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 <linux/unaligned.h>
31 #include <linux/atomic.h>
32
33 /* L2CAP defaults */
34 #define L2CAP_DEFAULT_MTU 672
35 #define L2CAP_DEFAULT_MIN_MTU 48
36 #define L2CAP_DEFAULT_FLUSH_TO 0xFFFF
37 #define L2CAP_EFS_DEFAULT_FLUSH_TO 0xFFFFFFFF
38 #define L2CAP_DEFAULT_TX_WINDOW 63
39 #define L2CAP_DEFAULT_EXT_WINDOW 0x3FFF
40 #define L2CAP_DEFAULT_MAX_TX 3
41 #define L2CAP_DEFAULT_RETRANS_TO 2 /* seconds */
42 #define L2CAP_DEFAULT_MONITOR_TO 12 /* seconds */
43 #define L2CAP_DEFAULT_MAX_PDU_SIZE 1492 /* Sized for AMP packet */
44 #define L2CAP_DEFAULT_ACK_TO 200
45 #define L2CAP_DEFAULT_MAX_SDU_SIZE 0xFFFF
46 #define L2CAP_DEFAULT_SDU_ITIME 0xFFFFFFFF
47 #define L2CAP_DEFAULT_ACC_LAT 0xFFFFFFFF
48 #define L2CAP_BREDR_MAX_PAYLOAD 1019 /* 3-DH5 packet */
49 #define L2CAP_LE_MIN_MTU 23
50 #define L2CAP_ECRED_CONN_SCID_MAX 5
51
52 #define L2CAP_DISC_TIMEOUT msecs_to_jiffies(100)
53 #define L2CAP_DISC_REJ_TIMEOUT msecs_to_jiffies(5000)
54 #define L2CAP_ENC_TIMEOUT msecs_to_jiffies(5000)
55 #define L2CAP_CONN_TIMEOUT msecs_to_jiffies(40000)
56 #define L2CAP_INFO_TIMEOUT msecs_to_jiffies(4000)
57 #define L2CAP_MOVE_TIMEOUT msecs_to_jiffies(4000)
58 #define L2CAP_MOVE_ERTX_TIMEOUT msecs_to_jiffies(60000)
59 #define L2CAP_WAIT_ACK_POLL_PERIOD msecs_to_jiffies(200)
60 #define L2CAP_WAIT_ACK_TIMEOUT msecs_to_jiffies(10000)
61
62 /* L2CAP socket address */
63 struct sockaddr_l2 {
64 sa_family_t l2_family;
65 __le16 l2_psm;
66 bdaddr_t l2_bdaddr;
67 __le16 l2_cid;
68 __u8 l2_bdaddr_type;
69 };
70
71 /* L2CAP socket options */
72 #define L2CAP_OPTIONS 0x01
73 struct l2cap_options {
74 __u16 omtu;
75 __u16 imtu;
76 __u16 flush_to;
77 __u8 mode;
78 __u8 fcs;
79 __u8 max_tx;
80 __u16 txwin_size;
81 };
82
83 #define L2CAP_CONNINFO 0x02
84 struct l2cap_conninfo {
85 __u16 hci_handle;
86 __u8 dev_class[3];
87 };
88
89 #define L2CAP_LM 0x03
90 #define L2CAP_LM_MASTER 0x0001
91 #define L2CAP_LM_AUTH 0x0002
92 #define L2CAP_LM_ENCRYPT 0x0004
93 #define L2CAP_LM_TRUSTED 0x0008
94 #define L2CAP_LM_RELIABLE 0x0010
95 #define L2CAP_LM_SECURE 0x0020
96 #define L2CAP_LM_FIPS 0x0040
97
98 /* L2CAP command codes */
99 #define L2CAP_COMMAND_REJ 0x01
100 #define L2CAP_CONN_REQ 0x02
101 #define L2CAP_CONN_RSP 0x03
102 #define L2CAP_CONF_REQ 0x04
103 #define L2CAP_CONF_RSP 0x05
104 #define L2CAP_DISCONN_REQ 0x06
105 #define L2CAP_DISCONN_RSP 0x07
106 #define L2CAP_ECHO_REQ 0x08
107 #define L2CAP_ECHO_RSP 0x09
108 #define L2CAP_INFO_REQ 0x0a
109 #define L2CAP_INFO_RSP 0x0b
110 #define L2CAP_CONN_PARAM_UPDATE_REQ 0x12
111 #define L2CAP_CONN_PARAM_UPDATE_RSP 0x13
112 #define L2CAP_LE_CONN_REQ 0x14
113 #define L2CAP_LE_CONN_RSP 0x15
114 #define L2CAP_LE_CREDITS 0x16
115 #define L2CAP_ECRED_CONN_REQ 0x17
116 #define L2CAP_ECRED_CONN_RSP 0x18
117 #define L2CAP_ECRED_RECONF_REQ 0x19
118 #define L2CAP_ECRED_RECONF_RSP 0x1a
119
120 /* L2CAP extended feature mask */
121 #define L2CAP_FEAT_FLOWCTL 0x00000001
122 #define L2CAP_FEAT_RETRANS 0x00000002
123 #define L2CAP_FEAT_BIDIR_QOS 0x00000004
124 #define L2CAP_FEAT_ERTM 0x00000008
125 #define L2CAP_FEAT_STREAMING 0x00000010
126 #define L2CAP_FEAT_FCS 0x00000020
