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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
32/* L2CAP defaults */
33#define L2CAP_DEFAULT_MTU 672
34#define L2CAP_DEFAULT_MIN_MTU 48
35#define L2CAP_DEFAULT_FLUSH_TO 0xFFFF
36#define L2CAP_EFS_DEFAULT_FLUSH_TO 0xFFFFFFFF
37#define L2CAP_DEFAULT_TX_WINDOW 63
38#define L2CAP_DEFAULT_EXT_WINDOW 0x3FFF
39#define L2CAP_DEFAULT_MAX_TX 3
40#define L2CAP_DEFAULT_RETRANS_TO 2000 /* 2 seconds */
41#define L2CAP_DEFAULT_MONITOR_TO 12000 /* 12 seconds */
42#define L2CAP_DEFAULT_MAX_PDU_SIZE 1492 /* Sized for AMP packet */
43#define L2CAP_DEFAULT_ACK_TO 200
44#define L2CAP_DEFAULT_MAX_SDU_SIZE 0xFFFF
45#define L2CAP_DEFAULT_SDU_ITIME 0xFFFFFFFF
46#define L2CAP_DEFAULT_ACC_LAT 0xFFFFFFFF
47#define L2CAP_BREDR_MAX_PAYLOAD 1019 /* 3-DH5 packet */
48#define L2CAP_LE_MIN_MTU 23
49
50#define L2CAP_DISC_TIMEOUT msecs_to_jiffies(100)
51#define L2CAP_DISC_REJ_TIMEOUT msecs_to_jiffies(5000)
52#define L2CAP_ENC_TIMEOUT msecs_to_jiffies(5000)
53#define L2CAP_CONN_TIMEOUT msecs_to_jiffies(40000)
54#define L2CAP_INFO_TIMEOUT msecs_to_jiffies(4000)
55#define L2CAP_MOVE_TIMEOUT msecs_to_jiffies(4000)
56#define L2CAP_MOVE_ERTX_TIMEOUT msecs_to_jiffies(60000)
57
58#define L2CAP_A2MP_DEFAULT_MTU 670
59
60/* L2CAP socket address */
61struct sockaddr_l2 {
62 sa_family_t l2_family;
63 __le16 l2_psm;
64 bdaddr_t l2_bdaddr;
65 __le16 l2_cid;
66 __u8 l2_bdaddr_type;
67};
68
69/* L2CAP socket options */
70#define L2CAP_OPTIONS 0x01
71struct l2cap_options {
72 __u16 omtu;
73 __u16 imtu;
74 __u16 flush_to;
75 __u8 mode;
76 __u8 fcs;
77 __u8 max_tx;
78 __u16 txwin_size;
79};
80
81#define L2CAP_CONNINFO 0x02
82struct l2cap_conninfo {
83 __u16 hci_handle;
84 __u8 dev_class[3];
85};
86
87#define L2CAP_LM 0x03
88#define L2CAP_LM_MASTER 0x0001
89#define L2CAP_LM_AUTH 0x0002
90#define L2CAP_LM_ENCRYPT 0x0004
91#define L2CAP_LM_TRUSTED 0x0008
92#define L2CAP_LM_RELIABLE 0x0010
93#define L2CAP_LM_SECURE 0x0020
94#define L2CAP_LM_FIPS 0x0040
95
96/* L2CAP command codes */
97#define L2CAP_COMMAND_REJ 0x01
98#define L2CAP_CONN_REQ 0x02
99#define L2CAP_CONN_RSP 0x03
100#define L2CAP_CONF_REQ 0x04
101#define L2CAP_CONF_RSP 0x05
102#define L2CAP_DISCONN_REQ 0x06
103#define L2CAP_DISCONN_RSP 0x07
104#define L2CAP_ECHO_REQ 0x08
105#define L2CAP_ECHO_RSP 0x09
106#define L2CAP_INFO_REQ 0x0a
107#define L2CAP_INFO_RSP 0x0b
108#define L2CAP_CREATE_CHAN_REQ 0x0c
109#define L2CAP_CREATE_CHAN_RSP 0x0d
110#define L2CAP_MOVE_CHAN_REQ 0x0e
111#define L2CAP_MOVE_CHAN_RSP 0x0f
112#define L2CAP_MOVE_CHAN_CFM 0x10
113#define L2CAP_MOVE_CHAN_CFM_RSP 0x11
114#define L2CAP_CONN_PARAM_UPDATE_REQ 0x12
115#define L2CAP_CONN_PARAM_UPDATE_RSP 0x13
116#define L2CAP_LE_CONN_REQ 0x14
117#define L2CAP_LE_CONN_RSP 0x15
