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18#include <linux/slab.h>
19#include <linux/mISDNif.h>
20#include <linux/kthread.h>
21#include <linux/sched.h>
22#include "core.h"
23
24static u_int *debug;
25
26static inline void
27_queue_message(struct mISDNstack *st, struct sk_buff *skb)
28{
29 struct mISDNhead *hh = mISDN_HEAD_P(skb);
30
31 if (*debug & DEBUG_QUEUE_FUNC)
32 printk(KERN_DEBUG "%s prim(%x) id(%x) %p\n",
33 __func__, hh->prim, hh->id, skb);
34 skb_queue_tail(&st->msgq, skb);
35 if (likely(!test_bit(mISDN_STACK_STOPPED, &st->status))) {
36 test_and_set_bit(mISDN_STACK_WORK, &st->status);
37 wake_up_interruptible(&st->workq);
38 }
39}
40
41static int
42mISDN_queue_message(struct mISDNchannel *ch, struct sk_buff *skb)
43{
44 _queue_message(ch->st, skb);
45 return 0;
46}
47
48static struct mISDNchannel *
49get_channel4id(struct mISDNstack *st, u_int id)
50{
51 struct mISDNchannel *ch;
52
53 mutex_lock(&st->lmutex);
54 list_for_each_entry(ch, &st->layer2, list) {
55 if (id == ch->nr)
56 goto unlock;
57 }
58 ch = NULL;
59unlock:
60 mutex_unlock(&st->lmutex);
61 return ch;
62}
63
64static void
65send_socklist(struct mISDN_sock_list *sl, struct sk_buff *skb)
66{
67 struct sock *sk;
68 struct sk_buff *cskb = NULL;
69
70 read_lock(&sl->lock);
71 sk_for_each(sk, &sl->head) {
72 if (sk->sk_state != MISDN_BOUND)
73 continue;
74 if (!cskb)
75 cskb = skb_copy(skb, GFP_KERNEL);
76 if (!cskb) {
77 printk(KERN_WARNING "%s no skb\n", __func__);
78 break;
79 }
80 if (!sock_queue_rcv_skb(sk, cskb))
81 cskb = NULL;
82 }
83 read_unlock(&sl->lock);
84 if (cskb)
85 dev_kfree_skb(cskb);
86}
87
88static void
89send_layer2(struct mISDNstack *st, struct sk_buff *skb)
90{
91 struct sk_buff *cskb;
92 struct mISDNhead *hh = mISDN_HEAD_P(skb);
93 struct mISDNchannel *ch;
94 int ret;
95
96 if (!st)
97 return;
98 mutex_lock(&st->lmutex);
99 if ((hh->id & MISDN_ID_ADDR_MASK) == MISDN_ID_ANY) {
100 list_for_each_entry(ch, &st->layer2, list) {
101 if (list_is_last(&ch->list, &st->layer2)) {
102 cskb = skb;
103 skb = NULL;
104 } else {
105 cskb = skb_copy(skb, GFP_KERNEL);
106 }
107 if (cskb) {
108 ret = ch->send(ch, cskb);
109 if (ret) {
110 if (*debug & DEBUG_SEND_ERR)
111 printk(KERN_DEBUG
112 "%s ch%d prim(%x) addr(%x)"
113 " err %d\n",
114 __func__, ch->nr,
115 hh->prim, ch->addr, ret);
116 dev_kfree_skb(cskb);
117 }
118 } else {
119 printk(KERN_WARNING "%s ch%d addr %x no mem\n",
120 __func__, ch->nr, ch->addr);
121 goto out;
122 }
123 }
124 } else {
125 list_for_each_entry(ch, &st->layer2, list) {
126 if ((hh->id & MISDN_ID_ADDR_MASK) == ch->addr) {
127 ret = ch->send(ch, skb);
128 if (!ret)
129 skb = NULL;
130 goto out;
131 }
132 }
133 ret = st->dev->teimgr->ctrl(st->dev->teimgr, CHECK_DATA, skb);
134 if (!ret)
135 skb = NULL;
136 else if (*debug & DEBUG_SEND_ERR)
137 printk(KERN_DEBUG
138 "%s mgr prim(%x) err %d\n",
