1 /* $Id: isdnloop.c,v 1.11.6.7 2001/11/11 19:54:31 kai Exp $
2 *
3 * ISDN low-level module implementing a dummy loop driver.
4 *
5 * Copyright 1997 by Fritz Elfert (fritz@isdn4linux.de)
6 *
7 * This software may be used and distributed according to the terms
8 * of the GNU General Public License, incorporated herein by reference.
9 *
10 */
11
12 #include <linux/module.h>
13 #include <linux/interrupt.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/sched.h>
17 #include "isdnloop.h"
18
19 static char *isdnloop_id = "loop0";
20
21 MODULE_DESCRIPTION("ISDN4Linux: Pseudo Driver that simulates an ISDN card");
22 MODULE_AUTHOR("Fritz Elfert");
23 MODULE_LICENSE("GPL");
24 module_param(isdnloop_id, charp, 0);
25 MODULE_PARM_DESC(isdnloop_id, "ID-String of first card");
26
27 static int isdnloop_addcard(char *);
28
29 /*
30 * Free queue completely.
31 *
32 * Parameter:
33 * card = pointer to card struct
34 * channel = channel number
35 */
36 static void
isdnloop_free_queue(isdnloop_card * card,int channel)37 isdnloop_free_queue(isdnloop_card *card, int channel)
38 {
39 struct sk_buff_head *queue = &card->bqueue[channel];
40
41 skb_queue_purge(queue);
42 card->sndcount[channel] = 0;
43 }
44
45 /*
46 * Send B-Channel data to another virtual card.
47 * This routine is called via timer-callback from isdnloop_pollbchan().
48 *
49 * Parameter:
50 * card = pointer to card struct.
51 * ch = channel number (0-based)
52 */
53 static void
isdnloop_bchan_send(isdnloop_card * card,int ch)54 isdnloop_bchan_send(isdnloop_card *card, int ch)
55 {
56 isdnloop_card *rcard = card->rcard[ch];
57 int rch = card->rch[ch], len, ack;
58 struct sk_buff *skb;
59 isdn_ctrl cmd;
60
61 while (card->sndcount[ch]) {
62 skb = skb_dequeue(&card->bqueue[ch]);
63 if (skb) {
64 len = skb->len;
65 card->sndcount[ch] -= len;
66 ack = *(skb->head); /* used as scratch area */
67 cmd.driver = card->myid;
68 cmd.arg = ch;
69 if (rcard) {
70 rcard->interface.rcvcallb_skb(rcard->myid, rch, skb);
71 } else {
72 printk(KERN_WARNING "isdnloop: no rcard, skb dropped\n");
73 dev_kfree_skb(skb);
74
75 };
76 cmd.command = ISDN_STAT_BSENT;
77 cmd.parm.length = len;
78 card->interface.statcallb(&cmd);
79 } else
80 card->sndcount[ch] = 0;
81 }
82 }
83
84 /*
85 * Send/Receive Data to/from the B-Channel.
86 * This routine is called via timer-callback.
87 * It schedules itself while any B-Channel is open.
88 *
89 * Parameter:
90 * data = pointer to card struct, set by kernel timer.data
91 */
92 static void
isdnloop_pollbchan(unsigned long data)93 isdnloop_pollbchan(unsigned long data)
94 {
95 isdnloop_card *card = (isdnloop_card *) data;
96 unsigned long flags;
97
98 if (card->flags & ISDNLOOP_FLAGS_B1ACTIVE)
99 isdnloop_bchan_send(card, 0);
100 if (card->flags & ISDNLOOP_FLAGS_B2ACTIVE)
101 isdnloop_bchan_send(card, 1);
102 if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE)) {
103 /* schedule b-channel polling again */
104 spin_lock_irqsave(&card->isdnloop_lock, flags);
105 card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
106 add_timer(&card->rb_timer);
107 card->flags |= ISDNLOOP_FLAGS_RBTIMER;
108 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
109 } else
110 card->flags &= ~ISDNLOOP_FLAGS_RBTIMER;
111 }
112
113 /*
114 * Parse ICN-type setup string and fill fields of setup-struct
115 * with parsed data.
116 *
117 * Parameter:
118 * setup = setup string, format: [caller-id],si1,si2,[called-id]
119 * cmd = pointer to struct to be filled.
120 */
121 static void
isdnloop_parse_setup(char * setup,isdn_ctrl * cmd)122 isdnloop_parse_setup(char *setup, isdn_ctrl *cmd)
123 {
124 char *t = setup;
125 char *s = strchr(t, ',');
126
127 *s++ = '\0';
128 strlcpy(cmd->parm.setup.phone, t, sizeof(cmd->parm.setup.phone));
129 s = strchr(t = s, ',');
130 *s++ = '\0';
131 if (!strlen(t))
132 cmd->parm.setup.si1 = 0;
133 else
134 cmd->parm.setup.si1 = simple_strtoul(t, NULL, 10);
135 s = strchr(t = s, ',');
136 *s++ = '\0';
137 if (!strlen(t))
138 cmd->parm.setup.si2 = 0;
139 else
140 cmd->parm.setup.si2 =
141 simple_strtoul(t, NULL, 10);
142 strlcpy(cmd->parm.setup.eazmsn, s, sizeof(cmd->parm.setup.eazmsn));
143 cmd->parm.setup.plan = 0;
144 cmd->parm.setup.screen = 0;
145 }
146
147 typedef struct isdnloop_stat {
148 char *statstr;
149 int command;
150 int action;
151 } isdnloop_stat;
152 /* *INDENT-OFF* */
153 static isdnloop_stat isdnloop_stat_table[] = {
154 {"BCON_", ISDN_STAT_BCONN, 1}, /* B-Channel connected */
155 {"BDIS_", ISDN_STAT_BHUP, 2}, /* B-Channel disconnected */
156 {"DCON_", ISDN_STAT_DCONN, 0}, /* D-Channel connected */
157 {"DDIS_", ISDN_STAT_DHUP, 0}, /* D-Channel disconnected */
158 {"DCAL_I", ISDN_STAT_ICALL, 3}, /* Incoming call dialup-line */
159 {"DSCA_I", ISDN_STAT_ICALL, 3}, /* Incoming call 1TR6-SPV */
160 {"FCALL", ISDN_STAT_ICALL, 4}, /* Leased line connection up */
161 {"CIF", ISDN_STAT_CINF, 5}, /* Charge-info, 1TR6-type */
162 {"AOC", ISDN_STAT_CINF, 6}, /* Charge-info, DSS1-type */
163 {"CAU", ISDN_STAT_CAUSE, 7}, /* Cause code */
164 {"TEI OK", ISDN_STAT_RUN, 0}, /* Card connected to wallplug */
165 {"E_L1: ACT FAIL", ISDN_STAT_BHUP, 8}, /* Layer-1 activation failed */
166 {"E_L2: DATA LIN", ISDN_STAT_BHUP, 8}, /* Layer-2 data link lost */
167 {"E_L1: ACTIVATION FAILED",
168 ISDN_STAT_BHUP, 8}, /* Layer-1 activation failed */
169 {NULL, 0, -1}
170 };
171 /* *INDENT-ON* */
172
173
174 /*
175 * Parse Status message-strings from virtual card.
