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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
48static __u8 irlmp_find_free_slsap(void);
49static int irlmp_slsap_inuse(__u8 slsap_sel);
50
51/* Master structure */
52struct irlmp_cb *irlmp = NULL;
53
54/* These can be altered by the sysctl interface */
55int sysctl_discovery = 0;
56int sysctl_discovery_timeout = 3; /* 3 seconds by default */
57int sysctl_discovery_slots = 6; /* 6 slots by default */
58int sysctl_lap_keepalive_time = LM_IDLE_TIMEOUT * 1000 / HZ;
59char sysctl_devname[65];
60
61static 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
72const 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 */
84int __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 */
128void 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 */
153struct 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}
200EXPORT_SYMBOL(irlmp_open_lsap);
201
202/*
203 * Function __irlmp_close_lsap (self)
204 *
205 * Remove an instance of LSAP
206 */
207static 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 */
230void 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}
273EXPORT_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 */
282void 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 */
335void 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 */
368int 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
497err:
498 /* Cleanup */
499 if(tx_skb)
500 dev_kfree_skb(tx_skb);
501 return ret;
502}
503EXPORT_SYMBOL(irlmp_connect_request);
504
505/*
506 * Function irlmp_connect_indication (self)
507 *
508 * Incoming connection
509 *
510 */
511void 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 */
554int 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}
577EXPORT_SYMBOL(irlmp_connect_response);
578
579/*
580 * Function irlmp_connect_confirm (handle, skb)
581 *
582 * LSAP connection confirmed peer device!
583 */
584void 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 */
623struct 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 */
677int 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}
732EXPORT_SYMBOL(irlmp_disconnect_request);
733
734/*
735 * Function irlmp_disconnect_indication (reason, userdata)
736 *
737 * LSAP is being closed!
738 */
739void 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 */
802void 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 */
835void 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 */
887void 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}
907EXPORT_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 */
917struct 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}
939EXPORT_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 */
953static inline void
954irlmp_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 */
1005void 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 */
1037void 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 */
1073discovery_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 */
1106int 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}
1124EXPORT_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 */
1132void 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 */
1147int 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 */
1171void 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
1192int 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
1245void 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 */
1270void 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 */
1304void 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
1424static 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 */
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}
1454EXPORT_SYMBOL(irlmp_service_to_hint);
1455
1456/*
1457 * Function irlmp_register_service (service)
1458 *
1459 * Register local service with IrLMP
1460 *
1461 */
1462void *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}
1481EXPORT_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 */
1490int 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}
1522EXPORT_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 */
1533void *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}
1556EXPORT_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 */
1566int 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}
1588EXPORT_SYMBOL(irlmp_update_client);
1589
1590/*
1591 * Function irlmp_unregister_client (handle)
1592 *
1593 * Returns: 0 on success, -1 on error
1594 *
1595 */
1596int 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}
1616EXPORT_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 */
1629static 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 */
1710errlsap:
1711 spin_unlock(&lap->lsaps->hb_spinlock);
1712IRDA_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 */
1718erruncon:
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 */
1729static __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 */
1791LM_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
1827struct irlmp_iter_state {
1828 hashbin_t *hashbin;
1829};
1830
1831#define LSAP_START_TOKEN ((void *)1)
1832#define LINK_START_TOKEN ((void *)2)
1833
1834static 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
1853static 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
1875static 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
1905static 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
1913static 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
1973static 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
1980static 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
1988const 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 */
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
48static __u8 irlmp_find_free_slsap(void);
49static int irlmp_slsap_inuse(__u8 slsap_sel);
50
51/* Master structure */
52struct irlmp_cb *irlmp = NULL;
53
54/* These can be altered by the sysctl interface */
55int sysctl_discovery = 0;
56int sysctl_discovery_timeout = 3; /* 3 seconds by default */
57int sysctl_discovery_slots = 6; /* 6 slots by default */
58int sysctl_lap_keepalive_time = LM_IDLE_TIMEOUT * 1000 / HZ;
59char sysctl_devname[65];
60
61const 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};
70
71/*
72 * Function irlmp_init (void)
73 *
74 * Create (allocate) the main IrLMP structure
75 *
76 */
77int __init irlmp_init(void)
78{
79 IRDA_DEBUG(1, "%s()\n", __func__);
80 /* Initialize the irlmp structure. */
81 irlmp = kzalloc( sizeof(struct irlmp_cb), GFP_KERNEL);
82 if (irlmp == NULL)
83 return -ENOMEM;
84
85 irlmp->magic = LMP_MAGIC;
86
87 irlmp->clients = hashbin_new(HB_LOCK);
88 irlmp->services = hashbin_new(HB_LOCK);
89 irlmp->links = hashbin_new(HB_LOCK);
90 irlmp->unconnected_lsaps = hashbin_new(HB_LOCK);
91 irlmp->cachelog = hashbin_new(HB_NOLOCK);
92
93 if ((irlmp->clients == NULL) ||
94 (irlmp->services == NULL) ||
95 (irlmp->links == NULL) ||
96 (irlmp->unconnected_lsaps == NULL) ||
97 (irlmp->cachelog == NULL)) {
98 return -ENOMEM;
99 }
100
101 spin_lock_init(&irlmp->cachelog->hb_spinlock);
102
103 irlmp->last_lsap_sel = 0x0f; /* Reserved 0x00-0x0f */
104 strcpy(sysctl_devname, "Linux");
105
106 init_timer(&irlmp->discovery_timer);
107
108 /* Do discovery every 3 seconds, conditionally */
109 if (sysctl_discovery)
110 irlmp_start_discovery_timer(irlmp,
111 sysctl_discovery_timeout*HZ);
112
113 return 0;
114}
115
116/*
117 * Function irlmp_cleanup (void)
118 *
119 * Remove IrLMP layer
120 *
121 */
122void irlmp_cleanup(void)
123{
124 /* Check for main structure */
125 IRDA_ASSERT(irlmp != NULL, return;);
126 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
127
128 del_timer(&irlmp->discovery_timer);
129
130 hashbin_delete(irlmp->links, (FREE_FUNC) kfree);
131 hashbin_delete(irlmp->unconnected_lsaps, (FREE_FUNC) kfree);
132 hashbin_delete(irlmp->clients, (FREE_FUNC) kfree);
133 hashbin_delete(irlmp->services, (FREE_FUNC) kfree);
134 hashbin_delete(irlmp->cachelog, (FREE_FUNC) kfree);
135
136 /* De-allocate main structure */
137 kfree(irlmp);
138 irlmp = NULL;
139}
140
141/*
142 * Function irlmp_open_lsap (slsap, notify)
143 *
144 * Register with IrLMP and create a local LSAP,
145 * returns handle to LSAP.
