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 #ifdef CONFIG_ISDN_PPP
50 extern char *isdn_ppp_revision;
51 #else
52 static char *isdn_ppp_revision = ": none $";
53 #endif
54 #ifdef CONFIG_ISDN_AUDIO
55 extern char *isdn_audio_revision;
56 #else
57 static char *isdn_audio_revision = ": none $";
58 #endif
59 extern char *isdn_v110_revision;
60
61 #ifdef CONFIG_ISDN_DIVERSION
62 static isdn_divert_if *divert_if; /* = NULL */
63 #endif /* CONFIG_ISDN_DIVERSION */
64
65
66 static int isdn_writebuf_stub(int, int, const u_char __user *, int);
67 static void set_global_features(void);
68 static int isdn_wildmat(char *s, char *p);
69 static int isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding);
70
71 static inline void
isdn_lock_driver(isdn_driver_t * drv)72 isdn_lock_driver(isdn_driver_t *drv)
73 {
74 try_module_get(drv->interface->owner);
75 drv->locks++;
76 }
77
78 void
isdn_lock_drivers(void)79 isdn_lock_drivers(void)
80 {
81 int i;
82
83 for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
84 if (!dev->drv[i])
85 continue;
86 isdn_lock_driver(dev->drv[i]);
87 }
88 }
89
90 static inline void
isdn_unlock_driver(isdn_driver_t * drv)91 isdn_unlock_driver(isdn_driver_t *drv)
92 {
93 if (drv->locks > 0) {
94 drv->locks--;
95 module_put(drv->interface->owner);
96 }
97 }
98
99 void
isdn_unlock_drivers(void)100 isdn_unlock_drivers(void)
101 {
102 int i;
103
104 for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
105 if (!dev->drv[i])
106 continue;
107 isdn_unlock_driver(dev->drv[i]);
108 }
109 }
110
111 #if defined(ISDN_DEBUG_NET_DUMP) || defined(ISDN_DEBUG_MODEM_DUMP)
112 void
isdn_dumppkt(char * s,u_char * p,int len,int dumplen)113 isdn_dumppkt(char *s, u_char *p, int len, int dumplen)
114 {
115 int dumpc;
116
117 printk(KERN_DEBUG "%s(%d) ", s, len);
118 for (dumpc = 0; (dumpc < dumplen) && (len); len--, dumpc++)
119 printk(" %02x", *p++);
120 printk("\n");
121 }
122 #endif
123
124 /*
125 * I picked the pattern-matching-functions from an old GNU-tar version (1.10)
126 * It was originally written and put to PD by rs@mirror.TMC.COM (Rich Salz)
127 */
128 static int
isdn_star(char * s,char * p)129 isdn_star(char *s, char *p)
130 {
131 while (isdn_wildmat(s, p)) {
132 if (*++s == '\0')
133 return (2);
134 }
135 return (0);
136 }
137
138 /*
139 * Shell-type Pattern-matching for incoming caller-Ids
140 * This function gets a string in s and checks, if it matches the pattern
141 * given in p.
142 *
143 * Return:
144 * 0 = match.
145 * 1 = no match.
146 * 2 = no match. Would eventually match, if s would be longer.
147 *
148 * Possible Patterns:
149 *
150 * '?' matches one character
151 * '*' matches zero or more characters
152 * [xyz] matches the set of characters in brackets.
153 * [^xyz] matches any single character not in the set of characters
154 */
155
156 static int
isdn_wildmat(char * s,char * p)157 isdn_wildmat(char *s, char *p)
158 {
159 register int last;
160 register int matched;
161 register int reverse;
162 register int nostar = 1;
163
164 if (!(*s) && !(*p))
165 return (1);
166 for (; *p; s++, p++)
167 switch (*p) {
168 case '\\':
169 /*
170 * Literal match with following character,
171 * fall through.
172 */
173 p++;
174 default:
175 if (*s != *p)
176 return (*s == '\0') ? 2 : 1;
177 continue;
178 case '?':
179 /* Match anything. */
180 if (*s == '\0')
181 return (2);
182 continue;
183 case '*':
184 nostar = 0;
185 /* Trailing star matches everything. */
186 return (*++p ? isdn_star(s, p) : 0);
187 case '[':
188 /* [^....] means inverse character class. */
189 if ((reverse = (p[1] == '^')))
190 p++;
191 for (last = 0, matched = 0; *++p && (*p != ']'); last = *p)
192 /* This next line requires a good C compiler. */
193 if (*p == '-' ? *s <= *++p && *s >= last : *s == *p)
194 matched = 1;
195 if (matched == reverse)
196 return (1);
197 continue;
198 }
199 return (*s == '\0') ? 0 : nostar;
200 }
201
isdn_msncmp(const char * msn1,const char * msn2)202 int isdn_msncmp(const char *msn1, const char *msn2)
203 {
204 char TmpMsn1[ISDN_MSNLEN];
205 char TmpMsn2[ISDN_MSNLEN];
206 char *p;
207
208 for (p = TmpMsn1; *msn1 && *msn1 != ':';) // Strip off a SPID
209 *p++ = *msn1++;
210 *p = '\0';
211
212 for (p = TmpMsn2; *msn2 && *msn2 != ':';) // Strip off a SPID
213 *p++ = *msn2++;
214 *p = '\0';
215
216 return isdn_wildmat(TmpMsn1, TmpMsn2);
217 }
218
219 int
isdn_dc2minor(int di,int ch)220 isdn_dc2minor(int di, int ch)
221 {
222 int i;
223 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
224 if (dev->chanmap[i] == ch && dev->drvmap[i] == di)
225 return i;
226 return -1;
227 }
228
229 static int isdn_timer_cnt1 = 0;
230 static int isdn_timer_cnt2 = 0;
231 static int isdn_timer_cnt3 = 0;
232
233 static void
isdn_timer_funct(struct timer_list * unused)234 isdn_timer_funct(struct timer_list *unused)
235 {
236 int tf = dev->tflags;
237 if (tf & ISDN_TIMER_FAST) {
238 if (tf & ISDN_TIMER_MODEMREAD)
239 isdn_tty_readmodem();
240 if (tf & ISDN_TIMER_MODEMPLUS)
241 isdn_tty_modem_escape();
242 if (tf & ISDN_TIMER_MODEMXMIT)
243 isdn_tty_modem_xmit();
244 }
245 if (tf & ISDN_TIMER_SLOW) {
246 if (++isdn_timer_cnt1 >= ISDN_TIMER_02SEC) {
247 isdn_timer_cnt1 = 0;
248 if (tf & ISDN_TIMER_NETDIAL)
249 isdn_net_dial();
250 }
251 if (++isdn_timer_cnt2 >= ISDN_TIMER_1SEC) {
252 isdn_timer_cnt2 = 0;
253 if (tf & ISDN_TIMER_NETHANGUP)
254 isdn_net_autohup();
255 if (++isdn_timer_cnt3 >= ISDN_TIMER_RINGING) {
256 isdn_timer_cnt3 = 0;
257 if (tf & ISDN_TIMER_MODEMRING)
258 isdn_tty_modem_ring();
259 }
260 if (tf & ISDN_TIMER_CARRIER)
261 isdn_tty_carrier_timeout();
262 }
263 }
264 if (tf)
265 mod_timer(&dev->timer, jiffies + ISDN_TIMER_RES);
266 }
267
268 void
isdn_timer_ctrl(int tf,int onoff)269 isdn_timer_ctrl(int tf, int onoff)
270 {
271 unsigned long flags;
272 int old_tflags;
273
274 spin_lock_irqsave(&dev->timerlock, flags);
275 if ((tf & ISDN_TIMER_SLOW) && (!(dev->tflags & ISDN_TIMER_SLOW))) {
276 /* If the slow-timer wasn't activated until now */
277 isdn_timer_cnt1 = 0;
278 isdn_timer_cnt2 = 0;
279 }
280 old_tflags = dev->tflags;
281 if (onoff)
282 dev->tflags |= tf;
283 else
284 dev->tflags &= ~tf;
285 if (dev->tflags && !old_tflags)
286 mod_timer(&dev->timer, jiffies + ISDN_TIMER_RES);
287 spin_unlock_irqrestore(&dev->timerlock, flags);
288 }
289
290 /*
291 * Receive a packet from B-Channel. (Called from low-level-module)
292 */
293 static void
isdn_receive_skb_callback(int di,int channel,struct sk_buff * skb)294 isdn_receive_skb_callback(int di, int channel, struct sk_buff *skb)
295 {
296 int i;
297
298 if ((i = isdn_dc2minor(di, channel)) == -1) {
299 dev_kfree_skb(skb);
300 return;
301 }
302 /* Update statistics */
303 dev->ibytes[i] += skb->len;
304
305 /* First, try to deliver data to network-device */
306 if (isdn_net_rcv_skb(i, skb))
307 return;
308
309 /* V.110 handling
310 * makes sense for async streams only, so it is
311 * called after possible net-device delivery.
312 */
313 if (dev->v110[i]) {
314 atomic_inc(&dev->v110use[i]);
315 skb = isdn_v110_decode(dev->v110[i], skb);
316 atomic_dec(&dev->v110use[i]);
317 if (!skb)
318 return;
319 }
320
321 /* No network-device found, deliver to tty or raw-channel */
322 if (skb->len) {
323 if (isdn_tty_rcv_skb(i, di, channel, skb))
324 return;
325 wake_up_interruptible(&dev->drv[di]->rcv_waitq[channel]);
326 } else
327 dev_kfree_skb(skb);
328 }
329
330 /*
331 * Intercept command from Linklevel to Lowlevel.
