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(struct timer_list * t)93 isdnloop_pollbchan(struct timer_list *t)
94 {
95 isdnloop_card *card = from_timer(card, t, rb_timer);
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(struct timer_list * t)308 isdnloop_polldchan(struct timer_list *t)
309 {
310 isdnloop_card *card = from_timer(card, t, st_timer);
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.expires = jiffies + ISDNLOOP_TIMER_BCREAD;
377 add_timer(&card->rb_timer);
378 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
379 }
380 /* schedule again */
381 spin_lock_irqsave(&card->isdnloop_lock, flags);
382 card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
383 add_timer(&card->st_timer);
384 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
385 }
386
387 /*
388 * Append a packet to the transmit buffer-queue.
389 *
390 * Parameter:
391 * channel = Number of B-channel
392 * skb = packet to send.
393 * card = pointer to card-struct
394 * Return:
395 * Number of bytes transferred, -E??? on error
396 */
397 static int
isdnloop_sendbuf(int channel,struct sk_buff * skb,isdnloop_card * card)398 isdnloop_sendbuf(int channel, struct sk_buff *skb, isdnloop_card *card)
399 {
400 int len = skb->len;
401 unsigned long flags;
402 struct sk_buff *nskb;
403
404 if (len > 4000) {
405 printk(KERN_WARNING
406 "isdnloop: Send packet too large\n");
407 return -EINVAL;
408 }
409 if (len) {
410 if (!(card->flags & (channel ? ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE)))
411 return 0;
412 if (card->sndcount[channel] > ISDNLOOP_MAX_SQUEUE)
413 return 0;
414 spin_lock_irqsave(&card->isdnloop_lock, flags);
415 nskb = dev_alloc_skb(skb->len);
416 if (nskb) {
417 skb_copy_from_linear_data(skb,
418 skb_put(nskb, len), len);
419 skb_queue_tail(&card->bqueue[channel], nskb);
420 dev_kfree_skb(skb);
421 } else
422 len = 0;
423 card->sndcount[channel] += len;
424 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
425 }
426 return len;
427 }
428
429 /*
430 * Read the messages from the card's ringbuffer
431 *
432 * Parameter:
433 * buf = pointer to buffer.
434 * len = number of bytes to read.
435 * user = flag, 1: called from userlevel 0: called from kernel.
436 * card = pointer to card struct.
437 * Return:
438 * number of bytes actually transferred.
439 */
440 static int
isdnloop_readstatus(u_char __user * buf,int len,isdnloop_card * card)441 isdnloop_readstatus(u_char __user *buf, int len, isdnloop_card *card)
442 {
443 int count;
444 u_char __user *p;
445
446 for (p = buf, count = 0; count < len; p++, count++) {
447 if (card->msg_buf_read == card->msg_buf_write)
448 return count;
449 if (put_user(*card->msg_buf_read++, p))
450 return -EFAULT;
451 if (card->msg_buf_read > card->msg_buf_end)
452 card->msg_buf_read = card->msg_buf;
453 }
454 return count;
455 }
456
457 /*
458 * Simulate a card's response by appending it to the cards
459 * message queue.
460 *
461 * Parameter:
462 * card = pointer to card struct.
463 * s = pointer to message-string.
464 * ch = channel: 0 = generic messages, 1 and 2 = D-channel messages.
465 * Return:
466 * 0 on success, 1 on memory squeeze.
467 */
468 static int
isdnloop_fake(isdnloop_card * card,char * s,int ch)469 isdnloop_fake(isdnloop_card *card, char *s, int ch)
470 {
471 struct sk_buff *skb;
472 int len = strlen(s) + ((ch >= 0) ? 3 : 0);
473 skb = dev_alloc_skb(len);
474 if (!skb) {
475 printk(KERN_WARNING "isdnloop: Out of memory in isdnloop_fake\n");
476 return 1;
477 }
478 if (ch >= 0)
479 sprintf(skb_put(skb, 3), "%02d;", ch);
480 skb_put_data(skb, s, strlen(s));
481 skb_queue_tail(&card->dqueue, skb);
482 return 0;
483 }
484 /* *INDENT-OFF* */
485 static isdnloop_stat isdnloop_cmd_table[] = {
486 {"BCON_R", 0, 1}, /* B-Channel connect */
487 {"BCON_I", 0, 17}, /* B-Channel connect ind */
488 {"BDIS_R", 0, 2}, /* B-Channel disconnect */
489 {"DDIS_R", 0, 3}, /* D-Channel disconnect */
490 {"DCON_R", 0, 16}, /* D-Channel connect */
491 {"DSCA_R", 0, 4}, /* Dial 1TR6-SPV */
492 {"DCAL_R", 0, 5}, /* Dial */
493 {"EAZC", 0, 6}, /* Clear EAZ listener */
494 {"EAZ", 0, 7}, /* Set EAZ listener */
495 {"SEEAZ", 0, 8}, /* Get EAZ listener */
496 {"MSN", 0, 9}, /* Set/Clear MSN listener */
497 {"MSALL", 0, 10}, /* Set multi MSN listeners */
498 {"SETSIL", 0, 11}, /* Set SI list */
499 {"SEESIL", 0, 12}, /* Get SI list */
500 {"SILC", 0, 13}, /* Clear SI list */
501 {"LOCK", 0, -1}, /* LOCK channel */
502 {"UNLOCK", 0, -1}, /* UNLOCK channel */
503 {"FV2ON", 1, 14}, /* Leased mode on */
504 {"FV2OFF", 1, 15}, /* Leased mode off */
505 {NULL, 0, -1}
506 };
507 /* *INDENT-ON* */
508
509
510 /*
511 * Simulate an error-response from a card.