146 */
147struct lsap_cb *irlmp_open_lsap(__u8 slsap_sel, notify_t *notify, __u8 pid)
148{
149 struct lsap_cb *self;
150
151 IRDA_ASSERT(notify != NULL, return NULL;);
152 IRDA_ASSERT(irlmp != NULL, return NULL;);
153 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return NULL;);
154 IRDA_ASSERT(notify->instance != NULL, return NULL;);
155
156 /* Does the client care which Source LSAP selector it gets? */
157 if (slsap_sel == LSAP_ANY) {
158 slsap_sel = irlmp_find_free_slsap();
159 if (!slsap_sel)
160 return NULL;
161 } else if (irlmp_slsap_inuse(slsap_sel))
162 return NULL;
163
164 /* Allocate new instance of a LSAP connection */
165 self = kzalloc(sizeof(struct lsap_cb), GFP_ATOMIC);
166 if (self == NULL) {
167 IRDA_ERROR("%s: can't allocate memory\n", __func__);
168 return NULL;
169 }
170
171 self->magic = LMP_LSAP_MAGIC;
172 self->slsap_sel = slsap_sel;
173
174 /* Fix connectionless LSAP's */
175 if (slsap_sel == LSAP_CONNLESS) {
176#ifdef CONFIG_IRDA_ULTRA
177 self->dlsap_sel = LSAP_CONNLESS;
178 self->pid = pid;
179#endif /* CONFIG_IRDA_ULTRA */
180 } else
181 self->dlsap_sel = LSAP_ANY;
182 /* self->connected = FALSE; -> already NULL via memset() */
183
184 init_timer(&self->watchdog_timer);
185
186 self->notify = *notify;
187
188 self->lsap_state = LSAP_DISCONNECTED;
189
190 /* Insert into queue of unconnected LSAPs */
191 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
192 (long) self, NULL);
193
194 return self;
195}
196EXPORT_SYMBOL(irlmp_open_lsap);
197
198/*
199 * Function __irlmp_close_lsap (self)
200 *
201 * Remove an instance of LSAP
202 */
203static void __irlmp_close_lsap(struct lsap_cb *self)
204{
205 IRDA_DEBUG(4, "%s()\n", __func__);
206
207 IRDA_ASSERT(self != NULL, return;);
208 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
209
210 /*
211 * Set some of the variables to preset values
212 */
213 self->magic = 0;
214 del_timer(&self->watchdog_timer); /* Important! */
215
216 if (self->conn_skb)
217 dev_kfree_skb(self->conn_skb);
218
219 kfree(self);
220}
221
222/*
223 * Function irlmp_close_lsap (self)
224 *
225 * Close and remove LSAP
226 *
227 */
228void irlmp_close_lsap(struct lsap_cb *self)
229{
230 struct lap_cb *lap;
231 struct lsap_cb *lsap = NULL;
232
233 IRDA_ASSERT(self != NULL, return;);
234 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
235
236 /*
237 * Find out if we should remove this LSAP from a link or from the
238 * list of unconnected lsaps (not associated with a link)
239 */
240 lap = self->lap;
241 if (lap) {
242 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
243 /* We might close a LSAP before it has completed the
244 * connection setup. In those case, higher layers won't
245 * send a proper disconnect request. Harmless, except
246 * that we will forget to close LAP... - Jean II */
247 if(self->lsap_state != LSAP_DISCONNECTED) {
248 self->lsap_state = LSAP_DISCONNECTED;
249 irlmp_do_lap_event(self->lap,
250 LM_LAP_DISCONNECT_REQUEST, NULL);
251 }
252 /* Now, remove from the link */
253 lsap = hashbin_remove(lap->lsaps, (long) self, NULL);
254#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
255 lap->cache.valid = FALSE;
256#endif
257 }
258 self->lap = NULL;
259 /* Check if we found the LSAP! If not then try the unconnected lsaps */
260 if (!lsap) {
261 lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self,
262 NULL);
263 }
264 if (!lsap) {
265 IRDA_DEBUG(0,
266 "%s(), Looks like somebody has removed me already!\n",
267 __func__);
268 return;
269 }
270 __irlmp_close_lsap(self);
271}
272EXPORT_SYMBOL(irlmp_close_lsap);
273
274/*
275 * Function irlmp_register_irlap (saddr, notify)
276 *
277 * Register IrLAP layer with IrLMP. There is possible to have multiple
278 * instances of the IrLAP layer, each connected to different IrDA ports
279 *
280 */
281void irlmp_register_link(struct irlap_cb *irlap, __u32 saddr, notify_t *notify)
282{
283 struct lap_cb *lap;
284
285 IRDA_ASSERT(irlmp != NULL, return;);
286 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
287 IRDA_ASSERT(notify != NULL, return;);
288
289 /*
290 * Allocate new instance of a LSAP connection
291 */
292 lap = kzalloc(sizeof(struct lap_cb), GFP_KERNEL);
293 if (lap == NULL) {
294 IRDA_ERROR("%s: unable to kmalloc\n", __func__);
295 return;
296 }
297
298 lap->irlap = irlap;
299 lap->magic = LMP_LAP_MAGIC;
300 lap->saddr = saddr;
301 lap->daddr = DEV_ADDR_ANY;
302#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
303 lap->cache.valid = FALSE;
304#endif
305 lap->lsaps = hashbin_new(HB_LOCK);
306 if (lap->lsaps == NULL) {
307 IRDA_WARNING("%s(), unable to kmalloc lsaps\n", __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 */
335void irlmp_unregister_link(__u32 saddr)
336{
337 struct lap_cb *link;
338
339 IRDA_DEBUG(4, "%s()\n", __func__);
340
341 /* We must remove ourselves from the hashbin *first*. This ensure
342 * that no more LSAPs will be open on this link and no discovery
343 * will be triggered anymore. Jean II */
344 link = hashbin_remove(irlmp->links, saddr, NULL);
345 if (link) {
346 IRDA_ASSERT(link->magic == LMP_LAP_MAGIC, return;);
347
348 /* Kill all the LSAPs on this link. Jean II */
349 link->reason = LAP_DISC_INDICATION;
350 link->daddr = DEV_ADDR_ANY;
351 irlmp_do_lap_event(link, LM_LAP_DISCONNECT_INDICATION, NULL);
352
353 /* Remove all discoveries discovered at this link */
354 irlmp_expire_discoveries(irlmp->cachelog, link->saddr, TRUE);
355
356 /* Final cleanup */
357 del_timer(&link->idle_timer);
358 link->magic = 0;
359 hashbin_delete(link->lsaps, (FREE_FUNC) __irlmp_close_lsap);
360 kfree(link);
361 }
362}
363
364/*
365 * Function irlmp_connect_request (handle, dlsap, userdata)
366 *
367 * Connect with a peer LSAP
368 *
369 */
370int irlmp_connect_request(struct lsap_cb *self, __u8 dlsap_sel,
371 __u32 saddr, __u32 daddr,
372 struct qos_info *qos, struct sk_buff *userdata)
373{
374 struct sk_buff *tx_skb = userdata;
375 struct lap_cb *lap;
376 struct lsap_cb *lsap;
377 int ret;
378
379 IRDA_ASSERT(self != NULL, return -EBADR;);
380 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -EBADR;);
381
382 IRDA_DEBUG(2,
383 "%s(), slsap_sel=%02x, dlsap_sel=%02x, saddr=%08x, daddr=%08x\n",
384 __func__, self->slsap_sel, dlsap_sel, saddr, daddr);
385
386 if (test_bit(0, &self->connected)) {
387 ret = -EISCONN;
388 goto err;
389 }
390
391 /* Client must supply destination device address */
392 if (!daddr) {
393 ret = -EINVAL;
394 goto err;
395 }
396
397 /* Any userdata? */
398 if (tx_skb == NULL) {
399 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
400 if (!tx_skb)
401 return -ENOMEM;
402
403 skb_reserve(tx_skb, LMP_MAX_HEADER);
404 }
405
406 /* Make room for MUX control header (3 bytes) */
407 IRDA_ASSERT(skb_headroom(tx_skb) >= LMP_CONTROL_HEADER, return -1;);
408 skb_push(tx_skb, LMP_CONTROL_HEADER);
409
410 self->dlsap_sel = dlsap_sel;
411
412 /*
413 * Find the link to where we should try to connect since there may
414 * be more than one IrDA port on this machine. If the client has
415 * passed us the saddr (and already knows which link to use), then
416 * we use that to find the link, if not then we have to look in the
417 * discovery log and check if any of the links has discovered a
418 * device with the given daddr
419 */
420 if ((!saddr) || (saddr == DEV_ADDR_ANY)) {
421 discovery_t *discovery;
422 unsigned long flags;
423
424 spin_lock_irqsave(&irlmp->cachelog->hb_spinlock, flags);
425 if (daddr != DEV_ADDR_ANY)
426 discovery = hashbin_find(irlmp->cachelog, daddr, NULL);
427 else {
428 IRDA_DEBUG(2, "%s(), no daddr\n", __func__);
429 discovery = (discovery_t *)
430 hashbin_get_first(irlmp->cachelog);
431 }
432
433 if (discovery) {
434 saddr = discovery->data.saddr;
435 daddr = discovery->data.daddr;
436 }
437 spin_unlock_irqrestore(&irlmp->cachelog->hb_spinlock, flags);
438 }
439 lap = hashbin_lock_find(irlmp->links, saddr, NULL);
440 if (lap == NULL) {
441 IRDA_DEBUG(1, "%s(), Unable to find a usable link!\n", __func__);
442 ret = -EHOSTUNREACH;
443 goto err;
444 }
445
446 /* Check if LAP is disconnected or already connected */
447 if (lap->daddr == DEV_ADDR_ANY)
448 lap->daddr = daddr;
449 else if (lap->daddr != daddr) {
450 /* Check if some LSAPs are active on this LAP */
451 if (HASHBIN_GET_SIZE(lap->lsaps) == 0) {
452 /* No active connection, but LAP hasn't been
453 * disconnected yet (waiting for timeout in LAP).
454 * Maybe we could give LAP a bit of help in this case.
455 */
456 IRDA_DEBUG(0, "%s(), sorry, but I'm waiting for LAP to timeout!\n", __func__);
457 ret = -EAGAIN;
458 goto err;
459 }
460
461 /* LAP is already connected to a different node, and LAP
462 * can only talk to one node at a time */
463 IRDA_DEBUG(0, "%s(), sorry, but link is busy!\n", __func__);
464 ret = -EBUSY;
465 goto err;
466 }
467
468 self->lap = lap;
469
470 /*
471 * Remove LSAP from list of unconnected LSAPs and insert it into the
472 * list of connected LSAPs for the particular link
473 */
474 lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self, NULL);
475
476 IRDA_ASSERT(lsap != NULL, return -1;);
477 IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
478 IRDA_ASSERT(lsap->lap != NULL, return -1;);
479 IRDA_ASSERT(lsap->lap->magic == LMP_LAP_MAGIC, return -1;);
480
481 hashbin_insert(self->lap->lsaps, (irda_queue_t *) self, (long) self,
482 NULL);
483
484 set_bit(0, &self->connected); /* TRUE */
485
486 /*
487 * User supplied qos specifications?
