2165                                          * The solution is horribly but it runs, so what:
2166                                          * We exchange the exclusive bindings of the two channels, the
2167                                          * corresponding variables in the interface-structs.
2168                                          */
2169                                         if (ch == 0) {
2170                                                 sidx = isdn_dc2minor(di, 1);
2171 #ifdef ISDN_DEBUG_NET_ICALL
2172                                                 printk(KERN_DEBUG "n_fi: ch is 0\n");
2173 #endif
2174                                                 if (USG_NONE(dev->usage[sidx])) {
2175                                                         /* Second Channel is free, now see if it is bound
2176                                                          * exclusive too. */
2177                                                         if (dev->usage[sidx] & ISDN_USAGE_EXCLUSIVE) {
2178 #ifdef ISDN_DEBUG_NET_ICALL
2179                                                                 printk(KERN_DEBUG "n_fi: 2nd channel is down and bound\n");
2180 #endif
2181                                                                 /* Yes, swap bindings only, if the original
2182                                                                  * binding is bound to channel 1 of this driver */
2183                                                                 if ((lp->pre_device == di) &&
2184                                                                     (lp->pre_channel == 1)) {
2185                                                                         isdn_net_swapbind(di);
2186                                                                         swapped = 1;
2187                                                                 } else {
2188                                                                         /* ... else iterate next device */
2189                                                                         p = (isdn_net_dev *) p->next;
2190                                                                         continue;
2191                                                                 }
2192                                                         } else {
2193 #ifdef ISDN_DEBUG_NET_ICALL
2194                                                                 printk(KERN_DEBUG "n_fi: 2nd channel is down and unbound\n");
2195 #endif
2196                                                                 /* No, swap always and swap excl-usage also */
2197                                                                 isdn_net_swap_usage(idx, sidx);
2198                                                                 isdn_net_swapbind(di);
2199                                                                 swapped = 2;
2200                                                         }
2201                                                         /* Now check for exclusive binding again */
2202 #ifdef ISDN_DEBUG_NET_ICALL
2203                                                         printk(KERN_DEBUG "n_fi: final check\n");
2204 #endif
2205                                                         if ((dev->usage[idx] & ISDN_USAGE_EXCLUSIVE) &&
2206                                                             ((lp->pre_channel != ch) ||
2207                                                              (lp->pre_device != di))) {
2208 #ifdef ISDN_DEBUG_NET_ICALL
2209                                                                 printk(KERN_DEBUG "n_fi: final check failed\n");
2210 #endif
2211                                                                 p = (isdn_net_dev *) p->next;
2212                                                                 continue;
2213                                                         }
2214                                                 }
2215                                         } else {
2216                                                 /* We are already on the second channel, so nothing to do */
2217 #ifdef ISDN_DEBUG_NET_ICALL
2218                                                 printk(KERN_DEBUG "n_fi: already on 2nd channel\n");
2219 #endif
2220                                         }
2221                                 }
2222                         }
2223 #ifdef ISDN_DEBUG_NET_ICALL
2224                         printk(KERN_DEBUG "n_fi: match2\n");
2225 #endif
2226                         n = lp->phone[0];
2227                         if (lp->flags & ISDN_NET_SECURE) {
2228                                 while (n) {
2229                                         if (!isdn_msncmp(nr, n->num))
2230                                                 break;
2231                                         n = (isdn_net_phone *) n->next;
2232                                 }
2233                         }
2234                         if (n || (!(lp->flags & ISDN_NET_SECURE))) {
2235 #ifdef ISDN_DEBUG_NET_ICALL
2236                                 printk(KERN_DEBUG "n_fi: match3\n");
2237 #endif
2238                                 /* matching interface found */
2239
2240                                 /*
2241                                  * Is the state STOPPED?
2242                                  * If so, no dialin is allowed,
2243                                  * so reject actively.
2244                                  * */
2245                                 if (ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_OFF) {
2246                                         printk(KERN_INFO "incoming call, interface %s `stopped' -> rejected\n",
2247                                                p->dev->name);
2248                                         return 3;
2249                                 }
2250                                 /*
2251                                  * Is the interface up?
2252                                  * If not, reject the call actively.