512 *
513 * Parameter:
514 * card = pointer to card struct.
515 */
516 static void
isdnloop_fake_err(isdnloop_card * card)517 isdnloop_fake_err(isdnloop_card *card)
518 {
519 char buf[64];
520
521 snprintf(buf, sizeof(buf), "E%s", card->omsg);
522 isdnloop_fake(card, buf, -1);
523 isdnloop_fake(card, "NAK", -1);
524 }
525
526 static u_char ctable_eu[] = {0x00, 0x11, 0x01, 0x12};
527 static u_char ctable_1t[] = {0x00, 0x3b, 0x01, 0x3a};
528
529 /*
530 * Assemble a simplified cause message depending on the
531 * D-channel protocol used.
532 *
533 * Parameter:
534 * card = pointer to card struct.
535 * loc = location: 0 = local, 1 = remote.
536 * cau = cause: 1 = busy, 2 = nonexistent callerid, 3 = no user responding.
537 * Return:
538 * Pointer to buffer containing the assembled message.
539 */
540 static char *
isdnloop_unicause(isdnloop_card * card,int loc,int cau)541 isdnloop_unicause(isdnloop_card *card, int loc, int cau)
542 {
543 static char buf[6];
544
545 switch (card->ptype) {
546 case ISDN_PTYPE_EURO:
547 sprintf(buf, "E%02X%02X", (loc) ? 4 : 2, ctable_eu[cau]);
548 break;
549 case ISDN_PTYPE_1TR6:
550 sprintf(buf, "%02X44", ctable_1t[cau]);
551 break;
552 default:
553 return "0000";
554 }
555 return buf;
556 }
557
558 /*
559 * Release a virtual connection. Called from timer interrupt, when
560 * called party did not respond.
561 *
562 * Parameter:
563 * card = pointer to card struct.
564 * ch = channel (0-based)
565 */
566 static void
isdnloop_atimeout(isdnloop_card * card,int ch)567 isdnloop_atimeout(isdnloop_card *card, int ch)
568 {
569 unsigned long flags;
570 char buf[60];
571
572 spin_lock_irqsave(&card->isdnloop_lock, flags);
573 if (card->rcard) {
574 isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
575 card->rcard[ch]->rcard[card->rch[ch]] = NULL;
576 card->rcard[ch] = NULL;
577 }
578 isdnloop_fake(card, "DDIS_I", ch + 1);
579 /* No user responding */
580 sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 3));
581 isdnloop_fake(card, buf, ch + 1);
582 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
583 }
584
585 /*
586 * Wrapper for isdnloop_atimeout().
587 */
588 static void
isdnloop_atimeout0(struct timer_list * t)589 isdnloop_atimeout0(struct timer_list *t)
590 {
591 isdnloop_card *card = from_timer(card, t, c_timer[0]);
592
593 isdnloop_atimeout(card, 0);
594 }
595
596 /*
597 * Wrapper for isdnloop_atimeout().
598 */
599 static void
isdnloop_atimeout1(struct timer_list * t)600 isdnloop_atimeout1(struct timer_list *t)
601 {
602 isdnloop_card *card = from_timer(card, t, c_timer[1]);
603
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 timer_setup(&card->c_timer[ch], ch ? isdnloop_atimeout1
621 : isdnloop_atimeout0, 0);
622 card->c_timer[ch].expires = jiffies + ISDNLOOP_TIMER_ALERTWAIT;
623 add_timer(&card->c_timer[ch]);
624 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
625 }
626
627 /*
628 * Kill a pending channel watchdog.
629 *
630 * Parameter:
631 * card = pointer to card struct.
632 * ch = channel (0-based).
633 */
634 static void
isdnloop_kill_ctimer(isdnloop_card * card,int ch)635 isdnloop_kill_ctimer(isdnloop_card *card, int ch)
636 {
637 unsigned long flags;
638
639 spin_lock_irqsave(&card->isdnloop_lock, flags);
640 del_timer(&card->c_timer[ch]);
641 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
642 }
643
644 static u_char si2bit[] = {0, 1, 0, 0, 0, 2, 0, 4, 0, 0};
645 static u_char bit2si[] = {1, 5, 7};
646
647 /*
648 * Try finding a listener for an outgoing call.
649 *
650 * Parameter:
651 * card = pointer to calling card.
652 * p = pointer to ICN-type setup-string.
653 * lch = channel of calling card.
654 * cmd = pointer to struct to be filled when parsing setup.
655 * Return:
656 * 0 = found match, alerting should happen.
657 * 1 = found matching number but it is busy.
658 * 2 = no matching listener.
659 * 3 = found matching number but SI does not match.
