aboutsummaryrefslogtreecommitdiffstats
path: root/net/irda/ircomm/ircomm_lmp.c
blob: 08fb54dc8c412cbcb04721ca7df9f034ff06dcbf (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
/*********************************************************************
 *
 * Filename:      ircomm_lmp.c
 * Version:       1.0
 * Description:   Interface between IrCOMM and IrLMP
 * Status:        Stable
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun Jun  6 20:48:27 1999
 * Modified at:   Sun Dec 12 13:44:17 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 * Sources:       Previous IrLPT work by Thomas Davis
 *
 *     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/init.h>
#include <linux/gfp.h>

#include <net/irda/irda.h>
#include <net/irda/irlmp.h>
#include <net/irda/iriap.h>
#include <net/irda/irda_device.h>	/* struct irda_skb_cb */

#include <net/irda/ircomm_event.h>
#include <net/irda/ircomm_lmp.h>


/*
 * Function ircomm_lmp_connect_request (self, userdata)
 *
 *
 *
 */
static int ircomm_lmp_connect_request(struct ircomm_cb *self,
				      struct sk_buff *userdata,
				      struct ircomm_info *info)
{
	int ret = 0;

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

	/* Don't forget to refcount it - should be NULL anyway */
	if(userdata)
		skb_get(userdata);

	ret = irlmp_connect_request(self->lsap, info->dlsap_sel,
				    info->saddr, info->daddr, NULL, userdata);
	return ret;
}

/*
 * Function ircomm_lmp_connect_response (self, skb)
 *
 *
 *
 */
static int ircomm_lmp_connect_response(struct ircomm_cb *self,
				       struct sk_buff *userdata)
{
	struct sk_buff *tx_skb;
	int ret;

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

	/* Any userdata supplied? */
	if (userdata == NULL) {
		tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
		if (!tx_skb)
			return -ENOMEM;

		/* Reserve space for MUX and LAP header */
		skb_reserve(tx_skb, LMP_MAX_HEADER);
	} else {
		/*
		 *  Check that the client has reserved enough space for
		 *  headers
		 */
		IRDA_ASSERT(skb_headroom(userdata) >= LMP_MAX_HEADER,
			    return -1;);

		/* Don't forget to refcount it - should be NULL anyway */
		skb_get(userdata);
		tx_skb = userdata;
	}

	ret = irlmp_connect_response(self->lsap, tx_skb);

	return 0;
}

static int ircomm_lmp_disconnect_request(struct ircomm_cb *self,
					 struct sk_buff *userdata,
					 struct ircomm_info *info)
{
	struct sk_buff *tx_skb;
	int ret;

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

	if (!userdata) {
		tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
		if (!tx_skb)
			return -ENOMEM;

		/*  Reserve space for MUX and LAP header */
		skb_reserve(tx_skb, LMP_MAX_HEADER);
		userdata = tx_skb;
	} else {
		/* Don't forget to refcount it - should be NULL anyway */
		skb_get(userdata);
	}

	ret = irlmp_disconnect_request(self->lsap, userdata);

	return ret;
}

/*
 * Function ircomm_lmp_flow_control (skb)
 *
 *    This function is called when a data frame we have sent to IrLAP has
 *    been deallocated. We do this to make sure we don't flood IrLAP with
 *    frames, since we are not using the IrTTP flow control mechanism
 */
static void ircomm_lmp_flow_control(struct sk_buff *skb)
{
	struct irda_skb_cb *cb;
	struct ircomm_cb *self;
	int line;

	IRDA_ASSERT(skb != NULL, return;);

	cb = (struct irda_skb_cb *) skb->cb;

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

	line = cb->line;

	self = (struct ircomm_cb *) hashbin_lock_find(ircomm, line, NULL);
	if (!self) {
		IRDA_DEBUG(2, "%s(), didn't find myself\n", __func__ );
		return;
	}

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

	self->pkt_count--;

	if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
		IRDA_DEBUG(2, "%s(), asking TTY to start again!\n", __func__ );
		self->flow_status = FLOW_START;
		if (self->notify.flow_indication)
			self->notify.flow_indication(self->notify.instance,
						     self, FLOW_START);
	}
}

/*
 * Function ircomm_lmp_data_request (self, userdata)
 *
 *    Send data frame to peer device
 *
 */
static int ircomm_lmp_data_request(struct ircomm_cb *self,
				   struct sk_buff *skb,
				   int not_used)
{
	struct irda_skb_cb *cb;
	int ret;

	IRDA_ASSERT(skb != NULL, return -1;);

	cb = (struct irda_skb_cb *) skb->cb;

	cb->line = self->line;