488 */
489 if (qos)
490 self->qos = *qos;
491
492 irlmp_do_lsap_event(self, LM_CONNECT_REQUEST, tx_skb);
493
494 /* Drop reference count - see irlap_data_request(). */
495 dev_kfree_skb(tx_skb);
496
497 return 0;
498
499err:
500 /* Cleanup */
501 if(tx_skb)
502 dev_kfree_skb(tx_skb);
503 return ret;
504}
505EXPORT_SYMBOL(irlmp_connect_request);
506
507/*
508 * Function irlmp_connect_indication (self)
509 *
510 * Incoming connection
511 *
512 */
513void irlmp_connect_indication(struct lsap_cb *self, struct sk_buff *skb)
514{
515 int max_seg_size;
516 int lap_header_size;
517 int max_header_size;
518
519 IRDA_ASSERT(self != NULL, return;);
520 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
521 IRDA_ASSERT(skb != NULL, return;);
522 IRDA_ASSERT(self->lap != NULL, return;);
523
524 IRDA_DEBUG(2, "%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
525 __func__, self->slsap_sel, self->dlsap_sel);
526
527 /* Note : self->lap is set in irlmp_link_data_indication(),
528 * (case CONNECT_CMD:) because we have no way to set it here.
529 * Similarly, self->dlsap_sel is usually set in irlmp_find_lsap().
530 * Jean II */
531
532 self->qos = *self->lap->qos;
533
534 max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
535 lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
536 max_header_size = LMP_HEADER + lap_header_size;
537
538 /* Hide LMP_CONTROL_HEADER header from layer above */
539 skb_pull(skb, LMP_CONTROL_HEADER);
540
541 if (self->notify.connect_indication) {
542 /* Don't forget to refcount it - see irlap_driver_rcv(). */
543 skb_get(skb);
544 self->notify.connect_indication(self->notify.instance, self,
545 &self->qos, max_seg_size,
546 max_header_size, skb);
547 }
548}
549
550/*
551 * Function irlmp_connect_response (handle, userdata)
552 *
553 * Service user is accepting connection
554 *
555 */
556int irlmp_connect_response(struct lsap_cb *self, struct sk_buff *userdata)
557{
558 IRDA_ASSERT(self != NULL, return -1;);
559 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
560 IRDA_ASSERT(userdata != NULL, return -1;);
561
562 /* We set the connected bit and move the lsap to the connected list
563 * in the state machine itself. Jean II */
564
565 IRDA_DEBUG(2, "%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
566 __func__, self->slsap_sel, self->dlsap_sel);
567
568 /* Make room for MUX control header (3 bytes) */
569 IRDA_ASSERT(skb_headroom(userdata) >= LMP_CONTROL_HEADER, return -1;);
570 skb_push(userdata, LMP_CONTROL_HEADER);
571
572 irlmp_do_lsap_event(self, LM_CONNECT_RESPONSE, userdata);
573
574 /* Drop reference count - see irlap_data_request(). */
575 dev_kfree_skb(userdata);
576
577 return 0;
578}
579EXPORT_SYMBOL(irlmp_connect_response);
580
581/*
582 * Function irlmp_connect_confirm (handle, skb)
583 *
584 * LSAP connection confirmed peer device!
585 */
586void irlmp_connect_confirm(struct lsap_cb *self, struct sk_buff *skb)
587{
588 int max_header_size;
589 int lap_header_size;
590 int max_seg_size;
591
592 IRDA_DEBUG(3, "%s()\n", __func__);
593
594 IRDA_ASSERT(skb != NULL, return;);
595 IRDA_ASSERT(self != NULL, return;);
596 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
597 IRDA_ASSERT(self->lap != NULL, return;);
598
599 self->qos = *self->lap->qos;
600
601 max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
602 lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
603 max_header_size = LMP_HEADER + lap_header_size;
604
605 IRDA_DEBUG(2, "%s(), max_header_size=%d\n",
606 __func__, max_header_size);
607
608 /* Hide LMP_CONTROL_HEADER header from layer above */
609 skb_pull(skb, LMP_CONTROL_HEADER);
610
611 if (self->notify.connect_confirm) {
612 /* Don't forget to refcount it - see irlap_driver_rcv() */
613 skb_get(skb);
614 self->notify.connect_confirm(self->notify.instance, self,
615 &self->qos, max_seg_size,
616 max_header_size, skb);
617 }
618}
619
620/*
621 * Function irlmp_dup (orig, instance)
622 *
623 * Duplicate LSAP, can be used by servers to confirm a connection on a
624 * new LSAP so it can keep listening on the old one.
625 *
626 */
627struct lsap_cb *irlmp_dup(struct lsap_cb *orig, void *instance)
628{
629 struct lsap_cb *new;
630 unsigned long flags;
631
632 IRDA_DEBUG(1, "%s()\n", __func__);
633
634 spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);
635
636 /* Only allowed to duplicate unconnected LSAP's, and only LSAPs
637 * that have received a connect indication. Jean II */
638 if ((!hashbin_find(irlmp->unconnected_lsaps, (long) orig, NULL)) ||
639 (orig->lap == NULL)) {
640 IRDA_DEBUG(0, "%s(), invalid LSAP (wrong state)\n",
641 __func__);
642 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
643 flags);
644 return NULL;
645 }
646
647 /* Allocate a new instance */
648 new = kmemdup(orig, sizeof(*new), GFP_ATOMIC);
649 if (!new) {
650 IRDA_DEBUG(0, "%s(), unable to kmalloc\n", __func__);
651 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
652 flags);
653 return NULL;
654 }
655 /* new->lap = orig->lap; => done in the memcpy() */
656 /* new->slsap_sel = orig->slsap_sel; => done in the memcpy() */
657 new->conn_skb = NULL;
658
659 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
660
661 /* Not everything is the same */
662 new->notify.instance = instance;
663
664 init_timer(&new->watchdog_timer);
665
666 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) new,
667 (long) new, NULL);
668
669#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
670 /* Make sure that we invalidate the LSAP cache */
671 new->lap->cache.valid = FALSE;
672#endif /* CONFIG_IRDA_CACHE_LAST_LSAP */
673
674 return new;
675}
676
677/*
678 * Function irlmp_disconnect_request (handle, userdata)
679 *
680 * The service user is requesting disconnection, this will not remove the
681 * LSAP, but only mark it as disconnected
682 */
683int irlmp_disconnect_request(struct lsap_cb *self, struct sk_buff *userdata)
684{
685 struct lsap_cb *lsap;
686
687 IRDA_ASSERT(self != NULL, return -1;);
688 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
689 IRDA_ASSERT(userdata != NULL, return -1;);
690
691 /* Already disconnected ?
692 * There is a race condition between irlmp_disconnect_indication()
693 * and us that might mess up the hashbins below. This fixes it.
694 * Jean II */
695 if (! test_and_clear_bit(0, &self->connected)) {
696 IRDA_DEBUG(0, "%s(), already disconnected!\n", __func__);
697 dev_kfree_skb(userdata);
698 return -1;
699 }
700
701 skb_push(userdata, LMP_CONTROL_HEADER);
702
703 /*
704 * Do the event before the other stuff since we must know
705 * which lap layer that the frame should be transmitted on
706 */
707 irlmp_do_lsap_event(self, LM_DISCONNECT_REQUEST, userdata);
708
709 /* Drop reference count - see irlap_data_request(). */
710 dev_kfree_skb(userdata);
711
712 /*
713 * Remove LSAP from list of connected LSAPs for the particular link
714 * and insert it into the list of unconnected LSAPs
715 */
716 IRDA_ASSERT(self->lap != NULL, return -1;);
717 IRDA_ASSERT(self->lap->magic == LMP_LAP_MAGIC, return -1;);
718 IRDA_ASSERT(self->lap->lsaps != NULL, return -1;);
719
720 lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
721#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
722 self->lap->cache.valid = FALSE;
723#endif
724
725 IRDA_ASSERT(lsap != NULL, return -1;);
726 IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
727 IRDA_ASSERT(lsap == self, return -1;);
728
729 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
730 (long) self, NULL);
731
732 /* Reset some values */
733 self->dlsap_sel = LSAP_ANY;
734 self->lap = NULL;
735
736 return 0;
737}
738EXPORT_SYMBOL(irlmp_disconnect_request);
739
740/*
741 * Function irlmp_disconnect_indication (reason, userdata)
742 *
743 * LSAP is being closed!
744 */
745void irlmp_disconnect_indication(struct lsap_cb *self, LM_REASON reason,
746 struct sk_buff *skb)
747{
748 struct lsap_cb *lsap;
749
750 IRDA_DEBUG(1, "%s(), reason=%s\n", __func__, irlmp_reasons[reason]);
751 IRDA_ASSERT(self != NULL, return;);
752 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
753
754 IRDA_DEBUG(3, "%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
755 __func__, self->slsap_sel, self->dlsap_sel);
756
757 /* Already disconnected ?
758 * There is a race condition between irlmp_disconnect_request()
759 * and us that might mess up the hashbins below. This fixes it.
760 * Jean II */
761 if (! test_and_clear_bit(0, &self->connected)) {
762 IRDA_DEBUG(0, "%s(), already disconnected!\n", __func__);
763 return;
764 }
765
766 /*
767 * Remove association between this LSAP and the link it used
768 */
769 IRDA_ASSERT(self->lap != NULL, return;);
770 IRDA_ASSERT(self->lap->lsaps != NULL, return;);
771
772 lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
773#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
774 self->lap->cache.valid = FALSE;
775#endif
776
777 IRDA_ASSERT(lsap != NULL, return;);
778 IRDA_ASSERT(lsap == self, return;);
779 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) lsap,
780 (long) lsap, NULL);
781
782 self->dlsap_sel = LSAP_ANY;
783 self->lap = NULL;
784
785 /*
786 * Inform service user
787 */
788 if (self->notify.disconnect_indication) {
789 /* Don't forget to refcount it - see irlap_driver_rcv(). */
790 if(skb)
791 skb_get(skb);
792 self->notify.disconnect_indication(self->notify.instance,
793 self, reason, skb);
794 } else {
795 IRDA_DEBUG(0, "%s(), no handler\n", __func__);
796 }
797}
798
799/*
800 * Function irlmp_do_expiry (void)
801 *
802 * Do a cleanup of the discovery log (remove old entries)
803 *
804 * Note : separate from irlmp_do_discovery() so that we can handle
805 * passive discovery properly.