332 * If layer 2 protocol is V.110 and this is not supported by current
333 * lowlevel-driver, use driver's transparent mode and handle V.110 in
334 * linklevel instead.
335 */
336 int
isdn_command(isdn_ctrl * cmd)337 isdn_command(isdn_ctrl *cmd)
338 {
339 if (cmd->driver == -1) {
340 printk(KERN_WARNING "isdn_command command(%x) driver -1\n", cmd->command);
341 return (1);
342 }
343 if (!dev->drv[cmd->driver]) {
344 printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d] NULL\n",
345 cmd->command, cmd->driver);
346 return (1);
347 }
348 if (!dev->drv[cmd->driver]->interface) {
349 printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d]->interface NULL\n",
350 cmd->command, cmd->driver);
351 return (1);
352 }
353 if (cmd->command == ISDN_CMD_SETL2) {
354 int idx = isdn_dc2minor(cmd->driver, cmd->arg & 255);
355 unsigned long l2prot = (cmd->arg >> 8) & 255;
356 unsigned long features = (dev->drv[cmd->driver]->interface->features
357 >> ISDN_FEATURE_L2_SHIFT) &
358 ISDN_FEATURE_L2_MASK;
359 unsigned long l2_feature = (1 << l2prot);
360
361 switch (l2prot) {
362 case ISDN_PROTO_L2_V11096:
363 case ISDN_PROTO_L2_V11019:
364 case ISDN_PROTO_L2_V11038:
365 /* If V.110 requested, but not supported by
366 * HL-driver, set emulator-flag and change
367 * Layer-2 to transparent
368 */
369 if (!(features & l2_feature)) {
370 dev->v110emu[idx] = l2prot;
371 cmd->arg = (cmd->arg & 255) |
372 (ISDN_PROTO_L2_TRANS << 8);
373 } else
374 dev->v110emu[idx] = 0;
375 }
376 }
377 return dev->drv[cmd->driver]->interface->command(cmd);
378 }
379
380 void
isdn_all_eaz(int di,int ch)381 isdn_all_eaz(int di, int ch)
382 {
383 isdn_ctrl cmd;
384
385 if (di < 0)
386 return;
387 cmd.driver = di;
388 cmd.arg = ch;
389 cmd.command = ISDN_CMD_SETEAZ;
390 cmd.parm.num[0] = '\0';
391 isdn_command(&cmd);
392 }
393
394 /*
395 * Begin of a CAPI like LL<->HL interface, currently used only for
396 * supplementary service (CAPI 2.0 part III)
397 */
398 #include <linux/isdn/capicmd.h>
399
400 static int
isdn_capi_rec_hl_msg(capi_msg * cm)401 isdn_capi_rec_hl_msg(capi_msg *cm)
402 {
403 switch (cm->Command) {
404 case CAPI_FACILITY:
405 /* in the moment only handled in tty */
406 return (isdn_tty_capi_facility(cm));
407 default:
408 return (-1);
409 }
410 }
411
412 static int
isdn_status_callback(isdn_ctrl * c)413 isdn_status_callback(isdn_ctrl *c)
414 {
415 int di;
416 u_long flags;
417 int i;
418 int r;
419 int retval = 0;
420 isdn_ctrl cmd;
421 isdn_net_dev *p;
422
423 di = c->driver;
424 i = isdn_dc2minor(di, c->arg);
425 switch (c->command) {
426 case ISDN_STAT_BSENT:
427 if (i < 0)
428 return -1;
429 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
430 return 0;
431 if (isdn_net_stat_callback(i, c))
432 return 0;
433 if (isdn_v110_stat_callback(i, c))
434 return 0;
435 if (isdn_tty_stat_callback(i, c))
436 return 0;
437 wake_up_interruptible(&dev->drv[di]->snd_waitq[c->arg]);
438 break;
439 case ISDN_STAT_STAVAIL:
440 dev->drv[di]->stavail += c->arg;
441 wake_up_interruptible(&dev->drv[di]->st_waitq);
442 break;
443 case ISDN_STAT_RUN:
444 dev->drv[di]->flags |= DRV_FLAG_RUNNING;
445 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
446 if (dev->drvmap[i] == di)
447 isdn_all_eaz(di, dev->chanmap[i]);
448 set_global_features();
449 break;
450 case ISDN_STAT_STOP:
451 dev->drv[di]->flags &= ~DRV_FLAG_RUNNING;
452 break;
453 case ISDN_STAT_ICALL:
454 if (i < 0)
455 return -1;
456 #ifdef ISDN_DEBUG_STATCALLB
457 printk(KERN_DEBUG "ICALL (net): %d %ld %s\n", di, c->arg, c->parm.num);
458 #endif
459 if (dev->global_flags & ISDN_GLOBAL_STOPPED) {
460 cmd.driver = di;
461 cmd.arg = c->arg;
462 cmd.command = ISDN_CMD_HANGUP;
463 isdn_command(&cmd);
464 return 0;
465 }
466 /* Try to find a network-interface which will accept incoming call */
467 r = ((c->command == ISDN_STAT_ICALLW) ? 0 : isdn_net_find_icall(di, c->arg, i, &c->parm.setup));
468 switch (r) {
469 case 0:
470 /* No network-device replies.
471 * Try ttyI's.
472 * These return 0 on no match, 1 on match and
473 * 3 on eventually match, if CID is longer.
474 */
475 if (c->command == ISDN_STAT_ICALL)
476 if ((retval = isdn_tty_find_icall(di, c->arg, &c->parm.setup))) return (retval);
477 #ifdef CONFIG_ISDN_DIVERSION
478 if (divert_if)
479 if ((retval = divert_if->stat_callback(c)))
480 return (retval); /* processed */
481 #endif /* CONFIG_ISDN_DIVERSION */
482 if ((!retval) && (dev->drv[di]->flags & DRV_FLAG_REJBUS)) {
483 /* No tty responding */
484 cmd.driver = di;
485 cmd.arg = c->arg;
486 cmd.command = ISDN_CMD_HANGUP;
487 isdn_command(&cmd);
488 retval = 2;
489 }
490 break;
491 case 1:
492 /* Schedule connection-setup */
493 isdn_net_dial();
494 cmd.driver = di;
495 cmd.arg = c->arg;
496 cmd.command = ISDN_CMD_ACCEPTD;
497 for (p = dev->netdev; p; p = p->next)
498 if (p->local->isdn_channel == cmd.arg)
499 {
500 strcpy(cmd.parm.setup.eazmsn, p->local->msn);
501 isdn_command(&cmd);
502 retval = 1;
503 break;
504 }
505 break;
506
507 case 2: /* For calling back, first reject incoming call ... */
508 case 3: /* Interface found, but down, reject call actively */
509 retval = 2;
510 printk(KERN_INFO "isdn: Rejecting Call\n");
511 cmd.driver = di;
512 cmd.arg = c->arg;
513 cmd.command = ISDN_CMD_HANGUP;
514 isdn_command(&cmd);
515 if (r == 3)
516 break;
517 /* Fall through */
518 case 4:
519 /* ... then start callback. */
520 isdn_net_dial();
521 break;
522 case 5:
523 /* Number would eventually match, if longer */
524 retval = 3;
525 break;
526 }
527 #ifdef ISDN_DEBUG_STATCALLB
528 printk(KERN_DEBUG "ICALL: ret=%d\n", retval);
529 #endif
530 return retval;
531 break;
532 case ISDN_STAT_CINF:
533 if (i < 0)
534 return -1;
535 #ifdef ISDN_DEBUG_STATCALLB
536 printk(KERN_DEBUG "CINF: %ld %s\n", c->arg, c->parm.num);
537 #endif
538 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
539 return 0;
540 if (strcmp(c->parm.num, "0"))
541 isdn_net_stat_callback(i, c);
