1 /*********************************************************************
2 *
3 * Filename: irlmp.c
4 * Version: 1.0
5 * Description: IrDA Link Management Protocol (LMP) layer
6 * Status: Stable.
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Sun Aug 17 20:54:32 1997
9 * Modified at: Wed Jan 5 11:26:03 2000
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 *
12 * Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>,
13 * All Rights Reserved.
14 * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation; either version 2 of
19 * the License, or (at your option) any later version.
20 *
21 * Neither Dag Brattli nor University of Tromsø admit liability nor
22 * provide warranty for any of this software. This material is
23 * provided "AS-IS" and at no charge.
24 *
25 ********************************************************************/
26
27 #include <linux/module.h>
28 #include <linux/slab.h>
29 #include <linux/string.h>
30 #include <linux/skbuff.h>
31 #include <linux/types.h>
32 #include <linux/proc_fs.h>
33 #include <linux/init.h>
34 #include <linux/kmod.h>
35 #include <linux/random.h>
36 #include <linux/seq_file.h>
37
38 #include <net/irda/irda.h>
39 #include <net/irda/timer.h>
40 #include <net/irda/qos.h>
41 #include <net/irda/irlap.h>
42 #include <net/irda/iriap.h>
43 #include <net/irda/irlmp.h>
44 #include <net/irda/irlmp_frame.h>
45
46 #include <asm/unaligned.h>
47
48 static __u8 irlmp_find_free_slsap(void);
49 static int irlmp_slsap_inuse(__u8 slsap_sel);
50
51 /* Master structure */
52 struct irlmp_cb *irlmp = NULL;
53
54 /* These can be altered by the sysctl interface */
55 int sysctl_discovery = 0;
56 int sysctl_discovery_timeout = 3; /* 3 seconds by default */
57 int sysctl_discovery_slots = 6; /* 6 slots by default */
58 int sysctl_lap_keepalive_time = LM_IDLE_TIMEOUT * 1000 / HZ;
59 char sysctl_devname[65];
60
61 static const char *irlmp_reasons[] = {
62 "ERROR, NOT USED",
63 "LM_USER_REQUEST",
64 "LM_LAP_DISCONNECT",
65 "LM_CONNECT_FAILURE",
66 "LM_LAP_RESET",
67 "LM_INIT_DISCONNECT",
68 "ERROR, NOT USED",
69 "UNKNOWN",
70 };
71
irlmp_reason_str(LM_REASON reason)72 const char *irlmp_reason_str(LM_REASON reason)
73 {
74 reason = min_t(size_t, reason, ARRAY_SIZE(irlmp_reasons) - 1);
75 return irlmp_reasons[reason];
76 }
77
78 /*
79 * Function irlmp_init (void)
80 *
81 * Create (allocate) the main IrLMP structure
82 *
83 */
irlmp_init(void)84 int __init irlmp_init(void)
85 {
86 /* Initialize the irlmp structure. */
87 irlmp = kzalloc( sizeof(struct irlmp_cb), GFP_KERNEL);
88 if (irlmp == NULL)
89 return -ENOMEM;
90
91 irlmp->magic = LMP_MAGIC;
92
93 irlmp->clients = hashbin_new(HB_LOCK);
94 irlmp->services = hashbin_new(HB_LOCK);
95 irlmp->links = hashbin_new(HB_LOCK);
96 irlmp->unconnected_lsaps = hashbin_new(HB_LOCK);
97 irlmp->cachelog = hashbin_new(HB_NOLOCK);
98
99 if ((irlmp->clients == NULL) ||
100 (irlmp->services == NULL) ||
101 (irlmp->links == NULL) ||
102 (irlmp->unconnected_lsaps == NULL) ||
103 (irlmp->cachelog == NULL)) {
104 return -ENOMEM;
105 }
106
107 spin_lock_init(&irlmp->cachelog->hb_spinlock);
108
109 irlmp->last_lsap_sel = 0x0f; /* Reserved 0x00-0x0f */
110 strcpy(sysctl_devname, "Linux");
111
112 init_timer(&irlmp->discovery_timer);
113
114 /* Do discovery every 3 seconds, conditionally */
115 if (sysctl_discovery)
116 irlmp_start_discovery_timer(irlmp,
117 sysctl_discovery_timeout*HZ);
118
119 return 0;
120 }
121
122 /*
123 * Function irlmp_cleanup (void)
124 *
125 * Remove IrLMP layer
126 *
127 */
irlmp_cleanup(void)128 void irlmp_cleanup(void)
129 {
130 /* Check for main structure */
131 IRDA_ASSERT(irlmp != NULL, return;);
132 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
133
134 del_timer(&irlmp->discovery_timer);
135
136 hashbin_delete(irlmp->links, (FREE_FUNC) kfree);
137 hashbin_delete(irlmp->unconnected_lsaps, (FREE_FUNC) kfree);
138 hashbin_delete(irlmp->clients, (FREE_FUNC) kfree);
139 hashbin_delete(irlmp->services, (FREE_FUNC) kfree);
140 hashbin_delete(irlmp->cachelog, (FREE_FUNC) kfree);
141
142 /* De-allocate main structure */
143 kfree(irlmp);
144 irlmp = NULL;
145 }
146
147 /*
148 * Function irlmp_open_lsap (slsap, notify)
149 *
150 * Register with IrLMP and create a local LSAP,
151 * returns handle to LSAP.
152 */
irlmp_open_lsap(__u8 slsap_sel,notify_t * notify,__u8 pid)153 struct lsap_cb *irlmp_open_lsap(__u8 slsap_sel, notify_t *notify, __u8 pid)
154 {
155 struct lsap_cb *self;
156
157 IRDA_ASSERT(notify != NULL, return NULL;);
158 IRDA_ASSERT(irlmp != NULL, return NULL;);
159 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return NULL;);
160 IRDA_ASSERT(notify->instance != NULL, return NULL;);
161
162 /* Does the client care which Source LSAP selector it gets? */
163 if (slsap_sel == LSAP_ANY) {
164 slsap_sel = irlmp_find_free_slsap();
165 if (!slsap_sel)
166 return NULL;
167 } else if (irlmp_slsap_inuse(slsap_sel))
168 return NULL;
169
170 /* Allocate new instance of a LSAP connection */
171 self = kzalloc(sizeof(struct lsap_cb), GFP_ATOMIC);
172 if (self == NULL)
173 return NULL;
174
175 self->magic = LMP_LSAP_MAGIC;
176 self->slsap_sel = slsap_sel;
177
178 /* Fix connectionless LSAP's */
179 if (slsap_sel == LSAP_CONNLESS) {
180 #ifdef CONFIG_IRDA_ULTRA
181 self->dlsap_sel = LSAP_CONNLESS;
182 self->pid = pid;
183 #endif /* CONFIG_IRDA_ULTRA */
184 } else
185 self->dlsap_sel = LSAP_ANY;
186 /* self->connected = FALSE; -> already NULL via memset() */
187
188 init_timer(&self->watchdog_timer);
189
190 self->notify = *notify;
191
192 self->lsap_state = LSAP_DISCONNECTED;
193
194 /* Insert into queue of unconnected LSAPs */
195 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
196 (long) self, NULL);
197
198 return self;
199 }
200 EXPORT_SYMBOL(irlmp_open_lsap);
201
202 /*
203 * Function __irlmp_close_lsap (self)
204 *
205 * Remove an instance of LSAP
206 */
__irlmp_close_lsap(struct lsap_cb * self)207 static void __irlmp_close_lsap(struct lsap_cb *self)
208 {
209 IRDA_ASSERT(self != NULL, return;);
210 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
211
212 /*
213 * Set some of the variables to preset values
214 */
215 self->magic = 0;
216 del_timer(&self->watchdog_timer); /* Important! */
217
218 if (self->conn_skb)
219 dev_kfree_skb(self->conn_skb);
220
221 kfree(self);
222 }
223
224 /*
225 * Function irlmp_close_lsap (self)
226 *
227 * Close and remove LSAP
228 *
229 */
irlmp_close_lsap(struct lsap_cb * self)230 void irlmp_close_lsap(struct lsap_cb *self)
231 {
232 struct lap_cb *lap;
233 struct lsap_cb *lsap = NULL;
234
235 IRDA_ASSERT(self != NULL, return;);
236 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
237
238 /*
239 * Find out if we should remove this LSAP from a link or from the
240 * list of unconnected lsaps (not associated with a link)
241 */
242 lap = self->lap;
243 if (lap) {
244 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
245 /* We might close a LSAP before it has completed the
246 * connection setup. In those case, higher layers won't
247 * send a proper disconnect request. Harmless, except
248 * that we will forget to close LAP... - Jean II */
249 if(self->lsap_state != LSAP_DISCONNECTED) {
250 self->lsap_state = LSAP_DISCONNECTED;
251 irlmp_do_lap_event(self->lap,
252 LM_LAP_DISCONNECT_REQUEST, NULL);
253 }
254 /* Now, remove from the link */
255 lsap = hashbin_remove(lap->lsaps, (long) self, NULL);
256 #ifdef CONFIG_IRDA_CACHE_LAST_LSAP
257 lap->cache.valid = FALSE;
258 #endif
259 }
260 self->lap = NULL;
261 /* Check if we found the LSAP! If not then try the unconnected lsaps */
262 if (!lsap) {
263 lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self,
264 NULL);
265 }
266 if (!lsap) {
267 pr_debug("%s(), Looks like somebody has removed me already!\n",
268 __func__);
269 return;
270 }
271 __irlmp_close_lsap(self);
272 }
273 EXPORT_SYMBOL(irlmp_close_lsap);
274
275 /*
276 * Function irlmp_register_irlap (saddr, notify)
277 *
278 * Register IrLAP layer with IrLMP. There is possible to have multiple
279 * instances of the IrLAP layer, each connected to different IrDA ports
280 *
281 */
irlmp_register_link(struct irlap_cb * irlap,__u32 saddr,notify_t * notify)282 void irlmp_register_link(struct irlap_cb *irlap, __u32 saddr, notify_t *notify)
283 {
284 struct lap_cb *lap;
285
286 IRDA_ASSERT(irlmp != NULL, return;);
287 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
288 IRDA_ASSERT(notify != NULL, return;);
289
290 /*
291 * Allocate new instance of a LSAP connection
292 */
293 lap = kzalloc(sizeof(struct lap_cb), GFP_KERNEL);
294 if (lap == NULL)
295 return;
296
297 lap->irlap = irlap;
298 lap->magic = LMP_LAP_MAGIC;
299 lap->saddr = saddr;
300 lap->daddr = DEV_ADDR_ANY;
301 #ifdef CONFIG_IRDA_CACHE_LAST_LSAP
302 lap->cache.valid = FALSE;
303 #endif
304 lap->lsaps = hashbin_new(HB_LOCK);
305 if (lap->lsaps == NULL) {
306 net_warn_ratelimited("%s(), unable to kmalloc lsaps\n",
307 __func__);
308 kfree(lap);
309 return;
310 }
311
312 lap->lap_state = LAP_STANDBY;
313
314 init_timer(&lap->idle_timer);
315
316 /*
317 * Insert into queue of LMP links
318 */
319 hashbin_insert(irlmp->links, (irda_queue_t *) lap, lap->saddr, NULL);
320
321 /*
322 * We set only this variable so IrLAP can tell us on which link the
323 * different events happened on
324 */
325 irda_notify_init(notify);
326 notify->instance = lap;
327 }
328
329 /*
330 * Function irlmp_unregister_irlap (saddr)
331 *
332 * IrLAP layer has been removed!
