forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathirlmp.c
1996 lines (1693 loc) · 53.4 KB
/
irlmp.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*********************************************************************
*
* Filename: irlmp.c
* Version: 1.0
* Description: IrDA Link Management Protocol (LMP) layer
* Status: Stable.
* Author: Dag Brattli <[email protected]>
* Created at: Sun Aug 17 20:54:32 1997
* Modified at: Wed Jan 5 11:26:03 2000
* Modified by: Dag Brattli <[email protected]>
*
* Copyright (c) 1998-2000 Dag Brattli <[email protected]>,
* All Rights Reserved.
* Copyright (c) 2000-2003 Jean Tourrilhes <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* Neither Dag Brattli nor University of Tromsø admit liability nor
* provide warranty for any of this software. This material is
* provided "AS-IS" and at no charge.
*
********************************************************************/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/random.h>
#include <linux/seq_file.h>
#include <net/irda/irda.h>
#include <net/irda/timer.h>
#include <net/irda/qos.h>
#include <net/irda/irlap.h>
#include <net/irda/iriap.h>
#include <net/irda/irlmp.h>
#include <net/irda/irlmp_frame.h>
#include <asm/unaligned.h>
static __u8 irlmp_find_free_slsap(void);
static int irlmp_slsap_inuse(__u8 slsap_sel);
/* Master structure */
struct irlmp_cb *irlmp = NULL;
/* These can be altered by the sysctl interface */
int sysctl_discovery = 0;
int sysctl_discovery_timeout = 3; /* 3 seconds by default */
int sysctl_discovery_slots = 6; /* 6 slots by default */
int sysctl_lap_keepalive_time = LM_IDLE_TIMEOUT * 1000 / HZ;
char sysctl_devname[65];
static const char *irlmp_reasons[] = {
"ERROR, NOT USED",
"LM_USER_REQUEST",
"LM_LAP_DISCONNECT",
"LM_CONNECT_FAILURE",
"LM_LAP_RESET",
"LM_INIT_DISCONNECT",
"ERROR, NOT USED",
"UNKNOWN",
};
const char *irlmp_reason_str(LM_REASON reason)
{
reason = min_t(size_t, reason, ARRAY_SIZE(irlmp_reasons) - 1);
return irlmp_reasons[reason];
}
/*
* Function irlmp_init (void)
*
* Create (allocate) the main IrLMP structure
*
*/
int __init irlmp_init(void)
{
/* Initialize the irlmp structure. */
irlmp = kzalloc( sizeof(struct irlmp_cb), GFP_KERNEL);
if (irlmp == NULL)
return -ENOMEM;
irlmp->magic = LMP_MAGIC;
irlmp->clients = hashbin_new(HB_LOCK);
irlmp->services = hashbin_new(HB_LOCK);
irlmp->links = hashbin_new(HB_LOCK);
irlmp->unconnected_lsaps = hashbin_new(HB_LOCK);
irlmp->cachelog = hashbin_new(HB_NOLOCK);
if ((irlmp->clients == NULL) ||
(irlmp->services == NULL) ||
(irlmp->links == NULL) ||
(irlmp->unconnected_lsaps == NULL) ||
(irlmp->cachelog == NULL)) {
return -ENOMEM;
}
spin_lock_init(&irlmp->cachelog->hb_spinlock);
irlmp->last_lsap_sel = 0x0f; /* Reserved 0x00-0x0f */
strcpy(sysctl_devname, "Linux");
init_timer(&irlmp->discovery_timer);
/* Do discovery every 3 seconds, conditionally */
if (sysctl_discovery)
irlmp_start_discovery_timer(irlmp,
sysctl_discovery_timeout*HZ);
return 0;
}
/*
* Function irlmp_cleanup (void)
*
* Remove IrLMP layer
*
*/
void irlmp_cleanup(void)
{
/* Check for main structure */
IRDA_ASSERT(irlmp != NULL, return;);
IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
del_timer(&irlmp->discovery_timer);
hashbin_delete(irlmp->links, (FREE_FUNC) kfree);
hashbin_delete(irlmp->unconnected_lsaps, (FREE_FUNC) kfree);
hashbin_delete(irlmp->clients, (FREE_FUNC) kfree);
hashbin_delete(irlmp->services, (FREE_FUNC) kfree);
hashbin_delete(irlmp->cachelog, (FREE_FUNC) kfree);
/* De-allocate main structure */
kfree(irlmp);
irlmp = NULL;
}
/*
* Function irlmp_open_lsap (slsap, notify)
*
* Register with IrLMP and create a local LSAP,
* returns handle to LSAP.