806 */
807void irlmp_do_expiry(void)
808{
809 struct lap_cb *lap;
810
811 /*
812 * Expire discovery on all links which are *not* connected.
813 * On links which are connected, we can't do discovery
814 * anymore and can't refresh the log, so we freeze the
815 * discovery log to keep info about the device we are
816 * connected to.
817 * This info is mandatory if we want irlmp_connect_request()
818 * to work properly. - Jean II
819 */
820 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
821 while (lap != NULL) {
822 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
823
824 if (lap->lap_state == LAP_STANDBY) {
825 /* Expire discoveries discovered on this link */
826 irlmp_expire_discoveries(irlmp->cachelog, lap->saddr,
827 FALSE);
828 }
829 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
830 }
831}
832
833/*
834 * Function irlmp_do_discovery (nslots)
835 *
836 * Do some discovery on all links
837 *
838 * Note : log expiry is done above.
839 */
840void irlmp_do_discovery(int nslots)
841{
842 struct lap_cb *lap;
843 __u16 *data_hintsp;
844
845 /* Make sure the value is sane */
846 if ((nslots != 1) && (nslots != 6) && (nslots != 8) && (nslots != 16)){
847 IRDA_WARNING("%s: invalid value for number of slots!\n",
848 __func__);
849 nslots = sysctl_discovery_slots = 8;
850 }
851
852 /* Construct new discovery info to be used by IrLAP, */
853 data_hintsp = (__u16 *) irlmp->discovery_cmd.data.hints;
854 put_unaligned(irlmp->hints.word, data_hintsp);
855
856 /*
857 * Set character set for device name (we use ASCII), and
858 * copy device name. Remember to make room for a \0 at the
859 * end
860 */
861 irlmp->discovery_cmd.data.charset = CS_ASCII;
862 strncpy(irlmp->discovery_cmd.data.info, sysctl_devname,
863 NICKNAME_MAX_LEN);
864 irlmp->discovery_cmd.name_len = strlen(irlmp->discovery_cmd.data.info);
865 irlmp->discovery_cmd.nslots = nslots;
866
867 /*
868 * Try to send discovery packets on all links
869 */
870 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
871 while (lap != NULL) {
872 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
873
874 if (lap->lap_state == LAP_STANDBY) {
875 /* Try to discover */
876 irlmp_do_lap_event(lap, LM_LAP_DISCOVERY_REQUEST,
877 NULL);
878 }
879 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
880 }
881}
882
883/*
884 * Function irlmp_discovery_request (nslots)
885 *
886 * Do a discovery of devices in front of the computer
887 *
888 * If the caller has registered a client discovery callback, this
889 * allow him to receive the full content of the discovery log through
890 * this callback (as normally he will receive only new discoveries).
891 */
892void irlmp_discovery_request(int nslots)
893{
894 /* Return current cached discovery log (in full) */
895 irlmp_discovery_confirm(irlmp->cachelog, DISCOVERY_LOG);
896
897 /*
898 * Start a single discovery operation if discovery is not already
899 * running
900 */
901 if (!sysctl_discovery) {
902 /* Check if user wants to override the default */
903 if (nslots == DISCOVERY_DEFAULT_SLOTS)
904 nslots = sysctl_discovery_slots;
905
906 irlmp_do_discovery(nslots);
907 /* Note : we never do expiry here. Expiry will run on the
908 * discovery timer regardless of the state of sysctl_discovery
909 * Jean II */
910 }
911}
912EXPORT_SYMBOL(irlmp_discovery_request);
913
914/*
915 * Function irlmp_get_discoveries (pn, mask, slots)
916 *
917 * Return the current discovery log
918 *
919 * If discovery is not enabled, you should call this function again
920 * after 1 or 2 seconds (i.e. after discovery has been done).
921 */
922struct irda_device_info *irlmp_get_discoveries(int *pn, __u16 mask, int nslots)
923{
924 /* If discovery is not enabled, it's likely that the discovery log
925 * will be empty. So, we trigger a single discovery, so that next
926 * time the user call us there might be some results in the log.
927 * Jean II
928 */
929 if (!sysctl_discovery) {
930 /* Check if user wants to override the default */
931 if (nslots == DISCOVERY_DEFAULT_SLOTS)
932 nslots = sysctl_discovery_slots;
933
934 /* Start discovery - will complete sometime later */
935 irlmp_do_discovery(nslots);
936 /* Note : we never do expiry here. Expiry will run on the
937 * discovery timer regardless of the state of sysctl_discovery
938 * Jean II */
939 }
940
941 /* Return current cached discovery log */
942 return irlmp_copy_discoveries(irlmp->cachelog, pn, mask, TRUE);
943}
944EXPORT_SYMBOL(irlmp_get_discoveries);
945
946/*
947 * Function irlmp_notify_client (log)
948 *
949 * Notify all about discovered devices
950 *
951 * Clients registered with IrLMP are :
952 * o IrComm
953 * o IrLAN
954 * o Any socket (in any state - ouch, that may be a lot !)
955 * The client may have defined a callback to be notified in case of
956 * partial/selective discovery based on the hints that it passed to IrLMP.
957 */
958static inline void
959irlmp_notify_client(irlmp_client_t *client,
960 hashbin_t *log, DISCOVERY_MODE mode)
961{
962 discinfo_t *discoveries; /* Copy of the discovery log */
963 int number; /* Number of nodes in the log */
964 int i;
965
966 IRDA_DEBUG(3, "%s()\n", __func__);
967
968 /* Check if client wants or not partial/selective log (optimisation) */
969 if (!client->disco_callback)
970 return;
971
972 /*
973 * Locking notes :
974 * the old code was manipulating the log directly, which was
975 * very racy. Now, we use copy_discoveries, that protects
976 * itself while dumping the log for us.
977 * The overhead of the copy is compensated by the fact that
978 * we only pass new discoveries in normal mode and don't
979 * pass the same old entry every 3s to the caller as we used
980 * to do (virtual function calling is expensive).
981 * Jean II
982 */
983
984 /*
985 * Now, check all discovered devices (if any), and notify client
986 * only about the services that the client is interested in
987 * We also notify only about the new devices unless the caller
988 * explicitly request a dump of the log. Jean II
989 */
990 discoveries = irlmp_copy_discoveries(log, &number,
991 client->hint_mask.word,
992 (mode == DISCOVERY_LOG));
993 /* Check if the we got some results */
994 if (discoveries == NULL)
995 return; /* No nodes discovered */
996
997 /* Pass all entries to the listener */
998 for(i = 0; i < number; i++)
999 client->disco_callback(&(discoveries[i]), mode, client->priv);
1000
1001 /* Free up our buffer */
1002 kfree(discoveries);
1003}
1004
1005/*
1006 * Function irlmp_discovery_confirm ( self, log)
1007 *
1008 * Some device(s) answered to our discovery request! Check to see which
1009 * device it is, and give indication to the client(s)
1010 *
1011 */
1012void irlmp_discovery_confirm(hashbin_t *log, DISCOVERY_MODE mode)
1013{
1014 irlmp_client_t *client;
1015 irlmp_client_t *client_next;
1016
1017 IRDA_DEBUG(3, "%s()\n", __func__);
1018
1019 IRDA_ASSERT(log != NULL, return;);
1020
1021 if (!(HASHBIN_GET_SIZE(log)))
1022 return;
1023
1024 /* For each client - notify callback may touch client list */
1025 client = (irlmp_client_t *) hashbin_get_first(irlmp->clients);
1026 while (NULL != hashbin_find_next(irlmp->clients, (long) client, NULL,
1027 (void *) &client_next) ) {
1028 /* Check if we should notify client */
1029 irlmp_notify_client(client, log, mode);
1030
1031 client = client_next;
1032 }
1033}
1034
1035/*
1036 * Function irlmp_discovery_expiry (expiry)
1037 *
1038 * This device is no longer been discovered, and therefore it is being
1039 * purged from the discovery log. Inform all clients who have
1040 * registered for this event...
1041 *
1042 * Note : called exclusively from discovery.c
1043 * Note : this is no longer called under discovery spinlock, so the
1044 * client can do whatever he wants in the callback.