176 * Depending on status, call statcallb for sending messages to upper
177 * levels. Also set/reset B-Channel active-flags.
178 *
179 * Parameter:
180 * status = status string to parse.
181 * channel = channel where message comes from.
182 * card = card where message comes from.
183 */
184 static void
isdnloop_parse_status(u_char * status,int channel,isdnloop_card * card)185 isdnloop_parse_status(u_char *status, int channel, isdnloop_card *card)
186 {
187 isdnloop_stat *s = isdnloop_stat_table;
188 int action = -1;
189 isdn_ctrl cmd;
190
191 while (s->statstr) {
192 if (!strncmp(status, s->statstr, strlen(s->statstr))) {
193 cmd.command = s->command;
194 action = s->action;
195 break;
196 }
197 s++;
198 }
199 if (action == -1)
200 return;
201 cmd.driver = card->myid;
202 cmd.arg = channel;
203 switch (action) {
204 case 1:
205 /* BCON_x */
206 card->flags |= (channel) ?
207 ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE;
208 break;
209 case 2:
210 /* BDIS_x */
211 card->flags &= ~((channel) ?
212 ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE);
213 isdnloop_free_queue(card, channel);
214 break;
215 case 3:
216 /* DCAL_I and DSCA_I */
217 isdnloop_parse_setup(status + 6, &cmd);
218 break;
219 case 4:
220 /* FCALL */
221 sprintf(cmd.parm.setup.phone, "LEASED%d", card->myid);
222 sprintf(cmd.parm.setup.eazmsn, "%d", channel + 1);
223 cmd.parm.setup.si1 = 7;
224 cmd.parm.setup.si2 = 0;
225 cmd.parm.setup.plan = 0;
226 cmd.parm.setup.screen = 0;
227 break;
228 case 5:
229 /* CIF */
230 strlcpy(cmd.parm.num, status + 3, sizeof(cmd.parm.num));
231 break;
232 case 6:
233 /* AOC */
234 snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%d",
235 (int) simple_strtoul(status + 7, NULL, 16));
236 break;
237 case 7:
238 /* CAU */
239 status += 3;
240 if (strlen(status) == 4)
241 snprintf(cmd.parm.num, sizeof(cmd.parm.num), "%s%c%c",
242 status + 2, *status, *(status + 1));
243 else
244 strlcpy(cmd.parm.num, status + 1, sizeof(cmd.parm.num));
245 break;
246 case 8:
247 /* Misc Errors on L1 and L2 */
248 card->flags &= ~ISDNLOOP_FLAGS_B1ACTIVE;
249 isdnloop_free_queue(card, 0);
250 cmd.arg = 0;
251 cmd.driver = card->myid;
252 card->interface.statcallb(&cmd);
253 cmd.command = ISDN_STAT_DHUP;
254 cmd.arg = 0;
255 cmd.driver = card->myid;
256 card->interface.statcallb(&cmd);
257 cmd.command = ISDN_STAT_BHUP;
258 card->flags &= ~ISDNLOOP_FLAGS_B2ACTIVE;
259 isdnloop_free_queue(card, 1);
260 cmd.arg = 1;
261 cmd.driver = card->myid;
262 card->interface.statcallb(&cmd);
263 cmd.command = ISDN_STAT_DHUP;
264 cmd.arg = 1;
265 cmd.driver = card->myid;
266 break;
267 }
268 card->interface.statcallb(&cmd);
269 }
270
271 /*
272 * Store a cwcharacter into ringbuffer for reading from /dev/isdnctrl
273 *
274 * Parameter:
275 * card = pointer to card struct.
276 * c = char to store.
277 */
278 static void
isdnloop_putmsg(isdnloop_card * card,unsigned char c)279 isdnloop_putmsg(isdnloop_card *card, unsigned char c)
280 {
281 ulong flags;
282
283 spin_lock_irqsave(&card->isdnloop_lock, flags);
284 *card->msg_buf_write++ = (c == 0xff) ? '\n' : c;
285 if (card->msg_buf_write == card->msg_buf_read) {
286 if (++card->msg_buf_read > card->msg_buf_end)
287 card->msg_buf_read = card->msg_buf;
288 }
289 if (card->msg_buf_write > card->msg_buf_end)
290 card->msg_buf_write = card->msg_buf;
291 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
292 }
293
294 /*
295 * Poll a virtual cards message queue.
296 * If there are new status-replies from the card, copy them to
297 * ringbuffer for reading on /dev/isdnctrl and call
298 * isdnloop_parse_status() for processing them. Watch for special
299 * Firmware bootmessage and parse it, to get the D-Channel protocol.
300 * If there are B-Channels open, initiate a timer-callback to
301 * isdnloop_pollbchan().
302 * This routine is called periodically via timer interrupt.