*/
struct lsap_cb *irlmp_open_lsap(__u8 slsap_sel, notify_t *notify, __u8 pid)
{
struct lsap_cb *self;
IRDA_ASSERT(notify != NULL, return NULL;);
IRDA_ASSERT(irlmp != NULL, return NULL;);
IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return NULL;);
IRDA_ASSERT(notify->instance != NULL, return NULL;);
/* Does the client care which Source LSAP selector it gets? */
if (slsap_sel == LSAP_ANY) {
slsap_sel = irlmp_find_free_slsap();
if (!slsap_sel)
return NULL;
} else if (irlmp_slsap_inuse(slsap_sel))
return NULL;
/* Allocate new instance of a LSAP connection */
self = kzalloc(sizeof(struct lsap_cb), GFP_ATOMIC);
if (self == NULL)
return NULL;
self->magic = LMP_LSAP_MAGIC;
self->slsap_sel = slsap_sel;
/* Fix connectionless LSAP's */
if (slsap_sel == LSAP_CONNLESS) {
#ifdef CONFIG_IRDA_ULTRA
self->dlsap_sel = LSAP_CONNLESS;
self->pid = pid;
#endif /* CONFIG_IRDA_ULTRA */
} else
self->dlsap_sel = LSAP_ANY;
/* self->connected = FALSE; -> already NULL via memset() */
init_timer(&self->watchdog_timer);
self->notify = *notify;
self->lsap_state = LSAP_DISCONNECTED;
/* Insert into queue of unconnected LSAPs */
hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
(long) self, NULL);
return self;
}
EXPORT_SYMBOL(irlmp_open_lsap);
/*
* Function __irlmp_close_lsap (self)
*
* Remove an instance of LSAP
*/
static void __irlmp_close_lsap(struct lsap_cb *self)
{
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
/*
* Set some of the variables to preset values
*/
self->magic = 0;
del_timer(&self->watchdog_timer); /* Important! */
if (self->conn_skb)
dev_kfree_skb(self->conn_skb);
kfree(self);
}
/*
* Function irlmp_close_lsap (self)
*
* Close and remove LSAP
*
*/
void irlmp_close_lsap(struct lsap_cb *self)
{
struct lap_cb *lap;
struct lsap_cb *lsap = NULL;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
/*
* Find out if we should remove this LSAP from a link or from the
* list of unconnected lsaps (not associated with a link)
*/
lap = self->lap;
if (lap) {
IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
/* We might close a LSAP before it has completed the
* connection setup. In those case, higher layers won't
* send a proper disconnect request. Harmless, except
* that we will forget to close LAP... - Jean II */
if(self->lsap_state != LSAP_DISCONNECTED) {
self->lsap_state = LSAP_DISCONNECTED;
irlmp_do_lap_event(self->lap,
LM_LAP_DISCONNECT_REQUEST, NULL);
}
/* Now, remove from the link */
lsap = hashbin_remove(lap->lsaps, (long) self, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
lap->cache.valid = FALSE;
#endif
}
self->lap = NULL;
/* Check if we found the LSAP! If not then try the unconnected lsaps */
if (!lsap) {
lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self,
NULL);
}
if (!lsap) {
pr_debug("%s(), Looks like somebody has removed me already!\n",
__func__);
return;
}
__irlmp_close_lsap(self);
}
EXPORT_SYMBOL(irlmp_close_lsap);
/*
* Function irlmp_register_irlap (saddr, notify)
*
* Register IrLAP layer with IrLMP. There is possible to have multiple
* instances of the IrLAP layer, each connected to different IrDA ports
*
*/
void irlmp_register_link(struct irlap_cb *irlap, __u32 saddr, notify_t *notify)
{
struct lap_cb *lap;
IRDA_ASSERT(irlmp != NULL, return;);
IRDA_ASSERT(irlmp->magic == LMP_MAGIC, return;);
IRDA_ASSERT(notify != NULL, return;);
/*
* Allocate new instance of a LSAP connection
*/
lap = kzalloc(sizeof(struct lap_cb), GFP_KERNEL);
if (lap == NULL)
return;
lap->irlap = irlap;
lap->magic = LMP_LAP_MAGIC;
lap->saddr = saddr;
lap->daddr = DEV_ADDR_ANY;
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
lap->cache.valid = FALSE;
#endif
lap->lsaps = hashbin_new(HB_LOCK);
if (lap->lsaps == NULL) {
net_warn_ratelimited("%s(), unable to kmalloc lsaps\n",
__func__);
kfree(lap);
return;
}
lap->lap_state = LAP_STANDBY;
init_timer(&lap->idle_timer);
/*
* Insert into queue of LMP links
*/
hashbin_insert(irlmp->links, (irda_queue_t *) lap, lap->saddr, NULL);
/*
* We set only this variable so IrLAP can tell us on which link the
* different events happened on
*/
irda_notify_init(notify);
notify->instance = lap;
}
/*
* Function irlmp_unregister_irlap (saddr)
*
* IrLAP layer has been removed!