1045 */
1046void irlmp_discovery_expiry(discinfo_t *expiries, int number)
1047{
1048 irlmp_client_t *client;
1049 irlmp_client_t *client_next;
1050 int i;
1051
1052 IRDA_DEBUG(3, "%s()\n", __func__);
1053
1054 IRDA_ASSERT(expiries != NULL, return;);
1055
1056 /* For each client - notify callback may touch client list */
1057 client = (irlmp_client_t *) hashbin_get_first(irlmp->clients);
1058 while (NULL != hashbin_find_next(irlmp->clients, (long) client, NULL,
1059 (void *) &client_next) ) {
1060
1061 /* Pass all entries to the listener */
1062 for(i = 0; i < number; i++) {
1063 /* Check if we should notify client */
1064 if ((client->expir_callback) &&
1065 (client->hint_mask.word &
1066 get_unaligned((__u16 *)expiries[i].hints)
1067 & 0x7f7f) )
1068 client->expir_callback(&(expiries[i]),
1069 EXPIRY_TIMEOUT,
1070 client->priv);
1071 }
1072
1073 /* Next client */
1074 client = client_next;
1075 }
1076}
1077
1078/*
1079 * Function irlmp_get_discovery_response ()
1080 *
1081 * Used by IrLAP to get the discovery info it needs when answering
1082 * discovery requests by other devices.
1083 */
1084discovery_t *irlmp_get_discovery_response(void)
1085{
1086 IRDA_DEBUG(4, "%s()\n", __func__);
1087
1088 IRDA_ASSERT(irlmp != NULL, return NULL;);
1089
1090 put_unaligned(irlmp->hints.word, (__u16 *)irlmp->discovery_rsp.data.hints);
1091
1092 /*
1093 * Set character set for device name (we use ASCII), and
1094 * copy device name. Remember to make room for a \0 at the
1095 * end
1096 */
1097 irlmp->discovery_rsp.data.charset = CS_ASCII;
1098
1099 strncpy(irlmp->discovery_rsp.data.info, sysctl_devname,
1100 NICKNAME_MAX_LEN);
1101 irlmp->discovery_rsp.name_len = strlen(irlmp->discovery_rsp.data.info);
1102
1103 return &irlmp->discovery_rsp;
1104}
1105
1106/*
1107 * Function irlmp_data_request (self, skb)
1108 *
1109 * Send some data to peer device
1110 *
1111 * Note on skb management :
1112 * After calling the lower layers of the IrDA stack, we always
1113 * kfree() the skb, which drop the reference count (and potentially
1114 * destroy it).
1115 * IrLMP and IrLAP may queue the packet, and in those cases will need
1116 * to use skb_get() to keep it around.
1117 * Jean II
1118 */
1119int irlmp_data_request(struct lsap_cb *self, struct sk_buff *userdata)
1120{
1121 int ret;
1122
1123 IRDA_ASSERT(self != NULL, return -1;);
1124 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
1125
1126 /* Make room for MUX header */
1127 IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER, return -1;);
1128 skb_push(userdata, LMP_HEADER);
1129
1130 ret = irlmp_do_lsap_event(self, LM_DATA_REQUEST, userdata);
1131
1132 /* Drop reference count - see irlap_data_request(). */
1133 dev_kfree_skb(userdata);
1134
1135 return ret;
1136}
1137EXPORT_SYMBOL(irlmp_data_request);
1138
1139/*
1140 * Function irlmp_data_indication (handle, skb)
1141 *
1142 * Got data from LAP layer so pass it up to upper layer
1143 *
1144 */
1145void irlmp_data_indication(struct lsap_cb *self, struct sk_buff *skb)
1146{
1147 /* Hide LMP header from layer above */
1148 skb_pull(skb, LMP_HEADER);
1149
1150 if (self->notify.data_indication) {
1151 /* Don't forget to refcount it - see irlap_driver_rcv(). */
1152 skb_get(skb);
1153 self->notify.data_indication(self->notify.instance, self, skb);
1154 }
1155}
1156
1157/*
1158 * Function irlmp_udata_request (self, skb)
1159 */
1160int irlmp_udata_request(struct lsap_cb *self, struct sk_buff *userdata)
1161{
1162 int ret;
1163
1164 IRDA_DEBUG(4, "%s()\n", __func__);
1165
1166 IRDA_ASSERT(userdata != NULL, return -1;);
1167
1168 /* Make room for MUX header */
1169 IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER, return -1;);
1170 skb_push(userdata, LMP_HEADER);
1171
1172 ret = irlmp_do_lsap_event(self, LM_UDATA_REQUEST, userdata);
1173
1174 /* Drop reference count - see irlap_data_request(). */
1175 dev_kfree_skb(userdata);
1176
1177 return ret;
1178}
1179
1180/*
1181 * Function irlmp_udata_indication (self, skb)
1182 *
1183 * Send unreliable data (but still within the connection)
1184 *
1185 */
1186void irlmp_udata_indication(struct lsap_cb *self, struct sk_buff *skb)
1187{
1188 IRDA_DEBUG(4, "%s()\n", __func__);
1189
1190 IRDA_ASSERT(self != NULL, return;);
1191 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
1192 IRDA_ASSERT(skb != NULL, return;);
1193
1194 /* Hide LMP header from layer above */
1195 skb_pull(skb, LMP_HEADER);
1196
1197 if (self->notify.udata_indication) {
1198 /* Don't forget to refcount it - see irlap_driver_rcv(). */
1199 skb_get(skb);
1200 self->notify.udata_indication(self->notify.instance, self,
1201 skb);
1202 }
1203}
1204
1205/*
1206 * Function irlmp_connless_data_request (self, skb)
1207 */
1208#ifdef CONFIG_IRDA_ULTRA
1209int irlmp_connless_data_request(struct lsap_cb *self, struct sk_buff *userdata,
1210 __u8 pid)
1211{
1212 struct sk_buff *clone_skb;
1213 struct lap_cb *lap;
1214
1215 IRDA_DEBUG(4, "%s()\n", __func__);
1216
1217 IRDA_ASSERT(userdata != NULL, return -1;);
1218
1219 /* Make room for MUX and PID header */
1220 IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER+LMP_PID_HEADER,
1221 return -1;);
1222
1223 /* Insert protocol identifier */
1224 skb_push(userdata, LMP_PID_HEADER);
1225 if(self != NULL)
1226 userdata->data[0] = self->pid;
1227 else
1228 userdata->data[0] = pid;
1229
1230 /* Connectionless sockets must use 0x70 */
1231 skb_push(userdata, LMP_HEADER);
1232 userdata->data[0] = userdata->data[1] = LSAP_CONNLESS;
1233
1234 /* Try to send Connectionless packets out on all links */
1235 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
1236 while (lap != NULL) {
1237 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return -1;);
1238
1239 clone_skb = skb_clone(userdata, GFP_ATOMIC);
1240 if (!clone_skb) {
1241 dev_kfree_skb(userdata);
1242 return -ENOMEM;
1243 }
1244
1245 irlap_unitdata_request(lap->irlap, clone_skb);
1246 /* irlap_unitdata_request() don't increase refcount,
1247 * so no dev_kfree_skb() - Jean II */
1248
1249 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
1250 }
1251 dev_kfree_skb(userdata);
1252
1253 return 0;
1254}
1255#endif /* CONFIG_IRDA_ULTRA */
1256
1257/*
1258 * Function irlmp_connless_data_indication (self, skb)
1259 *
1260 * Receive unreliable data outside any connection. Mostly used by Ultra
1261 *
1262 */
1263#ifdef CONFIG_IRDA_ULTRA
1264void irlmp_connless_data_indication(struct lsap_cb *self, struct sk_buff *skb)
1265{
1266 IRDA_DEBUG(4, "%s()\n", __func__);
1267
1268 IRDA_ASSERT(self != NULL, return;);
1269 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
1270 IRDA_ASSERT(skb != NULL, return;);
1271
1272 /* Hide LMP and PID header from layer above */
1273 skb_pull(skb, LMP_HEADER+LMP_PID_HEADER);
1274
1275 if (self->notify.udata_indication) {
1276 /* Don't forget to refcount it - see irlap_driver_rcv(). */
1277 skb_get(skb);
1278 self->notify.udata_indication(self->notify.instance, self,
1279 skb);
1280 }
1281}
1282#endif /* CONFIG_IRDA_ULTRA */
1283
1284/*
1285 * Propagate status indication from LAP to LSAPs (via LMP)
1286 * This don't trigger any change of state in lap_cb, lmp_cb or lsap_cb,
1287 * and the event is stateless, therefore we can bypass both state machines
1288 * and send the event direct to the LSAP user.
1289 * Jean II
1290 */
1291void irlmp_status_indication(struct lap_cb *self,
1292 LINK_STATUS link, LOCK_STATUS lock)
1293{
1294 struct lsap_cb *next;
1295 struct lsap_cb *curr;
1296
1297 /* Send status_indication to all LSAPs using this link */
1298 curr = (struct lsap_cb *) hashbin_get_first( self->lsaps);
1299 while (NULL != hashbin_find_next(self->lsaps, (long) curr, NULL,
1300 (void *) &next) ) {
1301 IRDA_ASSERT(curr->magic == LMP_LSAP_MAGIC, return;);
1302 /*
1303 * Inform service user if he has requested it
1304 */
1305 if (curr->notify.status_indication != NULL)
1306 curr->notify.status_indication(curr->notify.instance,
1307 link, lock);
1308 else
1309 IRDA_DEBUG(2, "%s(), no handler\n", __func__);
1310
1311 curr = next;
1312 }
1313}
1314
1315/*
1316 * Receive flow control indication from LAP.
