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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
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 */
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 IRDA_DEBUG(1, "%s()\n", __func__);
87 /* Initialize the irlmp structure. */
88 irlmp = kzalloc( sizeof(struct irlmp_cb), GFP_KERNEL);
89 if (irlmp == NULL)
90 return -ENOMEM;
91
92 irlmp->magic = LMP_MAGIC;
93
94 irlmp->clients = hashbin_new(HB_LOCK);
95 irlmp->services = hashbin_new(HB_LOCK);
96 irlmp->links = hashbin_new(HB_LOCK);
97 irlmp->unconnected_lsaps = hashbin_new(HB_LOCK);
98 irlmp->cachelog = hashbin_new(HB_NOLOCK);
99
100 if ((irlmp->clients == NULL) ||
101 (irlmp->services == NULL) ||
102 (irlmp->links == NULL) ||
103 (irlmp->unconnected_lsaps == NULL) ||
104 (irlmp->cachelog == NULL)) {
105 return -ENOMEM;
106 }
107
108 spin_lock_init(&irlmp->cachelog->hb_spinlock);
109
110 irlmp->last_lsap_sel = 0x0f; /* Reserved 0x00-0x0f */
111 strcpy(sysctl_devname, "Linux");
112
113 init_timer(&irlmp->discovery_timer);
114
115 /* Do discovery every 3 seconds, conditionally */
116 if (sysctl_discovery)
117 irlmp_start_discovery_timer(irlmp,
118 sysctl_discovery_timeout*HZ);
119
120 return 0;
121}
122
123/*
124 * Function irlmp_cleanup (void)
125 *
126 * Remove IrLMP layer
127 *
128 */
129void irlmp_cleanup(void)
130{
131 /* Check for main structure */
132 IRDA_ASSERT(irlmp != NULL, return;);
133 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
134
135 del_timer(&irlmp->discovery_timer);
136
137 hashbin_delete(irlmp->links, (FREE_FUNC) kfree);
138 hashbin_delete(irlmp->unconnected_lsaps, (FREE_FUNC) kfree);
139 hashbin_delete(irlmp->clients, (FREE_FUNC) kfree);
140 hashbin_delete(irlmp->services, (FREE_FUNC) kfree);
141 hashbin_delete(irlmp->cachelog, (FREE_FUNC) kfree);
142
143 /* De-allocate main structure */
144 kfree(irlmp);
145 irlmp = NULL;
146}
147
148/*
149 * Function irlmp_open_lsap (slsap, notify)
150 *
151 * Register with IrLMP and create a local LSAP,
152 * returns handle to LSAP.
153 */
154struct lsap_cb *irlmp_open_lsap(__u8 slsap_sel, notify_t *notify, __u8 pid)
155{
156 struct lsap_cb *self;
157
158 IRDA_ASSERT(notify != NULL, return NULL;);
159 IRDA_ASSERT(irlmp != NULL, return NULL;);
160 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return NULL;);
161 IRDA_ASSERT(notify->instance != NULL, return NULL;);
162
163 /* Does the client care which Source LSAP selector it gets? */
164 if (slsap_sel == LSAP_ANY) {
165 slsap_sel = irlmp_find_free_slsap();
166 if (!slsap_sel)
167 return NULL;
168 } else if (irlmp_slsap_inuse(slsap_sel))
169 return NULL;
170
171 /* Allocate new instance of a LSAP connection */
172 self = kzalloc(sizeof(struct lsap_cb), GFP_ATOMIC);
173 if (self == NULL) {
174 IRDA_ERROR("%s: can't allocate memory\n", __func__);
175 return NULL;
176 }
177
178 self->magic = LMP_LSAP_MAGIC;
179 self->slsap_sel = slsap_sel;
180
181 /* Fix connectionless LSAP's */
182 if (slsap_sel == LSAP_CONNLESS) {
183#ifdef CONFIG_IRDA_ULTRA
184 self->dlsap_sel = LSAP_CONNLESS;
185 self->pid = pid;
186#endif /* CONFIG_IRDA_ULTRA */
187 } else
188 self->dlsap_sel = LSAP_ANY;
189 /* self->connected = FALSE; -> already NULL via memset() */
190
191 init_timer(&self->watchdog_timer);
192
193 self->notify = *notify;
194
195 self->lsap_state = LSAP_DISCONNECTED;
196
197 /* Insert into queue of unconnected LSAPs */
198 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
199 (long) self, NULL);
200
201 return self;
202}
203EXPORT_SYMBOL(irlmp_open_lsap);
204
205/*
206 * Function __irlmp_close_lsap (self)
207 *
208 * Remove an instance of LSAP
209 */
210static void __irlmp_close_lsap(struct lsap_cb *self)
211{
212 IRDA_DEBUG(4, "%s()\n", __func__);
213
214 IRDA_ASSERT(self != NULL, return;);
215 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
216
217 /*
218 * Set some of the variables to preset values
219 */
220 self->magic = 0;
221 del_timer(&self->watchdog_timer); /* Important! */
222
223 if (self->conn_skb)
224 dev_kfree_skb(self->conn_skb);
225
226 kfree(self);
227}
228
229/*
230 * Function irlmp_close_lsap (self)
231 *
232 * Close and remove LSAP
233 *
234 */
235void irlmp_close_lsap(struct lsap_cb *self)
236{
237 struct lap_cb *lap;
238 struct lsap_cb *lsap = NULL;
239
240 IRDA_ASSERT(self != NULL, return;);
241 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
242
243 /*
244 * Find out if we should remove this LSAP from a link or from the
245 * list of unconnected lsaps (not associated with a link)
246 */
247 lap = self->lap;
248 if (lap) {
249 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
250 /* We might close a LSAP before it has completed the
251 * connection setup. In those case, higher layers won't
252 * send a proper disconnect request. Harmless, except
253 * that we will forget to close LAP... - Jean II */
254 if(self->lsap_state != LSAP_DISCONNECTED) {
255 self->lsap_state = LSAP_DISCONNECTED;
256 irlmp_do_lap_event(self->lap,
257 LM_LAP_DISCONNECT_REQUEST, NULL);
258 }
259 /* Now, remove from the link */
260 lsap = hashbin_remove(lap->lsaps, (long) self, NULL);
261#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
262 lap->cache.valid = FALSE;
263#endif
264 }
265 self->lap = NULL;
266 /* Check if we found the LSAP! If not then try the unconnected lsaps */
267 if (!lsap) {
268 lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self,
269 NULL);
270 }
271 if (!lsap) {
272 IRDA_DEBUG(0,
273 "%s(), Looks like somebody has removed me already!\n",
274 __func__);
275 return;
276 }
277 __irlmp_close_lsap(self);
278}
279EXPORT_SYMBOL(irlmp_close_lsap);
280
281/*
282 * Function irlmp_register_irlap (saddr, notify)
283 *
284 * Register IrLAP layer with IrLMP. There is possible to have multiple
285 * instances of the IrLAP layer, each connected to different IrDA ports
286 *
287 */
288void irlmp_register_link(struct irlap_cb *irlap, __u32 saddr, notify_t *notify)
289{
290 struct lap_cb *lap;
291
292 IRDA_ASSERT(irlmp != NULL, return;);
293 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
294 IRDA_ASSERT(notify != NULL, return;);
295
296 /*
297 * Allocate new instance of a LSAP connection
298 */
299 lap = kzalloc(sizeof(struct lap_cb), GFP_KERNEL);
300 if (lap == NULL) {
301 IRDA_ERROR("%s: unable to kmalloc\n", __func__);
302 return;
303 }
304
305 lap->irlap = irlap;
306 lap->magic = LMP_LAP_MAGIC;
307 lap->saddr = saddr;
308 lap->daddr = DEV_ADDR_ANY;
309#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
310 lap->cache.valid = FALSE;
311#endif
312 lap->lsaps = hashbin_new(HB_LOCK);
313 if (lap->lsaps == NULL) {
314 IRDA_WARNING("%s(), unable to kmalloc lsaps\n", __func__);
315 kfree(lap);
316 return;
317 }
318
319 lap->lap_state = LAP_STANDBY;
320
321 init_timer(&lap->idle_timer);
322
323 /*
324 * Insert into queue of LMP links
325 */
326 hashbin_insert(irlmp->links, (irda_queue_t *) lap, lap->saddr, NULL);
327
328 /*
329 * We set only this variable so IrLAP can tell us on which link the
330 * different events happened on
331 */
332 irda_notify_init(notify);
333 notify->instance = lap;
334}
335
336/*
337 * Function irlmp_unregister_irlap (saddr)
338 *
339 * IrLAP layer has been removed!