127 #define L2CAP_FEAT_EXT_FLOW 0x00000040
128 #define L2CAP_FEAT_FIXED_CHAN 0x00000080
129 #define L2CAP_FEAT_EXT_WINDOW 0x00000100
130 #define L2CAP_FEAT_UCD 0x00000200
131
132 /* L2CAP checksum option */
133 #define L2CAP_FCS_NONE 0x00
134 #define L2CAP_FCS_CRC16 0x01
135
136 /* L2CAP fixed channels */
137 #define L2CAP_FC_SIG_BREDR 0x02
138 #define L2CAP_FC_CONNLESS 0x04
139 #define L2CAP_FC_ATT 0x10
140 #define L2CAP_FC_SIG_LE 0x20
141 #define L2CAP_FC_SMP_LE 0x40
142 #define L2CAP_FC_SMP_BREDR 0x80
143
144 /* L2CAP Control Field bit masks */
145 #define L2CAP_CTRL_SAR 0xC000
146 #define L2CAP_CTRL_REQSEQ 0x3F00
147 #define L2CAP_CTRL_TXSEQ 0x007E
148 #define L2CAP_CTRL_SUPERVISE 0x000C
149
150 #define L2CAP_CTRL_RETRANS 0x0080
151 #define L2CAP_CTRL_FINAL 0x0080
152 #define L2CAP_CTRL_POLL 0x0010
153 #define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */
154
155 #define L2CAP_CTRL_TXSEQ_SHIFT 1
156 #define L2CAP_CTRL_SUPER_SHIFT 2
157 #define L2CAP_CTRL_POLL_SHIFT 4
158 #define L2CAP_CTRL_FINAL_SHIFT 7
159 #define L2CAP_CTRL_REQSEQ_SHIFT 8
160 #define L2CAP_CTRL_SAR_SHIFT 14
161
162 /* L2CAP Extended Control Field bit mask */
163 #define L2CAP_EXT_CTRL_TXSEQ 0xFFFC0000
164 #define L2CAP_EXT_CTRL_SAR 0x00030000
165 #define L2CAP_EXT_CTRL_SUPERVISE 0x00030000
166 #define L2CAP_EXT_CTRL_REQSEQ 0x0000FFFC
167
168 #define L2CAP_EXT_CTRL_POLL 0x00040000
169 #define L2CAP_EXT_CTRL_FINAL 0x00000002
170 #define L2CAP_EXT_CTRL_FRAME_TYPE 0x00000001 /* I- or S-Frame */
171
172 #define L2CAP_EXT_CTRL_FINAL_SHIFT 1
173 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT 2
174 #define L2CAP_EXT_CTRL_SAR_SHIFT 16
175 #define L2CAP_EXT_CTRL_SUPER_SHIFT 16
176 #define L2CAP_EXT_CTRL_POLL_SHIFT 18
177 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT 18
178
179 /* L2CAP Supervisory Function */
180 #define L2CAP_SUPER_RR 0x00
181 #define L2CAP_SUPER_REJ 0x01
182 #define L2CAP_SUPER_RNR 0x02
183 #define L2CAP_SUPER_SREJ 0x03
184
185 /* L2CAP Segmentation and Reassembly */
186 #define L2CAP_SAR_UNSEGMENTED 0x00
187 #define L2CAP_SAR_START 0x01
188 #define L2CAP_SAR_END 0x02
189 #define L2CAP_SAR_CONTINUE 0x03
190
191 /* L2CAP Command rej. reasons */
192 #define L2CAP_REJ_NOT_UNDERSTOOD 0x0000
193 #define L2CAP_REJ_MTU_EXCEEDED 0x0001
194 #define L2CAP_REJ_INVALID_CID 0x0002
195
196 /* L2CAP structures */
197 struct l2cap_hdr {
198 __le16 len;
199 __le16 cid;
200 } __packed;
201 #define L2CAP_LEN_SIZE 2
202 #define L2CAP_HDR_SIZE 4
203 #define L2CAP_ENH_HDR_SIZE 6
204 #define L2CAP_EXT_HDR_SIZE 8
205
206 #define L2CAP_FCS_SIZE 2
207 #define L2CAP_SDULEN_SIZE 2
208 #define L2CAP_PSMLEN_SIZE 2
209 #define L2CAP_ENH_CTRL_SIZE 2
210 #define L2CAP_EXT_CTRL_SIZE 4
211
212 struct l2cap_cmd_hdr {
213 __u8 code;
214 __u8 ident;
215 __le16 len;
216 } __packed;
217 #define L2CAP_CMD_HDR_SIZE 4
218
219 struct l2cap_cmd_rej_unk {
220 __le16 reason;
221 } __packed;
222
223 struct l2cap_cmd_rej_mtu {
224 __le16 reason;
225 __le16 max_mtu;
226 } __packed;
227
228 struct l2cap_cmd_rej_cid {
229 __le16 reason;
230 __le16 scid;
231 __le16 dcid;
232 } __packed;
233
234 struct l2cap_conn_req {
