-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathbt-l2cap.c
1364 lines (1125 loc) · 42.8 KB
/
bt-l2cap.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
/*
* QEMU Bluetooth L2CAP logic.
*
* Copyright (C) 2008 Andrzej Zaborowski <[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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include "qemu-common.h"
#include "qemu-timer.h"
#include "bt.h"
#define L2CAP_CID_MAX 0x100 /* Between 0x40 and 0x10000 */
struct l2cap_instance_s {
struct bt_link_s *link;
struct bt_l2cap_device_s *dev;
int role;
uint8_t frame_in[65535 + L2CAP_HDR_SIZE] __attribute__ ((aligned (4)));
int frame_in_len;
uint8_t frame_out[65535 + L2CAP_HDR_SIZE] __attribute__ ((aligned (4)));
int frame_out_len;
/* Signalling channel timers. They exist per-request but we can make
* sure we have no more than one outstanding request at any time. */
QEMUTimer *rtx;
QEMUTimer *ertx;
int last_id;
int next_id;
struct l2cap_chan_s {
struct bt_l2cap_conn_params_s params;
void (*frame_in)(struct l2cap_chan_s *chan, uint16_t cid,
const l2cap_hdr *hdr, int len);
int mps;
int min_mtu;
struct l2cap_instance_s *l2cap;
/* Only allocated channels */
uint16_t remote_cid;
#define L2CAP_CFG_INIT 2
#define L2CAP_CFG_ACC 1
int config_req_id; /* TODO: handle outgoing requests generically */
int config;
/* Only connection-oriented channels. Note: if we allow the tx and
* rx traffic to be in different modes at any time, we need two. */
int mode;
/* Only flow-controlled, connection-oriented channels */
uint8_t sdu[65536]; /* TODO: dynamically allocate */
int len_cur, len_total;
int rexmit;
int monitor_timeout;
QEMUTimer *monitor_timer;
QEMUTimer *retransmission_timer;
} *cid[L2CAP_CID_MAX];
/* The channel state machine states map as following:
* CLOSED -> !cid[N]
* WAIT_CONNECT -> never occurs
* WAIT_CONNECT_RSP -> never occurs
* CONFIG -> cid[N] && config < 3
* WAIT_CONFIG -> never occurs, cid[N] && config == 0 && !config_r
* WAIT_SEND_CONFIG -> never occurs, cid[N] && config == 1 && !config_r
* WAIT_CONFIG_REQ_RSP -> cid[N] && config == 0 && config_req_id
* WAIT_CONFIG_RSP -> cid[N] && config == 1 && config_req_id
* WAIT_CONFIG_REQ -> cid[N] && config == 2
* OPEN -> cid[N] && config == 3
* WAIT_DISCONNECT -> never occurs
*/
struct l2cap_chan_s signalling_ch;
struct l2cap_chan_s group_ch;
};
struct slave_l2cap_instance_s {
struct bt_link_s link; /* Underlying logical link (ACL) */
struct l2cap_instance_s l2cap;
};
struct bt_l2cap_psm_s {
int psm;
int min_mtu;
int (*new_channel)(struct bt_l2cap_device_s *device,
struct bt_l2cap_conn_params_s *params);
struct bt_l2cap_psm_s *next;
};
static const uint16_t l2cap_fcs16_table[256] = {
0x0000, 0xc0c1, 0xc181, 0x0140, 0xc301, 0x03c0, 0x0280, 0xc241,
0xc601, 0x06c0, 0x0780, 0xc741, 0x0500, 0xc5c1, 0xc481, 0x0440,
0xcc01, 0x0cc0, 0x0d80, 0xcd41, 0x0f00, 0xcfc1, 0xce81, 0x0e40,
0x0a00, 0xcac1, 0xcb81, 0x0b40, 0xc901, 0x09c0, 0x0880, 0xc841,
0xd801, 0x18c0, 0x1980, 0xd941, 0x1b00, 0xdbc1, 0xda81, 0x1a40,
0x1e00, 0xdec1, 0xdf81, 0x1f40, 0xdd01, 0x1dc0, 0x1c80, 0xdc41,
0x1400, 0xd4c1, 0xd581, 0x1540, 0xd701, 0x17c0, 0x1680, 0xd641,
0xd201, 0x12c0, 0x1380, 0xd341, 0x1100, 0xd1c1, 0xd081, 0x1040,