340 *
341 */
342void irlmp_unregister_link(__u32 saddr)
343{
344 struct lap_cb *link;
345
346 IRDA_DEBUG(4, "%s()\n", __func__);
347
348 /* We must remove ourselves from the hashbin *first*. This ensure
349 * that no more LSAPs will be open on this link and no discovery
350 * will be triggered anymore. Jean II */
351 link = hashbin_remove(irlmp->links, saddr, NULL);
352 if (link) {
353 IRDA_ASSERT(link->magic == LMP_LAP_MAGIC, return;);
354
355 /* Kill all the LSAPs on this link. Jean II */
356 link->reason = LAP_DISC_INDICATION;
357 link->daddr = DEV_ADDR_ANY;
358 irlmp_do_lap_event(link, LM_LAP_DISCONNECT_INDICATION, NULL);
359
360 /* Remove all discoveries discovered at this link */
361 irlmp_expire_discoveries(irlmp->cachelog, link->saddr, TRUE);
362
363 /* Final cleanup */
364 del_timer(&link->idle_timer);
365 link->magic = 0;
366 hashbin_delete(link->lsaps, (FREE_FUNC) __irlmp_close_lsap);
367 kfree(link);
368 }
369}
370
371/*
372 * Function irlmp_connect_request (handle, dlsap, userdata)
373 *
374 * Connect with a peer LSAP
375 *
376 */
377int irlmp_connect_request(struct lsap_cb *self, __u8 dlsap_sel,
378 __u32 saddr, __u32 daddr,
379 struct qos_info *qos, struct sk_buff *userdata)
380{
381 struct sk_buff *tx_skb = userdata;
382 struct lap_cb *lap;
383 struct lsap_cb *lsap;
384 int ret;
385
386 IRDA_ASSERT(self != NULL, return -EBADR;);
387 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -EBADR;);
388
389 IRDA_DEBUG(2,
390 "%s(), slsap_sel=%02x, dlsap_sel=%02x, saddr=%08x, daddr=%08x\n",
391 __func__, self->slsap_sel, dlsap_sel, saddr, daddr);
392
393 if (test_bit(0, &self->connected)) {
394 ret = -EISCONN;
395 goto err;
396 }
397
398 /* Client must supply destination device address */
399 if (!daddr) {
400 ret = -EINVAL;
401 goto err;
402 }
403
404 /* Any userdata? */
405 if (tx_skb == NULL) {
406 tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
407 if (!tx_skb)
408 return -ENOMEM;
409
410 skb_reserve(tx_skb, LMP_MAX_HEADER);
411 }
412
413 /* Make room for MUX control header (3 bytes) */
414 IRDA_ASSERT(skb_headroom(tx_skb) >= LMP_CONTROL_HEADER, return -1;);
415 skb_push(tx_skb, LMP_CONTROL_HEADER);
416
417 self->dlsap_sel = dlsap_sel;
418
419 /*
420 * Find the link to where we should try to connect since there may
421 * be more than one IrDA port on this machine. If the client has
422 * passed us the saddr (and already knows which link to use), then
423 * we use that to find the link, if not then we have to look in the
424 * discovery log and check if any of the links has discovered a
425 * device with the given daddr
426 */
427 if ((!saddr) || (saddr == DEV_ADDR_ANY)) {
428 discovery_t *discovery;
429 unsigned long flags;
430
431 spin_lock_irqsave(&irlmp->cachelog->hb_spinlock, flags);
432 if (daddr != DEV_ADDR_ANY)
433 discovery = hashbin_find(irlmp->cachelog, daddr, NULL);
434 else {
435 IRDA_DEBUG(2, "%s(), no daddr\n", __func__);
436 discovery = (discovery_t *)
437 hashbin_get_first(irlmp->cachelog);
438 }
439
440 if (discovery) {
441 saddr = discovery->data.saddr;
442 daddr = discovery->data.daddr;
443 }
444 spin_unlock_irqrestore(&irlmp->cachelog->hb_spinlock, flags);
445 }
446 lap = hashbin_lock_find(irlmp->links, saddr, NULL);
447 if (lap == NULL) {
448 IRDA_DEBUG(1, "%s(), Unable to find a usable link!\n", __func__);
449 ret = -EHOSTUNREACH;
450 goto err;
451 }
452
453 /* Check if LAP is disconnected or already connected */
454 if (lap->daddr == DEV_ADDR_ANY)
455 lap->daddr = daddr;
456 else if (lap->daddr != daddr) {
457 /* Check if some LSAPs are active on this LAP */
458 if (HASHBIN_GET_SIZE(lap->lsaps) == 0) {
459 /* No active connection, but LAP hasn't been
460 * disconnected yet (waiting for timeout in LAP).
461 * Maybe we could give LAP a bit of help in this case.
462 */
463 IRDA_DEBUG(0, "%s(), sorry, but I'm waiting for LAP to timeout!\n", __func__);
464 ret = -EAGAIN;
465 goto err;
466 }
467
468 /* LAP is already connected to a different node, and LAP
469 * can only talk to one node at a time */
470 IRDA_DEBUG(0, "%s(), sorry, but link is busy!\n", __func__);
471 ret = -EBUSY;
472 goto err;
473 }
474
475 self->lap = lap;
476
477 /*
478 * Remove LSAP from list of unconnected LSAPs and insert it into the
479 * list of connected LSAPs for the particular link
480 */
481 lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self, NULL);
482
483 IRDA_ASSERT(lsap != NULL, return -1;);
484 IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
485 IRDA_ASSERT(lsap->lap != NULL, return -1;);
486 IRDA_ASSERT(lsap->lap->magic == LMP_LAP_MAGIC, return -1;);
487
488 hashbin_insert(self->lap->lsaps, (irda_queue_t *) self, (long) self,
489 NULL);
490
491 set_bit(0, &self->connected); /* TRUE */
492
493 /*
494 * User supplied qos specifications?
495 */
496 if (qos)
497 self->qos = *qos;
498
499 irlmp_do_lsap_event(self, LM_CONNECT_REQUEST, tx_skb);
500
501 /* Drop reference count - see irlap_data_request(). */
502 dev_kfree_skb(tx_skb);
503
504 return 0;
505
506err:
507 /* Cleanup */
508 if(tx_skb)
509 dev_kfree_skb(tx_skb);
510 return ret;
511}
512EXPORT_SYMBOL(irlmp_connect_request);
513
514/*
515 * Function irlmp_connect_indication (self)
516 *
517 * Incoming connection
518 *
519 */
520void irlmp_connect_indication(struct lsap_cb *self, struct sk_buff *skb)
521{
522 int max_seg_size;
523 int lap_header_size;
524 int max_header_size;
525
526 IRDA_ASSERT(self != NULL, return;);
527 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
528 IRDA_ASSERT(skb != NULL, return;);
529 IRDA_ASSERT(self->lap != NULL, return;);
530
531 IRDA_DEBUG(2, "%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
532 __func__, self->slsap_sel, self->dlsap_sel);
533
534 /* Note : self->lap is set in irlmp_link_data_indication(),
535 * (case CONNECT_CMD:) because we have no way to set it here.
536 * Similarly, self->dlsap_sel is usually set in irlmp_find_lsap().
537 * Jean II */
538
539 self->qos = *self->lap->qos;
540
541 max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
542 lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
543 max_header_size = LMP_HEADER + lap_header_size;
544
545 /* Hide LMP_CONTROL_HEADER header from layer above */
546 skb_pull(skb, LMP_CONTROL_HEADER);
547
548 if (self->notify.connect_indication) {
549 /* Don't forget to refcount it - see irlap_driver_rcv(). */
550 skb_get(skb);
551 self->notify.connect_indication(self->notify.instance, self,
552 &self->qos, max_seg_size,
553 max_header_size, skb);
554 }
555}
556
557/*
558 * Function irlmp_connect_response (handle, userdata)
559 *
560 * Service user is accepting connection
561 *
562 */
563int irlmp_connect_response(struct lsap_cb *self, struct sk_buff *userdata)
564{
565 IRDA_ASSERT(self != NULL, return -1;);
566 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
567 IRDA_ASSERT(userdata != NULL, return -1;);
568
569 /* We set the connected bit and move the lsap to the connected list
570 * in the state machine itself. Jean II */
571
572 IRDA_DEBUG(2, "%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
573 __func__, self->slsap_sel, self->dlsap_sel);
574
575 /* Make room for MUX control header (3 bytes) */
576 IRDA_ASSERT(skb_headroom(userdata) >= LMP_CONTROL_HEADER, return -1;);
577 skb_push(userdata, LMP_CONTROL_HEADER);
578
579 irlmp_do_lsap_event(self, LM_CONNECT_RESPONSE, userdata);
580
581 /* Drop reference count - see irlap_data_request(). */
582 dev_kfree_skb(userdata);
583
584 return 0;
585}
586EXPORT_SYMBOL(irlmp_connect_response);
587
588/*
589 * Function irlmp_connect_confirm (handle, skb)
590 *
591 * LSAP connection confirmed peer device!
