1 /* $Id: isdn_common.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
2  *
3  * Linux ISDN subsystem, common used functions (linklevel).
4  *
5  * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
6  * Copyright 1995,96    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  */
13 
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/poll.h>
17 #include <linux/slab.h>
18 #include <linux/vmalloc.h>
19 #include <linux/isdn.h>
20 #include <linux/mutex.h>
21 #include "isdn_common.h"
22 #include "isdn_tty.h"
23 #include "isdn_net.h"
24 #include "isdn_ppp.h"
25 #ifdef CONFIG_ISDN_AUDIO
26 #include "isdn_audio.h"
27 #endif
28 #ifdef CONFIG_ISDN_DIVERSION_MODULE
29 #define CONFIG_ISDN_DIVERSION
30 #endif
31 #ifdef CONFIG_ISDN_DIVERSION
32 #include <linux/isdn_divertif.h>
33 #endif /* CONFIG_ISDN_DIVERSION */
34 #include "isdn_v110.h"
35 
36 /* Debugflags */
37 #undef ISDN_DEBUG_STATCALLB
38 
39 MODULE_DESCRIPTION("ISDN4Linux: link layer");
40 MODULE_AUTHOR("Fritz Elfert");
41 MODULE_LICENSE("GPL");
42 
43 isdn_dev *dev;
44 
45 static DEFINE_MUTEX(isdn_mutex);
46 static char *isdn_revision = "$Revision: 1.1.2.3 $";
47 
48 extern char *isdn_net_revision;
49 extern char *isdn_tty_revision;
50 #ifdef CONFIG_ISDN_PPP
51 extern char *isdn_ppp_revision;
52 #else
53 static char *isdn_ppp_revision = ": none $";
54 #endif
55 #ifdef CONFIG_ISDN_AUDIO
56 extern char *isdn_audio_revision;
57 #else
58 static char *isdn_audio_revision = ": none $";
59 #endif
60 extern char *isdn_v110_revision;
61 
62 #ifdef CONFIG_ISDN_DIVERSION
63 static isdn_divert_if *divert_if; /* = NULL */
64 #endif /* CONFIG_ISDN_DIVERSION */
65 
66 
67 static int isdn_writebuf_stub(int, int, const u_char __user *, int);
68 static void set_global_features(void);
69 static int isdn_wildmat(char *s, char *p);
70 static int isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding);
71 
72 static inline void
isdn_lock_driver(isdn_driver_t * drv)73 isdn_lock_driver(isdn_driver_t *drv)
74 {
75 	try_module_get(drv->interface->owner);
76 	drv->locks++;
77 }
78 
79 void
isdn_lock_drivers(void)80 isdn_lock_drivers(void)
81 {
82 	int i;
83 
84 	for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
85 		if (!dev->drv[i])
86 			continue;
87 		isdn_lock_driver(dev->drv[i]);
88 	}
89 }
90 
91 static inline void
isdn_unlock_driver(isdn_driver_t * drv)92 isdn_unlock_driver(isdn_driver_t *drv)
93 {
94 	if (drv->locks > 0) {
95 		drv->locks--;
96 		module_put(drv->interface->owner);
97 	}
98 }
99 
100 void
isdn_unlock_drivers(void)101 isdn_unlock_drivers(void)
102 {
103 	int i;
104 
105 	for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
106 		if (!dev->drv[i])
107 			continue;
108 		isdn_unlock_driver(dev->drv[i]);
109 	}
110 }
111 
112 #if defined(ISDN_DEBUG_NET_DUMP) || defined(ISDN_DEBUG_MODEM_DUMP)
113 void
isdn_dumppkt(char * s,u_char * p,int len,int dumplen)114 isdn_dumppkt(char *s, u_char *p, int len, int dumplen)
115 {
116 	int dumpc;
117 
118 	printk(KERN_DEBUG "%s(%d) ", s, len);
119 	for (dumpc = 0; (dumpc < dumplen) && (len); len--, dumpc++)
120 		printk(" %02x", *p++);
121 	printk("\n");
122 }
123 #endif
124 
125 /*
126  * I picked the pattern-matching-functions from an old GNU-tar version (1.10)
127  * It was originally written and put to PD by rs@mirror.TMC.COM (Rich Salz)
128  */
129 static int
isdn_star(char * s,char * p)130 isdn_star(char *s, char *p)
131 {
132 	while (isdn_wildmat(s, p)) {
133 		if (*++s == '\0')
134 			return (2);
135 	}
136 	return (0);
137 }
138 
139 /*
140  * Shell-type Pattern-matching for incoming caller-Ids
141  * This function gets a string in s and checks, if it matches the pattern
142  * given in p.
143  *
144  * Return:
145  *   0 = match.
146  *   1 = no match.
147  *   2 = no match. Would eventually match, if s would be longer.
148  *
149  * Possible Patterns:
150  *
151  * '?'     matches one character
152  * '*'     matches zero or more characters
153  * [xyz]   matches the set of characters in brackets.
154  * [^xyz]  matches any single character not in the set of characters
155  */
156 
157 static int
isdn_wildmat(char * s,char * p)158 isdn_wildmat(char *s, char *p)
159 {
160 	register int last;
161 	register int matched;
162 	register int reverse;
163 	register int nostar = 1;
164 
165 	if (!(*s) && !(*p))
166 		return (1);
167 	for (; *p; s++, p++)
168 		switch (*p) {
169 		case '\\':
170 			/*
171 			 * Literal match with following character,
172 			 * fall through.
173 			 */
174 			p++;
175 		default:
176 			if (*s != *p)
177 				return (*s == '\0') ? 2 : 1;
178 					continue;
179 		case '?':
180 			/* Match anything. */
181 			if (*s == '\0')
182 				return (2);
183 			continue;
184 		case '*':
185 			nostar = 0;
186 			/* Trailing star matches everything. */
187 			return (*++p ? isdn_star(s, p) : 0);
188 		case '[':
189 			/* [^....] means inverse character class. */
190 			if ((reverse = (p[1] == '^')))
191 				p++;
192 			for (last = 0, matched = 0; *++p && (*p != ']'); last = *p)
193 				/* This next line requires a good C compiler. */
194 				if (*p == '-' ? *s <= *++p && *s >= last : *s == *p)
195 					matched = 1;
196 			if (matched == reverse)
197 				return (1);
198 			continue;
199 		}
200 	return (*s == '\0') ? 0 : nostar;
201 }
202 
isdn_msncmp(const char * msn1,const char * msn2)203 int isdn_msncmp(const char *msn1, const char *msn2)
204 {
205 	char TmpMsn1[ISDN_MSNLEN];
206 	char TmpMsn2[ISDN_MSNLEN];
207 	char *p;
208 
209 	for (p = TmpMsn1; *msn1 && *msn1 != ':';)  // Strip off a SPID
210 		*p++ = *msn1++;
211 	*p = '\0';
212 
213 	for (p = TmpMsn2; *msn2 && *msn2 != ':';)  // Strip off a SPID
214 		*p++ = *msn2++;
215 	*p = '\0';
216 
217 	return isdn_wildmat(TmpMsn1, TmpMsn2);
218 }
219 
220 int
isdn_dc2minor(int di,int ch)221 isdn_dc2minor(int di, int ch)
222 {
223 	int i;
224 	for (i = 0; i < ISDN_MAX_CHANNELS; i++)
225 		if (dev->chanmap[i] == ch && dev->drvmap[i] == di)
226 			return i;
227 	return -1;
228 }
229 
230 static int isdn_timer_cnt1 = 0;
231 static int isdn_timer_cnt2 = 0;
232 static int isdn_timer_cnt3 = 0;
233 
234 static void
isdn_timer_funct(ulong dummy)235 isdn_timer_funct(ulong dummy)
236 {
237 	int tf = dev->tflags;
238 	if (tf & ISDN_TIMER_FAST) {
239 		if (tf & ISDN_TIMER_MODEMREAD)
240 			isdn_tty_readmodem();
241 		if (tf & ISDN_TIMER_MODEMPLUS)
242 			isdn_tty_modem_escape();
243 		if (tf & ISDN_TIMER_MODEMXMIT)
244 			isdn_tty_modem_xmit();
245 	}
246 	if (tf & ISDN_TIMER_SLOW) {
247 		if (++isdn_timer_cnt1 >= ISDN_TIMER_02SEC) {
248 			isdn_timer_cnt1 = 0;
249 			if (tf & ISDN_TIMER_NETDIAL)
250 				isdn_net_dial();
251 		}
252 		if (++isdn_timer_cnt2 >= ISDN_TIMER_1SEC) {
253 			isdn_timer_cnt2 = 0;
254 			if (tf & ISDN_TIMER_NETHANGUP)
255 				isdn_net_autohup();
256 			if (++isdn_timer_cnt3 >= ISDN_TIMER_RINGING) {
257 				isdn_timer_cnt3 = 0;
258 				if (tf & ISDN_TIMER_MODEMRING)
259 					isdn_tty_modem_ring();
260 			}
261 			if (tf & ISDN_TIMER_CARRIER)
262 				isdn_tty_carrier_timeout();
263 		}
264 	}
265 	if (tf)
266 		mod_timer(&dev->timer, jiffies + ISDN_TIMER_RES);
267 }
268 
269 void
isdn_timer_ctrl(int tf,int onoff)270 isdn_timer_ctrl(int tf, int onoff)
271 {
272 	unsigned long flags;
273 	int old_tflags;
274 
275 	spin_lock_irqsave(&dev->timerlock, flags);
276 	if ((tf & ISDN_TIMER_SLOW) && (!(dev->tflags & ISDN_TIMER_SLOW))) {
277 		/* If the slow-timer wasn't activated until now */
278 		isdn_timer_cnt1 = 0;
279 		isdn_timer_cnt2 = 0;
280 	}
281 	old_tflags = dev->tflags;
282 	if (onoff)
283 		dev->tflags |= tf;
284 	else
285 		dev->tflags &= ~tf;
286 	if (dev->tflags && !old_tflags)
287 		mod_timer(&dev->timer, jiffies + ISDN_TIMER_RES);
288 	spin_unlock_irqrestore(&dev->timerlock, flags);
289 }
290 
291 /*
292  * Receive a packet from B-Channel. (Called from low-level-module)
293  */
294 static void
isdn_receive_skb_callback(int di,int channel,struct sk_buff * skb)295 isdn_receive_skb_callback(int di, int channel, struct sk_buff *skb)
296 {
297 	int i;
298 
299 	if ((i = isdn_dc2minor(di, channel)) == -1) {
300 		dev_kfree_skb(skb);
301 		return;
302 	}
303 	/* Update statistics */
304 	dev->ibytes[i] += skb->len;
305 
306 	/* First, try to deliver data to network-device */
307 	if (isdn_net_rcv_skb(i, skb))
308 		return;
309 
310 	/* V.110 handling
311 	 * makes sense for async streams only, so it is
312 	 * called after possible net-device delivery.
313 	 */
314 	if (dev->v110[i]) {
315 		atomic_inc(&dev->v110use[i]);
316 		skb = isdn_v110_decode(dev->v110[i], skb);
317 		atomic_dec(&dev->v110use[i]);
318 		if (!skb)
319 			return;
320 	}
321 
322 	/* No network-device found, deliver to tty or raw-channel */
323 	if (skb->len) {
324 		if (isdn_tty_rcv_skb(i, di, channel, skb))
325 			return;
326 		wake_up_interruptible(&dev->drv[di]->rcv_waitq[channel]);
327 	} else
328 		dev_kfree_skb(skb);
329 }
330 
331 /*
332  * Intercept command from Linklevel to Lowlevel.