660 */
661 static int
isdnloop_try_call(isdnloop_card * card,char * p,int lch,isdn_ctrl * cmd)662 isdnloop_try_call(isdnloop_card *card, char *p, int lch, isdn_ctrl *cmd)
663 {
664 isdnloop_card *cc = cards;
665 unsigned long flags;
666 int ch;
667 int num_match;
668 int i;
669 char *e;
670 char nbuf[32];
671
672 isdnloop_parse_setup(p, cmd);
673 while (cc) {
674 for (ch = 0; ch < 2; ch++) {
675 /* Exclude ourself */
676 if ((cc == card) && (ch == lch))
677 continue;
678 num_match = 0;
679 switch (cc->ptype) {
680 case ISDN_PTYPE_EURO:
681 for (i = 0; i < 3; i++)
682 if (!(strcmp(cc->s0num[i], cmd->parm.setup.phone)))
683 num_match = 1;
684 break;
685 case ISDN_PTYPE_1TR6:
686 e = cc->eazlist[ch];
687 while (*e) {
688 sprintf(nbuf, "%s%c", cc->s0num[0], *e);
689 if (!(strcmp(nbuf, cmd->parm.setup.phone)))
690 num_match = 1;
691 e++;
692 }
693 }
694 if (num_match) {
695 spin_lock_irqsave(&card->isdnloop_lock, flags);
696 /* channel idle? */
697 if (!(cc->rcard[ch])) {
698 /* Check SI */
699 if (!(si2bit[cmd->parm.setup.si1] & cc->sil[ch])) {
700 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
701 return 3;
702 }
703 /* ch is idle, si and number matches */
704 cc->rcard[ch] = card;
705 cc->rch[ch] = lch;
706 card->rcard[lch] = cc;
707 card->rch[lch] = ch;
708 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
709 return 0;
710 } else {
711 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
712 /* num matches, but busy */
713 if (ch == 1)
714 return 1;
715 }
716 }
717 }
718 cc = cc->next;
719 }
720 return 2;
721 }
722
723 /*
724 * Depending on D-channel protocol and caller/called, modify
725 * phone number.
726 *
727 * Parameter:
728 * card = pointer to card struct.
729 * phone = pointer phone number.
730 * caller = flag: 1 = caller, 0 = called.
731 * Return:
732 * pointer to new phone number.
733 */
734 static char *
isdnloop_vstphone(isdnloop_card * card,char * phone,int caller)735 isdnloop_vstphone(isdnloop_card *card, char *phone, int caller)
736 {
737 int i;
738 static char nphone[30];
739
740 if (!card) {
741 printk("BUG!!!\n");
742 return "";
743 }
744 switch (card->ptype) {
745 case ISDN_PTYPE_EURO:
746 if (caller) {
747 for (i = 0; i < 2; i++)
748 if (!(strcmp(card->s0num[i], phone)))
749 return phone;
750 return card->s0num[0];
751 }
752 return phone;
753 break;
754 case ISDN_PTYPE_1TR6:
755 if (caller) {
756 sprintf(nphone, "%s%c", card->s0num[0], phone[0]);
757 return nphone;
758 } else
759 return &phone[strlen(phone) - 1];
760 break;
761 }
762 return "";
763 }
764
765 /*
766 * Parse an ICN-type command string sent to the 'card'.
767 * Perform misc. actions depending on the command.
768 *
769 * Parameter:
770 * card = pointer to card struct.
771 */
772 static void
isdnloop_parse_cmd(isdnloop_card * card)773 isdnloop_parse_cmd(isdnloop_card *card)
774 {
775 char *p = card->omsg;
776 isdn_ctrl cmd;
777 char buf[60];
778 isdnloop_stat *s = isdnloop_cmd_table;
779 int action = -1;
780 int i;
781 int ch;
782
783 if ((card->omsg[0] != '0') && (card->omsg[2] != ';')) {
784 isdnloop_fake_err(card);
785 return;
786 }
787 ch = card->omsg[1] - '0';
788 if ((ch < 0) || (ch > 2)) {
789 isdnloop_fake_err(card);
790 return;
791 }
792 p += 3;
793 while (s->statstr) {
794 if (!strncmp(p, s->statstr, strlen(s->statstr))) {
795 action = s->action;
796 if (s->command && (ch != 0)) {
797 isdnloop_fake_err(card);
798 return;
799 }
800 break;
801 }
802 s++;
803 }
804 if (action == -1)
805 return;
806 switch (action) {
807 case 1:
808 /* 0x;BCON_R */
809 if (card->rcard[ch - 1]) {
810 isdnloop_fake(card->rcard[ch - 1], "BCON_I",
811 card->rch[ch - 1] + 1);
812 isdnloop_fake(card, "BCON_C", ch);
813 }
814 break;
815 case 17:
816 /* 0x;BCON_I */