592 */
593void irlmp_connect_confirm(struct lsap_cb *self, struct sk_buff *skb)
594{
595 int max_header_size;
596 int lap_header_size;
597 int max_seg_size;
598
599 IRDA_DEBUG(3, "%s()\n", __func__);
600
601 IRDA_ASSERT(skb != NULL, return;);
602 IRDA_ASSERT(self != NULL, return;);
603 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
604 IRDA_ASSERT(self->lap != NULL, return;);
605
606 self->qos = *self->lap->qos;
607
608 max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
609 lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
610 max_header_size = LMP_HEADER + lap_header_size;
611
612 IRDA_DEBUG(2, "%s(), max_header_size=%d\n",
613 __func__, max_header_size);
614
615 /* Hide LMP_CONTROL_HEADER header from layer above */
616 skb_pull(skb, LMP_CONTROL_HEADER);
617
618 if (self->notify.connect_confirm) {
619 /* Don't forget to refcount it - see irlap_driver_rcv() */
620 skb_get(skb);
621 self->notify.connect_confirm(self->notify.instance, self,
622 &self->qos, max_seg_size,
623 max_header_size, skb);
624 }
625}
626
627/*
628 * Function irlmp_dup (orig, instance)
629 *
630 * Duplicate LSAP, can be used by servers to confirm a connection on a
631 * new LSAP so it can keep listening on the old one.
632 *
633 */
634struct lsap_cb *irlmp_dup(struct lsap_cb *orig, void *instance)
635{
636 struct lsap_cb *new;
637 unsigned long flags;
638
639 IRDA_DEBUG(1, "%s()\n", __func__);
640
641 spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);
642
643 /* Only allowed to duplicate unconnected LSAP's, and only LSAPs
644 * that have received a connect indication. Jean II */
645 if ((!hashbin_find(irlmp->unconnected_lsaps, (long) orig, NULL)) ||
646 (orig->lap == NULL)) {
647 IRDA_DEBUG(0, "%s(), invalid LSAP (wrong state)\n",
648 __func__);
649 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
650 flags);
651 return NULL;
652 }
653
654 /* Allocate a new instance */
655 new = kmemdup(orig, sizeof(*new), GFP_ATOMIC);
656 if (!new) {
657 IRDA_DEBUG(0, "%s(), unable to kmalloc\n", __func__);
658 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
659 flags);
660 return NULL;
661 }
662 /* new->lap = orig->lap; => done in the memcpy() */
663 /* new->slsap_sel = orig->slsap_sel; => done in the memcpy() */
664 new->conn_skb = NULL;
665
666 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
667
668 /* Not everything is the same */
669 new->notify.instance = instance;
670
671 init_timer(&new->watchdog_timer);
672
673 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) new,
674 (long) new, NULL);
675
676#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
677 /* Make sure that we invalidate the LSAP cache */
678 new->lap->cache.valid = FALSE;
679#endif /* CONFIG_IRDA_CACHE_LAST_LSAP */
680
681 return new;
682}
683
684/*
685 * Function irlmp_disconnect_request (handle, userdata)
686 *
687 * The service user is requesting disconnection, this will not remove the
688 * LSAP, but only mark it as disconnected
689 */
690int irlmp_disconnect_request(struct lsap_cb *self, struct sk_buff *userdata)
691{
692 struct lsap_cb *lsap;
693
694 IRDA_ASSERT(self != NULL, return -1;);
695 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
696 IRDA_ASSERT(userdata != NULL, return -1;);
697
698 /* Already disconnected ?
699 * There is a race condition between irlmp_disconnect_indication()
700 * and us that might mess up the hashbins below. This fixes it.
701 * Jean II */
702 if (! test_and_clear_bit(0, &self->connected)) {
703 IRDA_DEBUG(0, "%s(), already disconnected!\n", __func__);
704 dev_kfree_skb(userdata);
705 return -1;
706 }
707
708 skb_push(userdata, LMP_CONTROL_HEADER);
709
710 /*
711 * Do the event before the other stuff since we must know
712 * which lap layer that the frame should be transmitted on
713 */
714 irlmp_do_lsap_event(self, LM_DISCONNECT_REQUEST, userdata);
715
716 /* Drop reference count - see irlap_data_request(). */
717 dev_kfree_skb(userdata);
718
719 /*
720 * Remove LSAP from list of connected LSAPs for the particular link
721 * and insert it into the list of unconnected LSAPs
722 */
723 IRDA_ASSERT(self->lap != NULL, return -1;);
724 IRDA_ASSERT(self->lap->magic == LMP_LAP_MAGIC, return -1;);
725 IRDA_ASSERT(self->lap->lsaps != NULL, return -1;);
726
727 lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
728#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
729 self->lap->cache.valid = FALSE;
730#endif
731
732 IRDA_ASSERT(lsap != NULL, return -1;);
733 IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
734 IRDA_ASSERT(lsap == self, return -1;);
735
736 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
737 (long) self, NULL);
738
739 /* Reset some values */
740 self->dlsap_sel = LSAP_ANY;
741 self->lap = NULL;
742
743 return 0;
744}
745EXPORT_SYMBOL(irlmp_disconnect_request);
746
747/*
748 * Function irlmp_disconnect_indication (reason, userdata)
749 *
750 * LSAP is being closed!
751 */
752void irlmp_disconnect_indication(struct lsap_cb *self, LM_REASON reason,
753 struct sk_buff *skb)
754{
755 struct lsap_cb *lsap;
756
757 IRDA_DEBUG(1, "%s(), reason=%s [%d]\n", __func__,
758 irlmp_reason_str(reason), reason);
759 IRDA_ASSERT(self != NULL, return;);
760 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
761
762 IRDA_DEBUG(3, "%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
763 __func__, self->slsap_sel, self->dlsap_sel);
764
765 /* Already disconnected ?
766 * There is a race condition between irlmp_disconnect_request()
767 * and us that might mess up the hashbins below. This fixes it.
768 * Jean II */
769 if (! test_and_clear_bit(0, &self->connected)) {
770 IRDA_DEBUG(0, "%s(), already disconnected!\n", __func__);
771 return;
772 }
773
774 /*
775 * Remove association between this LSAP and the link it used
776 */
777 IRDA_ASSERT(self->lap != NULL, return;);
778 IRDA_ASSERT(self->lap->lsaps != NULL, return;);
779
780 lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
781#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
782 self->lap->cache.valid = FALSE;
783#endif
784
785 IRDA_ASSERT(lsap != NULL, return;);
786 IRDA_ASSERT(lsap == self, return;);
787 hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) lsap,
788 (long) lsap, NULL);
789
790 self->dlsap_sel = LSAP_ANY;
791 self->lap = NULL;
792
793 /*
794 * Inform service user
795 */
796 if (self->notify.disconnect_indication) {
797 /* Don't forget to refcount it - see irlap_driver_rcv(). */
798 if(skb)
799 skb_get(skb);
800 self->notify.disconnect_indication(self->notify.instance,
801 self, reason, skb);
802 } else {
803 IRDA_DEBUG(0, "%s(), no handler\n", __func__);
804 }
805}
806
807/*
808 * Function irlmp_do_expiry (void)
809 *
810 * Do a cleanup of the discovery log (remove old entries)
811 *
812 * Note : separate from irlmp_do_discovery() so that we can handle
813 * passive discovery properly.
814 */
815void irlmp_do_expiry(void)
816{
817 struct lap_cb *lap;
818
819 /*
820 * Expire discovery on all links which are *not* connected.
821 * On links which are connected, we can't do discovery
822 * anymore and can't refresh the log, so we freeze the
823 * discovery log to keep info about the device we are
824 * connected to.
825 * This info is mandatory if we want irlmp_connect_request()
826 * to work properly. - Jean II
827 */
828 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
829 while (lap != NULL) {
830 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
831
832 if (lap->lap_state == LAP_STANDBY) {
833 /* Expire discoveries discovered on this link */
834 irlmp_expire_discoveries(irlmp->cachelog, lap->saddr,
835 FALSE);
836 }
837 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
838 }
839}
840
841/*
842 * Function irlmp_do_discovery (nslots)
843 *
844 * Do some discovery on all links
845 *
846 * Note : log expiry is done above.
