1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5 Copyright (C) 2010 Google Inc.
6
7 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License version 2 as
11 published by the Free Software Foundation;
12
13 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
14 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
16 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
17 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
18 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21
22 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
23 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
24 SOFTWARE IS DISCLAIMED.
25 */
26
27 #ifndef __L2CAP_H
28 #define __L2CAP_H
29
30 #include <asm/unaligned.h>
31 #include <linux/atomic.h>
32 #include <linux/android_kabi.h>
33
34 /* L2CAP defaults */
35 #define L2CAP_DEFAULT_MTU 672
36 #define L2CAP_DEFAULT_MIN_MTU 48
37 #define L2CAP_DEFAULT_FLUSH_TO 0xFFFF
38 #define L2CAP_EFS_DEFAULT_FLUSH_TO 0xFFFFFFFF
39 #define L2CAP_DEFAULT_TX_WINDOW 63
40 #define L2CAP_DEFAULT_EXT_WINDOW 0x3FFF
41 #define L2CAP_DEFAULT_MAX_TX 3
42 #define L2CAP_DEFAULT_RETRANS_TO 2000 /* 2 seconds */
43 #define L2CAP_DEFAULT_MONITOR_TO 12000 /* 12 seconds */
44 #define L2CAP_DEFAULT_MAX_PDU_SIZE 1492 /* Sized for AMP packet */
45 #define L2CAP_DEFAULT_ACK_TO 200
46 #define L2CAP_DEFAULT_MAX_SDU_SIZE 0xFFFF
47 #define L2CAP_DEFAULT_SDU_ITIME 0xFFFFFFFF
48 #define L2CAP_DEFAULT_ACC_LAT 0xFFFFFFFF
49 #define L2CAP_BREDR_MAX_PAYLOAD 1019 /* 3-DH5 packet */
50 #define L2CAP_LE_MIN_MTU 23
51 #define L2CAP_ECRED_CONN_SCID_MAX 5
52
53 #define L2CAP_DISC_TIMEOUT msecs_to_jiffies(100)
54 #define L2CAP_DISC_REJ_TIMEOUT msecs_to_jiffies(5000)
55 #define L2CAP_ENC_TIMEOUT msecs_to_jiffies(5000)
56 #define L2CAP_CONN_TIMEOUT msecs_to_jiffies(40000)
57 #define L2CAP_INFO_TIMEOUT msecs_to_jiffies(4000)
58 #define L2CAP_MOVE_TIMEOUT msecs_to_jiffies(4000)
59 #define L2CAP_MOVE_ERTX_TIMEOUT msecs_to_jiffies(60000)
60 #define L2CAP_WAIT_ACK_POLL_PERIOD msecs_to_jiffies(200)
61 #define L2CAP_WAIT_ACK_TIMEOUT msecs_to_jiffies(10000)
62
63 #define L2CAP_A2MP_DEFAULT_MTU 670
64
65 /* L2CAP socket address */
66 struct sockaddr_l2 {
67 sa_family_t l2_family;
68 __le16 l2_psm;
69 bdaddr_t l2_bdaddr;
70 __le16 l2_cid;
71 __u8 l2_bdaddr_type;
72 };
73
74 /* L2CAP socket options */
75 #define L2CAP_OPTIONS 0x01
76 struct l2cap_options {
77 __u16 omtu;
78 __u16 imtu;
79 __u16 flush_to;
80 __u8 mode;
81 __u8 fcs;
82 __u8 max_tx;
83 __u16 txwin_size;
84 };
85
86 #define L2CAP_CONNINFO 0x02
87 struct l2cap_conninfo {
88 __u16 hci_handle;
89 __u8 dev_class[3];
90 };
91
92 #define L2CAP_LM 0x03
93 #define L2CAP_LM_MASTER 0x0001
94 #define L2CAP_LM_AUTH 0x0002
95 #define L2CAP_LM_ENCRYPT 0x0004
96 #define L2CAP_LM_TRUSTED 0x0008
97 #define L2CAP_LM_RELIABLE 0x0010
98 #define L2CAP_LM_SECURE 0x0020
99 #define L2CAP_LM_FIPS 0x0040
100
101 /* L2CAP command codes */
102 #define L2CAP_COMMAND_REJ 0x01
103 #define L2CAP_CONN_REQ 0x02
104 #define L2CAP_CONN_RSP 0x03
105 #define L2CAP_CONF_REQ 0x04
106 #define L2CAP_CONF_RSP 0x05
107 #define L2CAP_DISCONN_REQ 0x06
108 #define L2CAP_DISCONN_RSP 0x07
109 #define L2CAP_ECHO_REQ 0x08
110 #define L2CAP_ECHO_RSP 0x09
111 #define L2CAP_INFO_REQ 0x0a
112 #define L2CAP_INFO_RSP 0x0b
113 #define L2CAP_CREATE_CHAN_REQ 0x0c
114 #define L2CAP_CREATE_CHAN_RSP 0x0d
115 #define L2CAP_MOVE_CHAN_REQ 0x0e
116 #define L2CAP_MOVE_CHAN_RSP 0x0f
117 #define L2CAP_MOVE_CHAN_CFM 0x10
