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 /* L2CAP socket address */
64 struct sockaddr_l2 {
65 sa_family_t l2_family;
66 __le16 l2_psm;
67 bdaddr_t l2_bdaddr;
68 __le16 l2_cid;
69 __u8 l2_bdaddr_type;
70 };
71
72 /* L2CAP socket options */
73 #define L2CAP_OPTIONS 0x01
74 struct l2cap_options {
75 __u16 omtu;
76 __u16 imtu;
77 __u16 flush_to;
78 __u8 mode;
79 __u8 fcs;
80 __u8 max_tx;
81 __u16 txwin_size;
82 };
83
84 #define L2CAP_CONNINFO 0x02
85 struct l2cap_conninfo {
86 __u16 hci_handle;
87 __u8 dev_class[3];
88 };
89
90 #define L2CAP_LM 0x03
91 #define L2CAP_LM_MASTER 0x0001
92 #define L2CAP_LM_AUTH 0x0002
93 #define L2CAP_LM_ENCRYPT 0x0004
94 #define L2CAP_LM_TRUSTED 0x0008
95 #define L2CAP_LM_RELIABLE 0x0010
96 #define L2CAP_LM_SECURE 0x0020
97 #define L2CAP_LM_FIPS 0x0040
98
99 /* L2CAP command codes */
100 #define L2CAP_COMMAND_REJ 0x01
101 #define L2CAP_CONN_REQ 0x02
102 #define L2CAP_CONN_RSP 0x03
103 #define L2CAP_CONF_REQ 0x04
104 #define L2CAP_CONF_RSP 0x05
105 #define L2CAP_DISCONN_REQ 0x06
106 #define L2CAP_DISCONN_RSP 0x07
107 #define L2CAP_ECHO_REQ 0x08
108 #define L2CAP_ECHO_RSP 0x09
109 #define L2CAP_INFO_REQ 0x0a
110 #define L2CAP_INFO_RSP 0x0b
111 #define L2CAP_CONN_PARAM_UPDATE_REQ 0x12
112 #define L2CAP_CONN_PARAM_UPDATE_RSP 0x13
113 #define L2CAP_LE_CONN_REQ 0x14
114 #define L2CAP_LE_CONN_RSP 0x15
115 #define L2CAP_LE_CREDITS 0x16
116 #define L2CAP_ECRED_CONN_REQ 0x17
117 #define L2CAP_ECRED_CONN_RSP 0x18
118 #define L2CAP_ECRED_RECONF_REQ 0x19
119 #define L2CAP_ECRED_RECONF_RSP 0x1a
120
121 /* L2CAP extended feature mask */
122 #define L2CAP_FEAT_FLOWCTL 0x00000001
123 #define L2CAP_FEAT_RETRANS 0x00000002
124 #define L2CAP_FEAT_BIDIR_QOS 0x00000004
125 #define L2CAP_FEAT_ERTM 0x00000008
126 #define L2CAP_FEAT_STREAMING 0x00000010
127 #define L2CAP_FEAT_FCS 0x00000020
128 #define L2CAP_FEAT_EXT_FLOW 0x00000040
129 #define L2CAP_FEAT_FIXED_CHAN 0x00000080
130 #define L2CAP_FEAT_EXT_WINDOW 0x00000100
131 #define L2CAP_FEAT_UCD 0x00000200
132
133 /* L2CAP checksum option */
134 #define L2CAP_FCS_NONE 0x00
135 #define L2CAP_FCS_CRC16 0x01
136
137 /* L2CAP fixed channels */
138 #define L2CAP_FC_SIG_BREDR 0x02
139 #define L2CAP_FC_CONNLESS 0x04
140 #define L2CAP_FC_ATT 0x10
141 #define L2CAP_FC_SIG_LE 0x20
142 #define L2CAP_FC_SMP_LE 0x40
143 #define L2CAP_FC_SMP_BREDR 0x80
144
145 /* L2CAP Control Field bit masks */
146 #define L2CAP_CTRL_SAR 0xC000
147 #define L2CAP_CTRL_REQSEQ 0x3F00
148 #define L2CAP_CTRL_TXSEQ 0x007E
149 #define L2CAP_CTRL_SUPERVISE 0x000C
150
151 #define L2CAP_CTRL_RETRANS 0x0080
152 #define L2CAP_CTRL_FINAL 0x0080
153 #define L2CAP_CTRL_POLL 0x0010
154 #define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */
155
156 #define L2CAP_CTRL_TXSEQ_SHIFT 1
157 #define L2CAP_CTRL_SUPER_SHIFT 2
158 #define L2CAP_CTRL_POLL_SHIFT 4