847 */
848void irlmp_do_discovery(int nslots)
849{
850 struct lap_cb *lap;
851 __u16 *data_hintsp;
852
853 /* Make sure the value is sane */
854 if ((nslots != 1) && (nslots != 6) && (nslots != 8) && (nslots != 16)){
855 IRDA_WARNING("%s: invalid value for number of slots!\n",
856 __func__);
857 nslots = sysctl_discovery_slots = 8;
858 }
859
860 /* Construct new discovery info to be used by IrLAP, */
861 data_hintsp = (__u16 *) irlmp->discovery_cmd.data.hints;
862 put_unaligned(irlmp->hints.word, data_hintsp);
863
864 /*
865 * Set character set for device name (we use ASCII), and
866 * copy device name. Remember to make room for a \0 at the
867 * end
868 */
869 irlmp->discovery_cmd.data.charset = CS_ASCII;
870 strncpy(irlmp->discovery_cmd.data.info, sysctl_devname,
871 NICKNAME_MAX_LEN);
872 irlmp->discovery_cmd.name_len = strlen(irlmp->discovery_cmd.data.info);
873 irlmp->discovery_cmd.nslots = nslots;
874
875 /*
876 * Try to send discovery packets on all links
877 */
878 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
879 while (lap != NULL) {
880 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
881
882 if (lap->lap_state == LAP_STANDBY) {
883 /* Try to discover */
884 irlmp_do_lap_event(lap, LM_LAP_DISCOVERY_REQUEST,
885 NULL);
886 }
887 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
888 }
889}
890
891/*
892 * Function irlmp_discovery_request (nslots)
893 *
894 * Do a discovery of devices in front of the computer
895 *
896 * If the caller has registered a client discovery callback, this
897 * allow him to receive the full content of the discovery log through
898 * this callback (as normally he will receive only new discoveries).
899 */
900void irlmp_discovery_request(int nslots)
901{
902 /* Return current cached discovery log (in full) */
903 irlmp_discovery_confirm(irlmp->cachelog, DISCOVERY_LOG);
904
905 /*
906 * Start a single discovery operation if discovery is not already
907 * running
908 */
909 if (!sysctl_discovery) {
910 /* Check if user wants to override the default */
911 if (nslots == DISCOVERY_DEFAULT_SLOTS)
912 nslots = sysctl_discovery_slots;
913
914 irlmp_do_discovery(nslots);
915 /* Note : we never do expiry here. Expiry will run on the
916 * discovery timer regardless of the state of sysctl_discovery
917 * Jean II */
918 }
919}
920EXPORT_SYMBOL(irlmp_discovery_request);
921
922/*
923 * Function irlmp_get_discoveries (pn, mask, slots)
924 *
925 * Return the current discovery log
926 *
927 * If discovery is not enabled, you should call this function again
928 * after 1 or 2 seconds (i.e. after discovery has been done).
929 */
930struct irda_device_info *irlmp_get_discoveries(int *pn, __u16 mask, int nslots)
931{
932 /* If discovery is not enabled, it's likely that the discovery log
933 * will be empty. So, we trigger a single discovery, so that next
934 * time the user call us there might be some results in the log.
935 * Jean II
936 */
937 if (!sysctl_discovery) {
938 /* Check if user wants to override the default */
939 if (nslots == DISCOVERY_DEFAULT_SLOTS)
940 nslots = sysctl_discovery_slots;
941
942 /* Start discovery - will complete sometime later */
943 irlmp_do_discovery(nslots);
944 /* Note : we never do expiry here. Expiry will run on the
945 * discovery timer regardless of the state of sysctl_discovery
946 * Jean II */
947 }
948
949 /* Return current cached discovery log */
950 return irlmp_copy_discoveries(irlmp->cachelog, pn, mask, TRUE);
951}
952EXPORT_SYMBOL(irlmp_get_discoveries);
953
954/*
955 * Function irlmp_notify_client (log)
956 *
957 * Notify all about discovered devices
958 *
959 * Clients registered with IrLMP are :
960 * o IrComm
961 * o IrLAN
962 * o Any socket (in any state - ouch, that may be a lot !)
963 * The client may have defined a callback to be notified in case of
964 * partial/selective discovery based on the hints that it passed to IrLMP.
965 */
966static inline void
967irlmp_notify_client(irlmp_client_t *client,
968 hashbin_t *log, DISCOVERY_MODE mode)
969{
970 discinfo_t *discoveries; /* Copy of the discovery log */
971 int number; /* Number of nodes in the log */
972 int i;
973
974 IRDA_DEBUG(3, "%s()\n", __func__);
975
976 /* Check if client wants or not partial/selective log (optimisation) */
977 if (!client->disco_callback)
978 return;
979
980 /*
981 * Locking notes :
982 * the old code was manipulating the log directly, which was
983 * very racy. Now, we use copy_discoveries, that protects
984 * itself while dumping the log for us.
985 * The overhead of the copy is compensated by the fact that
986 * we only pass new discoveries in normal mode and don't
987 * pass the same old entry every 3s to the caller as we used
988 * to do (virtual function calling is expensive).
989 * Jean II
990 */
991
992 /*
993 * Now, check all discovered devices (if any), and notify client
994 * only about the services that the client is interested in
995 * We also notify only about the new devices unless the caller
996 * explicitly request a dump of the log. Jean II
997 */
998 discoveries = irlmp_copy_discoveries(log, &number,
999 client->hint_mask.word,
1000 (mode == DISCOVERY_LOG));
1001 /* Check if the we got some results */
1002 if (discoveries == NULL)
1003 return; /* No nodes discovered */
1004
1005 /* Pass all entries to the listener */
1006 for(i = 0; i < number; i++)
1007 client->disco_callback(&(discoveries[i]), mode, client->priv);
1008
1009 /* Free up our buffer */
1010 kfree(discoveries);
1011}
1012
1013/*
1014 * Function irlmp_discovery_confirm ( self, log)
1015 *
1016 * Some device(s) answered to our discovery request! Check to see which
1017 * device it is, and give indication to the client(s)
1018 *
1019 */
1020void irlmp_discovery_confirm(hashbin_t *log, DISCOVERY_MODE mode)
1021{
1022 irlmp_client_t *client;
1023 irlmp_client_t *client_next;
1024
1025 IRDA_DEBUG(3, "%s()\n", __func__);
1026
1027 IRDA_ASSERT(log != NULL, return;);
1028
1029 if (!(HASHBIN_GET_SIZE(log)))
1030 return;
1031
1032 /* For each client - notify callback may touch client list */
1033 client = (irlmp_client_t *) hashbin_get_first(irlmp->clients);
1034 while (NULL != hashbin_find_next(irlmp->clients, (long) client, NULL,
1035 (void *) &client_next) ) {
1036 /* Check if we should notify client */
1037 irlmp_notify_client(client, log, mode);
1038
1039 client = client_next;
1040 }
1041}
1042
1043/*
1044 * Function irlmp_discovery_expiry (expiry)
1045 *
1046 * This device is no longer been discovered, and therefore it is being
1047 * purged from the discovery log. Inform all clients who have
1048 * registered for this event...
1049 *
1050 * Note : called exclusively from discovery.c
1051 * Note : this is no longer called under discovery spinlock, so the
1052 * client can do whatever he wants in the callback.
1053 */
1054void irlmp_discovery_expiry(discinfo_t *expiries, int number)
1055{
1056 irlmp_client_t *client;
1057 irlmp_client_t *client_next;
1058 int i;
1059
1060 IRDA_DEBUG(3, "%s()\n", __func__);
1061
1062 IRDA_ASSERT(expiries != NULL, return;);
1063
1064 /* For each client - notify callback may touch client list */
1065 client = (irlmp_client_t *) hashbin_get_first(irlmp->clients);
1066 while (NULL != hashbin_find_next(irlmp->clients, (long) client, NULL,
1067 (void *) &client_next) ) {
1068
1069 /* Pass all entries to the listener */
1070 for(i = 0; i < number; i++) {
1071 /* Check if we should notify client */
1072 if ((client->expir_callback) &&
1073 (client->hint_mask.word &
1074 get_unaligned((__u16 *)expiries[i].hints)
1075 & 0x7f7f) )
1076 client->expir_callback(&(expiries[i]),
1077 EXPIRY_TIMEOUT,
1078 client->priv);
1079 }
1080
1081 /* Next client */
1082 client = client_next;
1083 }
1084}
1085
1086/*
1087 * Function irlmp_get_discovery_response ()
1088 *
1089 * Used by IrLAP to get the discovery info it needs when answering
1090 * discovery requests by other devices.
1091 */
1092discovery_t *irlmp_get_discovery_response(void)
1093{
1094 IRDA_DEBUG(4, "%s()\n", __func__);
1095
1096 IRDA_ASSERT(irlmp != NULL, return NULL;);
1097
1098 put_unaligned(irlmp->hints.word, (__u16 *)irlmp->discovery_rsp.data.hints);
1099
1100 /*
1101 * Set character set for device name (we use ASCII), and
1102 * copy device name. Remember to make room for a \0 at the
1103 * end
1104 */
1105 irlmp->discovery_rsp.data.charset = CS_ASCII;
1106
1107 strncpy(irlmp->discovery_rsp.data.info, sysctl_devname,
1108 NICKNAME_MAX_LEN);
1109 irlmp->discovery_rsp.name_len = strlen(irlmp->discovery_rsp.data.info);
1110
1111 return &irlmp->discovery_rsp;
1112}
1113
1114/*
1115 * Function irlmp_data_request (self, skb)
1116 *
1117 * Send some data to peer device
1118 *
1119 * Note on skb management :
1120 * After calling the lower layers of the IrDA stack, we always
1121 * kfree() the skb, which drop the reference count (and potentially
1122 * destroy it).