235 __le16 psm;
236 __le16 scid;
237 } __packed;
238
239 struct l2cap_conn_rsp {
240 __le16 dcid;
241 __le16 scid;
242 __le16 result;
243 __le16 status;
244 } __packed;
245
246 /* protocol/service multiplexer (PSM) */
247 #define L2CAP_PSM_SDP 0x0001
248 #define L2CAP_PSM_RFCOMM 0x0003
249 #define L2CAP_PSM_3DSP 0x0021
250 #define L2CAP_PSM_IPSP 0x0023 /* 6LoWPAN */
251
252 #define L2CAP_PSM_DYN_START 0x1001
253 #define L2CAP_PSM_DYN_END 0xffff
254 #define L2CAP_PSM_AUTO_END 0x10ff
255 #define L2CAP_PSM_LE_DYN_START 0x0080
256 #define L2CAP_PSM_LE_DYN_END 0x00ff
257
258 /* channel identifier */
259 #define L2CAP_CID_SIGNALING 0x0001
260 #define L2CAP_CID_CONN_LESS 0x0002
261 #define L2CAP_CID_ATT 0x0004
262 #define L2CAP_CID_LE_SIGNALING 0x0005
263 #define L2CAP_CID_SMP 0x0006
264 #define L2CAP_CID_SMP_BREDR 0x0007
265 #define L2CAP_CID_DYN_START 0x0040
266 #define L2CAP_CID_DYN_END 0xffff
267 #define L2CAP_CID_LE_DYN_END 0x007f
268
269 /* connect/create channel results */
270 #define L2CAP_CR_SUCCESS 0x0000
271 #define L2CAP_CR_PEND 0x0001
272 #define L2CAP_CR_BAD_PSM 0x0002
273 #define L2CAP_CR_SEC_BLOCK 0x0003
274 #define L2CAP_CR_NO_MEM 0x0004
275 #define L2CAP_CR_INVALID_SCID 0x0006
276 #define L2CAP_CR_SCID_IN_USE 0x0007
277
278 /* credit based connect results */
279 #define L2CAP_CR_LE_SUCCESS 0x0000
280 #define L2CAP_CR_LE_BAD_PSM 0x0002
281 #define L2CAP_CR_LE_NO_MEM 0x0004
282 #define L2CAP_CR_LE_AUTHENTICATION 0x0005
283 #define L2CAP_CR_LE_AUTHORIZATION 0x0006
284 #define L2CAP_CR_LE_BAD_KEY_SIZE 0x0007
285 #define L2CAP_CR_LE_ENCRYPTION 0x0008
286 #define L2CAP_CR_LE_INVALID_SCID 0x0009
287 #define L2CAP_CR_LE_SCID_IN_USE 0X000A
288 #define L2CAP_CR_LE_UNACCEPT_PARAMS 0X000B
289 #define L2CAP_CR_LE_INVALID_PARAMS 0X000C
290
291 /* connect/create channel status */
292 #define L2CAP_CS_NO_INFO 0x0000
293 #define L2CAP_CS_AUTHEN_PEND 0x0001
294 #define L2CAP_CS_AUTHOR_PEND 0x0002
295
296 struct l2cap_conf_req {
297 __le16 dcid;
298 __le16 flags;
299 __u8 data[];
300 } __packed;
301
302 struct l2cap_conf_rsp {
303 __le16 scid;
304 __le16 flags;
305 __le16 result;
306 __u8 data[];
307 } __packed;
308
309 #define L2CAP_CONF_SUCCESS 0x0000
310 #define L2CAP_CONF_UNACCEPT 0x0001
311 #define L2CAP_CONF_REJECT 0x0002
312 #define L2CAP_CONF_UNKNOWN 0x0003
313 #define L2CAP_CONF_PENDING 0x0004
314 #define L2CAP_CONF_EFS_REJECT 0x0005
315
316 /* configuration req/rsp continuation flag */
317 #define L2CAP_CONF_FLAG_CONTINUATION 0x0001
318
319 struct l2cap_conf_opt {
320 __u8 type;
321 __u8 len;
322 __u8 val[];
323 } __packed;
324 #define L2CAP_CONF_OPT_SIZE 2
325
326 #define L2CAP_CONF_HINT 0x80
327 #define L2CAP_CONF_MASK 0x7f
328
329 #define L2CAP_CONF_MTU 0x01
330 #define L2CAP_CONF_FLUSH_TO 0x02
331 #define L2CAP_CONF_QOS 0x03
332 #define L2CAP_CONF_RFC 0x04
333 #define L2CAP_CONF_FCS 0x05
334 #define L2CAP_CONF_EFS 0x06
335 #define L2CAP_CONF_EWS 0x07
336
337 #define L2CAP_CONF_MAX_SIZE 22
338
339 struct l2cap_conf_rfc {
340 __u8 mode;
341 __u8 txwin_size;
342 __u8 max_transmit;
343 __le16 retrans_timeout;
344 __le16 monitor_timeout;
345 __le16 max_pdu_size;
346 } __packed;
347