333  * If layer 2 protocol is V.110 and this is not supported by current
334  * lowlevel-driver, use driver's transparent mode and handle V.110 in
335  * linklevel instead.
336  */
337 int
isdn_command(isdn_ctrl * cmd)338 isdn_command(isdn_ctrl *cmd)
339 {
340 	if (cmd->driver == -1) {
341 		printk(KERN_WARNING "isdn_command command(%x) driver -1\n", cmd->command);
342 		return (1);
343 	}
344 	if (!dev->drv[cmd->driver]) {
345 		printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d] NULL\n",
346 		       cmd->command, cmd->driver);
347 		return (1);
348 	}
349 	if (!dev->drv[cmd->driver]->interface) {
350 		printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d]->interface NULL\n",
351 		       cmd->command, cmd->driver);
352 		return (1);
353 	}
354 	if (cmd->command == ISDN_CMD_SETL2) {
355 		int idx = isdn_dc2minor(cmd->driver, cmd->arg & 255);
356 		unsigned long l2prot = (cmd->arg >> 8) & 255;
357 		unsigned long features = (dev->drv[cmd->driver]->interface->features
358 					  >> ISDN_FEATURE_L2_SHIFT) &
359 			ISDN_FEATURE_L2_MASK;
360 		unsigned long l2_feature = (1 << l2prot);
361 
362 		switch (l2prot) {
363 		case ISDN_PROTO_L2_V11096:
364 		case ISDN_PROTO_L2_V11019:
365 		case ISDN_PROTO_L2_V11038:
366 			/* If V.110 requested, but not supported by
367 			 * HL-driver, set emulator-flag and change
368 			 * Layer-2 to transparent
369 			 */
370 			if (!(features & l2_feature)) {
371 				dev->v110emu[idx] = l2prot;
372 				cmd->arg = (cmd->arg & 255) |
373 					(ISDN_PROTO_L2_TRANS << 8);
374 			} else
375 				dev->v110emu[idx] = 0;
376 		}
377 	}
378 	return dev->drv[cmd->driver]->interface->command(cmd);
379 }
380 
381 void
isdn_all_eaz(int di,int ch)382 isdn_all_eaz(int di, int ch)
383 {
384 	isdn_ctrl cmd;
385 
386 	if (di < 0)
387 		return;
388 	cmd.driver = di;
389 	cmd.arg = ch;
390 	cmd.command = ISDN_CMD_SETEAZ;
391 	cmd.parm.num[0] = '\0';
392 	isdn_command(&cmd);
393 }
394 
395 /*
396  * Begin of a CAPI like LL<->HL interface, currently used only for
397  * supplementary service (CAPI 2.0 part III)
398  */
399 #include <linux/isdn/capicmd.h>
400 
401 static int
isdn_capi_rec_hl_msg(capi_msg * cm)402 isdn_capi_rec_hl_msg(capi_msg *cm)
403 {
404 	switch (cm->Command) {
405 	case CAPI_FACILITY:
406 		/* in the moment only handled in tty */
407 		return (isdn_tty_capi_facility(cm));
408 	default:
409 		return (-1);
410 	}
411 }
412 
413 static int
isdn_status_callback(isdn_ctrl * c)414 isdn_status_callback(isdn_ctrl *c)
415 {
416 	int di;
417 	u_long flags;
418 	int i;
419 	int r;
420 	int retval = 0;
421 	isdn_ctrl cmd;
422 	isdn_net_dev *p;
423 
424 	di = c->driver;
425 	i = isdn_dc2minor(di, c->arg);
426 	switch (c->command) {
427 	case ISDN_STAT_BSENT:
428 		if (i < 0)
429 			return -1;
430 		if (dev->global_flags & ISDN_GLOBAL_STOPPED)
431 			return 0;
432 		if (isdn_net_stat_callback(i, c))
433 			return 0;
434 		if (isdn_v110_stat_callback(i, c))
435 			return 0;
436 		if (isdn_tty_stat_callback(i, c))
437 			return 0;
438 		wake_up_interruptible(&dev->drv[di]->snd_waitq[c->arg]);
439 		break;
440 	case ISDN_STAT_STAVAIL:
441 		dev->drv[di]->stavail += c->arg;
442 		wake_up_interruptible(&dev->drv[di]->st_waitq);
443 		break;
444 	case ISDN_STAT_RUN:
445 		dev->drv[di]->flags |= DRV_FLAG_RUNNING;
446 		for (i = 0; i < ISDN_MAX_CHANNELS; i++)
447 			if (dev->drvmap[i] == di)
448 				isdn_all_eaz(di, dev->chanmap[i]);
449 		set_global_features();
450 		break;
451 	case ISDN_STAT_STOP:
452 		dev->drv[di]->flags &= ~DRV_FLAG_RUNNING;
453 		break;
454 	case ISDN_STAT_ICALL:
455 		if (i < 0)
456 			return -1;
457 #ifdef ISDN_DEBUG_STATCALLB
458 		printk(KERN_DEBUG "ICALL (net): %d %ld %s\n", di, c->arg, c->parm.num);
459 #endif
460 		if (dev->global_flags & ISDN_GLOBAL_STOPPED) {
461 			cmd.driver = di;
462 			cmd.arg = c->arg;
463 			cmd.command = ISDN_CMD_HANGUP;
464 			isdn_command(&cmd);
465 			return 0;
466 		}
467 		/* Try to find a network-interface which will accept incoming call */
468 		r = ((c->command == ISDN_STAT_ICALLW) ? 0 : isdn_net_find_icall(di, c->arg, i, &c->parm.setup));
469 		switch (r) {
470 		case 0:
471 			/* No network-device replies.
472 			 * Try ttyI's.
473 			 * These return 0 on no match, 1 on match and
474 			 * 3 on eventually match, if CID is longer.
475 			 */
476 			if (c->command == ISDN_STAT_ICALL)
477 				if ((retval = isdn_tty_find_icall(di, c->arg, &c->parm.setup))) return (retval);
478 #ifdef CONFIG_ISDN_DIVERSION
479 			if (divert_if)
480 				if ((retval = divert_if->stat_callback(c)))
481 					return (retval); /* processed */
482 #endif /* CONFIG_ISDN_DIVERSION */
483 			if ((!retval) && (dev->drv[di]->flags & DRV_FLAG_REJBUS)) {
484 				/* No tty responding */
485 				cmd.driver = di;
486 				cmd.arg = c->arg;
487 				cmd.command = ISDN_CMD_HANGUP;
488 				isdn_command(&cmd);
489 				retval = 2;
490 			}
491 			break;
492 		case 1:
493 			/* Schedule connection-setup */
494 			isdn_net_dial();
495 			cmd.driver = di;
496 			cmd.arg = c->arg;
497 			cmd.command = ISDN_CMD_ACCEPTD;
498 			for (p = dev->netdev; p; p = p->next)
499 				if (p->local->isdn_channel == cmd.arg)
500 				{
501 					strcpy(cmd.parm.setup.eazmsn, p->local->msn);
502 					isdn_command(&cmd);
503 					retval = 1;
504 					break;
505 				}
506 			break;
507 
508 		case 2:	/* For calling back, first reject incoming call ... */
509 		case 3:	/* Interface found, but down, reject call actively  */
510 			retval = 2;
511 			printk(KERN_INFO "isdn: Rejecting Call\n");
512 			cmd.driver = di;
513 			cmd.arg = c->arg;
514 			cmd.command = ISDN_CMD_HANGUP;
515 			isdn_command(&cmd);
516 			if (r == 3)
517 				break;
518 			/* Fall through */
519 		case 4:
520 			/* ... then start callback. */
521 			isdn_net_dial();
522 			break;
523 		case 5:
524 			/* Number would eventually match, if longer */
525 			retval = 3;
526 			break;
527 		}
528 #ifdef ISDN_DEBUG_STATCALLB
529 		printk(KERN_DEBUG "ICALL: ret=%d\n", retval);
530 #endif
531 		return retval;
532 		break;
533 	case ISDN_STAT_CINF:
534 		if (i < 0)
535 			return -1;
536 #ifdef ISDN_DEBUG_STATCALLB
537 		printk(KERN_DEBUG "CINF: %ld %s\n", c->arg, c->parm.num);
538 #endif
539 		if (dev->global_flags & ISDN_GLOBAL_STOPPED)
540 			return 0;
541 		if (strcmp(c->parm.num, "0"))
542 			isdn_net_stat_callback(i, c);
543 		isdn_tty_stat_callback(i, c);
544 		break;
545 	case ISDN_STAT_CAUSE:
546 #ifdef ISDN_DEBUG_STATCALLB
547 		printk(KERN_DEBUG "CAUSE: %ld %s\n", c->arg, c->parm.num);
548 #endif
549 		printk(KERN_INFO "isdn: %s,ch%ld cause: %s\n",
550 		       dev->drvid[di], c->arg, c->parm.num);
551 		isdn_tty_stat_callback(i, c);
552 #ifdef CONFIG_ISDN_DIVERSION
553 		if (divert_if)
554 			divert_if->stat_callback(c);
555 #endif /* CONFIG_ISDN_DIVERSION */
556 		break;
557 	case ISDN_STAT_DISPLAY:
558 #ifdef ISDN_DEBUG_STATCALLB
559 		printk(KERN_DEBUG "DISPLAY: %ld %s\n", c->arg, c->parm.display);
560 #endif
561 		isdn_tty_stat_callback(i, c);
562 #ifdef CONFIG_ISDN_DIVERSION
563 		if (divert_if)
564 			divert_if->stat_callback(c);
565 #endif /* CONFIG_ISDN_DIVERSION */
566 		break;
567 	case ISDN_STAT_DCONN:
568 		if (i < 0)
569 			return -1;
570 #ifdef ISDN_DEBUG_STATCALLB
571 		printk(KERN_DEBUG "DCONN: %ld\n", c->arg);
572 #endif
573 		if (dev->global_flags & ISDN_GLOBAL_STOPPED)
574 			return 0;
575 		/* Find any net-device, waiting for D-channel setup */
576 		if (isdn_net_stat_callback(i, c))
577 			break;
578 		isdn_v110_stat_callback(i, c);
579 		/* Find any ttyI, waiting for D-channel setup */
580 		if (isdn_tty_stat_callback(i, c)) {
581 			cmd.driver = di;
582 			cmd.arg = c->arg;
583 			cmd.command = ISDN_CMD_ACCEPTB;
584 			isdn_command(&cmd);
585 			break;
586 		}
587 		break;
588 	case ISDN_STAT_DHUP:
589 		if (i < 0)
590 			return -1;
591 #ifdef ISDN_DEBUG_STATCALLB
592 		printk(KERN_DEBUG "DHUP: %ld\n", c->arg);
593 #endif
594 		if (dev->global_flags & ISDN_GLOBAL_STOPPED)
595 			return 0;
596 		dev->drv[di]->online &= ~(1 << (c->arg));
597 		isdn_info_update();
598 		/* Signal hangup to network-devices */
599 		if (isdn_net_stat_callback(i, c))
600 			break;
601 		isdn_v110_stat_callback(i, c);
602 		if (isdn_tty_stat_callback(i, c))
603 			break;
604 #ifdef CONFIG_ISDN_DIVERSION
605 		if (divert_if)
606 			divert_if->stat_callback(c);
607 #endif /* CONFIG_ISDN_DIVERSION */
608 		break;
609 		break;
610 	case ISDN_STAT_BCONN:
611 		if (i < 0)
612 			return -1;
613 #ifdef ISDN_DEBUG_STATCALLB
614 		printk(KERN_DEBUG "BCONN: %ld\n", c->arg);
615 #endif
616 		/* Signal B-channel-connect to network-devices */
617 		if (dev->global_flags & ISDN_GLOBAL_STOPPED)
618 			return 0;
619 		dev->drv[di]->online |= (1 << (c->arg));
620 		isdn_info_update();
621 		if (isdn_net_stat_callback(i, c))
622 			break;
623 		isdn_v110_stat_callback(i, c);
624 		if (isdn_tty_stat_callback(i, c))
625 			break;
626 		break;
627 	case ISDN_STAT_BHUP:
628 		if (i < 0)
629 			return -1;
630 #ifdef ISDN_DEBUG_STATCALLB
631 		printk(KERN_DEBUG "BHUP: %ld\n", c->arg);
632 #endif
633 		if (dev->global_flags & ISDN_GLOBAL_STOPPED)
634 			return 0;
635 		dev->drv[di]->online &= ~(1 << (c->arg));
636 		isdn_info_update();
637 #ifdef CONFIG_ISDN_X25
638 		/* Signal hangup to network-devices */
639 		if (isdn_net_stat_callback(i, c))
640 			break;
641 #endif
642 		isdn_v110_stat_callback(i, c);
643 		if (isdn_tty_stat_callback(i, c))
