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
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 2000 /* 2 seconds */
42 #define L2CAP_DEFAULT_MONITOR_TO 12000 /* 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 __le16 psm;
467 __le16 mtu;
468 __le16 mps;
469 __le16 credits;
470 __le16 scid[];
471 } __packed;
472
473 struct l2cap_ecred_conn_rsp {
474 __le16 mtu;
475 __le16 mps;
476 __le16 credits;
477 __le16 result;
478 __le16 dcid[];
479 };
480
481 struct l2cap_ecred_reconf_req {
482 __le16 mtu;
483 __le16 mps;
484 __le16 scid[];
485 } __packed;
486
487 #define L2CAP_RECONF_SUCCESS 0x0000
488 #define L2CAP_RECONF_INVALID_MTU 0x0001
489 #define L2CAP_RECONF_INVALID_MPS 0x0002
490
491 struct l2cap_ecred_reconf_rsp {
492 __le16 result;
493 } __packed;
494
495 /* ----- L2CAP channels and connections ----- */
496 struct l2cap_seq_list {
497 __u16 head;
498 __u16 tail;
499 __u16 mask;
500 __u16 *list;
501 };
502
503 #define L2CAP_SEQ_LIST_CLEAR 0xFFFF
504 #define L2CAP_SEQ_LIST_TAIL 0x8000
505
506 struct l2cap_chan {
507 struct l2cap_conn *conn;
508 struct kref kref;
509 atomic_t nesting;
510
511 __u8 state;
512
513 bdaddr_t dst;
514 __u8 dst_type;
515 bdaddr_t src;
516 __u8 src_type;
517 __le16 psm;
518 __le16 sport;
519 __u16 dcid;
520 __u16 scid;
521
522 __u16 imtu;
523 __u16 omtu;
524 __u16 flush_to;
525 __u8 mode;
526 __u8 chan_type;
527 __u8 chan_policy;
528
529 __u8 sec_level;
530
531 __u8 ident;
532
533 __u8 conf_req[64];
534 __u8 conf_len;
535 __u8 num_conf_req;
536 __u8 num_conf_rsp;
537
538 __u8 fcs;
539
540 __u16 tx_win;
541 __u16 tx_win_max;
542 __u16 ack_win;
543 __u8 max_tx;
544 __u16 retrans_timeout;
545 __u16 monitor_timeout;
546 __u16 mps;
547
548 __u16 tx_credits;
549 __u16 rx_credits;
550
551 /* estimated available receive buffer space or -1 if unknown */
552 ssize_t rx_avail;
553
554 __u8 tx_state;
555 __u8 rx_state;
556
557 unsigned long conf_state;
558 unsigned long conn_state;
559 unsigned long flags;
560
561 __u16 next_tx_seq;
562 __u16 expected_ack_seq;
563 __u16 expected_tx_seq;
564 __u16 buffer_seq;
565 __u16 srej_save_reqseq;
566 __u16 last_acked_seq;
567 __u16 frames_sent;
568 __u16 unacked_frames;
569 __u8 retry_count;
570 __u16 sdu_len;
571 struct sk_buff *sdu;
572 struct sk_buff *sdu_last_frag;
573
574 __u16 remote_tx_win;
575 __u8 remote_max_tx;
576 __u16 remote_mps;
577
578 __u8 local_id;
579 __u8 local_stype;
580 __u16 local_msdu;
581 __u32 local_sdu_itime;
582 __u32 local_acc_lat;
583 __u32 local_flush_to;
584
585 __u8 remote_id;
586 __u8 remote_stype;
587 __u16 remote_msdu;
588 __u32 remote_sdu_itime;
589 __u32 remote_acc_lat;
590 __u32 remote_flush_to;
591
592 struct delayed_work chan_timer;
593 struct delayed_work retrans_timer;
594 struct delayed_work monitor_timer;
595 struct delayed_work ack_timer;
596
597 struct sk_buff *tx_send_head;
598 struct sk_buff_head tx_q;
599 struct sk_buff_head srej_q;
600 struct l2cap_seq_list srej_list;
601 struct l2cap_seq_list retrans_list;
602
603 struct list_head list;
604 struct list_head global_l;
605
606 void *data;
607 const struct l2cap_ops *ops;
608 struct mutex lock;
609 };
610
611 struct l2cap_ops {
612 char *name;
613
614 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan);
615 int (*recv) (struct l2cap_chan * chan,
616 struct sk_buff *skb);
617 void (*teardown) (struct l2cap_chan *chan, int err);