348 #define L2CAP_MODE_BASIC 0x00
349 #define L2CAP_MODE_RETRANS 0x01
350 #define L2CAP_MODE_FLOWCTL 0x02
351 #define L2CAP_MODE_ERTM 0x03
352 #define L2CAP_MODE_STREAMING 0x04
353
354 /* Unlike the above this one doesn't actually map to anything that would
355 * ever be sent over the air. Therefore, use a value that's unlikely to
356 * ever be used in the BR/EDR configuration phase.
357 */
358 #define L2CAP_MODE_LE_FLOWCTL 0x80
359 #define L2CAP_MODE_EXT_FLOWCTL 0x81
360
361 struct l2cap_conf_efs {
362 __u8 id;
363 __u8 stype;
364 __le16 msdu;
365 __le32 sdu_itime;
366 __le32 acc_lat;
367 __le32 flush_to;
368 } __packed;
369
370 #define L2CAP_SERV_NOTRAFIC 0x00
371 #define L2CAP_SERV_BESTEFFORT 0x01
372 #define L2CAP_SERV_GUARANTEED 0x02
373
374 #define L2CAP_BESTEFFORT_ID 0x01
375
376 struct l2cap_disconn_req {
377 __le16 dcid;
378 __le16 scid;
379 } __packed;
380
381 struct l2cap_disconn_rsp {
382 __le16 dcid;
383 __le16 scid;
384 } __packed;
385
386 struct l2cap_info_req {
387 __le16 type;
388 } __packed;
389
390 struct l2cap_info_rsp {
391 __le16 type;
392 __le16 result;
393 __u8 data[];
394 } __packed;
395
396 #define L2CAP_MR_SUCCESS 0x0000
397 #define L2CAP_MR_PEND 0x0001
398 #define L2CAP_MR_BAD_ID 0x0002
399 #define L2CAP_MR_SAME_ID 0x0003
400 #define L2CAP_MR_NOT_SUPP 0x0004
401 #define L2CAP_MR_COLLISION 0x0005
402 #define L2CAP_MR_NOT_ALLOWED 0x0006
403
404 struct l2cap_move_chan_cfm {
405 __le16 icid;
406 __le16 result;
407 } __packed;
408
409 #define L2CAP_MC_CONFIRMED 0x0000
410 #define L2CAP_MC_UNCONFIRMED 0x0001
411
412 struct l2cap_move_chan_cfm_rsp {
413 __le16 icid;
414 } __packed;
415
416 /* info type */
417 #define L2CAP_IT_CL_MTU 0x0001
418 #define L2CAP_IT_FEAT_MASK 0x0002
419 #define L2CAP_IT_FIXED_CHAN 0x0003
420
421 /* info result */
422 #define L2CAP_IR_SUCCESS 0x0000
423 #define L2CAP_IR_NOTSUPP 0x0001
424
425 struct l2cap_conn_param_update_req {
426 __le16 min;
427 __le16 max;
428 __le16 latency;
429 __le16 to_multiplier;
430 } __packed;
431
432 struct l2cap_conn_param_update_rsp {
433 __le16 result;
434 } __packed;
435
436 /* Connection Parameters result */
437 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000
438 #define L2CAP_CONN_PARAM_REJECTED 0x0001
439
440 struct l2cap_le_conn_req {
441 __le16 psm;
442 __le16 scid;
443 __le16 mtu;
444 __le16 mps;
445 __le16 credits;
446 } __packed;
447
448 struct l2cap_le_conn_rsp {
449 __le16 dcid;
450 __le16 mtu;
451 __le16 mps;
452 __le16 credits;
453 __le16 result;
454 } __packed;
455
456 struct l2cap_le_credits {
457 __le16 cid;
458 __le16 credits;
459 } __packed;
460
461 #define L2CAP_ECRED_MIN_MTU 64
462 #define L2CAP_ECRED_MIN_MPS 64
463 #define L2CAP_ECRED_MAX_CID 5
464
465 struct l2cap_ecred_conn_req {
466 /* New members must be added within the struct_group() macro below. */
467 __struct_group(l2cap_ecred_conn_req_hdr, hdr, __packed,
468 __le16 psm;
469 __le16 mtu;
470 __le16 mps;
471 __le16 credits;
472 );
473 __le16 scid[];
474 } __packed;
475
476 struct l2cap_ecred_conn_rsp {
477 /* New members must be added within the struct_group() macro below. */
478 struct_group_tagged(l2cap_ecred_conn_rsp_hdr, hdr,
479 __le16 mtu;