644 			break;
645 		break;
646 	case ISDN_STAT_NODCH:
647 		if (i < 0)
648 			return -1;
649 #ifdef ISDN_DEBUG_STATCALLB
650 		printk(KERN_DEBUG "NODCH: %ld\n", c->arg);
651 #endif
652 		if (dev->global_flags & ISDN_GLOBAL_STOPPED)
653 			return 0;
654 		if (isdn_net_stat_callback(i, c))
655 			break;
656 		if (isdn_tty_stat_callback(i, c))
657 			break;
658 		break;
659 	case ISDN_STAT_ADDCH:
660 		spin_lock_irqsave(&dev->lock, flags);
661 		if (isdn_add_channels(dev->drv[di], di, c->arg, 1)) {
662 			spin_unlock_irqrestore(&dev->lock, flags);
663 			return -1;
664 		}
665 		spin_unlock_irqrestore(&dev->lock, flags);
666 		isdn_info_update();
667 		break;
668 	case ISDN_STAT_DISCH:
669 		spin_lock_irqsave(&dev->lock, flags);
670 		for (i = 0; i < ISDN_MAX_CHANNELS; i++)
671 			if ((dev->drvmap[i] == di) &&
672 			    (dev->chanmap[i] == c->arg)) {
673 				if (c->parm.num[0])
674 					dev->usage[i] &= ~ISDN_USAGE_DISABLED;
675 				else
676 					if (USG_NONE(dev->usage[i])) {
677 						dev->usage[i] |= ISDN_USAGE_DISABLED;
678 					}
679 					else
680 						retval = -1;
681 				break;
682 			}
683 		spin_unlock_irqrestore(&dev->lock, flags);
684 		isdn_info_update();
685 		break;
686 	case ISDN_STAT_UNLOAD:
687 		while (dev->drv[di]->locks > 0) {
688 			isdn_unlock_driver(dev->drv[di]);
689 		}
690 		spin_lock_irqsave(&dev->lock, flags);
691 		isdn_tty_stat_callback(i, c);
692 		for (i = 0; i < ISDN_MAX_CHANNELS; i++)
693 			if (dev->drvmap[i] == di) {
694 				dev->drvmap[i] = -1;
695 				dev->chanmap[i] = -1;
696 				dev->usage[i] &= ~ISDN_USAGE_DISABLED;
697 			}
698 		dev->drivers--;
699 		dev->channels -= dev->drv[di]->channels;
700 		kfree(dev->drv[di]->rcverr);
701 		kfree(dev->drv[di]->rcvcount);
702 		for (i = 0; i < dev->drv[di]->channels; i++)
703 			skb_queue_purge(&dev->drv[di]->rpqueue[i]);
704 		kfree(dev->drv[di]->rpqueue);
705 		kfree(dev->drv[di]->rcv_waitq);
706 		kfree(dev->drv[di]);
707 		dev->drv[di] = NULL;
708 		dev->drvid[di][0] = '\0';
709 		isdn_info_update();
710 		set_global_features();
711 		spin_unlock_irqrestore(&dev->lock, flags);
712 		return 0;
713 	case ISDN_STAT_L1ERR:
714 		break;
715 	case CAPI_PUT_MESSAGE:
716 		return (isdn_capi_rec_hl_msg(&c->parm.cmsg));
717 #ifdef CONFIG_ISDN_TTY_FAX
718 	case ISDN_STAT_FAXIND:
719 		isdn_tty_stat_callback(i, c);
720 		break;
721 #endif
722 #ifdef CONFIG_ISDN_AUDIO
723 	case ISDN_STAT_AUDIO:
724 		isdn_tty_stat_callback(i, c);
725 		break;
726 #endif
727 #ifdef CONFIG_ISDN_DIVERSION
728 	case ISDN_STAT_PROT:
729 	case ISDN_STAT_REDIR:
730 		if (divert_if)
731 			return (divert_if->stat_callback(c));
732 #endif /* CONFIG_ISDN_DIVERSION */
733 	default:
734 		return -1;
735 	}
736 	return 0;
737 }
738 
739 /*
740  * Get integer from char-pointer, set pointer to end of number
741  */
742 int
isdn_getnum(char ** p)743 isdn_getnum(char **p)
744 {
745 	int v = -1;
746 
747 	while (*p[0] >= '0' && *p[0] <= '9')
748 		v = ((v < 0) ? 0 : (v * 10)) + (int) ((*p[0]++) - '0');
749 	return v;
750 }
751 
752 #define DLE 0x10
753 
754 /*
755  * isdn_readbchan() tries to get data from the read-queue.
756  * It MUST be called with interrupts off.
757  *
758  * Be aware that this is not an atomic operation when sleep != 0, even though
759  * interrupts are turned off! Well, like that we are currently only called
760  * on behalf of a read system call on raw device files (which are documented
761  * to be dangerous and for debugging purpose only). The inode semaphore
762  * takes care that this is not called for the same minor device number while
763  * we are sleeping, but access is not serialized against simultaneous read()
764  * from the corresponding ttyI device. Can other ugly events, like changes
765  * of the mapping (di,ch)<->minor, happen during the sleep? --he
766  */
767 int
isdn_readbchan(int di,int channel,u_char * buf,u_char * fp,int len,wait_queue_head_t * sleep)768 isdn_readbchan(int di, int channel, u_char *buf, u_char *fp, int len, wait_queue_head_t *sleep)
769 {
770 	int count;
771 	int count_pull;
772 	int count_put;
773 	int dflag;
774 	struct sk_buff *skb;
775 	u_char *cp;
776 
777 	if (!dev->drv[di])
778 		return 0;
779 	if (skb_queue_empty(&dev->drv[di]->rpqueue[channel])) {
780 		if (sleep)
781 			interruptible_sleep_on(sleep);
782 		else
783 			return 0;
784 	}
785 	if (len > dev->drv[di]->rcvcount[channel])
786 		len = dev->drv[di]->rcvcount[channel];
787 	cp = buf;
788 	count = 0;
789 	while (len) {
790 		if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
791 			break;
792 #ifdef CONFIG_ISDN_AUDIO
793 		if (ISDN_AUDIO_SKB_LOCK(skb))
794 			break;
795 		ISDN_AUDIO_SKB_LOCK(skb) = 1;
796 		if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
797 			char *p = skb->data;
798 			unsigned long DLEmask = (1 << channel);
799 
800 			dflag = 0;
801 			count_pull = count_put = 0;
802 			while ((count_pull < skb->len) && (len > 0)) {
803 				len--;
804 				if (dev->drv[di]->DLEflag & DLEmask) {
805 					*cp++ = DLE;
806 					dev->drv[di]->DLEflag &= ~DLEmask;
807 				} else {
808 					*cp++ = *p;
809 					if (*p == DLE) {
810 						dev->drv[di]->DLEflag |= DLEmask;
811 						(ISDN_AUDIO_SKB_DLECOUNT(skb))--;
812 					}
813 					p++;
814 					count_pull++;
815 				}
816 				count_put++;
817 			}
818 			if (count_pull >= skb->len)
819 				dflag = 1;
820 		} else {
821 #endif
822 			/* No DLE's in buff, so simply copy it */
823 			dflag = 1;
824 			if ((count_pull = skb->len) > len) {
825 				count_pull = len;
826 				dflag = 0;
827 			}
828 			count_put = count_pull;
829 			skb_copy_from_linear_data(skb, cp, count_put);
830 			cp += count_put;
831 			len -= count_put;
832 #ifdef CONFIG_ISDN_AUDIO
833 		}
834 #endif
835 		count += count_put;
836 		if (fp) {
837 			memset(fp, 0, count_put);
838 			fp += count_put;
839 		}
840 		if (dflag) {
841 			/* We got all the data in this buff.
842 			 * Now we can dequeue it.
843 			 */
844 			if (fp)
845 				*(fp - 1) = 0xff;
846 #ifdef CONFIG_ISDN_AUDIO
847 			ISDN_AUDIO_SKB_LOCK(skb) = 0;
848 #endif
849 			skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
850 			dev_kfree_skb(skb);
851 		} else {
852 			/* Not yet emptied this buff, so it
853 			 * must stay in the queue, for further calls
854 			 * but we pull off the data we got until now.
855 			 */
856 			skb_pull(skb, count_pull);
857 #ifdef CONFIG_ISDN_AUDIO
858 			ISDN_AUDIO_SKB_LOCK(skb) = 0;
859 #endif
860 		}
861 		dev->drv[di]->rcvcount[channel] -= count_put;
862 	}
863 	return count;
864 }
865 
866 /*
867  * isdn_readbchan_tty() tries to get data from the read-queue.
868  * It MUST be called with interrupts off.
869  *
870  * Be aware that this is not an atomic operation when sleep != 0, even though
871  * interrupts are turned off! Well, like that we are currently only called
872  * on behalf of a read system call on raw device files (which are documented
873  * to be dangerous and for debugging purpose only). The inode semaphore
874  * takes care that this is not called for the same minor device number while
875  * we are sleeping, but access is not serialized against simultaneous read()
876  * from the corresponding ttyI device. Can other ugly events, like changes
877  * of the mapping (di,ch)<->minor, happen during the sleep? --he
878  */
879 int
isdn_readbchan_tty(int di,int channel,struct tty_struct * tty,int cisco_hack)880 isdn_readbchan_tty(int di, int channel, struct tty_struct *tty, int cisco_hack)
881 {
882 	int count;
883 	int count_pull;
884 	int count_put;
885 	int dflag;
886 	struct sk_buff *skb;
887 	char last = 0;
888 	int len;
889 
890 	if (!dev->drv[di])
891 		return 0;
892 	if (skb_queue_empty(&dev->drv[di]->rpqueue[channel]))
893 		return 0;
894 
895 	len = tty_buffer_request_room(tty, dev->drv[di]->rcvcount[channel]);
896 	if (len == 0)
897 		return len;
898 
899 	count = 0;
900 	while (len) {
901 		if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
902 			break;
903 #ifdef CONFIG_ISDN_AUDIO
904 		if (ISDN_AUDIO_SKB_LOCK(skb))
905 			break;
906 		ISDN_AUDIO_SKB_LOCK(skb) = 1;
907 		if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
908 			char *p = skb->data;
909 			unsigned long DLEmask = (1 << channel);
910 
911 			dflag = 0;
912 			count_pull = count_put = 0;
913 			while ((count_pull < skb->len) && (len > 0)) {
914 				/* push every character but the last to the tty buffer directly */
915 				if (count_put)
916 					tty_insert_flip_char(tty, last, TTY_NORMAL);
917 				len--;
918 				if (dev->drv[di]->DLEflag & DLEmask) {
919 					last = DLE;
920 					dev->drv[di]->DLEflag &= ~DLEmask;
921 				} else {
922 					last = *p;
923 					if (last == DLE) {
924 						dev->drv[di]->DLEflag |= DLEmask;
925 						(ISDN_AUDIO_SKB_DLECOUNT(skb))--;
926 					}
927 					p++;
928 					count_pull++;
929 				}
930 				count_put++;
931 			}
932 			if (count_pull >= skb->len)
933 				dflag = 1;
934 		} else {
935 #endif
936 			/* No DLE's in buff, so simply copy it */
937 			dflag = 1;
938 			if ((count_pull = skb->len) > len) {
939 				count_pull = len;
940 				dflag = 0;
941 			}
942 			count_put = count_pull;
943 			if (count_put > 1)
944 				tty_insert_flip_string(tty, skb->data, count_put - 1);
945 			last = skb->data[count_put - 1];
946 			len -= count_put;
947 #ifdef CONFIG_ISDN_AUDIO
948 		}
949 #endif
950 		count += count_put;
951 		if (dflag) {
952 			/* We got all the data in this buff.