118#define L2CAP_LE_CREDITS 0x16
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_L2CAP 0x02
138#define L2CAP_FC_CONNLESS 0x04
139#define L2CAP_FC_A2MP 0x08
140#define L2CAP_FC_6LOWPAN 0x3e /* reserved and temporary value */
141
142/* L2CAP Control Field bit masks */
143#define L2CAP_CTRL_SAR 0xC000
144#define L2CAP_CTRL_REQSEQ 0x3F00
145#define L2CAP_CTRL_TXSEQ 0x007E
146#define L2CAP_CTRL_SUPERVISE 0x000C
147
148#define L2CAP_CTRL_RETRANS 0x0080
149#define L2CAP_CTRL_FINAL 0x0080
150#define L2CAP_CTRL_POLL 0x0010
151#define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */
152
153#define L2CAP_CTRL_TXSEQ_SHIFT 1
154#define L2CAP_CTRL_SUPER_SHIFT 2
155#define L2CAP_CTRL_POLL_SHIFT 4
156#define L2CAP_CTRL_FINAL_SHIFT 7
157#define L2CAP_CTRL_REQSEQ_SHIFT 8
158#define L2CAP_CTRL_SAR_SHIFT 14
159
160/* L2CAP Extended Control Field bit mask */
161#define L2CAP_EXT_CTRL_TXSEQ 0xFFFC0000
162#define L2CAP_EXT_CTRL_SAR 0x00030000
163#define L2CAP_EXT_CTRL_SUPERVISE 0x00030000
164#define L2CAP_EXT_CTRL_REQSEQ 0x0000FFFC
165
166#define L2CAP_EXT_CTRL_POLL 0x00040000
167#define L2CAP_EXT_CTRL_FINAL 0x00000002
168#define L2CAP_EXT_CTRL_FRAME_TYPE 0x00000001 /* I- or S-Frame */
169
170#define L2CAP_EXT_CTRL_FINAL_SHIFT 1
171#define L2CAP_EXT_CTRL_REQSEQ_SHIFT 2
172#define L2CAP_EXT_CTRL_SAR_SHIFT 16
173#define L2CAP_EXT_CTRL_SUPER_SHIFT 16
174#define L2CAP_EXT_CTRL_POLL_SHIFT 18
175#define L2CAP_EXT_CTRL_TXSEQ_SHIFT 18
176
177/* L2CAP Supervisory Function */
178#define L2CAP_SUPER_RR 0x00
179#define L2CAP_SUPER_REJ 0x01
180#define L2CAP_SUPER_RNR 0x02
181#define L2CAP_SUPER_SREJ 0x03
182
183/* L2CAP Segmentation and Reassembly */
184#define L2CAP_SAR_UNSEGMENTED 0x00
185#define L2CAP_SAR_START 0x01
186#define L2CAP_SAR_END 0x02
187#define L2CAP_SAR_CONTINUE 0x03
188
189/* L2CAP Command rej. reasons */
190#define L2CAP_REJ_NOT_UNDERSTOOD 0x0000
191#define L2CAP_REJ_MTU_EXCEEDED 0x0001
192#define L2CAP_REJ_INVALID_CID 0x0002
193
194/* L2CAP structures */
195struct l2cap_hdr {
196 __le16 len;
197 __le16 cid;
198} __packed;
199#define L2CAP_HDR_SIZE 4
200#define L2CAP_ENH_HDR_SIZE 6
201#define L2CAP_EXT_HDR_SIZE 8
202
203#define L2CAP_FCS_SIZE 2
204#define L2CAP_SDULEN_SIZE 2
205#define L2CAP_PSMLEN_SIZE 2
206#define L2CAP_ENH_CTRL_SIZE 2
207#define L2CAP_EXT_CTRL_SIZE 4
208
209struct l2cap_cmd_hdr {
210 __u8 code;
211 __u8 ident;
212 __le16 len;
213} __packed;
214#define L2CAP_CMD_HDR_SIZE 4
215
216struct l2cap_cmd_rej_unk {
217 __le16 reason;
218} __packed;
219
220struct l2cap_cmd_rej_mtu {
221 __le16 reason;
222 __le16 max_mtu;
223} __packed;
224
225struct l2cap_cmd_rej_cid {
226 __le16 reason;
227 __le16 scid;
228 __le16 dcid;
229} __packed;
230
231struct l2cap_conn_req {
232 __le16 psm;
233 __le16 scid;
234} __packed;
235