817 if (card->rcard[ch - 1]) {
818 isdnloop_fake(card->rcard[ch - 1], "BCON_C",
819 card->rch[ch - 1] + 1);
820 }
821 break;
822 case 2:
823 /* 0x;BDIS_R */
824 isdnloop_fake(card, "BDIS_C", ch);
825 if (card->rcard[ch - 1]) {
826 isdnloop_fake(card->rcard[ch - 1], "BDIS_I",
827 card->rch[ch - 1] + 1);
828 }
829 break;
830 case 16:
831 /* 0x;DCON_R */
832 isdnloop_kill_ctimer(card, ch - 1);
833 if (card->rcard[ch - 1]) {
834 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
835 isdnloop_fake(card->rcard[ch - 1], "DCON_C",
836 card->rch[ch - 1] + 1);
837 isdnloop_fake(card, "DCON_C", ch);
838 }
839 break;
840 case 3:
841 /* 0x;DDIS_R */
842 isdnloop_kill_ctimer(card, ch - 1);
843 if (card->rcard[ch - 1]) {
844 isdnloop_kill_ctimer(card->rcard[ch - 1], card->rch[ch - 1]);
845 isdnloop_fake(card->rcard[ch - 1], "DDIS_I",
846 card->rch[ch - 1] + 1);
847 card->rcard[ch - 1] = NULL;
848 }
849 isdnloop_fake(card, "DDIS_C", ch);
850 break;
851 case 4:
852 /* 0x;DSCA_Rdd,yy,zz,oo */
853 if (card->ptype != ISDN_PTYPE_1TR6) {
854 isdnloop_fake_err(card);
855 return;
856 }
857 /* Fall through */
858 case 5:
859 /* 0x;DCAL_Rdd,yy,zz,oo */
860 p += 6;
861 switch (isdnloop_try_call(card, p, ch - 1, &cmd)) {
862 case 0:
863 /* Alerting */
864 sprintf(buf, "D%s_I%s,%02d,%02d,%s",
865 (action == 4) ? "SCA" : "CAL",
866 isdnloop_vstphone(card, cmd.parm.setup.eazmsn, 1),
867 cmd.parm.setup.si1,
868 cmd.parm.setup.si2,
869 isdnloop_vstphone(card->rcard[ch - 1],
870 cmd.parm.setup.phone, 0));
871 isdnloop_fake(card->rcard[ch - 1], buf, card->rch[ch - 1] + 1);
872 /* Fall through */
873 case 3:
874 /* si1 does not match, don't alert but start timer */
875 isdnloop_start_ctimer(card, ch - 1);
876 break;
877 case 1:
878 /* Remote busy */
879 isdnloop_fake(card, "DDIS_I", ch);
880 sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 1));
881 isdnloop_fake(card, buf, ch);
882 break;
883 case 2:
884 /* No such user */
885 isdnloop_fake(card, "DDIS_I", ch);
886 sprintf(buf, "CAU%s", isdnloop_unicause(card, 1, 2));
887 isdnloop_fake(card, buf, ch);
888 break;
889 }
890 break;
891 case 6:
892 /* 0x;EAZC */
893 card->eazlist[ch - 1][0] = '\0';
894 break;
895 case 7:
896 /* 0x;EAZ */
897 p += 3;
898 if (strlen(p) >= sizeof(card->eazlist[0]))
899 break;
900 strcpy(card->eazlist[ch - 1], p);
901 break;
902 case 8:
903 /* 0x;SEEAZ */
904 sprintf(buf, "EAZ-LIST: %s", card->eazlist[ch - 1]);
905 isdnloop_fake(card, buf, ch + 1);
906 break;
907 case 9:
908 /* 0x;MSN */
909 break;
910 case 10:
911 /* 0x;MSNALL */
912 break;
913 case 11:
914 /* 0x;SETSIL */
915 p += 6;
916 i = 0;
917 while (strchr("0157", *p)) {
918 if (i)
919 card->sil[ch - 1] |= si2bit[*p - '0'];
920 i = (*p++ == '0');
921 }
922 if (*p)
923 isdnloop_fake_err(card);
924 break;
925 case 12:
926 /* 0x;SEESIL */
927 sprintf(buf, "SIN-LIST: ");
928 p = buf + 10;
929 for (i = 0; i < 3; i++)
930 if (card->sil[ch - 1] & (1 << i))
931 p += sprintf(p, "%02d", bit2si[i]);
932 isdnloop_fake(card, buf, ch + 1);
933 break;
934 case 13:
935 /* 0x;SILC */
936 card->sil[ch - 1] = 0;
937 break;
938 case 14:
939 /* 00;FV2ON */
940 break;
941 case 15:
942 /* 00;FV2OFF */
943 break;
944 }
945 }
946
947 /*
948 * Put command-strings into the of the 'card'. In reality, execute them
949 * right in place by calling isdnloop_parse_cmd(). Also copy every
950 * command to the read message ringbuffer, preceding it with a '>'.
951 * These mesagges can be read at /dev/isdnctrl.
952 *
953 * Parameter:
954 * buf = pointer to command buffer.
955 * len = length of buffer data.
956 * user = flag: 1 = called form userlevel, 0 called from kernel.
957 * card = pointer to card struct.
958 * Return:
959 * number of bytes transferred (currently always equals len).