139 __func__, hh->prim, ret);
140 }
141out:
142 mutex_unlock(&st->lmutex);
143 if (skb)
144 dev_kfree_skb(skb);
145}
146
147static inline int
148send_msg_to_layer(struct mISDNstack *st, struct sk_buff *skb)
149{
150 struct mISDNhead *hh = mISDN_HEAD_P(skb);
151 struct mISDNchannel *ch;
152 int lm;
153
154 lm = hh->prim & MISDN_LAYERMASK;
155 if (*debug & DEBUG_QUEUE_FUNC)
156 printk(KERN_DEBUG "%s prim(%x) id(%x) %p\n",
157 __func__, hh->prim, hh->id, skb);
158 if (lm == 0x1) {
159 if (!hlist_empty(&st->l1sock.head)) {
160 __net_timestamp(skb);
161 send_socklist(&st->l1sock, skb);
162 }
163 return st->layer1->send(st->layer1, skb);
164 } else if (lm == 0x2) {
165 if (!hlist_empty(&st->l1sock.head))
166 send_socklist(&st->l1sock, skb);
167 send_layer2(st, skb);
168 return 0;
169 } else if (lm == 0x4) {
170 ch = get_channel4id(st, hh->id);
171 if (ch)
172 return ch->send(ch, skb);
173 else
174 printk(KERN_WARNING
175 "%s: dev(%s) prim(%x) id(%x) no channel\n",
176 __func__, dev_name(&st->dev->dev), hh->prim,
177 hh->id);
178 } else if (lm == 0x8) {
179 WARN_ON(lm == 0x8);
180 ch = get_channel4id(st, hh->id);
181 if (ch)
182 return ch->send(ch, skb);
183 else
184 printk(KERN_WARNING
185 "%s: dev(%s) prim(%x) id(%x) no channel\n",
186 __func__, dev_name(&st->dev->dev), hh->prim,
187 hh->id);
188 } else {
189
190 printk(KERN_WARNING "%s: dev(%s) prim %x not delivered\n",
191 __func__, dev_name(&st->dev->dev), hh->prim);
192 }
193 return -ESRCH;
194}
195
196static void
197do_clear_stack(struct mISDNstack *st)
198{
199}
200
201static int
202mISDNStackd(void *data)
203{
204 struct mISDNstack *st = data;
205#ifdef MISDN_MSG_STATS
206 cputime_t utime, stime;
207#endif
208 int err = 0;
209
210 sigfillset(¤t->blocked);
211 if (*debug & DEBUG_MSG_THREAD)
212 printk(KERN_DEBUG "mISDNStackd %s started\n",
213 dev_name(&st->dev->dev));
214
215 if (st->notify != NULL) {
216 complete(st->notify);
217 st->notify = NULL;
218 }
219
220 for (;;) {
221 struct sk_buff *skb;
222
223 if (unlikely(test_bit(mISDN_STACK_STOPPED, &st->status))) {
224 test_and_clear_bit(mISDN_STACK_WORK, &st->status);
225 test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
226 } else
227 test_and_set_bit(mISDN_STACK_RUNNING, &st->status);
228 while (test_bit(mISDN_STACK_WORK, &st->status)) {
229 skb = skb_dequeue(&st->msgq);
230 if (!skb) {
231 test_and_clear_bit(mISDN_STACK_WORK,
232 &st->status);
233
234 skb = skb_dequeue(&st->msgq);
235 if (!skb)
236 continue;
237 test_and_set_bit(mISDN_STACK_WORK,
238 &st->status);
239 }
240#ifdef MISDN_MSG_STATS
241 st->msg_cnt++;
242#endif
243 err = send_msg_to_layer(st, skb);
244 if (unlikely(err)) {
245 if (*debug & DEBUG_SEND_ERR)
246 printk(KERN_DEBUG
247 "%s: %s prim(%x) id(%x) "
248 "send call(%d)\n",
249 __func__, dev_name(&st->dev->dev),
250 mISDN_HEAD_PRIM(skb),
251 mISDN_HEAD_ID(skb), err);
252 dev_kfree_skb(skb);
253 continue;