0xf001, 0x30c0, 0x3180, 0xf141, 0x3300, 0xf3c1, 0xf281, 0x3240,
0x3600, 0xf6c1, 0xf781, 0x3740, 0xf501, 0x35c0, 0x3480, 0xf441,
0x3c00, 0xfcc1, 0xfd81, 0x3d40, 0xff01, 0x3fc0, 0x3e80, 0xfe41,
0xfa01, 0x3ac0, 0x3b80, 0xfb41, 0x3900, 0xf9c1, 0xf881, 0x3840,
0x2800, 0xe8c1, 0xe981, 0x2940, 0xeb01, 0x2bc0, 0x2a80, 0xea41,
0xee01, 0x2ec0, 0x2f80, 0xef41, 0x2d00, 0xedc1, 0xec81, 0x2c40,
0xe401, 0x24c0, 0x2580, 0xe541, 0x2700, 0xe7c1, 0xe681, 0x2640,
0x2200, 0xe2c1, 0xe381, 0x2340, 0xe101, 0x21c0, 0x2080, 0xe041,
0xa001, 0x60c0, 0x6180, 0xa141, 0x6300, 0xa3c1, 0xa281, 0x6240,
0x6600, 0xa6c1, 0xa781, 0x6740, 0xa501, 0x65c0, 0x6480, 0xa441,
0x6c00, 0xacc1, 0xad81, 0x6d40, 0xaf01, 0x6fc0, 0x6e80, 0xae41,
0xaa01, 0x6ac0, 0x6b80, 0xab41, 0x6900, 0xa9c1, 0xa881, 0x6840,
0x7800, 0xb8c1, 0xb981, 0x7940, 0xbb01, 0x7bc0, 0x7a80, 0xba41,
0xbe01, 0x7ec0, 0x7f80, 0xbf41, 0x7d00, 0xbdc1, 0xbc81, 0x7c40,
0xb401, 0x74c0, 0x7580, 0xb541, 0x7700, 0xb7c1, 0xb681, 0x7640,
0x7200, 0xb2c1, 0xb381, 0x7340, 0xb101, 0x71c0, 0x7080, 0xb041,
0x5000, 0x90c1, 0x9181, 0x5140, 0x9301, 0x53c0, 0x5280, 0x9241,
0x9601, 0x56c0, 0x5780, 0x9741, 0x5500, 0x95c1, 0x9481, 0x5440,
0x9c01, 0x5cc0, 0x5d80, 0x9d41, 0x5f00, 0x9fc1, 0x9e81, 0x5e40,
0x5a00, 0x9ac1, 0x9b81, 0x5b40, 0x9901, 0x59c0, 0x5880, 0x9841,
0x8801, 0x48c0, 0x4980, 0x8941, 0x4b00, 0x8bc1, 0x8a81, 0x4a40,
0x4e00, 0x8ec1, 0x8f81, 0x4f40, 0x8d01, 0x4dc0, 0x4c80, 0x8c41,
0x4400, 0x84c1, 0x8581, 0x4540, 0x8701, 0x47c0, 0x4680, 0x8641,
0x8201, 0x42c0, 0x4380, 0x8341, 0x4100, 0x81c1, 0x8081, 0x4040,
};
static uint16_t l2cap_fcs16(const uint8_t *message, int len)
{
uint16_t fcs = 0x0000;
while (len --)
#if 0
{
int i;
fcs ^= *message ++;
for (i = 8; i; -- i)
if (fcs & 1)
fcs = (fcs >> 1) ^ 0xa001;
else
fcs = (fcs >> 1);
}
#else
fcs = (fcs >> 8) ^ l2cap_fcs16_table[(fcs ^ *message ++) & 0xff];
#endif
return fcs;
}
/* L2CAP layer logic (protocol) */
static void l2cap_retransmission_timer_update(struct l2cap_chan_s *ch)
{
#if 0
if (ch->mode != L2CAP_MODE_BASIC && ch->rexmit)
qemu_mod_timer(ch->retransmission_timer);
else
qemu_del_timer(ch->retransmission_timer);
#endif
}
static void l2cap_monitor_timer_update(struct l2cap_chan_s *ch)
{
#if 0
if (ch->mode != L2CAP_MODE_BASIC && !ch->rexmit)
qemu_mod_timer(ch->monitor_timer);
else
qemu_del_timer(ch->monitor_timer);
#endif
}
static void l2cap_command_reject(struct l2cap_instance_s *l2cap, int id,
uint16_t reason, const void *data, int plen)
{
uint8_t *pkt;
l2cap_cmd_hdr *hdr;
l2cap_cmd_rej *params;
uint16_t len;
reason = cpu_to_le16(reason);
len = cpu_to_le16(L2CAP_CMD_REJ_SIZE + plen);
pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params,
L2CAP_CMD_HDR_SIZE + L2CAP_CMD_REJ_SIZE + plen);
hdr = (void *) (pkt + 0);
params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
hdr->code = L2CAP_COMMAND_REJ;
hdr->ident = id;
memcpy(&hdr->len, &len, sizeof(hdr->len));
memcpy(¶ms->reason, &reason, sizeof(reason));
if (plen)
memcpy(pkt + L2CAP_CMD_HDR_SIZE + L2CAP_CMD_REJ_SIZE, data, plen);
l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params);
}
static void l2cap_command_reject_cid(struct l2cap_instance_s *l2cap, int id,
uint16_t reason, uint16_t dcid, uint16_t scid)
{