542 isdn_tty_stat_callback(i, c);
543 break;
544 case ISDN_STAT_CAUSE:
545 #ifdef ISDN_DEBUG_STATCALLB
546 printk(KERN_DEBUG "CAUSE: %ld %s\n", c->arg, c->parm.num);
547 #endif
548 printk(KERN_INFO "isdn: %s,ch%ld cause: %s\n",
549 dev->drvid[di], c->arg, c->parm.num);
550 isdn_tty_stat_callback(i, c);
551 #ifdef CONFIG_ISDN_DIVERSION
552 if (divert_if)
553 divert_if->stat_callback(c);
554 #endif /* CONFIG_ISDN_DIVERSION */
555 break;
556 case ISDN_STAT_DISPLAY:
557 #ifdef ISDN_DEBUG_STATCALLB
558 printk(KERN_DEBUG "DISPLAY: %ld %s\n", c->arg, c->parm.display);
559 #endif
560 isdn_tty_stat_callback(i, c);
561 #ifdef CONFIG_ISDN_DIVERSION
562 if (divert_if)
563 divert_if->stat_callback(c);
564 #endif /* CONFIG_ISDN_DIVERSION */
565 break;
566 case ISDN_STAT_DCONN:
567 if (i < 0)
568 return -1;
569 #ifdef ISDN_DEBUG_STATCALLB
570 printk(KERN_DEBUG "DCONN: %ld\n", c->arg);
571 #endif
572 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
573 return 0;
574 /* Find any net-device, waiting for D-channel setup */
575 if (isdn_net_stat_callback(i, c))
576 break;
577 isdn_v110_stat_callback(i, c);
578 /* Find any ttyI, waiting for D-channel setup */
579 if (isdn_tty_stat_callback(i, c)) {
580 cmd.driver = di;
581 cmd.arg = c->arg;
582 cmd.command = ISDN_CMD_ACCEPTB;
583 isdn_command(&cmd);
584 break;
585 }
586 break;
587 case ISDN_STAT_DHUP:
588 if (i < 0)
589 return -1;
590 #ifdef ISDN_DEBUG_STATCALLB
591 printk(KERN_DEBUG "DHUP: %ld\n", c->arg);
592 #endif
593 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
594 return 0;
595 dev->drv[di]->online &= ~(1 << (c->arg));
596 isdn_info_update();
597 /* Signal hangup to network-devices */
598 if (isdn_net_stat_callback(i, c))
599 break;
600 isdn_v110_stat_callback(i, c);
601 if (isdn_tty_stat_callback(i, c))
602 break;
603 #ifdef CONFIG_ISDN_DIVERSION
604 if (divert_if)
605 divert_if->stat_callback(c);
606 #endif /* CONFIG_ISDN_DIVERSION */
607 break;
608 break;
609 case ISDN_STAT_BCONN:
610 if (i < 0)
611 return -1;
612 #ifdef ISDN_DEBUG_STATCALLB
613 printk(KERN_DEBUG "BCONN: %ld\n", c->arg);
614 #endif
615 /* Signal B-channel-connect to network-devices */
616 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
617 return 0;
618 dev->drv[di]->online |= (1 << (c->arg));
619 isdn_info_update();
620 if (isdn_net_stat_callback(i, c))
621 break;
622 isdn_v110_stat_callback(i, c);
623 if (isdn_tty_stat_callback(i, c))
624 break;
625 break;
626 case ISDN_STAT_BHUP:
627 if (i < 0)
628 return -1;
629 #ifdef ISDN_DEBUG_STATCALLB
630 printk(KERN_DEBUG "BHUP: %ld\n", c->arg);
631 #endif
632 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
633 return 0;
634 dev->drv[di]->online &= ~(1 << (c->arg));
635 isdn_info_update();
636 #ifdef CONFIG_ISDN_X25
637 /* Signal hangup to network-devices */
638 if (isdn_net_stat_callback(i, c))
639 break;
640 #endif
641 isdn_v110_stat_callback(i, c);
642 if (isdn_tty_stat_callback(i, c))
643 break;
644 break;
645 case ISDN_STAT_NODCH:
646 if (i < 0)
647 return -1;
648 #ifdef ISDN_DEBUG_STATCALLB
649 printk(KERN_DEBUG "NODCH: %ld\n", c->arg);
650 #endif
651 if (dev->global_flags & ISDN_GLOBAL_STOPPED)
652 return 0;
653 if (isdn_net_stat_callback(i, c))
654 break;
655 if (isdn_tty_stat_callback(i, c))
656 break;
657 break;
658 case ISDN_STAT_ADDCH:
659 spin_lock_irqsave(&dev->lock, flags);
660 if (isdn_add_channels(dev->drv[di], di, c->arg, 1)) {
661 spin_unlock_irqrestore(&dev->lock, flags);
662 return -1;
663 }
664 spin_unlock_irqrestore(&dev->lock, flags);
665 isdn_info_update();
666 break;
667 case ISDN_STAT_DISCH:
668 spin_lock_irqsave(&dev->lock, flags);
669 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
670 if ((dev->drvmap[i] == di) &&
671 (dev->chanmap[i] == c->arg)) {
672 if (c->parm.num[0])
673 dev->usage[i] &= ~ISDN_USAGE_DISABLED;
674 else
675 if (USG_NONE(dev->usage[i])) {
676 dev->usage[i] |= ISDN_USAGE_DISABLED;
677 }
678 else
679 retval = -1;
680 break;
681 }
682 spin_unlock_irqrestore(&dev->lock, flags);
683 isdn_info_update();
684 break;
685 case ISDN_STAT_UNLOAD:
686 while (dev->drv[di]->locks > 0) {
687 isdn_unlock_driver(dev->drv[di]);
688 }
689 spin_lock_irqsave(&dev->lock, flags);
690 isdn_tty_stat_callback(i, c);
691 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
692 if (dev->drvmap[i] == di) {
693 dev->drvmap[i] = -1;
694 dev->chanmap[i] = -1;
695 dev->usage[i] &= ~ISDN_USAGE_DISABLED;
696 }
697 dev->drivers--;
698 dev->channels -= dev->drv[di]->channels;
699 kfree(dev->drv[di]->rcverr);
700 kfree(dev->drv[di]->rcvcount);
701 for (i = 0; i < dev->drv[di]->channels; i++)
702 skb_queue_purge(&dev->drv[di]->rpqueue[i]);
703 kfree(dev->drv[di]->rpqueue);
704 kfree(dev->drv[di]->rcv_waitq);
705 kfree(dev->drv[di]);
706 dev->drv[di] = NULL;
707 dev->drvid[di][0] = '\0';
708 isdn_info_update();
709 set_global_features();
710 spin_unlock_irqrestore(&dev->lock, flags);
711 return 0;
712 case ISDN_STAT_L1ERR:
713 break;
714 case CAPI_PUT_MESSAGE:
715 return (isdn_capi_rec_hl_msg(&c->parm.cmsg));
716 #ifdef CONFIG_ISDN_TTY_FAX
717 case ISDN_STAT_FAXIND:
718 isdn_tty_stat_callback(i, c);
719 break;
720 #endif
721 #ifdef CONFIG_ISDN_AUDIO
722 case ISDN_STAT_AUDIO:
723 isdn_tty_stat_callback(i, c);
724 break;
725 #endif
726 #ifdef CONFIG_ISDN_DIVERSION
727 case ISDN_STAT_PROT:
728 case ISDN_STAT_REDIR:
729 if (divert_if)
730 return (divert_if->stat_callback(c));
731 #endif /* CONFIG_ISDN_DIVERSION */
732 default:
733 return -1;
734 }
735 return 0;
736 }
737
738 /*
739 * Get integer from char-pointer, set pointer to end of number
740 */
741 int
isdn_getnum(char ** p)742 isdn_getnum(char **p)
743 {
744 int v = -1;
745
746 while (*p[0] >= '0' && *p[0] <= '9')
747 v = ((v < 0) ? 0 : (v * 10)) + (int) ((*p[0]++) - '0');
748 return v;
749 }
750
751 #define DLE 0x10
752
753 /*
754 * isdn_readbchan() tries to get data from the read-queue.
755 * It MUST be called with interrupts off.