303 *
304 * Parameter:
305 * data = pointer to card struct
306 */
307 static void
isdnloop_polldchan(unsigned long data)308 isdnloop_polldchan(unsigned long data)
309 {
310 isdnloop_card *card = (isdnloop_card *) data;
311 struct sk_buff *skb;
312 int avail;
313 int left;
314 u_char c;
315 int ch;
316 unsigned long flags;
317 u_char *p;
318 isdn_ctrl cmd;
319
320 skb = skb_dequeue(&card->dqueue);
321 if (skb)
322 avail = skb->len;
323 else
324 avail = 0;
325 for (left = avail; left > 0; left--) {
326 c = *skb->data;
327 skb_pull(skb, 1);
328 isdnloop_putmsg(card, c);
329 card->imsg[card->iptr] = c;
330 if (card->iptr < 59)
331 card->iptr++;
332 if (!skb->len) {
333 avail++;
334 isdnloop_putmsg(card, '\n');
335 card->imsg[card->iptr] = 0;
336 card->iptr = 0;
337 if (card->imsg[0] == '0' && card->imsg[1] >= '0' &&
338 card->imsg[1] <= '2' && card->imsg[2] == ';') {
339 ch = (card->imsg[1] - '0') - 1;
340 p = &card->imsg[3];
341 isdnloop_parse_status(p, ch, card);
342 } else {
343 p = card->imsg;
344 if (!strncmp(p, "DRV1.", 5)) {
345 printk(KERN_INFO "isdnloop: (%s) %s\n", CID, p);
346 if (!strncmp(p + 7, "TC", 2)) {
347 card->ptype = ISDN_PTYPE_1TR6;
348 card->interface.features |= ISDN_FEATURE_P_1TR6;
349 printk(KERN_INFO
350 "isdnloop: (%s) 1TR6-Protocol loaded and running\n", CID);
351 }
352 if (!strncmp(p + 7, "EC", 2)) {
353 card->ptype = ISDN_PTYPE_EURO;
354 card->interface.features |= ISDN_FEATURE_P_EURO;
355 printk(KERN_INFO
356 "isdnloop: (%s) Euro-Protocol loaded and running\n", CID);
357 }
358 continue;
359
360 }
361 }
362 }
363 }
364 if (avail) {
365 cmd.command = ISDN_STAT_STAVAIL;
366 cmd.driver = card->myid;
367 cmd.arg = avail;
368 card->interface.statcallb(&cmd);
369 }
370 if (card->flags & (ISDNLOOP_FLAGS_B1ACTIVE | ISDNLOOP_FLAGS_B2ACTIVE))
371 if (!(card->flags & ISDNLOOP_FLAGS_RBTIMER)) {
372 /* schedule b-channel polling */
373 card->flags |= ISDNLOOP_FLAGS_RBTIMER;
374 spin_lock_irqsave(&card->isdnloop_lock, flags);
375 del_timer(&card->rb_timer);
376 card->rb_timer.function = isdnloop_pollbchan;
377 card->rb_timer.data = (unsigned long) card;
378 card->rb_timer.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
379 add_timer(&card->rb_timer);
380 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
381 }
382 /* schedule again */
383 spin_lock_irqsave(&card->isdnloop_lock, flags);
384 card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
385 add_timer(&card->st_timer);
386 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
387 }
388
389 /*
390 * Append a packet to the transmit buffer-queue.
391 *
392 * Parameter:
393 * channel = Number of B-channel
394 * skb = packet to send.
395 * card = pointer to card-struct
396 * Return:
397 * Number of bytes transferred, -E??? on error
398 */
399 static int
isdnloop_sendbuf(int channel,struct sk_buff * skb,isdnloop_card * card)400 isdnloop_sendbuf(int channel, struct sk_buff *skb, isdnloop_card *card)
401 {
402 int len = skb->len;
403 unsigned long flags;
404 struct sk_buff *nskb;
405
406 if (len > 4000) {
407 printk(KERN_WARNING
408 "isdnloop: Send packet too large\n");
409 return -EINVAL;
410 }
411 if (len) {
412 if (!(card->flags & (channel) ? ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE))
413 return 0;
414 if (card->sndcount[channel] > ISDNLOOP_MAX_SQUEUE)
415 return 0;
416 spin_lock_irqsave(&card->isdnloop_lock, flags);
417 nskb = dev_alloc_skb(skb->len);
418 if (nskb) {
419 skb_copy_from_linear_data(skb,
420 skb_put(nskb, len), len);
421 skb_queue_tail(&card->bqueue[channel], nskb);
422 dev_kfree_skb(skb);
423 } else
424 len = 0;
425 card->sndcount[channel] += len;
426 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
427 }
428 return len;
429 }
430
431 /*
432 * Read the messages from the card's ringbuffer
433 *
434 * Parameter:
435 * buf = pointer to buffer.
436 * len = number of bytes to read.
437 * user = flag, 1: called from userlevel 0: called from kernel.
438 * card = pointer to card struct.
439 * Return:
440 * number of bytes actually transferred.
441 */
442 static int
isdnloop_readstatus(u_char __user * buf,int len,isdnloop_card * card)443 isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card *card)
444 {
445 int count;
446 u_char __user *p;
447
448 for (p = buf, count = 0; count < len; p++, count++) {
449 if (card->msg_buf_read == card->msg_buf_write)
450 return count;
451 if (put_user(*card->msg_buf_read++, p))
452 return -EFAULT;
453 if (card->msg_buf_read > card->msg_buf_end)
454 card->msg_buf_read = card->msg_buf;
455 }
456 return count;
457 }
458
459 /*
460 * Simulate a card's response by appending it to the cards
461 * message queue.
462 *
463 * Parameter:
464 * card = pointer to card struct.
465 * s = pointer to message-string.
466 * ch = channel: 0 = generic messages, 1 and 2 = D-channel messages.
467 * Return:
468 * 0 on success, 1 on memory squeeze.
469 */
470 static int
isdnloop_fake(isdnloop_card * card,char * s,int ch)471 isdnloop_fake(isdnloop_card *card, char *s, int ch)
472 {
473 struct sk_buff *skb;
474 int len = strlen(s) + ((ch >= 0) ? 3 : 0);
475 skb = dev_alloc_skb(len);
476 if (!skb) {
477 printk(KERN_WARNING "isdnloop: Out of memory in isdnloop_fake\n");
478 return 1;
479 }
480 if (ch >= 0)
481 sprintf(skb_put(skb, 3), "%02d;", ch);
482 memcpy(skb_put(skb, strlen(s)), s, strlen(s));
483 skb_queue_tail(&card->dqueue, skb);
484 return 0;
485 }
486 /* *INDENT-OFF* */
487 static isdnloop_stat isdnloop_cmd_table[] = {
488 {"BCON_R", 0, 1}, /* B-Channel connect */
489 {"BCON_I", 0, 17}, /* B-Channel connect ind */
490 {"BDIS_R", 0, 2}, /* B-Channel disconnect */
491 {"DDIS_R", 0, 3}, /* D-Channel disconnect */
492 {"DCON_R", 0, 16}, /* D-Channel connect */
493 {"DSCA_R", 0, 4}, /* Dial 1TR6-SPV */
494 {"DCAL_R", 0, 5}, /* Dial */
495 {"EAZC", 0, 6}, /* Clear EAZ listener */
496 {"EAZ", 0, 7}, /* Set EAZ listener */
497 {"SEEAZ", 0, 8}, /* Get EAZ listener */
498 {"MSN", 0, 9}, /* Set/Clear MSN listener */
499 {"MSALL", 0, 10}, /* Set multi MSN listeners */
500 {"SETSIL", 0, 11}, /* Set SI list */
501 {"SEESIL", 0, 12}, /* Get SI list */
502 {"SILC", 0, 13}, /* Clear SI list */
503 {"LOCK", 0, -1}, /* LOCK channel */
504 {"UNLOCK", 0, -1}, /* UNLOCK channel */
505 {"FV2ON", 1, 14}, /* Leased mode on */
506 {"FV2OFF", 1, 15}, /* Leased mode off */
507 {NULL, 0, -1}
508 };
509 /* *INDENT-ON* */
510
511
512 /*
513 * Simulate an error-response from a card.