236struct l2cap_conn_rsp {
237 __le16 dcid;
238 __le16 scid;
239 __le16 result;
240 __le16 status;
241} __packed;
242
243/* protocol/service multiplexer (PSM) */
244#define L2CAP_PSM_SDP 0x0001
245#define L2CAP_PSM_RFCOMM 0x0003
246#define L2CAP_PSM_3DSP 0x0021
247
248/* channel identifier */
249#define L2CAP_CID_SIGNALING 0x0001
250#define L2CAP_CID_CONN_LESS 0x0002
251#define L2CAP_CID_A2MP 0x0003
252#define L2CAP_CID_ATT 0x0004
253#define L2CAP_CID_LE_SIGNALING 0x0005
254#define L2CAP_CID_SMP 0x0006
255#define L2CAP_CID_DYN_START 0x0040
256#define L2CAP_CID_DYN_END 0xffff
257#define L2CAP_CID_LE_DYN_END 0x007f
258
259/* connect/create channel results */
260#define L2CAP_CR_SUCCESS 0x0000
261#define L2CAP_CR_PEND 0x0001
262#define L2CAP_CR_BAD_PSM 0x0002
263#define L2CAP_CR_SEC_BLOCK 0x0003
264#define L2CAP_CR_NO_MEM 0x0004
265#define L2CAP_CR_BAD_AMP 0x0005
266#define L2CAP_CR_AUTHENTICATION 0x0005
267#define L2CAP_CR_AUTHORIZATION 0x0006
268#define L2CAP_CR_BAD_KEY_SIZE 0x0007
269#define L2CAP_CR_ENCRYPTION 0x0008
270
271/* connect/create channel status */
272#define L2CAP_CS_NO_INFO 0x0000
273#define L2CAP_CS_AUTHEN_PEND 0x0001
274#define L2CAP_CS_AUTHOR_PEND 0x0002
275
276struct l2cap_conf_req {
277 __le16 dcid;
278 __le16 flags;
279 __u8 data[0];
280} __packed;
281
282struct l2cap_conf_rsp {
283 __le16 scid;
284 __le16 flags;
285 __le16 result;
286 __u8 data[0];
287} __packed;
288
289#define L2CAP_CONF_SUCCESS 0x0000
290#define L2CAP_CONF_UNACCEPT 0x0001
291#define L2CAP_CONF_REJECT 0x0002
292#define L2CAP_CONF_UNKNOWN 0x0003
293#define L2CAP_CONF_PENDING 0x0004
294#define L2CAP_CONF_EFS_REJECT 0x0005
295
296/* configuration req/rsp continuation flag */
297#define L2CAP_CONF_FLAG_CONTINUATION 0x0001
298
299struct l2cap_conf_opt {
300 __u8 type;
301 __u8 len;
302 __u8 val[0];
303} __packed;
304#define L2CAP_CONF_OPT_SIZE 2
305
306#define L2CAP_CONF_HINT 0x80
307#define L2CAP_CONF_MASK 0x7f
308
309#define L2CAP_CONF_MTU 0x01
310#define L2CAP_CONF_FLUSH_TO 0x02
311#define L2CAP_CONF_QOS 0x03
312#define L2CAP_CONF_RFC 0x04
313#define L2CAP_CONF_FCS 0x05
314#define L2CAP_CONF_EFS 0x06
315#define L2CAP_CONF_EWS 0x07
316
317#define L2CAP_CONF_MAX_SIZE 22
318
319struct l2cap_conf_rfc {
320 __u8 mode;
321 __u8 txwin_size;
322 __u8 max_transmit;
323 __le16 retrans_timeout;
324 __le16 monitor_timeout;
325 __le16 max_pdu_size;
326} __packed;
327
328#define L2CAP_MODE_BASIC 0x00
329#define L2CAP_MODE_RETRANS 0x01
330#define L2CAP_MODE_FLOWCTL 0x02
331#define L2CAP_MODE_ERTM 0x03
332#define L2CAP_MODE_STREAMING 0x04
333
334/* Unlike the above this one doesn't actually map to anything that would
335 * ever be sent over the air. Therefore, use a value that's unlikely to
336 * ever be used in the BR/EDR configuration phase.