159 #define L2CAP_CTRL_FINAL_SHIFT 7
160 #define L2CAP_CTRL_REQSEQ_SHIFT 8
161 #define L2CAP_CTRL_SAR_SHIFT 14
162
163 /* L2CAP Extended Control Field bit mask */
164 #define L2CAP_EXT_CTRL_TXSEQ 0xFFFC0000
165 #define L2CAP_EXT_CTRL_SAR 0x00030000
166 #define L2CAP_EXT_CTRL_SUPERVISE 0x00030000
167 #define L2CAP_EXT_CTRL_REQSEQ 0x0000FFFC
168
169 #define L2CAP_EXT_CTRL_POLL 0x00040000
170 #define L2CAP_EXT_CTRL_FINAL 0x00000002
171 #define L2CAP_EXT_CTRL_FRAME_TYPE 0x00000001 /* I- or S-Frame */
172
173 #define L2CAP_EXT_CTRL_FINAL_SHIFT 1
174 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT 2
175 #define L2CAP_EXT_CTRL_SAR_SHIFT 16
176 #define L2CAP_EXT_CTRL_SUPER_SHIFT 16
177 #define L2CAP_EXT_CTRL_POLL_SHIFT 18
178 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT 18
179
180 /* L2CAP Supervisory Function */
181 #define L2CAP_SUPER_RR 0x00
182 #define L2CAP_SUPER_REJ 0x01
183 #define L2CAP_SUPER_RNR 0x02
184 #define L2CAP_SUPER_SREJ 0x03
185
186 /* L2CAP Segmentation and Reassembly */
187 #define L2CAP_SAR_UNSEGMENTED 0x00
188 #define L2CAP_SAR_START 0x01
189 #define L2CAP_SAR_END 0x02
190 #define L2CAP_SAR_CONTINUE 0x03
191
192 /* L2CAP Command rej. reasons */
193 #define L2CAP_REJ_NOT_UNDERSTOOD 0x0000
194 #define L2CAP_REJ_MTU_EXCEEDED 0x0001
195 #define L2CAP_REJ_INVALID_CID 0x0002
196
197 /* L2CAP structures */
198 struct l2cap_hdr {
199 __le16 len;
200 __le16 cid;
201 } __packed;
202 #define L2CAP_LEN_SIZE 2
203 #define L2CAP_HDR_SIZE 4
204 #define L2CAP_ENH_HDR_SIZE 6
205 #define L2CAP_EXT_HDR_SIZE 8
206
207 #define L2CAP_FCS_SIZE 2
208 #define L2CAP_SDULEN_SIZE 2
209 #define L2CAP_PSMLEN_SIZE 2
210 #define L2CAP_ENH_CTRL_SIZE 2
211 #define L2CAP_EXT_CTRL_SIZE 4
212
213 struct l2cap_cmd_hdr {
214 __u8 code;
215 __u8 ident;
216 __le16 len;
217 } __packed;
218 #define L2CAP_CMD_HDR_SIZE 4
219
220 struct l2cap_cmd_rej_unk {
221 __le16 reason;
222 } __packed;
223
224 struct l2cap_cmd_rej_mtu {
225 __le16 reason;
226 __le16 max_mtu;
227 } __packed;
228
229 struct l2cap_cmd_rej_cid {
230 __le16 reason;
231 __le16 scid;
232 __le16 dcid;
233 } __packed;
234
235 struct l2cap_conn_req {
236 __le16 psm;
237 __le16 scid;
238 } __packed;
239
240 struct l2cap_conn_rsp {
241 __le16 dcid;
242 __le16 scid;
243 __le16 result;
244 __le16 status;
245 } __packed;
246
247 /* protocol/service multiplexer (PSM) */
248 #define L2CAP_PSM_SDP 0x0001
249 #define L2CAP_PSM_RFCOMM 0x0003
250 #define L2CAP_PSM_3DSP 0x0021
251 #define L2CAP_PSM_IPSP 0x0023 /* 6LoWPAN */
252
253 #define L2CAP_PSM_DYN_START 0x1001
254 #define L2CAP_PSM_DYN_END 0xffff
255 #define L2CAP_PSM_AUTO_END 0x10ff
256 #define L2CAP_PSM_LE_DYN_START 0x0080
257 #define L2CAP_PSM_LE_DYN_END 0x00ff
258
259 /* channel identifier */
260 #define L2CAP_CID_SIGNALING 0x0001
261 #define L2CAP_CID_CONN_LESS 0x0002