333 *
334 */
irlmp_unregister_link(__u32 saddr)335 void irlmp_unregister_link(__u32 saddr)
336 {
337 struct lap_cb *link;
338
339 /* We must remove ourselves from the hashbin *first*. This ensure
340 * that no more LSAPs will be open on this link and no discovery
341 * will be triggered anymore. Jean II */
342 link = hashbin_remove(irlmp->links, saddr, NULL);
343 if (link) {
344 IRDA_ASSERT(link->magic == LMP_LAP_MAGIC, return;);
345
346 /* Kill all the LSAPs on this link. Jean II */
347 link->reason = LAP_DISC_INDICATION;
348 link->daddr = DEV_ADDR_ANY;
349 irlmp_do_lap_event(link, LM_LAP_DISCONNECT_INDICATION, NULL);
350
351 /* Remove all discoveries discovered at this link */
352 irlmp_expire_discoveries(irlmp->cachelog, link->saddr, TRUE);
353
354 /* Final cleanup */
355 del_timer(&link->idle_timer);
356 link->magic = 0;
357 hashbin_delete(link->lsaps, (FREE_FUNC) __irlmp_close_lsap);
358 kfree(link);
359 }
360 }
361
362 /*
363 * Function irlmp_connect_request (handle, dlsap, userdata)
364 *
365 * Connect with a peer LSAP
366 *
367 */
irlmp_connect_request(struct lsap_cb * self,__u8 dlsap_sel,__u32 saddr,__u32 daddr,struct qos_info * qos,struct sk_buff * userdata)368 int irlmp_connect_request(struct lsap_cb *self, __u8 dlsap_sel,
369 __u32 saddr, __u32 daddr,
370 struct qos_info *qos, struct sk_buff *userdata)
371 {
372 struct sk_buff *tx_skb = userdata;
373 struct lap_cb *lap;
374 struct lsap_cb *lsap;
375 int ret;
376
377 IRDA_ASSERT(self != NULL, return -EBADR;);
378 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -EBADR;);
379
380 pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x, saddr=%08x, daddr=%08x\n",
381 __func__, self->slsap_sel, dlsap_sel, saddr, daddr);
382
383 if (test_bit(0, &self->connected)) {
384 ret = -EISCONN;
385 goto err;
386 }
387
388 /* Client must supply destination device address */
389 if (!daddr) {
390 ret = -EINVAL;
391 goto err;
392 }
393
394 /* Any userdata? */
395 if (tx_skb == NULL) {
396 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
397 if (!tx_skb)
398 return -ENOMEM;
399
400 skb_reserve(tx_skb, LMP_MAX_HEADER);
401 }
402
403 /* Make room for MUX control header (3 bytes) */
404 IRDA_ASSERT(skb_headroom(tx_skb) >= LMP_CONTROL_HEADER, return -1;);
405 skb_push(tx_skb, LMP_CONTROL_HEADER);
406
407 self->dlsap_sel = dlsap_sel;
408
409 /*
410 * Find the link to where we should try to connect since there may
411 * be more than one IrDA port on this machine. If the client has
412 * passed us the saddr (and already knows which link to use), then
413 * we use that to find the link, if not then we have to look in the
414 * discovery log and check if any of the links has discovered a
415 * device with the given daddr
416 */
417 if ((!saddr) || (saddr == DEV_ADDR_ANY)) {
418 discovery_t *discovery;
419 unsigned long flags;
420
421 spin_lock_irqsave(&irlmp->cachelog->hb_spinlock, flags);
422 if (daddr != DEV_ADDR_ANY)
423 discovery = hashbin_find(irlmp->cachelog, daddr, NULL);
424 else {
425 pr_debug("%s(), no daddr\n", __func__);
426 discovery = (discovery_t *)
427 hashbin_get_first(irlmp->cachelog);
428 }
429
430 if (discovery) {
431 saddr = discovery->data.saddr;
432 daddr = discovery->data.daddr;
433 }
434 spin_unlock_irqrestore(&irlmp->cachelog->hb_spinlock, flags);
435 }
436 lap = hashbin_lock_find(irlmp->links, saddr, NULL);
437 if (lap == NULL) {
438 pr_debug("%s(), Unable to find a usable link!\n", __func__);
439 ret = -EHOSTUNREACH;
440 goto err;
441 }
442
443 /* Check if LAP is disconnected or already connected */
444 if (lap->daddr == DEV_ADDR_ANY)
445 lap->daddr = daddr;
446 else if (lap->daddr != daddr) {
447 /* Check if some LSAPs are active on this LAP */
448 if (HASHBIN_GET_SIZE(lap->lsaps) == 0) {
449 /* No active connection, but LAP hasn't been
450 * disconnected yet (waiting for timeout in LAP).
451 * Maybe we could give LAP a bit of help in this case.
452 */
453 pr_debug("%s(), sorry, but I'm waiting for LAP to timeout!\n",
454 __func__);
455 ret = -EAGAIN;
456 goto err;
457 }
458
459 /* LAP is already connected to a different node, and LAP
460 * can only talk to one node at a time */
461 pr_debug("%s(), sorry, but link is busy!\n", __func__);
462 ret = -EBUSY;
463 goto err;
464 }
465
466 self->lap = lap;
467
468 /*
469 * Remove LSAP from list of unconnected LSAPs and insert it into the
470 * list of connected LSAPs for the particular link
471 */
472 lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self, NULL);
473
474 IRDA_ASSERT(lsap != NULL, return -1;);
475 IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
476 IRDA_ASSERT(lsap->lap != NULL, return -1;);
477 IRDA_ASSERT(lsap->lap->magic == LMP_LAP_MAGIC, return -1;);
478
479 hashbin_insert(self->lap->lsaps, (irda_queue_t *) self, (long) self,
480 NULL);
481
482 set_bit(0, &self->connected); /* TRUE */
483
484 /*
485 * User supplied qos specifications?
486 */
487 if (qos)
488 self->qos = *qos;
489
490 irlmp_do_lsap_event(self, LM_CONNECT_REQUEST, tx_skb);
491
492 /* Drop reference count - see irlap_data_request(). */
493 dev_kfree_skb(tx_skb);
494
495 return 0;
496
497 err:
498 /* Cleanup */
499 if(tx_skb)
500 dev_kfree_skb(tx_skb);
501 return ret;
502 }
503 EXPORT_SYMBOL(irlmp_connect_request);
504
505 /*
506 * Function irlmp_connect_indication (self)
507 *
508 * Incoming connection
509 *
510 */
irlmp_connect_indication(struct lsap_cb * self,struct sk_buff * skb)511 void irlmp_connect_indication(struct lsap_cb *self, struct sk_buff *skb)
512 {
513 int max_seg_size;
514 int lap_header_size;
515 int max_header_size;
516
517 IRDA_ASSERT(self != NULL, return;);
518 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
519 IRDA_ASSERT(skb != NULL, return;);
520 IRDA_ASSERT(self->lap != NULL, return;);
521
522 pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
523 __func__, self->slsap_sel, self->dlsap_sel);
524
525 /* Note : self->lap is set in irlmp_link_data_indication(),
526 * (case CONNECT_CMD:) because we have no way to set it here.