337 */
338#define L2CAP_MODE_LE_FLOWCTL 0x80
339
340struct l2cap_conf_efs {
341 __u8 id;
342 __u8 stype;
343 __le16 msdu;
344 __le32 sdu_itime;
345 __le32 acc_lat;
346 __le32 flush_to;
347} __packed;
348
349#define L2CAP_SERV_NOTRAFIC 0x00
350#define L2CAP_SERV_BESTEFFORT 0x01
351#define L2CAP_SERV_GUARANTEED 0x02
352
353#define L2CAP_BESTEFFORT_ID 0x01
354
355struct l2cap_disconn_req {
356 __le16 dcid;
357 __le16 scid;
358} __packed;
359
360struct l2cap_disconn_rsp {
361 __le16 dcid;
362 __le16 scid;
363} __packed;
364
365struct l2cap_info_req {
366 __le16 type;
367} __packed;
368
369struct l2cap_info_rsp {
370 __le16 type;
371 __le16 result;
372 __u8 data[0];
373} __packed;
374
375struct l2cap_create_chan_req {
376 __le16 psm;
377 __le16 scid;
378 __u8 amp_id;
379} __packed;
380
381struct l2cap_create_chan_rsp {
382 __le16 dcid;
383 __le16 scid;
384 __le16 result;
385 __le16 status;
386} __packed;
387
388struct l2cap_move_chan_req {
389 __le16 icid;
390 __u8 dest_amp_id;
391} __packed;
392
393struct l2cap_move_chan_rsp {
394 __le16 icid;
395 __le16 result;
396} __packed;
397
398#define L2CAP_MR_SUCCESS 0x0000
399#define L2CAP_MR_PEND 0x0001
400#define L2CAP_MR_BAD_ID 0x0002
401#define L2CAP_MR_SAME_ID 0x0003
402#define L2CAP_MR_NOT_SUPP 0x0004
403#define L2CAP_MR_COLLISION 0x0005
404#define L2CAP_MR_NOT_ALLOWED 0x0006
405
406struct l2cap_move_chan_cfm {
407 __le16 icid;
408 __le16 result;
409} __packed;
410
411#define L2CAP_MC_CONFIRMED 0x0000
412#define L2CAP_MC_UNCONFIRMED 0x0001
413
414struct l2cap_move_chan_cfm_rsp {
415 __le16 icid;
416} __packed;
417
418/* info type */
419#define L2CAP_IT_CL_MTU 0x0001
420#define L2CAP_IT_FEAT_MASK 0x0002
421#define L2CAP_IT_FIXED_CHAN 0x0003
422
423/* info result */
424#define L2CAP_IR_SUCCESS 0x0000
425#define L2CAP_IR_NOTSUPP 0x0001
426
427struct l2cap_conn_param_update_req {
428 __le16 min;
429 __le16 max;
430 __le16 latency;
431 __le16 to_multiplier;
432} __packed;
433
434struct l2cap_conn_param_update_rsp {
435 __le16 result;
436} __packed;
437
438/* Connection Parameters result */
439#define L2CAP_CONN_PARAM_ACCEPTED 0x0000
440#define L2CAP_CONN_PARAM_REJECTED 0x0001
441
442#define L2CAP_LE_MAX_CREDITS 10
443#define L2CAP_LE_DEFAULT_MPS 230
444
445struct l2cap_le_conn_req {
446 __le16 psm;
447 __le16 scid;
448 __le16 mtu;
449 __le16 mps;
450 __le16 credits;
451} __packed;
452
453struct l2cap_le_conn_rsp {
454 __le16 dcid;
455 __le16 mtu;
456 __le16 mps;
457 __le16 credits;
458 __le16 result;
459} __packed;
460
461struct l2cap_le_credits {
462 __le16 cid;
463 __le16 credits;
464} __packed;
465
466/* ----- L2CAP channels and connections ----- */
467struct l2cap_seq_list {
468 __u16 head;
469 __u16 tail;
470 __u16 mask;
471 __u16 *list;
472};
473
474#define L2CAP_SEQ_LIST_CLEAR 0xFFFF
475#define L2CAP_SEQ_LIST_TAIL 0x8000
476
477struct l2cap_chan {
478 struct l2cap_conn *conn;
479 struct hci_conn *hs_hcon;
480 struct hci_chan *hs_hchan;
481 struct kref kref;
482
483 __u8 state;
484
485 bdaddr_t dst;
486 __u8 dst_type;
487 bdaddr_t src;
488 __u8 src_type;
489 __le16 psm;
490 __le16 sport;
491 __u16 dcid;
492 __u16 scid;
493