262 #define L2CAP_CID_ATT 0x0004
263 #define L2CAP_CID_LE_SIGNALING 0x0005
264 #define L2CAP_CID_SMP 0x0006
265 #define L2CAP_CID_SMP_BREDR 0x0007
266 #define L2CAP_CID_DYN_START 0x0040
267 #define L2CAP_CID_DYN_END 0xffff
268 #define L2CAP_CID_LE_DYN_END 0x007f
269
270 /* connect/create channel results */
271 #define L2CAP_CR_SUCCESS 0x0000
272 #define L2CAP_CR_PEND 0x0001
273 #define L2CAP_CR_BAD_PSM 0x0002
274 #define L2CAP_CR_SEC_BLOCK 0x0003
275 #define L2CAP_CR_NO_MEM 0x0004
276 #define L2CAP_CR_INVALID_SCID 0x0006
277 #define L2CAP_CR_SCID_IN_USE 0x0007
278
279 /* credit based connect results */
280 #define L2CAP_CR_LE_SUCCESS 0x0000
281 #define L2CAP_CR_LE_BAD_PSM 0x0002
282 #define L2CAP_CR_LE_NO_MEM 0x0004
283 #define L2CAP_CR_LE_AUTHENTICATION 0x0005
284 #define L2CAP_CR_LE_AUTHORIZATION 0x0006
285 #define L2CAP_CR_LE_BAD_KEY_SIZE 0x0007
286 #define L2CAP_CR_LE_ENCRYPTION 0x0008
287 #define L2CAP_CR_LE_INVALID_SCID 0x0009
288 #define L2CAP_CR_LE_SCID_IN_USE 0X000A
289 #define L2CAP_CR_LE_UNACCEPT_PARAMS 0X000B
290 #define L2CAP_CR_LE_INVALID_PARAMS 0X000C
291
292 /* connect/create channel status */
293 #define L2CAP_CS_NO_INFO 0x0000
294 #define L2CAP_CS_AUTHEN_PEND 0x0001
295 #define L2CAP_CS_AUTHOR_PEND 0x0002
296
297 struct l2cap_conf_req {
298 __le16 dcid;
299 __le16 flags;
300 __u8 data[];
301 } __packed;
302
303 struct l2cap_conf_rsp {
304 __le16 scid;
305 __le16 flags;
306 __le16 result;
307 __u8 data[];
308 } __packed;
309
310 #define L2CAP_CONF_SUCCESS 0x0000
311 #define L2CAP_CONF_UNACCEPT 0x0001
312 #define L2CAP_CONF_REJECT 0x0002
313 #define L2CAP_CONF_UNKNOWN 0x0003
314 #define L2CAP_CONF_PENDING 0x0004
315 #define L2CAP_CONF_EFS_REJECT 0x0005
316
317 /* configuration req/rsp continuation flag */
318 #define L2CAP_CONF_FLAG_CONTINUATION 0x0001
319
320 struct l2cap_conf_opt {
321 __u8 type;
322 __u8 len;
323 __u8 val[];
324 } __packed;
325 #define L2CAP_CONF_OPT_SIZE 2
326
327 #define L2CAP_CONF_HINT 0x80
328 #define L2CAP_CONF_MASK 0x7f
329
330 #define L2CAP_CONF_MTU 0x01
331 #define L2CAP_CONF_FLUSH_TO 0x02
332 #define L2CAP_CONF_QOS 0x03
333 #define L2CAP_CONF_RFC 0x04
334 #define L2CAP_CONF_FCS 0x05
335 #define L2CAP_CONF_EFS 0x06
336 #define L2CAP_CONF_EWS 0x07
337
338 #define L2CAP_CONF_MAX_SIZE 22
339
340 struct l2cap_conf_rfc {
341 __u8 mode;
342 __u8 txwin_size;
343 __u8 max_transmit;
344 __le16 retrans_timeout;
345 __le16 monitor_timeout;
346 __le16 max_pdu_size;
347 } __packed;
348
349 #define L2CAP_MODE_BASIC 0x00
350 #define L2CAP_MODE_RETRANS 0x01
351 #define L2CAP_MODE_FLOWCTL 0x02
352 #define L2CAP_MODE_ERTM 0x03
353 #define L2CAP_MODE_STREAMING 0x04
354
355 /* Unlike the above this one doesn't actually map to anything that would
356 * ever be sent over the air. Therefore, use a value that's unlikely to
357 * ever be used in the BR/EDR configuration phase.