527 * Similarly, self->dlsap_sel is usually set in irlmp_find_lsap().
528 * Jean II */
529
530 self->qos = *self->lap->qos;
531
532 max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
533 lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
534 max_header_size = LMP_HEADER + lap_header_size;
535
536 /* Hide LMP_CONTROL_HEADER header from layer above */
537 skb_pull(skb, LMP_CONTROL_HEADER);
538
539 if (self->notify.connect_indication) {
540 /* Don't forget to refcount it - see irlap_driver_rcv(). */
541 skb_get(skb);
542 self->notify.connect_indication(self->notify.instance, self,
543 &self->qos, max_seg_size,
544 max_header_size, skb);
545 }
546 }
547
548 /*
549 * Function irlmp_connect_response (handle, userdata)
550 *
551 * Service user is accepting connection
552 *
553 */
irlmp_connect_response(struct lsap_cb * self,struct sk_buff * userdata)554 int irlmp_connect_response(struct lsap_cb *self, struct sk_buff *userdata)
555 {
556 IRDA_ASSERT(self != NULL, return -1;);
557 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
558 IRDA_ASSERT(userdata != NULL, return -1;);
559
560 /* We set the connected bit and move the lsap to the connected list
561 * in the state machine itself. Jean II */
562
563 pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
564 __func__, self->slsap_sel, self->dlsap_sel);
565
566 /* Make room for MUX control header (3 bytes) */
567 IRDA_ASSERT(skb_headroom(userdata) >= LMP_CONTROL_HEADER, return -1;);
568 skb_push(userdata, LMP_CONTROL_HEADER);
569
570 irlmp_do_lsap_event(self, LM_CONNECT_RESPONSE, userdata);
571
572 /* Drop reference count - see irlap_data_request(). */
573 dev_kfree_skb(userdata);
574
575 return 0;
576 }
577 EXPORT_SYMBOL(irlmp_connect_response);
578
579 /*
580 * Function irlmp_connect_confirm (handle, skb)
581 *
582 * LSAP connection confirmed peer device!
583 */
irlmp_connect_confirm(struct lsap_cb * self,struct sk_buff * skb)584 void irlmp_connect_confirm(struct lsap_cb *self, struct sk_buff *skb)
585 {
586 int max_header_size;
587 int lap_header_size;
588 int max_seg_size;
589
590 IRDA_ASSERT(skb != NULL, return;);
591 IRDA_ASSERT(self != NULL, return;);
592 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
593 IRDA_ASSERT(self->lap != NULL, return;);
594
595 self->qos = *self->lap->qos;
596
597 max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
598 lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
599 max_header_size = LMP_HEADER + lap_header_size;
600
601 pr_debug("%s(), max_header_size=%d\n",
602 __func__, max_header_size);
603
604 /* Hide LMP_CONTROL_HEADER header from layer above */
605 skb_pull(skb, LMP_CONTROL_HEADER);
606
607 if (self->notify.connect_confirm) {
608 /* Don't forget to refcount it - see irlap_driver_rcv() */
609 skb_get(skb);
610 self->notify.connect_confirm(self->notify.instance, self,
611 &self->qos, max_seg_size,
612 max_header_size, skb);
613 }
614 }
615
616 /*
617 * Function irlmp_dup (orig, instance)
618 *
619 * Duplicate LSAP, can be used by servers to confirm a connection on a
620 * new LSAP so it can keep listening on the old one.
621 *
622 */
irlmp_dup(struct lsap_cb * orig,void * instance)623 struct lsap_cb *irlmp_dup(struct lsap_cb *orig, void *instance)
624 {
625 struct lsap_cb *new;
626 unsigned long flags;
627
628 spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);
629
630 /* Only allowed to duplicate unconnected LSAP's, and only LSAPs
631 * that have received a connect indication. Jean II */
632 if ((!hashbin_find(irlmp->unconnected_lsaps, (long) orig, NULL)) ||
633 (orig->lap == NULL)) {
634 pr_debug("%s(), invalid LSAP (wrong state)\n",
635 __func__);
636 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
637 flags);
638 return NULL;
639 }
640
641 /* Allocate a new instance */
642 new = kmemdup(orig, sizeof(*new), GFP_ATOMIC);
643 if (!new) {
644 pr_debug("%s(), unable to kmalloc\n", __func__);
645 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
646 flags);
647 return NULL;
648 }
649 /* new->lap = orig->lap; => done in the memcpy() */
650 /* new->slsap_sel = orig->slsap_sel; => done in the memcpy() */
651 new->conn_skb = NULL;
652
653 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
654
655 /* Not everything is the same */
656 new->notify.instance = instance;
657
658 init_timer(&new->watchdog_timer);
659
660 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) new,
661 (long) new, NULL);
662
663 #ifdef CONFIG_IRDA_CACHE_LAST_LSAP
664 /* Make sure that we invalidate the LSAP cache */
665 new->lap->cache.valid = FALSE;
666 #endif /* CONFIG_IRDA_CACHE_LAST_LSAP */
667
668 return new;
669 }
670
671 /*
672 * Function irlmp_disconnect_request (handle, userdata)
673 *
674 * The service user is requesting disconnection, this will not remove the
675 * LSAP, but only mark it as disconnected
676 */
irlmp_disconnect_request(struct lsap_cb * self,struct sk_buff * userdata)677 int irlmp_disconnect_request(struct lsap_cb *self, struct sk_buff *userdata)
678 {
679 struct lsap_cb *lsap;
680
681 IRDA_ASSERT(self != NULL, return -1;);
682 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
683 IRDA_ASSERT(userdata != NULL, return -1;);
684
685 /* Already disconnected ?
686 * There is a race condition between irlmp_disconnect_indication()
687 * and us that might mess up the hashbins below. This fixes it.
688 * Jean II */
689 if (! test_and_clear_bit(0, &self->connected)) {
690 pr_debug("%s(), already disconnected!\n", __func__);
691 dev_kfree_skb(userdata);
692 return -1;
693 }
694
695 skb_push(userdata, LMP_CONTROL_HEADER);
696
697 /*
698 * Do the event before the other stuff since we must know
699 * which lap layer that the frame should be transmitted on
700 */
701 irlmp_do_lsap_event(self, LM_DISCONNECT_REQUEST, userdata);
702
703 /* Drop reference count - see irlap_data_request(). */
704 dev_kfree_skb(userdata);
705
706 /*
707 * Remove LSAP from list of connected LSAPs for the particular link
708 * and insert it into the list of unconnected LSAPs
709 */
710 IRDA_ASSERT(self->lap != NULL, return -1;);
711 IRDA_ASSERT(self->lap->magic == LMP_LAP_MAGIC, return -1;);
712 IRDA_ASSERT(self->lap->lsaps != NULL, return -1;);
713
714 lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
715 #ifdef CONFIG_IRDA_CACHE_LAST_LSAP
716 self->lap->cache.valid = FALSE;
717 #endif
718
719 IRDA_ASSERT(lsap != NULL, return -1;);
720 IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
721 IRDA_ASSERT(lsap == self, return -1;);
722
723 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
724 (long) self, NULL);
725
726 /* Reset some values */
727 self->dlsap_sel = LSAP_ANY;
728 self->lap = NULL;
729
730 return 0;
731 }
732 EXPORT_SYMBOL(irlmp_disconnect_request);
733
734 /*
735 * Function irlmp_disconnect_indication (reason, userdata)
736 *
737 * LSAP is being closed!
738 */
irlmp_disconnect_indication(struct lsap_cb * self,LM_REASON reason,struct sk_buff * skb)739 void irlmp_disconnect_indication(struct lsap_cb *self, LM_REASON reason,
740 struct sk_buff *skb)
741 {
742 struct lsap_cb *lsap;
743
744 pr_debug("%s(), reason=%s [%d]\n", __func__,
745 irlmp_reason_str(reason), reason);
746 IRDA_ASSERT(self != NULL, return;);
747 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
748
749 pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
750 __func__, self->slsap_sel, self->dlsap_sel);
751
752 /* Already disconnected ?
753 * There is a race condition between irlmp_disconnect_request()
754 * and us that might mess up the hashbins below. This fixes it.
755 * Jean II */
756 if (! test_and_clear_bit(0, &self->connected)) {
757 pr_debug("%s(), already disconnected!\n", __func__);
758 return;
759 }
760
761 /*
762 * Remove association between this LSAP and the link it used
763 */
764 IRDA_ASSERT(self->lap != NULL, return;);
765 IRDA_ASSERT(self->lap->lsaps != NULL, return;);
766
767 lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
768 #ifdef CONFIG_IRDA_CACHE_LAST_LSAP
769 self->lap->cache.valid = FALSE;
770 #endif
771
772 IRDA_ASSERT(lsap != NULL, return;);
773 IRDA_ASSERT(lsap == self, return;);
774 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) lsap,
775 (long) lsap, NULL);
776
777 self->dlsap_sel = LSAP_ANY;
778 self->lap = NULL;
779
780 /*
781 * Inform service user
782 */
783 if (self->notify.disconnect_indication) {
784 /* Don't forget to refcount it - see irlap_driver_rcv(). */
785 if(skb)
786 skb_get(skb);
787 self->notify.disconnect_indication(self->notify.instance,
788 self, reason, skb);
789 } else {
790 pr_debug("%s(), no handler\n", __func__);
791 }
792 }
793
794 /*
795 * Function irlmp_do_expiry (void)
796 *
797 * Do a cleanup of the discovery log (remove old entries)
798 *
799 * Note : separate from irlmp_do_discovery() so that we can handle
800 * passive discovery properly.