480 __le16 mps;
481 __le16 credits;
482 __le16 result;
483 );
484 __le16 dcid[];
485 };
486
487 struct l2cap_ecred_reconf_req {
488 __le16 mtu;
489 __le16 mps;
490 __le16 scid[];
491 } __packed;
492
493 #define L2CAP_RECONF_SUCCESS 0x0000
494 #define L2CAP_RECONF_INVALID_MTU 0x0001
495 #define L2CAP_RECONF_INVALID_MPS 0x0002
496
497 struct l2cap_ecred_reconf_rsp {
498 __le16 result;
499 } __packed;
500
501 /* ----- L2CAP channels and connections ----- */
502 struct l2cap_seq_list {
503 __u16 head;
504 __u16 tail;
505 __u16 mask;
506 __u16 *list;
507 };
508
509 #define L2CAP_SEQ_LIST_CLEAR 0xFFFF
510 #define L2CAP_SEQ_LIST_TAIL 0x8000
511
512 struct l2cap_chan {
513 struct l2cap_conn *conn;
514 struct kref kref;
515 atomic_t nesting;
516
517 __u8 state;
518
519 bdaddr_t dst;
520 __u8 dst_type;
521 bdaddr_t src;
522 __u8 src_type;
523 __le16 psm;
524 __le16 sport;
525 __u16 dcid;
526 __u16 scid;
527
528 __u16 imtu;
529 __u16 omtu;
530 __u16 flush_to;
531 __u8 mode;
532 __u8 chan_type;
533 __u8 chan_policy;
534
535 __u8 sec_level;
536
537 __u8 ident;
538
539 __u8 conf_req[64];
540 __u8 conf_len;
541 __u8 num_conf_req;
542 __u8 num_conf_rsp;
543
544 __u8 fcs;
545
546 __u16 tx_win;
547 __u16 tx_win_max;
548 __u16 ack_win;
549 __u8 max_tx;
550 __u16 retrans_timeout;
551 __u16 monitor_timeout;
552 __u16 mps;
553
554 __u16 tx_credits;
555 __u16 rx_credits;
556
557 /* estimated available receive buffer space or -1 if unknown */
558 ssize_t rx_avail;
559
560 __u8 tx_state;
561 __u8 rx_state;
562
563 unsigned long conf_state;
564 unsigned long conn_state;
565 unsigned long flags;
566
567 __u16 next_tx_seq;
568 __u16 expected_ack_seq;
569 __u16 expected_tx_seq;
570 __u16 buffer_seq;
571 __u16 srej_save_reqseq;
572 __u16 last_acked_seq;
573 __u16 frames_sent;
574 __u16 unacked_frames;
575 __u8 retry_count;
576 __u16 sdu_len;
577 struct sk_buff *sdu;
578 struct sk_buff *sdu_last_frag;
579
580 __u16 remote_tx_win;
581 __u8 remote_max_tx;
582 __u16 remote_mps;
583
584 __u8 local_id;
585 __u8 local_stype;
586 __u16 local_msdu;
587 __u32 local_sdu_itime;
588 __u32 local_acc_lat;
589 __u32 local_flush_to;
590
591 __u8 remote_id;
592 __u8 remote_stype;
593 __u16 remote_msdu;
594 __u32 remote_sdu_itime;
595 __u32 remote_acc_lat;
596 __u32 remote_flush_to;
597
598 struct delayed_work chan_timer;
599 struct delayed_work retrans_timer;
600 struct delayed_work monitor_timer;
601 struct delayed_work ack_timer;
602
603 struct sk_buff *tx_send_head;
604 struct sk_buff_head tx_q;
605 struct sk_buff_head srej_q;
606 struct l2cap_seq_list srej_list;
607 struct l2cap_seq_list retrans_list;
608
609 struct list_head list;
610 struct list_head global_l;
611
612 void *data;
613 const struct l2cap_ops *ops;
614 struct mutex lock;
615 };
616
617 struct l2cap_ops {
618 char *name;
619
620 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan);
621 int (*recv) (struct l2cap_chan * chan,
622 struct sk_buff *skb);
623 void (*teardown) (struct l2cap_chan *chan, int err);
624 void (*close) (struct l2cap_chan *chan);
625 void (*state_change) (struct l2cap_chan *chan,
626 int state, int err);
627 void (*ready) (struct l2cap_chan *chan);
