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Merge tag 'mm-hotfixes-stable-2025-07-11-16-16' of git://git.kernel.org/pub/scm/linux...
[linux-2.6-block.git] / drivers / isdn / capi / capi.c
... / ...
CommitLineData
1/* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
2 *
3 * CAPI 2.0 Interface for Linux
4 *
5 * Copyright 1996 by Carsten Paeth <calle@calle.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/compiler.h>
13#include <linux/module.h>
14#include <linux/ethtool.h>
15#include <linux/errno.h>
16#include <linux/kernel.h>
17#include <linux/major.h>
18#include <linux/sched.h>
19#include <linux/slab.h>
20#include <linux/fcntl.h>
21#include <linux/fs.h>
22#include <linux/signal.h>
23#include <linux/mutex.h>
24#include <linux/mm.h>
25#include <linux/timer.h>
26#include <linux/wait.h>
27#include <linux/tty.h>
28#include <linux/netdevice.h>
29#include <linux/ppp_defs.h>
30#include <linux/ppp-ioctl.h>
31#include <linux/skbuff.h>
32#include <linux/proc_fs.h>
33#include <linux/seq_file.h>
34#include <linux/poll.h>
35#include <linux/capi.h>
36#include <linux/kernelcapi.h>
37#include <linux/init.h>
38#include <linux/device.h>
39#include <linux/moduleparam.h>
40#include <linux/isdn/capiutil.h>
41#include <linux/isdn/capicmd.h>
42
43#include "kcapi.h"
44
45MODULE_DESCRIPTION("CAPI4Linux: kernel CAPI layer and /dev/capi20 interface");
46MODULE_AUTHOR("Carsten Paeth");
47MODULE_LICENSE("GPL");
48
49/* -------- driver information -------------------------------------- */
50
51static DEFINE_MUTEX(capi_mutex);
52static const struct class capi_class = {
53 .name = "capi",
54};
55static int capi_major = 68; /* allocated */
56
57module_param_named(major, capi_major, uint, 0);
58
59#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
60#define CAPINC_NR_PORTS 32
61#define CAPINC_MAX_PORTS 256
62
63static int capi_ttyminors = CAPINC_NR_PORTS;
64
65module_param_named(ttyminors, capi_ttyminors, uint, 0);
66#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
67
68/* -------- defines ------------------------------------------------- */
69
70#define CAPINC_MAX_RECVQUEUE 10
71#define CAPINC_MAX_SENDQUEUE 10
72#define CAPI_MAX_BLKSIZE 2048
73
74/* -------- data structures ----------------------------------------- */
75
76struct capidev;
77struct capincci;
78struct capiminor;
79
80struct ackqueue_entry {
81 struct list_head list;
82 u16 datahandle;
83};
84
85struct capiminor {
86 unsigned int minor;
87
88 struct capi20_appl *ap;
89 u32 ncci;
90 atomic_t datahandle;
91 atomic_t msgid;
92
93 struct tty_port port;
94 int ttyinstop;
95 int ttyoutstop;
96
97 struct sk_buff_head inqueue;
98
99 struct sk_buff_head outqueue;
100 int outbytes;
101 struct sk_buff *outskb;
102 spinlock_t outlock;
103
104 /* transmit path */
105 struct list_head ackqueue;
106 int nack;
107 spinlock_t ackqlock;
108};
109
110struct capincci {
111 struct list_head list;
112 u32 ncci;
113 struct capidev *cdev;
114#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
115 struct capiminor *minorp;
116#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
117};
118
119struct capidev {
120 struct list_head list;
121 struct capi20_appl ap;
122 u16 errcode;
123 unsigned userflags;
124
125 struct sk_buff_head recvqueue;
126 wait_queue_head_t recvwait;
127
128 struct list_head nccis;
129
130 struct mutex lock;
131};
132
133/* -------- global variables ---------------------------------------- */
134
135static DEFINE_MUTEX(capidev_list_lock);
136static LIST_HEAD(capidev_list);
137
138#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
139
140static DEFINE_SPINLOCK(capiminors_lock);
141static struct capiminor **capiminors;
142
143static struct tty_driver *capinc_tty_driver;
144
145/* -------- datahandles --------------------------------------------- */
146
147static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
148{
149 struct ackqueue_entry *n;
150
151 n = kmalloc(sizeof(*n), GFP_ATOMIC);
152 if (unlikely(!n)) {
153 printk(KERN_ERR "capi: alloc datahandle failed\n");
154 return -1;
155 }
156 n->datahandle = datahandle;
157 INIT_LIST_HEAD(&n->list);
158 spin_lock_bh(&mp->ackqlock);
159 list_add_tail(&n->list, &mp->ackqueue);
160 mp->nack++;
161 spin_unlock_bh(&mp->ackqlock);
162 return 0;
163}
164
165static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
166{
167 struct ackqueue_entry *p, *tmp;
168
169 spin_lock_bh(&mp->ackqlock);
170 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
171 if (p->datahandle == datahandle) {
172 list_del(&p->list);
173 mp->nack--;
174 spin_unlock_bh(&mp->ackqlock);
175 kfree(p);
176 return 0;