953 			 * Now we can dequeue it.
954 			 */
955 			if (cisco_hack)
956 				tty_insert_flip_char(tty, last, 0xFF);
957 			else
958 				tty_insert_flip_char(tty, last, TTY_NORMAL);
959 #ifdef CONFIG_ISDN_AUDIO
960 			ISDN_AUDIO_SKB_LOCK(skb) = 0;
961 #endif
962 			skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
963 			dev_kfree_skb(skb);
964 		} else {
965 			tty_insert_flip_char(tty, last, TTY_NORMAL);
966 			/* Not yet emptied this buff, so it
967 			 * must stay in the queue, for further calls
968 			 * but we pull off the data we got until now.
969 			 */
970 			skb_pull(skb, count_pull);
971 #ifdef CONFIG_ISDN_AUDIO
972 			ISDN_AUDIO_SKB_LOCK(skb) = 0;
973 #endif
974 		}
975 		dev->drv[di]->rcvcount[channel] -= count_put;
976 	}
977 	return count;
978 }
979 
980 
981 static inline int
isdn_minor2drv(int minor)982 isdn_minor2drv(int minor)
983 {
984 	return (dev->drvmap[minor]);
985 }
986 
987 static inline int
isdn_minor2chan(int minor)988 isdn_minor2chan(int minor)
989 {
990 	return (dev->chanmap[minor]);
991 }
992 
993 static char *
isdn_statstr(void)994 isdn_statstr(void)
995 {
996 	static char istatbuf[2048];
997 	char *p;
998 	int i;
999 
1000 	sprintf(istatbuf, "idmap:\t");
1001 	p = istatbuf + strlen(istatbuf);
1002 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1003 		sprintf(p, "%s ", (dev->drvmap[i] < 0) ? "-" : dev->drvid[dev->drvmap[i]]);
1004 		p = istatbuf + strlen(istatbuf);
1005 	}
1006 	sprintf(p, "\nchmap:\t");
1007 	p = istatbuf + strlen(istatbuf);
1008 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1009 		sprintf(p, "%d ", dev->chanmap[i]);
1010 		p = istatbuf + strlen(istatbuf);
1011 	}
1012 	sprintf(p, "\ndrmap:\t");
1013 	p = istatbuf + strlen(istatbuf);
1014 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1015 		sprintf(p, "%d ", dev->drvmap[i]);
1016 		p = istatbuf + strlen(istatbuf);
1017 	}
1018 	sprintf(p, "\nusage:\t");
1019 	p = istatbuf + strlen(istatbuf);
1020 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1021 		sprintf(p, "%d ", dev->usage[i]);
1022 		p = istatbuf + strlen(istatbuf);
1023 	}
1024 	sprintf(p, "\nflags:\t");
1025 	p = istatbuf + strlen(istatbuf);
1026 	for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
1027 		if (dev->drv[i]) {
1028 			sprintf(p, "%ld ", dev->drv[i]->online);
1029 			p = istatbuf + strlen(istatbuf);
1030 		} else {
1031 			sprintf(p, "? ");
1032 			p = istatbuf + strlen(istatbuf);
1033 		}
1034 	}
1035 	sprintf(p, "\nphone:\t");
1036 	p = istatbuf + strlen(istatbuf);
1037 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1038 		sprintf(p, "%s ", dev->num[i]);
1039 		p = istatbuf + strlen(istatbuf);
1040 	}
1041 	sprintf(p, "\n");
1042 	return istatbuf;
1043 }
1044 
1045 /* Module interface-code */
1046 
1047 void
isdn_info_update(void)1048 isdn_info_update(void)
1049 {
1050 	infostruct *p = dev->infochain;
1051 
1052 	while (p) {
1053 		*(p->private) = 1;
1054 		p = (infostruct *) p->next;
1055 	}
1056 	wake_up_interruptible(&(dev->info_waitq));
1057 }
1058 
1059 static ssize_t
isdn_read(struct file * file,char __user * buf,size_t count,loff_t * off)1060 isdn_read(struct file *file, char __user *buf, size_t count, loff_t *off)
1061 {
1062 	uint minor = iminor(file->f_path.dentry->d_inode);
1063 	int len = 0;
1064 	int drvidx;
1065 	int chidx;
1066 	int retval;
1067 	char *p;
1068 
1069 	mutex_lock(&isdn_mutex);
1070 	if (minor == ISDN_MINOR_STATUS) {
1071 		if (!file->private_data) {
1072 			if (file->f_flags & O_NONBLOCK) {
1073 				retval = -EAGAIN;
1074 				goto out;
1075 			}
1076 			interruptible_sleep_on(&(dev->info_waitq));
1077 		}
1078 		p = isdn_statstr();
1079 		file->private_data = NULL;
1080 		if ((len = strlen(p)) <= count) {
1081 			if (copy_to_user(buf, p, len)) {
1082 				retval = -EFAULT;
1083 				goto out;
1084 			}
1085 			*off += len;
1086 			retval = len;
1087 			goto out;
1088 		}
1089 		retval = 0;
1090 		goto out;
1091 	}
1092 	if (!dev->drivers) {
1093 		retval = -ENODEV;
1094 		goto out;
1095 	}
1096 	if (minor <= ISDN_MINOR_BMAX) {
1097 		printk(KERN_WARNING "isdn_read minor %d obsolete!\n", minor);
1098 		drvidx = isdn_minor2drv(minor);
1099 		if (drvidx < 0) {
1100 			retval = -ENODEV;
1101 			goto out;
1102 		}
1103 		if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1104 			retval = -ENODEV;
1105 			goto out;
1106 		}
1107 		chidx = isdn_minor2chan(minor);
1108 		if (!(p = kmalloc(count, GFP_KERNEL))) {
1109 			retval = -ENOMEM;
1110 			goto out;
1111 		}
1112 		len = isdn_readbchan(drvidx, chidx, p, NULL, count,
1113 				     &dev->drv[drvidx]->rcv_waitq[chidx]);
1114 		*off += len;
1115 		if (copy_to_user(buf, p, len))
1116 			len = -EFAULT;
1117 		kfree(p);
1118 		retval = len;
1119 		goto out;
1120 	}
1121 	if (minor <= ISDN_MINOR_CTRLMAX) {
1122 		drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1123 		if (drvidx < 0) {
1124 			retval = -ENODEV;
1125 			goto out;
1126 		}
1127 		if (!dev->drv[drvidx]->stavail) {
1128 			if (file->f_flags & O_NONBLOCK) {
1129 				retval = -EAGAIN;
1130 				goto out;
1131 			}
1132 			interruptible_sleep_on(&(dev->drv[drvidx]->st_waitq));
1133 		}
1134 		if (dev->drv[drvidx]->interface->readstat) {
1135 			if (count > dev->drv[drvidx]->stavail)
1136 				count = dev->drv[drvidx]->stavail;
1137 			len = dev->drv[drvidx]->interface->readstat(buf, count,
1138 								    drvidx, isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1139 			if (len < 0) {
1140 				retval = len;
1141 				goto out;
1142 			}
1143 		} else {
1144 			len = 0;
1145 		}
1146 		if (len)
1147 			dev->drv[drvidx]->stavail -= len;
1148 		else
1149 			dev->drv[drvidx]->stavail = 0;
1150 		*off += len;
1151 		retval = len;
1152 		goto out;
1153 	}
1154 #ifdef CONFIG_ISDN_PPP
1155 	if (minor <= ISDN_MINOR_PPPMAX) {
1156 		retval = isdn_ppp_read(minor - ISDN_MINOR_PPP, file, buf, count);
1157 		goto out;
1158 	}
1159 #endif
1160 	retval = -ENODEV;
1161 out:
1162 	mutex_unlock(&isdn_mutex);
1163 	return retval;
1164 }
1165 
1166 static ssize_t
isdn_write(struct file * file,const char __user * buf,size_t count,loff_t * off)1167 isdn_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
1168 {
1169 	uint minor = iminor(file->f_path.dentry->d_inode);
1170 	int drvidx;
1171 	int chidx;
1172 	int retval;
1173 
1174 	if (minor == ISDN_MINOR_STATUS)
1175 		return -EPERM;
1176 	if (!dev->drivers)
1177 		return -ENODEV;
1178 
1179 	mutex_lock(&isdn_mutex);
1180 	if (minor <= ISDN_MINOR_BMAX) {
1181 		printk(KERN_WARNING "isdn_write minor %d obsolete!\n", minor);
1182 		drvidx = isdn_minor2drv(minor);
1183 		if (drvidx < 0) {
1184 			retval = -ENODEV;
1185 			goto out;
1186 		}
1187 		if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1188 			retval = -ENODEV;
1189 			goto out;
1190 		}
1191 		chidx = isdn_minor2chan(minor);
1192 		while ((retval = isdn_writebuf_stub(drvidx, chidx, buf, count)) == 0)
1193 			interruptible_sleep_on(&dev->drv[drvidx]->snd_waitq[chidx]);
1194 		goto out;
1195 	}
1196 	if (minor <= ISDN_MINOR_CTRLMAX) {
1197 		drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1198 		if (drvidx < 0) {
1199 			retval = -ENODEV;
1200 			goto out;
1201 		}
1202 		/*
1203 		 * We want to use the isdnctrl device to load the firmware
1204 		 *
1205 		 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1206 		 return -ENODEV;
1207 		*/
1208 		if (dev->drv[drvidx]->interface->writecmd)
1209 			retval = dev->drv[drvidx]->interface->
1210 				writecmd(buf, count, drvidx,
1211 					 isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1212 		else
1213 			retval = count;
1214 		goto out;
1215 	}
1216 #ifdef CONFIG_ISDN_PPP
1217 	if (minor <= ISDN_MINOR_PPPMAX) {
1218 		retval = isdn_ppp_write(minor - ISDN_MINOR_PPP, file, buf, count);
1219 		goto out;
1220 	}
1221 #endif
1222 	retval = -ENODEV;
1223 out:
1224 	mutex_unlock(&isdn_mutex);
1225 	return retval;
1226 }
1227 
1228 static unsigned int
isdn_poll(struct file * file,poll_table * wait)1229 isdn_poll(struct file *file, poll_table *wait)
1230 {
1231 	unsigned int mask = 0;
1232 	unsigned int minor = iminor(file->f_path.dentry->d_inode);
1233 	int drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1234 
1235 	mutex_lock(&isdn_mutex);
1236 	if (minor == ISDN_MINOR_STATUS) {
1237 		poll_wait(file, &(dev->info_waitq), wait);
1238 		/* mask = POLLOUT | POLLWRNORM; */
1239 		if (file->private_data) {
1240 			mask |= POLLIN | POLLRDNORM;
1241 		}
1242 		goto out;
1243 	}
1244 	if (minor >= ISDN_MINOR_CTRL && minor <= ISDN_MINOR_CTRLMAX) {
1245 		if (drvidx < 0) {
1246 			/* driver deregistered while file open */
1247 			mask = POLLHUP;
1248 			goto out;
1249 		}
1250 		poll_wait(file, &(dev->drv[drvidx]->st_waitq), wait);
1251 		mask = POLLOUT | POLLWRNORM;
1252 		if (dev->drv[drvidx]->stavail) {
1253 			mask |= POLLIN | POLLRDNORM;
1254 		}
1255 		goto out;
1256 	}
1257 #ifdef CONFIG_ISDN_PPP
1258 	if (minor <= ISDN_MINOR_PPPMAX) {
1259 		mask = isdn_ppp_poll(file, wait);
1260 		goto out;
1261 	}
1262 #endif
1263 	mask = POLLERR;
1264 out:
1265 	mutex_unlock(&isdn_mutex);
1266 	return mask;
1267 }
1268 
1269 
1270 static int
isdn_ioctl(struct file * file,uint cmd,ulong arg)1271 isdn_ioctl(struct file *file, uint cmd, ulong arg)
1272 {
1273 	uint minor = iminor(file->f_path.dentry->d_inode);
1274 	isdn_ctrl c;
1275 	int drvidx;
1276 	int ret;
1277 	int i;
1278 	char __user *p;
1279 	char *s;
1280 	union iocpar {
1281 		char name[10];
1282 		char bname[22];
1283 		isdn_ioctl_struct iocts;
1284 		isdn_net_ioctl_phone phone;
1285 		isdn_net_ioctl_cfg cfg;
1286 	} iocpar;
1287 	void __user *argp = (void __user *)arg;
1288 
1289 #define name  iocpar.name
1290 #define bname iocpar.bname
1291 #define iocts iocpar.iocts
1292 #define phone iocpar.phone
1293 #define cfg   iocpar.cfg
1294 
1295 	if (minor == ISDN_MINOR_STATUS) {
1296 		switch (cmd) {
1297 		case IIOCGETDVR:
1298 			return (TTY_DV +
1299 				(NET_DV << 8) +
1300 				(INF_DV << 16));
1301 		case IIOCGETCPS:
1302 			if (arg) {
1303 				ulong __user *p = argp;
1304 				int i;
1305 				if (!access_ok(VERIFY_WRITE, p,
1306 					       sizeof(ulong) * ISDN_MAX_CHANNELS * 2))
1307 					return -EFAULT;
1308 				for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1309 					put_user(dev->ibytes[i], p++);
1310 					put_user(dev->obytes[i], p++);
1311 				}
1312 				return 0;
1313 			} else
1314 				return -EINVAL;
1315 			break;
1316 #ifdef CONFIG_NETDEVICES
1317 		case IIOCNETGPN:
1318 			/* Get peer phone number of a connected
1319 			 * isdn network interface */
1320 			if (arg) {
1321 				if (copy_from_user(&phone, argp, sizeof(phone)))
1322 					return -EFAULT;
1323 				return isdn_net_getpeer(&phone, argp);
1324 			} else
1325 				return -EINVAL;
1326 #endif
1327 		default:
1328 			return -EINVAL;
1329 		}
1330 	}
1331 	if (!dev->drivers)
1332 		return -ENODEV;
1333 	if (minor <= ISDN_MINOR_BMAX) {
1334 		drvidx = isdn_minor2drv(minor);
1335 		if (drvidx < 0)
1336 			return -ENODEV;
1337 		if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1338 			return -ENODEV;
1339 		return 0;
1340 	}
1341 	if (minor <= ISDN_MINOR_CTRLMAX) {
1342 /*
1343  * isdn net devices manage lots of configuration variables as linked lists.
1344  * Those lists must only be manipulated from user space. Some of the ioctl's
1345  * service routines access user space and are not atomic. Therefore, ioctl's
1346  * manipulating the lists and ioctl's sleeping while accessing the lists
1347  * are serialized by means of a semaphore.
1348  */
1349 		switch (cmd) {
1350 		case IIOCNETDWRSET:
1351 			printk(KERN_INFO "INFO: ISDN_DW_ABC_EXTENSION not enabled\n");
1352 			return (-EINVAL);
1353 		case IIOCNETLCR:
1354 			printk(KERN_INFO "INFO: ISDN_ABC_LCR_SUPPORT not enabled\n");
1355 			return -ENODEV;
1356 #ifdef CONFIG_NETDEVICES
1357 		case IIOCNETAIF:
1358 			/* Add a network-interface */
1359 			if (arg) {
1360 				if (copy_from_user(name, argp, sizeof(name)))
1361 					return -EFAULT;
1362 				s = name;
1363 			} else {
1364 				s = NULL;
1365 			}
1366 			ret = mutex_lock_interruptible(&dev->mtx);
1367 			if (ret) return ret;
1368 			if ((s = isdn_net_new(s, NULL))) {
1369 				if (copy_to_user(argp, s, strlen(s) + 1)) {
1370 					ret = -EFAULT;
1371 				} else {
1372 					ret = 0;
1373 				}
1374 			} else
1375 				ret = -ENODEV;
1376 			mutex_unlock(&dev->mtx);
1377 			return ret;
1378 		case IIOCNETASL:
1379 			/* Add a slave to a network-interface */
1380 			if (arg) {
1381 				if (copy_from_user(bname, argp, sizeof(bname) - 1))
1382 					return -EFAULT;
1383 			} else
1384 				return -EINVAL;
1385 			ret = mutex_lock_interruptible(&dev->mtx);
1386 			if (ret) return ret;
1387 			if ((s = isdn_net_newslave(bname))) {
1388 				if (copy_to_user(argp, s, strlen(s) + 1)) {
1389 					ret = -EFAULT;
1390 				} else {
1391 					ret = 0;
1392 				}
1393 			} else
1394 				ret = -ENODEV;
1395 			mutex_unlock(&dev->mtx);
1396 			return ret;
1397 		case IIOCNETDIF:
1398 			/* Delete a network-interface */
1399 			if (arg) {
1400 				if (copy_from_user(name, argp, sizeof(name)))
1401 					return -EFAULT;
1402 				ret = mutex_lock_interruptible(&dev->mtx);
1403 				if (ret) return ret;
1404 				ret = isdn_net_rm(name);
1405 				mutex_unlock(&dev->mtx);
1406 				return ret;
1407 			} else
1408 				return -EINVAL;
1409 		case IIOCNETSCF:
1410 			/* Set configurable parameters of a network-interface */
1411 			if (arg) {
1412 				if (copy_from_user(&cfg, argp, sizeof(cfg)))
1413 					return -EFAULT;
1414 				return isdn_net_setcfg(&cfg);
1415 			} else
1416 				return -EINVAL;
1417 		case IIOCNETGCF:
1418 			/* Get configurable parameters of a network-interface */
1419 			if (arg) {
1420 				if (copy_from_user(&cfg, argp, sizeof(cfg)))
1421 					return -EFAULT;
1422 				if (!(ret = isdn_net_getcfg(&cfg))) {
1423 					if (copy_to_user(argp, &cfg, sizeof(cfg)))
1424 						return -EFAULT;
1425 				}
1426 				return ret;
1427 			} else
1428 				return -EINVAL;
1429 		case IIOCNETANM:
1430 			/* Add a phone-number to a network-interface */
1431 			if (arg) {
1432 				if (copy_from_user(&phone, argp, sizeof(phone)))
1433 					return -EFAULT;
1434 				ret = mutex_lock_interruptible(&dev->mtx);
1435 				if (ret) return ret;
1436 				ret = isdn_net_addphone(&phone);
1437 				mutex_unlock(&dev->mtx);
1438 				return ret;
1439 			} else
1440 				return -EINVAL;
1441 		case IIOCNETGNM:
1442 			/* Get list of phone-numbers of a network-interface */
1443 			if (arg) {
1444 				if (copy_from_user(&phone, argp, sizeof(phone)))
1445 					return -EFAULT;
1446 				ret = mutex_lock_interruptible(&dev->mtx);
1447 				if (ret) return ret;
1448 				ret = isdn_net_getphones(&phone, argp);
1449 				mutex_unlock(&dev->mtx);
1450 				return ret;
1451 			} else
1452 				return -EINVAL;
1453 		case IIOCNETDNM:
1454 			/* Delete a phone-number of a network-interface */
1455 			if (arg) {
1456 				if (copy_from_user(&phone, argp, sizeof(phone)))
1457 					return -EFAULT;
1458 				ret = mutex_lock_interruptible(&dev->mtx);
1459 				if (ret) return ret;
1460 				ret = isdn_net_delphone(&phone);
1461 				mutex_unlock(&dev->mtx);
1462 				return ret;
1463 			} else
1464 				return -EINVAL;
1465 		case IIOCNETDIL:
1466 			/* Force dialing of a network-interface */
1467 			if (arg) {
1468 				if (copy_from_user(name, argp, sizeof(name)))
1469 					return -EFAULT;
1470 				return isdn_net_force_dial(name);
1471 			} else
1472 				return -EINVAL;
1473 #ifdef CONFIG_ISDN_PPP
1474 		case IIOCNETALN:
1475 			if (!arg)
1476 				return -EINVAL;
1477 			if (copy_from_user(name, argp, sizeof(name)))
1478 				return -EFAULT;
1479 			return isdn_ppp_dial_slave(name);
1480 		case IIOCNETDLN:
1481 			if (!arg)
1482 				return -EINVAL;
1483 			if (copy_from_user(name, argp, sizeof(name)))
1484 				return -EFAULT;
1485 			return isdn_ppp_hangup_slave(name);
1486 #endif
1487 		case IIOCNETHUP:
1488 			/* Force hangup of a network-interface */
1489 			if (!arg)
1490 				return -EINVAL;
1491 			if (copy_from_user(name, argp, sizeof(name)))
1492 				return -EFAULT;
1493 			return isdn_net_force_hangup(name);
1494 			break;
1495 #endif                          /* CONFIG_NETDEVICES */
1496 		case IIOCSETVER:
1497 			dev->net_verbose = arg;
1498 			printk(KERN_INFO "isdn: Verbose-Level is %d\n", dev->net_verbose);
1499 			return 0;
1500 		case IIOCSETGST:
1501 			if (arg)
1502 				dev->global_flags |= ISDN_GLOBAL_STOPPED;
1503 			else
1504 				dev->global_flags &= ~ISDN_GLOBAL_STOPPED;
1505 			printk(KERN_INFO "isdn: Global Mode %s\n",
1506 			       (dev->global_flags & ISDN_GLOBAL_STOPPED) ? "stopped" : "running");
1507 			return 0;
1508 		case IIOCSETBRJ:
1509 			drvidx = -1;
1510 			if (arg) {
1511 				int i;
1512 				char *p;
1513 				if (copy_from_user(&iocts, argp,
1514 						   sizeof(isdn_ioctl_struct)))
1515 					return -EFAULT;
1516 				iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1517 				if (strlen(iocts.drvid)) {
1518 					if ((p = strchr(iocts.drvid, ',')))
1519 						*p = 0;
1520 					drvidx = -1;
1521 					for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1522 						if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1523 							drvidx = i;
1524 							break;
1525 						}
1526 				}
1527 			}
1528 			if (drvidx == -1)
1529 				return -ENODEV;
1530 			if (iocts.arg)
1531 				dev->drv[drvidx]->flags |= DRV_FLAG_REJBUS;
1532 			else
1533 				dev->drv[drvidx]->flags &= ~DRV_FLAG_REJBUS;
1534 			return 0;
1535 		case IIOCSIGPRF:
1536 			dev->profd = current;
1537 			return 0;
1538 			break;
1539 		case IIOCGETPRF:
1540 			/* Get all Modem-Profiles */
1541 			if (arg) {
1542 				char __user *p = argp;
1543 				int i;
1544 
1545 				if (!access_ok(VERIFY_WRITE, argp,
1546 					       (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
1547 					       * ISDN_MAX_CHANNELS))
1548 					return -EFAULT;
1549 
1550 				for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1551 					if (copy_to_user(p, dev->mdm.info[i].emu.profile,
1552 							 ISDN_MODEM_NUMREG))
1553 						return -EFAULT;