*
*/
void irlmp_unregister_link(__u32 saddr)
{
struct lap_cb *link;
/* We must remove ourselves from the hashbin *first*. This ensure
* that no more LSAPs will be open on this link and no discovery
* will be triggered anymore. Jean II */
link = hashbin_remove(irlmp->links, saddr, NULL);
if (link) {
IRDA_ASSERT(link->magic == LMP_LAP_MAGIC, return;);
/* Kill all the LSAPs on this link. Jean II */
link->reason = LAP_DISC_INDICATION;
link->daddr = DEV_ADDR_ANY;
irlmp_do_lap_event(link, LM_LAP_DISCONNECT_INDICATION, NULL);
/* Remove all discoveries discovered at this link */
irlmp_expire_discoveries(irlmp->cachelog, link->saddr, TRUE);
/* Final cleanup */
del_timer(&link->idle_timer);
link->magic = 0;
hashbin_delete(link->lsaps, (FREE_FUNC) __irlmp_close_lsap);
kfree(link);
}
}
/*
* Function irlmp_connect_request (handle, dlsap, userdata)
*
* Connect with a peer LSAP
*
*/
int irlmp_connect_request(struct lsap_cb *self, __u8 dlsap_sel,
__u32 saddr, __u32 daddr,
struct qos_info *qos, struct sk_buff *userdata)
{
struct sk_buff *tx_skb = userdata;
struct lap_cb *lap;
struct lsap_cb *lsap;
int ret;
IRDA_ASSERT(self != NULL, return -EBADR;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -EBADR;);
pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x, saddr=%08x, daddr=%08x\n",
__func__, self->slsap_sel, dlsap_sel, saddr, daddr);
if (test_bit(0, &self->connected)) {
ret = -EISCONN;
goto err;
}
/* Client must supply destination device address */
if (!daddr) {
ret = -EINVAL;
goto err;
}
/* Any userdata? */
if (tx_skb == NULL) {
tx_skb = alloc_skb(LMP_MAX_HEADER, GFP_ATOMIC);
if (!tx_skb)
return -ENOMEM;
skb_reserve(tx_skb, LMP_MAX_HEADER);
}
/* Make room for MUX control header (3 bytes) */
IRDA_ASSERT(skb_headroom(tx_skb) >= LMP_CONTROL_HEADER, return -1;);
skb_push(tx_skb, LMP_CONTROL_HEADER);
self->dlsap_sel = dlsap_sel;
/*
* Find the link to where we should try to connect since there may
* be more than one IrDA port on this machine. If the client has
* passed us the saddr (and already knows which link to use), then
* we use that to find the link, if not then we have to look in the
* discovery log and check if any of the links has discovered a
* device with the given daddr
*/
if ((!saddr) || (saddr == DEV_ADDR_ANY)) {
discovery_t *discovery;
unsigned long flags;
spin_lock_irqsave(&irlmp->cachelog->hb_spinlock, flags);
if (daddr != DEV_ADDR_ANY)
discovery = hashbin_find(irlmp->cachelog, daddr, NULL);
else {
pr_debug("%s(), no daddr\n", __func__);
discovery = (discovery_t *)
hashbin_get_first(irlmp->cachelog);
}
if (discovery) {
saddr = discovery->data.saddr;
daddr = discovery->data.daddr;
}
spin_unlock_irqrestore(&irlmp->cachelog->hb_spinlock, flags);
}
lap = hashbin_lock_find(irlmp->links, saddr, NULL);
if (lap == NULL) {
pr_debug("%s(), Unable to find a usable link!\n", __func__);
ret = -EHOSTUNREACH;
goto err;
}
/* Check if LAP is disconnected or already connected */
if (lap->daddr == DEV_ADDR_ANY)
lap->daddr = daddr;
else if (lap->daddr != daddr) {
/* Check if some LSAPs are active on this LAP */
if (HASHBIN_GET_SIZE(lap->lsaps) == 0) {
/* No active connection, but LAP hasn't been
* disconnected yet (waiting for timeout in LAP).