628 void (*defer) (struct l2cap_chan *chan);
629 void (*resume) (struct l2cap_chan *chan);
630 void (*suspend) (struct l2cap_chan *chan);
631 void (*set_shutdown) (struct l2cap_chan *chan);
632 long (*get_sndtimeo) (struct l2cap_chan *chan);
633 struct pid *(*get_peer_pid) (struct l2cap_chan *chan);
634 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan,
635 unsigned long hdr_len,
636 unsigned long len, int nb);
637 int (*filter) (struct l2cap_chan * chan,
638 struct sk_buff *skb);
639 };
640
641 struct l2cap_conn {
642 struct hci_conn *hcon;
643 struct hci_chan *hchan;
644
645 unsigned int mtu;
646
647 __u32 feat_mask;
648 __u8 remote_fixed_chan;
649 __u8 local_fixed_chan;
650
651 __u8 info_state;
652 __u8 info_ident;
653
654 struct delayed_work info_timer;
655
656 struct sk_buff *rx_skb;
657 __u32 rx_len;
658 __u8 tx_ident;
659 struct mutex ident_lock;
660
661 struct sk_buff_head pending_rx;
662 struct work_struct pending_rx_work;
663
664 struct delayed_work id_addr_timer;
665
666 __u8 disc_reason;
667
668 struct l2cap_chan *smp;
669
670 struct list_head chan_l;
671 struct mutex lock;
672 struct kref ref;
673 struct list_head users;
674 };
675
676 struct l2cap_user {
677 struct list_head list;
678 int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
679 void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
680 };
681
682 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
683 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
684 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
685
686 #define L2CAP_CHAN_RAW 1
687 #define L2CAP_CHAN_CONN_LESS 2
688 #define L2CAP_CHAN_CONN_ORIENTED 3
689 #define L2CAP_CHAN_FIXED 4
690
691 /* ----- L2CAP socket info ----- */
692 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
693
694 struct l2cap_rx_busy {
695 struct list_head list;
696 struct sk_buff *skb;
697 };
698
699 struct l2cap_pinfo {
700 struct bt_sock bt;
701 struct l2cap_chan *chan;
702 struct list_head rx_busy;
703 };
704
705 enum {
706 CONF_REQ_SENT,
707 CONF_INPUT_DONE,
708 CONF_OUTPUT_DONE,
709 CONF_MTU_DONE,
710 CONF_MODE_DONE,
711 CONF_CONNECT_PEND,
712 CONF_RECV_NO_FCS,
713 CONF_STATE2_DEVICE,
714 CONF_EWS_RECV,
715 CONF_LOC_CONF_PEND,
716 CONF_REM_CONF_PEND,
717 CONF_NOT_COMPLETE,
718 };
719
720 #define L2CAP_CONF_MAX_CONF_REQ 2
721 #define L2CAP_CONF_MAX_CONF_RSP 2
722
723 enum {
724 CONN_SREJ_SENT,
725 CONN_WAIT_F,
726 CONN_SREJ_ACT,
727 CONN_SEND_PBIT,
728 CONN_REMOTE_BUSY,
729 CONN_LOCAL_BUSY,
730 CONN_REJ_ACT,
731 CONN_SEND_FBIT,
732 CONN_RNR_SENT,
733 };
734
735 /* Definitions for flags in l2cap_chan */
736 enum {
737 FLAG_ROLE_SWITCH,
738 FLAG_FORCE_ACTIVE,
739 FLAG_FORCE_RELIABLE,
740 FLAG_FLUSHABLE,
741 FLAG_EXT_CTRL,
742 FLAG_EFS_ENABLE,
743 FLAG_DEFER_SETUP,
744 FLAG_LE_CONN_REQ_SENT,
745 FLAG_ECRED_CONN_REQ_SENT,
746 FLAG_PENDING_SECURITY,
747 FLAG_HOLD_HCI_CONN,
748 };
749
750 /* Lock nesting levels for L2CAP channels. We need these because lockdep
751 * otherwise considers all channels equal and will e.g. complain about a
752 * connection oriented channel triggering SMP procedures or a listening
753 * channel creating and locking a child channel.