1554 					p += ISDN_MODEM_NUMREG;
1555 					if (copy_to_user(p, dev->mdm.info[i].emu.pmsn, ISDN_MSNLEN))
1556 						return -EFAULT;
1557 					p += ISDN_MSNLEN;
1558 					if (copy_to_user(p, dev->mdm.info[i].emu.plmsn, ISDN_LMSNLEN))
1559 						return -EFAULT;
1560 					p += ISDN_LMSNLEN;
1561 				}
1562 				return (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN) * ISDN_MAX_CHANNELS;
1563 			} else
1564 				return -EINVAL;
1565 			break;
1566 		case IIOCSETPRF:
1567 			/* Set all Modem-Profiles */
1568 			if (arg) {
1569 				char __user *p = argp;
1570 				int i;
1571 
1572 				if (!access_ok(VERIFY_READ, argp,
1573 					       (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
1574 					       * ISDN_MAX_CHANNELS))
1575 					return -EFAULT;
1576 
1577 				for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1578 					if (copy_from_user(dev->mdm.info[i].emu.profile, p,
1579 							   ISDN_MODEM_NUMREG))
1580 						return -EFAULT;
1581 					p += ISDN_MODEM_NUMREG;
1582 					if (copy_from_user(dev->mdm.info[i].emu.plmsn, p, ISDN_LMSNLEN))
1583 						return -EFAULT;
1584 					p += ISDN_LMSNLEN;
1585 					if (copy_from_user(dev->mdm.info[i].emu.pmsn, p, ISDN_MSNLEN))
1586 						return -EFAULT;
1587 					p += ISDN_MSNLEN;
1588 				}
1589 				return 0;
1590 			} else
1591 				return -EINVAL;
1592 			break;
1593 		case IIOCSETMAP:
1594 		case IIOCGETMAP:
1595 			/* Set/Get MSN->EAZ-Mapping for a driver */
1596 			if (arg) {
1597 
1598 				if (copy_from_user(&iocts, argp,
1599 						   sizeof(isdn_ioctl_struct)))
1600 					return -EFAULT;
1601 				iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1602 				if (strlen(iocts.drvid)) {
1603 					drvidx = -1;
1604 					for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1605 						if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1606 							drvidx = i;
1607 							break;
1608 						}
1609 				} else
1610 					drvidx = 0;
1611 				if (drvidx == -1)
1612 					return -ENODEV;
1613 				if (cmd == IIOCSETMAP) {
1614 					int loop = 1;
1615 
1616 					p = (char __user *) iocts.arg;
1617 					i = 0;
1618 					while (loop) {
1619 						int j = 0;
1620 
1621 						while (1) {
1622 							if (!access_ok(VERIFY_READ, p, 1))
1623 								return -EFAULT;
1624 							get_user(bname[j], p++);
1625 							switch (bname[j]) {
1626 							case '\0':
1627 								loop = 0;
1628 								/* Fall through */
1629 							case ',':
1630 								bname[j] = '\0';
1631 								strcpy(dev->drv[drvidx]->msn2eaz[i], bname);
1632 								j = ISDN_MSNLEN;
1633 								break;
1634 							default:
1635 								j++;
1636 							}
1637 							if (j >= ISDN_MSNLEN)
1638 								break;
1639 						}
1640 						if (++i > 9)
1641 							break;
1642 					}
1643 				} else {
1644 					p = (char __user *) iocts.arg;
1645 					for (i = 0; i < 10; i++) {
1646 						snprintf(bname, sizeof(bname), "%s%s",
1647 							 strlen(dev->drv[drvidx]->msn2eaz[i]) ?
1648 							 dev->drv[drvidx]->msn2eaz[i] : "_",
1649 							 (i < 9) ? "," : "\0");
1650 						if (copy_to_user(p, bname, strlen(bname) + 1))
1651 							return -EFAULT;
1652 						p += strlen(bname);
1653 					}
1654 				}
1655 				return 0;
1656 			} else
1657 				return -EINVAL;
1658 		case IIOCDBGVAR:
1659 			if (arg) {
1660 				if (copy_to_user(argp, &dev, sizeof(ulong)))
1661 					return -EFAULT;
1662 				return 0;
1663 			} else
1664 				return -EINVAL;
1665 			break;
1666 		default:
1667 			if ((cmd & IIOCDRVCTL) == IIOCDRVCTL)
1668 				cmd = ((cmd >> _IOC_NRSHIFT) & _IOC_NRMASK) & ISDN_DRVIOCTL_MASK;
1669 			else
1670 				return -EINVAL;
1671 			if (arg) {
1672 				int i;
1673 				char *p;
1674 				if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct)))
1675 					return -EFAULT;
1676 				iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1677 				if (strlen(iocts.drvid)) {
1678 					if ((p = strchr(iocts.drvid, ',')))
1679 						*p = 0;
1680 					drvidx = -1;
1681 					for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1682 						if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1683 							drvidx = i;
1684 							break;
1685 						}
1686 				} else
1687 					drvidx = 0;
1688 				if (drvidx == -1)
1689 					return -ENODEV;
1690 				if (!access_ok(VERIFY_WRITE, argp,
1691 					       sizeof(isdn_ioctl_struct)))
1692 					return -EFAULT;
1693 				c.driver = drvidx;
1694 				c.command = ISDN_CMD_IOCTL;
1695 				c.arg = cmd;
1696 				memcpy(c.parm.num, &iocts.arg, sizeof(ulong));
1697 				ret = isdn_command(&c);
1698 				memcpy(&iocts.arg, c.parm.num, sizeof(ulong));
1699 				if (copy_to_user(argp, &iocts, sizeof(isdn_ioctl_struct)))
1700 					return -EFAULT;
1701 				return ret;
1702 			} else
1703 				return -EINVAL;
1704 		}
1705 	}
1706 #ifdef CONFIG_ISDN_PPP
1707 	if (minor <= ISDN_MINOR_PPPMAX)
1708 		return (isdn_ppp_ioctl(minor - ISDN_MINOR_PPP, file, cmd, arg));
1709 #endif
1710 	return -ENODEV;
1711 
1712 #undef name
1713 #undef bname
1714 #undef iocts
1715 #undef phone
1716 #undef cfg
1717 }
1718 
1719 static long
isdn_unlocked_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1720 isdn_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1721 {
1722 	int ret;
1723 
1724 	mutex_lock(&isdn_mutex);
1725 	ret = isdn_ioctl(file, cmd, arg);
1726 	mutex_unlock(&isdn_mutex);
1727 
1728 	return ret;
1729 }
1730 
1731 /*
1732  * Open the device code.
1733  */
1734 static int
isdn_open(struct inode * ino,struct file * filep)1735 isdn_open(struct inode *ino, struct file *filep)
1736 {
1737 	uint minor = iminor(ino);
1738 	int drvidx;
1739 	int chidx;
1740 	int retval = -ENODEV;
1741 
1742 	mutex_lock(&isdn_mutex);
1743 	if (minor == ISDN_MINOR_STATUS) {
1744 		infostruct *p;
1745 
1746 		if ((p = kmalloc(sizeof(infostruct), GFP_KERNEL))) {
1747 			p->next = (char *) dev->infochain;
1748 			p->private = (char *) &(filep->private_data);
1749 			dev->infochain = p;
1750 			/* At opening we allow a single update */
1751 			filep->private_data = (char *) 1;
1752 			retval = 0;
1753 			goto out;
1754 		} else {
1755 			retval = -ENOMEM;
1756 			goto out;
1757 		}
1758 	}
1759 	if (!dev->channels)
1760 		goto out;
1761 	if (minor <= ISDN_MINOR_BMAX) {
1762 		printk(KERN_WARNING "isdn_open minor %d obsolete!\n", minor);
1763 		drvidx = isdn_minor2drv(minor);
1764 		if (drvidx < 0)
1765 			goto out;
1766 		chidx = isdn_minor2chan(minor);
1767 		if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1768 			goto out;
1769 		if (!(dev->drv[drvidx]->online & (1 << chidx)))
1770 			goto out;
1771 		isdn_lock_drivers();
1772 		retval = 0;
1773 		goto out;
1774 	}
1775 	if (minor <= ISDN_MINOR_CTRLMAX) {
1776 		drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1777 		if (drvidx < 0)
1778 			goto out;
1779 		isdn_lock_drivers();
1780 		retval = 0;
1781 		goto out;
1782 	}
1783 #ifdef CONFIG_ISDN_PPP
1784 	if (minor <= ISDN_MINOR_PPPMAX) {
1785 		retval = isdn_ppp_open(minor - ISDN_MINOR_PPP, filep);
1786 		if (retval == 0)
1787 			isdn_lock_drivers();
1788 		goto out;
1789 	}
1790 #endif
1791 out:
1792 	nonseekable_open(ino, filep);
1793 	mutex_unlock(&isdn_mutex);
1794 	return retval;
1795 }
1796 
1797 static int
isdn_close(struct inode * ino,struct file * filep)1798 isdn_close(struct inode *ino, struct file *filep)
1799 {
1800 	uint minor = iminor(ino);
1801 
1802 	mutex_lock(&isdn_mutex);
1803 	if (minor == ISDN_MINOR_STATUS) {
1804 		infostruct *p = dev->infochain;
1805 		infostruct *q = NULL;
1806 
1807 		while (p) {
1808 			if (p->private == (char *) &(filep->private_data)) {
1809 				if (q)
1810 					q->next = p->next;
1811 				else
1812 					dev->infochain = (infostruct *) (p->next);
1813 				kfree(p);
1814 				goto out;
1815 			}
1816 			q = p;
1817 			p = (infostruct *) (p->next);
1818 		}
1819 		printk(KERN_WARNING "isdn: No private data while closing isdnctrl\n");
1820 		goto out;
1821 	}
1822 	isdn_unlock_drivers();
1823 	if (minor <= ISDN_MINOR_BMAX)
1824 		goto out;
1825 	if (minor <= ISDN_MINOR_CTRLMAX) {
1826 		if (dev->profd == current)
1827 			dev->profd = NULL;
1828 		goto out;
1829 	}
1830 #ifdef CONFIG_ISDN_PPP
1831 	if (minor <= ISDN_MINOR_PPPMAX)
1832 		isdn_ppp_release(minor - ISDN_MINOR_PPP, filep);
1833 #endif
1834 
1835 out:
1836 	mutex_unlock(&isdn_mutex);
1837 	return 0;
1838 }
1839 
1840 static const struct file_operations isdn_fops =
1841 {
1842 	.owner		= THIS_MODULE,
1843 	.llseek		= no_llseek,
1844 	.read		= isdn_read,
1845 	.write		= isdn_write,
1846 	.poll		= isdn_poll,
1847 	.unlocked_ioctl	= isdn_unlocked_ioctl,
1848 	.open		= isdn_open,
1849 	.release	= isdn_close,
1850 };
1851 
1852 char *
isdn_map_eaz2msn(char * msn,int di)1853 isdn_map_eaz2msn(char *msn, int di)
1854 {
1855 	isdn_driver_t *this = dev->drv[di];
1856 	int i;
1857 
1858 	if (strlen(msn) == 1) {
1859 		i = msn[0] - '0';
1860 		if ((i >= 0) && (i <= 9))
1861 			if (strlen(this->msn2eaz[i]))
1862 				return (this->msn2eaz[i]);
1863 	}
1864 	return (msn);
1865 }
1866 
1867 /*
1868  * Find an unused ISDN-channel, whose feature-flags match the
1869  * given L2- and L3-protocols.