2253                                  */
2254                                 if (!isdn_net_device_started(p)) {
2255                                         printk(KERN_INFO "%s: incoming call, interface down -> rejected\n",
2256                                                p->dev->name);
2257                                         return 3;
2258                                 }
2259                                 /* Interface is up, now see if it's a slave. If so, see if
2260                                  * it's master and parent slave is online. If not, reject the call.
2261                                  */
2262                                 if (lp->master) {
2263                                         isdn_net_local *mlp = ISDN_MASTER_PRIV(lp);
2264                                         printk(KERN_DEBUG "ICALLslv: %s\n", p->dev->name);
2265                                         printk(KERN_DEBUG "master=%s\n", lp->master->name);
2266                                         if (mlp->flags & ISDN_NET_CONNECTED) {
2267                                                 printk(KERN_DEBUG "master online\n");
2268                                                 /* Master is online, find parent-slave (master if first slave) */
2269                                                 while (mlp->slave) {
2270                                                         if (ISDN_SLAVE_PRIV(mlp) == lp)
2271                                                                 break;
2272                                                         mlp = ISDN_SLAVE_PRIV(mlp);
2273                                                 }
2274                                         } else
2275                                                 printk(KERN_DEBUG "master offline\n");
2276                                         /* Found parent, if it's offline iterate next device */
2277                                         printk(KERN_DEBUG "mlpf: %d\n", mlp->flags & ISDN_NET_CONNECTED);
2278                                         if (!(mlp->flags & ISDN_NET_CONNECTED)) {
2279                                                 p = (isdn_net_dev *) p->next;
2280                                                 continue;
2281                                         }
2282                                 }
2283                                 if (lp->flags & ISDN_NET_CALLBACK) {
2284                                         int chi;
2285                                         /*
2286                                          * Is the state MANUAL?
2287                                          * If so, no callback can be made,
2288                                          * so reject actively.
2289                                          * */
2290                                         if (ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_OFF) {
2291                                                 printk(KERN_INFO "incoming call for callback, interface %s `off' -> rejected\n",
2292                                                        p->dev->name);
2293                                                 return 3;
2294                                         }
2295                                         printk(KERN_DEBUG "%s: call from %s -> %s, start callback\n",
2296                                                p->dev->name, nr, eaz);
2297                                         if (lp->phone[1]) {
2298                                                 /* Grab a free ISDN-Channel */
2299                                                 spin_lock_irqsave(&dev->lock, flags);
2300                                                 if ((chi =
2301                                                      isdn_get_free_channel(
2302                                                              ISDN_USAGE_NET,
2303                                                              lp->l2_proto,
2304                                                              lp->l3_proto,
2305                                                              lp->pre_device,
2306                                                              lp->pre_channel,
2307                                                              lp->msn)
2308                                                             ) < 0) {
2309
2310                                                         printk(KERN_WARNING "isdn_net_find_icall: No channel for %s\n",
2311                                                                p->dev->name);
2312                                                         spin_unlock_irqrestore(&dev->lock, flags);
2313                                                         return 0;
2314                                                 }
2315                                                 /* Setup dialstate. */
2316                                                 lp->dtimer = 0;
2317                                                 lp->dialstate = 11;
2318                                                 /* Connect interface with channel */
2319                                                 isdn_net_bind_channel(lp, chi);
2320 #ifdef CONFIG_ISDN_PPP
2321                                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
2322                                                         if (isdn_ppp_bind(lp) < 0) {
2323                                                                 spin_unlock_irqrestore(&dev->lock, flags);
2324                                                                 isdn_net_unbind_channel(lp);
2325                                                                 return 0;
2326                                                         }
2327 #endif
2328                                                 spin_unlock_irqrestore(&dev->lock, flags);
2329                                                 /* Initiate dialing by returning 2 or 4 */
2330                                                 return (lp->flags & ISDN_NET_CBHUP) ? 2 : 4;
2331                                         } else
2332                                                 printk(KERN_WARNING "isdn_net: %s: No phone number\n",
2333                                                        p->dev->name);
2334                                         return 0;