754 */
755 enum {
756 L2CAP_NESTING_SMP,
757 L2CAP_NESTING_NORMAL,
758 L2CAP_NESTING_PARENT,
759 };
760
761 enum {
762 L2CAP_TX_STATE_XMIT,
763 L2CAP_TX_STATE_WAIT_F,
764 };
765
766 enum {
767 L2CAP_RX_STATE_RECV,
768 L2CAP_RX_STATE_SREJ_SENT,
769 L2CAP_RX_STATE_MOVE,
770 L2CAP_RX_STATE_WAIT_P,
771 L2CAP_RX_STATE_WAIT_F,
772 };
773
774 enum {
775 L2CAP_TXSEQ_EXPECTED,
776 L2CAP_TXSEQ_EXPECTED_SREJ,
777 L2CAP_TXSEQ_UNEXPECTED,
778 L2CAP_TXSEQ_UNEXPECTED_SREJ,
779 L2CAP_TXSEQ_DUPLICATE,
780 L2CAP_TXSEQ_DUPLICATE_SREJ,
781 L2CAP_TXSEQ_INVALID,
782 L2CAP_TXSEQ_INVALID_IGNORE,
783 };
784
785 enum {
786 L2CAP_EV_DATA_REQUEST,
787 L2CAP_EV_LOCAL_BUSY_DETECTED,
788 L2CAP_EV_LOCAL_BUSY_CLEAR,
789 L2CAP_EV_RECV_REQSEQ_AND_FBIT,
790 L2CAP_EV_RECV_FBIT,
791 L2CAP_EV_RETRANS_TO,
792 L2CAP_EV_MONITOR_TO,
793 L2CAP_EV_EXPLICIT_POLL,
794 L2CAP_EV_RECV_IFRAME,
795 L2CAP_EV_RECV_RR,
796 L2CAP_EV_RECV_REJ,
797 L2CAP_EV_RECV_RNR,
798 L2CAP_EV_RECV_SREJ,
799 L2CAP_EV_RECV_FRAME,
800 };
801
802 enum {
803 L2CAP_MOVE_ROLE_NONE,
804 L2CAP_MOVE_ROLE_INITIATOR,
805 L2CAP_MOVE_ROLE_RESPONDER,
806 };
807
808 enum {
809 L2CAP_MOVE_STABLE,
810 L2CAP_MOVE_WAIT_REQ,
811 L2CAP_MOVE_WAIT_RSP,
812 L2CAP_MOVE_WAIT_RSP_SUCCESS,
813 L2CAP_MOVE_WAIT_CONFIRM,
814 L2CAP_MOVE_WAIT_CONFIRM_RSP,
815 L2CAP_MOVE_WAIT_LOGICAL_COMP,
816 L2CAP_MOVE_WAIT_LOGICAL_CFM,
817 L2CAP_MOVE_WAIT_LOCAL_BUSY,
818 L2CAP_MOVE_WAIT_PREPARE,
819 };
820
821 void l2cap_chan_hold(struct l2cap_chan *c);
822 struct l2cap_chan *l2cap_chan_hold_unless_zero(struct l2cap_chan *c);
823 void l2cap_chan_put(struct l2cap_chan *c);
824
l2cap_chan_lock(struct l2cap_chan * chan)825 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
826 {
827 mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting));
828 }
829
l2cap_chan_unlock(struct l2cap_chan * chan)830 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
831 {
832 mutex_unlock(&chan->lock);
833 }
834
l2cap_set_timer(struct l2cap_chan * chan,struct delayed_work * work,long timeout)835 static inline void l2cap_set_timer(struct l2cap_chan *chan,
836 struct delayed_work *work, long timeout)
837 {
838 BT_DBG("chan %p state %s timeout %ld", chan,
839 state_to_string(chan->state), timeout);
840
841 /* If delayed work cancelled do not hold(chan)
842 since it is already done with previous set_timer */
843 if (!cancel_delayed_work(work))
844 l2cap_chan_hold(chan);
845
846 schedule_delayed_work(work, timeout);
847 }
848
l2cap_clear_timer(struct l2cap_chan * chan,struct delayed_work * work)849 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
850 struct delayed_work *work)
851 {
852 bool ret;
853
854 /* put(chan) if delayed work cancelled otherwise it
855 is done in delayed work function */
856 ret = cancel_delayed_work(work);
857 if (ret)
858 l2cap_chan_put(chan);
859
860 return ret;
861 }
862
863 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
864 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
865 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
866 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
867 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
868 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
869 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
870
__seq_offset(struct l2cap_chan * chan,__u16 seq1,__u16 seq2)871 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
872 {
873 if (seq1 >= seq2)
874 return seq1 - seq2;
875 else
876 return chan->tx_win_max + 1 - seq2 + seq1;
877 }
878
__next_seq(struct l2cap_chan * chan,__u16 seq)879 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
880 {
881 return (seq + 1) % (chan->tx_win_max + 1);
882 }
883