1123 * IrLMP and IrLAP may queue the packet, and in those cases will need
1124 * to use skb_get() to keep it around.
1125 * Jean II
1126 */
1127int irlmp_data_request(struct lsap_cb *self, struct sk_buff *userdata)
1128{
1129 int ret;
1130
1131 IRDA_ASSERT(self != NULL, return -1;);
1132 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
1133
1134 /* Make room for MUX header */
1135 IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER, return -1;);
1136 skb_push(userdata, LMP_HEADER);
1137
1138 ret = irlmp_do_lsap_event(self, LM_DATA_REQUEST, userdata);
1139
1140 /* Drop reference count - see irlap_data_request(). */
1141 dev_kfree_skb(userdata);
1142
1143 return ret;
1144}
1145EXPORT_SYMBOL(irlmp_data_request);
1146
1147/*
1148 * Function irlmp_data_indication (handle, skb)
1149 *
1150 * Got data from LAP layer so pass it up to upper layer
1151 *
1152 */
1153void irlmp_data_indication(struct lsap_cb *self, struct sk_buff *skb)
1154{
1155 /* Hide LMP header from layer above */
1156 skb_pull(skb, LMP_HEADER);
1157
1158 if (self->notify.data_indication) {
1159 /* Don't forget to refcount it - see irlap_driver_rcv(). */
1160 skb_get(skb);
1161 self->notify.data_indication(self->notify.instance, self, skb);
1162 }
1163}
1164
1165/*
1166 * Function irlmp_udata_request (self, skb)
1167 */
1168int irlmp_udata_request(struct lsap_cb *self, struct sk_buff *userdata)
1169{
1170 int ret;
1171
1172 IRDA_DEBUG(4, "%s()\n", __func__);
1173
1174 IRDA_ASSERT(userdata != NULL, return -1;);
1175
1176 /* Make room for MUX header */
1177 IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER, return -1;);
1178 skb_push(userdata, LMP_HEADER);
1179
1180 ret = irlmp_do_lsap_event(self, LM_UDATA_REQUEST, userdata);
1181
1182 /* Drop reference count - see irlap_data_request(). */
1183 dev_kfree_skb(userdata);
1184
1185 return ret;
1186}
1187
1188/*
1189 * Function irlmp_udata_indication (self, skb)
1190 *
1191 * Send unreliable data (but still within the connection)
1192 *
1193 */
1194void irlmp_udata_indication(struct lsap_cb *self, struct sk_buff *skb)
1195{
1196 IRDA_DEBUG(4, "%s()\n", __func__);
1197
1198 IRDA_ASSERT(self != NULL, return;);
1199 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
1200 IRDA_ASSERT(skb != NULL, return;);
1201
1202 /* Hide LMP header from layer above */
1203 skb_pull(skb, LMP_HEADER);
1204
1205 if (self->notify.udata_indication) {
1206 /* Don't forget to refcount it - see irlap_driver_rcv(). */
1207 skb_get(skb);
1208 self->notify.udata_indication(self->notify.instance, self,
1209 skb);
1210 }
1211}
1212
1213/*
1214 * Function irlmp_connless_data_request (self, skb)
1215 */
1216#ifdef CONFIG_IRDA_ULTRA
1217int irlmp_connless_data_request(struct lsap_cb *self, struct sk_buff *userdata,
1218 __u8 pid)
1219{
1220 struct sk_buff *clone_skb;
1221 struct lap_cb *lap;
1222
1223 IRDA_DEBUG(4, "%s()\n", __func__);
1224
1225 IRDA_ASSERT(userdata != NULL, return -1;);
1226
1227 /* Make room for MUX and PID header */
1228 IRDA_ASSERT(skb_headroom(userdata) >= LMP_HEADER+LMP_PID_HEADER,
1229 return -1;);
1230
1231 /* Insert protocol identifier */
1232 skb_push(userdata, LMP_PID_HEADER);
1233 if(self != NULL)
1234 userdata->data[0] = self->pid;
1235 else
1236 userdata->data[0] = pid;
1237
1238 /* Connectionless sockets must use 0x70 */
1239 skb_push(userdata, LMP_HEADER);
1240 userdata->data[0] = userdata->data[1] = LSAP_CONNLESS;
1241
1242 /* Try to send Connectionless packets out on all links */
1243 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
1244 while (lap != NULL) {
1245 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return -1;);
1246
1247 clone_skb = skb_clone(userdata, GFP_ATOMIC);
1248 if (!clone_skb) {
1249 dev_kfree_skb(userdata);
1250 return -ENOMEM;
1251 }
1252
1253 irlap_unitdata_request(lap->irlap, clone_skb);
1254 /* irlap_unitdata_request() don't increase refcount,
1255 * so no dev_kfree_skb() - Jean II */
1256
1257 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
1258 }
1259 dev_kfree_skb(userdata);
1260
1261 return 0;
1262}
1263#endif /* CONFIG_IRDA_ULTRA */
1264
1265/*
1266 * Function irlmp_connless_data_indication (self, skb)
1267 *
1268 * Receive unreliable data outside any connection. Mostly used by Ultra
1269 *
1270 */
1271#ifdef CONFIG_IRDA_ULTRA
1272void irlmp_connless_data_indication(struct lsap_cb *self, struct sk_buff *skb)
1273{
1274 IRDA_DEBUG(4, "%s()\n", __func__);
1275
1276 IRDA_ASSERT(self != NULL, return;);
1277 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
1278 IRDA_ASSERT(skb != NULL, return;);
1279
1280 /* Hide LMP and PID header from layer above */
1281 skb_pull(skb, LMP_HEADER+LMP_PID_HEADER);
1282
1283 if (self->notify.udata_indication) {
1284 /* Don't forget to refcount it - see irlap_driver_rcv(). */
1285 skb_get(skb);
1286 self->notify.udata_indication(self->notify.instance, self,
1287 skb);
1288 }
1289}
1290#endif /* CONFIG_IRDA_ULTRA */
1291
1292/*
1293 * Propagate status indication from LAP to LSAPs (via LMP)
1294 * This don't trigger any change of state in lap_cb, lmp_cb or lsap_cb,
1295 * and the event is stateless, therefore we can bypass both state machines
1296 * and send the event direct to the LSAP user.
1297 * Jean II
1298 */
1299void irlmp_status_indication(struct lap_cb *self,
1300 LINK_STATUS link, LOCK_STATUS lock)
1301{
1302 struct lsap_cb *next;
1303 struct lsap_cb *curr;
1304
1305 /* Send status_indication to all LSAPs using this link */
1306 curr = (struct lsap_cb *) hashbin_get_first( self->lsaps);
1307 while (NULL != hashbin_find_next(self->lsaps, (long) curr, NULL,
1308 (void *) &next) ) {
1309 IRDA_ASSERT(curr->magic == LMP_LSAP_MAGIC, return;);
1310 /*
1311 * Inform service user if he has requested it
1312 */
1313 if (curr->notify.status_indication != NULL)
1314 curr->notify.status_indication(curr->notify.instance,
1315 link, lock);
1316 else
1317 IRDA_DEBUG(2, "%s(), no handler\n", __func__);
1318
1319 curr = next;
1320 }
1321}
1322
1323/*
1324 * Receive flow control indication from LAP.
1325 * LAP want us to send it one more frame. We implement a simple round
1326 * robin scheduler between the active sockets so that we get a bit of
1327 * fairness. Note that the round robin is far from perfect, but it's
1328 * better than nothing.
1329 * We then poll the selected socket so that we can do synchronous
1330 * refilling of IrLAP (which allow to minimise the number of buffers).
1331 * Jean II
1332 */
1333void irlmp_flow_indication(struct lap_cb *self, LOCAL_FLOW flow)
1334{
1335 struct lsap_cb *next;
1336 struct lsap_cb *curr;
1337 int lsap_todo;
1338
1339 IRDA_ASSERT(self->magic == LMP_LAP_MAGIC, return;);
1340 IRDA_ASSERT(flow == FLOW_START, return;);
1341
1342 /* Get the number of lsap. That's the only safe way to know
1343 * that we have looped around... - Jean II */
1344 lsap_todo = HASHBIN_GET_SIZE(self->lsaps);
1345 IRDA_DEBUG(4, "%s() : %d lsaps to scan\n", __func__, lsap_todo);
1346
1347 /* Poll lsap in order until the queue is full or until we
1348 * tried them all.