494 __u16 imtu;
495 __u16 omtu;
496 __u16 flush_to;
497 __u8 mode;
498 __u8 chan_type;
499 __u8 chan_policy;
500
501 __u8 sec_level;
502
503 __u8 ident;
504
505 __u8 conf_req[64];
506 __u8 conf_len;
507 __u8 num_conf_req;
508 __u8 num_conf_rsp;
509
510 __u8 fcs;
511
512 __u16 tx_win;
513 __u16 tx_win_max;
514 __u16 ack_win;
515 __u8 max_tx;
516 __u16 retrans_timeout;
517 __u16 monitor_timeout;
518 __u16 mps;
519
520 __u16 tx_credits;
521 __u16 rx_credits;
522
523 __u8 tx_state;
524 __u8 rx_state;
525
526 unsigned long conf_state;
527 unsigned long conn_state;
528 unsigned long flags;
529
530 __u8 remote_amp_id;
531 __u8 local_amp_id;
532 __u8 move_id;
533 __u8 move_state;
534 __u8 move_role;
535
536 __u16 next_tx_seq;
537 __u16 expected_ack_seq;
538 __u16 expected_tx_seq;
539 __u16 buffer_seq;
540 __u16 srej_save_reqseq;
541 __u16 last_acked_seq;
542 __u16 frames_sent;
543 __u16 unacked_frames;
544 __u8 retry_count;
545 __u16 sdu_len;
546 struct sk_buff *sdu;
547 struct sk_buff *sdu_last_frag;
548
549 __u16 remote_tx_win;
550 __u8 remote_max_tx;
551 __u16 remote_mps;
552
553 __u8 local_id;
554 __u8 local_stype;
555 __u16 local_msdu;
556 __u32 local_sdu_itime;
557 __u32 local_acc_lat;
558 __u32 local_flush_to;
559
560 __u8 remote_id;
561 __u8 remote_stype;
562 __u16 remote_msdu;
563 __u32 remote_sdu_itime;
564 __u32 remote_acc_lat;
565 __u32 remote_flush_to;
566
567 struct delayed_work chan_timer;
568 struct delayed_work retrans_timer;
569 struct delayed_work monitor_timer;
570 struct delayed_work ack_timer;
571
572 struct sk_buff *tx_send_head;
573 struct sk_buff_head tx_q;
574 struct sk_buff_head srej_q;
575 struct l2cap_seq_list srej_list;
576 struct l2cap_seq_list retrans_list;
577
578 struct list_head list;
579 struct list_head global_l;
580
581 void *data;
582 struct l2cap_ops *ops;
583 struct mutex lock;
584};
585
586struct l2cap_ops {
587 char *name;
588
589 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan);
590 int (*recv) (struct l2cap_chan * chan,
591 struct sk_buff *skb);
592 void (*teardown) (struct l2cap_chan *chan, int err);
593 void (*close) (struct l2cap_chan *chan);
594 void (*state_change) (struct l2cap_chan *chan,
595 int state, int err);
596 void (*ready) (struct l2cap_chan *chan);
597 void (*defer) (struct l2cap_chan *chan);
598 void (*resume) (struct l2cap_chan *chan);
599 void (*suspend) (struct l2cap_chan *chan);
600 void (*set_shutdown) (struct l2cap_chan *chan);
601 long (*get_sndtimeo) (struct l2cap_chan *chan);
602 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan,
603 unsigned long len, int nb);
604};
605
606struct l2cap_conn {
607 struct hci_conn *hcon;
608 struct hci_chan *hchan;
609
610 unsigned int mtu;
611
612 __u32 feat_mask;
613 __u8 fixed_chan_mask;
614 bool hs_enabled;
615
616 __u8 info_state;
617 __u8 info_ident;
618
619 struct delayed_work info_timer;
620
621 spinlock_t lock;
622
623 struct sk_buff *rx_skb;
624 __u32 rx_len;
625 __u8 tx_ident;
626
627 struct sk_buff_head pending_rx;
628 struct work_struct pending_rx_work;
629
630 __u8 disc_reason;
631
632 struct delayed_work security_timer;
633 struct smp_chan *smp_chan;
634