960 */
961 static int
isdnloop_writecmd(const u_char * buf,int len,int user,isdnloop_card * card)962 isdnloop_writecmd(const u_char *buf, int len, int user, isdnloop_card *card)
963 {
964 int xcount = 0;
965 int ocount = 1;
966 isdn_ctrl cmd;
967
968 while (len) {
969 int count = len;
970 u_char *p;
971 u_char msg[0x100];
972
973 if (count > 255)
974 count = 255;
975 if (user) {
976 if (copy_from_user(msg, buf, count))
977 return -EFAULT;
978 } else
979 memcpy(msg, buf, count);
980 isdnloop_putmsg(card, '>');
981 for (p = msg; count > 0; count--, p++) {
982 len--;
983 xcount++;
984 isdnloop_putmsg(card, *p);
985 card->omsg[card->optr] = *p;
986 if (*p == '\n') {
987 card->omsg[card->optr] = '\0';
988 card->optr = 0;
989 isdnloop_parse_cmd(card);
990 if (len) {
991 isdnloop_putmsg(card, '>');
992 ocount++;
993 }
994 } else {
995 if (card->optr < 59)
996 card->optr++;
997 }
998 ocount++;
999 }
1000 }
1001 cmd.command = ISDN_STAT_STAVAIL;
1002 cmd.driver = card->myid;
1003 cmd.arg = ocount;
1004 card->interface.statcallb(&cmd);
1005 return xcount;
1006 }
1007
1008 /*
1009 * Delete card's pending timers, send STOP to linklevel
1010 */
1011 static void
isdnloop_stopcard(isdnloop_card * card)1012 isdnloop_stopcard(isdnloop_card *card)
1013 {
1014 unsigned long flags;
1015 isdn_ctrl cmd;
1016
1017 spin_lock_irqsave(&card->isdnloop_lock, flags);
1018 if (card->flags & ISDNLOOP_FLAGS_RUNNING) {
1019 card->flags &= ~ISDNLOOP_FLAGS_RUNNING;
1020 del_timer(&card->st_timer);
1021 del_timer(&card->rb_timer);
1022 del_timer(&card->c_timer[0]);
1023 del_timer(&card->c_timer[1]);
1024 cmd.command = ISDN_STAT_STOP;
1025 cmd.driver = card->myid;
1026 card->interface.statcallb(&cmd);
1027 }
1028 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1029 }
1030
1031 /*
1032 * Stop all cards before unload.
1033 */
1034 static void
isdnloop_stopallcards(void)1035 isdnloop_stopallcards(void)
1036 {
1037 isdnloop_card *p = cards;
1038
1039 while (p) {
1040 isdnloop_stopcard(p);
1041 p = p->next;
1042 }
1043 }
1044
1045 /*
1046 * Start a 'card'. Simulate card's boot message and set the phone
1047 * number(s) of the virtual 'S0-Interface'. Install D-channel
1048 * poll timer.
1049 *
1050 * Parameter:
1051 * card = pointer to card struct.
1052 * sdefp = pointer to struct holding ioctl parameters.
1053 * Return:
1054 * 0 on success, -E??? otherwise.
1055 */
1056 static int
isdnloop_start(isdnloop_card * card,isdnloop_sdef * sdefp)1057 isdnloop_start(isdnloop_card *card, isdnloop_sdef *sdefp)
1058 {
1059 unsigned long flags;
1060 isdnloop_sdef sdef;
1061 int i;
1062
1063 if (card->flags & ISDNLOOP_FLAGS_RUNNING)
1064 return -EBUSY;
1065 if (copy_from_user((char *) &sdef, (char *) sdefp, sizeof(sdef)))
1066 return -EFAULT;
1067
1068 for (i = 0; i < 3; i++) {
1069 if (!memchr(sdef.num[i], 0, sizeof(sdef.num[i])))
1070 return -EINVAL;
1071 }
1072
1073 spin_lock_irqsave(&card->isdnloop_lock, flags);
1074 switch (sdef.ptype) {
1075 case ISDN_PTYPE_EURO:
1076 if (isdnloop_fake(card, "DRV1.23EC-Q.931-CAPI-CNS-BASIS-20.02.96",
1077 -1)) {
1078 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1079 return -ENOMEM;
1080 }
1081 card->sil[0] = card->sil[1] = 4;
1082 if (isdnloop_fake(card, "TEI OK", 0)) {
1083 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1084 return -ENOMEM;
1085 }
1086 for (i = 0; i < 3; i++) {
1087 strlcpy(card->s0num[i], sdef.num[i],
1088 sizeof(card->s0num[0]));
1089 }
1090 break;
1091 case ISDN_PTYPE_1TR6:
1092 if (isdnloop_fake(card, "DRV1.04TC-1TR6-CAPI-CNS-BASIS-29.11.95",
1093 -1)) {
1094 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1095 return -ENOMEM;
1096 }
1097 card->sil[0] = card->sil[1] = 4;
1098 if (isdnloop_fake(card, "TEI OK", 0)) {
1099 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1100 return -ENOMEM;
1101 }
1102 strlcpy(card->s0num[0], sdef.num[0], sizeof(card->s0num[0]));
1103 card->s0num[1][0] = '\0';
1104 card->s0num[2][0] = '\0';
1105 break;
1106 default:
1107 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1108 printk(KERN_WARNING "isdnloop: Illegal D-channel protocol %d\n",
1109 sdef.ptype);
1110 return -EINVAL;
1111 }
1112 timer_setup(&card->rb_timer, isdnloop_pollbchan, 0);
1113 timer_setup(&card->st_timer, isdnloop_polldchan, 0);
1114 card->st_timer.expires = jiffies + ISDNLOOP_TIMER_DCREAD;
1115 add_timer(&card->st_timer);
1116 card->flags |= ISDNLOOP_FLAGS_RUNNING;
1117 spin_unlock_irqrestore(&card->isdnloop_lock, flags);
1118 return 0;
1119 }
1120
1121 /*
1122 * Main handler for commands sent by linklevel.