1349 * Most often, the current LSAP will have something to send,
1350 * so we will go through this loop only once. - Jean II */
1351 while((lsap_todo--) &&
1352 (IRLAP_GET_TX_QUEUE_LEN(self->irlap) < LAP_HIGH_THRESHOLD)) {
1353 /* Try to find the next lsap we should poll. */
1354 next = self->flow_next;
1355 /* If we have no lsap, restart from first one */
1356 if(next == NULL)
1357 next = (struct lsap_cb *) hashbin_get_first(self->lsaps);
1358 /* Verify current one and find the next one */
1359 curr = hashbin_find_next(self->lsaps, (long) next, NULL,
1360 (void *) &self->flow_next);
1361 /* Uh-oh... Paranoia */
1362 if(curr == NULL)
1363 break;
1364 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));
1365
1366 /* Inform lsap user that it can send one more packet. */
1367 if (curr->notify.flow_indication != NULL)
1368 curr->notify.flow_indication(curr->notify.instance,
1369 curr, flow);
1370 else
1371 IRDA_DEBUG(1, "%s(), no handler\n", __func__);
1372 }
1373}
1374
1375#if 0
1376/*
1377 * Function irlmp_hint_to_service (hint)
1378 *
1379 * Returns a list of all servics contained in the given hint bits. This
1380 * function assumes that the hint bits have the size of two bytes only
1381 */
1382__u8 *irlmp_hint_to_service(__u8 *hint)
1383{
1384 __u8 *service;
1385 int i = 0;
1386
1387 /*
1388 * Allocate array to store services in. 16 entries should be safe
1389 * since we currently only support 2 hint bytes
1390 */
1391 service = kmalloc(16, GFP_ATOMIC);
1392 if (!service) {
1393 IRDA_DEBUG(1, "%s(), Unable to kmalloc!\n", __func__);
1394 return NULL;
1395 }
1396
1397 if (!hint[0]) {
1398 IRDA_DEBUG(1, "<None>\n");
1399 kfree(service);
1400 return NULL;
1401 }
1402 if (hint[0] & HINT_PNP)
1403 IRDA_DEBUG(1, "PnP Compatible ");
1404 if (hint[0] & HINT_PDA)
1405 IRDA_DEBUG(1, "PDA/Palmtop ");
1406 if (hint[0] & HINT_COMPUTER)
1407 IRDA_DEBUG(1, "Computer ");
1408 if (hint[0] & HINT_PRINTER) {
1409 IRDA_DEBUG(1, "Printer ");
1410 service[i++] = S_PRINTER;
1411 }
1412 if (hint[0] & HINT_MODEM)
1413 IRDA_DEBUG(1, "Modem ");
1414 if (hint[0] & HINT_FAX)
1415 IRDA_DEBUG(1, "Fax ");
1416 if (hint[0] & HINT_LAN) {
1417 IRDA_DEBUG(1, "LAN Access ");
1418 service[i++] = S_LAN;
1419 }
1420 /*
1421 * Test if extension byte exists. This byte will usually be
1422 * there, but this is not really required by the standard.
1423 * (IrLMP p. 29)
1424 */
1425 if (hint[0] & HINT_EXTENSION) {
1426 if (hint[1] & HINT_TELEPHONY) {
1427 IRDA_DEBUG(1, "Telephony ");
1428 service[i++] = S_TELEPHONY;
1429 } if (hint[1] & HINT_FILE_SERVER)
1430 IRDA_DEBUG(1, "File Server ");
1431
1432 if (hint[1] & HINT_COMM) {
1433 IRDA_DEBUG(1, "IrCOMM ");
1434 service[i++] = S_COMM;
1435 }
1436 if (hint[1] & HINT_OBEX) {
1437 IRDA_DEBUG(1, "IrOBEX ");
1438 service[i++] = S_OBEX;
1439 }
1440 }
1441 IRDA_DEBUG(1, "\n");
1442
1443 /* So that client can be notified about any discovery */
1444 service[i++] = S_ANY;
1445
1446 service[i] = S_END;
1447
1448 return service;
1449}
1450#endif
1451
1452static const __u16 service_hint_mapping[S_END][2] = {
1453 { HINT_PNP, 0 }, /* S_PNP */
1454 { HINT_PDA, 0 }, /* S_PDA */
1455 { HINT_COMPUTER, 0 }, /* S_COMPUTER */
1456 { HINT_PRINTER, 0 }, /* S_PRINTER */
1457 { HINT_MODEM, 0 }, /* S_MODEM */
1458 { HINT_FAX, 0 }, /* S_FAX */
1459 { HINT_LAN, 0 }, /* S_LAN */
1460 { HINT_EXTENSION, HINT_TELEPHONY }, /* S_TELEPHONY */
1461 { HINT_EXTENSION, HINT_COMM }, /* S_COMM */
1462 { HINT_EXTENSION, HINT_OBEX }, /* S_OBEX */
1463 { 0xFF, 0xFF }, /* S_ANY */
1464};
1465
1466/*
1467 * Function irlmp_service_to_hint (service)
1468 *
1469 * Converts a service type, to a hint bit
1470 *
1471 * Returns: a 16 bit hint value, with the service bit set
1472 */
1473__u16 irlmp_service_to_hint(int service)
1474{
1475 __u16_host_order hint;
1476
1477 hint.byte[0] = service_hint_mapping[service][0];
1478 hint.byte[1] = service_hint_mapping[service][1];
1479
1480 return hint.word;
1481}
1482EXPORT_SYMBOL(irlmp_service_to_hint);
1483
1484/*
1485 * Function irlmp_register_service (service)
1486 *
1487 * Register local service with IrLMP
1488 *
1489 */
1490void *irlmp_register_service(__u16 hints)
1491{
1492 irlmp_service_t *service;
1493
1494 IRDA_DEBUG(4, "%s(), hints = %04x\n", __func__, hints);
1495
1496 /* Make a new registration */
1497 service = kmalloc(sizeof(irlmp_service_t), GFP_ATOMIC);
1498 if (!service) {
1499 IRDA_DEBUG(1, "%s(), Unable to kmalloc!\n", __func__);
1500 return NULL;
1501 }
1502 service->hints.word = hints;
1503 hashbin_insert(irlmp->services, (irda_queue_t *) service,
1504 (long) service, NULL);
1505
1506 irlmp->hints.word |= hints;
1507
1508 return (void *)service;
1509}
1510EXPORT_SYMBOL(irlmp_register_service);
1511
1512/*
1513 * Function irlmp_unregister_service (handle)
1514 *
1515 * Unregister service with IrLMP.