* Maybe we could give LAP a bit of help in this case.
*/
pr_debug("%s(), sorry, but I'm waiting for LAP to timeout!\n",
__func__);
ret = -EAGAIN;
goto err;
}
/* LAP is already connected to a different node, and LAP
* can only talk to one node at a time */
pr_debug("%s(), sorry, but link is busy!\n", __func__);
ret = -EBUSY;
goto err;
}
self->lap = lap;
/*
* Remove LSAP from list of unconnected LSAPs and insert it into the
* list of connected LSAPs for the particular link
*/
lsap = hashbin_remove(irlmp->unconnected_lsaps, (long) self, NULL);
IRDA_ASSERT(lsap != NULL, return -1;);
IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
IRDA_ASSERT(lsap->lap != NULL, return -1;);
IRDA_ASSERT(lsap->lap->magic == LMP_LAP_MAGIC, return -1;);
hashbin_insert(self->lap->lsaps, (irda_queue_t *) self, (long) self,
NULL);
set_bit(0, &self->connected); /* TRUE */
/*
* User supplied qos specifications?
*/
if (qos)
self->qos = *qos;
irlmp_do_lsap_event(self, LM_CONNECT_REQUEST, tx_skb);
/* Drop reference count - see irlap_data_request(). */
dev_kfree_skb(tx_skb);
return 0;
err:
/* Cleanup */
if(tx_skb)
dev_kfree_skb(tx_skb);
return ret;
}
EXPORT_SYMBOL(irlmp_connect_request);
/*
* Function irlmp_connect_indication (self)
*
* Incoming connection
*
*/
void irlmp_connect_indication(struct lsap_cb *self, struct sk_buff *skb)
{
int max_seg_size;
int lap_header_size;
int max_header_size;
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
IRDA_ASSERT(skb != NULL, return;);
IRDA_ASSERT(self->lap != NULL, return;);
pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
__func__, self->slsap_sel, self->dlsap_sel);
/* Note : self->lap is set in irlmp_link_data_indication(),
* (case CONNECT_CMD:) because we have no way to set it here.
* Similarly, self->dlsap_sel is usually set in irlmp_find_lsap().
* Jean II */
self->qos = *self->lap->qos;
max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
max_header_size = LMP_HEADER + lap_header_size;
/* Hide LMP_CONTROL_HEADER header from layer above */
skb_pull(skb, LMP_CONTROL_HEADER);
if (self->notify.connect_indication) {
/* Don't forget to refcount it - see irlap_driver_rcv(). */
skb_get(skb);
self->notify.connect_indication(self->notify.instance, self,
&self->qos, max_seg_size,
max_header_size, skb);
}
}
/*
* Function irlmp_connect_response (handle, userdata)
*
* Service user is accepting connection
*
*/
int irlmp_connect_response(struct lsap_cb *self, struct sk_buff *userdata)
{
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
IRDA_ASSERT(userdata != NULL, return -1;);
/* We set the connected bit and move the lsap to the connected list
* in the state machine itself. Jean II */
pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
__func__, self->slsap_sel, self->dlsap_sel);
/* Make room for MUX control header (3 bytes) */
IRDA_ASSERT(skb_headroom(userdata) >= LMP_CONTROL_HEADER, return -1;);
skb_push(userdata, LMP_CONTROL_HEADER);
irlmp_do_lsap_event(self, LM_CONNECT_RESPONSE, userdata);
/* Drop reference count - see irlap_data_request(). */
dev_kfree_skb(userdata);
return 0;
}
EXPORT_SYMBOL(irlmp_connect_response);
/*
* Function irlmp_connect_confirm (handle, skb)
*
* LSAP connection confirmed peer device!