2335                                 } else {
2336                                         printk(KERN_DEBUG "%s: call from %s -> %s accepted\n",
2337                                                p->dev->name, nr, eaz);
2338                                         /* if this interface is dialing, it does it probably on a different
2339                                            device, so free this device */
2340                                         if ((lp->dialstate == 4) || (lp->dialstate == 12)) {
2341 #ifdef CONFIG_ISDN_PPP
2342                                                 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
2343                                                         isdn_ppp_free(lp);
2344 #endif
2345                                                 isdn_net_lp_disconnected(lp);
2346                                                 isdn_free_channel(lp->isdn_device, lp->isdn_channel,
2347                                                                   ISDN_USAGE_NET);
2348                                         }
2349                                         spin_lock_irqsave(&dev->lock, flags);
2350                                         dev->usage[idx] &= ISDN_USAGE_EXCLUSIVE;
2351                                         dev->usage[idx] |= ISDN_USAGE_NET;
2352                                         strcpy(dev->num[idx], nr);
2353                                         isdn_info_update();
2354                                         dev->st_netdev[idx] = lp->netdev;
2355                                         lp->isdn_device = di;
2356                                         lp->isdn_channel = ch;
2357                                         lp->ppp_slot = -1;
2358                                         lp->flags |= ISDN_NET_CONNECTED;
2359                                         lp->dialstate = 7;
2360                                         lp->dtimer = 0;
2361                                         lp->outgoing = 0;
2362                                         lp->huptimer = 0;
2363                                         lp->hupflags |= ISDN_WAITCHARGE;
2364                                         lp->hupflags &= ~ISDN_HAVECHARGE;
2365 #ifdef CONFIG_ISDN_PPP
2366                                         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) {
2367                                                 if (isdn_ppp_bind(lp) < 0) {
2368                                                         isdn_net_unbind_channel(lp);
2369                                                         spin_unlock_irqrestore(&dev->lock, flags);
2370                                                         return 0;
2371                                                 }
2372                                         }
2373 #endif
2374                                         spin_unlock_irqrestore(&dev->lock, flags);
2375                                         return 1;
2376                                 }
2377                         }
2378                 }
2379                 p = (isdn_net_dev *) p->next;
2380         }
2381         /* If none of configured EAZ/MSN matched and not verbose, be silent */
2382         if (!ematch || dev->net_verbose)
2383                 printk(KERN_INFO "isdn_net: call from %s -> %d %s ignored\n", nr, di, eaz);
2384         return (wret == 2) ? 5 : 0;
2385 }
2386
2387 /*
2388  * Search list of net-interfaces for an interface with given name.
2389  */
2390 isdn_net_dev *
2391 isdn_net_findif(char *name)
2392 {
2393         isdn_net_dev *p = dev->netdev;
2394
2395         while (p) {
2396                 if (!strcmp(p->dev->name, name))
2397                         return p;
2398                 p = (isdn_net_dev *) p->next;
2399         }
2400         return (isdn_net_dev *) NULL;
2401 }
2402
2403 /*
2404  * Force a net-interface to dial out.
2405  * This is called from the userlevel-routine below or
2406  * from isdn_net_start_xmit().
2407  */
2408 static int
2409 isdn_net_force_dial_lp(isdn_net_local *lp)
2410 {
2411         if ((!(lp->flags & ISDN_NET_CONNECTED)) && !lp->dialstate) {
2412                 int chi;
2413                 if (lp->phone[1]) {
2414                         ulong flags;
2415
2416                         /* Grab a free ISDN-Channel */
2417                         spin_lock_irqsave(&dev->lock, flags);
2418                         if ((chi = isdn_get_free_channel(
2419                                      ISDN_USAGE_NET,
2420                                      lp->l2_proto,
2421                                      lp->l3_proto,
2422                                      lp->pre_device,
2423                                      lp->pre_channel,
2424                                      lp->msn)) < 0) {
2425                                 printk(KERN_WARNING "isdn_net_force_dial: No channel for %s\n",
2426                                        lp->netdev->dev->name);
2427                                 spin_unlock_irqrestore(&dev->lock, flags);
2428                                 return -EAGAIN;
2429                         }
2430                         lp->dialstate = 1;
2431                         /* Connect interface with channel */
2432                         isdn_net_bind_channel(lp, chi);
2433 #ifdef CONFIG_ISDN_PPP
2434                         if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP)
2435                                 if (isdn_ppp_bind(lp) < 0) {
2436                                         isdn_net_unbind_channel(lp);
2437                                         spin_unlock_irqrestore(&dev->lock, flags);
2438                                         return -EAGAIN;
2439                                 }
2440 #endif
2441                         /* Initiate dialing */
2442                         spin_unlock_irqrestore(&dev->lock, flags);
2443                         isdn_net_dial();
2444                         return 0;
2445                 } else
2446                         return -EINVAL;
2447         } else
2448                 return -EBUSY;
2449 }
2450
2451 /*
2452  * This is called from certain upper protocol layers (multilink ppp
2453  * and x25iface encapsulation module) that want to initiate dialing
2454  * themselves.