177 }
178 }
179 spin_unlock_bh(&mp->ackqlock);
180 return -1;
181}
182
183static void capiminor_del_all_ack(struct capiminor *mp)
184{
185 struct ackqueue_entry *p, *tmp;
186
187 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
188 list_del(&p->list);
189 kfree(p);
190 mp->nack--;
191 }
192}
193
194
195/* -------- struct capiminor ---------------------------------------- */
196
197static void capiminor_destroy(struct tty_port *port)
198{
199 struct capiminor *mp = container_of(port, struct capiminor, port);
200
201 kfree_skb(mp->outskb);
202 skb_queue_purge(&mp->inqueue);
203 skb_queue_purge(&mp->outqueue);
204 capiminor_del_all_ack(mp);
205 kfree(mp);
206}
207
208static const struct tty_port_operations capiminor_port_ops = {
209 .destruct = capiminor_destroy,
210};
211
212static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
213{
214 struct capiminor *mp;
215 struct device *dev;
216 unsigned int minor;
217
218 mp = kzalloc(sizeof(*mp), GFP_KERNEL);
219 if (!mp) {
220 printk(KERN_ERR "capi: can't alloc capiminor\n");
221 return NULL;
222 }
223
224 mp->ap = ap;
225 mp->ncci = ncci;
226 INIT_LIST_HEAD(&mp->ackqueue);
227 spin_lock_init(&mp->ackqlock);
228
229 skb_queue_head_init(&mp->inqueue);
230 skb_queue_head_init(&mp->outqueue);
231 spin_lock_init(&mp->outlock);
232
233 tty_port_init(&mp->port);
234 mp->port.ops = &capiminor_port_ops;
235
236 /* Allocate the least unused minor number. */
237 spin_lock(&capiminors_lock);
238 for (minor = 0; minor < capi_ttyminors; minor++)
239 if (!capiminors[minor]) {
240 capiminors[minor] = mp;
241 break;
242 }
243 spin_unlock(&capiminors_lock);
244
245 if (minor == capi_ttyminors) {
246 printk(KERN_NOTICE "capi: out of minors\n");
247 goto err_out1;
248 }
249
250 mp->minor = minor;
251
252 dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor,
253 NULL);
254 if (IS_ERR(dev))
255 goto err_out2;
256
257 return mp;
258
259err_out2:
260 spin_lock(&capiminors_lock);
261 capiminors[minor] = NULL;
262 spin_unlock(&capiminors_lock);
263
264err_out1:
265 tty_port_put(&mp->port);
266 return NULL;
267}
268
269static struct capiminor *capiminor_get(unsigned int minor)
270{
271 struct capiminor *mp;
272
273 spin_lock(&capiminors_lock);
274 mp = capiminors[minor];
275 if (mp)
276 tty_port_get(&mp->port);
277 spin_unlock(&capiminors_lock);
278
279 return mp;
280}
281
282static inline void capiminor_put(struct capiminor *mp)
283{
284 tty_port_put(&mp->port);
285}
286
287static void capiminor_free(struct capiminor *mp)
288{
289 tty_unregister_device(capinc_tty_driver, mp->minor);
290
291 spin_lock(&capiminors_lock);
292 capiminors[mp->minor] = NULL;
293 spin_unlock(&capiminors_lock);
294
295 capiminor_put(mp);
296}
297
298/* -------- struct capincci ----------------------------------------- */
299
300static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
301{
302 if (cdev->userflags & CAPIFLAG_HIGHJACKING)
303 np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
304}
305
306static void capincci_free_minor(struct capincci *np)
307{
308 struct capiminor *mp = np->minorp;
309 struct tty_struct *tty;
310
311 if (mp) {
312 tty = tty_port_tty_get(&mp->port);
313 if (tty) {
314 tty_vhangup(tty);
315 tty_kref_put(tty);
316 }
317
318 capiminor_free(mp);
319 }
320}
321
322static inline unsigned int capincci_minor_opencount(struct capincci *np)
323{
324 struct capiminor *mp = np->minorp;
325 unsigned int count = 0;
326 struct tty_struct *tty;
327
328 if (mp) {
329 tty = tty_port_tty_get(&mp->port);
330 if (tty) {
331 count = tty->count;
332 tty_kref_put(tty);
333 }
334 }
335 return count;
336}
337
338#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
339
340static inline void
341capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
342static inline void capincci_free_minor(struct capincci *np) { }
343
344#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
345
346static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
347{
348 struct capincci *np;
349
350 np = kzalloc(sizeof(*np), GFP_KERNEL);
351 if (!np)
352 return NULL;
353 np->ncci = ncci;
354 np->cdev = cdev;
355
356 capincci_alloc_minor(cdev, np);
357
358 list_add_tail(&np->list, &cdev->nccis);
359
360 return np;
361}
362
363static void capincci_free(struct capidev *cdev, u32 ncci)
364{
365 struct capincci *np, *tmp;
366
367 list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
368 if (ncci == 0xffffffff || np->ncci == ncci) {
369 capincci_free_minor(np);
370 list_del(&np->list);
371 kfree(np);
372 }
373}
374
375#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