618 void (*close) (struct l2cap_chan *chan);
619 void (*state_change) (struct l2cap_chan *chan,
620 int state, int err);
621 void (*ready) (struct l2cap_chan *chan);
622 void (*defer) (struct l2cap_chan *chan);
623 void (*resume) (struct l2cap_chan *chan);
624 void (*suspend) (struct l2cap_chan *chan);
625 void (*set_shutdown) (struct l2cap_chan *chan);
626 long (*get_sndtimeo) (struct l2cap_chan *chan);
627 struct pid *(*get_peer_pid) (struct l2cap_chan *chan);
628 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan,
629 unsigned long hdr_len,
630 unsigned long len, int nb);
631 int (*filter) (struct l2cap_chan * chan,
632 struct sk_buff *skb);
633 };
634
635 struct l2cap_conn {
636 struct hci_conn *hcon;
637 struct hci_chan *hchan;
638
639 unsigned int mtu;
640
641 __u32 feat_mask;
642 __u8 remote_fixed_chan;
643 __u8 local_fixed_chan;
644
645 __u8 info_state;
646 __u8 info_ident;
647
648 struct delayed_work info_timer;
649
650 struct sk_buff *rx_skb;
651 __u32 rx_len;
652 __u8 tx_ident;
653 struct mutex ident_lock;
654
655 struct sk_buff_head pending_rx;
656 struct work_struct pending_rx_work;
657
658 struct delayed_work id_addr_timer;
659
660 __u8 disc_reason;
661
662 struct l2cap_chan *smp;
663
664 struct list_head chan_l;
665 struct mutex chan_lock;
666 struct kref ref;
667 struct list_head users;
668 };
669
670 struct l2cap_user {
671 struct list_head list;
672 int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
673 void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
674 };
675
676 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
677 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
678 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
679
680 #define L2CAP_CHAN_RAW 1
681 #define L2CAP_CHAN_CONN_LESS 2
682 #define L2CAP_CHAN_CONN_ORIENTED 3
683 #define L2CAP_CHAN_FIXED 4
684
685 /* ----- L2CAP socket info ----- */
686 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
687
688 struct l2cap_rx_busy {
689 struct list_head list;
690 struct sk_buff *skb;
691 };
692
693 struct l2cap_pinfo {
694 struct bt_sock bt;
695 struct l2cap_chan *chan;
696 struct list_head rx_busy;
697 };
698
699 enum {
700 CONF_REQ_SENT,
701 CONF_INPUT_DONE,
702 CONF_OUTPUT_DONE,
703 CONF_MTU_DONE,
704 CONF_MODE_DONE,
705 CONF_CONNECT_PEND,
706 CONF_RECV_NO_FCS,
707 CONF_STATE2_DEVICE,
708 CONF_EWS_RECV,
709 CONF_LOC_CONF_PEND,
710 CONF_REM_CONF_PEND,
711 CONF_NOT_COMPLETE,
712 };
713
714 #define L2CAP_CONF_MAX_CONF_REQ 2
715 #define L2CAP_CONF_MAX_CONF_RSP 2
716
717 enum {
718 CONN_SREJ_SENT,
719 CONN_WAIT_F,
720 CONN_SREJ_ACT,
721 CONN_SEND_PBIT,
722 CONN_REMOTE_BUSY,
723 CONN_LOCAL_BUSY,
724 CONN_REJ_ACT,
725 CONN_SEND_FBIT,
726 CONN_RNR_SENT,
727 };
728
729 /* Definitions for flags in l2cap_chan */
730 enum {
731 FLAG_ROLE_SWITCH,
732 FLAG_FORCE_ACTIVE,
733 FLAG_FORCE_RELIABLE,
734 FLAG_FLUSHABLE,
735 FLAG_EXT_CTRL,
736 FLAG_EFS_ENABLE,
737 FLAG_DEFER_SETUP,
738 FLAG_LE_CONN_REQ_SENT,
739 FLAG_ECRED_CONN_REQ_SENT,
740 FLAG_PENDING_SECURITY,
741 FLAG_HOLD_HCI_CONN,
742 };
743
744 /* Lock nesting levels for L2CAP channels. We need these because lockdep
745 * otherwise considers all channels equal and will e.g. complain about a
746 * connection oriented channel triggering SMP procedures or a listening
747 * channel creating and locking a child channel.