1870  */
1871 #define L2V (~(ISDN_FEATURE_L2_V11096 | ISDN_FEATURE_L2_V11019 | ISDN_FEATURE_L2_V11038))
1872 
1873 /*
1874  * This function must be called with holding the dev->lock.
1875  */
1876 int
isdn_get_free_channel(int usage,int l2_proto,int l3_proto,int pre_dev,int pre_chan,char * msn)1877 isdn_get_free_channel(int usage, int l2_proto, int l3_proto, int pre_dev
1878 		      , int pre_chan, char *msn)
1879 {
1880 	int i;
1881 	ulong features;
1882 	ulong vfeatures;
1883 
1884 	features = ((1 << l2_proto) | (0x10000 << l3_proto));
1885 	vfeatures = (((1 << l2_proto) | (0x10000 << l3_proto)) &
1886 		     ~(ISDN_FEATURE_L2_V11096 | ISDN_FEATURE_L2_V11019 | ISDN_FEATURE_L2_V11038));
1887 	/* If Layer-2 protocol is V.110, accept drivers with
1888 	 * transparent feature even if these don't support V.110
1889 	 * because we can emulate this in linklevel.
1890 	 */
1891 	for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1892 		if (USG_NONE(dev->usage[i]) &&
1893 		    (dev->drvmap[i] != -1)) {
1894 			int d = dev->drvmap[i];
1895 			if ((dev->usage[i] & ISDN_USAGE_EXCLUSIVE) &&
1896 			    ((pre_dev != d) || (pre_chan != dev->chanmap[i])))
1897 				continue;
1898 			if (!strcmp(isdn_map_eaz2msn(msn, d), "-"))
1899 				continue;
1900 			if (dev->usage[i] & ISDN_USAGE_DISABLED)
1901 				continue; /* usage not allowed */
1902 			if (dev->drv[d]->flags & DRV_FLAG_RUNNING) {
1903 				if (((dev->drv[d]->interface->features & features) == features) ||
1904 				    (((dev->drv[d]->interface->features & vfeatures) == vfeatures) &&
1905 				     (dev->drv[d]->interface->features & ISDN_FEATURE_L2_TRANS))) {
1906 					if ((pre_dev < 0) || (pre_chan < 0)) {
1907 						dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1908 						dev->usage[i] |= usage;
1909 						isdn_info_update();
1910 						return i;
1911 					} else {
1912 						if ((pre_dev == d) && (pre_chan == dev->chanmap[i])) {
1913 							dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1914 							dev->usage[i] |= usage;
1915 							isdn_info_update();
1916 							return i;
1917 						}
1918 					}
1919 				}
1920 			}
1921 		}
1922 	return -1;
1923 }
1924 
1925 /*
1926  * Set state of ISDN-channel to 'unused'
1927  */
1928 void
isdn_free_channel(int di,int ch,int usage)1929 isdn_free_channel(int di, int ch, int usage)
1930 {
1931 	int i;
1932 
1933 	if ((di < 0) || (ch < 0)) {
1934 		printk(KERN_WARNING "%s: called with invalid drv(%d) or channel(%d)\n",
1935 		       __func__, di, ch);
1936 		return;
1937 	}
1938 	for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1939 		if (((!usage) || ((dev->usage[i] & ISDN_USAGE_MASK) == usage)) &&
1940 		    (dev->drvmap[i] == di) &&
1941 		    (dev->chanmap[i] == ch)) {
1942 			dev->usage[i] &= (ISDN_USAGE_NONE | ISDN_USAGE_EXCLUSIVE);
1943 			strcpy(dev->num[i], "???");
1944 			dev->ibytes[i] = 0;
1945 			dev->obytes[i] = 0;
1946 // 20.10.99 JIM, try to reinitialize v110 !
1947 			dev->v110emu[i] = 0;
1948 			atomic_set(&(dev->v110use[i]), 0);
1949 			isdn_v110_close(dev->v110[i]);
1950 			dev->v110[i] = NULL;
1951 // 20.10.99 JIM, try to reinitialize v110 !
1952 			isdn_info_update();
1953 			if (dev->drv[di])
1954 				skb_queue_purge(&dev->drv[di]->rpqueue[ch]);
1955 		}
1956 }
1957 
1958 /*
1959  * Cancel Exclusive-Flag for ISDN-channel
1960  */
1961 void
isdn_unexclusive_channel(int di,int ch)1962 isdn_unexclusive_channel(int di, int ch)
1963 {
1964 	int i;
1965 
1966 	for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1967 		if ((dev->drvmap[i] == di) &&
1968 		    (dev->chanmap[i] == ch)) {
1969 			dev->usage[i] &= ~ISDN_USAGE_EXCLUSIVE;
1970 			isdn_info_update();
1971 			return;
1972 		}
1973 }
1974 
1975 /*
1976  *  writebuf replacement for SKB_ABLE drivers
1977  */
1978 static int
isdn_writebuf_stub(int drvidx,int chan,const u_char __user * buf,int len)1979 isdn_writebuf_stub(int drvidx, int chan, const u_char __user *buf, int len)
1980 {
1981 	int ret;
1982 	int hl = dev->drv[drvidx]->interface->hl_hdrlen;
1983 	struct sk_buff *skb = alloc_skb(hl + len, GFP_ATOMIC);
1984 
1985 	if (!skb)
1986 		return -ENOMEM;
1987 	skb_reserve(skb, hl);
1988 	if (copy_from_user(skb_put(skb, len), buf, len)) {
1989 		dev_kfree_skb(skb);
1990 		return -EFAULT;
1991 	}
1992 	ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
1993 	if (ret <= 0)
1994 		dev_kfree_skb(skb);
1995 	if (ret > 0)
1996 		dev->obytes[isdn_dc2minor(drvidx, chan)] += ret;
1997 	return ret;
1998 }
1999 
2000 /*
2001  * Return: length of data on success, -ERRcode on failure.
2002  */
2003 int
isdn_writebuf_skb_stub(int drvidx,int chan,int ack,struct sk_buff * skb)2004 isdn_writebuf_skb_stub(int drvidx, int chan, int ack, struct sk_buff *skb)
2005 {
2006 	int ret;
2007 	struct sk_buff *nskb = NULL;
2008 	int v110_ret = skb->len;
2009 	int idx = isdn_dc2minor(drvidx, chan);
2010 
2011 	if (dev->v110[idx]) {
2012 		atomic_inc(&dev->v110use[idx]);
2013 		nskb = isdn_v110_encode(dev->v110[idx], skb);
2014 		atomic_dec(&dev->v110use[idx]);
2015 		if (!nskb)
2016 			return 0;
2017 		v110_ret = *((int *)nskb->data);
2018 		skb_pull(nskb, sizeof(int));
2019 		if (!nskb->len) {
2020 			dev_kfree_skb(nskb);
2021 			return v110_ret;
2022 		}
2023 		/* V.110 must always be acknowledged */
2024 		ack = 1;
2025 		ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, nskb);
2026 	} else {
2027 		int hl = dev->drv[drvidx]->interface->hl_hdrlen;
2028 
2029 		if (skb_headroom(skb) < hl) {
2030 			/*
2031 			 * This should only occur when new HL driver with
2032 			 * increased hl_hdrlen was loaded after netdevice
2033 			 * was created and connected to the new driver.