1317 * LAP want us to send it one more frame. We implement a simple round
1318 * robin scheduler between the active sockets so that we get a bit of
1319 * fairness. Note that the round robin is far from perfect, but it's
1320 * better than nothing.
1321 * We then poll the selected socket so that we can do synchronous
1322 * refilling of IrLAP (which allow to minimise the number of buffers).
1323 * Jean II
1324 */
1325void irlmp_flow_indication(struct lap_cb *self, LOCAL_FLOW flow)
1326{
1327 struct lsap_cb *next;
1328 struct lsap_cb *curr;
1329 int lsap_todo;
1330
1331 IRDA_ASSERT(self->magic == LMP_LAP_MAGIC, return;);
1332 IRDA_ASSERT(flow == FLOW_START, return;);
1333
1334 /* Get the number of lsap. That's the only safe way to know
1335 * that we have looped around... - Jean II */
1336 lsap_todo = HASHBIN_GET_SIZE(self->lsaps);
1337 IRDA_DEBUG(4, "%s() : %d lsaps to scan\n", __func__, lsap_todo);
1338
1339 /* Poll lsap in order until the queue is full or until we
1340 * tried them all.
1341 * Most often, the current LSAP will have something to send,
1342 * so we will go through this loop only once. - Jean II */
1343 while((lsap_todo--) &&
1344 (IRLAP_GET_TX_QUEUE_LEN(self->irlap) < LAP_HIGH_THRESHOLD)) {
1345 /* Try to find the next lsap we should poll. */
1346 next = self->flow_next;
1347 /* If we have no lsap, restart from first one */
1348 if(next == NULL)
1349 next = (struct lsap_cb *) hashbin_get_first(self->lsaps);
1350 /* Verify current one and find the next one */
1351 curr = hashbin_find_next(self->lsaps, (long) next, NULL,
1352 (void *) &self->flow_next);
1353 /* Uh-oh... Paranoia */
1354 if(curr == NULL)
1355 break;
1356 IRDA_DEBUG(4, "%s() : curr is %p, next was %p and is now %p, still %d to go - queue len = %d\n", __func__, curr, next, self->flow_next, lsap_todo, IRLAP_GET_TX_QUEUE_LEN(self->irlap));
1357
1358 /* Inform lsap user that it can send one more packet. */
1359 if (curr->notify.flow_indication != NULL)
1360 curr->notify.flow_indication(curr->notify.instance,
1361 curr, flow);
1362 else
1363 IRDA_DEBUG(1, "%s(), no handler\n", __func__);
1364 }
1365}
1366
1367#if 0
1368/*
1369 * Function irlmp_hint_to_service (hint)
1370 *
1371 * Returns a list of all servics contained in the given hint bits. This
1372 * function assumes that the hint bits have the size of two bytes only
1373 */
1374__u8 *irlmp_hint_to_service(__u8 *hint)
1375{
1376 __u8 *service;
1377 int i = 0;
1378
1379 /*
1380 * Allocate array to store services in. 16 entries should be safe
1381 * since we currently only support 2 hint bytes
1382 */
1383 service = kmalloc(16, GFP_ATOMIC);
1384 if (!service) {
1385 IRDA_DEBUG(1, "%s(), Unable to kmalloc!\n", __func__);
1386 return NULL;
1387 }
1388
1389 if (!hint[0]) {
1390 IRDA_DEBUG(1, "<None>\n");
1391 kfree(service);
1392 return NULL;
1393 }
1394 if (hint[0] & HINT_PNP)
1395 IRDA_DEBUG(1, "PnP Compatible ");
1396 if (hint[0] & HINT_PDA)
1397 IRDA_DEBUG(1, "PDA/Palmtop ");
1398 if (hint[0] & HINT_COMPUTER)
1399 IRDA_DEBUG(1, "Computer ");
1400 if (hint[0] & HINT_PRINTER) {
1401 IRDA_DEBUG(1, "Printer ");
1402 service[i++] = S_PRINTER;
1403 }
1404 if (hint[0] & HINT_MODEM)
1405 IRDA_DEBUG(1, "Modem ");
1406 if (hint[0] & HINT_FAX)
1407 IRDA_DEBUG(1, "Fax ");
1408 if (hint[0] & HINT_LAN) {
1409 IRDA_DEBUG(1, "LAN Access ");
1410 service[i++] = S_LAN;
1411 }
1412 /*
1413 * Test if extension byte exists. This byte will usually be
1414 * there, but this is not really required by the standard.
1415 * (IrLMP p. 29)
1416 */
1417 if (hint[0] & HINT_EXTENSION) {
1418 if (hint[1] & HINT_TELEPHONY) {
1419 IRDA_DEBUG(1, "Telephony ");
1420 service[i++] = S_TELEPHONY;
1421 } if (hint[1] & HINT_FILE_SERVER)
1422 IRDA_DEBUG(1, "File Server ");
1423
1424 if (hint[1] & HINT_COMM) {
1425 IRDA_DEBUG(1, "IrCOMM ");
1426 service[i++] = S_COMM;
1427 }
1428 if (hint[1] & HINT_OBEX) {
1429 IRDA_DEBUG(1, "IrOBEX ");
1430 service[i++] = S_OBEX;
1431 }
1432 }
1433 IRDA_DEBUG(1, "\n");
1434
1435 /* So that client can be notified about any discovery */
1436 service[i++] = S_ANY;
1437
1438 service[i] = S_END;
1439
1440 return service;
1441}
1442#endif
1443
1444static const __u16 service_hint_mapping[S_END][2] = {
1445 { HINT_PNP, 0 }, /* S_PNP */
1446 { HINT_PDA, 0 }, /* S_PDA */
1447 { HINT_COMPUTER, 0 }, /* S_COMPUTER */
1448 { HINT_PRINTER, 0 }, /* S_PRINTER */
1449 { HINT_MODEM, 0 }, /* S_MODEM */
1450 { HINT_FAX, 0 }, /* S_FAX */
1451 { HINT_LAN, 0 }, /* S_LAN */
1452 { HINT_EXTENSION, HINT_TELEPHONY }, /* S_TELEPHONY */
1453 { HINT_EXTENSION, HINT_COMM }, /* S_COMM */
1454 { HINT_EXTENSION, HINT_OBEX }, /* S_OBEX */
1455 { 0xFF, 0xFF }, /* S_ANY */
1456};
1457
1458/*
1459 * Function irlmp_service_to_hint (service)
1460 *
1461 * Converts a service type, to a hint bit
1462 *
1463 * Returns: a 16 bit hint value, with the service bit set
1464 */
1465__u16 irlmp_service_to_hint(int service)
1466{
1467 __u16_host_order hint;
1468
1469 hint.byte[0] = service_hint_mapping[service][0];
1470 hint.byte[1] = service_hint_mapping[service][1];
1471
1472 return hint.word;
1473}
1474EXPORT_SYMBOL(irlmp_service_to_hint);
1475
1476/*
1477 * Function irlmp_register_service (service)
1478 *
1479 * Register local service with IrLMP
1480 *
1481 */
1482void *irlmp_register_service(__u16 hints)
1483{
1484 irlmp_service_t *service;
1485
1486 IRDA_DEBUG(4, "%s(), hints = %04x\n", __func__, hints);
1487
1488 /* Make a new registration */
1489 service = kmalloc(sizeof(irlmp_service_t), GFP_ATOMIC);
1490 if (!service) {
1491 IRDA_DEBUG(1, "%s(), Unable to kmalloc!\n", __func__);
1492 return NULL;
1493 }
1494 service->hints.word = hints;
1495 hashbin_insert(irlmp->services, (irda_queue_t *) service,
1496 (long) service, NULL);
1497
1498 irlmp->hints.word |= hints;
1499
1500 return (void *)service;
1501}
1502EXPORT_SYMBOL(irlmp_register_service);
1503
1504/*
1505 * Function irlmp_unregister_service (handle)
1506 *
1507 * Unregister service with IrLMP.