514 *
515 * Parameter:
516 * card = pointer to card struct.
517 */
518 static void
isdnloop_fake_err(isdnloop_card * card)519 isdnloop_fake_err(isdnloop_card *card)
520 {
521 char buf[64];
522
523 snprintf(buf, sizeof(buf), "E%s", card->omsg);
524 isdnloop_fake(card, buf, -1);
525 isdnloop_fake(card, "NAK", -1);
526 }
527
528 static u_char ctable_eu[] = {0x00, 0x11, 0x01, 0x12};
529 static u_char ctable_1t[] = {0x00, 0x3b, 0x01, 0x3a};
530
531 /*
532 * Assemble a simplified cause message depending on the
533 * D-channel protocol used.
534 *
535 * Parameter:
536 * card = pointer to card struct.
537 * loc = location: 0 = local, 1 = remote.
538 * cau = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
539 * Return:
540 * Pointer to buffer containing the assembled message.
541 */
542 static char *
isdnloop_unicause(isdnloop_card * card,int loc,int cau)543 isdnloop_unicause(isdnloop_card *card, int loc, int cau)
544 {
545 static char buf[6];
546
547 switch (card->ptype) {
548 case ISDN_PTYPE_EURO:
549 sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
550 break;
551 case ISDN_PTYPE_1TR6:
552 sprintf(buf, "%02X44", ctable_1t[cau]);
553 break;
554 default:
555 return "0000";
556 }
557 return buf;
558 }
559
560 /*
561 * Release a virtual connection. Called from timer interrupt, when
562 * called party did not respond.
563 *
564 * Parameter:
565 * card = pointer to card struct.
566 * ch = channel (0-based)
567 */
568 static void
isdnloop_atimeout(isdnloop_card * card,int ch)569 isdnloop_atimeout(isdnloop_card *card, int ch)
570 {
571 unsigned long flags;
572 char buf[60];
573
574 spin_lock_irqsave(&card->isdnloop_lock, flags);
575 if (card->rcard) {
576 isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
577 card->rcard[ch]->rcard[card->rch[ch]] = NULL;
578 card->rcard[ch] = NULL;
579 }
580 isdnloop_fake(card, "DDIS_I", ch + 1);
581 /* No user responding */
582 sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
583 isdnloop_fake(card, buf, ch + 1);
584 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
585 }
586
587 /*
588 * Wrapper for isdnloop_atimeout().
589 */
590 static void
isdnloop_atimeout0(unsigned long data)591 isdnloop_atimeout0(unsigned long data)
592 {
593 isdnloop_card *card = (isdnloop_card *) data;
594 isdnloop_atimeout(card, 0);
595 }
596
597 /*
598 * Wrapper for isdnloop_atimeout().
599 */
600 static void
isdnloop_atimeout1(unsigned long data)601 isdnloop_atimeout1(unsigned long data)
602 {
603 isdnloop_card *card = (isdnloop_card *) data;
604 isdnloop_atimeout(card, 1);
605 }
606
607 /*
608 * Install a watchdog for a user, not responding.
609 *
610 * Parameter:
611 * card = pointer to card struct.
612 * ch = channel to watch for.
613 */
614 static void
isdnloop_start_ctimer(isdnloop_card * card,int ch)615 isdnloop_start_ctimer(isdnloop_card *card, int ch)
616 {
617 unsigned long flags;
618
619 spin_lock_irqsave(&card->isdnloop_lock, flags);
620 init_timer(&card->c_timer[ch]);
621 card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
622 if (ch)
623 card->c_timer[ch].function = isdnloop_atimeout1;
624 else
625 card->c_timer[ch].function = isdnloop_atimeout0;
626 card->c_timer[ch].data = (unsigned long) card;
627 add_timer(&card->c_timer[ch]);
628 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
629 }
630
631 /*
632 * Kill a pending channel watchdog.
633 *
634 * Parameter:
635 * card = pointer to card struct.
636 * ch = channel (0-based).
637 */
638 static void
isdnloop_kill_ctimer(isdnloop_card * card,int ch)639 isdnloop_kill_ctimer(isdnloop_card *card, int ch)
640 {
641 unsigned long flags;
642
643 spin_lock_irqsave(&card->isdnloop_lock, flags);
644 del_timer(&card->c_timer[ch]);
645 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
646 }
647
648 static u_char si2bit[] = {0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
649 static u_char bit2si[] = {1, 5, 7};
650
651 /*
652 * Try finding a listener for an outgoing call.
653 *
654 * Parameter:
655 * card = pointer to calling card.
656 * p = pointer to ICN-type setup-string.
657 * lch = channel of calling card.
658 * cmd = pointer to struct to be filled when parsing setup.
659 * Return:
660 * 0 = found match, alerting should happen.
661 * 1 = found matching number but it is busy.
662 * 2 = no matching listener.
663 * 3 = found matching number but SI does not match.
664 */
665 static int
isdnloop_try_call(isdnloop_card * card,char * p,int lch,isdn_ctrl * cmd)666 isdnloop_try_call(isdnloop_card *card, char *p, int lch, isdn_ctrl *cmd)
667 {
668 isdnloop_card *cc = cards;
669 unsigned long flags;
670 int ch;
671 int num_match;
672 int i;
673 char *e;
674 char nbuf[32];
675
676 isdnloop_parse_setup(p, cmd);
677 while (cc) {
678 for (ch = 0; ch < 2; ch++) {
679 /* Exclude ourself */
680 if ((cc == card) && (ch == lch))
681 continue;
682 num_match = 0;
683 switch (cc->ptype) {
684 case ISDN_PTYPE_EURO:
685 for (i = 0; i < 3; i++)
686 if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
687 num_match = 1;
688 break;
689 case ISDN_PTYPE_1TR6:
690 e = cc->eazlist[ch];
691 while (*e) {
692 sprintf(nbuf, "%s%c", cc->s0num[0], *e);
693 if (!(strcmp(nbuf, cmd->parm.setup.phone)))
694 num_match = 1;
695 e++;
696 }
697 }
698 if (num_match) {
699 spin_lock_irqsave(&card->isdnloop_lock, flags);
700 /* channel idle? */
701 if (!(cc->rcard[ch])) {
702 /* Check SI */
703 if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
704 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
705 return 3;
706 }
707 /* ch is idle, si and number matches */
708 cc->rcard[ch] = card;
709 cc->rch[ch] = lch;
710 card->rcard[lch] = cc;
711 card->rch[lch] = ch;
712 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
713 return 0;
714 } else {
715 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
716 /* num matches, but busy */
717 if (ch == 1)
718 return 1;
719 }
720 }
721 }
722 cc = cc->next;
723 }
724 return 2;
725 }
726
727 /*
728 * Depending on D-channel protocol and caller/called, modify
729 * phone number.
