1 /*********************************************************************
2 *
3 * Filename: irlan_client_event.c
4 * Version: 0.9
5 * Description: IrLAN client state machine
6 * Status: Experimental.
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Sun Aug 31 20:14:37 1997
9 * Modified at: Sun Dec 26 21:52:24 1999
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
13 * All Rights Reserved.
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
19 *
20 * Neither Dag Brattli nor University of Tromsø admit liability nor
21 * provide warranty for any of this software. This material is
22 * provided "AS-IS" and at no charge.
23 *
24 ********************************************************************/
25
26 #include <linux/skbuff.h>
27
28 #include <net/irda/irda.h>
29 #include <net/irda/timer.h>
30 #include <net/irda/irmod.h>
31 #include <net/irda/iriap.h>
32 #include <net/irda/irlmp.h>
33 #include <net/irda/irttp.h>
34
35 #include <net/irda/irlan_common.h>
36 #include <net/irda/irlan_client.h>
37 #include <net/irda/irlan_event.h>
38
39 static int irlan_client_state_idle (struct irlan_cb *self, IRLAN_EVENT event,
40 struct sk_buff *skb);
41 static int irlan_client_state_query(struct irlan_cb *self, IRLAN_EVENT event,
42 struct sk_buff *skb);
43 static int irlan_client_state_conn (struct irlan_cb *self, IRLAN_EVENT event,
44 struct sk_buff *skb);
45 static int irlan_client_state_info (struct irlan_cb *self, IRLAN_EVENT event,
46 struct sk_buff *skb);
47 static int irlan_client_state_media(struct irlan_cb *self, IRLAN_EVENT event,
48 struct sk_buff *skb);
49 static int irlan_client_state_open (struct irlan_cb *self, IRLAN_EVENT event,
50 struct sk_buff *skb);
51 static int irlan_client_state_wait (struct irlan_cb *self, IRLAN_EVENT event,
52 struct sk_buff *skb);
53 static int irlan_client_state_arb (struct irlan_cb *self, IRLAN_EVENT event,
54 struct sk_buff *skb);
55 static int irlan_client_state_data (struct irlan_cb *self, IRLAN_EVENT event,
56 struct sk_buff *skb);
57 static int irlan_client_state_close(struct irlan_cb *self, IRLAN_EVENT event,
58 struct sk_buff *skb);
59 static int irlan_client_state_sync (struct irlan_cb *self, IRLAN_EVENT event,
60 struct sk_buff *skb);
61
62 static int (*state[])(struct irlan_cb *, IRLAN_EVENT event, struct sk_buff *) =
63 {
64 irlan_client_state_idle,
65 irlan_client_state_query,
66 irlan_client_state_conn,
67 irlan_client_state_info,
68 irlan_client_state_media,
69 irlan_client_state_open,
70 irlan_client_state_wait,
71 irlan_client_state_arb,
72 irlan_client_state_data,
73 irlan_client_state_close,
74 irlan_client_state_sync
75 };
76
irlan_do_client_event(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)77 void irlan_do_client_event(struct irlan_cb *self, IRLAN_EVENT event,
78 struct sk_buff *skb)
79 {
80 IRDA_ASSERT(self != NULL, return;);
81 IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
82
83 (*state[ self->client.state]) (self, event, skb);
84 }
85
86 /*
87 * Function irlan_client_state_idle (event, skb, info)
88 *
89 * IDLE, We are waiting for an indication that there is a provider
90 * available.
91 */
irlan_client_state_idle(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)92 static int irlan_client_state_idle(struct irlan_cb *self, IRLAN_EVENT event,
93 struct sk_buff *skb)
94 {
95 IRDA_DEBUG(4, "%s()\n", __func__ );
96
97 IRDA_ASSERT(self != NULL, return -1;);
98 IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
99
100 switch (event) {
101 case IRLAN_DISCOVERY_INDICATION:
102 if (self->client.iriap) {
103 IRDA_WARNING("%s(), busy with a previous query\n",
104 __func__);
105 return -EBUSY;
106 }
107
108 self->client.iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
109 irlan_client_get_value_confirm);
110 /* Get some values from peer IAS */
111 irlan_next_client_state(self, IRLAN_QUERY);
112 iriap_getvaluebyclass_request(self->client.iriap,
113 self->saddr, self->daddr,
114 "IrLAN", "IrDA:TinyTP:LsapSel");
115 break;
116 case IRLAN_WATCHDOG_TIMEOUT:
117 IRDA_DEBUG(2, "%s(), IRLAN_WATCHDOG_TIMEOUT\n", __func__ );
118 break;
119 default:
120 IRDA_DEBUG(4, "%s(), Unknown event %d\n", __func__ , event);
121 break;
122 }
123 if (skb)
124 dev_kfree_skb(skb);
125
126 return 0;
127 }
128
129 /*
130 * Function irlan_client_state_query (event, skb, info)
131 *
132 * QUERY, We have queryed the remote IAS and is ready to connect
133 * to provider, just waiting for the confirm.