l2cap_cmd_rej_cid params = {
.dcid = dcid,
.scid = scid,
};
l2cap_command_reject(l2cap, id, reason, ¶ms, L2CAP_CMD_REJ_CID_SIZE);
}
static void l2cap_connection_response(struct l2cap_instance_s *l2cap,
int dcid, int scid, int result, int status)
{
uint8_t *pkt;
l2cap_cmd_hdr *hdr;
l2cap_conn_rsp *params;
pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params,
L2CAP_CMD_HDR_SIZE + L2CAP_CONN_RSP_SIZE);
hdr = (void *) (pkt + 0);
params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
hdr->code = L2CAP_CONN_RSP;
hdr->ident = l2cap->last_id;
hdr->len = cpu_to_le16(L2CAP_CONN_RSP_SIZE);
params->dcid = cpu_to_le16(dcid);
params->scid = cpu_to_le16(scid);
params->result = cpu_to_le16(result);
params->status = cpu_to_le16(status);
l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params);
}
static void l2cap_configuration_request(struct l2cap_instance_s *l2cap,
int dcid, int flag, const uint8_t *data, int len)
{
uint8_t *pkt;
l2cap_cmd_hdr *hdr;
l2cap_conf_req *params;
pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params,
L2CAP_CMD_HDR_SIZE + L2CAP_CONF_REQ_SIZE(len));
hdr = (void *) (pkt + 0);
params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
/* TODO: unify the id sequencing */
l2cap->last_id = l2cap->next_id;
l2cap->next_id = l2cap->next_id == 255 ? 1 : l2cap->next_id + 1;
hdr->code = L2CAP_CONF_REQ;
hdr->ident = l2cap->last_id;
hdr->len = cpu_to_le16(L2CAP_CONF_REQ_SIZE(len));
params->dcid = cpu_to_le16(dcid);
params->flags = cpu_to_le16(flag);
if (len)
memcpy(params->data, data, len);
l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params);
}
static void l2cap_configuration_response(struct l2cap_instance_s *l2cap,
int scid, int flag, int result, const uint8_t *data, int len)
{
uint8_t *pkt;
l2cap_cmd_hdr *hdr;
l2cap_conf_rsp *params;
pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params,
L2CAP_CMD_HDR_SIZE + L2CAP_CONF_RSP_SIZE(len));
hdr = (void *) (pkt + 0);
params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
hdr->code = L2CAP_CONF_RSP;
hdr->ident = l2cap->last_id;
hdr->len = cpu_to_le16(L2CAP_CONF_RSP_SIZE(len));
params->scid = cpu_to_le16(scid);
params->flags = cpu_to_le16(flag);
params->result = cpu_to_le16(result);
if (len)
memcpy(params->data, data, len);
l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params);
}
static void l2cap_disconnection_response(struct l2cap_instance_s *l2cap,
int dcid, int scid)
{
uint8_t *pkt;
l2cap_cmd_hdr *hdr;
l2cap_disconn_rsp *params;
pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params,
L2CAP_CMD_HDR_SIZE + L2CAP_DISCONN_RSP_SIZE);
hdr = (void *) (pkt + 0);
params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
hdr->code = L2CAP_DISCONN_RSP;
hdr->ident = l2cap->last_id;
hdr->len = cpu_to_le16(L2CAP_DISCONN_RSP_SIZE);
params->dcid = cpu_to_le16(dcid);
params->scid = cpu_to_le16(scid);
l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params);
}
static void l2cap_echo_response(struct l2cap_instance_s *l2cap,
const uint8_t *data, int len)
{
uint8_t *pkt;
l2cap_cmd_hdr *hdr;
uint8_t *params;
pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params,
L2CAP_CMD_HDR_SIZE + len);
hdr = (void *) (pkt + 0);