730 *
731 * Parameter:
732 * card = pointer to card struct.
733 * phone = pointer phone number.
734 * caller = flag: 1 = caller, 0 = called.
735 * Return:
736 * pointer to new phone number.
737 */
738 static char *
isdnloop_vstphone(isdnloop_card * card,char * phone,int caller)739 isdnloop_vstphone(isdnloop_card *card, char *phone, int caller)
740 {
741 int i;
742 static char nphone[30];
743
744 if (!card) {
745 printk("BUG!!!\n");
746 return "";
747 }
748 switch (card->ptype) {
749 case ISDN_PTYPE_EURO:
750 if (caller) {
751 for (i = 0; i < 2; i++)
752 if (!(strcmp(card->s0num[i], phone)))
753 return phone;
754 return card->s0num[0];
755 }
756 return phone;
757 break;
758 case ISDN_PTYPE_1TR6:
759 if (caller) {
760 sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
761 return nphone;
762 } else
763 return &phone[strlen(phone) - 1];
764 break;
765 }
766 return "";
767 }
768
769 /*
770 * Parse an ICN-type command string sent to the 'card'.
771 * Perform misc. actions depending on the command.
772 *
773 * Parameter:
774 * card = pointer to card struct.
775 */
776 static void
isdnloop_parse_cmd(isdnloop_card * card)777 isdnloop_parse_cmd(isdnloop_card *card)
778 {
779 char *p = card->omsg;
780 isdn_ctrl cmd;
781 char buf[60];
782 isdnloop_stat *s = isdnloop_cmd_table;
783 int action = -1;
784 int i;
785 int ch;
786
787 if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
788 isdnloop_fake_err(card);
789 return;
790 }
791 ch = card->omsg[1] - '0';
792 if ((ch < 0) || (ch > 2)) {
793 isdnloop_fake_err(card);
794 return;
795 }
796 p += 3;
797 while (s->statstr) {
798 if (!strncmp(p, s->statstr, strlen(s->statstr))) {
799 action = s->action;
800 if (s->command && (ch != 0)) {
801 isdnloop_fake_err(card);
802 return;
803 }
804 break;
805 }
806 s++;
807 }
808 if (action == -1)
809 return;
810 switch (action) {
811 case 1:
812 /* 0x;BCON_R */
813 if (card->rcard[ch - 1]) {
814 isdnloop_fake(card->rcard[ch - 1], "BCON_I",
815 card->rch[ch - 1] + 1);
816 isdnloop_fake(card, "BCON_C", ch);
817 }
818 break;
819 case 17:
820 /* 0x;BCON_I */
821 if (card->rcard[ch - 1]) {
822 isdnloop_fake(card->rcard[ch - 1], "BCON_C",
823 card->rch[ch - 1] + 1);
824 }
825 break;
826 case 2:
827 /* 0x;BDIS_R */
828 isdnloop_fake(card, "BDIS_C", ch);
829 if (card->rcard[ch - 1]) {
830 isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
831 card->rch[ch - 1] + 1);
832 }
833 break;
834 case 16:
835 /* 0x;DCON_R */
836 isdnloop_kill_ctimer(card, ch - 1);
837 if (card->rcard[ch - 1]) {
838 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
839 isdnloop_fake(card->rcard[ch - 1], "DCON_C",
840 card->rch[ch - 1] + 1);
841 isdnloop_fake(card, "DCON_C", ch);
842 }
843 break;
844 case 3:
845 /* 0x;DDIS_R */
846 isdnloop_kill_ctimer(card, ch - 1);
847 if (card->rcard[ch - 1]) {
848 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
849 isdnloop_fake(card->rcard[ch - 1], "DDIS_I",
850 card->rch[ch - 1] + 1);
851 card->rcard[ch - 1] = NULL;
852 }
853 isdnloop_fake(card, "DDIS_C", ch);
854 break;
855 case 4:
856 /* 0x;DSCA_Rdd,yy,zz,oo */
857 if (card->ptype != ISDN_PTYPE_1TR6) {
858 isdnloop_fake_err(card);
859 return;
860 }
861 /* Fall through */
862 case 5:
863 /* 0x;DCAL_Rdd,yy,zz,oo */
864 p += 6;
865 switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
866 case 0:
867 /* Alerting */
868 sprintf(buf, "D%s_I%s,%02d,%02d,%s",
869 (action == 4) ? "SCA" : "CAL",
870 isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
871 cmd.parm.setup.si1,
872 cmd.parm.setup.si2,
873 isdnloop_vstphone(card->rcard[ch - 1],
874 cmd.parm.setup.phone, 0));
875 isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
876 /* Fall through */
877 case 3:
878 /* si1 does not match, don't alert but start timer */
879 isdnloop_start_ctimer(card, ch - 1);
880 break;
881 case 1:
882 /* Remote busy */
883 isdnloop_fake(card, "DDIS_I", ch);
884 sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
885 isdnloop_fake(card, buf, ch);
886 break;
887 case 2:
888 /* No such user */
889 isdnloop_fake(card, "DDIS_I", ch);
890 sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
891 isdnloop_fake(card, buf, ch);
892 break;
893 }
894 break;
895 case 6:
896 /* 0x;EAZC */
897 card->eazlist[ch - 1][0] = '\0';
898 break;
899 case 7:
900 /* 0x;EAZ */
901 p += 3;
902 if (strlen(p) >= sizeof(card->eazlist[0]))
903 break;
904 strcpy(card->eazlist[ch - 1], p);
905 break;
906 case 8:
907 /* 0x;SEEAZ */
908 sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
909 isdnloop_fake(card, buf, ch + 1);
910 break;
911 case 9:
912 /* 0x;MSN */
913 break;
914 case 10:
915 /* 0x;MSNALL */
916 break;
917 case 11:
918 /* 0x;SETSIL */
919 p += 6;
920 i = 0;
921 while (strchr("0157", *p)) {
922 if (i)
923 card->sil[ch - 1] |= si2bit[*p - '0'];
924 i = (*p++ == '0');
925 }
926 if (*p)
927 isdnloop_fake_err(card);
928 break;
929 case 12:
930 /* 0x;SEESIL */
931 sprintf(buf, "SIN-LIST: ");
932 p = buf + 10;
933 for (i = 0; i < 3; i++)
934 if (card->sil[ch - 1] & (1 << i))
935 p += sprintf(p, "%02d", bit2si[i]);
936 isdnloop_fake(card, buf, ch + 1);
937 break;
938 case 13:
939 /* 0x;SILC */
940 card->sil[ch - 1] = 0;
941 break;
942 case 14:
943 /* 00;FV2ON */
944 break;
945 case 15:
946 /* 00;FV2OFF */
947 break;
948 }
949 }
950
951 /*
952 * Put command-strings into the of the 'card'. In reality, execute them
953 * right in place by calling isdnloop_parse_cmd(). Also copy every
954 * command to the read message ringbuffer, preceding it with a '>'.