376static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
377{
378 struct capincci *np;
379
380 list_for_each_entry(np, &cdev->nccis, list)
381 if (np->ncci == ncci)
382 return np;
383 return NULL;
384}
385
386/* -------- handle data queue --------------------------------------- */
387
388static struct sk_buff *
389gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
390{
391 struct sk_buff *nskb;
392 nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
393 if (nskb) {
394 u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
395 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
396 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
397 capimsg_setu16(s, 2, mp->ap->applid);
398 capimsg_setu8 (s, 4, CAPI_DATA_B3);
399 capimsg_setu8 (s, 5, CAPI_RESP);
400 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
401 capimsg_setu32(s, 8, mp->ncci);
402 capimsg_setu16(s, 12, datahandle);
403 }
404 return nskb;
405}
406
407static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
408{
409 unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
410 struct tty_struct *tty;
411 struct sk_buff *nskb;
412 u16 errcode, datahandle;
413 struct tty_ldisc *ld;
414 int ret = -1;
415
416 tty = tty_port_tty_get(&mp->port);
417 if (!tty) {
418 pr_debug("capi: currently no receiver\n");
419 return -1;
420 }
421
422 ld = tty_ldisc_ref(tty);
423 if (!ld) {
424 /* fatal error, do not requeue */
425 ret = 0;
426 kfree_skb(skb);
427 goto deref_tty;
428 }
429
430 if (ld->ops->receive_buf == NULL) {
431 pr_debug("capi: ldisc has no receive_buf function\n");
432 /* fatal error, do not requeue */
433 goto free_skb;
434 }
435 if (mp->ttyinstop) {
436 pr_debug("capi: recv tty throttled\n");
437 goto deref_ldisc;
438 }
439
440 if (tty->receive_room < datalen) {
441 pr_debug("capi: no room in tty\n");
442 goto deref_ldisc;
443 }
444
445 nskb = gen_data_b3_resp_for(mp, skb);
446 if (!nskb) {
447 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
448 goto deref_ldisc;
449 }
450
451 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
452
453 errcode = capi20_put_message(mp->ap, nskb);
454
455 if (errcode == CAPI_NOERROR) {
456 skb_pull(skb, CAPIMSG_LEN(skb->data));
457 pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
458 datahandle, skb->len);
459 ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
460 } else {
461 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
462 errcode);
463 kfree_skb(nskb);
464
465 if (errcode == CAPI_SENDQUEUEFULL)
466 goto deref_ldisc;
467 }
468
469free_skb:
470 ret = 0;
471 kfree_skb(skb);
472
473deref_ldisc:
474 tty_ldisc_deref(ld);
475
476deref_tty:
477 tty_kref_put(tty);
478 return ret;
479}
480
481static void handle_minor_recv(struct capiminor *mp)
482{
483 struct sk_buff *skb;
484
485 while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
486 if (handle_recv_skb(mp, skb) < 0) {
487 skb_queue_head(&mp->inqueue, skb);
488 return;
489 }
490}
491
492static void handle_minor_send(struct capiminor *mp)
493{
494 struct tty_struct *tty;
495 struct sk_buff *skb;
496 u16 len;
497 u16 errcode;
498 u16 datahandle;
499
500 tty = tty_port_tty_get(&mp->port);
501 if (!tty)
502 return;
503
504 if (mp->ttyoutstop) {
505 pr_debug("capi: send: tty stopped\n");
506 tty_kref_put(tty);
507 return;
508 }
509
510 while (1) {
511 spin_lock_bh(&mp->outlock);
512 skb = __skb_dequeue(&mp->outqueue);
513 if (!skb) {
514 spin_unlock_bh(&mp->outlock);
515 break;
516 }
517 len = (u16)skb->len;
518 mp->outbytes -= len;
519 spin_unlock_bh(&mp->outlock);
520
521 datahandle = atomic_inc_return(&mp->datahandle);
522 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
523 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
524 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
525 capimsg_setu16(skb->data, 2, mp->ap->applid);
526 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
527 capimsg_setu8 (skb->data, 5, CAPI_REQ);
528 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
529 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
530 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
531 capimsg_setu16(skb->data, 16, len); /* Data length */
532 capimsg_setu16(skb->data, 18, datahandle);
533 capimsg_setu16(skb->data, 20, 0); /* Flags */
534
535 if (capiminor_add_ack(mp, datahandle) < 0) {
536 skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
537
538 spin_lock_bh(&mp->outlock);
539 __skb_queue_head(&mp->outqueue, skb);
540 mp->outbytes += len;
541 spin_unlock_bh(&mp->outlock);
542
543 break;
544 }
545 errcode = capi20_put_message(mp->ap, skb);
546 if (errcode == CAPI_NOERROR) {