2455  */
2456 int
2457 isdn_net_dial_req(isdn_net_local *lp)
2458 {
2459         /* is there a better error code? */
2460         if (!(ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_AUTO)) return -EBUSY;
2461
2462         return isdn_net_force_dial_lp(lp);
2463 }
2464
2465 /*
2466  * Force a net-interface to dial out.
2467  * This is always called from within userspace (ISDN_IOCTL_NET_DIAL).
2468  */
2469 int
2470 isdn_net_force_dial(char *name)
2471 {
2472         isdn_net_dev *p = isdn_net_findif(name);
2473
2474         if (!p)
2475                 return -ENODEV;
2476         return (isdn_net_force_dial_lp(p->local));
2477 }
2478
2479 /* The ISDN-specific entries in the device structure. */
2480 static const struct net_device_ops isdn_netdev_ops = {
2481         .ndo_init             = isdn_net_init,
2482         .ndo_open             = isdn_net_open,
2483         .ndo_stop             = isdn_net_close,
2484         .ndo_do_ioctl         = isdn_net_ioctl,
2485
2486         .ndo_start_xmit       = isdn_net_start_xmit,
2487         .ndo_get_stats        = isdn_net_get_stats,
2488         .ndo_tx_timeout       = isdn_net_tx_timeout,
2489 };
2490
2491 /*
2492  * Helper for alloc_netdev()
2493  */
2494 static void _isdn_setup(struct net_device *dev)
2495 {
2496         isdn_net_local *lp = netdev_priv(dev);
2497
2498         ether_setup(dev);
2499
2500         /* Setup the generic properties */
2501         dev->flags = IFF_NOARP | IFF_POINTOPOINT;
2502
2503         /* isdn prepends a header in the tx path, can't share skbs */
2504         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2505         dev->header_ops = NULL;
2506         dev->netdev_ops = &isdn_netdev_ops;
2507
2508         /* for clients with MPPP maybe higher values better */
2509         dev->tx_queue_len = 30;
2510
2511         lp->p_encap = ISDN_NET_ENCAP_RAWIP;
2512         lp->magic = ISDN_NET_MAGIC;
2513         lp->last = lp;
2514         lp->next = lp;
2515         lp->isdn_device = -1;
2516         lp->isdn_channel = -1;
2517         lp->pre_device = -1;
2518         lp->pre_channel = -1;
2519         lp->exclusive = -1;
2520         lp->ppp_slot = -1;
2521         lp->pppbind = -1;
2522         skb_queue_head_init(&lp->super_tx_queue);
2523         lp->l2_proto = ISDN_PROTO_L2_X75I;
2524         lp->l3_proto = ISDN_PROTO_L3_TRANS;
2525         lp->triggercps = 6000;
2526         lp->slavedelay = 10 * HZ;
2527         lp->hupflags = ISDN_INHUP;      /* Do hangup even on incoming calls */
2528         lp->onhtime = 10;       /* Default hangup-time for saving costs */
2529         lp->dialmax = 1;
2530         /* Hangup before Callback, manual dial */
2531         lp->flags = ISDN_NET_CBHUP | ISDN_NET_DM_MANUAL;
2532         lp->cbdelay = 25;       /* Wait 5 secs before Callback */
2533         lp->dialtimeout = -1;  /* Infinite Dial-Timeout */
2534         lp->dialwait = 5 * HZ; /* Wait 5 sec. after failed dial */
2535         lp->dialstarted = 0;   /* Jiffies of last dial-start */
2536         lp->dialwait_timer = 0;  /* Jiffies of earliest next dial-start */
2537 }
2538
2539 /*
2540  * Allocate a new network-interface and initialize its data structures.