955 * These mesagges can be read at /dev/isdnctrl.
956 *
957 * Parameter:
958 * buf = pointer to command buffer.
959 * len = length of buffer data.
960 * user = flag: 1 = called form userlevel, 0 called from kernel.
961 * card = pointer to card struct.
962 * Return:
963 * number of bytes transferred (currently always equals len).
964 */
965 static int
isdnloop_writecmd(const u_char * buf,int len,int user,isdnloop_card * card)966 isdnloop_writecmd(const u_char *buf, int len, int user, isdnloop_card *card)
967 {
968 int xcount = 0;
969 int ocount = 1;
970 isdn_ctrl cmd;
971
972 while (len) {
973 int count = len;
974 u_char *p;
975 u_char msg[0x100];
976
977 if (count > 255)
978 count = 255;
979 if (user) {
980 if (copy_from_user(msg, buf, count))
981 return -EFAULT;
982 } else
983 memcpy(msg, buf, count);
984 isdnloop_putmsg(card, '>');
985 for (p = msg; count > 0; count--, p++) {
986 len--;
987 xcount++;
988 isdnloop_putmsg(card, *p);
989 card->omsg[card->optr] = *p;
990 if (*p == '\n') {
991 card->omsg[card->optr] = '\0';
992 card->optr = 0;
993 isdnloop_parse_cmd(card);
994 if (len) {
995 isdnloop_putmsg(card, '>');
996 ocount++;
997 }
998 } else {
999 if (card->optr < 59)
1000 card->optr++;
1001 }
1002 ocount++;
1003 }
1004 }
1005 cmd.command = ISDN_STAT_STAVAIL;
1006 cmd.driver = card->myid;
1007 cmd.arg = ocount;
1008 card->interface.statcallb(&cmd);
1009 return xcount;
1010 }
1011
1012 /*
1013 * Delete card's pending timers, send STOP to linklevel
1014 */
1015 static void
isdnloop_stopcard(isdnloop_card * card)1016 isdnloop_stopcard(isdnloop_card *card)
1017 {
1018 unsigned long flags;
1019 isdn_ctrl cmd;
1020
1021 spin_lock_irqsave(&card->isdnloop_lock, flags);
1022 if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
1023 card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
1024 del_timer(&card->st_timer);
1025 del_timer(&card->rb_timer);
1026 del_timer(&card->c_timer[0]);
1027 del_timer(&card->c_timer[1]);
1028 cmd.command = ISDN_STAT_STOP;
1029 cmd.driver = card->myid;
1030 card->interface.statcallb(&cmd);
1031 }
1032 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1033 }
1034
1035 /*
1036 * Stop all cards before unload.
1037 */
1038 static void
isdnloop_stopallcards(void)1039 isdnloop_stopallcards(void)
1040 {
1041 isdnloop_card *p = cards;
1042
1043 while (p) {
1044 isdnloop_stopcard(p);
1045 p = p->next;
1046 }
1047 }
1048
1049 /*
1050 * Start a 'card'. Simulate card's boot message and set the phone
1051 * number(s) of the virtual 'S0-Interface'. Install D-channel
1052 * poll timer.
1053 *
1054 * Parameter:
1055 * card = pointer to card struct.
1056 * sdefp = pointer to struct holding ioctl parameters.
1057 * Return:
1058 * 0 on success, -E??? otherwise.
1059 */
1060 static int
isdnloop_start(isdnloop_card * card,isdnloop_sdef * sdefp)1061 isdnloop_start(isdnloop_card *card, isdnloop_sdef *sdefp)
1062 {
1063 unsigned long flags;
1064 isdnloop_sdef sdef;
1065 int i;
1066
1067 if (card->flags & ISDNLOOP_FLAGS_RUNNING)
1068 return -EBUSY;
1069 if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
1070 return -EFAULT;
1071
1072 for (i = 0; i < 3; i++) {
1073 if (!memchr(sdef.num[i], 0, sizeof(sdef.num[i])))
1074 return -EINVAL;
1075 }
1076
1077 spin_lock_irqsave(&card->isdnloop_lock, flags);
1078 switch (sdef.ptype) {
1079 case ISDN_PTYPE_EURO:
1080 if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
1081 -1)) {
1082 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1083 return -ENOMEM;
1084 }
1085 card->sil[0] = card->sil[1] = 4;
1086 if (isdnloop_fake(card, "TEI OK", 0)) {
1087 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1088 return -ENOMEM;
1089 }
1090 for (i = 0; i < 3; i++) {
1091 strlcpy(card->s0num[i], sdef.num[i],
1092 sizeof(card->s0num[0]));
1093 }
1094 break;
1095 case ISDN_PTYPE_1TR6:
1096 if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
1097 -1)) {
1098 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1099 return -ENOMEM;
1100 }
1101 card->sil[0] = card->sil[1] = 4;
1102 if (isdnloop_fake(card, "TEI OK", 0)) {
1103 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1104 return -ENOMEM;
1105 }
1106 strlcpy(card->s0num[0], sdef.num[0], sizeof(card->s0num[0]));
1107 card->s0num[1][0] = '\0';
1108 card->s0num[2][0] = '\0';
1109 break;
1110 default:
1111 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1112 printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
1113 sdef.ptype);
1114 return -EINVAL;
1115 }
1116 init_timer(&card->st_timer);
1117 card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
1118 card->st_timer.function = isdnloop_polldchan;
1119 card->st_timer.data = (unsigned long) card;
1120 add_timer(&card->st_timer);
1121 card->flags |= ISDNLOOP_FLAGS_RUNNING;
1122 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1123 return 0;
1124 }
1125
1126 /*
1127 * Main handler for commands sent by linklevel.