547 pr_debug("capi: DATA_B3_REQ %u len=%u\n",
548 datahandle, len);
549 continue;
550 }
551 capiminor_del_ack(mp, datahandle);
552
553 if (errcode == CAPI_SENDQUEUEFULL) {
554 skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
555
556 spin_lock_bh(&mp->outlock);
557 __skb_queue_head(&mp->outqueue, skb);
558 mp->outbytes += len;
559 spin_unlock_bh(&mp->outlock);
560
561 break;
562 }
563
564 /* ups, drop packet */
565 printk(KERN_ERR "capi: put_message = %x\n", errcode);
566 kfree_skb(skb);
567 }
568 tty_kref_put(tty);
569}
570
571#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
572/* -------- function called by lower level -------------------------- */
573
574static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
575{
576 struct capidev *cdev = ap->private;
577#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
578 struct capiminor *mp;
579 u16 datahandle;
580 struct capincci *np;
581#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
582
583 mutex_lock(&cdev->lock);
584
585 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
586 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
587 if ((info & 0xff00) == 0)
588 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
589 }
590 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
591 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
592
593 if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
594 skb_queue_tail(&cdev->recvqueue, skb);
595 wake_up_interruptible(&cdev->recvwait);
596 goto unlock_out;
597 }
598
599#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
600 skb_queue_tail(&cdev->recvqueue, skb);
601 wake_up_interruptible(&cdev->recvwait);
602
603#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
604
605 np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
606 if (!np) {
607 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
608 skb_queue_tail(&cdev->recvqueue, skb);
609 wake_up_interruptible(&cdev->recvwait);
610 goto unlock_out;
611 }
612
613 mp = np->minorp;
614 if (!mp) {
615 skb_queue_tail(&cdev->recvqueue, skb);
616 wake_up_interruptible(&cdev->recvwait);
617 goto unlock_out;
618 }
619 if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
620 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
621 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
622 datahandle, skb->len-CAPIMSG_LEN(skb->data));
623 skb_queue_tail(&mp->inqueue, skb);
624
625 handle_minor_recv(mp);
626
627 } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
628
629 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
630 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
631 datahandle,
632 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
633 kfree_skb(skb);
634 capiminor_del_ack(mp, datahandle);
635 tty_port_tty_wakeup(&mp->port);
636 handle_minor_send(mp);
637
638 } else {
639 /* ups, let capi application handle it :-) */
640 skb_queue_tail(&cdev->recvqueue, skb);
641 wake_up_interruptible(&cdev->recvwait);
642 }
643#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
644
645unlock_out:
646 mutex_unlock(&cdev->lock);
647}
648
649/* -------- file_operations for capidev ----------------------------- */
650
651static ssize_t
652capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
653{
654 struct capidev *cdev = file->private_data;
655 struct sk_buff *skb;
656 size_t copied;
657 int err;
658
659 if (!cdev->ap.applid)
660 return -ENODEV;
661
662 skb = skb_dequeue(&cdev->recvqueue);
663 if (!skb) {
664 if (file->f_flags & O_NONBLOCK)
665 return -EAGAIN;
666 err = wait_event_interruptible(cdev->recvwait,
667 (skb = skb_dequeue(&cdev->recvqueue)));
668 if (err)
669 return err;
670 }
671 if (skb->len > count) {
672 skb_queue_head(&cdev->recvqueue, skb);
673 return -EMSGSIZE;
674 }
675 if (copy_to_user(buf, skb->data, skb->len)) {
676 skb_queue_head(&cdev->recvqueue, skb);
677 return -EFAULT;
678 }
679 copied = skb->len;
680
681 kfree_skb(skb);
682
683 return copied;
684}
685
686static ssize_t
687capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
688{
689 struct capidev *cdev = file->private_data;
690 struct sk_buff *skb;
691 u16 mlen;
692
693 if (!cdev->ap.applid)
694 return -ENODEV;
695
696 if (count < CAPIMSG_BASELEN)
697 return -EINVAL;
698
699 skb = alloc_skb(count, GFP_USER);
700 if (!skb)
701 return -ENOMEM;
702
703 if (copy_from_user(skb_put(skb, count), buf, count)) {
704 kfree_skb(skb);
705 return -EFAULT;
706 }
707 mlen = CAPIMSG_LEN(skb->data);
708 if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
709 if (count < CAPI_DATA_B3_REQ_LEN ||
710 (size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