801 */
irlmp_do_expiry(void)802 void irlmp_do_expiry(void)
803 {
804 struct lap_cb *lap;
805
806 /*
807 * Expire discovery on all links which are *not* connected.
808 * On links which are connected, we can't do discovery
809 * anymore and can't refresh the log, so we freeze the
810 * discovery log to keep info about the device we are
811 * connected to.
812 * This info is mandatory if we want irlmp_connect_request()
813 * to work properly. - Jean II
814 */
815 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
816 while (lap != NULL) {
817 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
818
819 if (lap->lap_state == LAP_STANDBY) {
820 /* Expire discoveries discovered on this link */
821 irlmp_expire_discoveries(irlmp->cachelog, lap->saddr,
822 FALSE);
823 }
824 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
825 }
826 }
827
828 /*
829 * Function irlmp_do_discovery (nslots)
830 *
831 * Do some discovery on all links
832 *
833 * Note : log expiry is done above.
834 */
irlmp_do_discovery(int nslots)835 void irlmp_do_discovery(int nslots)
836 {
837 struct lap_cb *lap;
838 __u16 *data_hintsp;
839
840 /* Make sure the value is sane */
841 if ((nslots != 1) && (nslots != 6) && (nslots != 8) && (nslots != 16)){
842 net_warn_ratelimited("%s: invalid value for number of slots!\n",
843 __func__);
844 nslots = sysctl_discovery_slots = 8;
845 }
846
847 /* Construct new discovery info to be used by IrLAP, */
848 data_hintsp = (__u16 *) irlmp->discovery_cmd.data.hints;
849 put_unaligned(irlmp->hints.word, data_hintsp);
850
851 /*
852 * Set character set for device name (we use ASCII), and
853 * copy device name. Remember to make room for a \0 at the
854 * end
855 */
856 irlmp->discovery_cmd.data.charset = CS_ASCII;
857 strncpy(irlmp->discovery_cmd.data.info, sysctl_devname,
858 NICKNAME_MAX_LEN);
859 irlmp->discovery_cmd.name_len = strlen(irlmp->discovery_cmd.data.info);
860 irlmp->discovery_cmd.nslots = nslots;
861
862 /*
863 * Try to send discovery packets on all links
864 */
865 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
866 while (lap != NULL) {
867 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
868
869 if (lap->lap_state == LAP_STANDBY) {
870 /* Try to discover */
871 irlmp_do_lap_event(lap, LM_LAP_DISCOVERY_REQUEST,
872 NULL);
873 }
874 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
875 }
876 }
877
878 /*
879 * Function irlmp_discovery_request (nslots)
880 *
881 * Do a discovery of devices in front of the computer
882 *
883 * If the caller has registered a client discovery callback, this
884 * allow him to receive the full content of the discovery log through
885 * this callback (as normally he will receive only new discoveries).
886 */
irlmp_discovery_request(int nslots)887 void irlmp_discovery_request(int nslots)
888 {
889 /* Return current cached discovery log (in full) */
890 irlmp_discovery_confirm(irlmp->cachelog, DISCOVERY_LOG);
891
892 /*
893 * Start a single discovery operation if discovery is not already
894 * running
895 */
896 if (!sysctl_discovery) {
897 /* Check if user wants to override the default */
898 if (nslots == DISCOVERY_DEFAULT_SLOTS)
899 nslots = sysctl_discovery_slots;
900
901 irlmp_do_discovery(nslots);
902 /* Note : we never do expiry here. Expiry will run on the
903 * discovery timer regardless of the state of sysctl_discovery
904 * Jean II */
905 }
906 }
907 EXPORT_SYMBOL(irlmp_discovery_request);
908
909 /*
910 * Function irlmp_get_discoveries (pn, mask, slots)
911 *
912 * Return the current discovery log
913 *
914 * If discovery is not enabled, you should call this function again
915 * after 1 or 2 seconds (i.e. after discovery has been done).
916 */
irlmp_get_discoveries(int * pn,__u16 mask,int nslots)917 struct irda_device_info *irlmp_get_discoveries(int *pn, __u16 mask, int nslots)
918 {
919 /* If discovery is not enabled, it's likely that the discovery log
920 * will be empty. So, we trigger a single discovery, so that next
921 * time the user call us there might be some results in the log.
922 * Jean II
923 */
924 if (!sysctl_discovery) {
925 /* Check if user wants to override the default */
926 if (nslots == DISCOVERY_DEFAULT_SLOTS)
927 nslots = sysctl_discovery_slots;
928
929 /* Start discovery - will complete sometime later */
930 irlmp_do_discovery(nslots);
931 /* Note : we never do expiry here. Expiry will run on the
932 * discovery timer regardless of the state of sysctl_discovery
933 * Jean II */
934 }
935
936 /* Return current cached discovery log */
937 return irlmp_copy_discoveries(irlmp->cachelog, pn, mask, TRUE);
938 }
939 EXPORT_SYMBOL(irlmp_get_discoveries);
940
941 /*
942 * Function irlmp_notify_client (log)
943 *
944 * Notify all about discovered devices
945 *
946 * Clients registered with IrLMP are :
947 * o IrComm
948 * o IrLAN
949 * o Any socket (in any state - ouch, that may be a lot !)
950 * The client may have defined a callback to be notified in case of
951 * partial/selective discovery based on the hints that it passed to IrLMP.
952 */
953 static inline void
irlmp_notify_client(irlmp_client_t * client,hashbin_t * log,DISCOVERY_MODE mode)954 irlmp_notify_client(irlmp_client_t *client,
955 hashbin_t *log, DISCOVERY_MODE mode)
956 {
957 discinfo_t *discoveries; /* Copy of the discovery log */
958 int number; /* Number of nodes in the log */
959 int i;
960
961 /* Check if client wants or not partial/selective log (optimisation) */
962 if (!client->disco_callback)
963 return;
964
965 /*
966 * Locking notes :
967 * the old code was manipulating the log directly, which was
968 * very racy. Now, we use copy_discoveries, that protects
969 * itself while dumping the log for us.
970 * The overhead of the copy is compensated by the fact that
971 * we only pass new discoveries in normal mode and don't
972 * pass the same old entry every 3s to the caller as we used
973 * to do (virtual function calling is expensive).
974 * Jean II
975 */
976
977 /*
978 * Now, check all discovered devices (if any), and notify client
979 * only about the services that the client is interested in
980 * We also notify only about the new devices unless the caller
981 * explicitly request a dump of the log. Jean II
982 */
983 discoveries = irlmp_copy_discoveries(log, &number,
984 client->hint_mask.word,
985 (mode == DISCOVERY_LOG));
986 /* Check if the we got some results */
987 if (discoveries == NULL)
988 return; /* No nodes discovered */
989
990 /* Pass all entries to the listener */
991 for(i = 0; i < number; i++)
992 client->disco_callback(&(discoveries[i]), mode, client->priv);
993
994 /* Free up our buffer */
995 kfree(discoveries);
996 }
997
998 /*
999 * Function irlmp_discovery_confirm ( self, log)
1000 *
1001 * Some device(s) answered to our discovery request! Check to see which
1002 * device it is, and give indication to the client(s)
1003 *
1004 */
irlmp_discovery_confirm(hashbin_t * log,DISCOVERY_MODE mode)1005 void irlmp_discovery_confirm(hashbin_t *log, DISCOVERY_MODE mode)
1006 {
1007 irlmp_client_t *client;
1008 irlmp_client_t *client_next;
1009
1010 IRDA_ASSERT(log != NULL, return;);
1011
1012 if (!(HASHBIN_GET_SIZE(log)))
1013 return;
1014
1015 /* For each client - notify callback may touch client list */
1016 client = (irlmp_client_t *) hashbin_get_first(irlmp->clients);
1017 while (NULL != hashbin_find_next(irlmp->clients, (long) client, NULL,
1018 (void *) &client_next) ) {
1019 /* Check if we should notify client */
1020 irlmp_notify_client(client, log, mode);
1021
1022 client = client_next;
1023 }
1024 }
1025
1026 /*
1027 * Function irlmp_discovery_expiry (expiry)
1028 *
1029 * This device is no longer been discovered, and therefore it is being
1030 * purged from the discovery log. Inform all clients who have
1031 * registered for this event...
1032 *
1033 * Note : called exclusively from discovery.c
1034 * Note : this is no longer called under discovery spinlock, so the
1035 * client can do whatever he wants in the callback.