1516 *
1517 * Returns: 0 on success, -1 on error
1518 */
1519int irlmp_unregister_service(void *handle)
1520{
1521 irlmp_service_t *service;
1522 unsigned long flags;
1523
1524 IRDA_DEBUG(4, "%s()\n", __func__);
1525
1526 if (!handle)
1527 return -1;
1528
1529 /* Caller may call with invalid handle (it's legal) - Jean II */
1530 service = hashbin_lock_find(irlmp->services, (long) handle, NULL);
1531 if (!service) {
1532 IRDA_DEBUG(1, "%s(), Unknown service!\n", __func__);
1533 return -1;
1534 }
1535
1536 hashbin_remove_this(irlmp->services, (irda_queue_t *) service);
1537 kfree(service);
1538
1539 /* Remove old hint bits */
1540 irlmp->hints.word = 0;
1541
1542 /* Refresh current hint bits */
1543 spin_lock_irqsave(&irlmp->services->hb_spinlock, flags);
1544 service = (irlmp_service_t *) hashbin_get_first(irlmp->services);
1545 while (service) {
1546 irlmp->hints.word |= service->hints.word;
1547
1548 service = (irlmp_service_t *)hashbin_get_next(irlmp->services);
1549 }
1550 spin_unlock_irqrestore(&irlmp->services->hb_spinlock, flags);
1551 return 0;
1552}
1553EXPORT_SYMBOL(irlmp_unregister_service);
1554
1555/*
1556 * Function irlmp_register_client (hint_mask, callback1, callback2)
1557 *
1558 * Register a local client with IrLMP
1559 * First callback is selective discovery (based on hints)
1560 * Second callback is for selective discovery expiries
1561 *
1562 * Returns: handle > 0 on success, 0 on error
1563 */
1564void *irlmp_register_client(__u16 hint_mask, DISCOVERY_CALLBACK1 disco_clb,
1565 DISCOVERY_CALLBACK2 expir_clb, void *priv)
1566{
1567 irlmp_client_t *client;
1568
1569 IRDA_DEBUG(1, "%s()\n", __func__);
1570 IRDA_ASSERT(irlmp != NULL, return NULL;);
1571
1572 /* Make a new registration */
1573 client = kmalloc(sizeof(irlmp_client_t), GFP_ATOMIC);
1574 if (!client) {
1575 IRDA_DEBUG( 1, "%s(), Unable to kmalloc!\n", __func__);
1576 return NULL;
1577 }
1578
1579 /* Register the details */
1580 client->hint_mask.word = hint_mask;
1581 client->disco_callback = disco_clb;
1582 client->expir_callback = expir_clb;
1583 client->priv = priv;
1584
1585 hashbin_insert(irlmp->clients, (irda_queue_t *) client,
1586 (long) client, NULL);
1587
1588 return (void *) client;
1589}
1590EXPORT_SYMBOL(irlmp_register_client);
1591
1592/*
1593 * Function irlmp_update_client (handle, hint_mask, callback1, callback2)
1594 *
1595 * Updates specified client (handle) with possibly new hint_mask and
1596 * callback
1597 *
1598 * Returns: 0 on success, -1 on error
1599 */
1600int irlmp_update_client(void *handle, __u16 hint_mask,
1601 DISCOVERY_CALLBACK1 disco_clb,
1602 DISCOVERY_CALLBACK2 expir_clb, void *priv)
1603{
1604 irlmp_client_t *client;
1605
1606 if (!handle)
1607 return -1;
1608
1609 client = hashbin_lock_find(irlmp->clients, (long) handle, NULL);
1610 if (!client) {
1611 IRDA_DEBUG(1, "%s(), Unknown client!\n", __func__);
1612 return -1;
1613 }
1614
1615 client->hint_mask.word = hint_mask;
1616 client->disco_callback = disco_clb;
1617 client->expir_callback = expir_clb;
1618 client->priv = priv;
1619
1620 return 0;
1621}
1622EXPORT_SYMBOL(irlmp_update_client);
1623
1624/*
1625 * Function irlmp_unregister_client (handle)
1626 *
1627 * Returns: 0 on success, -1 on error
1628 *
1629 */
1630int irlmp_unregister_client(void *handle)
1631{
1632 struct irlmp_client *client;
1633
1634 IRDA_DEBUG(4, "%s()\n", __func__);
1635
1636 if (!handle)
1637 return -1;
1638
1639 /* Caller may call with invalid handle (it's legal) - Jean II */
1640 client = hashbin_lock_find(irlmp->clients, (long) handle, NULL);
1641 if (!client) {
1642 IRDA_DEBUG(1, "%s(), Unknown client!\n", __func__);
1643 return -1;
1644 }
1645
1646 IRDA_DEBUG(4, "%s(), removing client!\n", __func__);
1647 hashbin_remove_this(irlmp->clients, (irda_queue_t *) client);
1648 kfree(client);
1649
1650 return 0;
1651}
1652EXPORT_SYMBOL(irlmp_unregister_client);
1653
1654/*
1655 * Function irlmp_slsap_inuse (slsap)
1656 *
1657 * Check if the given source LSAP selector is in use
1658 *
1659 * This function is clearly not very efficient. On the mitigating side, the
1660 * stack make sure that in 99% of the cases, we are called only once
1661 * for each socket allocation. We could probably keep a bitmap
1662 * of the allocated LSAP, but I'm not sure the complexity is worth it.
1663 * Jean II
1664 */
1665static int irlmp_slsap_inuse(__u8 slsap_sel)
1666{
1667 struct lsap_cb *self;
1668 struct lap_cb *lap;
1669 unsigned long flags;
1670
1671 IRDA_ASSERT(irlmp != NULL, return TRUE;);
1672 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return TRUE;);
1673 IRDA_ASSERT(slsap_sel != LSAP_ANY, return TRUE;);
1674
1675 IRDA_DEBUG(4, "%s()\n", __func__);
1676
1677#ifdef CONFIG_IRDA_ULTRA
1678 /* Accept all bindings to the connectionless LSAP */
1679 if (slsap_sel == LSAP_CONNLESS)
1680 return FALSE;
1681#endif /* CONFIG_IRDA_ULTRA */
1682
1683 /* Valid values are between 0 and 127 (0x0-0x6F) */
1684 if (slsap_sel > LSAP_MAX)
1685 return TRUE;
1686
1687 /*
1688 * Check if slsap is already in use. To do this we have to loop over
1689 * every IrLAP connection and check every LSAP associated with each
1690 * the connection.
1691 */
1692 spin_lock_irqsave_nested(&irlmp->links->hb_spinlock, flags,
1693 SINGLE_DEPTH_NESTING);
1694 lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
1695 while (lap != NULL) {
1696 IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, goto errlap;);
1697
1698 /* Careful for priority inversions here !
1699 * irlmp->links is never taken while another IrDA
1700 * spinlock is held, so we are safe. Jean II */
1701 spin_lock(&lap->lsaps->hb_spinlock);
1702
1703 /* For this IrLAP, check all the LSAPs */
1704 self = (struct lsap_cb *) hashbin_get_first(lap->lsaps);
1705 while (self != NULL) {
1706 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC,
1707 goto errlsap;);
1708
1709 if ((self->slsap_sel == slsap_sel)) {
1710 IRDA_DEBUG(4, "Source LSAP selector=%02x in use\n",
1711 self->slsap_sel);
1712 goto errlsap;
1713 }
1714 self = (struct lsap_cb*) hashbin_get_next(lap->lsaps);
1715 }
1716 spin_unlock(&lap->lsaps->hb_spinlock);
1717
1718 /* Next LAP */
1719 lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
1720 }
1721 spin_unlock_irqrestore(&irlmp->links->hb_spinlock, flags);
1722
1723 /*
1724 * Server sockets are typically waiting for connections and
1725 * therefore reside in the unconnected list. We don't want
1726 * to give out their LSAPs for obvious reasons...
1727 * Jean II
1728 */
1729 spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);
1730
1731 self = (struct lsap_cb *) hashbin_get_first(irlmp->unconnected_lsaps);
1732 while (self != NULL) {
1733 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, goto erruncon;);
1734 if ((self->slsap_sel == slsap_sel)) {
1735 IRDA_DEBUG(4, "Source LSAP selector=%02x in use (unconnected)\n",
1736 self->slsap_sel);
1737 goto erruncon;
1738 }
1739 self = (struct lsap_cb*) hashbin_get_next(irlmp->unconnected_lsaps);
1740 }
1741 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
1742
1743 return FALSE;
1744
1745 /* Error exit from within one of the two nested loops.
1746 * Make sure we release the right spinlock in the righ order.
1747 * Jean II */
1748errlsap:
1749 spin_unlock(&lap->lsaps->hb_spinlock);
1750IRDA_ASSERT_LABEL(errlap:)
1751 spin_unlock_irqrestore(&irlmp->links->hb_spinlock, flags);
1752 return TRUE;
1753
1754 /* Error exit from within the unconnected loop.
1755 * Just one spinlock to release... Jean II */
1756erruncon:
1757 spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
1758 return TRUE;
1759}
1760
1761/*
1762 * Function irlmp_find_free_slsap ()
1763 *
1764 * Find a free source LSAP to use. This function is called if the service
1765 * user has requested a source LSAP equal to LM_ANY
1766 */
1767static __u8 irlmp_find_free_slsap(void)
1768{
1769 __u8 lsap_sel;
1770 int wrapped = 0;
1771
1772 IRDA_ASSERT(irlmp != NULL, return -1;);
1773 IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return -1;);
1774
1775 /* Most users don't really care which LSAPs they are given,
1776 * and therefore we automatically give them a free LSAP.
1777 * This function try to find a suitable LSAP, i.e. which is
1778 * not in use and is within the acceptable range. Jean II */
1779
1780 do {
1781 /* Always increment to LSAP number before using it.
1782 * In theory, we could reuse the last LSAP number, as long
1783 * as it is no longer in use. Some IrDA stack do that.
1784 * However, the previous socket may be half closed, i.e.
1785 * we closed it, we think it's no longer in use, but the
1786 * other side did not receive our close and think it's
1787 * active and still send data on it.
1788 * This is similar to what is done with PIDs and TCP ports.
1789 * Also, this reduce the number of calls to irlmp_slsap_inuse()
1790 * which is an expensive function to call.
1791 * Jean II */
1792 irlmp->last_lsap_sel++;
1793
1794 /* Check if we need to wraparound (0x70-0x7f are reserved) */
1795 if (irlmp->last_lsap_sel > LSAP_MAX) {
1796 /* 0x00-0x10 are also reserved for well know ports */
1797 irlmp->last_lsap_sel = 0x10;
1798
1799 /* Make sure we terminate the loop */
1800 if (wrapped++) {
1801 IRDA_ERROR("%s: no more free LSAPs !\n",
1802 __func__);
1803 return 0;
1804 }
1805 }
1806
1807 /* If the LSAP is in use, try the next one.