118 #define L2CAP_MOVE_CHAN_CFM_RSP 0x11
119 #define L2CAP_CONN_PARAM_UPDATE_REQ 0x12
120 #define L2CAP_CONN_PARAM_UPDATE_RSP 0x13
121 #define L2CAP_LE_CONN_REQ 0x14
122 #define L2CAP_LE_CONN_RSP 0x15
123 #define L2CAP_LE_CREDITS 0x16
124 #define L2CAP_ECRED_CONN_REQ 0x17
125 #define L2CAP_ECRED_CONN_RSP 0x18
126 #define L2CAP_ECRED_RECONF_REQ 0x19
127 #define L2CAP_ECRED_RECONF_RSP 0x1a
128
129 /* L2CAP extended feature mask */
130 #define L2CAP_FEAT_FLOWCTL 0x00000001
131 #define L2CAP_FEAT_RETRANS 0x00000002
132 #define L2CAP_FEAT_BIDIR_QOS 0x00000004
133 #define L2CAP_FEAT_ERTM 0x00000008
134 #define L2CAP_FEAT_STREAMING 0x00000010
135 #define L2CAP_FEAT_FCS 0x00000020
136 #define L2CAP_FEAT_EXT_FLOW 0x00000040
137 #define L2CAP_FEAT_FIXED_CHAN 0x00000080
138 #define L2CAP_FEAT_EXT_WINDOW 0x00000100
139 #define L2CAP_FEAT_UCD 0x00000200
140
141 /* L2CAP checksum option */
142 #define L2CAP_FCS_NONE 0x00
143 #define L2CAP_FCS_CRC16 0x01
144
145 /* L2CAP fixed channels */
146 #define L2CAP_FC_SIG_BREDR 0x02
147 #define L2CAP_FC_CONNLESS 0x04
148 #define L2CAP_FC_A2MP 0x08
149 #define L2CAP_FC_ATT 0x10
150 #define L2CAP_FC_SIG_LE 0x20
151 #define L2CAP_FC_SMP_LE 0x40
152 #define L2CAP_FC_SMP_BREDR 0x80
153
154 /* L2CAP Control Field bit masks */
155 #define L2CAP_CTRL_SAR 0xC000
156 #define L2CAP_CTRL_REQSEQ 0x3F00
157 #define L2CAP_CTRL_TXSEQ 0x007E
158 #define L2CAP_CTRL_SUPERVISE 0x000C
159
160 #define L2CAP_CTRL_RETRANS 0x0080
161 #define L2CAP_CTRL_FINAL 0x0080
162 #define L2CAP_CTRL_POLL 0x0010
163 #define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */
164
165 #define L2CAP_CTRL_TXSEQ_SHIFT 1
166 #define L2CAP_CTRL_SUPER_SHIFT 2
167 #define L2CAP_CTRL_POLL_SHIFT 4
168 #define L2CAP_CTRL_FINAL_SHIFT 7
169 #define L2CAP_CTRL_REQSEQ_SHIFT 8
170 #define L2CAP_CTRL_SAR_SHIFT 14
171
172 /* L2CAP Extended Control Field bit mask */
173 #define L2CAP_EXT_CTRL_TXSEQ 0xFFFC0000
174 #define L2CAP_EXT_CTRL_SAR 0x00030000
175 #define L2CAP_EXT_CTRL_SUPERVISE 0x00030000
176 #define L2CAP_EXT_CTRL_REQSEQ 0x0000FFFC
177
178 #define L2CAP_EXT_CTRL_POLL 0x00040000
179 #define L2CAP_EXT_CTRL_FINAL 0x00000002
180 #define L2CAP_EXT_CTRL_FRAME_TYPE 0x00000001 /* I- or S-Frame */
181
182 #define L2CAP_EXT_CTRL_FINAL_SHIFT 1
183 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT 2
184 #define L2CAP_EXT_CTRL_SAR_SHIFT 16
185 #define L2CAP_EXT_CTRL_SUPER_SHIFT 16
186 #define L2CAP_EXT_CTRL_POLL_SHIFT 18
187 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT 18
188
189 /* L2CAP Supervisory Function */
190 #define L2CAP_SUPER_RR 0x00
191 #define L2CAP_SUPER_REJ 0x01
192 #define L2CAP_SUPER_RNR 0x02
193 #define L2CAP_SUPER_SREJ 0x03
194
195 /* L2CAP Segmentation and Reassembly */
196 #define L2CAP_SAR_UNSEGMENTED 0x00
197 #define L2CAP_SAR_START 0x01
198 #define L2CAP_SAR_END 0x02
199 #define L2CAP_SAR_CONTINUE 0x03
200
201 /* L2CAP Command rej. reasons */
202 #define L2CAP_REJ_NOT_UNDERSTOOD 0x0000
203 #define L2CAP_REJ_MTU_EXCEEDED 0x0001
204 #define L2CAP_REJ_INVALID_CID 0x0002
205
206 /* L2CAP structures */
207 struct l2cap_hdr {
208 __le16 len;
209 __le16 cid;
210 } __packed;
211 #define L2CAP_HDR_SIZE 4
212 #define L2CAP_ENH_HDR_SIZE 6
213 #define L2CAP_EXT_HDR_SIZE 8
214
215 #define L2CAP_FCS_SIZE 2
216 #define L2CAP_SDULEN_SIZE 2
217 #define L2CAP_PSMLEN_SIZE 2
218 #define L2CAP_ENH_CTRL_SIZE 2
219 #define L2CAP_EXT_CTRL_SIZE 4
220
221 struct l2cap_cmd_hdr {