1036 */
irlmp_discovery_expiry(discinfo_t * expiries,int number)1037 void irlmp_discovery_expiry(discinfo_t *expiries, int number)
1038 {
1039 irlmp_client_t *client;
1040 irlmp_client_t *client_next;
1041 int i;
1042
1043 IRDA_ASSERT(expiries != NULL, return;);
1044
1045 /* For each client - notify callback may touch client list */
1046 client = (irlmp_client_t *) hashbin_get_first(irlmp->clients);
1047 while (NULL != hashbin_find_next(irlmp->clients, (long) client, NULL,
1048 (void *) &client_next) ) {
1049
1050 /* Pass all entries to the listener */
1051 for(i = 0; i < number; i++) {
1052 /* Check if we should notify client */
1053 if ((client->expir_callback) &&
1054 (client->hint_mask.word &
1055 get_unaligned((__u16 *)expiries[i].hints)
1056 & 0x7f7f) )
1057 client->expir_callback(&(expiries[i]),
1058 EXPIRY_TIMEOUT,
1059 client->priv);
1060 }
1061
1062 /* Next client */
1063 client = client_next;
1064 }
1065 }
1066
1067 /*
1068 * Function irlmp_get_discovery_response ()
1069 *
1070 * Used by IrLAP to get the discovery info it needs when answering
1071 * discovery requests by other devices.
1072 */
irlmp_get_discovery_response(void)1073 discovery_t *irlmp_get_discovery_response(void)
1074 {
1075 IRDA_ASSERT(irlmp != NULL, return NULL;);
1076
1077 put_unaligned(irlmp->hints.word, (__u16 *)irlmp->discovery_rsp.data.hints);
1078
1079 /*
1080 * Set character set for device name (we use ASCII), and
1081 * copy device name. Remember to make room for a \0 at the
1082 * end
1083 */
1084 irlmp->discovery_rsp.data.charset = CS_ASCII;
1085
1086 strncpy(irlmp->discovery_rsp.data.info, sysctl_devname,
1087 NICKNAME_MAX_LEN);
1088 irlmp->discovery_rsp.name_len = strlen(irlmp->discovery_rsp.data.info);
1089
1090 return &irlmp->discovery_rsp;
1091 }
1092
1093 /*
1094 * Function irlmp_data_request (self, skb)
1095 *
1096 * Send some data to peer device
1097 *
1098 * Note on skb management :
1099 * After calling the lower layers of the IrDA stack, we always
1100 * kfree() the skb, which drop the reference count (and potentially
1101 * destroy it).
1102 * IrLMP and IrLAP may queue the packet, and in those cases will need
1103 * to use skb_get() to keep it around.
1104 * Jean II
1105 */
irlmp_data_request(struct lsap_cb * self,struct sk_buff * userdata)1106 int irlmp_data_request(struct lsap_cb *self, struct sk_buff *userdata)
1107 {
1108 int ret;
1109
1110 IRDA_ASSERT(self != NULL, return -1;);
1111 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
1112
1113 /* Make room for MUX header */
1114 IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER, return -1;);
1115 skb_push(userdata, LMP_HEADER);
1116
1117 ret = irlmp_do_lsap_event(self, LM_DATA_REQUEST, userdata);
1118
1119 /* Drop reference count - see irlap_data_request(). */
1120 dev_kfree_skb(userdata);
1121
1122 return ret;
1123 }
1124 EXPORT_SYMBOL(irlmp_data_request);
1125
1126 /*
1127 * Function irlmp_data_indication (handle, skb)
1128 *
1129 * Got data from LAP layer so pass it up to upper layer
1130 *
1131 */
irlmp_data_indication(struct lsap_cb * self,struct sk_buff * skb)1132 void irlmp_data_indication(struct lsap_cb *self, struct sk_buff *skb)
1133 {
1134 /* Hide LMP header from layer above */
1135 skb_pull(skb, LMP_HEADER);
1136
1137 if (self->notify.data_indication) {
1138 /* Don't forget to refcount it - see irlap_driver_rcv(). */
1139 skb_get(skb);
1140 self->notify.data_indication(self->notify.instance, self, skb);
1141 }
1142 }
1143
1144 /*
1145 * Function irlmp_udata_request (self, skb)
1146 */
irlmp_udata_request(struct lsap_cb * self,struct sk_buff * userdata)1147 int irlmp_udata_request(struct lsap_cb *self, struct sk_buff *userdata)
1148 {
1149 int ret;
1150
1151 IRDA_ASSERT(userdata != NULL, return -1;);
1152
1153 /* Make room for MUX header */
1154 IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER, return -1;);
1155 skb_push(userdata, LMP_HEADER);
1156
1157 ret = irlmp_do_lsap_event(self, LM_UDATA_REQUEST, userdata);
1158
1159 /* Drop reference count - see irlap_data_request(). */
1160 dev_kfree_skb(userdata);
1161
1162 return ret;
1163 }
1164
1165 /*
1166 * Function irlmp_udata_indication (self, skb)
1167 *
1168 * Send unreliable data (but still within the connection)
1169 *
1170 */
irlmp_udata_indication(struct lsap_cb * self,struct sk_buff * skb)1171 void irlmp_udata_indication(struct lsap_cb *self, struct sk_buff *skb)
1172 {
1173 IRDA_ASSERT(self != NULL, return;);
1174 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
1175 IRDA_ASSERT(skb != NULL, return;);
1176
1177 /* Hide LMP header from layer above */
1178 skb_pull(skb, LMP_HEADER);
1179
1180 if (self->notify.udata_indication) {
1181 /* Don't forget to refcount it - see irlap_driver_rcv(). */
1182 skb_get(skb);
1183 self->notify.udata_indication(self->notify.instance, self,
1184 skb);
1185 }
1186 }
1187
1188 /*
1189 * Function irlmp_connless_data_request (self, skb)
1190 */
1191 #ifdef CONFIG_IRDA_ULTRA
irlmp_connless_data_request(struct lsap_cb * self,struct sk_buff * userdata,__u8 pid)1192 int irlmp_connless_data_request(struct lsap_cb *self, struct sk_buff *userdata,
1193 __u8 pid)
1194 {
1195 struct sk_buff *clone_skb;
1196 struct lap_cb *lap;
1197
1198 IRDA_ASSERT(userdata != NULL, return -1;);
1199
1200 /* Make room for MUX and PID header */
1201 IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER+LMP_PID_HEADER,
1202 return -1;);
1203
1204 /* Insert protocol identifier */
1205 skb_push(userdata, LMP_PID_HEADER);
1206 if(self != NULL)
1207 userdata->data[0] = self->pid;
1208 else
1209 userdata->data[0] = pid;
1210
1211 /* Connectionless sockets must use 0x70 */
1212 skb_push(userdata, LMP_HEADER);
1213 userdata->data[0] = userdata->data[1] = LSAP_CONNLESS;
1214
1215 /* Try to send Connectionless packets out on all links */
1216 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
1217 while (lap != NULL) {
1218 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return -1;);
1219
1220 clone_skb = skb_clone(userdata, GFP_ATOMIC);
1221 if (!clone_skb) {
1222 dev_kfree_skb(userdata);
1223 return -ENOMEM;
1224 }
1225
1226 irlap_unitdata_request(lap->irlap, clone_skb);
1227 /* irlap_unitdata_request() don't increase refcount,
1228 * so no dev_kfree_skb() - Jean II */
1229
1230 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
1231 }
1232 dev_kfree_skb(userdata);
1233
1234 return 0;
1235 }
1236 #endif /* CONFIG_IRDA_ULTRA */
1237
1238 /*
1239 * Function irlmp_connless_data_indication (self, skb)
1240 *
1241 * Receive unreliable data outside any connection. Mostly used by Ultra
1242 *
1243 */
1244 #ifdef CONFIG_IRDA_ULTRA
irlmp_connless_data_indication(struct lsap_cb * self,struct sk_buff * skb)1245 void irlmp_connless_data_indication(struct lsap_cb *self, struct sk_buff *skb)
1246 {
1247 IRDA_ASSERT(self != NULL, return;);
1248 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
1249 IRDA_ASSERT(skb != NULL, return;);
1250
1251 /* Hide LMP and PID header from layer above */
1252 skb_pull(skb, LMP_HEADER+LMP_PID_HEADER);
1253
1254 if (self->notify.udata_indication) {
1255 /* Don't forget to refcount it - see irlap_driver_rcv(). */
1256 skb_get(skb);
1257 self->notify.udata_indication(self->notify.instance, self,
1258 skb);
1259 }
1260 }
1261 #endif /* CONFIG_IRDA_ULTRA */
1262
1263 /*
1264 * Propagate status indication from LAP to LSAPs (via LMP)
1265 * This don't trigger any change of state in lap_cb, lmp_cb or lsap_cb,
1266 * and the event is stateless, therefore we can bypass both state machines
1267 * and send the event direct to the LSAP user.
1268 * Jean II
1269 */
irlmp_status_indication(struct lap_cb * self,LINK_STATUS link,LOCK_STATUS lock)1270 void irlmp_status_indication(struct lap_cb *self,
1271 LINK_STATUS link, LOCK_STATUS lock)
1272 {
1273 struct lsap_cb *next;
1274 struct lsap_cb *curr;
1275
1276 /* Send status_indication to all LSAPs using this link */
1277 curr = (struct lsap_cb *) hashbin_get_first( self->lsaps);
1278 while (NULL != hashbin_find_next(self->lsaps, (long) curr, NULL,
1279 (void *) &next) ) {
1280 IRDA_ASSERT(curr->magic == LMP_LSAP_MAGIC, return;);
1281 /*
1282 * Inform service user if he has requested it
1283 */
1284 if (curr->notify.status_indication != NULL)
1285 curr->notify.status_indication(curr->notify.instance,
1286 link, lock);
1287 else
1288 pr_debug("%s(), no handler\n", __func__);
1289
1290 curr = next;
1291 }
1292 }
1293
1294 /*
1295 * Receive flow control indication from LAP.