756 *
757 * Be aware that this is not an atomic operation when sleep != 0, even though
758 * interrupts are turned off! Well, like that we are currently only called
759 * on behalf of a read system call on raw device files (which are documented
760 * to be dangerous and for debugging purpose only). The inode semaphore
761 * takes care that this is not called for the same minor device number while
762 * we are sleeping, but access is not serialized against simultaneous read()
763 * from the corresponding ttyI device. Can other ugly events, like changes
764 * of the mapping (di,ch)<->minor, happen during the sleep? --he
765 */
766 int
isdn_readbchan(int di,int channel,u_char * buf,u_char * fp,int len,wait_queue_head_t * sleep)767 isdn_readbchan(int di, int channel, u_char *buf, u_char *fp, int len, wait_queue_head_t *sleep)
768 {
769 int count;
770 int count_pull;
771 int count_put;
772 int dflag;
773 struct sk_buff *skb;
774 u_char *cp;
775
776 if (!dev->drv[di])
777 return 0;
778 if (skb_queue_empty(&dev->drv[di]->rpqueue[channel])) {
779 if (sleep)
780 wait_event_interruptible(*sleep,
781 !skb_queue_empty(&dev->drv[di]->rpqueue[channel]));
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_port * port,int cisco_hack)880 isdn_readbchan_tty(int di, int channel, struct tty_port *port, 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(port, 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(port, 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(port, 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(port, last, 0xFF);
957 else
958 tty_insert_flip_char(port, 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(port, 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_inode(file));
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 wait_event_interruptible(dev->info_waitq,
1077 file->private_data);
1078 }
1079 p = isdn_statstr();
1080 file->private_data = NULL;
1081 if ((len = strlen(p)) <= count) {
1082 if (copy_to_user(buf, p, len)) {
1083 retval = -EFAULT;
1084 goto out;
1085 }
1086 *off += len;
1087 retval = len;
1088 goto out;
1089 }
1090 retval = 0;
1091 goto out;
1092 }
1093 if (!dev->drivers) {
1094 retval = -ENODEV;
1095 goto out;
1096 }
1097 if (minor <= ISDN_MINOR_BMAX) {
1098 printk(KERN_WARNING "isdn_read minor %d obsolete!\n", minor);
1099 drvidx = isdn_minor2drv(minor);
1100 if (drvidx < 0) {
1101 retval = -ENODEV;
1102 goto out;
1103 }
1104 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1105 retval = -ENODEV;
1106 goto out;
1107 }
1108 chidx = isdn_minor2chan(minor);
1109 if (!(p = kmalloc(count, GFP_KERNEL))) {
1110 retval = -ENOMEM;
1111 goto out;
1112 }
1113 len = isdn_readbchan(drvidx, chidx, p, NULL, count,
1114 &dev->drv[drvidx]->rcv_waitq[chidx]);
1115 *off += len;
1116 if (copy_to_user(buf, p, len))
1117 len = -EFAULT;
1118 kfree(p);
1119 retval = len;
1120 goto out;
1121 }
1122 if (minor <= ISDN_MINOR_CTRLMAX) {
1123 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1124 if (drvidx < 0) {
1125 retval = -ENODEV;
1126 goto out;
1127 }
1128 if (!dev->drv[drvidx]->stavail) {
1129 if (file->f_flags & O_NONBLOCK) {
1130 retval = -EAGAIN;
1131 goto out;
1132 }
1133 wait_event_interruptible(dev->drv[drvidx]->st_waitq,
1134 dev->drv[drvidx]->stavail);
1135 }
1136 if (dev->drv[drvidx]->interface->readstat) {
1137 if (count > dev->drv[drvidx]->stavail)
1138 count = dev->drv[drvidx]->stavail;
1139 len = dev->drv[drvidx]->interface->readstat(buf, count,
1140 drvidx, isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1141 if (len < 0) {
1142 retval = len;
1143 goto out;
1144 }
1145 } else {
1146 len = 0;
1147 }
1148 if (len)
1149 dev->drv[drvidx]->stavail -= len;
1150 else
1151 dev->drv[drvidx]->stavail = 0;
1152 *off += len;
1153 retval = len;
1154 goto out;
1155 }
1156 #ifdef CONFIG_ISDN_PPP
1157 if (minor <= ISDN_MINOR_PPPMAX) {
1158 retval = isdn_ppp_read(minor - ISDN_MINOR_PPP, file, buf, count);
1159 goto out;
1160 }
1161 #endif
1162 retval = -ENODEV;
1163 out:
1164 mutex_unlock(&isdn_mutex);
1165 return retval;
1166 }
1167
1168 static ssize_t
isdn_write(struct file * file,const char __user * buf,size_t count,loff_t * off)1169 isdn_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
1170 {
1171 uint minor = iminor(file_inode(file));
1172 int drvidx;
1173 int chidx;
1174 int retval;
1175
1176 if (minor == ISDN_MINOR_STATUS)
1177 return -EPERM;
1178 if (!dev->drivers)
1179 return -ENODEV;
1180
1181 mutex_lock(&isdn_mutex);
1182 if (minor <= ISDN_MINOR_BMAX) {
1183 printk(KERN_WARNING "isdn_write minor %d obsolete!\n", minor);
1184 drvidx = isdn_minor2drv(minor);
1185 if (drvidx < 0) {
1186 retval = -ENODEV;
1187 goto out;
1188 }
1189 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1190 retval = -ENODEV;
1191 goto out;
1192 }
1193 chidx = isdn_minor2chan(minor);
1194 wait_event_interruptible(dev->drv[drvidx]->snd_waitq[chidx],
1195 (retval = isdn_writebuf_stub(drvidx, chidx, buf, count)));
1196 goto out;
1197 }
1198 if (minor <= ISDN_MINOR_CTRLMAX) {
1199 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1200 if (drvidx < 0) {
1201 retval = -ENODEV;
1202 goto out;
1203 }
1204 /*
1205 * We want to use the isdnctrl device to load the firmware
1206 *
1207 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1208 return -ENODEV;
1209 */
1210 if (dev->drv[drvidx]->interface->writecmd)
1211 retval = dev->drv[drvidx]->interface->
1212 writecmd(buf, count, drvidx,
1213 isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1214 else
1215 retval = count;
1216 goto out;
1217 }
1218 #ifdef CONFIG_ISDN_PPP
1219 if (minor <= ISDN_MINOR_PPPMAX) {
1220 retval = isdn_ppp_write(minor - ISDN_MINOR_PPP, file, buf, count);
1221 goto out;
1222 }
1223 #endif
1224 retval = -ENODEV;
1225 out:
1226 mutex_unlock(&isdn_mutex);
1227 return retval;
1228 }
1229
1230 static __poll_t
isdn_poll(struct file * file,poll_table * wait)1231 isdn_poll(struct file *file, poll_table *wait)
1232 {
1233 __poll_t mask = 0;
1234 unsigned int minor = iminor(file_inode(file));
1235 int drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1236
1237 mutex_lock(&isdn_mutex);
1238 if (minor == ISDN_MINOR_STATUS) {
1239 poll_wait(file, &(dev->info_waitq), wait);
1240 /* mask = EPOLLOUT | EPOLLWRNORM; */
1241 if (file->private_data) {
1242 mask |= EPOLLIN | EPOLLRDNORM;
1243 }
1244 goto out;
1245 }
1246 if (minor >= ISDN_MINOR_CTRL && minor <= ISDN_MINOR_CTRLMAX) {
1247 if (drvidx < 0) {
1248 /* driver deregistered while file open */
1249 mask = EPOLLHUP;
1250 goto out;
1251 }
1252 poll_wait(file, &(dev->drv[drvidx]->st_waitq), wait);
1253 mask = EPOLLOUT | EPOLLWRNORM;
1254 if (dev->drv[drvidx]->stavail) {
1255 mask |= EPOLLIN | EPOLLRDNORM;
1256 }
1257 goto out;
1258 }
1259 #ifdef CONFIG_ISDN_PPP
1260 if (minor <= ISDN_MINOR_PPPMAX) {
1261 mask = isdn_ppp_poll(file, wait);
1262 goto out;
1263 }
1264 #endif
1265 mask = EPOLLERR;
1266 out:
1267 mutex_unlock(&isdn_mutex);
1268 return mask;
1269 }
1270
1271
1272 static int
isdn_ioctl(struct file * file,uint cmd,ulong arg)1273 isdn_ioctl(struct file *file, uint cmd, ulong arg)
1274 {
1275 uint minor = iminor(file_inode(file));
1276 isdn_ctrl c;
1277 int drvidx;
1278 int ret;
1279 int i;
1280 char __user *p;
1281 char *s;
1282 union iocpar {
1283 char name[10];
1284 char bname[22];
1285 isdn_ioctl_struct iocts;
1286 isdn_net_ioctl_phone phone;
1287 isdn_net_ioctl_cfg cfg;
1288 } iocpar;
1289 void __user *argp = (void __user *)arg;
1290
1291 #define name iocpar.name
1292 #define bname iocpar.bname
1293 #define iocts iocpar.iocts
1294 #define phone iocpar.phone
1295 #define cfg iocpar.cfg
1296
1297 if (minor == ISDN_MINOR_STATUS) {
1298 switch (cmd) {
1299 case IIOCGETDVR:
1300 return (TTY_DV +
1301 (NET_DV << 8) +
1302 (INF_DV << 16));
1303 case IIOCGETCPS:
1304 if (arg) {
1305 ulong __user *p = argp;
1306 int i;
1307 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1308 put_user(dev->ibytes[i], p++);
1309 put_user(dev->obytes[i], p++);
1310 }
1311 return 0;
1312 } else
1313 return -EINVAL;
1314 break;
1315 case IIOCNETGPN:
1316 /* Get peer phone number of a connected
1317 * isdn network interface */
1318 if (arg) {
1319 if (copy_from_user(&phone, argp, sizeof(phone)))
1320 return -EFAULT;
1321 return isdn_net_getpeer(&phone, argp);
1322 } else
1323 return -EINVAL;
1324 default:
1325 return -EINVAL;
1326 }
1327 }
1328 if (!dev->drivers)
1329 return -ENODEV;
1330 if (minor <= ISDN_MINOR_BMAX) {
1331 drvidx = isdn_minor2drv(minor);
1332 if (drvidx < 0)
1333 return -ENODEV;
1334 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1335 return -ENODEV;
1336 return 0;
1337 }
1338 if (minor <= ISDN_MINOR_CTRLMAX) {
1339 /*
1340 * isdn net devices manage lots of configuration variables as linked lists.
1341 * Those lists must only be manipulated from user space. Some of the ioctl's
1342 * service routines access user space and are not atomic. Therefore, ioctl's
1343 * manipulating the lists and ioctl's sleeping while accessing the lists
1344 * are serialized by means of a semaphore.