134 *
135 */
irlan_client_state_query(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)136 static int irlan_client_state_query(struct irlan_cb *self, IRLAN_EVENT event,
137 struct sk_buff *skb)
138 {
139 IRDA_DEBUG(4, "%s()\n", __func__ );
140
141 IRDA_ASSERT(self != NULL, return -1;);
142 IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
143
144 switch(event) {
145 case IRLAN_IAS_PROVIDER_AVAIL:
146 IRDA_ASSERT(self->dtsap_sel_ctrl != 0, return -1;);
147
148 self->client.open_retries = 0;
149
150 irttp_connect_request(self->client.tsap_ctrl,
151 self->dtsap_sel_ctrl,
152 self->saddr, self->daddr, NULL,
153 IRLAN_MTU, NULL);
154 irlan_next_client_state(self, IRLAN_CONN);
155 break;
156 case IRLAN_IAS_PROVIDER_NOT_AVAIL:
157 IRDA_DEBUG(2, "%s(), IAS_PROVIDER_NOT_AVAIL\n", __func__ );
158 irlan_next_client_state(self, IRLAN_IDLE);
159
160 /* Give the client a kick! */
161 if ((self->provider.access_type == ACCESS_PEER) &&
162 (self->provider.state != IRLAN_IDLE))
163 irlan_client_wakeup(self, self->saddr, self->daddr);
164 break;
165 case IRLAN_LMP_DISCONNECT:
166 case IRLAN_LAP_DISCONNECT:
167 irlan_next_client_state(self, IRLAN_IDLE);
168 break;
169 case IRLAN_WATCHDOG_TIMEOUT:
170 IRDA_DEBUG(2, "%s(), IRLAN_WATCHDOG_TIMEOUT\n", __func__ );
171 break;
172 default:
173 IRDA_DEBUG(2, "%s(), Unknown event %d\n", __func__ , event);
174 break;
175 }
176 if (skb)
177 dev_kfree_skb(skb);
178
179 return 0;
180 }
181
182 /*
183 * Function irlan_client_state_conn (event, skb, info)
184 *
185 * CONN, We have connected to a provider but has not issued any
186 * commands yet.
187 *
188 */
irlan_client_state_conn(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)189 static int irlan_client_state_conn(struct irlan_cb *self, IRLAN_EVENT event,
190 struct sk_buff *skb)
191 {
192 IRDA_DEBUG(4, "%s()\n", __func__ );
193
194 IRDA_ASSERT(self != NULL, return -1;);
195
196 switch (event) {
197 case IRLAN_CONNECT_COMPLETE:
198 /* Send getinfo cmd */
199 irlan_get_provider_info(self);
200 irlan_next_client_state(self, IRLAN_INFO);
201 break;
202 case IRLAN_LMP_DISCONNECT:
203 case IRLAN_LAP_DISCONNECT:
204 irlan_next_client_state(self, IRLAN_IDLE);
205 break;
206 case IRLAN_WATCHDOG_TIMEOUT:
207 IRDA_DEBUG(2, "%s(), IRLAN_WATCHDOG_TIMEOUT\n", __func__ );
208 break;
209 default:
210 IRDA_DEBUG(2, "%s(), Unknown event %d\n", __func__ , event);
211 break;
212 }
213 if (skb)
214 dev_kfree_skb(skb);
215
216 return 0;
217 }
218
219 /*
220 * Function irlan_client_state_info (self, event, skb, info)
221 *
222 * INFO, We have issued a GetInfo command and is awaiting a reply.
223 */
irlan_client_state_info(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)224 static int irlan_client_state_info(struct irlan_cb *self, IRLAN_EVENT event,
225 struct sk_buff *skb)
226 {
227 IRDA_DEBUG(4, "%s()\n", __func__ );
228
229 IRDA_ASSERT(self != NULL, return -1;);
230
231 switch (event) {
232 case IRLAN_DATA_INDICATION:
233 IRDA_ASSERT(skb != NULL, return -1;);
234
235 irlan_client_parse_response(self, skb);
236
237 irlan_next_client_state(self, IRLAN_MEDIA);
238
239 irlan_get_media_char(self);
240 break;
241
242 case IRLAN_LMP_DISCONNECT:
243 case IRLAN_LAP_DISCONNECT:
244 irlan_next_client_state(self, IRLAN_IDLE);
245 break;
246 case IRLAN_WATCHDOG_TIMEOUT:
247 IRDA_DEBUG(2, "%s(), IRLAN_WATCHDOG_TIMEOUT\n", __func__ );
248 break;
249 default:
250 IRDA_DEBUG(2, "%s(), Unknown event %d\n", __func__ , event);
251 break;
252 }
253 if (skb)
254 dev_kfree_skb(skb);
255
256 return 0;
257 }
258
259 /*
260 * Function irlan_client_state_media (self, event, skb, info)
261 *
262 * MEDIA, The irlan_client has issued a GetMedia command and is awaiting a
263 * reply.