1296 * LAP want us to send it one more frame. We implement a simple round
1297 * robin scheduler between the active sockets so that we get a bit of
1298 * fairness. Note that the round robin is far from perfect, but it's
1299 * better than nothing.
1300 * We then poll the selected socket so that we can do synchronous
1301 * refilling of IrLAP (which allow to minimise the number of buffers).
1302 * Jean II
1303 */
irlmp_flow_indication(struct lap_cb * self,LOCAL_FLOW flow)1304 void irlmp_flow_indication(struct lap_cb *self, LOCAL_FLOW flow)
1305 {
1306 struct lsap_cb *next;
1307 struct lsap_cb *curr;
1308 int lsap_todo;
1309
1310 IRDA_ASSERT(self->magic == LMP_LAP_MAGIC, return;);
1311 IRDA_ASSERT(flow == FLOW_START, return;);
1312
1313 /* Get the number of lsap. That's the only safe way to know
1314 * that we have looped around... - Jean II */
1315 lsap_todo = HASHBIN_GET_SIZE(self->lsaps);
1316 pr_debug("%s() : %d lsaps to scan\n", __func__, lsap_todo);
1317
1318 /* Poll lsap in order until the queue is full or until we
1319 * tried them all.
1320 * Most often, the current LSAP will have something to send,
1321 * so we will go through this loop only once. - Jean II */
1322 while((lsap_todo--) &&
1323 (IRLAP_GET_TX_QUEUE_LEN(self->irlap) < LAP_HIGH_THRESHOLD)) {
1324 /* Try to find the next lsap we should poll. */
1325 next = self->flow_next;
1326 /* If we have no lsap, restart from first one */
1327 if(next == NULL)
1328 next = (struct lsap_cb *) hashbin_get_first(self->lsaps);
1329 /* Verify current one and find the next one */
1330 curr = hashbin_find_next(self->lsaps, (long) next, NULL,
1331 (void *) &self->flow_next);
1332 /* Uh-oh... Paranoia */
1333 if(curr == NULL)
1334 break;
1335 pr_debug("%s() : curr is %p, next was %p and is now %p, still %d to go - queue len = %d\n",
1336 __func__, curr, next, self->flow_next, lsap_todo,
1337 IRLAP_GET_TX_QUEUE_LEN(self->irlap));
1338
1339 /* Inform lsap user that it can send one more packet. */
1340 if (curr->notify.flow_indication != NULL)
1341 curr->notify.flow_indication(curr->notify.instance,
1342 curr, flow);
1343 else
1344 pr_debug("%s(), no handler\n", __func__);
1345 }
1346 }
1347
1348 #if 0
1349 /*
1350 * Function irlmp_hint_to_service (hint)
1351 *
1352 * Returns a list of all servics contained in the given hint bits. This
1353 * function assumes that the hint bits have the size of two bytes only
1354 */
1355 __u8 *irlmp_hint_to_service(__u8 *hint)
1356 {
1357 __u8 *service;
1358 int i = 0;
1359
1360 /*
1361 * Allocate array to store services in. 16 entries should be safe
1362 * since we currently only support 2 hint bytes
1363 */
1364 service = kmalloc(16, GFP_ATOMIC);
1365 if (!service)
1366 return NULL;
1367
1368 if (!hint[0]) {
1369 pr_debug("<None>\n");
1370 kfree(service);
1371 return NULL;
1372 }
1373 if (hint[0] & HINT_PNP)
1374 pr_debug("PnP Compatible ");
1375 if (hint[0] & HINT_PDA)
1376 pr_debug("PDA/Palmtop ");
1377 if (hint[0] & HINT_COMPUTER)
1378 pr_debug("Computer ");
1379 if (hint[0] & HINT_PRINTER) {
1380 pr_debug("Printer ");
1381 service[i++] = S_PRINTER;
1382 }
1383 if (hint[0] & HINT_MODEM)
1384 pr_debug("Modem ");
1385 if (hint[0] & HINT_FAX)
1386 pr_debug("Fax ");
1387 if (hint[0] & HINT_LAN) {
1388 pr_debug("LAN Access ");
1389 service[i++] = S_LAN;
1390 }
1391 /*
1392 * Test if extension byte exists. This byte will usually be
1393 * there, but this is not really required by the standard.
1394 * (IrLMP p. 29)
1395 */
1396 if (hint[0] & HINT_EXTENSION) {
1397 if (hint[1] & HINT_TELEPHONY) {
1398 pr_debug("Telephony ");
1399 service[i++] = S_TELEPHONY;
1400 }
1401 if (hint[1] & HINT_FILE_SERVER)
1402 pr_debug("File Server ");
1403
1404 if (hint[1] & HINT_COMM) {
1405 pr_debug("IrCOMM ");
1406 service[i++] = S_COMM;
1407 }
1408 if (hint[1] & HINT_OBEX) {
1409 pr_debug("IrOBEX ");
1410 service[i++] = S_OBEX;
1411 }
1412 }
1413 pr_debug("\n");
1414
1415 /* So that client can be notified about any discovery */
1416 service[i++] = S_ANY;
1417
1418 service[i] = S_END;
1419
1420 return service;
1421 }
1422 #endif
1423
1424 static const __u16 service_hint_mapping[S_END][2] = {
1425 { HINT_PNP, 0 }, /* S_PNP */
1426 { HINT_PDA, 0 }, /* S_PDA */
1427 { HINT_COMPUTER, 0 }, /* S_COMPUTER */
1428 { HINT_PRINTER, 0 }, /* S_PRINTER */
1429 { HINT_MODEM, 0 }, /* S_MODEM */
1430 { HINT_FAX, 0 }, /* S_FAX */
1431 { HINT_LAN, 0 }, /* S_LAN */
1432 { HINT_EXTENSION, HINT_TELEPHONY }, /* S_TELEPHONY */
1433 { HINT_EXTENSION, HINT_COMM }, /* S_COMM */
1434 { HINT_EXTENSION, HINT_OBEX }, /* S_OBEX */
1435 { 0xFF, 0xFF }, /* S_ANY */
1436 };
1437
1438 /*
1439 * Function irlmp_service_to_hint (service)
1440 *
1441 * Converts a service type, to a hint bit
1442 *
1443 * Returns: a 16 bit hint value, with the service bit set
1444 */
irlmp_service_to_hint(int service)1445 __u16 irlmp_service_to_hint(int service)
1446 {
1447 __u16_host_order hint;
1448
1449 hint.byte[0] = service_hint_mapping[service][0];
1450 hint.byte[1] = service_hint_mapping[service][1];
1451
1452 return hint.word;
1453 }
1454 EXPORT_SYMBOL(irlmp_service_to_hint);
1455
1456 /*
1457 * Function irlmp_register_service (service)
1458 *
1459 * Register local service with IrLMP
1460 *
1461 */
irlmp_register_service(__u16 hints)1462 void *irlmp_register_service(__u16 hints)
1463 {
1464 irlmp_service_t *service;
1465
1466 pr_debug("%s(), hints = %04x\n", __func__, hints);
1467
1468 /* Make a new registration */
1469 service = kmalloc(sizeof(irlmp_service_t), GFP_ATOMIC);
1470 if (!service)
1471 return NULL;
1472
1473 service->hints.word = hints;
1474 hashbin_insert(irlmp->services, (irda_queue_t *) service,
1475 (long) service, NULL);
1476
1477 irlmp->hints.word |= hints;
1478
1479 return (void *)service;
1480 }
1481 EXPORT_SYMBOL(irlmp_register_service);
1482
1483 /*
1484 * Function irlmp_unregister_service (handle)
1485 *
1486 * Unregister service with IrLMP.
