forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 17
/
l2cap_core.c
3989 lines (3102 loc) · 89.9 KB
/
l2cap_core.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
/*
BlueZ - Bluetooth protocol stack for Linux
Copyright (C) 2000-2001 Qualcomm Incorporated
Copyright (C) 2009-2010 Gustavo F. Padovan <[email protected]>
Copyright (C) 2010 Google Inc.
Written 2000,2001 by Maxim Krasnyansky <[email protected]>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation;
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
SOFTWARE IS DISCLAIMED.
*/
/* Bluetooth L2CAP core. */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/crc16.h>
#include <net/sock.h>
#include <asm/system.h>
#include <asm/unaligned.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>
#define VERSION "2.15"
int disable_ertm;
static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
static u8 l2cap_fixed_chan[8] = { 0x02, };
static struct workqueue_struct *_busy_wq;
struct bt_sock_list l2cap_sk_list = {
.lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
};
static void l2cap_busy_work(struct work_struct *work);
static void l2cap_sock_close(struct sock *sk);
static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
u8 code, u8 ident, u16 dlen, void *data);
static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
/* ---- L2CAP timers ---- */
void l2cap_sock_set_timer(struct sock *sk, long timeout)
{
BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
}
void l2cap_sock_clear_timer(struct sock *sk)
{
BT_DBG("sock %p state %d", sk, sk->sk_state);
sk_stop_timer(sk, &sk->sk_timer);
}
/* ---- L2CAP channels ---- */
static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
{
struct sock *s;
for (s = l->head; s; s = l2cap_pi(s)->next_c) {
if (l2cap_pi(s)->dcid == cid)
break;
}
return s;
}
static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
{
struct sock *s;
for (s = l->head; s; s = l2cap_pi(s)->next_c) {
if (l2cap_pi(s)->scid == cid)
break;
}
return s;
}
/* Find channel with given SCID.
* Returns locked socket */
static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
{
struct sock *s;
read_lock(&l->lock);
s = __l2cap_get_chan_by_scid(l, cid);
if (s)
bh_lock_sock(s);
read_unlock(&l->lock);
return s;
}
static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
{
struct sock *s;
for (s = l->head; s; s = l2cap_pi(s)->next_c) {
if (l2cap_pi(s)->ident == ident)
break;
}
return s;
}
static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
{
struct sock *s;
read_lock(&l->lock);
s = __l2cap_get_chan_by_ident(l, ident);
if (s)
bh_lock_sock(s);
read_unlock(&l->lock);
return s;
}
static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
{
u16 cid = L2CAP_CID_DYN_START;
for (; cid < L2CAP_CID_DYN_END; cid++) {
if (!__l2cap_get_chan_by_scid(l, cid))
return cid;
}
return 0;
}
static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
{
sock_hold(sk);
if (l->head)
l2cap_pi(l->head)->prev_c = sk;
l2cap_pi(sk)->next_c = l->head;
l2cap_pi(sk)->prev_c = NULL;
l->head = sk;
}
static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
{
struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
write_lock_bh(&l->lock);
if (sk == l->head)
l->head = next;
if (next)
l2cap_pi(next)->prev_c = prev;
if (prev)
l2cap_pi(prev)->next_c = next;
write_unlock_bh(&l->lock);
__sock_put(sk);
}
static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
{
struct l2cap_chan_list *l = &conn->chan_list;
BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
conn->disc_reason = 0x13;
l2cap_pi(sk)->conn = conn;
if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) {
/* Alloc CID for connection-oriented socket */
l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
} else if (sk->sk_type == SOCK_DGRAM) {
/* Connectionless socket */
l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
} else {
/* Raw socket can send/recv signalling messages only */
l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
}
__l2cap_chan_link(l, sk);
if (parent)
bt_accept_enqueue(parent, sk);
}
/* Delete channel.