635 struct list_head chan_l;
636 struct mutex chan_lock;
637 struct kref ref;
638 struct list_head users;
639};
640
641struct l2cap_user {
642 struct list_head list;
643 int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
644 void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
645};
646
647#define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
648#define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
649#define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
650
651#define L2CAP_CHAN_RAW 1
652#define L2CAP_CHAN_CONN_LESS 2
653#define L2CAP_CHAN_CONN_ORIENTED 3
654#define L2CAP_CHAN_FIXED 4
655
656/* ----- L2CAP socket info ----- */
657#define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
658
659struct l2cap_pinfo {
660 struct bt_sock bt;
661 struct l2cap_chan *chan;
662 struct sk_buff *rx_busy_skb;
663};
664
665enum {
666 CONF_REQ_SENT,
667 CONF_INPUT_DONE,
668 CONF_OUTPUT_DONE,
669 CONF_MTU_DONE,
670 CONF_MODE_DONE,
671 CONF_CONNECT_PEND,
672 CONF_RECV_NO_FCS,
673 CONF_STATE2_DEVICE,
674 CONF_EWS_RECV,
675 CONF_LOC_CONF_PEND,
676 CONF_REM_CONF_PEND,
677 CONF_NOT_COMPLETE,
678};
679
680#define L2CAP_CONF_MAX_CONF_REQ 2
681#define L2CAP_CONF_MAX_CONF_RSP 2
682
683enum {
684 CONN_SREJ_SENT,
685 CONN_WAIT_F,
686 CONN_SREJ_ACT,
687 CONN_SEND_PBIT,
688 CONN_REMOTE_BUSY,
689 CONN_LOCAL_BUSY,
690 CONN_REJ_ACT,
691 CONN_SEND_FBIT,
692 CONN_RNR_SENT,
693};
694
695/* Definitions for flags in l2cap_chan */
696enum {
697 FLAG_ROLE_SWITCH,
698 FLAG_FORCE_ACTIVE,
699 FLAG_FORCE_RELIABLE,
700 FLAG_FLUSHABLE,
701 FLAG_EXT_CTRL,
702 FLAG_EFS_ENABLE,
703 FLAG_DEFER_SETUP,
704 FLAG_LE_CONN_REQ_SENT,
705};
706
707enum {
708 L2CAP_TX_STATE_XMIT,
709 L2CAP_TX_STATE_WAIT_F,
710};
711
712enum {
713 L2CAP_RX_STATE_RECV,
714 L2CAP_RX_STATE_SREJ_SENT,
715 L2CAP_RX_STATE_MOVE,
716 L2CAP_RX_STATE_WAIT_P,
717 L2CAP_RX_STATE_WAIT_F,
718};
719
720enum {
721 L2CAP_TXSEQ_EXPECTED,
722 L2CAP_TXSEQ_EXPECTED_SREJ,
723 L2CAP_TXSEQ_UNEXPECTED,
724 L2CAP_TXSEQ_UNEXPECTED_SREJ,
725 L2CAP_TXSEQ_DUPLICATE,
726 L2CAP_TXSEQ_DUPLICATE_SREJ,
727 L2CAP_TXSEQ_INVALID,
728 L2CAP_TXSEQ_INVALID_IGNORE,
729};
730
731enum {
732 L2CAP_EV_DATA_REQUEST,
733 L2CAP_EV_LOCAL_BUSY_DETECTED,
734 L2CAP_EV_LOCAL_BUSY_CLEAR,
735 L2CAP_EV_RECV_REQSEQ_AND_FBIT,
736 L2CAP_EV_RECV_FBIT,
737 L2CAP_EV_RETRANS_TO,
738 L2CAP_EV_MONITOR_TO,
739 L2CAP_EV_EXPLICIT_POLL,
740 L2CAP_EV_RECV_IFRAME,
741 L2CAP_EV_RECV_RR,
742 L2CAP_EV_RECV_REJ,
743 L2CAP_EV_RECV_RNR,
744 L2CAP_EV_RECV_SREJ,
745 L2CAP_EV_RECV_FRAME,
746};
747
748enum {
749 L2CAP_MOVE_ROLE_NONE,
750 L2CAP_MOVE_ROLE_INITIATOR,
751 L2CAP_MOVE_ROLE_RESPONDER,
752};
753
754enum {
755 L2CAP_MOVE_STABLE,
756 L2CAP_MOVE_WAIT_REQ,
757 L2CAP_MOVE_WAIT_RSP,
758 L2CAP_MOVE_WAIT_RSP_SUCCESS,
759 L2CAP_MOVE_WAIT_CONFIRM,
760 L2CAP_MOVE_WAIT_CONFIRM_RSP,
761 L2CAP_MOVE_WAIT_LOGICAL_COMP,
762 L2CAP_MOVE_WAIT_LOGICAL_CFM,
763 L2CAP_MOVE_WAIT_LOCAL_BUSY,
764 L2CAP_MOVE_WAIT_PREPARE,
765};
766
767void l2cap_chan_hold(struct l2cap_chan *c);
768void l2cap_chan_put(struct l2cap_chan *c);
769
770static inline void l2cap_chan_lock(struct l2cap_chan *chan)
771{
772 mutex_lock(&chan->lock);