params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
hdr->code = L2CAP_ECHO_RSP;
hdr->ident = l2cap->last_id;
hdr->len = cpu_to_le16(len);
memcpy(params, data, len);
l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params);
}
static void l2cap_info_response(struct l2cap_instance_s *l2cap, int type,
int result, const uint8_t *data, int len)
{
uint8_t *pkt;
l2cap_cmd_hdr *hdr;
l2cap_info_rsp *params;
pkt = l2cap->signalling_ch.params.sdu_out(&l2cap->signalling_ch.params,
L2CAP_CMD_HDR_SIZE + L2CAP_INFO_RSP_SIZE + len);
hdr = (void *) (pkt + 0);
params = (void *) (pkt + L2CAP_CMD_HDR_SIZE);
hdr->code = L2CAP_INFO_RSP;
hdr->ident = l2cap->last_id;
hdr->len = cpu_to_le16(L2CAP_INFO_RSP_SIZE + len);
params->type = cpu_to_le16(type);
params->result = cpu_to_le16(result);
if (len)
memcpy(params->data, data, len);
l2cap->signalling_ch.params.sdu_submit(&l2cap->signalling_ch.params);
}
static uint8_t *l2cap_bframe_out(struct bt_l2cap_conn_params_s *parm, int len);
static void l2cap_bframe_submit(struct bt_l2cap_conn_params_s *parms);
#if 0
static uint8_t *l2cap_iframe_out(struct bt_l2cap_conn_params_s *parm, int len);
static void l2cap_iframe_submit(struct bt_l2cap_conn_params_s *parm);
#endif
static void l2cap_bframe_in(struct l2cap_chan_s *ch, uint16_t cid,
const l2cap_hdr *hdr, int len);
static void l2cap_iframe_in(struct l2cap_chan_s *ch, uint16_t cid,
const l2cap_hdr *hdr, int len);
static int l2cap_cid_new(struct l2cap_instance_s *l2cap)
{
int i;
for (i = L2CAP_CID_ALLOC; i < L2CAP_CID_MAX; i ++)
if (!l2cap->cid[i])
return i;
return L2CAP_CID_INVALID;
}
static inline struct bt_l2cap_psm_s *l2cap_psm(
struct bt_l2cap_device_s *device, int psm)
{
struct bt_l2cap_psm_s *ret = device->first_psm;
while (ret && ret->psm != psm)
ret = ret->next;
return ret;
}
static struct l2cap_chan_s *l2cap_channel_open(struct l2cap_instance_s *l2cap,
int psm, int source_cid)
{
struct l2cap_chan_s *ch = 0;
struct bt_l2cap_psm_s *psm_info;
int result, status;
int cid = l2cap_cid_new(l2cap);
if (cid) {
/* See what the channel is to be used for.. */
psm_info = l2cap_psm(l2cap->dev, psm);
if (psm_info) {
/* Device supports this use-case. */
ch = qemu_mallocz(sizeof(*ch));
ch->params.sdu_out = l2cap_bframe_out;
ch->params.sdu_submit = l2cap_bframe_submit;
ch->frame_in = l2cap_bframe_in;
ch->mps = 65536;
ch->min_mtu = MAX(48, psm_info->min_mtu);
ch->params.remote_mtu = MAX(672, ch->min_mtu);
ch->remote_cid = source_cid;
ch->mode = L2CAP_MODE_BASIC;
ch->l2cap = l2cap;
/* Does it feel like opening yet another channel though? */
if (!psm_info->new_channel(l2cap->dev, &ch->params)) {
l2cap->cid[cid] = ch;
result = L2CAP_CR_SUCCESS;
status = L2CAP_CS_NO_INFO;
} else {
qemu_free(ch);
result = L2CAP_CR_NO_MEM;
status = L2CAP_CS_NO_INFO;
}
} else {
result = L2CAP_CR_BAD_PSM;
status = L2CAP_CS_NO_INFO;
}
} else {
result = L2CAP_CR_NO_MEM;
status = L2CAP_CS_NO_INFO;
}
l2cap_connection_response(l2cap, cid, source_cid, result, status);
return ch;
}
static void l2cap_channel_close(struct l2cap_instance_s *l2cap,
int cid, int source_cid)
{
struct l2cap_chan_s *ch = 0;
/* According to Volume 3, section 6.1.1, pg 1048 of BT Core V2.0, a
* connection in CLOSED state still responds with a L2CAP_DisconnectRsp