711 kfree_skb(skb);
712 return -EINVAL;
713 }
714 } else {
715 if (mlen != count) {
716 kfree_skb(skb);
717 return -EINVAL;
718 }
719 }
720 CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
721
722 if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
723 if (count < CAPI_DISCONNECT_B3_RESP_LEN) {
724 kfree_skb(skb);
725 return -EINVAL;
726 }
727 mutex_lock(&cdev->lock);
728 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
729 mutex_unlock(&cdev->lock);
730 }
731
732 cdev->errcode = capi20_put_message(&cdev->ap, skb);
733
734 if (cdev->errcode) {
735 kfree_skb(skb);
736 return -EIO;
737 }
738 return count;
739}
740
741static __poll_t
742capi_poll(struct file *file, poll_table *wait)
743{
744 struct capidev *cdev = file->private_data;
745 __poll_t mask = 0;
746
747 if (!cdev->ap.applid)
748 return EPOLLERR;
749
750 poll_wait(file, &(cdev->recvwait), wait);
751 mask = EPOLLOUT | EPOLLWRNORM;
752 if (!skb_queue_empty_lockless(&cdev->recvqueue))
753 mask |= EPOLLIN | EPOLLRDNORM;
754 return mask;
755}
756
757static int
758capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
759{
760 struct capidev *cdev = file->private_data;
761 capi_ioctl_struct data;
762 int retval = -EINVAL;
763 void __user *argp = (void __user *)arg;
764
765 switch (cmd) {
766 case CAPI_REGISTER:
767 mutex_lock(&cdev->lock);
768
769 if (cdev->ap.applid) {
770 retval = -EEXIST;
771 goto register_out;
772 }
773 if (copy_from_user(&cdev->ap.rparam, argp,
774 sizeof(struct capi_register_params))) {
775 retval = -EFAULT;
776 goto register_out;
777 }
778 cdev->ap.private = cdev;
779 cdev->ap.recv_message = capi_recv_message;
780 cdev->errcode = capi20_register(&cdev->ap);
781 retval = (int)cdev->ap.applid;
782 if (cdev->errcode) {
783 cdev->ap.applid = 0;
784 retval = -EIO;
785 }
786
787register_out:
788 mutex_unlock(&cdev->lock);
789 return retval;
790
791 case CAPI_GET_VERSION:
792 if (copy_from_user(&data.contr, argp,
793 sizeof(data.contr)))
794 return -EFAULT;
795 cdev->errcode = capi20_get_version(data.contr, &data.version);
796 if (cdev->errcode)
797 return -EIO;
798 if (copy_to_user(argp, &data.version,
799 sizeof(data.version)))
800 return -EFAULT;
801 return 0;
802
803 case CAPI_GET_SERIAL:
804 if (copy_from_user(&data.contr, argp,
805 sizeof(data.contr)))
806 return -EFAULT;
807 cdev->errcode = capi20_get_serial(data.contr, data.serial);
808 if (cdev->errcode)
809 return -EIO;
810 if (copy_to_user(argp, data.serial,
811 sizeof(data.serial)))
812 return -EFAULT;
813 return 0;
814
815 case CAPI_GET_PROFILE:
816 if (copy_from_user(&data.contr, argp,
817 sizeof(data.contr)))
818 return -EFAULT;
819
820 if (data.contr == 0) {
821 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
822 if (cdev->errcode)
823 return -EIO;
824
825 retval = copy_to_user(argp,
826 &data.profile.ncontroller,
827 sizeof(data.profile.ncontroller));
828
829 } else {
830 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
831 if (cdev->errcode)
832 return -EIO;
833
834 retval = copy_to_user(argp, &data.profile,
835 sizeof(data.profile));
836 }
837 if (retval)
838 return -EFAULT;
839 return 0;
840
841 case CAPI_GET_MANUFACTURER:
842 if (copy_from_user(&data.contr, argp,
843 sizeof(data.contr)))
844 return -EFAULT;
845 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
846 if (cdev->errcode)
847 return -EIO;
848
849 if (copy_to_user(argp, data.manufacturer,
850 sizeof(data.manufacturer)))
851 return -EFAULT;
852
853 return 0;
854
855 case CAPI_GET_ERRCODE:
856 data.errcode = cdev->errcode;
857 cdev->errcode = CAPI_NOERROR;
858 if (arg) {
859 if (copy_to_user(argp, &data.errcode,
860 sizeof(data.errcode)))
861 return -EFAULT;
862 }
863 return data.errcode;
864
865 case CAPI_INSTALLED:
866 if (capi20_isinstalled() == CAPI_NOERROR)
867 return 0;
868 return -ENXIO;
869
870 case CAPI_MANUFACTURER_CMD: {
871 struct capi_manufacturer_cmd mcmd;
872 if (!capable(CAP_SYS_ADMIN))
873 return -EPERM;
874 if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
875 return -EFAULT;
876 return capi20_manufacturer(mcmd.cmd, mcmd.data);
877 }
878 case CAPI_SET_FLAGS:
879 case CAPI_CLR_FLAGS: {
880 unsigned userflags;
881
882 if (copy_from_user(&userflags, argp, sizeof(userflags)))
883 return -EFAULT;
884
885 mutex_lock(&cdev->lock);
886 if (cmd == CAPI_SET_FLAGS)
887 cdev->userflags |= userflags;
888 else
889 cdev->userflags &= ~userflags;
890 mutex_unlock(&cdev->lock);
891 return 0;
892 }
893 case CAPI_GET_FLAGS:
894 if (copy_to_user(argp, &cdev->userflags,
895 sizeof(cdev->userflags)))
896 return -EFAULT;
897 return 0;
898