748 */
749 enum {
750 L2CAP_NESTING_SMP,
751 L2CAP_NESTING_NORMAL,
752 L2CAP_NESTING_PARENT,
753 };
754
755 enum {
756 L2CAP_TX_STATE_XMIT,
757 L2CAP_TX_STATE_WAIT_F,
758 };
759
760 enum {
761 L2CAP_RX_STATE_RECV,
762 L2CAP_RX_STATE_SREJ_SENT,
763 L2CAP_RX_STATE_MOVE,
764 L2CAP_RX_STATE_WAIT_P,
765 L2CAP_RX_STATE_WAIT_F,
766 };
767
768 enum {
769 L2CAP_TXSEQ_EXPECTED,
770 L2CAP_TXSEQ_EXPECTED_SREJ,
771 L2CAP_TXSEQ_UNEXPECTED,
772 L2CAP_TXSEQ_UNEXPECTED_SREJ,
773 L2CAP_TXSEQ_DUPLICATE,
774 L2CAP_TXSEQ_DUPLICATE_SREJ,
775 L2CAP_TXSEQ_INVALID,
776 L2CAP_TXSEQ_INVALID_IGNORE,
777 };
778
779 enum {
780 L2CAP_EV_DATA_REQUEST,
781 L2CAP_EV_LOCAL_BUSY_DETECTED,
782 L2CAP_EV_LOCAL_BUSY_CLEAR,
783 L2CAP_EV_RECV_REQSEQ_AND_FBIT,
784 L2CAP_EV_RECV_FBIT,
785 L2CAP_EV_RETRANS_TO,
786 L2CAP_EV_MONITOR_TO,
787 L2CAP_EV_EXPLICIT_POLL,
788 L2CAP_EV_RECV_IFRAME,
789 L2CAP_EV_RECV_RR,
790 L2CAP_EV_RECV_REJ,
791 L2CAP_EV_RECV_RNR,
792 L2CAP_EV_RECV_SREJ,
793 L2CAP_EV_RECV_FRAME,
794 };
795
796 enum {
797 L2CAP_MOVE_ROLE_NONE,
798 L2CAP_MOVE_ROLE_INITIATOR,
799 L2CAP_MOVE_ROLE_RESPONDER,
800 };
801
802 enum {
803 L2CAP_MOVE_STABLE,
804 L2CAP_MOVE_WAIT_REQ,
805 L2CAP_MOVE_WAIT_RSP,
806 L2CAP_MOVE_WAIT_RSP_SUCCESS,
807 L2CAP_MOVE_WAIT_CONFIRM,
808 L2CAP_MOVE_WAIT_CONFIRM_RSP,
809 L2CAP_MOVE_WAIT_LOGICAL_COMP,
810 L2CAP_MOVE_WAIT_LOGICAL_CFM,
811 L2CAP_MOVE_WAIT_LOCAL_BUSY,
812 L2CAP_MOVE_WAIT_PREPARE,
813 };
814
815 void l2cap_chan_hold(struct l2cap_chan *c);
816 struct l2cap_chan *l2cap_chan_hold_unless_zero(struct l2cap_chan *c);
817 void l2cap_chan_put(struct l2cap_chan *c);
818
l2cap_chan_lock(struct l2cap_chan * chan)819 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
820 {
821 mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting));
822 }
823
l2cap_chan_unlock(struct l2cap_chan * chan)824 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
825 {
826 mutex_unlock(&chan->lock);
827 }
828
l2cap_set_timer(struct l2cap_chan * chan,struct delayed_work * work,long timeout)829 static inline void l2cap_set_timer(struct l2cap_chan *chan,
830 struct delayed_work *work, long timeout)
831 {
832 BT_DBG("chan %p state %s timeout %ld", chan,
833 state_to_string(chan->state), timeout);
834
835 /* If delayed work cancelled do not hold(chan)
836 since it is already done with previous set_timer */
837 if (!cancel_delayed_work(work))
838 l2cap_chan_hold(chan);
839
840 schedule_delayed_work(work, timeout);
841 }
842
l2cap_clear_timer(struct l2cap_chan * chan,struct delayed_work * work)843 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
844 struct delayed_work *work)
845 {
846 bool ret;
847
848 /* put(chan) if delayed work cancelled otherwise it
849 is done in delayed work function */
850 ret = cancel_delayed_work(work);
851 if (ret)
852 l2cap_chan_put(chan);
853
854 return ret;
855 }
856
857 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
858 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
859 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
860 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
861 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
862 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
863 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
864
__seq_offset(struct l2cap_chan * chan,__u16 seq1,__u16 seq2)865 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
866 {
867 if (seq1 >= seq2)
868 return seq1 - seq2;
869 else
870 return chan->tx_win_max + 1 - seq2 + seq1;
871 }
872
__next_seq(struct l2cap_chan * chan,__u16 seq)873 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
874 {
875 return (seq + 1) % (chan->tx_win_max + 1);
876 }
877
