aboutsummaryrefslogtreecommitdiffstats
path: root/net/irda/ircomm/ircomm_core.c
blob: b825399fc16002dc98a3983c8475462286072afc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
/*********************************************************************
 *
 * Filename:      ircomm_core.c
 * Version:       1.0
 * Description:   IrCOMM service interface
 * Status:        Experimental.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun Jun  6 20:37:34 1999
 * Modified at:   Tue Dec 21 13:26:41 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 *
 *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
 *     Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
 *
 *     This program is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of
 *     the License, or (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program; if not, write to the Free Software
 *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *     MA 02111-1307 USA
 *
 ********************************************************************/

#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>

#include <net/irda/irda.h>
#include <net/irda/irmod.h>
#include <net/irda/irlmp.h>
#include <net/irda/iriap.h>
#include <net/irda/irttp.h>
#include <net/irda/irias_object.h>

#include <net/irda/ircomm_event.h>
#include <net/irda/ircomm_lmp.h>
#include <net/irda/ircomm_ttp.h>
#include <net/irda/ircomm_param.h>
#include <net/irda/ircomm_core.h>

static int __ircomm_close(struct ircomm_cb *self);
static void ircomm_control_indication(struct ircomm_cb *self,
				      struct sk_buff *skb, int clen);

#ifdef CONFIG_PROC_FS
extern struct proc_dir_entry *proc_irda;
static int ircomm_seq_open(struct inode *, struct file *);

static const struct file_operations ircomm_proc_fops = {
	.owner		= THIS_MODULE,
	.open           = ircomm_seq_open,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release	= seq_release,
};
#endif /* CONFIG_PROC_FS */

hashbin_t *ircomm = NULL;

static int __init ircomm_init(void)
{
	ircomm = hashbin_new(HB_LOCK);
	if (ircomm == NULL) {
		IRDA_ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__);
		return -ENOMEM;
	}

#ifdef CONFIG_PROC_FS
	{ struct proc_dir_entry *ent;
	ent = create_proc_entry("ircomm", 0, proc_irda);
	if (ent)
		ent->proc_fops = &ircomm_proc_fops;
	}
#endif /* CONFIG_PROC_FS */

	IRDA_MESSAGE("IrCOMM protocol (Dag Brattli)\n");

	return 0;
}

static void __exit ircomm_cleanup(void)
{
	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

	hashbin_delete(ircomm, (FREE_FUNC) __ircomm_close);

#ifdef CONFIG_PROC_FS
	remove_proc_entry("ircomm", proc_irda);
#endif /* CONFIG_PROC_FS */
}

/*
 * Function ircomm_open (client_notify)
 *
 *    Start a new IrCOMM instance
 *
 */
struct ircomm_cb *ircomm_open(notify_t *notify, __u8 service_type, int line)
{
	struct ircomm_cb *self = NULL;
	int ret;

	IRDA_DEBUG(2, "%s(), service_type=0x%02x\n", __FUNCTION__ ,
		   service_type);

	IRDA_ASSERT(ircomm != NULL, return NULL;);

	self = kzalloc(sizeof(struct ircomm_cb), GFP_ATOMIC);
	if (self == NULL)
		return NULL;

	self->notify = *notify;
	self->magic = IRCOMM_MAGIC;

	/* Check if we should use IrLMP or IrTTP */
	if (service_type & IRCOMM_3_WIRE_RAW) {
		self->flow_status = FLOW_START;
		ret = ircomm_open_lsap(self);
	} else
		ret = ircomm_open_tsap(self);

	if (ret < 0) {
		kfree(self);
		return NULL;
	}

	self->service_type = service_type;
	self->line = line;

	hashbin_insert(ircomm, (irda_queue_t *) self, line, NULL);

	ircomm_next_state(self, IRCOMM_IDLE);

	return self;
}

EXPORT_SYMBOL(ircomm_open);

/*
 * Function ircomm_close_instance (self)
 *
 *    Remove IrCOMM instance
 *
 */
static int __ircomm_close(struct ircomm_cb *self)
{
	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

	/* Disconnect link if any */
	ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, NULL, NULL);

	/* Remove TSAP */
	if (self->tsap) {
		irttp_close_tsap(self->tsap);
		self->tsap = NULL;
	}

	/* Remove LSAP */
	if (self->lsap) {
		irlmp_close_lsap(self->lsap);
		self->lsap = NULL;
	}
	self->magic = 0;

	kfree(self);

	return 0;
}

/*
 * Function ircomm_close (self)
 *
 *    Closes and removes the specified IrCOMM instance
 *
 */
int ircomm_close(struct ircomm_cb *self)
{
	struct ircomm_cb *entry;

	IRDA_ASSERT(self != NULL, return -EIO;);
	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EIO;);

	IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );

	entry = hashbin_remove(ircomm, self->line, NULL);

	IRDA_ASSERT(entry == self, return -1;);

	return __ircomm_close(self);
}

EXPORT_SYMBOL(ircomm_close);