1808 * Despite the autoincrement, we need to check if the lsap
1809 * is really in use or not, first because LSAP may be
1810 * directly allocated in irlmp_open_lsap(), and also because
1811 * we may wraparound on old sockets. Jean II */
1812 } while (irlmp_slsap_inuse(irlmp->last_lsap_sel));
1813
1814 /* Got it ! */
1815 lsap_sel = irlmp->last_lsap_sel;
1816 IRDA_DEBUG(4, "%s(), found free lsap_sel=%02x\n",
1817 __func__, lsap_sel);
1818
1819 return lsap_sel;
1820}
1821
1822/*
1823 * Function irlmp_convert_lap_reason (lap_reason)
1824 *
1825 * Converts IrLAP disconnect reason codes to IrLMP disconnect reason
1826 * codes
1827 *
1828 */
1829LM_REASON irlmp_convert_lap_reason( LAP_REASON lap_reason)
1830{
1831 int reason = LM_LAP_DISCONNECT;
1832
1833 switch (lap_reason) {
1834 case LAP_DISC_INDICATION: /* Received a disconnect request from peer */
1835 IRDA_DEBUG( 1, "%s(), LAP_DISC_INDICATION\n", __func__);
1836 reason = LM_USER_REQUEST;
1837 break;
1838 case LAP_NO_RESPONSE: /* To many retransmits without response */
1839 IRDA_DEBUG( 1, "%s(), LAP_NO_RESPONSE\n", __func__);
1840 reason = LM_LAP_DISCONNECT;
1841 break;
1842 case LAP_RESET_INDICATION:
1843 IRDA_DEBUG( 1, "%s(), LAP_RESET_INDICATION\n", __func__);
1844 reason = LM_LAP_RESET;
1845 break;
1846 case LAP_FOUND_NONE:
1847 case LAP_MEDIA_BUSY:
1848 case LAP_PRIMARY_CONFLICT:
1849 IRDA_DEBUG(1, "%s(), LAP_FOUND_NONE, LAP_MEDIA_BUSY or LAP_PRIMARY_CONFLICT\n", __func__);
1850 reason = LM_CONNECT_FAILURE;
1851 break;
1852 default:
1853 IRDA_DEBUG(1, "%s(), Unknown IrLAP disconnect reason %d!\n",
1854 __func__, lap_reason);
1855 reason = LM_LAP_DISCONNECT;
1856 break;
1857 }
1858
1859 return reason;
1860}
1861
1862#ifdef CONFIG_PROC_FS
1863
1864struct irlmp_iter_state {
1865 hashbin_t *hashbin;
1866};
1867
1868#define LSAP_START_TOKEN ((void *)1)
1869#define LINK_START_TOKEN ((void *)2)
1870
1871static void *irlmp_seq_hb_idx(struct irlmp_iter_state *iter, loff_t *off)
1872{
1873 void *element;
1874
1875 spin_lock_irq(&iter->hashbin->hb_spinlock);
1876 for (element = hashbin_get_first(iter->hashbin);
1877 element != NULL;
1878 element = hashbin_get_next(iter->hashbin)) {
1879 if (!off || *off-- == 0) {
1880 /* NB: hashbin left locked */
1881 return element;
1882 }
1883 }
1884 spin_unlock_irq(&iter->hashbin->hb_spinlock);
1885 iter->hashbin = NULL;
1886 return NULL;
1887}
1888
1889
1890static void *irlmp_seq_start(struct seq_file *seq, loff_t *pos)
1891{
1892 struct irlmp_iter_state *iter = seq->private;
1893 void *v;
1894 loff_t off = *pos;
1895
1896 iter->hashbin = NULL;
1897 if (off-- == 0)
1898 return LSAP_START_TOKEN;
1899
1900 iter->hashbin = irlmp->unconnected_lsaps;
1901 v = irlmp_seq_hb_idx(iter, &off);
1902 if (v)
1903 return v;
1904
1905 if (off-- == 0)
1906 return LINK_START_TOKEN;
1907
1908 iter->hashbin = irlmp->links;
1909 return irlmp_seq_hb_idx(iter, &off);
1910}
1911
1912static void *irlmp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1913{
1914 struct irlmp_iter_state *iter = seq->private;
1915
1916 ++*pos;
1917
1918 if (v == LSAP_START_TOKEN) { /* start of list of lsaps */
1919 iter->hashbin = irlmp->unconnected_lsaps;
1920 v = irlmp_seq_hb_idx(iter, NULL);
1921 return v ? v : LINK_START_TOKEN;
1922 }
1923
1924 if (v == LINK_START_TOKEN) { /* start of list of links */
1925 iter->hashbin = irlmp->links;
1926 return irlmp_seq_hb_idx(iter, NULL);
1927 }
1928
1929 v = hashbin_get_next(iter->hashbin);
1930
1931 if (v == NULL) { /* no more in this hash bin */
1932 spin_unlock_irq(&iter->hashbin->hb_spinlock);
1933
1934 if (iter->hashbin == irlmp->unconnected_lsaps)
1935 v = LINK_START_TOKEN;
1936
1937 iter->hashbin = NULL;
1938 }
1939 return v;
1940}
1941
1942static void irlmp_seq_stop(struct seq_file *seq, void *v)
1943{
1944 struct irlmp_iter_state *iter = seq->private;
1945
1946 if (iter->hashbin)
1947 spin_unlock_irq(&iter->hashbin->hb_spinlock);
1948}
1949
1950static int irlmp_seq_show(struct seq_file *seq, void *v)
1951{
1952 const struct irlmp_iter_state *iter = seq->private;
1953 struct lsap_cb *self = v;
1954
1955 if (v == LSAP_START_TOKEN)
1956 seq_puts(seq, "Unconnected LSAPs:\n");
1957 else if (v == LINK_START_TOKEN)
1958 seq_puts(seq, "\nRegistered Link Layers:\n");
1959 else if (iter->hashbin == irlmp->unconnected_lsaps) {
1960 self = v;
1961 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -EINVAL; );
1962 seq_printf(seq, "lsap state: %s, ",
1963 irlsap_state[ self->lsap_state]);
1964 seq_printf(seq,
1965 "slsap_sel: %#02x, dlsap_sel: %#02x, ",
1966 self->slsap_sel, self->dlsap_sel);
1967 seq_printf(seq, "(%s)", self->notify.name);
1968 seq_printf(seq, "\n");
1969 } else if (iter->hashbin == irlmp->links) {
1970 struct lap_cb *lap = v;
1971
1972 seq_printf(seq, "lap state: %s, ",
1973 irlmp_state[lap->lap_state]);
1974
1975 seq_printf(seq, "saddr: %#08x, daddr: %#08x, ",
1976 lap->saddr, lap->daddr);
1977 seq_printf(seq, "num lsaps: %d",
1978 HASHBIN_GET_SIZE(lap->lsaps));
1979 seq_printf(seq, "\n");
1980
1981 /* Careful for priority inversions here !
1982 * All other uses of attrib spinlock are independent of
1983 * the object spinlock, so we are safe. Jean II */
1984 spin_lock(&lap->lsaps->hb_spinlock);
1985
1986 seq_printf(seq, "\n Connected LSAPs:\n");
1987 for (self = (struct lsap_cb *) hashbin_get_first(lap->lsaps);
1988 self != NULL;
1989 self = (struct lsap_cb *)hashbin_get_next(lap->lsaps)) {
1990 IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC,
1991 goto outloop;);
1992 seq_printf(seq, " lsap state: %s, ",
1993 irlsap_state[ self->lsap_state]);
1994 seq_printf(seq,
1995 "slsap_sel: %#02x, dlsap_sel: %#02x, ",
1996 self->slsap_sel, self->dlsap_sel);
1997 seq_printf(seq, "(%s)", self->notify.name);
1998 seq_putc(seq, '\n');
1999
2000 }
2001 IRDA_ASSERT_LABEL(outloop:)
2002 spin_unlock(&lap->lsaps->hb_spinlock);
2003 seq_putc(seq, '\n');
2004 } else
2005 return -EINVAL;
2006
2007 return 0;
2008}
2009
2010static const struct seq_operations irlmp_seq_ops = {
2011 .start = irlmp_seq_start,
2012 .next = irlmp_seq_next,
2013 .stop = irlmp_seq_stop,
2014 .show = irlmp_seq_show,
2015};
2016
2017static int irlmp_seq_open(struct inode *inode, struct file *file)
2018{
2019 IRDA_ASSERT(irlmp != NULL, return -EINVAL;);
2020
2021 return seq_open_private(file, &irlmp_seq_ops,
2022 sizeof(struct irlmp_iter_state));
2023}
2024
2025const struct file_operations irlmp_seq_fops = {
2026 .owner = THIS_MODULE,
2027 .open = irlmp_seq_open,
2028 .read = seq_read,
2029 .llseek = seq_lseek,
2030 .release = seq_release_private,
2031};
2032
2033#endif /* PROC_FS */