899#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
900 case CAPI_NCCI_OPENCOUNT:
901 return 0;
902
903#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
904 case CAPI_NCCI_OPENCOUNT: {
905 struct capincci *nccip;
906 unsigned ncci;
907 int count = 0;
908
909 if (copy_from_user(&ncci, argp, sizeof(ncci)))
910 return -EFAULT;
911
912 mutex_lock(&cdev->lock);
913 nccip = capincci_find(cdev, (u32)ncci);
914 if (nccip)
915 count = capincci_minor_opencount(nccip);
916 mutex_unlock(&cdev->lock);
917 return count;
918 }
919
920 case CAPI_NCCI_GETUNIT: {
921 struct capincci *nccip;
922 struct capiminor *mp;
923 unsigned ncci;
924 int unit = -ESRCH;
925
926 if (copy_from_user(&ncci, argp, sizeof(ncci)))
927 return -EFAULT;
928
929 mutex_lock(&cdev->lock);
930 nccip = capincci_find(cdev, (u32)ncci);
931 if (nccip) {
932 mp = nccip->minorp;
933 if (mp)
934 unit = mp->minor;
935 }
936 mutex_unlock(&cdev->lock);
937 return unit;
938 }
939#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
940
941 default:
942 return -EINVAL;
943 }
944}
945
946static long
947capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
948{
949 int ret;
950
951 mutex_lock(&capi_mutex);
952 ret = capi_ioctl(file, cmd, arg);
953 mutex_unlock(&capi_mutex);
954
955 return ret;
956}
957
958#ifdef CONFIG_COMPAT
959static long
960capi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
961{
962 int ret;
963
964 if (cmd == CAPI_MANUFACTURER_CMD) {
965 struct {
966 compat_ulong_t cmd;
967 compat_uptr_t data;
968 } mcmd32;
969
970 if (!capable(CAP_SYS_ADMIN))
971 return -EPERM;
972 if (copy_from_user(&mcmd32, compat_ptr(arg), sizeof(mcmd32)))
973 return -EFAULT;
974
975 mutex_lock(&capi_mutex);
976 ret = capi20_manufacturer(mcmd32.cmd, compat_ptr(mcmd32.data));
977 mutex_unlock(&capi_mutex);
978
979 return ret;
980 }
981
982 return capi_unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
983}
984#endif
985
986static int capi_open(struct inode *inode, struct file *file)
987{
988 struct capidev *cdev;
989
990 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
991 if (!cdev)
992 return -ENOMEM;
993
994 mutex_init(&cdev->lock);
995 skb_queue_head_init(&cdev->recvqueue);
996 init_waitqueue_head(&cdev->recvwait);
997 INIT_LIST_HEAD(&cdev->nccis);
998 file->private_data = cdev;
999
1000 mutex_lock(&capidev_list_lock);
1001 list_add_tail(&cdev->list, &capidev_list);
1002 mutex_unlock(&capidev_list_lock);
1003
1004 return stream_open(inode, file);
1005}
1006
1007static int capi_release(struct inode *inode, struct file *file)
1008{
1009 struct capidev *cdev = file->private_data;
1010
1011 mutex_lock(&capidev_list_lock);
1012 list_del(&cdev->list);
1013 mutex_unlock(&capidev_list_lock);
1014
1015 if (cdev->ap.applid)
1016 capi20_release(&cdev->ap);
1017 skb_queue_purge(&cdev->recvqueue);
1018 capincci_free(cdev, 0xffffffff);
1019
1020 kfree(cdev);
1021 return 0;
1022}
1023
1024static const struct file_operations capi_fops =
1025{
1026 .owner = THIS_MODULE,
1027 .read = capi_read,
1028 .write = capi_write,
1029 .poll = capi_poll,
1030 .unlocked_ioctl = capi_unlocked_ioctl,
1031#ifdef CONFIG_COMPAT
1032 .compat_ioctl = capi_compat_ioctl,
1033#endif
1034 .open = capi_open,
1035 .release = capi_release,
1036};
1037
1038#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1039/* -------- tty_operations for capincci ----------------------------- */
1040
1041static int
1042capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1043{
1044 struct capiminor *mp = capiminor_get(tty->index);
1045 int ret = tty_standard_install(driver, tty);
1046
1047 if (ret == 0)
1048 tty->driver_data = mp;
1049 else
1050 capiminor_put(mp);
1051 return ret;
1052}
1053
1054static void capinc_tty_cleanup(struct tty_struct *tty)
1055{
1056 struct capiminor *mp = tty->driver_data;
1057 tty->driver_data = NULL;
1058 capiminor_put(mp);
1059}
1060
1061static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1062{
1063 struct capiminor *mp = tty->driver_data;
1064 int err;
1065
1066 err = tty_port_open(&mp->port, tty, filp);
1067 if (err)
1068 return err;
1069
1070 handle_minor_recv(mp);
1071 return 0;
1072}
1073
1074static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1075{
1076 struct capiminor *mp = tty->driver_data;
1077
1078 tty_port_close(&mp->port, tty, filp);
1079}
1080
1081static ssize_t capinc_tty_write(struct tty_struct *tty, const u8 *buf,
1082 size_t count)
1083{
1084 struct capiminor *mp = tty->driver_data;
1085 struct sk_buff *skb;
1086
1087 pr_debug("capinc_tty_write(count=%zu)\n", count);
1088
1089 spin_lock_bh(&mp->outlock);
1090 skb = mp->outskb;
1091 if (skb) {