	IRDA_DEBUG(4, "%s(), sending frame\n", __func__ );

	/* Don't forget to refcount it - see ircomm_tty_do_softint() */
	skb_get(skb);

	skb_orphan(skb);
	skb->destructor = ircomm_lmp_flow_control;

	if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
		IRDA_DEBUG(2, "%s(), asking TTY to slow down!\n", __func__ );
		self->flow_status = FLOW_STOP;
		if (self->notify.flow_indication)
			self->notify.flow_indication(self->notify.instance,
						     self, FLOW_STOP);
	}
	ret = irlmp_data_request(self->lsap, skb);
	if (ret) {
		IRDA_ERROR("%s(), failed\n", __func__);
		/* irlmp_data_request already free the packet */
	}

	return ret;
}

/*
 * Function ircomm_lmp_data_indication (instance, sap, skb)
 *
 *    Incoming data which we must deliver to the state machine, to check
 *    we are still connected.
 */
static int ircomm_lmp_data_indication(void *instance, void *sap,
				      struct sk_buff *skb)
{
	struct ircomm_cb *self = (struct ircomm_cb *) instance;

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

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

	ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL);

	/* Drop reference count - see ircomm_tty_data_indication(). */
	dev_kfree_skb(skb);

	return 0;
}

/*
 * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size,
 *                                       max_header_size, skb)
 *
 *    Connection has been confirmed by peer device
 *
 */
static void ircomm_lmp_connect_confirm(void *instance, void *sap,
				       struct qos_info *qos,
				       __u32 max_seg_size,
				       __u8 max_header_size,
				       struct sk_buff *skb)
{
	struct ircomm_cb *self = (struct ircomm_cb *) instance;
	struct ircomm_info info;

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

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

	info.max_data_size = max_seg_size;
	info.max_header_size = max_header_size;
	info.qos = qos;

	ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);

	/* Drop reference count - see ircomm_tty_connect_confirm(). */
	dev_kfree_skb(skb);
}

/*
 * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size,
 *                                         max_header_size, skb)
 *
 *    Peer device wants to make a connection with us
 *
 */
static void ircomm_lmp_connect_indication(void *instance, void *sap,
					  struct qos_info *qos,
					  __u32 max_seg_size,
					  __u8 max_header_size,
					  struct sk_buff *skb)
{
	struct ircomm_cb *self = (struct ircomm_cb *)instance;
	struct ircomm_info info;

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

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

	info.max_data_size = max_seg_size;
	info.max_header_size = max_header_size;
	info.qos = qos;

	ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);

	/* Drop reference count - see ircomm_tty_connect_indication(). */
	dev_kfree_skb(skb);
}

/*
 * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb)
 *
 *    Peer device has closed the connection, or the link went down for some
 *    other reason
 */
static void ircomm_lmp_disconnect_indication(void *instance, void *sap,
					     LM_REASON reason,
					     struct sk_buff *skb)
{
	struct ircomm_cb *self = (struct ircomm_cb *) instance;
	struct ircomm_info info;

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

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

	info.reason = reason;

	ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info);

	/* Drop reference count - see ircomm_tty_disconnect_indication(). */
	if(skb)
		dev_kfree_skb(skb);
}
/*
 * Function ircomm_open_lsap (self)
 *
 *    Open LSAP. This function will only be used when using "raw" services
 *
 */
int ircomm_open_lsap(struct ircomm_cb *self)
{
	notify_t notify;

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

	/* Register callbacks */
	irda_notify_init(&notify);
	notify.data_indication       = ircomm_lmp_data_indication;
	notify.connect_confirm       = ircomm_lmp_connect_confirm;
	notify.connect_indication    = ircomm_lmp_connect_indication;
	notify.disconnect_indication = ircomm_lmp_disconnect_indication;
	notify.instance = self;
	strlcpy(notify.name, "IrCOMM", sizeof(notify.name));

	self->lsap = irlmp_open_lsap(LSAP_ANY, &notify, 0);
	if (!self->lsap) {
		IRDA_DEBUG(0,"%sfailed to allocate tsap\n", __func__ );
		return -1;
	}
	self->slsap_sel = self->lsap->slsap_sel;

	/*
	 *  Initialize the call-table for issuing commands
	 */
	self->issue.data_request       = ircomm_lmp_data_request;
	self->issue.connect_request    = ircomm_lmp_connect_request;
	self->issue.connect_response   = ircomm_lmp_connect_response;
	self->issue.disconnect_request = ircomm_lmp_disconnect_request;

	return 0;
}