358 */
359 #define L2CAP_MODE_LE_FLOWCTL 0x80
360 #define L2CAP_MODE_EXT_FLOWCTL 0x81
361
362 struct l2cap_conf_efs {
363 __u8 id;
364 __u8 stype;
365 __le16 msdu;
366 __le32 sdu_itime;
367 __le32 acc_lat;
368 __le32 flush_to;
369 } __packed;
370
371 #define L2CAP_SERV_NOTRAFIC 0x00
372 #define L2CAP_SERV_BESTEFFORT 0x01
373 #define L2CAP_SERV_GUARANTEED 0x02
374
375 #define L2CAP_BESTEFFORT_ID 0x01
376
377 struct l2cap_disconn_req {
378 __le16 dcid;
379 __le16 scid;
380 } __packed;
381
382 struct l2cap_disconn_rsp {
383 __le16 dcid;
384 __le16 scid;
385 } __packed;
386
387 struct l2cap_info_req {
388 __le16 type;
389 } __packed;
390
391 struct l2cap_info_rsp {
392 __le16 type;
393 __le16 result;
394 __u8 data[];
395 } __packed;
396
397 #define L2CAP_MR_SUCCESS 0x0000
398 #define L2CAP_MR_PEND 0x0001
399 #define L2CAP_MR_BAD_ID 0x0002
400 #define L2CAP_MR_SAME_ID 0x0003
401 #define L2CAP_MR_NOT_SUPP 0x0004
402 #define L2CAP_MR_COLLISION 0x0005
403 #define L2CAP_MR_NOT_ALLOWED 0x0006
404
405 struct l2cap_move_chan_cfm {
406 __le16 icid;
407 __le16 result;
408 } __packed;
409
410 #define L2CAP_MC_CONFIRMED 0x0000
411 #define L2CAP_MC_UNCONFIRMED 0x0001
412
413 struct l2cap_move_chan_cfm_rsp {
414 __le16 icid;
415 } __packed;
416
417 /* info type */
418 #define L2CAP_IT_CL_MTU 0x0001
419 #define L2CAP_IT_FEAT_MASK 0x0002
420 #define L2CAP_IT_FIXED_CHAN 0x0003
421
422 /* info result */
423 #define L2CAP_IR_SUCCESS 0x0000
424 #define L2CAP_IR_NOTSUPP 0x0001
425
426 struct l2cap_conn_param_update_req {
427 __le16 min;
428 __le16 max;
429 __le16 latency;
430 __le16 to_multiplier;
431 } __packed;
432
433 struct l2cap_conn_param_update_rsp {
434 __le16 result;
435 } __packed;
436
437 /* Connection Parameters result */
438 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000
439 #define L2CAP_CONN_PARAM_REJECTED 0x0001
440
441 struct l2cap_le_conn_req {
442 __le16 psm;
443 __le16 scid;
444 __le16 mtu;
445 __le16 mps;
446 __le16 credits;
447 } __packed;
448
449 struct l2cap_le_conn_rsp {
450 __le16 dcid;
451 __le16 mtu;
452 __le16 mps;
453 __le16 credits;
454 __le16 result;
455 } __packed;
456
457 struct l2cap_le_credits {
458 __le16 cid;
459 __le16 credits;
460 } __packed;
461
462 #define L2CAP_ECRED_MIN_MTU 64
463 #define L2CAP_ECRED_MIN_MPS 64
464 #define L2CAP_ECRED_MAX_CID 5
465
466 struct l2cap_ecred_conn_req {
467 __le16 psm;
468 __le16 mtu;
469 __le16 mps;
470 __le16 credits;
471 __le16 scid[];
472 } __packed;
473
474 struct l2cap_ecred_conn_rsp {
475 __le16 mtu;
476 __le16 mps;
477 __le16 credits;
478 __le16 result;
479 __le16 dcid[];
480 };
481
482 struct l2cap_ecred_reconf_req {
483 __le16 mtu;
484 __le16 mps;
485 __le16 scid[];
486 } __packed;
487
488 #define L2CAP_RECONF_SUCCESS 0x0000
489 #define L2CAP_RECONF_INVALID_MTU 0x0001
490 #define L2CAP_RECONF_INVALID_MPS 0x0002
491
492 struct l2cap_ecred_reconf_rsp {
493 __le16 result;
494 } __packed;
495
496 /* ----- L2CAP channels and connections ----- */
497 struct l2cap_seq_list {
498 __u16 head;