2034 			 *
2035 			 * The V.110 branch (re-allocates on its own) does
2036 			 * not need this
2037 			 */
2038 			struct sk_buff *skb_tmp;
2039 
2040 			skb_tmp = skb_realloc_headroom(skb, hl);
2041 			printk(KERN_DEBUG "isdn_writebuf_skb_stub: reallocating headroom%s\n", skb_tmp ? "" : " failed");
2042 			if (!skb_tmp) return -ENOMEM; /* 0 better? */
2043 			ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb_tmp);
2044 			if (ret > 0) {
2045 				dev_kfree_skb(skb);
2046 			} else {
2047 				dev_kfree_skb(skb_tmp);
2048 			}
2049 		} else {
2050 			ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb);
2051 		}
2052 	}
2053 	if (ret > 0) {
2054 		dev->obytes[idx] += ret;
2055 		if (dev->v110[idx]) {
2056 			atomic_inc(&dev->v110use[idx]);
2057 			dev->v110[idx]->skbuser++;
2058 			atomic_dec(&dev->v110use[idx]);
2059 			/* For V.110 return unencoded data length */
2060 			ret = v110_ret;
2061 			/* if the complete frame was send we free the skb;
2062 			   if not upper function will requeue the skb */
2063 			if (ret == skb->len)
2064 				dev_kfree_skb(skb);
2065 		}
2066 	} else
2067 		if (dev->v110[idx])
2068 			dev_kfree_skb(nskb);
2069 	return ret;
2070 }
2071 
2072 static int
isdn_add_channels(isdn_driver_t * d,int drvidx,int n,int adding)2073 isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding)
2074 {
2075 	int j, k, m;
2076 
2077 	init_waitqueue_head(&d->st_waitq);
2078 	if (d->flags & DRV_FLAG_RUNNING)
2079 		return -1;
2080 	if (n < 1) return 0;
2081 
2082 	m = (adding) ? d->channels + n : n;
2083 
2084 	if (dev->channels + n > ISDN_MAX_CHANNELS) {
2085 		printk(KERN_WARNING "register_isdn: Max. %d channels supported\n",
2086 		       ISDN_MAX_CHANNELS);
2087 		return -1;
2088 	}
2089 
2090 	if ((adding) && (d->rcverr))
2091 		kfree(d->rcverr);
2092 	if (!(d->rcverr = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
2093 		printk(KERN_WARNING "register_isdn: Could not alloc rcverr\n");
2094 		return -1;
2095 	}
2096 
2097 	if ((adding) && (d->rcvcount))
2098 		kfree(d->rcvcount);
2099 	if (!(d->rcvcount = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
2100 		printk(KERN_WARNING "register_isdn: Could not alloc rcvcount\n");
2101 		if (!adding)
2102 			kfree(d->rcverr);
2103 		return -1;
2104 	}
2105 
2106 	if ((adding) && (d->rpqueue)) {
2107 		for (j = 0; j < d->channels; j++)
2108 			skb_queue_purge(&d->rpqueue[j]);
2109 		kfree(d->rpqueue);
2110 	}
2111 	if (!(d->rpqueue = kmalloc(sizeof(struct sk_buff_head) * m, GFP_ATOMIC))) {
2112 		printk(KERN_WARNING "register_isdn: Could not alloc rpqueue\n");
2113 		if (!adding) {
2114 			kfree(d->rcvcount);
2115 			kfree(d->rcverr);
2116 		}
2117 		return -1;
2118 	}
2119 	for (j = 0; j < m; j++) {
2120 		skb_queue_head_init(&d->rpqueue[j]);
2121 	}
2122 
2123 	if ((adding) && (d->rcv_waitq))
2124 		kfree(d->rcv_waitq);
2125 	d->rcv_waitq = kmalloc(sizeof(wait_queue_head_t) * 2 * m, GFP_ATOMIC);
2126 	if (!d->rcv_waitq) {
2127 		printk(KERN_WARNING "register_isdn: Could not alloc rcv_waitq\n");
2128 		if (!adding) {
2129 			kfree(d->rpqueue);
2130 			kfree(d->rcvcount);
2131 			kfree(d->rcverr);
2132 		}
2133 		return -1;
2134 	}
2135 	d->snd_waitq = d->rcv_waitq + m;
2136 	for (j = 0; j < m; j++) {
2137 		init_waitqueue_head(&d->rcv_waitq[j]);
2138 		init_waitqueue_head(&d->snd_waitq[j]);
2139 	}
2140 
2141 	dev->channels += n;
2142 	for (j = d->channels; j < m; j++)
2143 		for (k = 0; k < ISDN_MAX_CHANNELS; k++)
2144 			if (dev->chanmap[k] < 0) {
2145 				dev->chanmap[k] = j;
2146 				dev->drvmap[k] = drvidx;
2147 				break;
2148 			}
2149 	d->channels = m;
2150 	return 0;
2151 }
2152 
2153 /*
2154  * Low-level-driver registration
2155  */
2156 
2157 static void
set_global_features(void)2158 set_global_features(void)
2159 {
2160 	int drvidx;
2161 
2162 	dev->global_features = 0;
2163 	for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++) {
2164 		if (!dev->drv[drvidx])
2165 			continue;
2166 		if (dev->drv[drvidx]->interface)
2167 			dev->global_features |= dev->drv[drvidx]->interface->features;
2168 	}
2169 }
2170 
2171 #ifdef CONFIG_ISDN_DIVERSION
2172 
map_drvname(int di)2173 static char *map_drvname(int di)
2174 {
2175 	if ((di < 0) || (di >= ISDN_MAX_DRIVERS))
2176 		return (NULL);
2177 	return (dev->drvid[di]); /* driver name */
2178 } /* map_drvname */
2179 
map_namedrv(char * id)2180 static int map_namedrv(char *id)
2181 {  int i;
2182 
2183 	for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2184 	{ if (!strcmp(dev->drvid[i], id))
2185 			return (i);
2186 	}
2187 	return (-1);
2188 } /* map_namedrv */
2189 
DIVERT_REG_NAME(isdn_divert_if * i_div)2190 int DIVERT_REG_NAME(isdn_divert_if *i_div)
2191 {
2192 	if (i_div->if_magic != DIVERT_IF_MAGIC)
2193 		return (DIVERT_VER_ERR);
2194 	switch (i_div->cmd)
2195 	{
2196 	case DIVERT_CMD_REL:
2197 		if (divert_if != i_div)
2198 			return (DIVERT_REL_ERR);
2199 		divert_if = NULL; /* free interface */
2200 		return (DIVERT_NO_ERR);
2201 
2202 	case DIVERT_CMD_REG:
2203 		if (divert_if)
2204 			return (DIVERT_REG_ERR);
2205 		i_div->ll_cmd = isdn_command; /* set command function */
2206 		i_div->drv_to_name = map_drvname;
2207 		i_div->name_to_drv = map_namedrv;
2208 		divert_if = i_div; /* remember interface */
2209 		return (DIVERT_NO_ERR);
2210 
2211 	default:
2212 		return (DIVERT_CMD_ERR);
2213 	}
2214 } /* DIVERT_REG_NAME */
2215 
2216 EXPORT_SYMBOL(DIVERT_REG_NAME);
2217 
2218 #endif /* CONFIG_ISDN_DIVERSION */
2219 
2220 
2221 EXPORT_SYMBOL(register_isdn);
2222 #ifdef CONFIG_ISDN_PPP
2223 EXPORT_SYMBOL(isdn_ppp_register_compressor);
2224 EXPORT_SYMBOL(isdn_ppp_unregister_compressor);
2225 #endif
2226 
2227 int
register_isdn(isdn_if * i)2228 register_isdn(isdn_if *i)
2229 {
2230 	isdn_driver_t *d;
2231 	int j;
2232 	ulong flags;
2233 	int drvidx;
2234 
2235 	if (dev->drivers >= ISDN_MAX_DRIVERS) {
2236 		printk(KERN_WARNING "register_isdn: Max. %d drivers supported\n",
2237 		       ISDN_MAX_DRIVERS);
2238 		return 0;
2239 	}
2240 	if (!i->writebuf_skb) {
2241 		printk(KERN_WARNING "register_isdn: No write routine given.\n");
2242 		return 0;
2243 	}
2244 	if (!(d = kzalloc(sizeof(isdn_driver_t), GFP_KERNEL))) {
2245 		printk(KERN_WARNING "register_isdn: Could not alloc driver-struct\n");
2246 		return 0;
2247 	}
2248 
2249 	d->maxbufsize = i->maxbufsize;
2250 	d->pktcount = 0;
2251 	d->stavail = 0;
2252 	d->flags = DRV_FLAG_LOADED;
2253 	d->online = 0;
2254 	d->interface = i;
2255 	d->channels = 0;
2256 	spin_lock_irqsave(&dev->lock, flags);
2257 	for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
2258 		if (!dev->drv[drvidx])
2259 			break;
2260 	if (isdn_add_channels(d, drvidx, i->channels, 0)) {
2261 		spin_unlock_irqrestore(&dev->lock, flags);
2262 		kfree(d);
2263 		return 0;
2264 	}
2265 	i->channels = drvidx;
2266 	i->rcvcallb_skb = isdn_receive_skb_callback;
2267 	i->statcallb = isdn_status_callback;
2268 	if (!strlen(i->id))
2269 		sprintf(i->id, "line%d", drvidx);
2270 	for (j = 0; j < drvidx; j++)
2271 		if (!strcmp(i->id, dev->drvid[j]))
2272 			sprintf(i->id, "line%d", drvidx);
2273 	dev->drv[drvidx] = d;
2274 	strcpy(dev->drvid[drvidx], i->id);
2275 	isdn_info_update();
2276 	dev->drivers++;
2277 	set_global_features();
2278 	spin_unlock_irqrestore(&dev->lock, flags);
2279 	return 1;
2280 }
2281 
2282 /*
2283 *****************************************************************************
2284 * And now the modules code.
2285 *****************************************************************************
2286 */
2287 
2288 static char *
isdn_getrev(const char * revision)2289 isdn_getrev(const char *revision)
2290 {
2291 	char *rev;
2292 	char *p;
2293 
2294 	if ((p = strchr(revision, ':'))) {
2295 		rev = p + 2;
2296 		p = strchr(rev, '$');
2297 		*--p = 0;
2298 	} else
2299 		rev = "???";
2300 	return rev;
2301 }
2302 
2303 /*
2304  * Allocate and initialize all data, register modem-devices
2305  */
isdn_init(void)2306 static int __init isdn_init(void)
2307 {
2308 	int i;
2309 	char tmprev[50];
2310 
2311 	dev = vzalloc(sizeof(isdn_dev));
2312 	if (!dev) {
2313 		printk(KERN_WARNING "isdn: Could not allocate device-struct.\n");
2314 		return -EIO;
2315 	}
2316 	init_timer(&dev->timer);
2317 	dev->timer.function = isdn_timer_funct;
2318 	spin_lock_init(&dev->lock);
2319 	spin_lock_init(&dev->timerlock);
2320 #ifdef MODULE
2321 	dev->owner = THIS_MODULE;
2322 #endif
2323 	mutex_init(&dev->mtx);
2324 	init_waitqueue_head(&dev->info_waitq);
2325 	for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
2326 		dev->drvmap[i] = -1;
2327 		dev->chanmap[i] = -1;
2328 		dev->m_idx[i] = -1;
2329 		strcpy(dev->num[i], "???");
2330 		init_waitqueue_head(&dev->mdm.info[i].open_wait);
2331 		init_waitqueue_head(&dev->mdm.info[i].close_wait);
2332 	}
2333 	if (register_chrdev(ISDN_MAJOR, "isdn", &isdn_fops)) {
2334 		printk(KERN_WARNING "isdn: Could not register control devices\n");
2335 		vfree(dev);
2336 		return -EIO;
2337 	}
2338 	if ((isdn_tty_modem_init()) < 0) {
2339 		printk(KERN_WARNING "isdn: Could not register tty devices\n");
2340 		vfree(dev);
2341 		unregister_chrdev(ISDN_MAJOR, "isdn");
2342 		return -EIO;
2343 	}
2344 #ifdef CONFIG_ISDN_PPP
2345 	if (isdn_ppp_init() < 0) {
2346 		printk(KERN_WARNING "isdn: Could not create PPP-device-structs\n");
2347 		isdn_tty_exit();
2348 		unregister_chrdev(ISDN_MAJOR, "isdn");
2349 		vfree(dev);
2350 		return -EIO;
2351 	}
2352 #endif                          /* CONFIG_ISDN_PPP */
2353 
2354 	strcpy(tmprev, isdn_revision);
2355 	printk(KERN_NOTICE "ISDN subsystem Rev: %s/", isdn_getrev(tmprev));
2356 	strcpy(tmprev, isdn_tty_revision);
2357 	printk("%s/", isdn_getrev(tmprev));
2358 	strcpy(tmprev, isdn_net_revision);
2359 	printk("%s/", isdn_getrev(tmprev));
2360 	strcpy(tmprev, isdn_ppp_revision);
2361 	printk("%s/", isdn_getrev(tmprev));
2362 	strcpy(tmprev, isdn_audio_revision);
2363 	printk("%s/", isdn_getrev(tmprev));
2364 	strcpy(tmprev, isdn_v110_revision);
2365 	printk("%s", isdn_getrev(tmprev));
2366 
2367 #ifdef MODULE
2368 	printk(" loaded\n");
2369 #else
2370 	printk("\n");
2371 #endif
2372 	isdn_info_update();
2373 	return 0;
2374 }
2375 
2376 /*
2377  * Unload module
2378  */
isdn_exit(void)2379 static void __exit isdn_exit(void)
2380 {
2381 #ifdef CONFIG_ISDN_PPP
2382 	isdn_ppp_cleanup();
2383 #endif
2384 	if (isdn_net_rmall() < 0) {
2385 		printk(KERN_WARNING "isdn: net-device busy, remove cancelled\n");
2386 		return;
2387 	}
2388 	isdn_tty_exit();
2389 	unregister_chrdev(ISDN_MAJOR, "isdn");
2390 	del_timer(&dev->timer);
2391 	/* call vfree with interrupts enabled, else it will hang */
2392 	vfree(dev);
2393 	printk(KERN_NOTICE "ISDN-subsystem unloaded\n");
2394 }
2395 
2396 module_init(isdn_init);
2397 module_exit(isdn_exit);
2398