* Must be called on the locked socket. */
static void l2cap_chan_del(struct sock *sk, int err)
{
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
struct sock *parent = bt_sk(sk)->parent;
l2cap_sock_clear_timer(sk);
BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
if (conn) {
/* Unlink from channel list */
l2cap_chan_unlink(&conn->chan_list, sk);
l2cap_pi(sk)->conn = NULL;
hci_conn_put(conn->hcon);
}
sk->sk_state = BT_CLOSED;
sock_set_flag(sk, SOCK_ZAPPED);
if (err)
sk->sk_err = err;
if (parent) {
bt_accept_unlink(sk);
parent->sk_data_ready(parent, 0);
} else
sk->sk_state_change(sk);
skb_queue_purge(TX_QUEUE(sk));
if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
struct srej_list *l, *tmp;
del_timer(&l2cap_pi(sk)->retrans_timer);
del_timer(&l2cap_pi(sk)->monitor_timer);
del_timer(&l2cap_pi(sk)->ack_timer);
skb_queue_purge(SREJ_QUEUE(sk));
skb_queue_purge(BUSY_QUEUE(sk));
list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
list_del(&l->list);
kfree(l);
}
}
}
static inline u8 l2cap_get_auth_type(struct sock *sk)
{
if (sk->sk_type == SOCK_RAW) {
switch (l2cap_pi(sk)->sec_level) {
case BT_SECURITY_HIGH:
return HCI_AT_DEDICATED_BONDING_MITM;
case BT_SECURITY_MEDIUM:
return HCI_AT_DEDICATED_BONDING;
default:
return HCI_AT_NO_BONDING;
}
} else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
return HCI_AT_NO_BONDING_MITM;
else
return HCI_AT_NO_BONDING;
} else {
switch (l2cap_pi(sk)->sec_level) {
case BT_SECURITY_HIGH:
return HCI_AT_GENERAL_BONDING_MITM;
case BT_SECURITY_MEDIUM:
return HCI_AT_GENERAL_BONDING;
default:
return HCI_AT_NO_BONDING;
}
}
}
/* Service level security */
static inline int l2cap_check_security(struct sock *sk)
{
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
__u8 auth_type;
auth_type = l2cap_get_auth_type(sk);
return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
auth_type);
}
u8 l2cap_get_ident(struct l2cap_conn *conn)
{
u8 id;
/* Get next available identificator.
* 1 - 128 are used by kernel.
* 129 - 199 are reserved.
* 200 - 254 are used by utilities like l2ping, etc.
*/
spin_lock_bh(&conn->lock);
if (++conn->tx_ident > 128)
conn->tx_ident = 1;
id = conn->tx_ident;
spin_unlock_bh(&conn->lock);
return id;
}
void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
{
struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
u8 flags;
BT_DBG("code 0x%2.2x", code);
if (!skb)
return;
if (lmp_no_flush_capable(conn->hcon->hdev))
flags = ACL_START_NO_FLUSH;
else
flags = ACL_START;
hci_send_acl(conn->hcon, skb, flags);
}
static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
{
struct sk_buff *skb;
struct l2cap_hdr *lh;
struct l2cap_conn *conn = pi->conn;
struct sock *sk = (struct sock *)pi;
int count, hlen = L2CAP_HDR_SIZE + 2;
u8 flags;
if (sk->sk_state != BT_CONNECTED)
return;
if (pi->fcs == L2CAP_FCS_CRC16)
hlen += 2;
BT_DBG("pi %p, control 0x%2.2x", pi, control);
count = min_t(unsigned int, conn->mtu, hlen);
control |= L2CAP_CTRL_FRAME_TYPE;
if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
control |= L2CAP_CTRL_FINAL;
pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
}
if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
control |= L2CAP_CTRL_POLL;
pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
}
skb = bt_skb_alloc(count, GFP_ATOMIC);
if (!skb)
return;
lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
lh->cid = cpu_to_le16(pi->dcid);
put_unaligned_le16(control, skb_put(skb, 2));
if (pi->fcs == L2CAP_FCS_CRC16) {
u16 fcs = crc16(0, (u8 *)lh, count - 2);
put_unaligned_le16(fcs, skb_put(skb, 2));
}
if (lmp_no_flush_capable(conn->hcon->hdev))
flags = ACL_START_NO_FLUSH;
else
flags = ACL_START;
hci_send_acl(pi->conn->hcon, skb, flags);
}
static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
{