1487 *
1488 * Returns: 0 on success, -1 on error
1489 */
irlmp_unregister_service(void * handle)1490 int irlmp_unregister_service(void *handle)
1491 {
1492 irlmp_service_t *service;
1493 unsigned long flags;
1494
1495 if (!handle)
1496 return -1;
1497
1498 /* Caller may call with invalid handle (it's legal) - Jean II */
1499 service = hashbin_lock_find(irlmp->services, (long) handle, NULL);
1500 if (!service) {
1501 pr_debug("%s(), Unknown service!\n", __func__);
1502 return -1;
1503 }
1504
1505 hashbin_remove_this(irlmp->services, (irda_queue_t *) service);
1506 kfree(service);
1507
1508 /* Remove old hint bits */
1509 irlmp->hints.word = 0;
1510
1511 /* Refresh current hint bits */
1512 spin_lock_irqsave(&irlmp->services->hb_spinlock, flags);
1513 service = (irlmp_service_t *) hashbin_get_first(irlmp->services);
1514 while (service) {
1515 irlmp->hints.word |= service->hints.word;
1516
1517 service = (irlmp_service_t *)hashbin_get_next(irlmp->services);
1518 }
1519 spin_unlock_irqrestore(&irlmp->services->hb_spinlock, flags);
1520 return 0;
1521 }
1522 EXPORT_SYMBOL(irlmp_unregister_service);
1523
1524 /*
1525 * Function irlmp_register_client (hint_mask, callback1, callback2)
1526 *
1527 * Register a local client with IrLMP
1528 * First callback is selective discovery (based on hints)
1529 * Second callback is for selective discovery expiries
1530 *
1531 * Returns: handle > 0 on success, 0 on error
1532 */
irlmp_register_client(__u16 hint_mask,DISCOVERY_CALLBACK1 disco_clb,DISCOVERY_CALLBACK2 expir_clb,void * priv)1533 void *irlmp_register_client(__u16 hint_mask, DISCOVERY_CALLBACK1 disco_clb,
1534 DISCOVERY_CALLBACK2 expir_clb, void *priv)
1535 {
1536 irlmp_client_t *client;
1537
1538 IRDA_ASSERT(irlmp != NULL, return NULL;);
1539
1540 /* Make a new registration */
1541 client = kmalloc(sizeof(irlmp_client_t), GFP_ATOMIC);
1542 if (!client)
1543 return NULL;
1544
1545 /* Register the details */
1546 client->hint_mask.word = hint_mask;
1547 client->disco_callback = disco_clb;
1548 client->expir_callback = expir_clb;
1549 client->priv = priv;
1550
1551 hashbin_insert(irlmp->clients, (irda_queue_t *) client,
1552 (long) client, NULL);
1553
1554 return (void *) client;
1555 }
1556 EXPORT_SYMBOL(irlmp_register_client);
1557
1558 /*
1559 * Function irlmp_update_client (handle, hint_mask, callback1, callback2)
1560 *
1561 * Updates specified client (handle) with possibly new hint_mask and
1562 * callback
1563 *
1564 * Returns: 0 on success, -1 on error
1565 */
irlmp_update_client(void * handle,__u16 hint_mask,DISCOVERY_CALLBACK1 disco_clb,DISCOVERY_CALLBACK2 expir_clb,void * priv)1566 int irlmp_update_client(void *handle, __u16 hint_mask,
1567 DISCOVERY_CALLBACK1 disco_clb,
1568 DISCOVERY_CALLBACK2 expir_clb, void *priv)
1569 {
1570 irlmp_client_t *client;
1571
1572 if (!handle)
1573 return -1;
1574
1575 client = hashbin_lock_find(irlmp->clients, (long) handle, NULL);
1576 if (!client) {
1577 pr_debug("%s(), Unknown client!\n", __func__);
1578 return -1;
1579 }
1580
1581 client->hint_mask.word = hint_mask;
1582 client->disco_callback = disco_clb;
1583 client->expir_callback = expir_clb;
1584 client->priv = priv;
1585
1586 return 0;
1587 }
1588 EXPORT_SYMBOL(irlmp_update_client);
1589
1590 /*
1591 * Function irlmp_unregister_client (handle)
1592 *
1593 * Returns: 0 on success, -1 on error
1594 *
1595 */
irlmp_unregister_client(void * handle)1596 int irlmp_unregister_client(void *handle)
1597 {
1598 struct irlmp_client *client;
1599
1600 if (!handle)
1601 return -1;
1602
1603 /* Caller may call with invalid handle (it's legal) - Jean II */
1604 client = hashbin_lock_find(irlmp->clients, (long) handle, NULL);
1605 if (!client) {
1606 pr_debug("%s(), Unknown client!\n", __func__);
1607 return -1;
1608 }
1609
1610 pr_debug("%s(), removing client!\n", __func__);
1611 hashbin_remove_this(irlmp->clients, (irda_queue_t *) client);
1612 kfree(client);
1613
1614 return 0;
1615 }
1616 EXPORT_SYMBOL(irlmp_unregister_client);
1617
1618 /*
1619 * Function irlmp_slsap_inuse (slsap)
1620 *
1621 * Check if the given source LSAP selector is in use
1622 *
1623 * This function is clearly not very efficient. On the mitigating side, the
1624 * stack make sure that in 99% of the cases, we are called only once
1625 * for each socket allocation. We could probably keep a bitmap
1626 * of the allocated LSAP, but I'm not sure the complexity is worth it.
1627 * Jean II
1628 */
irlmp_slsap_inuse(__u8 slsap_sel)1629 static int irlmp_slsap_inuse(__u8 slsap_sel)
1630 {
1631 struct lsap_cb *self;
1632 struct lap_cb *lap;
1633 unsigned long flags;
1634
1635 IRDA_ASSERT(irlmp != NULL, return TRUE;);
1636 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return TRUE;);
1637 IRDA_ASSERT(slsap_sel != LSAP_ANY, return TRUE;);
1638
1639 #ifdef CONFIG_IRDA_ULTRA
1640 /* Accept all bindings to the connectionless LSAP */
1641 if (slsap_sel == LSAP_CONNLESS)
1642 return FALSE;
1643 #endif /* CONFIG_IRDA_ULTRA */
1644
1645 /* Valid values are between 0 and 127 (0x0-0x6F) */
1646 if (slsap_sel > LSAP_MAX)
1647 return TRUE;
1648
1649 /*
1650 * Check if slsap is already in use. To do this we have to loop over
1651 * every IrLAP connection and check every LSAP associated with each
1652 * the connection.
1653 */
1654 spin_lock_irqsave_nested(&irlmp->links->hb_spinlock, flags,
1655 SINGLE_DEPTH_NESTING);
1656 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
1657 while (lap != NULL) {
1658 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, goto errlap;);
1659
1660 /* Careful for priority inversions here !
1661 * irlmp->links is never taken while another IrDA
1662 * spinlock is held, so we are safe. Jean II */
1663 spin_lock(&lap->lsaps->hb_spinlock);
1664
1665 /* For this IrLAP, check all the LSAPs */
1666 self = (struct lsap_cb *) hashbin_get_first(lap->lsaps);
1667 while (self != NULL) {
1668 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC,
1669 goto errlsap;);
1670
1671 if ((self->slsap_sel == slsap_sel)) {
1672 pr_debug("Source LSAP selector=%02x in use\n",
1673 self->slsap_sel);
1674 goto errlsap;
1675 }
1676 self = (struct lsap_cb*) hashbin_get_next(lap->lsaps);
1677 }
1678 spin_unlock(&lap->lsaps->hb_spinlock);
1679
1680 /* Next LAP */
1681 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
1682 }
1683 spin_unlock_irqrestore(&irlmp->links->hb_spinlock, flags);
1684
1685 /*
1686 * Server sockets are typically waiting for connections and
1687 * therefore reside in the unconnected list. We don't want
1688 * to give out their LSAPs for obvious reasons...
1689 * Jean II
1690 */
1691 spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);
1692
1693 self = (struct lsap_cb *) hashbin_get_first(irlmp->unconnected_lsaps);
1694 while (self != NULL) {
1695 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, goto erruncon;);
1696 if ((self->slsap_sel == slsap_sel)) {
1697 pr_debug("Source LSAP selector=%02x in use (unconnected)\n",
1698 self->slsap_sel);
1699 goto erruncon;
1700 }
1701 self = (struct lsap_cb*) hashbin_get_next(irlmp->unconnected_lsaps);
1702 }
1703 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
1704
1705 return FALSE;
1706
1707 /* Error exit from within one of the two nested loops.
1708 * Make sure we release the right spinlock in the righ order.
1709 * Jean II */
1710 errlsap:
1711 spin_unlock(&lap->lsaps->hb_spinlock);
1712 IRDA_ASSERT_LABEL(errlap:)
1713 spin_unlock_irqrestore(&irlmp->links->hb_spinlock, flags);
1714 return TRUE;
1715
1716 /* Error exit from within the unconnected loop.
1717 * Just one spinlock to release... Jean II */
1718 erruncon:
1719 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
1720 return TRUE;
1721 }
1722
1723 /*
1724 * Function irlmp_find_free_slsap ()
1725 *
1726 * Find a free source LSAP to use. This function is called if the service
1727 * user has requested a source LSAP equal to LM_ANY
1728 */
irlmp_find_free_slsap(void)1729 static __u8 irlmp_find_free_slsap(void)
1730 {
1731 __u8 lsap_sel;
1732 int wrapped = 0;
1733
1734 IRDA_ASSERT(irlmp != NULL, return -1;);
1735 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return -1;);
1736
1737 /* Most users don't really care which LSAPs they are given,
1738 * and therefore we automatically give them a free LSAP.
1739 * This function try to find a suitable LSAP, i.e. which is
1740 * not in use and is within the acceptable range. Jean II */
1741
1742 do {
1743 /* Always increment to LSAP number before using it.
1744 * In theory, we could reuse the last LSAP number, as long
1745 * as it is no longer in use. Some IrDA stack do that.
1746 * However, the previous socket may be half closed, i.e.
1747 * we closed it, we think it's no longer in use, but the
1748 * other side did not receive our close and think it's
1749 * active and still send data on it.
1750 * This is similar to what is done with PIDs and TCP ports.
1751 * Also, this reduce the number of calls to irlmp_slsap_inuse()
1752 * which is an expensive function to call.
1753 * Jean II */
1754 irlmp->last_lsap_sel++;
1755
1756 /* Check if we need to wraparound (0x70-0x7f are reserved) */
1757 if (irlmp->last_lsap_sel > LSAP_MAX) {
1758 /* 0x00-0x10 are also reserved for well know ports */
1759 irlmp->last_lsap_sel = 0x10;
1760
1761 /* Make sure we terminate the loop */
1762 if (wrapped++) {
1763 net_err_ratelimited("%s: no more free LSAPs !\n",
1764 __func__);
1765 return 0;
1766 }
1767 }
1768
1769 /* If the LSAP is in use, try the next one.