2541  */
2542 char *
2543 isdn_net_new(char *name, struct net_device *master)
2544 {
2545         isdn_net_dev *netdev;
2546
2547         /* Avoid creating an existing interface */
2548         if (isdn_net_findif(name)) {
2549                 printk(KERN_WARNING "isdn_net: interface %s already exists\n", name);
2550                 return NULL;
2551         }
2552         if (name == NULL)
2553                 return NULL;
2554         if (!(netdev = kzalloc(sizeof(isdn_net_dev), GFP_KERNEL))) {
2555                 printk(KERN_WARNING "isdn_net: Could not allocate net-device\n");
2556                 return NULL;
2557         }
2558         netdev->dev = alloc_netdev(sizeof(isdn_net_local), name,
2559                                    NET_NAME_UNKNOWN, _isdn_setup);
2560         if (!netdev->dev) {
2561                 printk(KERN_WARNING "isdn_net: Could not allocate network device\n");
2562                 kfree(netdev);
2563                 return NULL;
2564         }
2565         netdev->local = netdev_priv(netdev->dev);
2566
2567         if (master) {
2568                 /* Device shall be a slave */
2569                 struct net_device *p = MASTER_TO_SLAVE(master);
2570                 struct net_device *q = master;
2571
2572                 netdev->local->master = master;
2573                 /* Put device at end of slave-chain */
2574                 while (p) {
2575                         q = p;
2576                         p = MASTER_TO_SLAVE(p);
2577                 }
2578                 MASTER_TO_SLAVE(q) = netdev->dev;
2579         } else {
2580                 /* Device shall be a master */
2581                 /*
2582                  * Watchdog timer (currently) for master only.
2583                  */
2584                 netdev->dev->watchdog_timeo = ISDN_NET_TX_TIMEOUT;
2585                 if (register_netdev(netdev->dev) != 0) {
2586                         printk(KERN_WARNING "isdn_net: Could not register net-device\n");
2587                         free_netdev(netdev->dev);
2588                         kfree(netdev);
2589                         return NULL;
2590                 }
2591         }
2592         netdev->queue = netdev->local;
2593         spin_lock_init(&netdev->queue_lock);
2594
2595         netdev->local->netdev = netdev;
2596
2597         INIT_WORK(&netdev->local->tqueue, isdn_net_softint);
2598         spin_lock_init(&netdev->local->xmit_lock);
2599
2600         /* Put into to netdev-chain */
2601         netdev->next = (void *) dev->netdev;
2602         dev->netdev = netdev;
2603         return netdev->dev->name;
2604 }
2605
2606 char *
2607 isdn_net_newslave(char *parm)
2608 {
2609         char *p = strchr(parm, ',');
2610         isdn_net_dev *n;
2611         char newname[10];
2612
2613         if (p) {
2614                 /* Slave-Name MUST not be empty or overflow 'newname' */
2615                 if (strscpy(newname, p + 1, sizeof(newname)) <= 0)
2616                         return NULL;
2617                 *p = 0;
2618                 /* Master must already exist */
2619                 if (!(n = isdn_net_findif(parm)))
2620                         return NULL;
2621                 /* Master must be a real interface, not a slave */
2622                 if (n->local->master)
2623                         return NULL;
2624                 /* Master must not be started yet */
2625                 if (isdn_net_device_started(n))
2626                         return NULL;
2627                 return (isdn_net_new(newname, n->dev));
2628         }
2629         return NULL;
2630 }
2631
2632 /*
2633  * Set interface-parameters.
2634  * Always set all parameters, so the user-level application is responsible
2635  * for not overwriting existing setups. It has to get the current
2636  * setup first, if only selected parameters are to be changed.