222 __u8 code;
223 __u8 ident;
224 __le16 len;
225 } __packed;
226 #define L2CAP_CMD_HDR_SIZE 4
227
228 struct l2cap_cmd_rej_unk {
229 __le16 reason;
230 } __packed;
231
232 struct l2cap_cmd_rej_mtu {
233 __le16 reason;
234 __le16 max_mtu;
235 } __packed;
236
237 struct l2cap_cmd_rej_cid {
238 __le16 reason;
239 __le16 scid;
240 __le16 dcid;
241 } __packed;
242
243 struct l2cap_conn_req {
244 __le16 psm;
245 __le16 scid;
246 } __packed;
247
248 struct l2cap_conn_rsp {
249 __le16 dcid;
250 __le16 scid;
251 __le16 result;
252 __le16 status;
253 } __packed;
254
255 /* protocol/service multiplexer (PSM) */
256 #define L2CAP_PSM_SDP 0x0001
257 #define L2CAP_PSM_RFCOMM 0x0003
258 #define L2CAP_PSM_3DSP 0x0021
259 #define L2CAP_PSM_IPSP 0x0023 /* 6LoWPAN */
260
261 #define L2CAP_PSM_DYN_START 0x1001
262 #define L2CAP_PSM_DYN_END 0xffff
263 #define L2CAP_PSM_AUTO_END 0x10ff
264 #define L2CAP_PSM_LE_DYN_START 0x0080
265 #define L2CAP_PSM_LE_DYN_END 0x00ff
266
267 /* channel identifier */
268 #define L2CAP_CID_SIGNALING 0x0001
269 #define L2CAP_CID_CONN_LESS 0x0002
270 #define L2CAP_CID_A2MP 0x0003
271 #define L2CAP_CID_ATT 0x0004
272 #define L2CAP_CID_LE_SIGNALING 0x0005
273 #define L2CAP_CID_SMP 0x0006
274 #define L2CAP_CID_SMP_BREDR 0x0007
275 #define L2CAP_CID_DYN_START 0x0040
276 #define L2CAP_CID_DYN_END 0xffff
277 #define L2CAP_CID_LE_DYN_END 0x007f
278
279 /* connect/create channel results */
280 #define L2CAP_CR_SUCCESS 0x0000
281 #define L2CAP_CR_PEND 0x0001
282 #define L2CAP_CR_BAD_PSM 0x0002
283 #define L2CAP_CR_SEC_BLOCK 0x0003
284 #define L2CAP_CR_NO_MEM 0x0004
285 #define L2CAP_CR_BAD_AMP 0x0005
286 #define L2CAP_CR_INVALID_SCID 0x0006
287 #define L2CAP_CR_SCID_IN_USE 0x0007
288
289 /* credit based connect results */
290 #define L2CAP_CR_LE_SUCCESS 0x0000
291 #define L2CAP_CR_LE_BAD_PSM 0x0002
292 #define L2CAP_CR_LE_NO_MEM 0x0004
293 #define L2CAP_CR_LE_AUTHENTICATION 0x0005
294 #define L2CAP_CR_LE_AUTHORIZATION 0x0006
295 #define L2CAP_CR_LE_BAD_KEY_SIZE 0x0007
296 #define L2CAP_CR_LE_ENCRYPTION 0x0008
297 #define L2CAP_CR_LE_INVALID_SCID 0x0009
298 #define L2CAP_CR_LE_SCID_IN_USE 0X000A
299 #define L2CAP_CR_LE_UNACCEPT_PARAMS 0X000B
300 #define L2CAP_CR_LE_INVALID_PARAMS 0X000C
301
302 /* connect/create channel status */
303 #define L2CAP_CS_NO_INFO 0x0000
304 #define L2CAP_CS_AUTHEN_PEND 0x0001
305 #define L2CAP_CS_AUTHOR_PEND 0x0002
306
307 struct l2cap_conf_req {
308 __le16 dcid;
309 __le16 flags;
310 __u8 data[];
311 } __packed;
312
313 struct l2cap_conf_rsp {
314 __le16 scid;
315 __le16 flags;
316 __le16 result;
317 __u8 data[];
318 } __packed;
319
320 #define L2CAP_CONF_SUCCESS 0x0000
321 #define L2CAP_CONF_UNACCEPT 0x0001
322 #define L2CAP_CONF_REJECT 0x0002
323 #define L2CAP_CONF_UNKNOWN 0x0003
324 #define L2CAP_CONF_PENDING 0x0004
325 #define L2CAP_CONF_EFS_REJECT 0x0005
326
327 /* configuration req/rsp continuation flag */
328 #define L2CAP_CONF_FLAG_CONTINUATION 0x0001
329
330 struct l2cap_conf_opt {
331 __u8 type;
332 __u8 len;
333 __u8 val[];
334 } __packed;
335 #define L2CAP_CONF_OPT_SIZE 2
336
337 #define L2CAP_CONF_HINT 0x80
338 #define L2CAP_CONF_MASK 0x7f
339
340 #define L2CAP_CONF_MTU 0x01
341 #define L2CAP_CONF_FLUSH_TO 0x02
342 #define L2CAP_CONF_QOS 0x03
343 #define L2CAP_CONF_RFC 0x04
344 #define L2CAP_CONF_FCS 0x05
345 #define L2CAP_CONF_EFS 0x06
346 #define L2CAP_CONF_EWS 0x07
347
348 #define L2CAP_CONF_MAX_SIZE 22
349
350 struct l2cap_conf_rfc {