*/
void irlmp_connect_confirm(struct lsap_cb *self, struct sk_buff *skb)
{
int max_header_size;
int lap_header_size;
int max_seg_size;
IRDA_ASSERT(skb != NULL, return;);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
IRDA_ASSERT(self->lap != NULL, return;);
self->qos = *self->lap->qos;
max_seg_size = self->lap->qos->data_size.value-LMP_HEADER;
lap_header_size = IRLAP_GET_HEADER_SIZE(self->lap->irlap);
max_header_size = LMP_HEADER + lap_header_size;
pr_debug("%s(), max_header_size=%d\n",
__func__, max_header_size);
/* Hide LMP_CONTROL_HEADER header from layer above */
skb_pull(skb, LMP_CONTROL_HEADER);
if (self->notify.connect_confirm) {
/* Don't forget to refcount it - see irlap_driver_rcv() */
skb_get(skb);
self->notify.connect_confirm(self->notify.instance, self,
&self->qos, max_seg_size,
max_header_size, skb);
}
}
/*
* Function irlmp_dup (orig, instance)
*
* Duplicate LSAP, can be used by servers to confirm a connection on a
* new LSAP so it can keep listening on the old one.
*
*/
struct lsap_cb *irlmp_dup(struct lsap_cb *orig, void *instance)
{
struct lsap_cb *new;
unsigned long flags;
spin_lock_irqsave(&irlmp->unconnected_lsaps->hb_spinlock, flags);
/* Only allowed to duplicate unconnected LSAP's, and only LSAPs
* that have received a connect indication. Jean II */
if ((!hashbin_find(irlmp->unconnected_lsaps, (long) orig, NULL)) ||
(orig->lap == NULL)) {
pr_debug("%s(), invalid LSAP (wrong state)\n",
__func__);
spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
flags);
return NULL;
}
/* Allocate a new instance */
new = kmemdup(orig, sizeof(*new), GFP_ATOMIC);
if (!new) {
pr_debug("%s(), unable to kmalloc\n", __func__);
spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock,
flags);
return NULL;
}
/* new->lap = orig->lap; => done in the memcpy() */
/* new->slsap_sel = orig->slsap_sel; => done in the memcpy() */
new->conn_skb = NULL;
spin_unlock_irqrestore(&irlmp->unconnected_lsaps->hb_spinlock, flags);
/* Not everything is the same */
new->notify.instance = instance;
init_timer(&new->watchdog_timer);
hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) new,
(long) new, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
/* Make sure that we invalidate the LSAP cache */
new->lap->cache.valid = FALSE;
#endif /* CONFIG_IRDA_CACHE_LAST_LSAP */
return new;
}
/*
* Function irlmp_disconnect_request (handle, userdata)
*
* The service user is requesting disconnection, this will not remove the
* LSAP, but only mark it as disconnected
*/
int irlmp_disconnect_request(struct lsap_cb *self, struct sk_buff *userdata)
{
struct lsap_cb *lsap;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return -1;);
IRDA_ASSERT(userdata != NULL, return -1;);
/* Already disconnected ?
* There is a race condition between irlmp_disconnect_indication()
* and us that might mess up the hashbins below. This fixes it.
* Jean II */
if (! test_and_clear_bit(0, &self->connected)) {
pr_debug("%s(), already disconnected!\n", __func__);
dev_kfree_skb(userdata);
return -1;
}
skb_push(userdata, LMP_CONTROL_HEADER);
/*
* Do the event before the other stuff since we must know
* which lap layer that the frame should be transmitted on
*/
irlmp_do_lsap_event(self, LM_DISCONNECT_REQUEST, userdata);
/* Drop reference count - see irlap_data_request(). */
dev_kfree_skb(userdata);
/*
* Remove LSAP from list of connected LSAPs for the particular link
* and insert it into the list of unconnected LSAPs
*/
IRDA_ASSERT(self->lap != NULL, return -1;);
IRDA_ASSERT(self->lap->magic == LMP_LAP_MAGIC, return -1;);
IRDA_ASSERT(self->lap->lsaps != NULL, return -1;);
lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
self->lap->cache.valid = FALSE;
#endif
IRDA_ASSERT(lsap != NULL, return -1;);
IRDA_ASSERT(lsap->magic == LMP_LSAP_MAGIC, return -1;);
IRDA_ASSERT(lsap == self, return -1;);
hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) self,
(long) self, NULL);
/* Reset some values */
self->dlsap_sel = LSAP_ANY;
self->lap = NULL;
return 0;
}
EXPORT_SYMBOL(irlmp_disconnect_request);
/*
* Function irlmp_disconnect_indication (reason, userdata)
*
* LSAP is being closed!