773}
774
775static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
776{
777 mutex_unlock(&chan->lock);
778}
779
780static inline void l2cap_set_timer(struct l2cap_chan *chan,
781 struct delayed_work *work, long timeout)
782{
783 BT_DBG("chan %p state %s timeout %ld", chan,
784 state_to_string(chan->state), timeout);
785
786 /* If delayed work cancelled do not hold(chan)
787 since it is already done with previous set_timer */
788 if (!cancel_delayed_work(work))
789 l2cap_chan_hold(chan);
790
791 schedule_delayed_work(work, timeout);
792}
793
794static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
795 struct delayed_work *work)
796{
797 bool ret;
798
799 /* put(chan) if delayed work cancelled otherwise it
800 is done in delayed work function */
801 ret = cancel_delayed_work(work);
802 if (ret)
803 l2cap_chan_put(chan);
804
805 return ret;
806}
807
808#define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
809#define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
810#define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
811#define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
812#define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
813 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
814#define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
815
816static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
817{
818 if (seq1 >= seq2)
819 return seq1 - seq2;
820 else
821 return chan->tx_win_max + 1 - seq2 + seq1;
822}
823
824static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
825{
826 return (seq + 1) % (chan->tx_win_max + 1);
827}
828
829static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
830{
831 return NULL;
832}
833
834static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
835{
836}
837
838static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
839{
840}
841
842static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
843{
844}
845
846static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
847{
848}
849
850static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
851{
852}
853
854static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
855{
856 return 0;
857}
858
859extern bool disable_ertm;
860
861int l2cap_init_sockets(void);
862void l2cap_cleanup_sockets(void);
863bool l2cap_is_socket(struct socket *sock);
864
865void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
866void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
867
868int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
869int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid);
870
871struct l2cap_chan *l2cap_chan_create(void);
872void l2cap_chan_close(struct l2cap_chan *chan, int reason);
873int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
874 bdaddr_t *dst, u8 dst_type);
875int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
876 u32 priority);
877void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
878int l2cap_chan_check_security(struct l2cap_chan *chan);
879void l2cap_chan_set_defaults(struct l2cap_chan *chan);
880int l2cap_ertm_init(struct l2cap_chan *chan);