1345 */
1346 switch (cmd) {
1347 case IIOCNETDWRSET:
1348 printk(KERN_INFO "INFO: ISDN_DW_ABC_EXTENSION not enabled\n");
1349 return (-EINVAL);
1350 case IIOCNETLCR:
1351 printk(KERN_INFO "INFO: ISDN_ABC_LCR_SUPPORT not enabled\n");
1352 return -ENODEV;
1353 case IIOCNETAIF:
1354 /* Add a network-interface */
1355 if (arg) {
1356 if (copy_from_user(name, argp, sizeof(name)))
1357 return -EFAULT;
1358 s = name;
1359 } else {
1360 s = NULL;
1361 }
1362 ret = mutex_lock_interruptible(&dev->mtx);
1363 if (ret) return ret;
1364 if ((s = isdn_net_new(s, NULL))) {
1365 if (copy_to_user(argp, s, strlen(s) + 1)) {
1366 ret = -EFAULT;
1367 } else {
1368 ret = 0;
1369 }
1370 } else
1371 ret = -ENODEV;
1372 mutex_unlock(&dev->mtx);
1373 return ret;
1374 case IIOCNETASL:
1375 /* Add a slave to a network-interface */
1376 if (arg) {
1377 if (copy_from_user(bname, argp, sizeof(bname) - 1))
1378 return -EFAULT;
1379 bname[sizeof(bname)-1] = 0;
1380 } else
1381 return -EINVAL;
1382 ret = mutex_lock_interruptible(&dev->mtx);
1383 if (ret) return ret;
1384 if ((s = isdn_net_newslave(bname))) {
1385 if (copy_to_user(argp, s, strlen(s) + 1)) {
1386 ret = -EFAULT;
1387 } else {
1388 ret = 0;
1389 }
1390 } else
1391 ret = -ENODEV;
1392 mutex_unlock(&dev->mtx);
1393 return ret;
1394 case IIOCNETDIF:
1395 /* Delete a network-interface */
1396 if (arg) {
1397 if (copy_from_user(name, argp, sizeof(name)))
1398 return -EFAULT;
1399 ret = mutex_lock_interruptible(&dev->mtx);
1400 if (ret) return ret;
1401 ret = isdn_net_rm(name);
1402 mutex_unlock(&dev->mtx);
1403 return ret;
1404 } else
1405 return -EINVAL;
1406 case IIOCNETSCF:
1407 /* Set configurable parameters of a network-interface */
1408 if (arg) {
1409 if (copy_from_user(&cfg, argp, sizeof(cfg)))
1410 return -EFAULT;
1411 return isdn_net_setcfg(&cfg);
1412 } else
1413 return -EINVAL;
1414 case IIOCNETGCF:
1415 /* Get configurable parameters of a network-interface */
1416 if (arg) {
1417 if (copy_from_user(&cfg, argp, sizeof(cfg)))
1418 return -EFAULT;
1419 if (!(ret = isdn_net_getcfg(&cfg))) {
1420 if (copy_to_user(argp, &cfg, sizeof(cfg)))
1421 return -EFAULT;
1422 }
1423 return ret;
1424 } else
1425 return -EINVAL;
1426 case IIOCNETANM:
1427 /* Add a phone-number to a network-interface */
1428 if (arg) {
1429 if (copy_from_user(&phone, argp, sizeof(phone)))
1430 return -EFAULT;
1431 ret = mutex_lock_interruptible(&dev->mtx);
1432 if (ret) return ret;
1433 ret = isdn_net_addphone(&phone);
1434 mutex_unlock(&dev->mtx);
1435 return ret;
1436 } else
1437 return -EINVAL;
1438 case IIOCNETGNM:
1439 /* Get list of phone-numbers of a network-interface */
1440 if (arg) {
1441 if (copy_from_user(&phone, argp, sizeof(phone)))
1442 return -EFAULT;
1443 ret = mutex_lock_interruptible(&dev->mtx);
1444 if (ret) return ret;
1445 ret = isdn_net_getphones(&phone, argp);
1446 mutex_unlock(&dev->mtx);
1447 return ret;
1448 } else
1449 return -EINVAL;
1450 case IIOCNETDNM:
1451 /* Delete a phone-number of a network-interface */
1452 if (arg) {
1453 if (copy_from_user(&phone, argp, sizeof(phone)))
1454 return -EFAULT;
1455 ret = mutex_lock_interruptible(&dev->mtx);
1456 if (ret) return ret;
1457 ret = isdn_net_delphone(&phone);
1458 mutex_unlock(&dev->mtx);
1459 return ret;
1460 } else
1461 return -EINVAL;
1462 case IIOCNETDIL:
1463 /* Force dialing of a network-interface */
1464 if (arg) {
1465 if (copy_from_user(name, argp, sizeof(name)))
1466 return -EFAULT;
1467 return isdn_net_force_dial(name);
1468 } else
1469 return -EINVAL;
1470 #ifdef CONFIG_ISDN_PPP
1471 case IIOCNETALN:
1472 if (!arg)
1473 return -EINVAL;
1474 if (copy_from_user(name, argp, sizeof(name)))
1475 return -EFAULT;
1476 return isdn_ppp_dial_slave(name);
1477 case IIOCNETDLN:
1478 if (!arg)
1479 return -EINVAL;
1480 if (copy_from_user(name, argp, sizeof(name)))
1481 return -EFAULT;
1482 return isdn_ppp_hangup_slave(name);
1483 #endif
1484 case IIOCNETHUP:
1485 /* Force hangup of a network-interface */
1486 if (!arg)
1487 return -EINVAL;
1488 if (copy_from_user(name, argp, sizeof(name)))
1489 return -EFAULT;
1490 return isdn_net_force_hangup(name);
1491 break;
1492 case IIOCSETVER:
1493 dev->net_verbose = arg;
1494 printk(KERN_INFO "isdn: Verbose-Level is %d\n", dev->net_verbose);
1495 return 0;
1496 case IIOCSETGST:
1497 if (arg)
1498 dev->global_flags |= ISDN_GLOBAL_STOPPED;
1499 else
1500 dev->global_flags &= ~ISDN_GLOBAL_STOPPED;
1501 printk(KERN_INFO "isdn: Global Mode %s\n",
1502 (dev->global_flags & ISDN_GLOBAL_STOPPED) ? "stopped" : "running");
1503 return 0;
1504 case IIOCSETBRJ:
1505 drvidx = -1;
1506 if (arg) {
1507 int i;
1508 char *p;
1509 if (copy_from_user(&iocts, argp,
1510 sizeof(isdn_ioctl_struct)))
1511 return -EFAULT;
1512 iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1513 if (strlen(iocts.drvid)) {
1514 if ((p = strchr(iocts.drvid, ',')))
1515 *p = 0;
1516 drvidx = -1;
1517 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1518 if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1519 drvidx = i;
1520 break;
1521 }
1522 }
1523 }
1524 if (drvidx == -1)
1525 return -ENODEV;
1526 if (iocts.arg)
1527 dev->drv[drvidx]->flags |= DRV_FLAG_REJBUS;
1528 else
1529 dev->drv[drvidx]->flags &= ~DRV_FLAG_REJBUS;
1530 return 0;
1531 case IIOCSIGPRF:
1532 dev->profd = current;
1533 return 0;
1534 break;
1535 case IIOCGETPRF:
1536 /* Get all Modem-Profiles */
1537 if (arg) {
1538 char __user *p = argp;
1539 int i;
1540
1541 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1542 if (copy_to_user(p, dev->mdm.info[i].emu.profile,
1543 ISDN_MODEM_NUMREG))
1544 return -EFAULT;
1545 p += ISDN_MODEM_NUMREG;
1546 if (copy_to_user(p, dev->mdm.info[i].emu.pmsn, ISDN_MSNLEN))
1547 return -EFAULT;
1548 p += ISDN_MSNLEN;
1549 if (copy_to_user(p, dev->mdm.info[i].emu.plmsn, ISDN_LMSNLEN))
1550 return -EFAULT;
1551 p += ISDN_LMSNLEN;
1552 }
1553 return (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN) * ISDN_MAX_CHANNELS;
1554 } else
1555 return -EINVAL;
1556 break;
1557 case IIOCSETPRF:
1558 /* Set all Modem-Profiles */
1559 if (arg) {
1560 char __user *p = argp;
1561 int i;
1562
1563 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1564 if (copy_from_user(dev->mdm.info[i].emu.profile, p,
1565 ISDN_MODEM_NUMREG))
1566 return -EFAULT;
1567 p += ISDN_MODEM_NUMREG;
1568 if (copy_from_user(dev->mdm.info[i].emu.plmsn, p, ISDN_LMSNLEN))
1569 return -EFAULT;
1570 p += ISDN_LMSNLEN;
1571 if (copy_from_user(dev->mdm.info[i].emu.pmsn, p, ISDN_MSNLEN))
1572 return -EFAULT;
1573 p += ISDN_MSNLEN;
1574 }
1575 return 0;
1576 } else
1577 return -EINVAL;
1578 break;
1579 case IIOCSETMAP:
1580 case IIOCGETMAP:
1581 /* Set/Get MSN->EAZ-Mapping for a driver */
1582 if (arg) {
1583
1584 if (copy_from_user(&iocts, argp,
1585 sizeof(isdn_ioctl_struct)))
1586 return -EFAULT;
1587 iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1588 if (strlen(iocts.drvid)) {
1589 drvidx = -1;
1590 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1591 if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1592 drvidx = i;
1593 break;
1594 }
1595 } else
1596 drvidx = 0;
1597 if (drvidx == -1)
1598 return -ENODEV;
1599 if (cmd == IIOCSETMAP) {
1600 int loop = 1;
1601
1602 p = (char __user *) iocts.arg;
1603 i = 0;
1604 while (loop) {
1605 int j = 0;
1606
1607 while (1) {
1608 get_user(bname[j], p++);
1609 switch (bname[j]) {
1610 case '\0':
1611 loop = 0;
1612 /* Fall through */
1613 case ',':
1614 bname[j] = '\0';
1615 strcpy(dev->drv[drvidx]->msn2eaz[i], bname);
1616 j = ISDN_MSNLEN;
1617 break;
1618 default:
1619 j++;
1620 }
1621 if (j >= ISDN_MSNLEN)
1622 break;
1623 }
1624 if (++i > 9)
1625 break;
1626 }
1627 } else {
1628 p = (char __user *) iocts.arg;
1629 for (i = 0; i < 10; i++) {
1630 snprintf(bname, sizeof(bname), "%s%s",
1631 strlen(dev->drv[drvidx]->msn2eaz[i]) ?