1092 mp->outskb = NULL;
1093 __skb_queue_tail(&mp->outqueue, skb);
1094 mp->outbytes += skb->len;
1095 }
1096
1097 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
1098 if (!skb) {
1099 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1100 spin_unlock_bh(&mp->outlock);
1101 return -ENOMEM;
1102 }
1103
1104 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1105 skb_put_data(skb, buf, count);
1106
1107 __skb_queue_tail(&mp->outqueue, skb);
1108 mp->outbytes += skb->len;
1109 spin_unlock_bh(&mp->outlock);
1110
1111 handle_minor_send(mp);
1112
1113 return count;
1114}
1115
1116static int capinc_tty_put_char(struct tty_struct *tty, u8 ch)
1117{
1118 struct capiminor *mp = tty->driver_data;
1119 bool invoke_send = false;
1120 struct sk_buff *skb;
1121 int ret = 1;
1122
1123 pr_debug("capinc_put_char(%u)\n", ch);
1124
1125 spin_lock_bh(&mp->outlock);
1126 skb = mp->outskb;
1127 if (skb) {
1128 if (skb_tailroom(skb) > 0) {
1129 skb_put_u8(skb, ch);
1130 goto unlock_out;
1131 }
1132 mp->outskb = NULL;
1133 __skb_queue_tail(&mp->outqueue, skb);
1134 mp->outbytes += skb->len;
1135 invoke_send = true;
1136 }
1137
1138 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1139 if (skb) {
1140 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1141 skb_put_u8(skb, ch);
1142 mp->outskb = skb;
1143 } else {
1144 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1145 ret = 0;
1146 }
1147
1148unlock_out:
1149 spin_unlock_bh(&mp->outlock);
1150
1151 if (invoke_send)
1152 handle_minor_send(mp);
1153
1154 return ret;
1155}
1156
1157static void capinc_tty_flush_chars(struct tty_struct *tty)
1158{
1159 struct capiminor *mp = tty->driver_data;
1160 struct sk_buff *skb;
1161
1162 spin_lock_bh(&mp->outlock);
1163 skb = mp->outskb;
1164 if (skb) {
1165 mp->outskb = NULL;
1166 __skb_queue_tail(&mp->outqueue, skb);
1167 mp->outbytes += skb->len;
1168 spin_unlock_bh(&mp->outlock);
1169
1170 handle_minor_send(mp);
1171 } else
1172 spin_unlock_bh(&mp->outlock);
1173
1174 handle_minor_recv(mp);
1175}
1176
1177static unsigned int capinc_tty_write_room(struct tty_struct *tty)
1178{
1179 struct capiminor *mp = tty->driver_data;
1180 unsigned int room;
1181
1182 room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1183 room *= CAPI_MAX_BLKSIZE;
1184 pr_debug("capinc_tty_write_room = %u\n", room);
1185 return room;
1186}
1187
1188static unsigned int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1189{
1190 struct capiminor *mp = tty->driver_data;
1191
1192 pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1193 mp->outbytes, mp->nack,
1194 skb_queue_len(&mp->outqueue),
1195 skb_queue_len(&mp->inqueue));
1196 return mp->outbytes;
1197}
1198
1199static void capinc_tty_throttle(struct tty_struct *tty)
1200{
1201 struct capiminor *mp = tty->driver_data;
1202 mp->ttyinstop = 1;
1203}
1204
1205static void capinc_tty_unthrottle(struct tty_struct *tty)
1206{
1207 struct capiminor *mp = tty->driver_data;
1208
1209 mp->ttyinstop = 0;
1210 handle_minor_recv(mp);
1211}
1212
1213static void capinc_tty_stop(struct tty_struct *tty)
1214{
1215 struct capiminor *mp = tty->driver_data;
1216
1217 mp->ttyoutstop = 1;
1218}
1219
1220static void capinc_tty_start(struct tty_struct *tty)
1221{
1222 struct capiminor *mp = tty->driver_data;
1223
1224 mp->ttyoutstop = 0;
1225 handle_minor_send(mp);
1226}
1227
1228static void capinc_tty_hangup(struct tty_struct *tty)
1229{
1230 struct capiminor *mp = tty->driver_data;
1231
1232 tty_port_hangup(&mp->port);
1233}
1234
1235static void capinc_tty_send_xchar(struct tty_struct *tty, u8 ch)
1236{
1237 pr_debug("capinc_tty_send_xchar(%u)\n", ch);
1238}
1239
1240static const struct tty_operations capinc_ops = {
1241 .open = capinc_tty_open,
1242 .close = capinc_tty_close,
1243 .write = capinc_tty_write,
1244 .put_char = capinc_tty_put_char,
1245 .flush_chars = capinc_tty_flush_chars,
1246 .write_room = capinc_tty_write_room,
1247 .chars_in_buffer = capinc_tty_chars_in_buffer,
1248 .throttle = capinc_tty_throttle,
1249 .unthrottle = capinc_tty_unthrottle,
1250 .stop = capinc_tty_stop,
1251 .start = capinc_tty_start,
1252 .hangup = capinc_tty_hangup,
1253 .send_xchar = capinc_tty_send_xchar,
1254 .install = capinc_tty_install,
1255 .cleanup = capinc_tty_cleanup,
1256};
1257
1258static int __init capinc_tty_init(void)
1259{
1260 struct tty_driver *drv;
1261 int err;
1262
1263 if (capi_ttyminors > CAPINC_MAX_PORTS)
1264 capi_ttyminors = CAPINC_MAX_PORTS;
1265 if (capi_ttyminors <= 0)
1266 capi_ttyminors = CAPINC_NR_PORTS;
1267
1268 capiminors = kcalloc(capi_ttyminors, sizeof(struct capiminor *),