*/
void irlmp_disconnect_indication(struct lsap_cb *self, LM_REASON reason,
struct sk_buff *skb)
{
struct lsap_cb *lsap;
pr_debug("%s(), reason=%s [%d]\n", __func__,
irlmp_reason_str(reason), reason);
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == LMP_LSAP_MAGIC, return;);
pr_debug("%s(), slsap_sel=%02x, dlsap_sel=%02x\n",
__func__, self->slsap_sel, self->dlsap_sel);
/* Already disconnected ?
* There is a race condition between irlmp_disconnect_request()
* and us that might mess up the hashbins below. This fixes it.
* Jean II */
if (! test_and_clear_bit(0, &self->connected)) {
pr_debug("%s(), already disconnected!\n", __func__);
return;
}
/*
* Remove association between this LSAP and the link it used
*/
IRDA_ASSERT(self->lap != NULL, return;);
IRDA_ASSERT(self->lap->lsaps != NULL, return;);
lsap = hashbin_remove(self->lap->lsaps, (long) self, NULL);
#ifdef CONFIG_IRDA_CACHE_LAST_LSAP
self->lap->cache.valid = FALSE;
#endif
IRDA_ASSERT(lsap != NULL, return;);
IRDA_ASSERT(lsap == self, return;);
hashbin_insert(irlmp->unconnected_lsaps, (irda_queue_t *) lsap,
(long) lsap, NULL);
self->dlsap_sel = LSAP_ANY;
self->lap = NULL;
/*
* Inform service user
*/
if (self->notify.disconnect_indication) {
/* Don't forget to refcount it - see irlap_driver_rcv(). */
if(skb)
skb_get(skb);
self->notify.disconnect_indication(self->notify.instance,
self, reason, skb);
} else {
pr_debug("%s(), no handler\n", __func__);
}
}
/*
* Function irlmp_do_expiry (void)
*
* Do a cleanup of the discovery log (remove old entries)
*
* Note : separate from irlmp_do_discovery() so that we can handle
* passive discovery properly.
*/
void irlmp_do_expiry(void)
{
struct lap_cb *lap;
/*
* Expire discovery on all links which are *not* connected.
* On links which are connected, we can't do discovery
* anymore and can't refresh the log, so we freeze the
* discovery log to keep info about the device we are
* connected to.
* This info is mandatory if we want irlmp_connect_request()
* to work properly. - Jean II
*/
lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
while (lap != NULL) {
IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
if (lap->lap_state == LAP_STANDBY) {
/* Expire discoveries discovered on this link */
irlmp_expire_discoveries(irlmp->cachelog, lap->saddr,
FALSE);
}
lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
}
}
/*
* Function irlmp_do_discovery (nslots)
*
* Do some discovery on all links
*
* Note : log expiry is done above.
*/
void irlmp_do_discovery(int nslots)
{
struct lap_cb *lap;
__u16 *data_hintsp;
/* Make sure the value is sane */
if ((nslots != 1) && (nslots != 6) && (nslots != 8) && (nslots != 16)){
net_warn_ratelimited("%s: invalid value for number of slots!\n",
__func__);
nslots = sysctl_discovery_slots = 8;
}
/* Construct new discovery info to be used by IrLAP, */
data_hintsp = (__u16 *) irlmp->discovery_cmd.data.hints;
put_unaligned(irlmp->hints.word, data_hintsp);
/*
* Set character set for device name (we use ASCII), and
* copy device name. Remember to make room for a \0 at the
* end
*/
irlmp->discovery_cmd.data.charset = CS_ASCII;
strncpy(irlmp->discovery_cmd.data.info, sysctl_devname,
NICKNAME_MAX_LEN);
irlmp->discovery_cmd.name_len = strlen(irlmp->discovery_cmd.data.info);
irlmp->discovery_cmd.nslots = nslots;
/*
* Try to send discovery packets on all links
*/
lap = (struct lap_cb *) hashbin_get_first(irlmp->links);
while (lap != NULL) {
IRDA_ASSERT(lap->magic == LMP_LAP_MAGIC, return;);
if (lap->lap_state == LAP_STANDBY) {
/* Try to discover */
irlmp_do_lap_event(lap, LM_LAP_DISCOVERY_REQUEST,
NULL);
}
lap = (struct lap_cb *) hashbin_get_next(irlmp->links);
}
}
/*
* Function irlmp_discovery_request (nslots)
*
* Do a discovery of devices in front of the computer
*
* If the caller has registered a client discovery callback, this
* allow him to receive the full content of the discovery log through
* this callback (as normally he will receive only new discoveries).