if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
control |= L2CAP_SUPER_RCV_NOT_READY;
pi->conn_state |= L2CAP_CONN_RNR_SENT;
} else
control |= L2CAP_SUPER_RCV_READY;
control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
l2cap_send_sframe(pi, control);
}
static inline int __l2cap_no_conn_pending(struct sock *sk)
{
return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND);
}
static void l2cap_do_start(struct sock *sk)
{
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
return;
if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) {
struct l2cap_conn_req req;
req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
req.psm = l2cap_pi(sk)->psm;
l2cap_pi(sk)->ident = l2cap_get_ident(conn);
l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
L2CAP_CONN_REQ, sizeof(req), &req);
}
} else {
struct l2cap_info_req req;
req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
conn->info_ident = l2cap_get_ident(conn);
mod_timer(&conn->info_timer, jiffies +
msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
l2cap_send_cmd(conn, conn->info_ident,
L2CAP_INFO_REQ, sizeof(req), &req);
}
}
static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
{
u32 local_feat_mask = l2cap_feat_mask;
if (!disable_ertm)
local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
switch (mode) {
case L2CAP_MODE_ERTM:
return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
case L2CAP_MODE_STREAMING:
return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
default:
return 0x00;
}
}
static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err)
{
struct l2cap_disconn_req req;
if (!conn)
return;
skb_queue_purge(TX_QUEUE(sk));
if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
del_timer(&l2cap_pi(sk)->retrans_timer);
del_timer(&l2cap_pi(sk)->monitor_timer);
del_timer(&l2cap_pi(sk)->ack_timer);
}
req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
l2cap_send_cmd(conn, l2cap_get_ident(conn),
L2CAP_DISCONN_REQ, sizeof(req), &req);
sk->sk_state = BT_DISCONN;
sk->sk_err = err;
}
/* ---- L2CAP connections ---- */
static void l2cap_conn_start(struct l2cap_conn *conn)
{
struct l2cap_chan_list *l = &conn->chan_list;
struct sock_del_list del, *tmp1, *tmp2;
struct sock *sk;
BT_DBG("conn %p", conn);
INIT_LIST_HEAD(&del.list);
read_lock(&l->lock);
for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
bh_lock_sock(sk);
if (sk->sk_type != SOCK_SEQPACKET &&
sk->sk_type != SOCK_STREAM) {
bh_unlock_sock(sk);
continue;
}
if (sk->sk_state == BT_CONNECT) {
struct l2cap_conn_req req;
if (!l2cap_check_security(sk) ||
!__l2cap_no_conn_pending(sk)) {
bh_unlock_sock(sk);
continue;
}
if (!l2cap_mode_supported(l2cap_pi(sk)->mode,
conn->feat_mask)
&& l2cap_pi(sk)->conf_state &
L2CAP_CONF_STATE2_DEVICE) {
tmp1 = kzalloc(sizeof(struct sock_del_list),
GFP_ATOMIC);
tmp1->sk = sk;
list_add_tail(&tmp1->list, &del.list);
bh_unlock_sock(sk);
continue;
}
req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
req.psm = l2cap_pi(sk)->psm;
l2cap_pi(sk)->ident = l2cap_get_ident(conn);
l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
L2CAP_CONN_REQ, sizeof(req), &req);
} else if (sk->sk_state == BT_CONNECT2) {
struct l2cap_conn_rsp rsp;
char buf[128];
rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
if (l2cap_check_security(sk)) {
if (bt_sk(sk)->defer_setup) {
struct sock *parent = bt_sk(sk)->parent;
rsp.result = cpu_to_le16(L2CAP_CR_PEND);
rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
parent->sk_data_ready(parent, 0);
} else {
sk->sk_state = BT_CONFIG;
rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
}
} else {
rsp.result = cpu_to_le16(L2CAP_CR_PEND);
rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
}
l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
L2CAP_CONN_RSP, sizeof(rsp), &rsp);