1128 */
1129 static int
isdnloop_command(isdn_ctrl * c,isdnloop_card * card)1130 isdnloop_command(isdn_ctrl *c, isdnloop_card *card)
1131 {
1132 ulong a;
1133 int i;
1134 char cbuf[80];
1135 isdn_ctrl cmd;
1136 isdnloop_cdef cdef;
1137
1138 switch (c->command) {
1139 case ISDN_CMD_IOCTL:
1140 memcpy(&a, c->parm.num, sizeof(ulong));
1141 switch (c->arg) {
1142 case ISDNLOOP_IOCTL_DEBUGVAR:
1143 return (ulong) card;
1144 case ISDNLOOP_IOCTL_STARTUP:
1145 if (!access_ok(VERIFY_READ, (void *) a, sizeof(isdnloop_sdef)))
1146 return -EFAULT;
1147 return isdnloop_start(card, (isdnloop_sdef *) a);
1148 break;
1149 case ISDNLOOP_IOCTL_ADDCARD:
1150 if (copy_from_user((char *)&cdef,
1151 (char *)a,
1152 sizeof(cdef)))
1153 return -EFAULT;
1154 return isdnloop_addcard(cdef.id1);
1155 break;
1156 case ISDNLOOP_IOCTL_LEASEDCFG:
1157 if (a) {
1158 if (!card->leased) {
1159 card->leased = 1;
1160 while (card->ptype == ISDN_PTYPE_UNKNOWN)
1161 schedule_timeout_interruptible(10);
1162 schedule_timeout_interruptible(10);
1163 sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
1164 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1165 printk(KERN_INFO
1166 "isdnloop: (%s) Leased-line mode enabled\n",
1167 CID);
1168 cmd.command = ISDN_STAT_RUN;
1169 cmd.driver = card->myid;
1170 cmd.arg = 0;
1171 card->interface.statcallb(&cmd);
1172 }
1173 } else {
1174 if (card->leased) {
1175 card->leased = 0;
1176 sprintf(cbuf, "00;FV2OFF\n");
1177 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1178 printk(KERN_INFO
1179 "isdnloop: (%s) Leased-line mode disabled\n",
1180 CID);
1181 cmd.command = ISDN_STAT_RUN;
1182 cmd.driver = card->myid;
1183 cmd.arg = 0;
1184 card->interface.statcallb(&cmd);
1185 }
1186 }
1187 return 0;
1188 default:
1189 return -EINVAL;
1190 }
1191 break;
1192 case ISDN_CMD_DIAL:
1193 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1194 return -ENODEV;
1195 if (card->leased)
1196 break;
1197 if ((c->arg & 255) < ISDNLOOP_BCH) {
1198 char *p;
1199 char dcode[4];
1200
1201 a = c->arg;
1202 p = c->parm.setup.phone;
1203 if (*p == 's' || *p == 'S') {
1204 /* Dial for SPV */
1205 p++;
1206 strcpy(dcode, "SCA");
1207 } else
1208 /* Normal Dial */
1209 strcpy(dcode, "CAL");
1210 snprintf(cbuf, sizeof(cbuf),
1211 "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
1212 dcode, p, c->parm.setup.si1,
1213 c->parm.setup.si2, c->parm.setup.eazmsn);
1214 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1215 }
1216 break;
1217 case ISDN_CMD_ACCEPTD:
1218 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1219 return -ENODEV;
1220 if (c->arg < ISDNLOOP_BCH) {
1221 a = c->arg + 1;
1222 cbuf[0] = 0;
1223 switch (card->l2_proto[a - 1]) {
1224 case ISDN_PROTO_L2_X75I:
1225 sprintf(cbuf, "%02d;BX75\n", (int) a);
1226 break;
1227 #ifdef CONFIG_ISDN_X25
1228 case ISDN_PROTO_L2_X25DTE:
1229 sprintf(cbuf, "%02d;BX2T\n", (int) a);
1230 break;
1231 case ISDN_PROTO_L2_X25DCE:
1232 sprintf(cbuf, "%02d;BX2C\n", (int) a);
1233 break;
1234 #endif
1235 case ISDN_PROTO_L2_HDLC:
1236 sprintf(cbuf, "%02d;BTRA\n", (int) a);
1237 break;
1238 }
1239 if (strlen(cbuf))
1240 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1241 sprintf(cbuf, "%02d;DCON_R\n", (int) a);
1242 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1243 }
1244 break;
1245 case ISDN_CMD_ACCEPTB:
1246 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1247 return -ENODEV;
1248 if (c->arg < ISDNLOOP_BCH) {
1249 a = c->arg + 1;
1250 switch (card->l2_proto[a - 1]) {
1251 case ISDN_PROTO_L2_X75I:
1252 sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
1253 break;
1254 #ifdef CONFIG_ISDN_X25
1255 case ISDN_PROTO_L2_X25DTE:
1256 sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
1257 break;
1258 case ISDN_PROTO_L2_X25DCE:
1259 sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
1260 break;
1261 #endif
1262 case ISDN_PROTO_L2_HDLC:
1263 sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
1264 break;
1265 default:
1266 sprintf(cbuf, "%02d;BCON_R\n", (int) a);
1267 }
1268 printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
1269 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1270 break;
1271 case ISDN_CMD_HANGUP:
1272 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1273 return -ENODEV;
1274 if (c->arg < ISDNLOOP_BCH) {
1275 a = c->arg + 1;
1276 sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
1277 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1278 }
1279 break;
1280 case ISDN_CMD_SETEAZ:
1281 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1282 return -ENODEV;
1283 if (card->leased)
1284 break;
1285 if (c->arg < ISDNLOOP_BCH) {
1286 a = c->arg + 1;
1287 if (card->ptype == ISDN_PTYPE_EURO) {
1288 sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
1289 c->parm.num[0] ? "N" : "ALL", c->parm.num);
1290 } else
1291 sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
1292 c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
1293 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1294 }
1295 break;
1296 case ISDN_CMD_CLREAZ:
1297 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1298 return -ENODEV;
1299 if (card->leased)
1300 break;
1301 if (c->arg < ISDNLOOP_BCH) {
1302 a = c->arg + 1;
1303 if (card->ptype == ISDN_PTYPE_EURO)
1304 sprintf(cbuf, "%02d;MSNC\n", (int) a);
1305 else
1306 sprintf(cbuf, "%02d;EAZC\n", (int) a);
1307 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1308 }
1309 break;
1310 case ISDN_CMD_SETL2:
1311 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1312 return -ENODEV;
1313 if ((c->arg & 255) < ISDNLOOP_BCH) {
1314 a = c->arg;
1315 switch (a >> 8) {
1316 case ISDN_PROTO_L2_X75I:
1317 sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
1318 break;
1319 #ifdef CONFIG_ISDN_X25
1320 case ISDN_PROTO_L2_X25DTE:
1321 sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
1322 break;
1323 case ISDN_PROTO_L2_X25DCE:
1324 sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