254 }
255 if (unlikely(test_bit(mISDN_STACK_STOPPED,
256 &st->status))) {
257 test_and_clear_bit(mISDN_STACK_WORK,
258 &st->status);
259 test_and_clear_bit(mISDN_STACK_RUNNING,
260 &st->status);
261 break;
262 }
263 }
264 if (test_bit(mISDN_STACK_CLEARING, &st->status)) {
265 test_and_set_bit(mISDN_STACK_STOPPED, &st->status);
266 test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
267 do_clear_stack(st);
268 test_and_clear_bit(mISDN_STACK_CLEARING, &st->status);
269 test_and_set_bit(mISDN_STACK_RESTART, &st->status);
270 }
271 if (test_and_clear_bit(mISDN_STACK_RESTART, &st->status)) {
272 test_and_clear_bit(mISDN_STACK_STOPPED, &st->status);
273 test_and_set_bit(mISDN_STACK_RUNNING, &st->status);
274 if (!skb_queue_empty(&st->msgq))
275 test_and_set_bit(mISDN_STACK_WORK,
276 &st->status);
277 }
278 if (test_bit(mISDN_STACK_ABORT, &st->status))
279 break;
280 if (st->notify != NULL) {
281 complete(st->notify);
282 st->notify = NULL;
283 }
284#ifdef MISDN_MSG_STATS
285 st->sleep_cnt++;
286#endif
287 test_and_clear_bit(mISDN_STACK_ACTIVE, &st->status);
288 wait_event_interruptible(st->workq, (st->status &
289 mISDN_STACK_ACTION_MASK));
290 if (*debug & DEBUG_MSG_THREAD)
291 printk(KERN_DEBUG "%s: %s wake status %08lx\n",
292 __func__, dev_name(&st->dev->dev), st->status);
293 test_and_set_bit(mISDN_STACK_ACTIVE, &st->status);
294
295 test_and_clear_bit(mISDN_STACK_WAKEUP, &st->status);
296
297 if (test_bit(mISDN_STACK_STOPPED, &st->status)) {
298 test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
299#ifdef MISDN_MSG_STATS
300 st->stopped_cnt++;
301#endif
302 }
303 }
304#ifdef MISDN_MSG_STATS
305 printk(KERN_DEBUG "mISDNStackd daemon for %s proceed %d "
306 "msg %d sleep %d stopped\n",
307 dev_name(&st->dev->dev), st->msg_cnt, st->sleep_cnt,
308 st->stopped_cnt);
309 task_cputime(st->thread, &utime, &stime);
310 printk(KERN_DEBUG
311 "mISDNStackd daemon for %s utime(%ld) stime(%ld)\n",
312 dev_name(&st->dev->dev), utime, stime);
313 printk(KERN_DEBUG
314 "mISDNStackd daemon for %s nvcsw(%ld) nivcsw(%ld)\n",
315 dev_name(&st->dev->dev), st->thread->nvcsw, st->thread->nivcsw);
316 printk(KERN_DEBUG "mISDNStackd daemon for %s killed now\n",
317 dev_name(&st->dev->dev));
318#endif
319 test_and_set_bit(mISDN_STACK_KILLED, &st->status);
320 test_and_clear_bit(mISDN_STACK_RUNNING, &st->status);
321 test_and_clear_bit(mISDN_STACK_ACTIVE, &st->status);
322 test_and_clear_bit(mISDN_STACK_ABORT, &st->status);
323 skb_queue_purge(&st->msgq);
324 st->thread = NULL;
325 if (st->notify != NULL) {
326 complete(st->notify);
327 st->notify = NULL;
328 }
329 return 0;
330}
331
332static int
333l1_receive(struct mISDNchannel *ch, struct sk_buff *skb)
334{
335 if (!ch->st)
336 return -ENODEV;
337 __net_timestamp(skb);
338 _queue_message(ch->st, skb);
339 return 0;
340}
341
342void
343set_channel_address(struct mISDNchannel *ch, u_int sapi, u_int tei)