if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT ||
rsp.result != L2CAP_CR_SUCCESS) {
bh_unlock_sock(sk);
continue;
}
l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
l2cap_build_conf_req(sk, buf), buf);
l2cap_pi(sk)->num_conf_req++;
}
bh_unlock_sock(sk);
}
read_unlock(&l->lock);
list_for_each_entry_safe(tmp1, tmp2, &del.list, list) {
bh_lock_sock(tmp1->sk);
__l2cap_sock_close(tmp1->sk, ECONNRESET);
bh_unlock_sock(tmp1->sk);
list_del(&tmp1->list);
kfree(tmp1);
}
}
static void l2cap_conn_ready(struct l2cap_conn *conn)
{
struct l2cap_chan_list *l = &conn->chan_list;
struct sock *sk;
BT_DBG("conn %p", conn);
read_lock(&l->lock);
for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
bh_lock_sock(sk);
if (sk->sk_type != SOCK_SEQPACKET &&
sk->sk_type != SOCK_STREAM) {
l2cap_sock_clear_timer(sk);
sk->sk_state = BT_CONNECTED;
sk->sk_state_change(sk);
} else if (sk->sk_state == BT_CONNECT)
l2cap_do_start(sk);
bh_unlock_sock(sk);
}
read_unlock(&l->lock);
}
/* Notify sockets that we cannot guaranty reliability anymore */
static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
{
struct l2cap_chan_list *l = &conn->chan_list;
struct sock *sk;
BT_DBG("conn %p", conn);
read_lock(&l->lock);
for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
if (l2cap_pi(sk)->force_reliable)
sk->sk_err = err;
}
read_unlock(&l->lock);
}
static void l2cap_info_timeout(unsigned long arg)
{
struct l2cap_conn *conn = (void *) arg;
conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
conn->info_ident = 0;
l2cap_conn_start(conn);
}
static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
{
struct l2cap_conn *conn = hcon->l2cap_data;
if (conn || status)
return conn;
conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
if (!conn)
return NULL;
hcon->l2cap_data = conn;
conn->hcon = hcon;
BT_DBG("hcon %p conn %p", hcon, conn);
conn->mtu = hcon->hdev->acl_mtu;
conn->src = &hcon->hdev->bdaddr;
conn->dst = &hcon->dst;
conn->feat_mask = 0;
spin_lock_init(&conn->lock);
rwlock_init(&conn->chan_list.lock);
setup_timer(&conn->info_timer, l2cap_info_timeout,
(unsigned long) conn);
conn->disc_reason = 0x13;
return conn;
}
static void l2cap_conn_del(struct hci_conn *hcon, int err)
{
struct l2cap_conn *conn = hcon->l2cap_data;
struct sock *sk;
if (!conn)
return;
BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
kfree_skb(conn->rx_skb);
/* Kill channels */
while ((sk = conn->chan_list.head)) {
bh_lock_sock(sk);
l2cap_chan_del(sk, err);
bh_unlock_sock(sk);
l2cap_sock_kill(sk);
}
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
del_timer_sync(&conn->info_timer);
hcon->l2cap_data = NULL;
kfree(conn);
}
static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
{
struct l2cap_chan_list *l = &conn->chan_list;
write_lock_bh(&l->lock);
__l2cap_chan_add(conn, sk, parent);
write_unlock_bh(&l->lock);
}
/* ---- Socket interface ---- */
/* Find socket with psm and source bdaddr.
* Returns closest match.
*/
static struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
{
struct sock *sk = NULL, *sk1 = NULL;
struct hlist_node *node;
read_lock(&l2cap_sk_list.lock);
sk_for_each(sk, node, &l2cap_sk_list.head) {
if (state && sk->sk_state != state)
continue;
if (l2cap_pi(sk)->psm == psm) {
/* Exact match. */
if (!bacmp(&bt_sk(sk)->src, src))
break;
/* Closest match */
if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
sk1 = sk;
}
}
read_unlock(&l2cap_sk_list.lock);
return node ? sk : sk1;
}
static void l2cap_sock_cleanup_listen(struct sock *parent)
{
struct sock *sk;
BT_DBG("parent %p", parent);
/* Close not yet accepted channels */
while ((sk = bt_accept_dequeue(parent, NULL)))
l2cap_sock_close(sk);
parent->sk_state = BT_CLOSED;
sock_set_flag(parent, SOCK_ZAPPED);
}
/* Kill socket (only if zapped and orphan)
* Must be called on unlocked socket.