1123 */
1124 static int
isdnloop_command(isdn_ctrl * c,isdnloop_card * card)1125 isdnloop_command(isdn_ctrl *c, isdnloop_card *card)
1126 {
1127 ulong a;
1128 int i;
1129 char cbuf[80];
1130 isdn_ctrl cmd;
1131 isdnloop_cdef cdef;
1132
1133 switch (c->command) {
1134 case ISDN_CMD_IOCTL:
1135 memcpy(&a, c->parm.num, sizeof(ulong));
1136 switch (c->arg) {
1137 case ISDNLOOP_IOCTL_DEBUGVAR:
1138 return (ulong) card;
1139 case ISDNLOOP_IOCTL_STARTUP:
1140 return isdnloop_start(card, (isdnloop_sdef *) a);
1141 break;
1142 case ISDNLOOP_IOCTL_ADDCARD:
1143 if (copy_from_user((char *)&cdef,
1144 (char *)a,
1145 sizeof(cdef)))
1146 return -EFAULT;
1147 return isdnloop_addcard(cdef.id1);
1148 break;
1149 case ISDNLOOP_IOCTL_LEASEDCFG:
1150 if (a) {
1151 if (!card->leased) {
1152 card->leased = 1;
1153 while (card->ptype == ISDN_PTYPE_UNKNOWN)
1154 schedule_timeout_interruptible(10);
1155 schedule_timeout_interruptible(10);
1156 sprintf(cbuf, "00;FV2ON\n01;EAZ1\n02;EAZ2\n");
1157 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1158 printk(KERN_INFO
1159 "isdnloop: (%s) Leased-line mode enabled\n",
1160 CID);
1161 cmd.command = ISDN_STAT_RUN;
1162 cmd.driver = card->myid;
1163 cmd.arg = 0;
1164 card->interface.statcallb(&cmd);
1165 }
1166 } else {
1167 if (card->leased) {
1168 card->leased = 0;
1169 sprintf(cbuf, "00;FV2OFF\n");
1170 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1171 printk(KERN_INFO
1172 "isdnloop: (%s) Leased-line mode disabled\n",
1173 CID);
1174 cmd.command = ISDN_STAT_RUN;
1175 cmd.driver = card->myid;
1176 cmd.arg = 0;
1177 card->interface.statcallb(&cmd);
1178 }
1179 }
1180 return 0;
1181 default:
1182 return -EINVAL;
1183 }
1184 break;
1185 case ISDN_CMD_DIAL:
1186 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1187 return -ENODEV;
1188 if (card->leased)
1189 break;
1190 if ((c->arg & 255) < ISDNLOOP_BCH) {
1191 char *p;
1192 char dcode[4];
1193
1194 a = c->arg;
1195 p = c->parm.setup.phone;
1196 if (*p == 's' || *p == 'S') {
1197 /* Dial for SPV */
1198 p++;
1199 strcpy(dcode, "SCA");
1200 } else
1201 /* Normal Dial */
1202 strcpy(dcode, "CAL");
1203 snprintf(cbuf, sizeof(cbuf),
1204 "%02d;D%s_R%s,%02d,%02d,%s\n", (int) (a + 1),
1205 dcode, p, c->parm.setup.si1,
1206 c->parm.setup.si2, c->parm.setup.eazmsn);
1207 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1208 }
1209 break;
1210 case ISDN_CMD_ACCEPTD:
1211 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1212 return -ENODEV;
1213 if (c->arg < ISDNLOOP_BCH) {
1214 a = c->arg + 1;
1215 cbuf[0] = 0;
1216 switch (card->l2_proto[a - 1]) {
1217 case ISDN_PROTO_L2_X75I:
1218 sprintf(cbuf, "%02d;BX75\n", (int) a);
1219 break;
1220 #ifdef CONFIG_ISDN_X25
1221 case ISDN_PROTO_L2_X25DTE:
1222 sprintf(cbuf, "%02d;BX2T\n", (int) a);
1223 break;
1224 case ISDN_PROTO_L2_X25DCE:
1225 sprintf(cbuf, "%02d;BX2C\n", (int) a);
1226 break;
1227 #endif
1228 case ISDN_PROTO_L2_HDLC:
1229 sprintf(cbuf, "%02d;BTRA\n", (int) a);
1230 break;
1231 }
1232 if (strlen(cbuf))
1233 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1234 sprintf(cbuf, "%02d;DCON_R\n", (int) a);
1235 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1236 }
1237 break;
1238 case ISDN_CMD_ACCEPTB:
1239 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1240 return -ENODEV;
1241 if (c->arg < ISDNLOOP_BCH) {
1242 a = c->arg + 1;
1243 switch (card->l2_proto[a - 1]) {
1244 case ISDN_PROTO_L2_X75I:
1245 sprintf(cbuf, "%02d;BCON_R,BX75\n", (int) a);
1246 break;
1247 #ifdef CONFIG_ISDN_X25
1248 case ISDN_PROTO_L2_X25DTE:
1249 sprintf(cbuf, "%02d;BCON_R,BX2T\n", (int) a);
1250 break;
1251 case ISDN_PROTO_L2_X25DCE:
1252 sprintf(cbuf, "%02d;BCON_R,BX2C\n", (int) a);
1253 break;
1254 #endif
1255 case ISDN_PROTO_L2_HDLC:
1256 sprintf(cbuf, "%02d;BCON_R,BTRA\n", (int) a);
1257 break;
1258 default:
1259 sprintf(cbuf, "%02d;BCON_R\n", (int) a);
1260 }
1261 printk(KERN_DEBUG "isdnloop writecmd '%s'\n", cbuf);
1262 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1263 break;
1264 case ISDN_CMD_HANGUP:
1265 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1266 return -ENODEV;
1267 if (c->arg < ISDNLOOP_BCH) {
1268 a = c->arg + 1;
1269 sprintf(cbuf, "%02d;BDIS_R\n%02d;DDIS_R\n", (int) a, (int) a);
1270 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1271 }
1272 break;
1273 case ISDN_CMD_SETEAZ:
1274 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1275 return -ENODEV;
1276 if (card->leased)
1277 break;
1278 if (c->arg < ISDNLOOP_BCH) {
1279 a = c->arg + 1;
1280 if (card->ptype == ISDN_PTYPE_EURO) {
1281 sprintf(cbuf, "%02d;MS%s%s\n", (int) a,
1282 c->parm.num[0] ? "N" : "ALL", c->parm.num);
1283 } else
1284 sprintf(cbuf, "%02d;EAZ%s\n", (int) a,
1285 c->parm.num[0] ? c->parm.num : (u_char *) "0123456789");
1286 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1287 }
1288 break;
1289 case ISDN_CMD_CLREAZ:
1290 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1291 return -ENODEV;
1292 if (card->leased)
1293 break;
1294 if (c->arg < ISDNLOOP_BCH) {
1295 a = c->arg + 1;
1296 if (card->ptype == ISDN_PTYPE_EURO)
1297 sprintf(cbuf, "%02d;MSNC\n", (int) a);
1298 else
1299 sprintf(cbuf, "%02d;EAZC\n", (int) a);
1300 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1301 }
1302 break;
1303 case ISDN_CMD_SETL2:
1304 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1305 return -ENODEV;
1306 if ((c->arg & 255) < ISDNLOOP_BCH) {
1307 a = c->arg;
1308 switch (a >> 8) {
1309 case ISDN_PROTO_L2_X75I:
1310 sprintf(cbuf, "%02d;BX75\n", (int) (a & 255) + 1);
1311 break;
1312 #ifdef CONFIG_ISDN_X25
1313 case ISDN_PROTO_L2_X25DTE:
1314 sprintf(cbuf, "%02d;BX2T\n", (int) (a & 255) + 1);
1315 break;
1316 case ISDN_PROTO_L2_X25DCE:
1317 sprintf(cbuf, "%02d;BX2C\n", (int) (a & 255) + 1);
1318 break;
1319 #endif
1320 case ISDN_PROTO_L2_HDLC:
1321 sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1322 break;
1323 case ISDN_PROTO_L2_TRANS:
1324 sprintf(cbuf, "%02d;BTRA\n", (int) (a & 255) + 1);
1325 break;
1326 default:
1327 return -EINVAL;
1328 }
1329 i = isdnloop_writecmd(cbuf, strlen(cbuf), 0, card);
1330 card->l2_proto[a & 255] = (a >> 8);
1331 }
1332 break;
1333 case ISDN_CMD_SETL3:
1334 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1335 return -ENODEV;
1336 return 0;
1337 default:
1338 return -EINVAL;
1339 }
1340 }
1341 return 0;
1342 }
1343
1344 /*
1345 * Find card with given driverId
1346 */
1347 static inline isdnloop_card *
isdnloop_findcard(int driverid)1348 isdnloop_findcard(int driverid)
1349 {
1350 isdnloop_card *p = cards;
1351
1352 while (p) {
1353 if (p->myid == driverid)
1354 return p;
1355 p = p->next;
1356 }
1357 return (isdnloop_card *) 0;
1358 }
1359
1360 /*
1361 * Wrapper functions for interface to linklevel
1362 */
1363 static int
if_command(isdn_ctrl * c)1364 if_command(isdn_ctrl *c)
1365 {
1366 isdnloop_card *card = isdnloop_findcard(c->driver);
1367
1368 if (card)
1369 return isdnloop_command(c, card);
1370 printk(KERN_ERR
1371 "isdnloop: if_command called with invalid driverId!\n");
1372 return -ENODEV;
1373 }
1374
1375 static int
if_writecmd(const u_char __user * buf,int len,int id,int channel)1376 if_writecmd(const u_char __user *buf, int len, int id, int channel)
1377 {
1378 isdnloop_card *card = isdnloop_findcard(id);
1379
1380 if (card) {
1381 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1382 return -ENODEV;
1383 return isdnloop_writecmd(buf, len, 1, card);
1384 }
1385 printk(KERN_ERR
1386 "isdnloop: if_writecmd called with invalid driverId!\n");
1387 return -ENODEV;
1388 }
1389
1390 static int
if_readstatus(u_char __user * buf,int len,int id,int channel)1391 if_readstatus(u_char __user *buf, int len, int id, int channel)
1392 {
1393 isdnloop_card *card = isdnloop_findcard(id);
1394
1395 if (card) {
1396 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1397 return -ENODEV;
1398 return isdnloop_readstatus(buf, len, card);
1399 }
1400 printk(KERN_ERR
1401 "isdnloop: if_readstatus called with invalid driverId!\n");
1402 return -ENODEV;
1403 }
1404
1405 static int
if_sendbuf(int id,int channel,int ack,struct sk_buff * skb)1406 if_sendbuf(int id, int channel, int ack, struct sk_buff *skb)
1407 {
1408 isdnloop_card *card = isdnloop_findcard(id);
1409
1410 if (card) {
1411 if (!(card->flags & ISDNLOOP_FLAGS_RUNNING))
1412 return -ENODEV;
1413 /* ack request stored in skb scratch area */
1414 *(skb->head) = ack;
1415 return isdnloop_sendbuf(channel, skb, card);
1416 }
1417 printk(KERN_ERR
1418 "isdnloop: if_sendbuf called with invalid driverId!\n");
1419 return -ENODEV;
1420 }
1421
1422 /*
1423 * Allocate a new card-struct, initialize it
1424 * link it into cards-list and register it at linklevel.