* message on an L2CAP_DisconnectReq event. */
if (unlikely(cid < L2CAP_CID_ALLOC)) {
l2cap_command_reject_cid(l2cap, l2cap->last_id, L2CAP_REJ_CID_INVAL,
cid, source_cid);
return;
}
if (likely(cid >= L2CAP_CID_ALLOC && cid < L2CAP_CID_MAX))
ch = l2cap->cid[cid];
if (likely(ch)) {
if (ch->remote_cid != source_cid) {
fprintf(stderr, "%s: Ignoring a Disconnection Request with the "
"invalid SCID %04x.\n", __FUNCTION__, source_cid);
return;
}
l2cap->cid[cid] = 0;
ch->params.close(ch->params.opaque);
qemu_free(ch);
}
l2cap_disconnection_response(l2cap, cid, source_cid);
}
static void l2cap_channel_config_null(struct l2cap_instance_s *l2cap,
struct l2cap_chan_s *ch)
{
l2cap_configuration_request(l2cap, ch->remote_cid, 0, 0, 0);
ch->config_req_id = l2cap->last_id;
ch->config &= ~L2CAP_CFG_INIT;
}
static void l2cap_channel_config_req_event(struct l2cap_instance_s *l2cap,
struct l2cap_chan_s *ch)
{
/* Use all default channel options and terminate negotiation. */
l2cap_channel_config_null(l2cap, ch);
}
static int l2cap_channel_config(struct l2cap_instance_s *l2cap,
struct l2cap_chan_s *ch, int flag,
const uint8_t *data, int len)
{
l2cap_conf_opt *opt;
l2cap_conf_opt_qos *qos;
uint32_t val;
uint8_t rsp[len];
int result = L2CAP_CONF_SUCCESS;
data = memcpy(rsp, data, len);
while (len) {
opt = (void *) data;
if (len < L2CAP_CONF_OPT_SIZE ||
len < L2CAP_CONF_OPT_SIZE + opt->len) {
result = L2CAP_CONF_REJECT;
break;
}
data += L2CAP_CONF_OPT_SIZE + opt->len;
len -= L2CAP_CONF_OPT_SIZE + opt->len;
switch (opt->type & 0x7f) {
case L2CAP_CONF_MTU:
if (opt->len != 2) {
result = L2CAP_CONF_REJECT;
break;
}
/* MTU */
val = le16_to_cpup((void *) opt->val);
if (val < ch->min_mtu) {
cpu_to_le16w((void *) opt->val, ch->min_mtu);
result = L2CAP_CONF_UNACCEPT;
break;
}
ch->params.remote_mtu = val;
break;
case L2CAP_CONF_FLUSH_TO:
if (opt->len != 2) {
result = L2CAP_CONF_REJECT;
break;
}
/* Flush Timeout */
val = le16_to_cpup((void *) opt->val);
if (val < 0x0001) {
opt->val[0] = 0xff;
opt->val[1] = 0xff;
result = L2CAP_CONF_UNACCEPT;
break;
}
break;
case L2CAP_CONF_QOS:
if (opt->len != L2CAP_CONF_OPT_QOS_SIZE) {
result = L2CAP_CONF_REJECT;
break;
}
qos = (void *) opt->val;
/* Flags */
val = qos->flags;
if (val) {
qos->flags = 0;
result = L2CAP_CONF_UNACCEPT;
}
/* Service type */
val = qos->service_type;
if (val != L2CAP_CONF_QOS_BEST_EFFORT &&
val != L2CAP_CONF_QOS_NO_TRAFFIC) {
qos->service_type = L2CAP_CONF_QOS_BEST_EFFORT;
result = L2CAP_CONF_UNACCEPT;
}
if (val != L2CAP_CONF_QOS_NO_TRAFFIC) {
/* XXX: These values should possibly be calculated
* based on LM / baseband properties also. */
/* Token rate */
val = le32_to_cpu(qos->token_rate);
if (val == L2CAP_CONF_QOS_WILDCARD)
qos->token_rate = cpu_to_le32(0x100000);
/* Token bucket size */
val = le32_to_cpu(qos->token_bucket_size);
if (val == L2CAP_CONF_QOS_WILDCARD)
qos->token_bucket_size = cpu_to_le32(65500);
/* Any Peak bandwidth value is correct to return as-is */
/* Any Access latency value is correct to return as-is */
/* Any Delay variation value is correct to return as-is */
}
break;
case L2CAP_CONF_RFC:
if (opt->len != 9) {
result = L2CAP_CONF_REJECT;
break;
}
/* Mode */
val = opt->val[0];