l2cap_chan_no_new_connection(struct l2cap_chan * chan)884 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
885 {
886 return NULL;
887 }
888
l2cap_chan_no_recv(struct l2cap_chan * chan,struct sk_buff * skb)889 static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
890 {
891 return -ENOSYS;
892 }
893
l2cap_chan_no_alloc_skb(struct l2cap_chan * chan,unsigned long hdr_len,unsigned long len,int nb)894 static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
895 unsigned long hdr_len,
896 unsigned long len, int nb)
897 {
898 return ERR_PTR(-ENOSYS);
899 }
900
l2cap_chan_no_teardown(struct l2cap_chan * chan,int err)901 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
902 {
903 }
904
l2cap_chan_no_close(struct l2cap_chan * chan)905 static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
906 {
907 }
908
l2cap_chan_no_ready(struct l2cap_chan * chan)909 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
910 {
911 }
912
l2cap_chan_no_state_change(struct l2cap_chan * chan,int state,int err)913 static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
914 int state, int err)
915 {
916 }
917
l2cap_chan_no_defer(struct l2cap_chan * chan)918 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
919 {
920 }
921
l2cap_chan_no_suspend(struct l2cap_chan * chan)922 static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
923 {
924 }
925
l2cap_chan_no_resume(struct l2cap_chan * chan)926 static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
927 {
928 }
929
l2cap_chan_no_set_shutdown(struct l2cap_chan * chan)930 static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
931 {
932 }
933
l2cap_chan_no_get_sndtimeo(struct l2cap_chan * chan)934 static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
935 {
936 return 0;
937 }
938
939 extern bool disable_ertm;
940 extern bool enable_ecred;
941
942 int l2cap_init_sockets(void);
943 void l2cap_cleanup_sockets(void);
944 bool l2cap_is_socket(struct socket *sock);
945
946 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
947 void __l2cap_ecred_conn_rsp_defer(struct l2cap_chan *chan);
948 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
949
950 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
951 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid);
952
953 struct l2cap_chan *l2cap_chan_create(void);
954 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
955 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
956 bdaddr_t *dst, u8 dst_type, u16 timeout);
957 int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu);
958 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
959 const struct sockcm_cookie *sockc);
960 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
961 void l2cap_chan_rx_avail(struct l2cap_chan *chan, ssize_t rx_avail);
962 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
963 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
964 int l2cap_ertm_init(struct l2cap_chan *chan);
965 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
966 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
967 typedef void (*l2cap_chan_func_t)(struct l2cap_chan *chan, void *data);
968 void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func,
969 void *data);
970 void l2cap_chan_del(struct l2cap_chan *chan, int err);
971 void l2cap_send_conn_req(struct l2cap_chan *chan);
972
973 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
974 struct l2cap_conn *l2cap_conn_hold_unless_zero(struct l2cap_conn *conn);
975 void l2cap_conn_put(struct l2cap_conn *conn);
976
977 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
978 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
979
980 #endif /* __L2CAP_H */
981