1770 * Despite the autoincrement, we need to check if the lsap
1771 * is really in use or not, first because LSAP may be
1772 * directly allocated in irlmp_open_lsap(), and also because
1773 * we may wraparound on old sockets. Jean II */
1774 } while (irlmp_slsap_inuse(irlmp->last_lsap_sel));
1775
1776 /* Got it ! */
1777 lsap_sel = irlmp->last_lsap_sel;
1778 pr_debug("%s(), found free lsap_sel=%02x\n",
1779 __func__, lsap_sel);
1780
1781 return lsap_sel;
1782 }
1783
1784 /*
1785 * Function irlmp_convert_lap_reason (lap_reason)
1786 *
1787 * Converts IrLAP disconnect reason codes to IrLMP disconnect reason
1788 * codes
1789 *
1790 */
irlmp_convert_lap_reason(LAP_REASON lap_reason)1791 LM_REASON irlmp_convert_lap_reason( LAP_REASON lap_reason)
1792 {
1793 int reason = LM_LAP_DISCONNECT;
1794
1795 switch (lap_reason) {
1796 case LAP_DISC_INDICATION: /* Received a disconnect request from peer */
1797 pr_debug("%s(), LAP_DISC_INDICATION\n", __func__);
1798 reason = LM_USER_REQUEST;
1799 break;
1800 case LAP_NO_RESPONSE: /* To many retransmits without response */
1801 pr_debug("%s(), LAP_NO_RESPONSE\n", __func__);
1802 reason = LM_LAP_DISCONNECT;
1803 break;
1804 case LAP_RESET_INDICATION:
1805 pr_debug("%s(), LAP_RESET_INDICATION\n", __func__);
1806 reason = LM_LAP_RESET;
1807 break;
1808 case LAP_FOUND_NONE:
1809 case LAP_MEDIA_BUSY:
1810 case LAP_PRIMARY_CONFLICT:
1811 pr_debug("%s(), LAP_FOUND_NONE, LAP_MEDIA_BUSY or LAP_PRIMARY_CONFLICT\n",
1812 __func__);
1813 reason = LM_CONNECT_FAILURE;
1814 break;
1815 default:
1816 pr_debug("%s(), Unknown IrLAP disconnect reason %d!\n",
1817 __func__, lap_reason);
1818 reason = LM_LAP_DISCONNECT;
1819 break;
1820 }
1821
1822 return reason;
1823 }
1824
1825 #ifdef CONFIG_PROC_FS
1826
1827 struct irlmp_iter_state {
1828 hashbin_t *hashbin;
1829 };
1830
1831 #define LSAP_START_TOKEN ((void *)1)
1832 #define LINK_START_TOKEN ((void *)2)
1833
irlmp_seq_hb_idx(struct irlmp_iter_state * iter,loff_t * off)1834 static void *irlmp_seq_hb_idx(struct irlmp_iter_state *iter, loff_t *off)
1835 {
1836 void *element;
1837
1838 spin_lock_irq(&iter->hashbin->hb_spinlock);
1839 for (element = hashbin_get_first(iter->hashbin);
1840 element != NULL;
1841 element = hashbin_get_next(iter->hashbin)) {
1842 if (!off || (*off)-- == 0) {
1843 /* NB: hashbin left locked */
1844 return element;
1845 }
1846 }
1847 spin_unlock_irq(&iter->hashbin->hb_spinlock);
1848 iter->hashbin = NULL;
1849 return NULL;
1850 }
1851
1852
irlmp_seq_start(struct seq_file * seq,loff_t * pos)1853 static void *irlmp_seq_start(struct seq_file *seq, loff_t *pos)
1854 {
1855 struct irlmp_iter_state *iter = seq->private;
1856 void *v;
1857 loff_t off = *pos;
1858
1859 iter->hashbin = NULL;
1860 if (off-- == 0)
1861 return LSAP_START_TOKEN;
1862
1863 iter->hashbin = irlmp->unconnected_lsaps;
1864 v = irlmp_seq_hb_idx(iter, &off);
1865 if (v)
1866 return v;
1867
1868 if (off-- == 0)
1869 return LINK_START_TOKEN;
1870
1871 iter->hashbin = irlmp->links;
1872 return irlmp_seq_hb_idx(iter, &off);
1873 }
1874
irlmp_seq_next(struct seq_file * seq,void * v,loff_t * pos)1875 static void *irlmp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1876 {
1877 struct irlmp_iter_state *iter = seq->private;
1878
1879 ++*pos;
1880
1881 if (v == LSAP_START_TOKEN) { /* start of list of lsaps */
1882 iter->hashbin = irlmp->unconnected_lsaps;
1883 v = irlmp_seq_hb_idx(iter, NULL);
1884 return v ? v : LINK_START_TOKEN;
1885 }
1886
1887 if (v == LINK_START_TOKEN) { /* start of list of links */
1888 iter->hashbin = irlmp->links;
1889 return irlmp_seq_hb_idx(iter, NULL);
1890 }
1891
1892 v = hashbin_get_next(iter->hashbin);
1893
1894 if (v == NULL) { /* no more in this hash bin */
1895 spin_unlock_irq(&iter->hashbin->hb_spinlock);
1896
1897 if (iter->hashbin == irlmp->unconnected_lsaps)
1898 v = LINK_START_TOKEN;
1899
1900 iter->hashbin = NULL;
1901 }
1902 return v;
1903 }
1904
irlmp_seq_stop(struct seq_file * seq,void * v)1905 static void irlmp_seq_stop(struct seq_file *seq, void *v)
1906 {
1907 struct irlmp_iter_state *iter = seq->private;
1908
1909 if (iter->hashbin)
1910 spin_unlock_irq(&iter->hashbin->hb_spinlock);
1911 }
1912
irlmp_seq_show(struct seq_file * seq,void * v)1913 static int irlmp_seq_show(struct seq_file *seq, void *v)
1914 {
1915 const struct irlmp_iter_state *iter = seq->private;
1916 struct lsap_cb *self = v;
1917
1918 if (v == LSAP_START_TOKEN)
1919 seq_puts(seq, "Unconnected LSAPs:\n");
1920 else if (v == LINK_START_TOKEN)
1921 seq_puts(seq, "\nRegistered Link Layers:\n");
1922 else if (iter->hashbin == irlmp->unconnected_lsaps) {
1923 self = v;
1924 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -EINVAL; );
1925 seq_printf(seq, "lsap state: %s, ",
1926 irlsap_state[ self->lsap_state]);
1927 seq_printf(seq,
1928 "slsap_sel: %#02x, dlsap_sel: %#02x, ",
1929 self->slsap_sel, self->dlsap_sel);
1930 seq_printf(seq, "(%s)", self->notify.name);
1931 seq_printf(seq, "\n");
1932 } else if (iter->hashbin == irlmp->links) {
1933 struct lap_cb *lap = v;
1934
1935 seq_printf(seq, "lap state: %s, ",
1936 irlmp_state[lap->lap_state]);
1937
1938 seq_printf(seq, "saddr: %#08x, daddr: %#08x, ",
1939 lap->saddr, lap->daddr);
1940 seq_printf(seq, "num lsaps: %d",
1941 HASHBIN_GET_SIZE(lap->lsaps));
1942 seq_printf(seq, "\n");
1943
1944 /* Careful for priority inversions here !
1945 * All other uses of attrib spinlock are independent of
1946 * the object spinlock, so we are safe. Jean II */
1947 spin_lock(&lap->lsaps->hb_spinlock);
1948
1949 seq_printf(seq, "\n Connected LSAPs:\n");
1950 for (self = (struct lsap_cb *) hashbin_get_first(lap->lsaps);
1951 self != NULL;
1952 self = (struct lsap_cb *)hashbin_get_next(lap->lsaps)) {
1953 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC,
1954 goto outloop;);
1955 seq_printf(seq, " lsap state: %s, ",
1956 irlsap_state[ self->lsap_state]);
1957 seq_printf(seq,
1958 "slsap_sel: %#02x, dlsap_sel: %#02x, ",
1959 self->slsap_sel, self->dlsap_sel);
1960 seq_printf(seq, "(%s)", self->notify.name);
1961 seq_putc(seq, '\n');
1962
1963 }
1964 IRDA_ASSERT_LABEL(outloop:)
1965 spin_unlock(&lap->lsaps->hb_spinlock);
1966 seq_putc(seq, '\n');
1967 } else
1968 return -EINVAL;
1969
1970 return 0;
1971 }
1972
1973 static const struct seq_operations irlmp_seq_ops = {
1974 .start = irlmp_seq_start,
1975 .next = irlmp_seq_next,
1976 .stop = irlmp_seq_stop,
1977 .show = irlmp_seq_show,
1978 };
1979
irlmp_seq_open(struct inode * inode,struct file * file)1980 static int irlmp_seq_open(struct inode *inode, struct file *file)
1981 {
1982 IRDA_ASSERT(irlmp != NULL, return -EINVAL;);
1983
1984 return seq_open_private(file, &irlmp_seq_ops,
1985 sizeof(struct irlmp_iter_state));
1986 }
1987
1988 const struct file_operations irlmp_seq_fops = {
1989 .owner = THIS_MODULE,
1990 .open = irlmp_seq_open,
1991 .read = seq_read,
1992 .llseek = seq_lseek,
1993 .release = seq_release_private,
1994 };
1995
1996 #endif /* PROC_FS */
1997