1632 dev->drv[drvidx]->msn2eaz[i] : "_",
1633 (i < 9) ? "," : "\0");
1634 if (copy_to_user(p, bname, strlen(bname) + 1))
1635 return -EFAULT;
1636 p += strlen(bname);
1637 }
1638 }
1639 return 0;
1640 } else
1641 return -EINVAL;
1642 case IIOCDBGVAR:
1643 return -EINVAL;
1644 default:
1645 if ((cmd & IIOCDRVCTL) == IIOCDRVCTL)
1646 cmd = ((cmd >> _IOC_NRSHIFT) & _IOC_NRMASK) & ISDN_DRVIOCTL_MASK;
1647 else
1648 return -EINVAL;
1649 if (arg) {
1650 int i;
1651 char *p;
1652 if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct)))
1653 return -EFAULT;
1654 iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
1655 if (strlen(iocts.drvid)) {
1656 if ((p = strchr(iocts.drvid, ',')))
1657 *p = 0;
1658 drvidx = -1;
1659 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1660 if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1661 drvidx = i;
1662 break;
1663 }
1664 } else
1665 drvidx = 0;
1666 if (drvidx == -1)
1667 return -ENODEV;
1668 c.driver = drvidx;
1669 c.command = ISDN_CMD_IOCTL;
1670 c.arg = cmd;
1671 memcpy(c.parm.num, &iocts.arg, sizeof(ulong));
1672 ret = isdn_command(&c);
1673 memcpy(&iocts.arg, c.parm.num, sizeof(ulong));
1674 if (copy_to_user(argp, &iocts, sizeof(isdn_ioctl_struct)))
1675 return -EFAULT;
1676 return ret;
1677 } else
1678 return -EINVAL;
1679 }
1680 }
1681 #ifdef CONFIG_ISDN_PPP
1682 if (minor <= ISDN_MINOR_PPPMAX)
1683 return (isdn_ppp_ioctl(minor - ISDN_MINOR_PPP, file, cmd, arg));
1684 #endif
1685 return -ENODEV;
1686
1687 #undef name
1688 #undef bname
1689 #undef iocts
1690 #undef phone
1691 #undef cfg
1692 }
1693
1694 static long
isdn_unlocked_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1695 isdn_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1696 {
1697 int ret;
1698
1699 mutex_lock(&isdn_mutex);
1700 ret = isdn_ioctl(file, cmd, arg);
1701 mutex_unlock(&isdn_mutex);
1702
1703 return ret;
1704 }
1705
1706 /*
1707 * Open the device code.
1708 */
1709 static int
isdn_open(struct inode * ino,struct file * filep)1710 isdn_open(struct inode *ino, struct file *filep)
1711 {
1712 uint minor = iminor(ino);
1713 int drvidx;
1714 int chidx;
1715 int retval = -ENODEV;
1716
1717 mutex_lock(&isdn_mutex);
1718 if (minor == ISDN_MINOR_STATUS) {
1719 infostruct *p;
1720
1721 if ((p = kmalloc(sizeof(infostruct), GFP_KERNEL))) {
1722 p->next = (char *) dev->infochain;
1723 p->private = (char *) &(filep->private_data);
1724 dev->infochain = p;
1725 /* At opening we allow a single update */
1726 filep->private_data = (char *) 1;
1727 retval = 0;
1728 goto out;
1729 } else {
1730 retval = -ENOMEM;
1731 goto out;
1732 }
1733 }
1734 if (!dev->channels)
1735 goto out;
1736 if (minor <= ISDN_MINOR_BMAX) {
1737 printk(KERN_WARNING "isdn_open minor %d obsolete!\n", minor);
1738 drvidx = isdn_minor2drv(minor);
1739 if (drvidx < 0)
1740 goto out;
1741 chidx = isdn_minor2chan(minor);
1742 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1743 goto out;
1744 if (!(dev->drv[drvidx]->online & (1 << chidx)))
1745 goto out;
1746 isdn_lock_drivers();
1747 retval = 0;
1748 goto out;
1749 }
1750 if (minor <= ISDN_MINOR_CTRLMAX) {
1751 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1752 if (drvidx < 0)
1753 goto out;
1754 isdn_lock_drivers();
1755 retval = 0;
1756 goto out;
1757 }
1758 #ifdef CONFIG_ISDN_PPP
1759 if (minor <= ISDN_MINOR_PPPMAX) {
1760 retval = isdn_ppp_open(minor - ISDN_MINOR_PPP, filep);
1761 if (retval == 0)
1762 isdn_lock_drivers();
1763 goto out;
1764 }
1765 #endif
1766 out:
1767 nonseekable_open(ino, filep);
1768 mutex_unlock(&isdn_mutex);
1769 return retval;
1770 }
1771
1772 static int
isdn_close(struct inode * ino,struct file * filep)1773 isdn_close(struct inode *ino, struct file *filep)
1774 {
1775 uint minor = iminor(ino);
1776
1777 mutex_lock(&isdn_mutex);
1778 if (minor == ISDN_MINOR_STATUS) {
1779 infostruct *p = dev->infochain;
1780 infostruct *q = NULL;
1781
1782 while (p) {
1783 if (p->private == (char *) &(filep->private_data)) {
1784 if (q)
1785 q->next = p->next;
1786 else
1787 dev->infochain = (infostruct *) (p->next);
1788 kfree(p);
1789 goto out;
1790 }
1791 q = p;
1792 p = (infostruct *) (p->next);
1793 }
1794 printk(KERN_WARNING "isdn: No private data while closing isdnctrl\n");
1795 goto out;
1796 }
1797 isdn_unlock_drivers();
1798 if (minor <= ISDN_MINOR_BMAX)
1799 goto out;
1800 if (minor <= ISDN_MINOR_CTRLMAX) {
1801 if (dev->profd == current)
1802 dev->profd = NULL;
1803 goto out;
1804 }
1805 #ifdef CONFIG_ISDN_PPP
1806 if (minor <= ISDN_MINOR_PPPMAX)
1807 isdn_ppp_release(minor - ISDN_MINOR_PPP, filep);
1808 #endif
1809
1810 out:
1811 mutex_unlock(&isdn_mutex);
1812 return 0;
1813 }
1814
1815 static const struct file_operations isdn_fops =
1816 {
1817 .owner = THIS_MODULE,
1818 .llseek = no_llseek,
1819 .read = isdn_read,
1820 .write = isdn_write,
1821 .poll = isdn_poll,
1822 .unlocked_ioctl = isdn_unlocked_ioctl,
1823 .open = isdn_open,
1824 .release = isdn_close,
1825 };
1826
1827 char *
isdn_map_eaz2msn(char * msn,int di)1828 isdn_map_eaz2msn(char *msn, int di)
1829 {
1830 isdn_driver_t *this = dev->drv[di];
1831 int i;
1832
1833 if (strlen(msn) == 1) {
1834 i = msn[0] - '0';
1835 if ((i >= 0) && (i <= 9))
1836 if (strlen(this->msn2eaz[i]))
1837 return (this->msn2eaz[i]);
1838 }
1839 return (msn);
1840 }
1841
1842 /*
1843 * Find an unused ISDN-channel, whose feature-flags match the
1844 * given L2- and L3-protocols.
1845 */
1846 #define L2V (~(ISDN_FEATURE_L2_V11096 | ISDN_FEATURE_L2_V11019 | ISDN_FEATURE_L2_V11038))
1847
1848 /*
1849 * This function must be called with holding the dev->lock.
1850 */
1851 int
isdn_get_free_channel(int usage,int l2_proto,int l3_proto,int pre_dev,int pre_chan,char * msn)1852 isdn_get_free_channel(int usage, int l2_proto, int l3_proto, int pre_dev
1853 , int pre_chan, char *msn)
1854 {
1855 int i;
1856 ulong features;
1857 ulong vfeatures;
1858
1859 features = ((1 << l2_proto) | (0x10000 << l3_proto));
1860 vfeatures = (((1 << l2_proto) | (0x10000 << l3_proto)) &
1861 ~(ISDN_FEATURE_L2_V11096 | ISDN_FEATURE_L2_V11019 | ISDN_FEATURE_L2_V11038));
1862 /* If Layer-2 protocol is V.110, accept drivers with
1863 * transparent feature even if these don't support V.110
1864 * because we can emulate this in linklevel.