351 __u8 mode;
352 __u8 txwin_size;
353 __u8 max_transmit;
354 __le16 retrans_timeout;
355 __le16 monitor_timeout;
356 __le16 max_pdu_size;
357 } __packed;
358
359 #define L2CAP_MODE_BASIC 0x00
360 #define L2CAP_MODE_RETRANS 0x01
361 #define L2CAP_MODE_FLOWCTL 0x02
362 #define L2CAP_MODE_ERTM 0x03
363 #define L2CAP_MODE_STREAMING 0x04
364
365 /* Unlike the above this one doesn't actually map to anything that would
366 * ever be sent over the air. Therefore, use a value that's unlikely to
367 * ever be used in the BR/EDR configuration phase.
368 */
369 #define L2CAP_MODE_LE_FLOWCTL 0x80
370 #define L2CAP_MODE_EXT_FLOWCTL 0x81
371
372 struct l2cap_conf_efs {
373 __u8 id;
374 __u8 stype;
375 __le16 msdu;
376 __le32 sdu_itime;
377 __le32 acc_lat;
378 __le32 flush_to;
379 } __packed;
380
381 #define L2CAP_SERV_NOTRAFIC 0x00
382 #define L2CAP_SERV_BESTEFFORT 0x01
383 #define L2CAP_SERV_GUARANTEED 0x02
384
385 #define L2CAP_BESTEFFORT_ID 0x01
386
387 struct l2cap_disconn_req {
388 __le16 dcid;
389 __le16 scid;
390 } __packed;
391
392 struct l2cap_disconn_rsp {
393 __le16 dcid;
394 __le16 scid;
395 } __packed;
396
397 struct l2cap_info_req {
398 __le16 type;
399 } __packed;
400
401 struct l2cap_info_rsp {
402 __le16 type;
403 __le16 result;
404 __u8 data[];
405 } __packed;
406
407 struct l2cap_create_chan_req {
408 __le16 psm;
409 __le16 scid;
410 __u8 amp_id;
411 } __packed;
412
413 struct l2cap_create_chan_rsp {
414 __le16 dcid;
415 __le16 scid;
416 __le16 result;
417 __le16 status;
418 } __packed;
419
420 struct l2cap_move_chan_req {
421 __le16 icid;
422 __u8 dest_amp_id;
423 } __packed;
424
425 struct l2cap_move_chan_rsp {
426 __le16 icid;
427 __le16 result;
428 } __packed;
429
430 #define L2CAP_MR_SUCCESS 0x0000
431 #define L2CAP_MR_PEND 0x0001
432 #define L2CAP_MR_BAD_ID 0x0002
433 #define L2CAP_MR_SAME_ID 0x0003
434 #define L2CAP_MR_NOT_SUPP 0x0004
435 #define L2CAP_MR_COLLISION 0x0005
436 #define L2CAP_MR_NOT_ALLOWED 0x0006
437
438 struct l2cap_move_chan_cfm {
439 __le16 icid;
440 __le16 result;
441 } __packed;
442
443 #define L2CAP_MC_CONFIRMED 0x0000
444 #define L2CAP_MC_UNCONFIRMED 0x0001
445
446 struct l2cap_move_chan_cfm_rsp {
447 __le16 icid;
448 } __packed;
449
450 /* info type */
451 #define L2CAP_IT_CL_MTU 0x0001
452 #define L2CAP_IT_FEAT_MASK 0x0002
453 #define L2CAP_IT_FIXED_CHAN 0x0003
454
455 /* info result */
456 #define L2CAP_IR_SUCCESS 0x0000
457 #define L2CAP_IR_NOTSUPP 0x0001
458
459 struct l2cap_conn_param_update_req {
460 __le16 min;
461 __le16 max;
462 __le16 latency;
463 __le16 to_multiplier;
464 } __packed;
465
466 struct l2cap_conn_param_update_rsp {
467 __le16 result;
468 } __packed;
469
470 /* Connection Parameters result */
471 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000
472 #define L2CAP_CONN_PARAM_REJECTED 0x0001
473
474 struct l2cap_le_conn_req {
475 __le16 psm;
476 __le16 scid;
477 __le16 mtu;
478 __le16 mps;
479 __le16 credits;
480 } __packed;
481
482 struct l2cap_le_conn_rsp {
483 __le16 dcid;
484 __le16 mtu;
485 __le16 mps;
486 __le16 credits;
487 __le16 result;
488 } __packed;
489
490 struct l2cap_le_credits {
491 __le16 cid;
492 __le16 credits;
493 } __packed;
494
495 #define L2CAP_ECRED_MIN_MTU 64
496 #define L2CAP_ECRED_MIN_MPS 64
497
498 struct l2cap_ecred_conn_req {
499 __le16 psm;
500 __le16 mtu;
501 __le16 mps;
502 __le16 credits;
503 __le16 scid[];
504 } __packed;
505
506 struct l2cap_ecred_conn_rsp {
507 __le16 mtu;
508 __le16 mps;