1325 break;
1326 #endif
1327 case ISDN_PROTO_L2_HDLC:
1328 sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1329 break;
1330 case ISDN_PROTO_L2_TRANS:
1331 sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1332 break;
1333 default:
1334 return -EINVAL;
1335 }
1336 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1337 card->l2_proto[a & 255] = (a >> 8);
1338 }
1339 break;
1340 case ISDN_CMD_SETL3:
1341 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1342 return -ENODEV;
1343 return 0;
1344 default:
1345 return -EINVAL;
1346 }
1347 }
1348 return 0;
1349 }
1350
1351 /*
1352 * Find card with given driverId
1353 */
1354 static inline isdnloop_card *
isdnloop_findcard(int driverid)1355 isdnloop_findcard(int driverid)
1356 {
1357 isdnloop_card *p = cards;
1358
1359 while (p) {
1360 if (p->myid == driverid)
1361 return p;
1362 p = p->next;
1363 }
1364 return (isdnloop_card *) 0;
1365 }
1366
1367 /*
1368 * Wrapper functions for interface to linklevel
1369 */
1370 static int
if_command(isdn_ctrl * c)1371 if_command(isdn_ctrl *c)
1372 {
1373 isdnloop_card *card = isdnloop_findcard(c->driver);
1374
1375 if (card)
1376 return isdnloop_command(c, card);
1377 printk(KERN_ERR
1378 "isdnloop: if_command called with invalid driverId!\n");
1379 return -ENODEV;
1380 }
1381
1382 static int
if_writecmd(const u_char __user * buf,int len,int id,int channel)1383 if_writecmd(const u_char __user *buf, int len, int id, int channel)
1384 {
1385 isdnloop_card *card = isdnloop_findcard(id);
1386
1387 if (card) {
1388 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1389 return -ENODEV;
1390 return isdnloop_writecmd(buf, len, 1, card);
1391 }
1392 printk(KERN_ERR
1393 "isdnloop: if_writecmd called with invalid driverId!\n");
1394 return -ENODEV;
1395 }
1396
1397 static int
if_readstatus(u_char __user * buf,int len,int id,int channel)1398 if_readstatus(u_char __user *buf, int len, int id, int channel)
1399 {
1400 isdnloop_card *card = isdnloop_findcard(id);
1401
1402 if (card) {
1403 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1404 return -ENODEV;
1405 return isdnloop_readstatus(buf, len, card);
1406 }
1407 printk(KERN_ERR
1408 "isdnloop: if_readstatus called with invalid driverId!\n");
1409 return -ENODEV;
1410 }
1411
1412 static int
if_sendbuf(int id,int channel,int ack,struct sk_buff * skb)1413 if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
1414 {
1415 isdnloop_card *card = isdnloop_findcard(id);
1416
1417 if (card) {
1418 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1419 return -ENODEV;
1420 /* ack request stored in skb scratch area */
1421 *(skb->head) = ack;
1422 return isdnloop_sendbuf(channel, skb, card);
1423 }
1424 printk(KERN_ERR
1425 "isdnloop: if_sendbuf called with invalid driverId!\n");
1426 return -ENODEV;
1427 }
1428
1429 /*
1430 * Allocate a new card-struct, initialize it
1431 * link it into cards-list and register it at linklevel.
1432 */
1433 static isdnloop_card *
isdnloop_initcard(char * id)1434 isdnloop_initcard(char *id)
1435 {
1436 isdnloop_card *card;
1437 int i;
1438 card = kzalloc(sizeof(isdnloop_card), GFP_KERNEL);
1439 if (!card) {
1440 printk(KERN_WARNING
1441 "isdnloop: (%s) Could not allocate card-struct.\n", id);
1442 return (isdnloop_card *) 0;
1443 }
1444 card->interface.owner = THIS_MODULE;
1445 card->interface.channels = ISDNLOOP_BCH;
1446 card->interface.hl_hdrlen = 1; /* scratch area for storing ack flag*/
1447 card->interface.maxbufsize = 4000;
1448 card->interface.command = if_command;
1449 card->interface.writebuf_skb = if_sendbuf;
1450 card->interface.writecmd = if_writecmd;
1451 card->interface.readstat = if_readstatus;
1452 card->interface.features = ISDN_FEATURE_L2_X75I |
1453 #ifdef CONFIG_ISDN_X25
1454 ISDN_FEATURE_L2_X25DTE |
1455 ISDN_FEATURE_L2_X25DCE |
1456 #endif
1457 ISDN_FEATURE_L2_HDLC |
1458 ISDN_FEATURE_L3_TRANS |
1459 ISDN_FEATURE_P_UNKNOWN;
1460 card->ptype = ISDN_PTYPE_UNKNOWN;
1461 strlcpy(card->interface.id, id, sizeof(card->interface.id));
1462 card->msg_buf_write = card->msg_buf;
1463 card->msg_buf_read = card->msg_buf;
1464 card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
1465 for (i = 0; i < ISDNLOOP_BCH; i++) {
1466 card->l2_proto[i] = ISDN_PROTO_L2_X75I;
1467 skb_queue_head_init(&card->bqueue[i]);
1468 }
1469 skb_queue_head_init(&card->dqueue);
1470 spin_lock_init(&card->isdnloop_lock);
1471 card->next = cards;
1472 cards = card;
1473 if (!register_isdn(&card->interface)) {
1474 cards = cards->next;
1475 printk(KERN_WARNING
1476 "isdnloop: Unable to register %s\n", id);
1477 kfree(card);
1478 return (isdnloop_card *) 0;
1479 }
1480 card->myid = card->interface.channels;
1481 return card;
1482 }
1483
1484 static int
isdnloop_addcard(char * id1)1485 isdnloop_addcard(char *id1)
1486 {
1487 isdnloop_card *card;
1488 card = isdnloop_initcard(id1);
1489 if (!card) {
1490 return -EIO;
1491 }
1492 printk(KERN_INFO
1493 "isdnloop: (%s) virtual card added\n",
1494 card->interface.id);
1495 return 0;
1496 }
1497
1498 static int __init
isdnloop_init(void)1499 isdnloop_init(void)
1500 {
1501 if (isdnloop_id)
1502 return isdnloop_addcard(isdnloop_id);
1503
1504 return 0;
1505 }
1506
1507 static void __exit
isdnloop_exit(void)1508 isdnloop_exit(void)
1509 {
1510 isdn_ctrl cmd;
1511 isdnloop_card *card = cards;
1512 isdnloop_card *last;
1513 int i;
1514
1515 isdnloop_stopallcards();
1516 while (card) {
1517 cmd.command = ISDN_STAT_UNLOAD;
1518 cmd.driver = card->myid;
1519 card->interface.statcallb(&cmd);
1520 for (i = 0; i < ISDNLOOP_BCH; i++)
1521 isdnloop_free_queue(card, i);
1522 card = card->next;
1523 }
1524 card = cards;
1525 while (card) {
1526 last = card;
1527 skb_queue_purge(&card->dqueue);
1528 card = card->next;
1529 kfree(last);
1530 }
1531 printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
1532 }
1533
1534 module_init(isdnloop_init);
1535 module_exit(isdnloop_exit);
1536