switch (val) {
case L2CAP_MODE_BASIC:
ch->mode = val;
ch->frame_in = l2cap_bframe_in;
/* All other parameters shall be ignored */
break;
case L2CAP_MODE_RETRANS:
case L2CAP_MODE_FLOWCTL:
ch->mode = val;
ch->frame_in = l2cap_iframe_in;
/* Note: most of these parameters refer to incoming traffic
* so we don't need to save them as long as we can accept
* incoming PDUs at any values of the parameters. */
/* TxWindow size */
val = opt->val[1];
if (val < 1 || val > 32) {
opt->val[1] = 32;
result = L2CAP_CONF_UNACCEPT;
break;
}
/* MaxTransmit */
val = opt->val[2];
if (val < 1) {
opt->val[2] = 1;
result = L2CAP_CONF_UNACCEPT;
break;
}
/* Remote Retransmission time-out shouldn't affect local
* operation (?) */
/* The Monitor time-out drives the local Monitor timer (?),
* so save the value. */
val = (opt->val[6] << 8) | opt->val[5];
if (val < 30) {
opt->val[5] = 100 & 0xff;
opt->val[6] = 100 >> 8;
result = L2CAP_CONF_UNACCEPT;
break;
}
ch->monitor_timeout = val;
l2cap_monitor_timer_update(ch);
/* MPS */
val = (opt->val[8] << 8) | opt->val[7];
if (val < ch->min_mtu) {
opt->val[7] = ch->min_mtu & 0xff;
opt->val[8] = ch->min_mtu >> 8;
result = L2CAP_CONF_UNACCEPT;
break;
}
ch->mps = val;
break;
default:
result = L2CAP_CONF_UNACCEPT;
break;
}
break;
default:
if (!(opt->type >> 7))
result = L2CAP_CONF_UNKNOWN;
break;
}
if (result != L2CAP_CONF_SUCCESS)
break; /* XXX: should continue? */
}
l2cap_configuration_response(l2cap, ch->remote_cid,
flag, result, rsp, len);
return result == L2CAP_CONF_SUCCESS && !flag;
}
static void l2cap_channel_config_req_msg(struct l2cap_instance_s *l2cap,
int flag, int cid, const uint8_t *data, int len)
{
struct l2cap_chan_s *ch;
if (unlikely(cid >= L2CAP_CID_MAX || !l2cap->cid[cid])) {
l2cap_command_reject_cid(l2cap, l2cap->last_id, L2CAP_REJ_CID_INVAL,
cid, 0x0000);
return;
}
ch = l2cap->cid[cid];
/* From OPEN go to WAIT_CONFIG_REQ and from WAIT_CONFIG_REQ_RSP to
* WAIT_CONFIG_REQ_RSP. This is assuming the transition chart for OPEN
* on pg 1053, section 6.1.5, volume 3 of BT Core V2.0 has a mistake
* and on options-acceptable we go back to OPEN and otherwise to
* WAIT_CONFIG_REQ and not the other way. */
ch->config &= ~L2CAP_CFG_ACC;
if (l2cap_channel_config(l2cap, ch, flag, data, len))
/* Go to OPEN or WAIT_CONFIG_RSP */
ch->config |= L2CAP_CFG_ACC;
/* TODO: if the incoming traffic flow control or retransmission mode
* changed then we probably need to also generate the
* ConfigureChannel_Req event and set the outgoing traffic to the same
* mode. */
if (!(ch->config & L2CAP_CFG_INIT) && (ch->config & L2CAP_CFG_ACC) &&
!ch->config_req_id)
l2cap_channel_config_req_event(l2cap, ch);
}
static int l2cap_channel_config_rsp_msg(struct l2cap_instance_s *l2cap,
int result, int flag, int cid, const uint8_t *data, int len)
{
struct l2cap_chan_s *ch;
if (unlikely(cid >= L2CAP_CID_MAX || !l2cap->cid[cid])) {
l2cap_command_reject_cid(l2cap, l2cap->last_id, L2CAP_REJ_CID_INVAL,
cid, 0x0000);
return 0;
}
ch = l2cap->cid[cid];
if (ch->config_req_id != l2cap->last_id)
return 1;
ch->config_req_id = 0;
if (result == L2CAP_CONF_SUCCESS) {
if (!flag)
ch->config |= L2CAP_CFG_INIT;
else
l2cap_channel_config_null(l2cap, ch);
} else