1269 GFP_KERNEL);
1270 if (!capiminors)
1271 return -ENOMEM;
1272
1273 drv = tty_alloc_driver(capi_ttyminors, TTY_DRIVER_REAL_RAW |
1274 TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV);
1275 if (IS_ERR(drv)) {
1276 kfree(capiminors);
1277 return PTR_ERR(drv);
1278 }
1279 drv->driver_name = "capi_nc";
1280 drv->name = "capi!";
1281 drv->major = 0;
1282 drv->minor_start = 0;
1283 drv->type = TTY_DRIVER_TYPE_SERIAL;
1284 drv->subtype = SERIAL_TYPE_NORMAL;
1285 drv->init_termios = tty_std_termios;
1286 drv->init_termios.c_iflag = ICRNL;
1287 drv->init_termios.c_oflag = OPOST | ONLCR;
1288 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1289 drv->init_termios.c_lflag = 0;
1290 tty_set_operations(drv, &capinc_ops);
1291
1292 err = tty_register_driver(drv);
1293 if (err) {
1294 tty_driver_kref_put(drv);
1295 kfree(capiminors);
1296 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1297 return err;
1298 }
1299 capinc_tty_driver = drv;
1300 return 0;
1301}
1302
1303static void __exit capinc_tty_exit(void)
1304{
1305 tty_unregister_driver(capinc_tty_driver);
1306 tty_driver_kref_put(capinc_tty_driver);
1307 kfree(capiminors);
1308}
1309
1310#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1311
1312static inline int capinc_tty_init(void)
1313{
1314 return 0;
1315}
1316
1317static inline void capinc_tty_exit(void) { }
1318
1319#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1320
1321/* -------- /proc functions ----------------------------------------- */
1322
1323/*
1324 * /proc/capi/capi20:
1325 * minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1326 */
1327static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v)
1328{
1329 struct capidev *cdev;
1330 struct list_head *l;
1331
1332 mutex_lock(&capidev_list_lock);
1333 list_for_each(l, &capidev_list) {
1334 cdev = list_entry(l, struct capidev, list);
1335 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1336 cdev->ap.applid,
1337 cdev->ap.nrecvctlpkt,
1338 cdev->ap.nrecvdatapkt,
1339 cdev->ap.nsentctlpkt,
1340 cdev->ap.nsentdatapkt);
1341 }
1342 mutex_unlock(&capidev_list_lock);
1343 return 0;
1344}
1345
1346/*
1347 * /proc/capi/capi20ncci:
1348 * applid ncci
1349 */
1350static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v)
1351{
1352 struct capidev *cdev;
1353 struct capincci *np;
1354
1355 mutex_lock(&capidev_list_lock);
1356 list_for_each_entry(cdev, &capidev_list, list) {
1357 mutex_lock(&cdev->lock);
1358 list_for_each_entry(np, &cdev->nccis, list)
1359 seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1360 mutex_unlock(&cdev->lock);
1361 }
1362 mutex_unlock(&capidev_list_lock);
1363 return 0;
1364}
1365
1366static void __init proc_init(void)
1367{
1368 proc_create_single("capi/capi20", 0, NULL, capi20_proc_show);
1369 proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show);
1370}
1371
1372static void __exit proc_exit(void)
1373{
1374 remove_proc_entry("capi/capi20", NULL);
1375 remove_proc_entry("capi/capi20ncci", NULL);
1376}
1377
1378/* -------- init function and module interface ---------------------- */
1379
1380
1381static int __init capi_init(void)
1382{
1383 const char *compileinfo;
1384 int major_ret;
1385 int ret;
1386
1387 ret = kcapi_init();
1388 if (ret)
1389 return ret;
1390
1391 major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1392 if (major_ret < 0) {
1393 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1394 kcapi_exit();
1395 return major_ret;
1396 }
1397
1398 ret = class_register(&capi_class);
1399 if (ret) {
1400 unregister_chrdev(capi_major, "capi20");
1401 kcapi_exit();
1402 return ret;
1403 }
1404
1405 device_create(&capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
1406
1407 if (capinc_tty_init() < 0) {
1408 device_destroy(&capi_class, MKDEV(capi_major, 0));
1409 class_unregister(&capi_class);
1410 unregister_chrdev(capi_major, "capi20");
1411 kcapi_exit();
1412 return -ENOMEM;
1413 }
1414
1415 proc_init();
1416
1417#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1418 compileinfo = " (middleware)";
1419#else
1420 compileinfo = " (no middleware)";
1421#endif
1422 printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1423 capi_major, compileinfo);
1424
1425 return 0;
1426}
1427
1428static void __exit capi_exit(void)
1429{
1430 proc_exit();
1431
1432 device_destroy(&capi_class, MKDEV(capi_major, 0));
1433 class_unregister(&capi_class);
1434 unregister_chrdev(capi_major, "capi20");
1435
1436 capinc_tty_exit();
1437
1438 kcapi_exit();
1439}
1440
1441module_init(capi_init);
1442module_exit(capi_exit);
Linux 6.x block layer and io_uring tree(s)