509 __le16 credits;
510 __le16 result;
511 __le16 dcid[];
512 };
513
514 struct l2cap_ecred_reconf_req {
515 __le16 mtu;
516 __le16 mps;
517 __le16 scid[];
518 } __packed;
519
520 #define L2CAP_RECONF_SUCCESS 0x0000
521 #define L2CAP_RECONF_INVALID_MTU 0x0001
522 #define L2CAP_RECONF_INVALID_MPS 0x0002
523
524 struct l2cap_ecred_reconf_rsp {
525 __le16 result;
526 } __packed;
527
528 /* ----- L2CAP channels and connections ----- */
529 struct l2cap_seq_list {
530 __u16 head;
531 __u16 tail;
532 __u16 mask;
533 __u16 *list;
534 };
535
536 #define L2CAP_SEQ_LIST_CLEAR 0xFFFF
537 #define L2CAP_SEQ_LIST_TAIL 0x8000
538
539 struct l2cap_chan {
540 struct l2cap_conn *conn;
541 struct hci_conn *hs_hcon;
542 struct hci_chan *hs_hchan;
543 struct kref kref;
544 atomic_t nesting;
545
546 __u8 state;
547
548 bdaddr_t dst;
549 __u8 dst_type;
550 bdaddr_t src;
551 __u8 src_type;
552 __le16 psm;
553 __le16 sport;
554 __u16 dcid;
555 __u16 scid;
556
557 __u16 imtu;
558 __u16 omtu;
559 __u16 flush_to;
560 __u8 mode;
561 __u8 chan_type;
562 __u8 chan_policy;
563
564 __u8 sec_level;
565
566 __u8 ident;
567
568 __u8 conf_req[64];
569 __u8 conf_len;
570 __u8 num_conf_req;
571 __u8 num_conf_rsp;
572
573 __u8 fcs;
574
575 __u16 tx_win;
576 __u16 tx_win_max;
577 __u16 ack_win;
578 __u8 max_tx;
579 __u16 retrans_timeout;
580 __u16 monitor_timeout;
581 __u16 mps;
582
583 __u16 tx_credits;
584 __u16 rx_credits;
585
586 __u8 tx_state;
587 __u8 rx_state;
588
589 unsigned long conf_state;
590 unsigned long conn_state;
591 unsigned long flags;
592
593 __u8 remote_amp_id;
594 __u8 local_amp_id;
595 __u8 move_id;
596 __u8 move_state;
597 __u8 move_role;
598
599 __u16 next_tx_seq;
600 __u16 expected_ack_seq;
601 __u16 expected_tx_seq;
602 __u16 buffer_seq;
603 __u16 srej_save_reqseq;
604 __u16 last_acked_seq;
605 __u16 frames_sent;
606 __u16 unacked_frames;
607 __u8 retry_count;
608 __u16 sdu_len;
609 struct sk_buff *sdu;
610 struct sk_buff *sdu_last_frag;
611
612 __u16 remote_tx_win;
613 __u8 remote_max_tx;
614 __u16 remote_mps;
615
616 __u8 local_id;
617 __u8 local_stype;
618 __u16 local_msdu;
619 __u32 local_sdu_itime;
620 __u32 local_acc_lat;
621 __u32 local_flush_to;
622
623 __u8 remote_id;
624 __u8 remote_stype;
625 __u16 remote_msdu;
626 __u32 remote_sdu_itime;
627 __u32 remote_acc_lat;
628 __u32 remote_flush_to;
629
630 struct delayed_work chan_timer;
631 struct delayed_work retrans_timer;
632 struct delayed_work monitor_timer;
633 struct delayed_work ack_timer;
634
635 struct sk_buff *tx_send_head;
636 struct sk_buff_head tx_q;
637 struct sk_buff_head srej_q;
638 struct l2cap_seq_list srej_list;
639 struct l2cap_seq_list retrans_list;
640
641 struct list_head list;
642 struct list_head global_l;
643
644 void *data;
645 const struct l2cap_ops *ops;
646 struct mutex lock;
647
648 ANDROID_KABI_RESERVE(1);
649 ANDROID_KABI_RESERVE(2);
650 };
651
652 struct l2cap_ops {
653 char *name;
654
655 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan);
656 int (*recv) (struct l2cap_chan * chan,
657 struct sk_buff *skb);
658 void (*teardown) (struct l2cap_chan *chan, int err);
659 void (*close) (struct l2cap_chan *chan);
660 void (*state_change) (struct l2cap_chan *chan,
661 int state, int err);
662 void (*ready) (struct l2cap_chan *chan);
663 void (*defer) (struct l2cap_chan *chan);
664 void (*resume) (struct l2cap_chan *chan);
665 void (*suspend) (struct l2cap_chan *chan);
666 void (*set_shutdown) (struct l2cap_chan *chan);