/* Retry until we succeed */
l2cap_channel_config_req_event(l2cap, ch);
return 0;
}
static void l2cap_channel_open_req_msg(struct l2cap_instance_s *l2cap,
int psm, int source_cid)
{
struct l2cap_chan_s *ch = l2cap_channel_open(l2cap, psm, source_cid);
if (!ch)
return;
/* Optional */
if (!(ch->config & L2CAP_CFG_INIT) && !ch->config_req_id)
l2cap_channel_config_req_event(l2cap, ch);
}
static void l2cap_info(struct l2cap_instance_s *l2cap, int type)
{
uint8_t data[4];
int len = 0;
int result = L2CAP_IR_SUCCESS;
switch (type) {
case L2CAP_IT_CL_MTU:
data[len ++] = l2cap->group_ch.mps & 0xff;
data[len ++] = l2cap->group_ch.mps >> 8;
break;
case L2CAP_IT_FEAT_MASK:
/* (Prematurely) report Flow control and Retransmission modes. */
data[len ++] = 0x03;
data[len ++] = 0x00;
data[len ++] = 0x00;
data[len ++] = 0x00;
break;
default:
result = L2CAP_IR_NOTSUPP;
}
l2cap_info_response(l2cap, type, result, data, len);
}
static void l2cap_command(struct l2cap_instance_s *l2cap, int code, int id,
const uint8_t *params, int len)
{
int err;
#if 0
/* TODO: do the IDs really have to be in sequence? */
if (!id || (id != l2cap->last_id && id != l2cap->next_id)) {
fprintf(stderr, "%s: out of sequence command packet ignored.\n",
__FUNCTION__);
return;
}
#else
l2cap->next_id = id;
#endif
if (id == l2cap->next_id) {
l2cap->last_id = l2cap->next_id;
l2cap->next_id = l2cap->next_id == 255 ? 1 : l2cap->next_id + 1;
} else {
/* TODO: Need to re-send the same response, without re-executing
* the corresponding command! */
}
switch (code) {
case L2CAP_COMMAND_REJ:
if (unlikely(len != 2 && len != 4 && len != 6)) {
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD;
goto reject;
}
/* We never issue commands other than Command Reject currently. */
fprintf(stderr, "%s: stray Command Reject (%02x, %04x) "
"packet, ignoring.\n", __FUNCTION__, id,
le16_to_cpu(((l2cap_cmd_rej *) params)->reason));
break;
case L2CAP_CONN_REQ:
if (unlikely(len != L2CAP_CONN_REQ_SIZE)) {
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD;
goto reject;
}
l2cap_channel_open_req_msg(l2cap,
le16_to_cpu(((l2cap_conn_req *) params)->psm),
le16_to_cpu(((l2cap_conn_req *) params)->scid));
break;
case L2CAP_CONN_RSP:
if (unlikely(len != L2CAP_CONN_RSP_SIZE)) {
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD;
goto reject;
}
/* We never issue Connection Requests currently. TODO */
fprintf(stderr, "%s: unexpected Connection Response (%02x) "
"packet, ignoring.\n", __FUNCTION__, id);
break;
case L2CAP_CONF_REQ:
if (unlikely(len < L2CAP_CONF_REQ_SIZE(0))) {
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD;
goto reject;
}
l2cap_channel_config_req_msg(l2cap,
le16_to_cpu(((l2cap_conf_req *) params)->flags) & 1,
le16_to_cpu(((l2cap_conf_req *) params)->dcid),
((l2cap_conf_req *) params)->data,
len - L2CAP_CONF_REQ_SIZE(0));
break;
case L2CAP_CONF_RSP:
if (unlikely(len < L2CAP_CONF_RSP_SIZE(0))) {
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD;
goto reject;
}
if (l2cap_channel_config_rsp_msg(l2cap,
le16_to_cpu(((l2cap_conf_rsp *) params)->result),
le16_to_cpu(((l2cap_conf_rsp *) params)->flags) & 1,
le16_to_cpu(((l2cap_conf_rsp *) params)->scid),
((l2cap_conf_rsp *) params)->data,