344{
345 ch->addr = sapi | (tei << 8);
346}
347
348void
349__add_layer2(struct mISDNchannel *ch, struct mISDNstack *st)
350{
351 list_add_tail(&ch->list, &st->layer2);
352}
353
354void
355add_layer2(struct mISDNchannel *ch, struct mISDNstack *st)
356{
357 mutex_lock(&st->lmutex);
358 __add_layer2(ch, st);
359 mutex_unlock(&st->lmutex);
360}
361
362static int
363st_own_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
364{
365 if (!ch->st || !ch->st->layer1)
366 return -EINVAL;
367 return ch->st->layer1->ctrl(ch->st->layer1, cmd, arg);
368}
369
370int
371create_stack(struct mISDNdevice *dev)
372{
373 struct mISDNstack *newst;
374 int err;
375 DECLARE_COMPLETION_ONSTACK(done);
376
377 newst = kzalloc(sizeof(struct mISDNstack), GFP_KERNEL);
378 if (!newst) {
379 printk(KERN_ERR "kmalloc mISDN_stack failed\n");
380 return -ENOMEM;
381 }
382 newst->dev = dev;
383 INIT_LIST_HEAD(&newst->layer2);
384 INIT_HLIST_HEAD(&newst->l1sock.head);
385 rwlock_init(&newst->l1sock.lock);
386 init_waitqueue_head(&newst->workq);
387 skb_queue_head_init(&newst->msgq);
388 mutex_init(&newst->lmutex);
389 dev->D.st = newst;
390 err = create_teimanager(dev);
391 if (err) {
392 printk(KERN_ERR "kmalloc teimanager failed\n");
393 kfree(newst);
394 return err;
395 }
396 dev->teimgr->peer = &newst->own;
397 dev->teimgr->recv = mISDN_queue_message;
398 dev->teimgr->st = newst;
399 newst->layer1 = &dev->D;
400 dev->D.recv = l1_receive;
401 dev->D.peer = &newst->own;
402 newst->own.st = newst;
403 newst->own.ctrl = st_own_ctrl;
404 newst->own.send = mISDN_queue_message;
405 newst->own.recv = mISDN_queue_message;
406 if (*debug & DEBUG_CORE_FUNC)
407 printk(KERN_DEBUG "%s: st(%s)\n", __func__,
408 dev_name(&newst->dev->dev));
409 newst->notify = &done;
410 newst->thread = kthread_run(mISDNStackd, (void *)newst, "mISDN_%s",
411 dev_name(&newst->dev->dev));
412 if (IS_ERR(newst->thread)) {
413 err = PTR_ERR(newst->thread);
414 printk(KERN_ERR
415 "mISDN:cannot create kernel thread for %s (%d)\n",
416 dev_name(&newst->dev->dev), err);
417 delete_teimanager(dev->teimgr);
418 kfree(newst);
419 } else
420 wait_for_completion(&done);
421 return err;
422}
423
424int
425connect_layer1(struct mISDNdevice *dev, struct mISDNchannel *ch,
426 u_int protocol, struct sockaddr_mISDN *adr)
427{
428 struct mISDN_sock *msk = container_of(ch, struct mISDN_sock, ch);
429 struct channel_req rq;
430 int err;
431
432
433 if (*debug & DEBUG_CORE_FUNC)
434 printk(KERN_DEBUG "%s: %s proto(%x) adr(%d %d %d %d)\n",
435 __func__, dev_name(&dev->dev), protocol, adr->dev,
436 adr->channel, adr->sapi, adr->tei);
437 switch (protocol) {
438 case ISDN_P_NT_S0:
439 case ISDN_P_NT_E1:
440 case ISDN_P_TE_S0:
441 case ISDN_P_TE_E1:
442 ch->recv = mISDN_queue_message;
443 ch->peer = &dev->D.st->own;
444 ch->st = dev->D.st;
445 rq.protocol = protocol;