667 long (*get_sndtimeo) (struct l2cap_chan *chan);
668 struct pid *(*get_peer_pid) (struct l2cap_chan *chan);
669 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan,
670 unsigned long hdr_len,
671 unsigned long len, int nb);
672 int (*filter) (struct l2cap_chan * chan,
673 struct sk_buff *skb);
674
675 ANDROID_KABI_RESERVE(1);
676 ANDROID_KABI_RESERVE(2);
677 };
678
679 struct l2cap_conn {
680 struct hci_conn *hcon;
681 struct hci_chan *hchan;
682
683 unsigned int mtu;
684
685 __u32 feat_mask;
686 __u8 remote_fixed_chan;
687 __u8 local_fixed_chan;
688
689 __u8 info_state;
690 __u8 info_ident;
691
692 struct delayed_work info_timer;
693
694 struct sk_buff *rx_skb;
695 __u32 rx_len;
696 __u8 tx_ident;
697 struct mutex ident_lock;
698
699 struct sk_buff_head pending_rx;
700 struct work_struct pending_rx_work;
701
702 struct work_struct id_addr_update_work;
703
704 __u8 disc_reason;
705
706 struct l2cap_chan *smp;
707
708 struct list_head chan_l;
709 struct mutex chan_lock;
710 struct kref ref;
711 struct list_head users;
712
713 ANDROID_KABI_RESERVE(1);
714 ANDROID_KABI_RESERVE(2);
715 };
716
717 struct l2cap_user {
718 struct list_head list;
719 int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
720 void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
721 };
722
723 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
724 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
725 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
726
727 #define L2CAP_CHAN_RAW 1
728 #define L2CAP_CHAN_CONN_LESS 2
729 #define L2CAP_CHAN_CONN_ORIENTED 3
730 #define L2CAP_CHAN_FIXED 4
731
732 /* ----- L2CAP socket info ----- */
733 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
734
735 struct l2cap_pinfo {
736 struct bt_sock bt;
737 struct l2cap_chan *chan;
738 struct sk_buff *rx_busy_skb;
739 };
740
741 enum {
742 CONF_REQ_SENT,
743 CONF_INPUT_DONE,
744 CONF_OUTPUT_DONE,
745 CONF_MTU_DONE,
746 CONF_MODE_DONE,
747 CONF_CONNECT_PEND,
748 CONF_RECV_NO_FCS,
749 CONF_STATE2_DEVICE,
750 CONF_EWS_RECV,
751 CONF_LOC_CONF_PEND,
752 CONF_REM_CONF_PEND,
753 CONF_NOT_COMPLETE,
754 };
755
756 #define L2CAP_CONF_MAX_CONF_REQ 2
757 #define L2CAP_CONF_MAX_CONF_RSP 2
758
759 enum {
760 CONN_SREJ_SENT,
761 CONN_WAIT_F,
762 CONN_SREJ_ACT,
763 CONN_SEND_PBIT,
764 CONN_REMOTE_BUSY,
765 CONN_LOCAL_BUSY,
766 CONN_REJ_ACT,
767 CONN_SEND_FBIT,
768 CONN_RNR_SENT,
769 };
770
771 /* Definitions for flags in l2cap_chan */
772 enum {
773 FLAG_ROLE_SWITCH,
774 FLAG_FORCE_ACTIVE,
775 FLAG_FORCE_RELIABLE,
776 FLAG_FLUSHABLE,
777 FLAG_EXT_CTRL,
778 FLAG_EFS_ENABLE,
779 FLAG_DEFER_SETUP,
780 FLAG_LE_CONN_REQ_SENT,
781 FLAG_ECRED_CONN_REQ_SENT,
782 FLAG_PENDING_SECURITY,
783 FLAG_HOLD_HCI_CONN,
784 };
785
786 /* Lock nesting levels for L2CAP channels. We need these because lockdep
787 * otherwise considers all channels equal and will e.g. complain about a
788 * connection oriented channel triggering SMP procedures or a listening
789 * channel creating and locking a child channel.
790 */
791 enum {
792 L2CAP_NESTING_SMP,
793 L2CAP_NESTING_NORMAL,
794 L2CAP_NESTING_PARENT,
795 };
796
797 enum {
798 L2CAP_TX_STATE_XMIT,
799 L2CAP_TX_STATE_WAIT_F,
800 };
801
802 enum {
803 L2CAP_RX_STATE_RECV,
804 L2CAP_RX_STATE_SREJ_SENT,
805 L2CAP_RX_STATE_MOVE,
806 L2CAP_RX_STATE_WAIT_P,
807 L2CAP_RX_STATE_WAIT_F,
808 };
809
810 enum {
811 L2CAP_TXSEQ_EXPECTED,
812 L2CAP_TXSEQ_EXPECTED_SREJ,