1425 */
1426 static isdnloop_card *
isdnloop_initcard(char * id)1427 isdnloop_initcard(char *id)
1428 {
1429 isdnloop_card *card;
1430 int i;
1431 card = kzalloc(sizeof(isdnloop_card), GFP_KERNEL);
1432 if (!card) {
1433 printk(KERN_WARNING
1434 "isdnloop: (%s) Could not allocate card-struct.\n", id);
1435 return (isdnloop_card *) 0;
1436 }
1437 card->interface.owner = THIS_MODULE;
1438 card->interface.channels = ISDNLOOP_BCH;
1439 card->interface.hl_hdrlen = 1; /* scratch area for storing ack flag*/
1440 card->interface.maxbufsize = 4000;
1441 card->interface.command = if_command;
1442 card->interface.writebuf_skb = if_sendbuf;
1443 card->interface.writecmd = if_writecmd;
1444 card->interface.readstat = if_readstatus;
1445 card->interface.features = ISDN_FEATURE_L2_X75I |
1446 #ifdef CONFIG_ISDN_X25
1447 ISDN_FEATURE_L2_X25DTE |
1448 ISDN_FEATURE_L2_X25DCE |
1449 #endif
1450 ISDN_FEATURE_L2_HDLC |
1451 ISDN_FEATURE_L3_TRANS |
1452 ISDN_FEATURE_P_UNKNOWN;
1453 card->ptype = ISDN_PTYPE_UNKNOWN;
1454 strlcpy(card->interface.id, id, sizeof(card->interface.id));
1455 card->msg_buf_write = card->msg_buf;
1456 card->msg_buf_read = card->msg_buf;
1457 card->msg_buf_end = &card->msg_buf[sizeof(card->msg_buf) - 1];
1458 for (i = 0; i < ISDNLOOP_BCH; i++) {
1459 card->l2_proto[i] = ISDN_PROTO_L2_X75I;
1460 skb_queue_head_init(&card->bqueue[i]);
1461 }
1462 skb_queue_head_init(&card->dqueue);
1463 spin_lock_init(&card->isdnloop_lock);
1464 card->next = cards;
1465 cards = card;
1466 if (!register_isdn(&card->interface)) {
1467 cards = cards->next;
1468 printk(KERN_WARNING
1469 "isdnloop: Unable to register %s\n", id);
1470 kfree(card);
1471 return (isdnloop_card *) 0;
1472 }
1473 card->myid = card->interface.channels;
1474 return card;
1475 }
1476
1477 static int
isdnloop_addcard(char * id1)1478 isdnloop_addcard(char *id1)
1479 {
1480 isdnloop_card *card;
1481 card = isdnloop_initcard(id1);
1482 if (!card) {
1483 return -EIO;
1484 }
1485 printk(KERN_INFO
1486 "isdnloop: (%s) virtual card added\n",
1487 card->interface.id);
1488 return 0;
1489 }
1490
1491 static int __init
isdnloop_init(void)1492 isdnloop_init(void)
1493 {
1494 if (isdnloop_id)
1495 return isdnloop_addcard(isdnloop_id);
1496
1497 return 0;
1498 }
1499
1500 static void __exit
isdnloop_exit(void)1501 isdnloop_exit(void)
1502 {
1503 isdn_ctrl cmd;
1504 isdnloop_card *card = cards;
1505 isdnloop_card *last;
1506 int i;
1507
1508 isdnloop_stopallcards();
1509 while (card) {
1510 cmd.command = ISDN_STAT_UNLOAD;
1511 cmd.driver = card->myid;
1512 card->interface.statcallb(&cmd);
1513 for (i = 0; i < ISDNLOOP_BCH; i++)
1514 isdnloop_free_queue(card, i);
1515 card = card->next;
1516 }
1517 card = cards;
1518 while (card) {
1519 last = card;
1520 skb_queue_purge(&card->dqueue);
1521 card = card->next;
1522 kfree(last);
1523 }
1524 printk(KERN_NOTICE "isdnloop-ISDN-driver unloaded\n");
1525 }
1526
1527 module_init(isdnloop_init);
1528 module_exit(isdnloop_exit);
1529