*/
void l2cap_sock_kill(struct sock *sk)
{
if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
return;
BT_DBG("sk %p state %d", sk, sk->sk_state);
/* Kill poor orphan */
bt_sock_unlink(&l2cap_sk_list, sk);
sock_set_flag(sk, SOCK_DEAD);
sock_put(sk);
}
void __l2cap_sock_close(struct sock *sk, int reason)
{
BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
switch (sk->sk_state) {
case BT_LISTEN:
l2cap_sock_cleanup_listen(sk);
break;
case BT_CONNECTED:
case BT_CONFIG:
if (sk->sk_type == SOCK_SEQPACKET ||
sk->sk_type == SOCK_STREAM) {
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
l2cap_send_disconn_req(conn, sk, reason);
} else
l2cap_chan_del(sk, reason);
break;
case BT_CONNECT2:
if (sk->sk_type == SOCK_SEQPACKET ||
sk->sk_type == SOCK_STREAM) {
struct l2cap_conn *conn = l2cap_pi(sk)->conn;
struct l2cap_conn_rsp rsp;
__u16 result;
if (bt_sk(sk)->defer_setup)
result = L2CAP_CR_SEC_BLOCK;
else
result = L2CAP_CR_BAD_PSM;
sk->sk_state = BT_DISCONN;
rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
rsp.result = cpu_to_le16(result);
rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
L2CAP_CONN_RSP, sizeof(rsp), &rsp);
} else
l2cap_chan_del(sk, reason);
break;
case BT_CONNECT:
case BT_DISCONN:
l2cap_chan_del(sk, reason);
break;
default:
sock_set_flag(sk, SOCK_ZAPPED);
break;
}
}
/* Must be called on unlocked socket. */
static void l2cap_sock_close(struct sock *sk)
{
l2cap_sock_clear_timer(sk);
lock_sock(sk);
__l2cap_sock_close(sk, ECONNRESET);
release_sock(sk);
l2cap_sock_kill(sk);
}
int l2cap_do_connect(struct sock *sk)
{
bdaddr_t *src = &bt_sk(sk)->src;
bdaddr_t *dst = &bt_sk(sk)->dst;
struct l2cap_conn *conn;
struct hci_conn *hcon;
struct hci_dev *hdev;
__u8 auth_type;
int err;
BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
l2cap_pi(sk)->psm);
hdev = hci_get_route(dst, src);
if (!hdev)
return -EHOSTUNREACH;
hci_dev_lock_bh(hdev);
err = -ENOMEM;
auth_type = l2cap_get_auth_type(sk);
hcon = hci_connect(hdev, ACL_LINK, dst,
l2cap_pi(sk)->sec_level, auth_type);
if (!hcon)
goto done;
conn = l2cap_conn_add(hcon, 0);
if (!conn) {
hci_conn_put(hcon);
goto done;
}
err = 0;
/* Update source addr of the socket */
bacpy(src, conn->src);
l2cap_chan_add(conn, sk, NULL);
sk->sk_state = BT_CONNECT;
l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
if (hcon->state == BT_CONNECTED) {
if (sk->sk_type != SOCK_SEQPACKET &&
sk->sk_type != SOCK_STREAM) {
l2cap_sock_clear_timer(sk);
if (l2cap_check_security(sk))
sk->sk_state = BT_CONNECTED;
} else
l2cap_do_start(sk);
}
done:
hci_dev_unlock_bh(hdev);
hci_dev_put(hdev);
return err;
}
int __l2cap_wait_ack(struct sock *sk)
{
DECLARE_WAITQUEUE(wait, current);
int err = 0;
int timeo = HZ/5;
add_wait_queue(sk_sleep(sk), &wait);
while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) {
set_current_state(TASK_INTERRUPTIBLE);
if (!timeo)
timeo = HZ/5;
if (signal_pending(current)) {
err = sock_intr_errno(timeo);
break;
}
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
err = sock_error(sk);
if (err)
break;
}
set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait);
return err;
}
static void l2cap_monitor_timeout(unsigned long arg)
{
struct sock *sk = (void *) arg;
BT_DBG("sk %p", sk);
bh_lock_sock(sk);
if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED);
bh_unlock_sock(sk);
return;
}
l2cap_pi(sk)->retry_count++;
__mod_monitor_timer();
l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
bh_unlock_sock(sk);
}
static void l2cap_retrans_timeout(unsigned long arg)
{
struct sock *sk = (void *) arg;
BT_DBG("sk %p", sk);
bh_lock_sock(sk);
l2cap_pi(sk)->retry_count = 1;
__mod_monitor_timer();
l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
bh_unlock_sock(sk);
}
static void l2cap_drop_acked_frames(struct sock *sk)
{
struct sk_buff *skb;
while ((skb = skb_peek(TX_QUEUE(sk))) &&
l2cap_pi(sk)->unacked_frames) {
if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
break;
skb = skb_dequeue(TX_QUEUE(sk));
kfree_skb(skb);
l2cap_pi(sk)->unacked_frames--;
}
if (!l2cap_pi(sk)->unacked_frames)
del_timer(&l2cap_pi(sk)->retrans_timer);
}
void l2cap_do_send(struct sock *sk, struct sk_buff *skb)
{
struct l2cap_pinfo *pi = l2cap_pi(sk);
struct hci_conn *hcon = pi->conn->hcon;
u16 flags;