/*
 * Function ircomm_connect_request (self, service_type)
 *
 *    Impl. of this function is differ from one of the reference. This
 *    function does discovery as well as sending connect request
 *
 */
int ircomm_connect_request(struct ircomm_cb *self, __u8 dlsap_sel,
			   __u32 saddr, __u32 daddr, struct sk_buff *skb,
			   __u8 service_type)
{
	struct ircomm_info info;
	int ret;

	IRDA_DEBUG(2 , "%s()\n", __FUNCTION__ );

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);

	self->service_type= service_type;

	info.dlsap_sel = dlsap_sel;
	info.saddr = saddr;
	info.daddr = daddr;

	ret = ircomm_do_event(self, IRCOMM_CONNECT_REQUEST, skb, &info);

	return ret;
}

EXPORT_SYMBOL(ircomm_connect_request);

/*
 * Function ircomm_connect_indication (self, qos, skb)
 *
 *    Notify user layer about the incoming connection
 *
 */
void ircomm_connect_indication(struct ircomm_cb *self, struct sk_buff *skb,
			       struct ircomm_info *info)
{
	int clen = 0;

	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

	/* Check if the packet contains data on the control channel */
	if (skb->len > 0)
		clen = skb->data[0];

	/*
	 * If there are any data hiding in the control channel, we must
	 * deliver it first. The side effect is that the control channel
	 * will be removed from the skb
	 */
	if (self->notify.connect_indication)
		self->notify.connect_indication(self->notify.instance, self,
						info->qos, info->max_data_size,
						info->max_header_size, skb);
	else {
		IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
	}
}

/*
 * Function ircomm_connect_response (self, userdata, max_sdu_size)
 *
 *    User accepts connection
 *
 */
int ircomm_connect_response(struct ircomm_cb *self, struct sk_buff *userdata)
{
	int ret;

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);

	IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

	ret = ircomm_do_event(self, IRCOMM_CONNECT_RESPONSE, userdata, NULL);

	return ret;
}

EXPORT_SYMBOL(ircomm_connect_response);

/*
 * Function connect_confirm (self, skb)
 *
 *    Notify user layer that the link is now connected
 *
 */
void ircomm_connect_confirm(struct ircomm_cb *self, struct sk_buff *skb,
			    struct ircomm_info *info)
{
	IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

	if (self->notify.connect_confirm )
		self->notify.connect_confirm(self->notify.instance,
					     self, info->qos,
					     info->max_data_size,
					     info->max_header_size, skb);
	else {
		IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
	}
}

/*
 * Function ircomm_data_request (self, userdata)
 *
 *    Send IrCOMM data to peer device
 *
 */
int ircomm_data_request(struct ircomm_cb *self, struct sk_buff *skb)
{
	int ret;

	IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

	IRDA_ASSERT(self != NULL, return -EFAULT;);
	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
	IRDA_ASSERT(skb != NULL, return -EFAULT;);

	ret = ircomm_do_event(self, IRCOMM_DATA_REQUEST, skb, NULL);

	return ret;
}

EXPORT_SYMBOL(ircomm_data_request);

/*
 * Function ircomm_data_indication (self, skb)
 *
 *    Data arrived, so deliver it to user
 *
 */
void ircomm_data_indication(struct ircomm_cb *self, struct sk_buff *skb)
{
	IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );

	IRDA_ASSERT(skb->len > 0, return;);

	if (self->notify.data_indication)
		self->notify.data_indication(self->notify.instance, self, skb);
	else {
		IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
	}
}

/*
 * Function ircomm_process_data (self, skb)
 *
 *    Data arrived which may contain control channel data
 *
 */
void ircomm_process_data(struct ircomm_cb *self, struct sk_buff *skb)
{
	int clen;

	IRDA_ASSERT(skb->len > 0, return;);

	clen = skb->data[0];

	/*
	 * Input validation check: a stir4200/mcp2150 combinations sometimes
	 * results in frames with clen > remaining packet size. These are
	 * illegal; if we throw away just this frame then it seems to carry on
	 * fine
	 */
	if (unlikely(skb->len < (clen + 1))) {
		IRDA_DEBUG(2, "%s() throwing away illegal frame\n",
			   __FUNCTION__ );
		return;
	}

	/*
	 * If there are any data hiding in the control channel, we must
	 * deliver it first. The side effect is that the control channel
	 * will be removed from the skb
	 */
	if (clen > 0)
		ircomm_control_indication(self, skb, clen);

	/* Remove control channel from data channel */
	skb_pull(skb, clen+1);

	if (skb->len)
		ircomm_data_indication(self, skb);
	else {
		IRDA_DEBUG(4, "%s(), data was control info only!\n",
			   __FUNCTION__ );
	}
}

/*
 * Function ircomm_control_request (self, params)
 *
 *    Send control data to peer device
 *
 */
int ircomm_control_request(struct ircomm_cb *self, struct sk_buff *skb)
{
	int ret;

	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

	IRDA_ASSERT(self != NULL, return -EFAULT;);
	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EFAULT;);
	IRDA_ASSERT(skb != NULL, return -EFAULT;);

	ret = ircomm_do_event(self, IRCOMM_CONTROL_REQUEST, skb, NULL);

	return ret;
}

EXPORT_SYMBOL(ircomm_control_request);