446 rq.adr.channel = adr->channel;
447 err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
448 printk(KERN_DEBUG "%s: ret %d (dev %d)\n", __func__, err,
449 dev->id);
450 if (err)
451 return err;
452 write_lock_bh(&dev->D.st->l1sock.lock);
453 sk_add_node(&msk->sk, &dev->D.st->l1sock.head);
454 write_unlock_bh(&dev->D.st->l1sock.lock);
455 break;
456 default:
457 return -ENOPROTOOPT;
458 }
459 return 0;
460}
461
462int
463connect_Bstack(struct mISDNdevice *dev, struct mISDNchannel *ch,
464 u_int protocol, struct sockaddr_mISDN *adr)
465{
466 struct channel_req rq, rq2;
467 int pmask, err;
468 struct Bprotocol *bp;
469
470 if (*debug & DEBUG_CORE_FUNC)
471 printk(KERN_DEBUG "%s: %s proto(%x) adr(%d %d %d %d)\n",
472 __func__, dev_name(&dev->dev), protocol,
473 adr->dev, adr->channel, adr->sapi,
474 adr->tei);
475 ch->st = dev->D.st;
476 pmask = 1 << (protocol & ISDN_P_B_MASK);
477 if (pmask & dev->Bprotocols) {
478 rq.protocol = protocol;
479 rq.adr = *adr;
480 err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
481 if (err)
482 return err;
483 ch->recv = rq.ch->send;
484 ch->peer = rq.ch;
485 rq.ch->recv = ch->send;
486 rq.ch->peer = ch;
487 rq.ch->st = dev->D.st;
488 } else {
489 bp = get_Bprotocol4mask(pmask);
490 if (!bp)
491 return -ENOPROTOOPT;
492 rq2.protocol = protocol;
493 rq2.adr = *adr;
494 rq2.ch = ch;
495 err = bp->create(&rq2);
496 if (err)
497 return err;
498 ch->recv = rq2.ch->send;
499 ch->peer = rq2.ch;
500 rq2.ch->st = dev->D.st;
501 rq.protocol = rq2.protocol;
502 rq.adr = *adr;
503 err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
504 if (err) {
505 rq2.ch->ctrl(rq2.ch, CLOSE_CHANNEL, NULL);
506 return err;
507 }
508 rq2.ch->recv = rq.ch->send;
509 rq2.ch->peer = rq.ch;
510 rq.ch->recv = rq2.ch->send;
511 rq.ch->peer = rq2.ch;
512 rq.ch->st = dev->D.st;
513 }
514 ch->protocol = protocol;
515 ch->nr = rq.ch->nr;
516 return 0;
517}
518
519int
520create_l2entity(struct mISDNdevice *dev, struct mISDNchannel *ch,
521 u_int protocol, struct sockaddr_mISDN *adr)
522{
523 struct channel_req rq;
524 int err;
525
526 if (*debug & DEBUG_CORE_FUNC)
527 printk(KERN_DEBUG "%s: %s proto(%x) adr(%d %d %d %d)\n",
528 __func__, dev_name(&dev->dev), protocol,
529 adr->dev, adr->channel, adr->sapi,
530 adr->tei);
531 rq.protocol = ISDN_P_TE_S0;
532 if (dev->Dprotocols & (1 << ISDN_P_TE_E1))
533 rq.protocol = ISDN_P_TE_E1;
534 switch (protocol) {
535 case ISDN_P_LAPD_NT:
536 rq.protocol = ISDN_P_NT_S0;
537 if (dev->Dprotocols & (1 << ISDN_P_NT_E1))
538 rq.protocol = ISDN_P_NT_E1;
539 case ISDN_P_LAPD_TE:
540 ch->recv = mISDN_queue_message;
541 ch->peer = &dev->D.st->own;
542 ch->st = dev->D.st;
543 rq.adr.channel = 0;
544 err = dev->D.ctrl(&dev->D, OPEN_CHANNEL, &rq);
545 printk(KERN_DEBUG "%s: ret 1 %d\n", __func__, err);
546 if (err)
547 break;
548 rq.protocol = protocol;
549 rq.adr = *adr;
550 rq.ch = ch;