1508 *
1509 * Returns: 0 on success, -1 on error
1510 */
1511int irlmp_unregister_service(void *handle)
1512{
1513 irlmp_service_t *service;
1514 unsigned long flags;
1515
1516 IRDA_DEBUG(4, "%s()\n", __func__);
1517
1518 if (!handle)
1519 return -1;
1520
1521 /* Caller may call with invalid handle (it's legal) - Jean II */
1522 service = hashbin_lock_find(irlmp->services, (long) handle, NULL);
1523 if (!service) {
1524 IRDA_DEBUG(1, "%s(), Unknown service!\n", __func__);
1525 return -1;
1526 }
1527
1528 hashbin_remove_this(irlmp->services, (irda_queue_t *) service);
1529 kfree(service);
1530
1531 /* Remove old hint bits */
1532 irlmp->hints.word = 0;
1533
1534 /* Refresh current hint bits */
1535 spin_lock_irqsave(&irlmp->services->hb_spinlock, flags);
1536 service = (irlmp_service_t *) hashbin_get_first(irlmp->services);
1537 while (service) {
1538 irlmp->hints.word |= service->hints.word;
1539
1540 service = (irlmp_service_t *)hashbin_get_next(irlmp->services);
1541 }
1542 spin_unlock_irqrestore(&irlmp->services->hb_spinlock, flags);
1543 return 0;
1544}
1545EXPORT_SYMBOL(irlmp_unregister_service);
1546
1547/*
1548 * Function irlmp_register_client (hint_mask, callback1, callback2)
1549 *
1550 * Register a local client with IrLMP
1551 * First callback is selective discovery (based on hints)
1552 * Second callback is for selective discovery expiries
1553 *
1554 * Returns: handle > 0 on success, 0 on error
1555 */
1556void *irlmp_register_client(__u16 hint_mask, DISCOVERY_CALLBACK1 disco_clb,
1557 DISCOVERY_CALLBACK2 expir_clb, void *priv)
1558{
1559 irlmp_client_t *client;
1560
1561 IRDA_DEBUG(1, "%s()\n", __func__);
1562 IRDA_ASSERT(irlmp != NULL, return NULL;);
1563
1564 /* Make a new registration */
1565 client = kmalloc(sizeof(irlmp_client_t), GFP_ATOMIC);
1566 if (!client) {
1567 IRDA_DEBUG( 1, "%s(), Unable to kmalloc!\n", __func__);
1568 return NULL;
1569 }
1570
1571 /* Register the details */
1572 client->hint_mask.word = hint_mask;
1573 client->disco_callback = disco_clb;
1574 client->expir_callback = expir_clb;
1575 client->priv = priv;
1576
1577 hashbin_insert(irlmp->clients, (irda_queue_t *) client,
1578 (long) client, NULL);
1579
1580 return (void *) client;
1581}
1582EXPORT_SYMBOL(irlmp_register_client);
1583
1584/*
1585 * Function irlmp_update_client (handle, hint_mask, callback1, callback2)
1586 *
1587 * Updates specified client (handle) with possibly new hint_mask and
1588 * callback
1589 *
1590 * Returns: 0 on success, -1 on error
1591 */
1592int irlmp_update_client(void *handle, __u16 hint_mask,
1593 DISCOVERY_CALLBACK1 disco_clb,
1594 DISCOVERY_CALLBACK2 expir_clb, void *priv)
1595{
1596 irlmp_client_t *client;
1597
1598 if (!handle)
1599 return -1;
1600
1601 client = hashbin_lock_find(irlmp->clients, (long) handle, NULL);
1602 if (!client) {
1603 IRDA_DEBUG(1, "%s(), Unknown client!\n", __func__);
1604 return -1;
1605 }
1606
1607 client->hint_mask.word = hint_mask;
1608 client->disco_callback = disco_clb;
1609 client->expir_callback = expir_clb;
1610 client->priv = priv;
1611
1612 return 0;
1613}
1614EXPORT_SYMBOL(irlmp_update_client);
1615
1616/*
1617 * Function irlmp_unregister_client (handle)
1618 *
1619 * Returns: 0 on success, -1 on error
1620 *
1621 */
1622int irlmp_unregister_client(void *handle)
1623{
1624 struct irlmp_client *client;
1625
1626 IRDA_DEBUG(4, "%s()\n", __func__);
1627
1628 if (!handle)
1629 return -1;
1630
1631 /* Caller may call with invalid handle (it's legal) - Jean II */
1632 client = hashbin_lock_find(irlmp->clients, (long) handle, NULL);
1633 if (!client) {
1634 IRDA_DEBUG(1, "%s(), Unknown client!\n", __func__);
1635 return -1;
1636 }
1637
1638 IRDA_DEBUG(4, "%s(), removing client!\n", __func__);
1639 hashbin_remove_this(irlmp->clients, (irda_queue_t *) client);
1640 kfree(client);
1641
1642 return 0;
1643}
1644EXPORT_SYMBOL(irlmp_unregister_client);
1645
1646/*
1647 * Function irlmp_slsap_inuse (slsap)
1648 *
1649 * Check if the given source LSAP selector is in use
1650 *
1651 * This function is clearly not very efficient. On the mitigating side, the
1652 * stack make sure that in 99% of the cases, we are called only once
1653 * for each socket allocation. We could probably keep a bitmap
1654 * of the allocated LSAP, but I'm not sure the complexity is worth it.
1655 * Jean II
1656 */
1657static int irlmp_slsap_inuse(__u8 slsap_sel)
1658{
1659 struct lsap_cb *self;
1660 struct lap_cb *lap;
1661 unsigned long flags;
1662
1663 IRDA_ASSERT(irlmp != NULL, return TRUE;);
1664 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return TRUE;);
1665 IRDA_ASSERT(slsap_sel != LSAP_ANY, return TRUE;);
1666
1667 IRDA_DEBUG(4, "%s()\n", __func__);
1668
1669#ifdef CONFIG_IRDA_ULTRA
1670 /* Accept all bindings to the connectionless LSAP */
1671 if (slsap_sel == LSAP_CONNLESS)
1672 return FALSE;
1673#endif /* CONFIG_IRDA_ULTRA */
1674
1675 /* Valid values are between 0 and 127 (0x0-0x6F) */
1676 if (slsap_sel > LSAP_MAX)
1677 return TRUE;
1678
1679 /*
1680 * Check if slsap is already in use. To do this we have to loop over
1681 * every IrLAP connection and check every LSAP associated with each
1682 * the connection.
1683 */
1684 spin_lock_irqsave_nested(&irlmp->links->hb_spinlock, flags,
1685 SINGLE_DEPTH_NESTING);
1686 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
1687 while (lap != NULL) {
1688 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, goto errlap;);
1689
1690 /* Careful for priority inversions here !
1691 * irlmp->links is never taken while another IrDA
1692 * spinlock is held, so we are safe. Jean II */
1693 spin_lock(&lap->lsaps->hb_spinlock);
1694
1695 /* For this IrLAP, check all the LSAPs */
1696 self = (struct lsap_cb *) hashbin_get_first(lap->lsaps);
1697 while (self != NULL) {
1698 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC,
1699 goto errlsap;);
1700
1701 if ((self->slsap_sel == slsap_sel)) {
1702 IRDA_DEBUG(4, "Source LSAP selector=%02x in use\n",
1703 self->slsap_sel);
1704 goto errlsap;
1705 }
1706 self = (struct lsap_cb*) hashbin_get_next(lap->lsaps);
1707 }
1708 spin_unlock(&lap->lsaps->hb_spinlock);
1709
1710 /* Next LAP */
1711 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
1712 }
1713 spin_unlock_irqrestore(&irlmp->links->hb_spinlock, flags);
1714
1715 /*
1716 * Server sockets are typically waiting for connections and
1717 * therefore reside in the unconnected list. We don't want
1718 * to give out their LSAPs for obvious reasons...
1719 * Jean II
1720 */
1721 spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);
1722
1723 self = (struct lsap_cb *) hashbin_get_first(irlmp->unconnected_lsaps);
1724 while (self != NULL) {
1725 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, goto erruncon;);
1726 if ((self->slsap_sel == slsap_sel)) {
1727 IRDA_DEBUG(4, "Source LSAP selector=%02x in use (unconnected)\n",
1728 self->slsap_sel);
1729 goto erruncon;
1730 }
1731 self = (struct lsap_cb*) hashbin_get_next(irlmp->unconnected_lsaps);
1732 }
1733 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
1734
1735 return FALSE;
1736
1737 /* Error exit from within one of the two nested loops.
1738 * Make sure we release the right spinlock in the righ order.
1739 * Jean II */
1740errlsap:
1741 spin_unlock(&lap->lsaps->hb_spinlock);
1742IRDA_ASSERT_LABEL(errlap:)
1743 spin_unlock_irqrestore(&irlmp->links->hb_spinlock, flags);
1744 return TRUE;
1745
1746 /* Error exit from within the unconnected loop.
1747 * Just one spinlock to release... Jean II */
1748erruncon:
1749 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
1750 return TRUE;
1751}
1752
1753/*
1754 * Function irlmp_find_free_slsap ()
1755 *
1756 * Find a free source LSAP to use. This function is called if the service
1757 * user has requested a source LSAP equal to LM_ANY
1758 */
1759static __u8 irlmp_find_free_slsap(void)
1760{
1761 __u8 lsap_sel;
1762 int wrapped = 0;
1763
1764 IRDA_ASSERT(irlmp != NULL, return -1;);
1765 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return -1;);
1766
1767 /* Most users don't really care which LSAPs they are given,
1768 * and therefore we automatically give them a free LSAP.
1769 * This function try to find a suitable LSAP, i.e. which is
1770 * not in use and is within the acceptable range. Jean II */
1771
1772 do {
1773 /* Always increment to LSAP number before using it.
1774 * In theory, we could reuse the last LSAP number, as long
1775 * as it is no longer in use. Some IrDA stack do that.
1776 * However, the previous socket may be half closed, i.e.
1777 * we closed it, we think it's no longer in use, but the
1778 * other side did not receive our close and think it's
1779 * active and still send data on it.
1780 * This is similar to what is done with PIDs and TCP ports.
1781 * Also, this reduce the number of calls to irlmp_slsap_inuse()
1782 * which is an expensive function to call.