1865 */
1866 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1867 if (USG_NONE(dev->usage[i]) &&
1868 (dev->drvmap[i] != -1)) {
1869 int d = dev->drvmap[i];
1870 if ((dev->usage[i] & ISDN_USAGE_EXCLUSIVE) &&
1871 ((pre_dev != d) || (pre_chan != dev->chanmap[i])))
1872 continue;
1873 if (!strcmp(isdn_map_eaz2msn(msn, d), "-"))
1874 continue;
1875 if (dev->usage[i] & ISDN_USAGE_DISABLED)
1876 continue; /* usage not allowed */
1877 if (dev->drv[d]->flags & DRV_FLAG_RUNNING) {
1878 if (((dev->drv[d]->interface->features & features) == features) ||
1879 (((dev->drv[d]->interface->features & vfeatures) == vfeatures) &&
1880 (dev->drv[d]->interface->features & ISDN_FEATURE_L2_TRANS))) {
1881 if ((pre_dev < 0) || (pre_chan < 0)) {
1882 dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1883 dev->usage[i] |= usage;
1884 isdn_info_update();
1885 return i;
1886 } else {
1887 if ((pre_dev == d) && (pre_chan == dev->chanmap[i])) {
1888 dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1889 dev->usage[i] |= usage;
1890 isdn_info_update();
1891 return i;
1892 }
1893 }
1894 }
1895 }
1896 }
1897 return -1;
1898 }
1899
1900 /*
1901 * Set state of ISDN-channel to 'unused'
1902 */
1903 void
isdn_free_channel(int di,int ch,int usage)1904 isdn_free_channel(int di, int ch, int usage)
1905 {
1906 int i;
1907
1908 if ((di < 0) || (ch < 0)) {
1909 printk(KERN_WARNING "%s: called with invalid drv(%d) or channel(%d)\n",
1910 __func__, di, ch);
1911 return;
1912 }
1913 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1914 if (((!usage) || ((dev->usage[i] & ISDN_USAGE_MASK) == usage)) &&
1915 (dev->drvmap[i] == di) &&
1916 (dev->chanmap[i] == ch)) {
1917 dev->usage[i] &= (ISDN_USAGE_NONE | ISDN_USAGE_EXCLUSIVE);
1918 strcpy(dev->num[i], "???");
1919 dev->ibytes[i] = 0;
1920 dev->obytes[i] = 0;
1921 // 20.10.99 JIM, try to reinitialize v110 !
1922 dev->v110emu[i] = 0;
1923 atomic_set(&(dev->v110use[i]), 0);
1924 isdn_v110_close(dev->v110[i]);
1925 dev->v110[i] = NULL;
1926 // 20.10.99 JIM, try to reinitialize v110 !
1927 isdn_info_update();
1928 if (dev->drv[di])
1929 skb_queue_purge(&dev->drv[di]->rpqueue[ch]);
1930 }
1931 }
1932
1933 /*
1934 * Cancel Exclusive-Flag for ISDN-channel
1935 */
1936 void
isdn_unexclusive_channel(int di,int ch)1937 isdn_unexclusive_channel(int di, int ch)
1938 {
1939 int i;
1940
1941 for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1942 if ((dev->drvmap[i] == di) &&
1943 (dev->chanmap[i] == ch)) {
1944 dev->usage[i] &= ~ISDN_USAGE_EXCLUSIVE;
1945 isdn_info_update();
1946 return;
1947 }
1948 }
1949
1950 /*
1951 * writebuf replacement for SKB_ABLE drivers
1952 */
1953 static int
isdn_writebuf_stub(int drvidx,int chan,const u_char __user * buf,int len)1954 isdn_writebuf_stub(int drvidx, int chan, const u_char __user *buf, int len)
1955 {
1956 int ret;
1957 int hl = dev->drv[drvidx]->interface->hl_hdrlen;
1958 struct sk_buff *skb = alloc_skb(hl + len, GFP_ATOMIC);
1959
1960 if (!skb)
1961 return -ENOMEM;
1962 skb_reserve(skb, hl);
1963 if (copy_from_user(skb_put(skb, len), buf, len)) {
1964 dev_kfree_skb(skb);
1965 return -EFAULT;
1966 }
1967 ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
1968 if (ret <= 0)
1969 dev_kfree_skb(skb);
1970 if (ret > 0)
1971 dev->obytes[isdn_dc2minor(drvidx, chan)] += ret;
1972 return ret;
1973 }
1974
1975 /*
1976 * Return: length of data on success, -ERRcode on failure.
1977 */
1978 int
isdn_writebuf_skb_stub(int drvidx,int chan,int ack,struct sk_buff * skb)1979 isdn_writebuf_skb_stub(int drvidx, int chan, int ack, struct sk_buff *skb)
1980 {
1981 int ret;
1982 struct sk_buff *nskb = NULL;
1983 int v110_ret = skb->len;
1984 int idx = isdn_dc2minor(drvidx, chan);
1985
1986 if (dev->v110[idx]) {
1987 atomic_inc(&dev->v110use[idx]);
1988 nskb = isdn_v110_encode(dev->v110[idx], skb);
1989 atomic_dec(&dev->v110use[idx]);
1990 if (!nskb)
1991 return 0;
1992 v110_ret = *((int *)nskb->data);
1993 skb_pull(nskb, sizeof(int));
1994 if (!nskb->len) {
1995 dev_kfree_skb(nskb);
1996 return v110_ret;
1997 }
1998 /* V.110 must always be acknowledged */
1999 ack = 1;
2000 ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, nskb);
2001 } else {
2002 int hl = dev->drv[drvidx]->interface->hl_hdrlen;
2003
2004 if (skb_headroom(skb) < hl) {
2005 /*
2006 * This should only occur when new HL driver with
2007 * increased hl_hdrlen was loaded after netdevice
2008 * was created and connected to the new driver.
2009 *
2010 * The V.110 branch (re-allocates on its own) does
2011 * not need this
2012 */
2013 struct sk_buff *skb_tmp;
2014
2015 skb_tmp = skb_realloc_headroom(skb, hl);
2016 printk(KERN_DEBUG "isdn_writebuf_skb_stub: reallocating headroom%s\n", skb_tmp ? "" : " failed");
2017 if (!skb_tmp) return -ENOMEM; /* 0 better? */
2018 ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb_tmp);
2019 if (ret > 0) {
2020 dev_kfree_skb(skb);
2021 } else {
2022 dev_kfree_skb(skb_tmp);
2023 }
2024 } else {
2025 ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb);
2026 }
2027 }
2028 if (ret > 0) {
2029 dev->obytes[idx] += ret;
2030 if (dev->v110[idx]) {
2031 atomic_inc(&dev->v110use[idx]);
2032 dev->v110[idx]->skbuser++;
2033 atomic_dec(&dev->v110use[idx]);
2034 /* For V.110 return unencoded data length */
2035 ret = v110_ret;
2036 /* if the complete frame was send we free the skb;
2037 if not upper function will requeue the skb */
2038 if (ret == skb->len)
2039 dev_kfree_skb(skb);
2040 }
2041 } else
2042 if (dev->v110[idx])
2043 dev_kfree_skb(nskb);
2044 return ret;
2045 }
2046
2047 static int
isdn_add_channels(isdn_driver_t * d,int drvidx,int n,int adding)2048 isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding)
2049 {
2050 int j, k, m;
2051
2052 init_waitqueue_head(&d->st_waitq);
2053 if (d->flags & DRV_FLAG_RUNNING)
2054 return -1;
2055 if (n < 1) return 0;
2056
2057 m = (adding) ? d->channels + n : n;
2058
2059 if (dev->channels + n > ISDN_MAX_CHANNELS) {
2060 printk(KERN_WARNING "register_isdn: Max. %d channels supported\n",
2061 ISDN_MAX_CHANNELS);
2062 return -1;
2063 }
2064
2065 if ((adding) && (d->rcverr))
2066 kfree(d->rcverr);
2067 if (!(d->rcverr = kcalloc(m, sizeof(int), GFP_ATOMIC))) {
2068 printk(KERN_WARNING "register_isdn: Could not alloc rcverr\n");
2069 return -1;
2070 }
2071
2072 if ((adding) && (d->rcvcount))
2073 kfree(d->rcvcount);
2074 if (!(d->rcvcount = kcalloc(m, sizeof(int), GFP_ATOMIC))) {
2075 printk(KERN_WARNING "register_isdn: Could not alloc rcvcount\n");
2076 if (!adding)
2077 kfree(d->rcverr);
2078 return -1;
2079 }
2080
2081 if ((adding) && (d->rpqueue)) {
2082 for (j = 0; j < d->channels; j++)
2083 skb_queue_purge(&d->rpqueue[j]);
2084 kfree(d->rpqueue);
2085 }
2086 d->rpqueue = kmalloc_array(m, sizeof(struct sk_buff_head), GFP_ATOMIC);
2087 if (!d->rpqueue) {
2088 printk(KERN_WARNING "register_isdn: Could not alloc rpqueue\n");
2089 if (!adding) {
2090 kfree(d->rcvcount);
2091 kfree(d->rcverr);
2092 }
2093 return -1;
2094 }
2095 for (j = 0; j < m; j++) {
2096 skb_queue_head_init(&d->rpqueue[j]);
2097 }
2098
2099 if ((adding) && (d->rcv_waitq))
2100 kfree(d->rcv_waitq);
2101 d->rcv_waitq = kmalloc(array3_size(sizeof(wait_queue_head_t), 2, m),
2102 GFP_ATOMIC);
2103 if (!d->rcv_waitq) {