551 err = dev->teimgr->ctrl(dev->teimgr, OPEN_CHANNEL, &rq);
552 printk(KERN_DEBUG "%s: ret 2 %d\n", __func__, err);
553 if (!err) {
554 if ((protocol == ISDN_P_LAPD_NT) && !rq.ch)
555 break;
556 add_layer2(rq.ch, dev->D.st);
557 rq.ch->recv = mISDN_queue_message;
558 rq.ch->peer = &dev->D.st->own;
559 rq.ch->ctrl(rq.ch, OPEN_CHANNEL, NULL);
560 }
561 break;
562 default:
563 err = -EPROTONOSUPPORT;
564 }
565 return err;
566}
567
568void
569delete_channel(struct mISDNchannel *ch)
570{
571 struct mISDN_sock *msk = container_of(ch, struct mISDN_sock, ch);
572 struct mISDNchannel *pch;
573
574 if (!ch->st) {
575 printk(KERN_WARNING "%s: no stack\n", __func__);
576 return;
577 }
578 if (*debug & DEBUG_CORE_FUNC)
579 printk(KERN_DEBUG "%s: st(%s) protocol(%x)\n", __func__,
580 dev_name(&ch->st->dev->dev), ch->protocol);
581 if (ch->protocol >= ISDN_P_B_START) {
582 if (ch->peer) {
583 ch->peer->ctrl(ch->peer, CLOSE_CHANNEL, NULL);
584 ch->peer = NULL;
585 }
586 return;
587 }
588 switch (ch->protocol) {
589 case ISDN_P_NT_S0:
590 case ISDN_P_TE_S0:
591 case ISDN_P_NT_E1:
592 case ISDN_P_TE_E1:
593 write_lock_bh(&ch->st->l1sock.lock);
594 sk_del_node_init(&msk->sk);
595 write_unlock_bh(&ch->st->l1sock.lock);
596 ch->st->dev->D.ctrl(&ch->st->dev->D, CLOSE_CHANNEL, NULL);
597 break;
598 case ISDN_P_LAPD_TE:
599 pch = get_channel4id(ch->st, ch->nr);
600 if (pch) {
601 mutex_lock(&ch->st->lmutex);
602 list_del(&pch->list);
603 mutex_unlock(&ch->st->lmutex);
604 pch->ctrl(pch, CLOSE_CHANNEL, NULL);
605 pch = ch->st->dev->teimgr;
606 pch->ctrl(pch, CLOSE_CHANNEL, NULL);
607 } else
608 printk(KERN_WARNING "%s: no l2 channel\n",
609 __func__);
610 break;
611 case ISDN_P_LAPD_NT:
612 pch = ch->st->dev->teimgr;
613 if (pch) {
614 pch->ctrl(pch, CLOSE_CHANNEL, NULL);
615 } else
616 printk(KERN_WARNING "%s: no l2 channel\n",
617 __func__);
618 break;
619 default:
620 break;
621 }
622 return;
623}
624
625void
626delete_stack(struct mISDNdevice *dev)
627{
628 struct mISDNstack *st = dev->D.st;
629 DECLARE_COMPLETION_ONSTACK(done);
630
631 if (*debug & DEBUG_CORE_FUNC)
632 printk(KERN_DEBUG "%s: st(%s)\n", __func__,
633 dev_name(&st->dev->dev));
634 if (dev->teimgr)
635 delete_teimanager(dev->teimgr);
636 if (st->thread) {
637 if (st->notify) {
638 printk(KERN_WARNING "%s: notifier in use\n",
639 __func__);
640 complete(st->notify);
641 }
642 st->notify = &done;
643 test_and_set_bit(mISDN_STACK_ABORT, &st->status);
644 test_and_set_bit(mISDN_STACK_WAKEUP, &st->status);
645 wake_up_interruptible(&st->workq);
646 wait_for_completion(&done);
647 }
648 if (!list_empty(&st->layer2))
649 printk(KERN_WARNING "%s: layer2 list not empty\n",
650 __func__);
651 if (!hlist_empty(&st->l1sock.head))
652 printk(KERN_WARNING "%s: layer1 list not empty\n",
653 __func__);
654 kfree(st);
655}
656
657void
658mISDN_initstack(u_int *dp)
659{
660 debug = dp;
661}
662