499 __u16 tail;
500 __u16 mask;
501 __u16 *list;
502 };
503
504 #define L2CAP_SEQ_LIST_CLEAR 0xFFFF
505 #define L2CAP_SEQ_LIST_TAIL 0x8000
506
507 struct l2cap_chan {
508 struct l2cap_conn *conn;
509 struct kref kref;
510 atomic_t nesting;
511
512 __u8 state;
513
514 bdaddr_t dst;
515 __u8 dst_type;
516 bdaddr_t src;
517 __u8 src_type;
518 __le16 psm;
519 __le16 sport;
520 __u16 dcid;
521 __u16 scid;
522
523 __u16 imtu;
524 __u16 omtu;
525 __u16 flush_to;
526 __u8 mode;
527 __u8 chan_type;
528 __u8 chan_policy;
529
530 __u8 sec_level;
531
532 __u8 ident;
533
534 __u8 conf_req[64];
535 __u8 conf_len;
536 __u8 num_conf_req;
537 __u8 num_conf_rsp;
538
539 __u8 fcs;
540
541 __u16 tx_win;
542 __u16 tx_win_max;
543 __u16 ack_win;
544 __u8 max_tx;
545 __u16 retrans_timeout;
546 __u16 monitor_timeout;
547 __u16 mps;
548
549 __u16 tx_credits;
550 __u16 rx_credits;
551
552 /* estimated available receive buffer space or -1 if unknown */
553 ssize_t rx_avail;
554
555 __u8 tx_state;
556 __u8 rx_state;
557
558 unsigned long conf_state;
559 unsigned long conn_state;
560 unsigned long flags;
561
562 __u16 next_tx_seq;
563 __u16 expected_ack_seq;
564 __u16 expected_tx_seq;
565 __u16 buffer_seq;
566 __u16 srej_save_reqseq;
567 __u16 last_acked_seq;
568 __u16 frames_sent;
569 __u16 unacked_frames;
570 __u8 retry_count;
571 __u16 sdu_len;
572 struct sk_buff *sdu;
573 struct sk_buff *sdu_last_frag;
574
575 __u16 remote_tx_win;
576 __u8 remote_max_tx;
577 __u16 remote_mps;
578
579 __u8 local_id;
580 __u8 local_stype;
581 __u16 local_msdu;
582 __u32 local_sdu_itime;
583 __u32 local_acc_lat;
584 __u32 local_flush_to;
585
586 __u8 remote_id;
587 __u8 remote_stype;
588 __u16 remote_msdu;
589 __u32 remote_sdu_itime;
590 __u32 remote_acc_lat;
591 __u32 remote_flush_to;
592
593 struct delayed_work chan_timer;
594 struct delayed_work retrans_timer;
595 struct delayed_work monitor_timer;
596 struct delayed_work ack_timer;
597
598 struct sk_buff *tx_send_head;
599 struct sk_buff_head tx_q;
600 struct sk_buff_head srej_q;
601 struct l2cap_seq_list srej_list;
602 struct l2cap_seq_list retrans_list;
603
604 struct list_head list;
605 struct list_head global_l;
606
607 void *data;
608 const struct l2cap_ops *ops;
609 struct mutex lock;
610
611 ANDROID_KABI_RESERVE(1);
612 ANDROID_KABI_RESERVE(2);
613 };
614
615 struct l2cap_ops {
616 char *name;
617
618 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan);
619 int (*recv) (struct l2cap_chan * chan,
620 struct sk_buff *skb);
621 void (*teardown) (struct l2cap_chan *chan, int err);
622 void (*close) (struct l2cap_chan *chan);
623 void (*state_change) (struct l2cap_chan *chan,
624 int state, int err);
625 void (*ready) (struct l2cap_chan *chan);
626 void (*defer) (struct l2cap_chan *chan);
627 void (*resume) (struct l2cap_chan *chan);
628 void (*suspend) (struct l2cap_chan *chan);
629 void (*set_shutdown) (struct l2cap_chan *chan);
630 long (*get_sndtimeo) (struct l2cap_chan *chan);
631 struct pid *(*get_peer_pid) (struct l2cap_chan *chan);