264 *
265 */
irlan_client_state_media(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)266 static int irlan_client_state_media(struct irlan_cb *self, IRLAN_EVENT event,
267 struct sk_buff *skb)
268 {
269 IRDA_DEBUG(4, "%s()\n", __func__ );
270
271 IRDA_ASSERT(self != NULL, return -1;);
272
273 switch(event) {
274 case IRLAN_DATA_INDICATION:
275 irlan_client_parse_response(self, skb);
276 irlan_open_data_channel(self);
277 irlan_next_client_state(self, IRLAN_OPEN);
278 break;
279 case IRLAN_LMP_DISCONNECT:
280 case IRLAN_LAP_DISCONNECT:
281 irlan_next_client_state(self, IRLAN_IDLE);
282 break;
283 case IRLAN_WATCHDOG_TIMEOUT:
284 IRDA_DEBUG(2, "%s(), IRLAN_WATCHDOG_TIMEOUT\n", __func__ );
285 break;
286 default:
287 IRDA_DEBUG(2, "%s(), Unknown event %d\n", __func__ , event);
288 break;
289 }
290 if (skb)
291 dev_kfree_skb(skb);
292
293 return 0;
294 }
295
296 /*
297 * Function irlan_client_state_open (self, event, skb, info)
298 *
299 * OPEN, The irlan_client has issued a OpenData command and is awaiting a
300 * reply
301 *
302 */
irlan_client_state_open(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)303 static int irlan_client_state_open(struct irlan_cb *self, IRLAN_EVENT event,
304 struct sk_buff *skb)
305 {
306 struct qos_info qos;
307
308 IRDA_DEBUG(4, "%s()\n", __func__ );
309
310 IRDA_ASSERT(self != NULL, return -1;);
311
312 switch(event) {
313 case IRLAN_DATA_INDICATION:
314 irlan_client_parse_response(self, skb);
315
316 /*
317 * Check if we have got the remote TSAP for data
318 * communications
319 */
320 IRDA_ASSERT(self->dtsap_sel_data != 0, return -1;);
321
322 /* Check which access type we are dealing with */
323 switch (self->client.access_type) {
324 case ACCESS_PEER:
325 if (self->provider.state == IRLAN_OPEN) {
326
327 irlan_next_client_state(self, IRLAN_ARB);
328 irlan_do_client_event(self, IRLAN_CHECK_CON_ARB,
329 NULL);
330 } else {
331
332 irlan_next_client_state(self, IRLAN_WAIT);
333 }
334 break;
335 case ACCESS_DIRECT:
336 case ACCESS_HOSTED:
337 qos.link_disc_time.bits = 0x01; /* 3 secs */
338
339 irttp_connect_request(self->tsap_data,
340 self->dtsap_sel_data,
341 self->saddr, self->daddr, &qos,
342 IRLAN_MTU, NULL);
343
344 irlan_next_client_state(self, IRLAN_DATA);
345 break;
346 default:
347 IRDA_DEBUG(2, "%s(), unknown access type!\n", __func__ );
348 break;
349 }
350 break;
351 case IRLAN_LMP_DISCONNECT:
352 case IRLAN_LAP_DISCONNECT:
353 irlan_next_client_state(self, IRLAN_IDLE);
354 break;
355 case IRLAN_WATCHDOG_TIMEOUT:
356 IRDA_DEBUG(2, "%s(), IRLAN_WATCHDOG_TIMEOUT\n", __func__ );
357 break;
358 default:
359 IRDA_DEBUG(2, "%s(), Unknown event %d\n", __func__ , event);
360 break;
361 }
362
363 if (skb)
364 dev_kfree_skb(skb);
365
366 return 0;
367 }
368
369 /*
370 * Function irlan_client_state_wait (self, event, skb, info)
371 *
372 * WAIT, The irlan_client is waiting for the local provider to enter the
373 * provider OPEN state.