813 L2CAP_TXSEQ_UNEXPECTED,
814 L2CAP_TXSEQ_UNEXPECTED_SREJ,
815 L2CAP_TXSEQ_DUPLICATE,
816 L2CAP_TXSEQ_DUPLICATE_SREJ,
817 L2CAP_TXSEQ_INVALID,
818 L2CAP_TXSEQ_INVALID_IGNORE,
819 };
820
821 enum {
822 L2CAP_EV_DATA_REQUEST,
823 L2CAP_EV_LOCAL_BUSY_DETECTED,
824 L2CAP_EV_LOCAL_BUSY_CLEAR,
825 L2CAP_EV_RECV_REQSEQ_AND_FBIT,
826 L2CAP_EV_RECV_FBIT,
827 L2CAP_EV_RETRANS_TO,
828 L2CAP_EV_MONITOR_TO,
829 L2CAP_EV_EXPLICIT_POLL,
830 L2CAP_EV_RECV_IFRAME,
831 L2CAP_EV_RECV_RR,
832 L2CAP_EV_RECV_REJ,
833 L2CAP_EV_RECV_RNR,
834 L2CAP_EV_RECV_SREJ,
835 L2CAP_EV_RECV_FRAME,
836 };
837
838 enum {
839 L2CAP_MOVE_ROLE_NONE,
840 L2CAP_MOVE_ROLE_INITIATOR,
841 L2CAP_MOVE_ROLE_RESPONDER,
842 };
843
844 enum {
845 L2CAP_MOVE_STABLE,
846 L2CAP_MOVE_WAIT_REQ,
847 L2CAP_MOVE_WAIT_RSP,
848 L2CAP_MOVE_WAIT_RSP_SUCCESS,
849 L2CAP_MOVE_WAIT_CONFIRM,
850 L2CAP_MOVE_WAIT_CONFIRM_RSP,
851 L2CAP_MOVE_WAIT_LOGICAL_COMP,
852 L2CAP_MOVE_WAIT_LOGICAL_CFM,
853 L2CAP_MOVE_WAIT_LOCAL_BUSY,
854 L2CAP_MOVE_WAIT_PREPARE,
855 };
856
857 void l2cap_chan_hold(struct l2cap_chan *c);
858 struct l2cap_chan *l2cap_chan_hold_unless_zero(struct l2cap_chan *c);
859 void l2cap_chan_put(struct l2cap_chan *c);
860
l2cap_chan_lock(struct l2cap_chan * chan)861 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
862 {
863 mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting));
864 }
865
l2cap_chan_unlock(struct l2cap_chan * chan)866 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
867 {
868 mutex_unlock(&chan->lock);
869 }
870
l2cap_set_timer(struct l2cap_chan * chan,struct delayed_work * work,long timeout)871 static inline void l2cap_set_timer(struct l2cap_chan *chan,
872 struct delayed_work *work, long timeout)
873 {
874 BT_DBG("chan %p state %s timeout %ld", chan,
875 state_to_string(chan->state), timeout);
876
877 /* If delayed work cancelled do not hold(chan)
878 since it is already done with previous set_timer */
879 if (!cancel_delayed_work(work))
880 l2cap_chan_hold(chan);
881
882 schedule_delayed_work(work, timeout);
883 }
884
l2cap_clear_timer(struct l2cap_chan * chan,struct delayed_work * work)885 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
886 struct delayed_work *work)
887 {
888 bool ret;
889
890 /* put(chan) if delayed work cancelled otherwise it
891 is done in delayed work function */
892 ret = cancel_delayed_work(work);
893 if (ret)
894 l2cap_chan_put(chan);
895
896 return ret;
897 }
898
899 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
900 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
901 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
902 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
903 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
904 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
905 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
906
__seq_offset(struct l2cap_chan * chan,__u16 seq1,__u16 seq2)907 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
908 {
909 if (seq1 >= seq2)
910 return seq1 - seq2;
911 else
912 return chan->tx_win_max + 1 - seq2 + seq1;
913 }
914
__next_seq(struct l2cap_chan * chan,__u16 seq)915 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
916 {
917 return (seq + 1) % (chan->tx_win_max + 1);
918 }
919
l2cap_chan_no_new_connection(struct l2cap_chan * chan)920 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
921 {
922 return NULL;
923 }
924
l2cap_chan_no_recv(struct l2cap_chan * chan,struct sk_buff * skb)925 static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