632 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan,
633 unsigned long hdr_len,
634 unsigned long len, int nb);
635 int (*filter) (struct l2cap_chan * chan,
636 struct sk_buff *skb);
637
638 ANDROID_KABI_RESERVE(1);
639 ANDROID_KABI_RESERVE(2);
640 };
641
642 struct l2cap_conn {
643 struct hci_conn *hcon;
644 struct hci_chan *hchan;
645
646 unsigned int mtu;
647
648 __u32 feat_mask;
649 __u8 remote_fixed_chan;
650 __u8 local_fixed_chan;
651
652 __u8 info_state;
653 __u8 info_ident;
654
655 struct delayed_work info_timer;
656
657 struct sk_buff *rx_skb;
658 __u32 rx_len;
659 __u8 tx_ident;
660 struct mutex ident_lock;
661
662 struct sk_buff_head pending_rx;
663 struct work_struct pending_rx_work;
664
665 struct delayed_work id_addr_timer;
666
667 __u8 disc_reason;
668
669 struct l2cap_chan *smp;
670
671 struct list_head chan_l;
672 struct mutex chan_lock;
673 struct kref ref;
674 struct list_head users;
675
676 ANDROID_KABI_RESERVE(1);
677 ANDROID_KABI_RESERVE(2);
678 };
679
680 struct l2cap_user {
681 struct list_head list;
682 int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
683 void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
684 };
685
686 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
687 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
688 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
689
690 #define L2CAP_CHAN_RAW 1
691 #define L2CAP_CHAN_CONN_LESS 2
692 #define L2CAP_CHAN_CONN_ORIENTED 3
693 #define L2CAP_CHAN_FIXED 4
694
695 /* ----- L2CAP socket info ----- */
696 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
697
698 struct l2cap_rx_busy {
699 struct list_head list;
700 struct sk_buff *skb;
701 };
702
703 struct l2cap_pinfo {
704 struct bt_sock bt;
705 struct l2cap_chan *chan;
706 struct list_head rx_busy;
707 };
708
709 enum {
710 CONF_REQ_SENT,
711 CONF_INPUT_DONE,
712 CONF_OUTPUT_DONE,
713 CONF_MTU_DONE,
714 CONF_MODE_DONE,
715 CONF_CONNECT_PEND,
716 CONF_RECV_NO_FCS,
717 CONF_STATE2_DEVICE,
718 CONF_EWS_RECV,
719 CONF_LOC_CONF_PEND,
720 CONF_REM_CONF_PEND,
721 CONF_NOT_COMPLETE,
722 };
723
724 #define L2CAP_CONF_MAX_CONF_REQ 2
725 #define L2CAP_CONF_MAX_CONF_RSP 2
726
727 enum {
728 CONN_SREJ_SENT,
729 CONN_WAIT_F,
730 CONN_SREJ_ACT,
731 CONN_SEND_PBIT,
732 CONN_REMOTE_BUSY,
733 CONN_LOCAL_BUSY,
734 CONN_REJ_ACT,
735 CONN_SEND_FBIT,
736 CONN_RNR_SENT,
737 };
738
739 /* Definitions for flags in l2cap_chan */
740 enum {
741 FLAG_ROLE_SWITCH,
742 FLAG_FORCE_ACTIVE,
743 FLAG_FORCE_RELIABLE,
744 FLAG_FLUSHABLE,
745 FLAG_EXT_CTRL,
746 FLAG_EFS_ENABLE,
747 FLAG_DEFER_SETUP,
748 FLAG_LE_CONN_REQ_SENT,
749 FLAG_ECRED_CONN_REQ_SENT,
750 FLAG_PENDING_SECURITY,
751 FLAG_HOLD_HCI_CONN,
752 };
753
754 /* Lock nesting levels for L2CAP channels. We need these because lockdep
755 * otherwise considers all channels equal and will e.g. complain about a
756 * connection oriented channel triggering SMP procedures or a listening
757 * channel creating and locking a child channel.