1783 * Jean II */
1784 irlmp->last_lsap_sel++;
1785
1786 /* Check if we need to wraparound (0x70-0x7f are reserved) */
1787 if (irlmp->last_lsap_sel > LSAP_MAX) {
1788 /* 0x00-0x10 are also reserved for well know ports */
1789 irlmp->last_lsap_sel = 0x10;
1790
1791 /* Make sure we terminate the loop */
1792 if (wrapped++) {
1793 IRDA_ERROR("%s: no more free LSAPs !\n",
1794 __func__);
1795 return 0;
1796 }
1797 }
1798
1799 /* If the LSAP is in use, try the next one.
1800 * Despite the autoincrement, we need to check if the lsap
1801 * is really in use or not, first because LSAP may be
1802 * directly allocated in irlmp_open_lsap(), and also because
1803 * we may wraparound on old sockets. Jean II */
1804 } while (irlmp_slsap_inuse(irlmp->last_lsap_sel));
1805
1806 /* Got it ! */
1807 lsap_sel = irlmp->last_lsap_sel;
1808 IRDA_DEBUG(4, "%s(), found free lsap_sel=%02x\n",
1809 __func__, lsap_sel);
1810
1811 return lsap_sel;
1812}
1813
1814/*
1815 * Function irlmp_convert_lap_reason (lap_reason)
1816 *
1817 * Converts IrLAP disconnect reason codes to IrLMP disconnect reason
1818 * codes
1819 *
1820 */
1821LM_REASON irlmp_convert_lap_reason( LAP_REASON lap_reason)
1822{
1823 int reason = LM_LAP_DISCONNECT;
1824
1825 switch (lap_reason) {
1826 case LAP_DISC_INDICATION: /* Received a disconnect request from peer */
1827 IRDA_DEBUG( 1, "%s(), LAP_DISC_INDICATION\n", __func__);
1828 reason = LM_USER_REQUEST;
1829 break;
1830 case LAP_NO_RESPONSE: /* To many retransmits without response */
1831 IRDA_DEBUG( 1, "%s(), LAP_NO_RESPONSE\n", __func__);
1832 reason = LM_LAP_DISCONNECT;
1833 break;
1834 case LAP_RESET_INDICATION:
1835 IRDA_DEBUG( 1, "%s(), LAP_RESET_INDICATION\n", __func__);
1836 reason = LM_LAP_RESET;
1837 break;
1838 case LAP_FOUND_NONE:
1839 case LAP_MEDIA_BUSY:
1840 case LAP_PRIMARY_CONFLICT:
1841 IRDA_DEBUG(1, "%s(), LAP_FOUND_NONE, LAP_MEDIA_BUSY or LAP_PRIMARY_CONFLICT\n", __func__);
1842 reason = LM_CONNECT_FAILURE;
1843 break;
1844 default:
1845 IRDA_DEBUG(1, "%s(), Unknown IrLAP disconnect reason %d!\n",
1846 __func__, lap_reason);
1847 reason = LM_LAP_DISCONNECT;
1848 break;
1849 }
1850
1851 return reason;
1852}
1853
1854#ifdef CONFIG_PROC_FS
1855
1856struct irlmp_iter_state {
1857 hashbin_t *hashbin;
1858};
1859
1860#define LSAP_START_TOKEN ((void *)1)
1861#define LINK_START_TOKEN ((void *)2)
1862
1863static void *irlmp_seq_hb_idx(struct irlmp_iter_state *iter, loff_t *off)
1864{
1865 void *element;
1866
1867 spin_lock_irq(&iter->hashbin->hb_spinlock);
1868 for (element = hashbin_get_first(iter->hashbin);
1869 element != NULL;
1870 element = hashbin_get_next(iter->hashbin)) {
1871 if (!off || *off-- == 0) {
1872 /* NB: hashbin left locked */
1873 return element;
1874 }
1875 }
1876 spin_unlock_irq(&iter->hashbin->hb_spinlock);
1877 iter->hashbin = NULL;
1878 return NULL;
1879}
1880
1881
1882static void *irlmp_seq_start(struct seq_file *seq, loff_t *pos)
1883{
1884 struct irlmp_iter_state *iter = seq->private;
1885 void *v;
1886 loff_t off = *pos;
1887
1888 iter->hashbin = NULL;
1889 if (off-- == 0)
1890 return LSAP_START_TOKEN;
1891
1892 iter->hashbin = irlmp->unconnected_lsaps;
1893 v = irlmp_seq_hb_idx(iter, &off);
1894 if (v)
1895 return v;
1896
1897 if (off-- == 0)
1898 return LINK_START_TOKEN;
1899
1900 iter->hashbin = irlmp->links;
1901 return irlmp_seq_hb_idx(iter, &off);
1902}
1903
1904static void *irlmp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1905{
1906 struct irlmp_iter_state *iter = seq->private;
1907
1908 ++*pos;
1909
1910 if (v == LSAP_START_TOKEN) { /* start of list of lsaps */
1911 iter->hashbin = irlmp->unconnected_lsaps;
1912 v = irlmp_seq_hb_idx(iter, NULL);
1913 return v ? v : LINK_START_TOKEN;
1914 }
1915
1916 if (v == LINK_START_TOKEN) { /* start of list of links */
1917 iter->hashbin = irlmp->links;
1918 return irlmp_seq_hb_idx(iter, NULL);
1919 }
1920
1921 v = hashbin_get_next(iter->hashbin);
1922
1923 if (v == NULL) { /* no more in this hash bin */
1924 spin_unlock_irq(&iter->hashbin->hb_spinlock);
1925
1926 if (iter->hashbin == irlmp->unconnected_lsaps)
1927 v = LINK_START_TOKEN;
1928
1929 iter->hashbin = NULL;
1930 }
1931 return v;
1932}
1933
1934static void irlmp_seq_stop(struct seq_file *seq, void *v)
1935{
1936 struct irlmp_iter_state *iter = seq->private;
1937
1938 if (iter->hashbin)
1939 spin_unlock_irq(&iter->hashbin->hb_spinlock);
1940}
1941
1942static int irlmp_seq_show(struct seq_file *seq, void *v)
1943{
1944 const struct irlmp_iter_state *iter = seq->private;
1945 struct lsap_cb *self = v;
1946
1947 if (v == LSAP_START_TOKEN)
1948 seq_puts(seq, "Unconnected LSAPs:\n");
1949 else if (v == LINK_START_TOKEN)
1950 seq_puts(seq, "\nRegistered Link Layers:\n");
1951 else if (iter->hashbin == irlmp->unconnected_lsaps) {
1952 self = v;
1953 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -EINVAL; );
1954 seq_printf(seq, "lsap state: %s, ",
1955 irlsap_state[ self->lsap_state]);
1956 seq_printf(seq,
1957 "slsap_sel: %#02x, dlsap_sel: %#02x, ",
1958 self->slsap_sel, self->dlsap_sel);
1959 seq_printf(seq, "(%s)", self->notify.name);
1960 seq_printf(seq, "\n");
1961 } else if (iter->hashbin == irlmp->links) {
1962 struct lap_cb *lap = v;
1963
1964 seq_printf(seq, "lap state: %s, ",
1965 irlmp_state[lap->lap_state]);
1966
1967 seq_printf(seq, "saddr: %#08x, daddr: %#08x, ",
1968 lap->saddr, lap->daddr);
1969 seq_printf(seq, "num lsaps: %d",
1970 HASHBIN_GET_SIZE(lap->lsaps));
1971 seq_printf(seq, "\n");
1972
1973 /* Careful for priority inversions here !
1974 * All other uses of attrib spinlock are independent of
1975 * the object spinlock, so we are safe. Jean II */
1976 spin_lock(&lap->lsaps->hb_spinlock);
1977
1978 seq_printf(seq, "\n Connected LSAPs:\n");
1979 for (self = (struct lsap_cb *) hashbin_get_first(lap->lsaps);
1980 self != NULL;
1981 self = (struct lsap_cb *)hashbin_get_next(lap->lsaps)) {
1982 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC,
1983 goto outloop;);
1984 seq_printf(seq, " lsap state: %s, ",
1985 irlsap_state[ self->lsap_state]);
1986 seq_printf(seq,
1987 "slsap_sel: %#02x, dlsap_sel: %#02x, ",
1988 self->slsap_sel, self->dlsap_sel);
1989 seq_printf(seq, "(%s)", self->notify.name);
1990 seq_putc(seq, '\n');
1991
1992 }
1993 IRDA_ASSERT_LABEL(outloop:)
1994 spin_unlock(&lap->lsaps->hb_spinlock);
1995 seq_putc(seq, '\n');
1996 } else
1997 return -EINVAL;
1998
1999 return 0;
2000}
2001
2002static const struct seq_operations irlmp_seq_ops = {
2003 .start = irlmp_seq_start,
2004 .next = irlmp_seq_next,
2005 .stop = irlmp_seq_stop,
2006 .show = irlmp_seq_show,
2007};
2008
2009static int irlmp_seq_open(struct inode *inode, struct file *file)
2010{
2011 IRDA_ASSERT(irlmp != NULL, return -EINVAL;);
2012
2013 return seq_open_private(file, &irlmp_seq_ops,
2014 sizeof(struct irlmp_iter_state));
2015}
2016
2017const struct file_operations irlmp_seq_fops = {
2018 .owner = THIS_MODULE,
2019 .open = irlmp_seq_open,
2020 .read = seq_read,
2021 .llseek = seq_lseek,
2022 .release = seq_release_private,
2023};
2024
2025#endif /* PROC_FS */