2637  */
2638 int
2639 isdn_net_setcfg(isdn_net_ioctl_cfg *cfg)
2640 {
2641         isdn_net_dev *p = isdn_net_findif(cfg->name);
2642         ulong features;
2643         int i;
2644         int drvidx;
2645         int chidx;
2646         char drvid[25];
2647
2648         if (p) {
2649                 isdn_net_local *lp = p->local;
2650
2651                 /* See if any registered driver supports the features we want */
2652                 features = ((1 << cfg->l2_proto) << ISDN_FEATURE_L2_SHIFT) |
2653                         ((1 << cfg->l3_proto) << ISDN_FEATURE_L3_SHIFT);
2654                 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2655                         if (dev->drv[i])
2656                                 if ((dev->drv[i]->interface->features & features) == features)
2657                                         break;
2658                 if (i == ISDN_MAX_DRIVERS) {
2659                         printk(KERN_WARNING "isdn_net: No driver with selected features\n");
2660                         return -ENODEV;
2661                 }
2662                 if (lp->p_encap != cfg->p_encap) {
2663 #ifdef CONFIG_ISDN_X25
2664                         struct concap_proto *cprot = p->cprot;
2665 #endif
2666                         if (isdn_net_device_started(p)) {
2667                                 printk(KERN_WARNING "%s: cannot change encap when if is up\n",
2668                                        p->dev->name);
2669                                 return -EBUSY;
2670                         }
2671 #ifdef CONFIG_ISDN_X25
2672                         if (cprot && cprot->pops)
2673                                 cprot->pops->proto_del(cprot);
2674                         p->cprot = NULL;
2675                         lp->dops = NULL;
2676                         /* ... ,  prepare for configuration of new one ... */
2677                         switch (cfg->p_encap) {
2678                         case ISDN_NET_ENCAP_X25IFACE:
2679                                 lp->dops = &isdn_concap_reliable_dl_dops;
2680                         }
2681                         /* ... and allocate new one ... */
2682                         p->cprot = isdn_concap_new(cfg->p_encap);
2683                         /* p -> cprot == NULL now if p_encap is not supported
2684                            by means of the concap_proto mechanism */
2685                         /* the protocol is not configured yet; this will
2686                            happen later when isdn_net_reset() is called */
2687 #endif
2688                 }
2689                 switch (cfg->p_encap) {
2690                 case ISDN_NET_ENCAP_SYNCPPP:
2691 #ifndef CONFIG_ISDN_PPP
2692                         printk(KERN_WARNING "%s: SyncPPP support not configured\n",
2693                                p->dev->name);
2694                         return -EINVAL;
2695 #else
2696                         p->dev->type = ARPHRD_PPP;      /* change ARP type */
2697                         p->dev->addr_len = 0;
2698 #endif
2699                         break;
2700                 case ISDN_NET_ENCAP_X25IFACE:
2701 #ifndef CONFIG_ISDN_X25
2702                         printk(KERN_WARNING "%s: isdn-x25 support not configured\n",
2703                                p->dev->name);
2704                         return -EINVAL;
2705 #else
2706                         p->dev->type = ARPHRD_X25;      /* change ARP type */
2707                         p->dev->addr_len = 0;
2708 #endif
2709                         break;
2710                 case ISDN_NET_ENCAP_CISCOHDLCK:
2711                         break;
2712                 default:
2713                         if (cfg->p_encap >= 0 &&
2714                             cfg->p_encap <= ISDN_NET_ENCAP_MAX_ENCAP)
2715                                 break;
2716                         printk(KERN_WARNING
2717                                "%s: encapsulation protocol %d not supported\n",
2718                                p->dev->name, cfg->p_encap);
2719                         return -EINVAL;
2720                 }
2721                 if (strlen(cfg->drvid)) {
2722                         /* A bind has been requested ... */
2723                         char *c,
2724                                 *e;
2725
2726                         if (strnlen(cfg->drvid, sizeof(cfg->drvid)) ==
2727                             sizeof(cfg->drvid))
2728                                 return -EINVAL;
2729                         drvidx = -1;
2730                         chidx = -1;
2731                         strcpy(drvid, cfg->drvid);
2732                         if ((c = strchr(drvid, ','))) {
2733                                 /* The channel-number is appended to the driver-Id with a comma */
2734                                 chidx = (int) simple_strtoul(c + 1, &e, 10);
2735                                 if (e == c)
2736                                         chidx = -1;
2737                                 *c = '\0';