*/
void irlmp_discovery_request(int nslots)
{
/* Return current cached discovery log (in full) */
irlmp_discovery_confirm(irlmp->cachelog, DISCOVERY_LOG);
/*
* Start a single discovery operation if discovery is not already
* running
*/
if (!sysctl_discovery) {
/* Check if user wants to override the default */
if (nslots == DISCOVERY_DEFAULT_SLOTS)
nslots = sysctl_discovery_slots;
irlmp_do_discovery(nslots);
/* Note : we never do expiry here. Expiry will run on the
* discovery timer regardless of the state of sysctl_discovery
* Jean II */
}
}
EXPORT_SYMBOL(irlmp_discovery_request);
/*
* Function irlmp_get_discoveries (pn, mask, slots)
*
* Return the current discovery log
*
* If discovery is not enabled, you should call this function again
* after 1 or 2 seconds (i.e. after discovery has been done).
*/
struct irda_device_info *irlmp_get_discoveries(int *pn, __u16 mask, int nslots)
{
/* If discovery is not enabled, it's likely that the discovery log
* will be empty. So, we trigger a single discovery, so that next
* time the user call us there might be some results in the log.
* Jean II
*/
if (!sysctl_discovery) {
/* Check if user wants to override the default */
if (nslots == DISCOVERY_DEFAULT_SLOTS)
nslots = sysctl_discovery_slots;
/* Start discovery - will complete sometime later */
irlmp_do_discovery(nslots);
/* Note : we never do expiry here. Expiry will run on the
* discovery timer regardless of the state of sysctl_discovery
* Jean II */
}
/* Return current cached discovery log */
return irlmp_copy_discoveries(irlmp->cachelog, pn, mask, TRUE);
}
EXPORT_SYMBOL(irlmp_get_discoveries);
/*
* Function irlmp_notify_client (log)
*
* Notify all about discovered devices
*
* Clients registered with IrLMP are :
* o IrComm
* o IrLAN
* o Any socket (in any state - ouch, that may be a lot !)
* The client may have defined a callback to be notified in case of
* partial/selective discovery based on the hints that it passed to IrLMP.
*/
static inline void
irlmp_notify_client(irlmp_client_t *client,
hashbin_t *log, DISCOVERY_MODE mode)
{
discinfo_t *discoveries; /* Copy of the discovery log */
int number; /* Number of nodes in the log */
int i;
/* Check if client wants or not partial/selective log (optimisation) */
if (!client->disco_callback)
return;
/*
* Locking notes :
* the old code was manipulating the log directly, which was
* very racy. Now, we use copy_discoveries, that protects
* itself while dumping the log for us.
* The overhead of the copy is compensated by the fact that
* we only pass new discoveries in normal mode and don't
* pass the same old entry every 3s to the caller as we used
* to do (virtual function calling is expensive).
* Jean II
*/
/*
* Now, check all discovered devices (if any), and notify client
* only about the services that the client is interested in
* We also notify only about the new devices unless the caller
* explicitly request a dump of the log. Jean II
*/
discoveries = irlmp_copy_discoveries(log, &number,
client->hint_mask.word,
(mode == DISCOVERY_LOG));
/* Check if the we got some results */
if (discoveries == NULL)
return; /* No nodes discovered */
/* Pass all entries to the listener */
for(i = 0; i < number; i++)
client->disco_callback(&(discoveries[i]), mode, client->priv);
/* Free up our buffer */
kfree(discoveries);
}
/*
* Function irlmp_discovery_confirm ( self, log)
*