374 *
375 */
irlan_client_state_wait(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)376 static int irlan_client_state_wait(struct irlan_cb *self, IRLAN_EVENT event,
377 struct sk_buff *skb)
378 {
379 IRDA_DEBUG(4, "%s()\n", __func__ );
380
381 IRDA_ASSERT(self != NULL, return -1;);
382
383 switch(event) {
384 case IRLAN_PROVIDER_SIGNAL:
385 irlan_next_client_state(self, IRLAN_ARB);
386 irlan_do_client_event(self, IRLAN_CHECK_CON_ARB, NULL);
387 break;
388 case IRLAN_LMP_DISCONNECT:
389 case IRLAN_LAP_DISCONNECT:
390 irlan_next_client_state(self, IRLAN_IDLE);
391 break;
392 case IRLAN_WATCHDOG_TIMEOUT:
393 IRDA_DEBUG(2, "%s(), IRLAN_WATCHDOG_TIMEOUT\n", __func__ );
394 break;
395 default:
396 IRDA_DEBUG(2, "%s(), Unknown event %d\n", __func__ , event);
397 break;
398 }
399 if (skb)
400 dev_kfree_skb(skb);
401
402 return 0;
403 }
404
irlan_client_state_arb(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)405 static int irlan_client_state_arb(struct irlan_cb *self, IRLAN_EVENT event,
406 struct sk_buff *skb)
407 {
408 struct qos_info qos;
409
410 IRDA_DEBUG(2, "%s()\n", __func__ );
411
412 IRDA_ASSERT(self != NULL, return -1;);
413
414 switch(event) {
415 case IRLAN_CHECK_CON_ARB:
416 if (self->client.recv_arb_val == self->provider.send_arb_val) {
417 irlan_next_client_state(self, IRLAN_CLOSE);
418 irlan_close_data_channel(self);
419 } else if (self->client.recv_arb_val <
420 self->provider.send_arb_val)
421 {
422 qos.link_disc_time.bits = 0x01; /* 3 secs */
423
424 irlan_next_client_state(self, IRLAN_DATA);
425 irttp_connect_request(self->tsap_data,
426 self->dtsap_sel_data,
427 self->saddr, self->daddr, &qos,
428 IRLAN_MTU, NULL);
429 } else if (self->client.recv_arb_val >
430 self->provider.send_arb_val)
431 {
432 IRDA_DEBUG(2, "%s(), lost the battle :-(\n", __func__ );
433 }
434 break;
435 case IRLAN_DATA_CONNECT_INDICATION:
436 irlan_next_client_state(self, IRLAN_DATA);
437 break;
438 case IRLAN_LMP_DISCONNECT:
439 case IRLAN_LAP_DISCONNECT:
440 irlan_next_client_state(self, IRLAN_IDLE);
441 break;
442 case IRLAN_WATCHDOG_TIMEOUT:
443 IRDA_DEBUG(2, "%s(), IRLAN_WATCHDOG_TIMEOUT\n", __func__ );
444 break;
445 default:
446 IRDA_DEBUG(2, "%s(), Unknown event %d\n", __func__ , event);
447 break;
448 }
449 if (skb)
450 dev_kfree_skb(skb);
451
452 return 0;
453 }
454
455 /*
456 * Function irlan_client_state_data (self, event, skb, info)
457 *
458 * DATA, The data channel is connected, allowing data transfers between
459 * the local and remote machines.
460 *
461 */
irlan_client_state_data(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)462 static int irlan_client_state_data(struct irlan_cb *self, IRLAN_EVENT event,
463 struct sk_buff *skb)
464 {
465 IRDA_DEBUG(4, "%s()\n", __func__ );
466
467 IRDA_ASSERT(self != NULL, return -1;);
468 IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
469
470 switch(event) {
471 case IRLAN_DATA_INDICATION:
472 irlan_client_parse_response(self, skb);
473 break;
474 case IRLAN_LMP_DISCONNECT: /* FALLTHROUGH */
475 case IRLAN_LAP_DISCONNECT:
476 irlan_next_client_state(self, IRLAN_IDLE);
477 break;
478 default:
479 IRDA_DEBUG(2, "%s(), Unknown event %d\n", __func__ , event);
480 break;
481 }
482 if (skb)
483 dev_kfree_skb(skb);
484
485 return 0;
486 }
487
488 /*
489 * Function irlan_client_state_close (self, event, skb, info)
490 *
491 *
492 *
493 */
irlan_client_state_close(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)494 static int irlan_client_state_close(struct irlan_cb *self, IRLAN_EVENT event,
495 struct sk_buff *skb)
496 {
497 IRDA_DEBUG(2, "%s()\n", __func__ );
498
499 if (skb)
500 dev_kfree_skb(skb);
501
502 return 0;
503 }
504
505 /*
506 * Function irlan_client_state_sync (self, event, skb, info)
507 *
508 *
509 *
510 */
irlan_client_state_sync(struct irlan_cb * self,IRLAN_EVENT event,struct sk_buff * skb)511 static int irlan_client_state_sync(struct irlan_cb *self, IRLAN_EVENT event,
512 struct sk_buff *skb)
513 {
514 IRDA_DEBUG(2, "%s()\n", __func__ );
515
516 if (skb)
517 dev_kfree_skb(skb);
518
519 return 0;
520 }
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