2738                         }
2739                         for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2740                                 /* Lookup driver-Id in array */
2741                                 if (!(strcmp(dev->drvid[i], drvid))) {
2742                                         drvidx = i;
2743                                         break;
2744                                 }
2745                         if ((drvidx == -1) || (chidx == -1))
2746                                 /* Either driver-Id or channel-number invalid */
2747                                 return -ENODEV;
2748                 } else {
2749                         /* Parameters are valid, so get them */
2750                         drvidx = lp->pre_device;
2751                         chidx = lp->pre_channel;
2752                 }
2753                 if (cfg->exclusive > 0) {
2754                         unsigned long flags;
2755
2756                         /* If binding is exclusive, try to grab the channel */
2757                         spin_lock_irqsave(&dev->lock, flags);
2758                         if ((i = isdn_get_free_channel(ISDN_USAGE_NET,
2759                                                        lp->l2_proto, lp->l3_proto, drvidx,
2760                                                        chidx, lp->msn)) < 0) {
2761                                 /* Grab failed, because desired channel is in use */
2762                                 lp->exclusive = -1;
2763                                 spin_unlock_irqrestore(&dev->lock, flags);
2764                                 return -EBUSY;
2765                         }
2766                         /* All went ok, so update isdninfo */
2767                         dev->usage[i] = ISDN_USAGE_EXCLUSIVE;
2768                         isdn_info_update();
2769                         spin_unlock_irqrestore(&dev->lock, flags);
2770                         lp->exclusive = i;
2771                 } else {
2772                         /* Non-exclusive binding or unbind. */
2773                         lp->exclusive = -1;
2774                         if ((lp->pre_device != -1) && (cfg->exclusive == -1)) {
2775                                 isdn_unexclusive_channel(lp->pre_device, lp->pre_channel);
2776                                 isdn_free_channel(lp->pre_device, lp->pre_channel, ISDN_USAGE_NET);
2777                                 drvidx = -1;
2778                                 chidx = -1;
2779                         }
2780                 }
2781                 strlcpy(lp->msn, cfg->eaz, sizeof(lp->msn));
2782                 lp->pre_device = drvidx;
2783                 lp->pre_channel = chidx;
2784                 lp->onhtime = cfg->onhtime;
2785                 lp->charge = cfg->charge;
2786                 lp->l2_proto = cfg->l2_proto;
2787                 lp->l3_proto = cfg->l3_proto;
2788                 lp->cbdelay = cfg->cbdelay;
2789                 lp->dialmax = cfg->dialmax;
2790                 lp->triggercps = cfg->triggercps;
2791                 lp->slavedelay = cfg->slavedelay * HZ;
2792                 lp->pppbind = cfg->pppbind;
2793                 lp->dialtimeout = cfg->dialtimeout >= 0 ? cfg->dialtimeout * HZ : -1;
2794                 lp->dialwait = cfg->dialwait * HZ;
2795                 if (cfg->secure)
2796                         lp->flags |= ISDN_NET_SECURE;
2797                 else
2798                         lp->flags &= ~ISDN_NET_SECURE;
2799                 if (cfg->cbhup)
2800                         lp->flags |= ISDN_NET_CBHUP;
2801                 else
2802                         lp->flags &= ~ISDN_NET_CBHUP;
2803                 switch (cfg->callback) {
2804                 case 0:
2805                         lp->flags &= ~(ISDN_NET_CALLBACK | ISDN_NET_CBOUT);
2806                         break;
2807                 case 1:
2808                         lp->flags |= ISDN_NET_CALLBACK;
2809                         lp->flags &= ~ISDN_NET_CBOUT;
2810                         break;
2811                 case 2:
2812                         lp->flags |= ISDN_NET_CBOUT;
2813                         lp->flags &= ~ISDN_NET_CALLBACK;
2814                         break;
2815                 }
2816                 lp->flags &= ~ISDN_NET_DIALMODE_MASK;   /* first all bits off */
2817                 if (cfg->dialmode && !(cfg->dialmode & ISDN_NET_DIALMODE_MASK)) {
2818                         /* old isdnctrl version, where only 0 or 1 is given */
2819                         printk(KERN_WARNING
2820                                "Old isdnctrl version detected! Please update.\n");
2821                         lp->flags |= ISDN_NET_DM_OFF; /* turn on `off' bit */
2822                 }
2823                 else {
2824                         lp->flags |= cfg->dialmode;  /* turn on selected bits */
2825                 }
2826                 if (cfg->chargehup)
2827                         lp->hupflags |= ISDN_CHARGEHUP;
2828                 else
2829</