926 {
927 return -ENOSYS;
928 }
929
l2cap_chan_no_alloc_skb(struct l2cap_chan * chan,unsigned long hdr_len,unsigned long len,int nb)930 static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
931 unsigned long hdr_len,
932 unsigned long len, int nb)
933 {
934 return ERR_PTR(-ENOSYS);
935 }
936
l2cap_chan_no_teardown(struct l2cap_chan * chan,int err)937 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
938 {
939 }
940
l2cap_chan_no_close(struct l2cap_chan * chan)941 static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
942 {
943 }
944
l2cap_chan_no_ready(struct l2cap_chan * chan)945 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
946 {
947 }
948
l2cap_chan_no_state_change(struct l2cap_chan * chan,int state,int err)949 static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
950 int state, int err)
951 {
952 }
953
l2cap_chan_no_defer(struct l2cap_chan * chan)954 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
955 {
956 }
957
l2cap_chan_no_suspend(struct l2cap_chan * chan)958 static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
959 {
960 }
961
l2cap_chan_no_resume(struct l2cap_chan * chan)962 static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
963 {
964 }
965
l2cap_chan_no_set_shutdown(struct l2cap_chan * chan)966 static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
967 {
968 }
969
l2cap_chan_no_get_sndtimeo(struct l2cap_chan * chan)970 static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
971 {
972 return 0;
973 }
974
975 extern bool disable_ertm;
976 extern bool enable_ecred;
977
978 int l2cap_init_sockets(void);
979 void l2cap_cleanup_sockets(void);
980 bool l2cap_is_socket(struct socket *sock);
981
982 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
983 void __l2cap_ecred_conn_rsp_defer(struct l2cap_chan *chan);
984 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
985
986 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
987 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid);
988
989 struct l2cap_chan *l2cap_chan_create(void);
990 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
991 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
992 bdaddr_t *dst, u8 dst_type);
993 int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu);
994 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
995 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
996 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
997 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
998 int l2cap_ertm_init(struct l2cap_chan *chan);
999 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
1000 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
1001 typedef void (*l2cap_chan_func_t)(struct l2cap_chan *chan, void *data);
1002 void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func,
1003 void *data);
1004 void l2cap_chan_del(struct l2cap_chan *chan, int err);
1005 void l2cap_send_conn_req(struct l2cap_chan *chan);
1006 void l2cap_move_start(struct l2cap_chan *chan);
1007 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
1008 u8 status);
1009 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
1010
1011 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
1012 void l2cap_conn_put(struct l2cap_conn *conn);
1013
1014 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
1015 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
1016
1017 #endif /* __L2CAP_H */
1018