2104 printk(KERN_WARNING "register_isdn: Could not alloc rcv_waitq\n");
2105 if (!adding) {
2106 kfree(d->rpqueue);
2107 kfree(d->rcvcount);
2108 kfree(d->rcverr);
2109 }
2110 return -1;
2111 }
2112 d->snd_waitq = d->rcv_waitq + m;
2113 for (j = 0; j < m; j++) {
2114 init_waitqueue_head(&d->rcv_waitq[j]);
2115 init_waitqueue_head(&d->snd_waitq[j]);
2116 }
2117
2118 dev->channels += n;
2119 for (j = d->channels; j < m; j++)
2120 for (k = 0; k < ISDN_MAX_CHANNELS; k++)
2121 if (dev->chanmap[k] < 0) {
2122 dev->chanmap[k] = j;
2123 dev->drvmap[k] = drvidx;
2124 break;
2125 }
2126 d->channels = m;
2127 return 0;
2128 }
2129
2130 /*
2131 * Low-level-driver registration
2132 */
2133
2134 static void
set_global_features(void)2135 set_global_features(void)
2136 {
2137 int drvidx;
2138
2139 dev->global_features = 0;
2140 for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++) {
2141 if (!dev->drv[drvidx])
2142 continue;
2143 if (dev->drv[drvidx]->interface)
2144 dev->global_features |= dev->drv[drvidx]->interface->features;
2145 }
2146 }
2147
2148 #ifdef CONFIG_ISDN_DIVERSION
2149
map_drvname(int di)2150 static char *map_drvname(int di)
2151 {
2152 if ((di < 0) || (di >= ISDN_MAX_DRIVERS))
2153 return (NULL);
2154 return (dev->drvid[di]); /* driver name */
2155 } /* map_drvname */
2156
map_namedrv(char * id)2157 static int map_namedrv(char *id)
2158 { int i;
2159
2160 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2161 { if (!strcmp(dev->drvid[i], id))
2162 return (i);
2163 }
2164 return (-1);
2165 } /* map_namedrv */
2166
DIVERT_REG_NAME(isdn_divert_if * i_div)2167 int DIVERT_REG_NAME(isdn_divert_if *i_div)
2168 {
2169 if (i_div->if_magic != DIVERT_IF_MAGIC)
2170 return (DIVERT_VER_ERR);
2171 switch (i_div->cmd)
2172 {
2173 case DIVERT_CMD_REL:
2174 if (divert_if != i_div)
2175 return (DIVERT_REL_ERR);
2176 divert_if = NULL; /* free interface */
2177 return (DIVERT_NO_ERR);
2178
2179 case DIVERT_CMD_REG:
2180 if (divert_if)
2181 return (DIVERT_REG_ERR);
2182 i_div->ll_cmd = isdn_command; /* set command function */
2183 i_div->drv_to_name = map_drvname;
2184 i_div->name_to_drv = map_namedrv;
2185 divert_if = i_div; /* remember interface */
2186 return (DIVERT_NO_ERR);
2187
2188 default:
2189 return (DIVERT_CMD_ERR);
2190 }
2191 } /* DIVERT_REG_NAME */
2192
2193 EXPORT_SYMBOL(DIVERT_REG_NAME);
2194
2195 #endif /* CONFIG_ISDN_DIVERSION */
2196
2197
2198 EXPORT_SYMBOL(register_isdn);
2199 #ifdef CONFIG_ISDN_PPP
2200 EXPORT_SYMBOL(isdn_ppp_register_compressor);
2201 EXPORT_SYMBOL(isdn_ppp_unregister_compressor);
2202 #endif
2203
2204 int
register_isdn(isdn_if * i)2205 register_isdn(isdn_if *i)
2206 {
2207 isdn_driver_t *d;
2208 int j;
2209 ulong flags;
2210 int drvidx;
2211
2212 if (dev->drivers >= ISDN_MAX_DRIVERS) {
2213 printk(KERN_WARNING "register_isdn: Max. %d drivers supported\n",
2214 ISDN_MAX_DRIVERS);
2215 return 0;
2216 }
2217 if (!i->writebuf_skb) {
2218 printk(KERN_WARNING "register_isdn: No write routine given.\n");
2219 return 0;
2220 }
2221 if (!(d = kzalloc(sizeof(isdn_driver_t), GFP_KERNEL))) {
2222 printk(KERN_WARNING "register_isdn: Could not alloc driver-struct\n");
2223 return 0;
2224 }
2225
2226 d->maxbufsize = i->maxbufsize;
2227 d->pktcount = 0;
2228 d->stavail = 0;
2229 d->flags = DRV_FLAG_LOADED;
2230 d->online = 0;
2231 d->interface = i;
2232 d->channels = 0;
2233 spin_lock_irqsave(&dev->lock, flags);
2234 for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
2235 if (!dev->drv[drvidx])
2236 break;
2237 if (isdn_add_channels(d, drvidx, i->channels, 0)) {
2238 spin_unlock_irqrestore(&dev->lock, flags);
2239 kfree(d);
2240 return 0;
2241 }
2242 i->channels = drvidx;
2243 i->rcvcallb_skb = isdn_receive_skb_callback;
2244 i->statcallb = isdn_status_callback;
2245 if (!strlen(i->id))
2246 sprintf(i->id, "line%d", drvidx);
2247 for (j = 0; j < drvidx; j++)
2248 if (!strcmp(i->id, dev->drvid[j]))
2249 sprintf(i->id, "line%d", drvidx);
2250 dev->drv[drvidx] = d;
2251 strcpy(dev->drvid[drvidx], i->id);
2252 isdn_info_update();
2253 dev->drivers++;
2254 set_global_features();
2255 spin_unlock_irqrestore(&dev->lock, flags);
2256 return 1;
2257 }
2258
2259 /*
2260 *****************************************************************************
2261 * And now the modules code.
2262 *****************************************************************************
2263 */
2264
2265 static char *
isdn_getrev(const char * revision)2266 isdn_getrev(const char *revision)
2267 {
2268 char *rev;
2269 char *p;
2270
2271 if ((p = strchr(revision, ':'))) {
2272 rev = p + 2;
2273 p = strchr(rev, '$');
2274 *--p = 0;
2275 } else
2276 rev = "???";
2277 return rev;
2278 }
2279
2280 /*
2281 * Allocate and initialize all data, register modem-devices
2282 */
isdn_init(void)2283 static int __init isdn_init(void)
2284 {
2285 int i;
2286 char tmprev[50];
2287
2288 dev = vzalloc(sizeof(isdn_dev));
2289 if (!dev) {
2290 printk(KERN_WARNING "isdn: Could not allocate device-struct.\n");
2291 return -EIO;
2292 }
2293 timer_setup(&dev->timer, isdn_timer_funct, 0);
2294 spin_lock_init(&dev->lock);
2295 spin_lock_init(&dev->timerlock);
2296 #ifdef MODULE
2297 dev->owner = THIS_MODULE;
2298 #endif
2299 mutex_init(&dev->mtx);
2300 init_waitqueue_head(&dev->info_waitq);
2301 for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
2302 dev->drvmap[i] = -1;
2303 dev->chanmap[i] = -1;
2304 dev->m_idx[i] = -1;
2305 strcpy(dev->num[i], "???");
2306 }
2307 if (register_chrdev(ISDN_MAJOR, "isdn", &isdn_fops)) {
2308 printk(KERN_WARNING "isdn: Could not register control devices\n");
2309 vfree(dev);
2310 return -EIO;
2311 }
2312 if ((isdn_tty_modem_init()) < 0) {
2313 printk(KERN_WARNING "isdn: Could not register tty devices\n");
2314 vfree(dev);
2315 unregister_chrdev(ISDN_MAJOR, "isdn");
2316 return -EIO;
2317 }
2318 #ifdef CONFIG_ISDN_PPP
2319 if (isdn_ppp_init() < 0) {
2320 printk(KERN_WARNING "isdn: Could not create PPP-device-structs\n");
2321 isdn_tty_exit();
2322 unregister_chrdev(ISDN_MAJOR, "isdn");
2323 vfree(dev);
2324 return -EIO;
2325 }
2326 #endif /* CONFIG_ISDN_PPP */
2327
2328 strcpy(tmprev, isdn_revision);
2329 printk(KERN_NOTICE "ISDN subsystem Rev: %s/", isdn_getrev(tmprev));
2330 strcpy(tmprev, isdn_net_revision);
2331 printk("%s/", isdn_getrev(tmprev));
2332 strcpy(tmprev, isdn_ppp_revision);
2333 printk("%s/", isdn_getrev(tmprev));
2334 strcpy(tmprev, isdn_audio_revision);
2335 printk("%s/", isdn_getrev(tmprev));
2336 strcpy(tmprev, isdn_v110_revision);
2337 printk("%s", isdn_getrev(tmprev));
2338
2339 #ifdef MODULE
2340 printk(" loaded\n");
2341 #else
2342 printk("\n");
2343 #endif
2344 isdn_info_update();
2345 return 0;
2346 }
2347
2348 /*
2349 * Unload module
2350 */
isdn_exit(void)2351 static void __exit isdn_exit(void)
2352 {
2353 #ifdef CONFIG_ISDN_PPP
2354 isdn_ppp_cleanup();
2355 #endif
2356 if (isdn_net_rmall() < 0) {
2357 printk(KERN_WARNING "isdn: net-device busy, remove cancelled\n");
2358 return;
2359 }
2360 isdn_tty_exit();
2361 unregister_chrdev(ISDN_MAJOR, "isdn");
2362 del_timer_sync(&dev->timer);
2363 /* call vfree with interrupts enabled, else it will hang */
2364 vfree(dev);
2365 printk(KERN_NOTICE "ISDN-subsystem unloaded\n");
2366 }
2367
2368 module_init(isdn_init);
2369 module_exit(isdn_exit);
2370