758 */
759 enum {
760 L2CAP_NESTING_SMP,
761 L2CAP_NESTING_NORMAL,
762 L2CAP_NESTING_PARENT,
763 };
764
765 enum {
766 L2CAP_TX_STATE_XMIT,
767 L2CAP_TX_STATE_WAIT_F,
768 };
769
770 enum {
771 L2CAP_RX_STATE_RECV,
772 L2CAP_RX_STATE_SREJ_SENT,
773 L2CAP_RX_STATE_MOVE,
774 L2CAP_RX_STATE_WAIT_P,
775 L2CAP_RX_STATE_WAIT_F,
776 };
777
778 enum {
779 L2CAP_TXSEQ_EXPECTED,
780 L2CAP_TXSEQ_EXPECTED_SREJ,
781 L2CAP_TXSEQ_UNEXPECTED,
782 L2CAP_TXSEQ_UNEXPECTED_SREJ,
783 L2CAP_TXSEQ_DUPLICATE,
784 L2CAP_TXSEQ_DUPLICATE_SREJ,
785 L2CAP_TXSEQ_INVALID,
786 L2CAP_TXSEQ_INVALID_IGNORE,
787 };
788
789 enum {
790 L2CAP_EV_DATA_REQUEST,
791 L2CAP_EV_LOCAL_BUSY_DETECTED,
792 L2CAP_EV_LOCAL_BUSY_CLEAR,
793 L2CAP_EV_RECV_REQSEQ_AND_FBIT,
794 L2CAP_EV_RECV_FBIT,
795 L2CAP_EV_RETRANS_TO,
796 L2CAP_EV_MONITOR_TO,
797 L2CAP_EV_EXPLICIT_POLL,
798 L2CAP_EV_RECV_IFRAME,
799 L2CAP_EV_RECV_RR,
800 L2CAP_EV_RECV_REJ,
801 L2CAP_EV_RECV_RNR,
802 L2CAP_EV_RECV_SREJ,
803 L2CAP_EV_RECV_FRAME,
804 };
805
806 enum {
807 L2CAP_MOVE_ROLE_NONE,
808 L2CAP_MOVE_ROLE_INITIATOR,
809 L2CAP_MOVE_ROLE_RESPONDER,
810 };
811
812 enum {
813 L2CAP_MOVE_STABLE,
814 L2CAP_MOVE_WAIT_REQ,
815 L2CAP_MOVE_WAIT_RSP,
816 L2CAP_MOVE_WAIT_RSP_SUCCESS,
817 L2CAP_MOVE_WAIT_CONFIRM,
818 L2CAP_MOVE_WAIT_CONFIRM_RSP,
819 L2CAP_MOVE_WAIT_LOGICAL_COMP,
820 L2CAP_MOVE_WAIT_LOGICAL_CFM,
821 L2CAP_MOVE_WAIT_LOCAL_BUSY,
822 L2CAP_MOVE_WAIT_PREPARE,
823 };
824
825 void l2cap_chan_hold(struct l2cap_chan *c);
826 struct l2cap_chan *l2cap_chan_hold_unless_zero(struct l2cap_chan *c);
827 void l2cap_chan_put(struct l2cap_chan *c);
828
l2cap_chan_lock(struct l2cap_chan * chan)829 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
830 {
831 mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting));
832 }
833
l2cap_chan_unlock(struct l2cap_chan * chan)834 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
835 {
836 mutex_unlock(&chan->lock);
837 }
838
l2cap_set_timer(struct l2cap_chan * chan,struct delayed_work * work,long timeout)839 static inline void l2cap_set_timer(struct l2cap_chan *chan,
840 struct delayed_work *work, long timeout)
841 {
842 BT_DBG("chan %p state %s timeout %ld", chan,
843 state_to_string(chan->state), timeout);
844
845 /* If delayed work cancelled do not hold(chan)
846 since it is already done with previous set_timer */
847 if (!cancel_delayed_work(work))
848 l2cap_chan_hold(chan);
849
850 schedule_delayed_work(work, timeout);
851 }
852
l2cap_clear_timer(struct l2cap_chan * chan,struct delayed_work * work)853 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
854 struct delayed_work *work)
855 {
856 bool ret;
857
858 /* put(chan) if delayed work cancelled otherwise it
859 is done in delayed work function */
860 ret = cancel_delayed_work(work);
861 if (ret)
862 l2cap_chan_put(chan);
863
864 return ret;
865 }
866
867 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
868 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
869 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
870 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
871 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
872 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
873 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
874
__seq_offset(struct l2cap_chan * chan,__u16 seq1,__u16 seq2)875 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
876 {
877 if (seq1 >= seq2)
878 return seq1 - seq2;
879 else
880 return chan->tx_win_max + 1 - seq2 + seq1;
881 }
882
__next_seq(struct l2cap_chan * chan,__u16 seq)883 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
884 {
885 return (seq + 1) % (chan->tx_win_max + 1);
886 }
887