l2cap_chan_no_new_connection(struct l2cap_chan * chan)878 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
879 {
880 return NULL;
881 }
882
l2cap_chan_no_recv(struct l2cap_chan * chan,struct sk_buff * skb)883 static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
884 {
885 return -ENOSYS;
886 }
887
l2cap_chan_no_alloc_skb(struct l2cap_chan * chan,unsigned long hdr_len,unsigned long len,int nb)888 static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
889 unsigned long hdr_len,
890 unsigned long len, int nb)
891 {
892 return ERR_PTR(-ENOSYS);
893 }
894
l2cap_chan_no_teardown(struct l2cap_chan * chan,int err)895 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
896 {
897 }
898
l2cap_chan_no_close(struct l2cap_chan * chan)899 static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
900 {
901 }
902
l2cap_chan_no_ready(struct l2cap_chan * chan)903 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
904 {
905 }
906
l2cap_chan_no_state_change(struct l2cap_chan * chan,int state,int err)907 static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
908 int state, int err)
909 {
910 }
911
l2cap_chan_no_defer(struct l2cap_chan * chan)912 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
913 {
914 }
915
l2cap_chan_no_suspend(struct l2cap_chan * chan)916 static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
917 {
918 }
919
l2cap_chan_no_resume(struct l2cap_chan * chan)920 static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
921 {
922 }
923
l2cap_chan_no_set_shutdown(struct l2cap_chan * chan)924 static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
925 {
926 }
927
l2cap_chan_no_get_sndtimeo(struct l2cap_chan * chan)928 static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
929 {
930 return 0;
931 }
932
933 extern bool disable_ertm;
934 extern bool enable_ecred;
935
936 int l2cap_init_sockets(void);
937 void l2cap_cleanup_sockets(void);
938 bool l2cap_is_socket(struct socket *sock);
939
940 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
941 void __l2cap_ecred_conn_rsp_defer(struct l2cap_chan *chan);
942 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
943
944 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
945 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid);
946
947 struct l2cap_chan *l2cap_chan_create(void);
948 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
949 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
950 bdaddr_t *dst, u8 dst_type);
951 int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu);
952 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
953 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
954 void l2cap_chan_rx_avail(struct l2cap_chan *chan, ssize_t rx_avail);
955 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
956 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
957 int l2cap_ertm_init(struct l2cap_chan *chan);
958 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
959 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
960 typedef void (*l2cap_chan_func_t)(struct l2cap_chan *chan, void *data);
961 void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func,
962 void *data);
963 void l2cap_chan_del(struct l2cap_chan *chan, int err);
964 void l2cap_send_conn_req(struct l2cap_chan *chan);
965 void l2cap_move_start(struct l2cap_chan *chan);
966 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
967 u8 status);
968 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
969
970 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
971 void l2cap_conn_put(struct l2cap_conn *conn);
972
973 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
974 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
975
976 #endif /* __L2CAP_H */
977