len - L2CAP_CONF_RSP_SIZE(0)))
fprintf(stderr, "%s: unexpected Configure Response (%02x) "
"packet, ignoring.\n", __FUNCTION__, id);
break;
case L2CAP_DISCONN_REQ:
if (unlikely(len != L2CAP_DISCONN_REQ_SIZE)) {
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD;
goto reject;
}
l2cap_channel_close(l2cap,
le16_to_cpu(((l2cap_disconn_req *) params)->dcid),
le16_to_cpu(((l2cap_disconn_req *) params)->scid));
break;
case L2CAP_DISCONN_RSP:
if (unlikely(len != L2CAP_DISCONN_RSP_SIZE)) {
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD;
goto reject;
}
/* We never issue Disconnection Requests currently. TODO */
fprintf(stderr, "%s: unexpected Disconnection Response (%02x) "
"packet, ignoring.\n", __FUNCTION__, id);
break;
case L2CAP_ECHO_REQ:
l2cap_echo_response(l2cap, params, len);
break;
case L2CAP_ECHO_RSP:
/* We never issue Echo Requests currently. TODO */
fprintf(stderr, "%s: unexpected Echo Response (%02x) "
"packet, ignoring.\n", __FUNCTION__, id);
break;
case L2CAP_INFO_REQ:
if (unlikely(len != L2CAP_INFO_REQ_SIZE)) {
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD;
goto reject;
}
l2cap_info(l2cap, le16_to_cpu(((l2cap_info_req *) params)->type));
break;
case L2CAP_INFO_RSP:
if (unlikely(len != L2CAP_INFO_RSP_SIZE)) {
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD;
goto reject;
}
/* We never issue Information Requests currently. TODO */
fprintf(stderr, "%s: unexpected Information Response (%02x) "
"packet, ignoring.\n", __FUNCTION__, id);
break;
default:
err = L2CAP_REJ_CMD_NOT_UNDERSTOOD;
reject:
l2cap_command_reject(l2cap, id, err, 0, 0);
break;
}
}
static void l2cap_rexmit_enable(struct l2cap_chan_s *ch, int enable)
{
ch->rexmit = enable;
l2cap_retransmission_timer_update(ch);
l2cap_monitor_timer_update(ch);
}
/* Command frame SDU */
static void l2cap_cframe_in(void *opaque, const uint8_t *data, int len)
{
struct l2cap_instance_s *l2cap = opaque;
const l2cap_cmd_hdr *hdr;
int clen;
while (len) {
hdr = (void *) data;
if (len < L2CAP_CMD_HDR_SIZE)
/* TODO: signal an error */
return;
len -= L2CAP_CMD_HDR_SIZE;
data += L2CAP_CMD_HDR_SIZE;
clen = le16_to_cpu(hdr->len);
if (len < clen) {
l2cap_command_reject(l2cap, hdr->ident,
L2CAP_REJ_CMD_NOT_UNDERSTOOD, 0, 0);
break;
}
l2cap_command(l2cap, hdr->code, hdr->ident, data, clen);
len -= clen;
data += clen;
}
}
/* Group frame SDU */
static void l2cap_gframe_in(void *opaque, const uint8_t *data, int len)
{
}
/* Supervisory frame */
static void l2cap_sframe_in(struct l2cap_chan_s *ch, uint16_t ctrl)
{
}
/* Basic L2CAP mode Information frame */
static void l2cap_bframe_in(struct l2cap_chan_s *ch, uint16_t cid,
const l2cap_hdr *hdr, int len)
{
/* We have a full SDU, no further processing */
ch->params.sdu_in(ch->params.opaque, hdr->data, len);
}
/* Flow Control and Retransmission mode frame */
static void l2cap_iframe_in(struct l2cap_chan_s *ch, uint16_t cid,
const l2cap_hdr *hdr, int len)
{
uint16_t fcs = le16_to_cpup((void *) (hdr->data + len - 2));
if (len < 4)
goto len_error;
if (l2cap_fcs16((const uint8_t *) hdr, L2CAP_HDR_SIZE + len - 2) != fcs)
goto fcs_error;
if ((hdr->data[0] >> 7) == ch->rexmit)
l2cap_rexmit_enable(ch, !(hdr->data[0] >> 7));
if (hdr->data[0] & 1) {