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