l2cap_chan_no_new_connection(struct l2cap_chan * chan)888 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
889 {
890 return NULL;
891 }
892
l2cap_chan_no_recv(struct l2cap_chan * chan,struct sk_buff * skb)893 static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
894 {
895 return -ENOSYS;
896 }
897
l2cap_chan_no_alloc_skb(struct l2cap_chan * chan,unsigned long hdr_len,unsigned long len,int nb)898 static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
899 unsigned long hdr_len,
900 unsigned long len, int nb)
901 {
902 return ERR_PTR(-ENOSYS);
903 }
904
l2cap_chan_no_teardown(struct l2cap_chan * chan,int err)905 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
906 {
907 }
908
l2cap_chan_no_close(struct l2cap_chan * chan)909 static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
910 {
911 }
912
l2cap_chan_no_ready(struct l2cap_chan * chan)913 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
914 {
915 }
916
l2cap_chan_no_state_change(struct l2cap_chan * chan,int state,int err)917 static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
918 int state, int err)
919 {
920 }
921
l2cap_chan_no_defer(struct l2cap_chan * chan)922 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
923 {
924 }
925
l2cap_chan_no_suspend(struct l2cap_chan * chan)926 static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
927 {
928 }
929
l2cap_chan_no_resume(struct l2cap_chan * chan)930 static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
931 {
932 }
933
l2cap_chan_no_set_shutdown(struct l2cap_chan * chan)934 static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
935 {
936 }
937
l2cap_chan_no_get_sndtimeo(struct l2cap_chan * chan)938 static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
939 {
940 return 0;
941 }
942
943 extern bool disable_ertm;
944 extern bool enable_ecred;
945
946 int l2cap_init_sockets(void);
947 void l2cap_cleanup_sockets(void);
948 bool l2cap_is_socket(struct socket *sock);
949
950 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
951 void __l2cap_ecred_conn_rsp_defer(struct l2cap_chan *chan);
952 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
953
954 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
955 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid);
956
957 struct l2cap_chan *l2cap_chan_create(void);
958 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
959 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
960 bdaddr_t *dst, u8 dst_type);
961 int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu);
962 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
963 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
964 void l2cap_chan_rx_avail(struct l2cap_chan *chan, ssize_t rx_avail);
965 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
966 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
967 int l2cap_ertm_init(struct l2cap_chan *chan);
968 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
969 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
970 typedef void (*l2cap_chan_func_t)(struct l2cap_chan *chan, void *data);
971 void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func,
972 void *data);
973 void l2cap_chan_del(struct l2cap_chan *chan, int err);
974 void l2cap_send_conn_req(struct l2cap_chan *chan);
975 void l2cap_move_start(struct l2cap_chan *chan);
976 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
977 u8 status);
978 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
979
980 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
981 void l2cap_conn_put(struct l2cap_conn *conn);
982
983 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
984 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
985
986 #endif /* __L2CAP_H */
987