/*
 * Function ircomm_control_indication (self, skb)
 *
 *    Data has arrived on the control channel
 *
 */
static void ircomm_control_indication(struct ircomm_cb *self,
				      struct sk_buff *skb, int clen)
{
	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

	/* Use udata for delivering data on the control channel */
	if (self->notify.udata_indication) {
		struct sk_buff *ctrl_skb;

		/* We don't own the skb, so clone it */
		ctrl_skb = skb_clone(skb, GFP_ATOMIC);
		if (!ctrl_skb)
			return;

		/* Remove data channel from control channel */
		skb_trim(ctrl_skb, clen+1);

		self->notify.udata_indication(self->notify.instance, self,
					      ctrl_skb);

		/* Drop reference count -
		 * see ircomm_tty_control_indication(). */
		dev_kfree_skb(ctrl_skb);
	} else {
		IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
	}
}

/*
 * Function ircomm_disconnect_request (self, userdata, priority)
 *
 *    User layer wants to disconnect the IrCOMM connection
 *
 */
int ircomm_disconnect_request(struct ircomm_cb *self, struct sk_buff *userdata)
{
	struct ircomm_info info;
	int ret;

	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

	IRDA_ASSERT(self != NULL, return -1;);
	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -1;);

	ret = ircomm_do_event(self, IRCOMM_DISCONNECT_REQUEST, userdata,
			      &info);
	return ret;
}

EXPORT_SYMBOL(ircomm_disconnect_request);

/*
 * Function disconnect_indication (self, skb)
 *
 *    Tell user that the link has been disconnected
 *
 */
void ircomm_disconnect_indication(struct ircomm_cb *self, struct sk_buff *skb,
				  struct ircomm_info *info)
{
	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

	IRDA_ASSERT(info != NULL, return;);

	if (self->notify.disconnect_indication) {
		self->notify.disconnect_indication(self->notify.instance, self,
						   info->reason, skb);
	} else {
		IRDA_DEBUG(0, "%s(), missing handler\n", __FUNCTION__ );
	}
}

/*
 * Function ircomm_flow_request (self, flow)
 *
 *
 *
 */
void ircomm_flow_request(struct ircomm_cb *self, LOCAL_FLOW flow)
{
	IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );

	IRDA_ASSERT(self != NULL, return;);
	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return;);

	if (self->service_type == IRCOMM_3_WIRE_RAW)
		return;

	irttp_flow_request(self->tsap, flow);
}

EXPORT_SYMBOL(ircomm_flow_request);

#ifdef CONFIG_PROC_FS
static void *ircomm_seq_start(struct seq_file *seq, loff_t *pos)
{
	struct ircomm_cb *self;
	loff_t off = 0;

	spin_lock_irq(&ircomm->hb_spinlock);

	for (self = (struct ircomm_cb *) hashbin_get_first(ircomm);
	     self != NULL;
	     self = (struct ircomm_cb *) hashbin_get_next(ircomm)) {
		if (off++ == *pos)
			break;

	}
	return self;
}

static void *ircomm_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	++*pos;

	return (void *) hashbin_get_next(ircomm);
}

static void ircomm_seq_stop(struct seq_file *seq, void *v)
{
	spin_unlock_irq(&ircomm->hb_spinlock);
}

static int ircomm_seq_show(struct seq_file *seq, void *v)
{
	const struct ircomm_cb *self = v;

	IRDA_ASSERT(self->magic == IRCOMM_MAGIC, return -EINVAL; );

	if(self->line < 0x10)
		seq_printf(seq, "ircomm%d", self->line);
	else
		seq_printf(seq, "irlpt%d", self->line - 0x10);

	seq_printf(seq,
		   " state: %s, slsap_sel: %#02x, dlsap_sel: %#02x, mode:",
		   ircomm_state[ self->state],
		   self->slsap_sel, self->dlsap_sel);

	if(self->service_type & IRCOMM_3_WIRE_RAW)
		seq_printf(seq, " 3-wire-raw");
	if(self->service_type & IRCOMM_3_WIRE)
		seq_printf(seq, " 3-wire");
	if(self->service_type & IRCOMM_9_WIRE)
		seq_printf(seq, " 9-wire");
	if(self->service_type & IRCOMM_CENTRONICS)
		seq_printf(seq, " Centronics");
	seq_putc(seq, '\n');

	return 0;
}

static const struct seq_operations ircomm_seq_ops = {
	.start  = ircomm_seq_start,
	.next   = ircomm_seq_next,
	.stop   = ircomm_seq_stop,
	.show   = ircomm_seq_show,
};

static int ircomm_seq_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &ircomm_seq_ops);
}
#endif /* CONFIG_PROC_FS */

MODULE_AUTHOR("Dag Brattli <dag@brattli.net>");
MODULE_DESCRIPTION("IrCOMM protocol");
MODULE_LICENSE("GPL");

module_init(ircomm_init);
module_exit(ircomm_cleanup);