881void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
882void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
883void l2cap_chan_del(struct l2cap_chan *chan, int err);
884void l2cap_conn_update_id_addr(struct hci_conn *hcon);
885void l2cap_send_conn_req(struct l2cap_chan *chan);
886void l2cap_move_start(struct l2cap_chan *chan);
887void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
888 u8 status);
889void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
890
891void l2cap_conn_get(struct l2cap_conn *conn);
892void l2cap_conn_put(struct l2cap_conn *conn);
893
894int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
895void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
896
897#endif /* __L2CAP_H */
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#define L2CAP_A2MP_DEFAULT_MTU 670
63
64/* L2CAP socket address */
65struct sockaddr_l2 {
66 sa_family_t l2_family;
67 __le16 l2_psm;
68 bdaddr_t l2_bdaddr;
69 __le16 l2_cid;
70 __u8 l2_bdaddr_type;
71};
72
73/* L2CAP socket options */
74#define L2CAP_OPTIONS 0x01
75struct l2cap_options {
76 __u16 omtu;
77 __u16 imtu;
78 __u16 flush_to;
79 __u8 mode;
80 __u8 fcs;
81 __u8 max_tx;
82 __u16 txwin_size;
83};
84
85#define L2CAP_CONNINFO 0x02
86struct l2cap_conninfo {
87 __u16 hci_handle;
88 __u8 dev_class[3];
89};
90
91#define L2CAP_LM 0x03
92#define L2CAP_LM_MASTER 0x0001
93#define L2CAP_LM_AUTH 0x0002
94#define L2CAP_LM_ENCRYPT 0x0004
95#define L2CAP_LM_TRUSTED 0x0008
96#define L2CAP_LM_RELIABLE 0x0010
97#define L2CAP_LM_SECURE 0x0020
98#define L2CAP_LM_FIPS 0x0040
99
100/* L2CAP command codes */
101#define L2CAP_COMMAND_REJ 0x01
102#define L2CAP_CONN_REQ 0x02
103#define L2CAP_CONN_RSP 0x03
104#define L2CAP_CONF_REQ 0x04
105#define L2CAP_CONF_RSP 0x05
106#define L2CAP_DISCONN_REQ 0x06
107#define L2CAP_DISCONN_RSP 0x07
108#define L2CAP_ECHO_REQ 0x08
109#define L2CAP_ECHO_RSP 0x09
110#define L2CAP_INFO_REQ 0x0a
111#define L2CAP_INFO_RSP 0x0b
112#define L2CAP_CREATE_CHAN_REQ 0x0c
113#define L2CAP_CREATE_CHAN_RSP 0x0d
114#define L2CAP_MOVE_CHAN_REQ 0x0e
115#define L2CAP_MOVE_CHAN_RSP 0x0f
116#define L2CAP_MOVE_CHAN_CFM 0x10
117#define L2CAP_MOVE_CHAN_CFM_RSP 0x11
118#define L2CAP_CONN_PARAM_UPDATE_REQ 0x12
119#define L2CAP_CONN_PARAM_UPDATE_RSP 0x13
120#define L2CAP_LE_CONN_REQ 0x14
121#define L2CAP_LE_CONN_RSP 0x15
122#define L2CAP_LE_CREDITS 0x16
123#define L2CAP_ECRED_CONN_REQ 0x17
124#define L2CAP_ECRED_CONN_RSP 0x18
125#define L2CAP_ECRED_RECONF_REQ 0x19
126#define L2CAP_ECRED_RECONF_RSP 0x1a
127
128/* L2CAP extended feature mask */
129#define L2CAP_FEAT_FLOWCTL 0x00000001
130#define L2CAP_FEAT_RETRANS 0x00000002
131#define L2CAP_FEAT_BIDIR_QOS 0x00000004
132#define L2CAP_FEAT_ERTM 0x00000008
133#define L2CAP_FEAT_STREAMING 0x00000010
134#define L2CAP_FEAT_FCS 0x00000020
135#define L2CAP_FEAT_EXT_FLOW 0x00000040
136#define L2CAP_FEAT_FIXED_CHAN 0x00000080
137#define L2CAP_FEAT_EXT_WINDOW 0x00000100
138#define L2CAP_FEAT_UCD 0x00000200
139
140/* L2CAP checksum option */
141#define L2CAP_FCS_NONE 0x00
142#define L2CAP_FCS_CRC16 0x01
143
144/* L2CAP fixed channels */
145#define L2CAP_FC_SIG_BREDR 0x02
146#define L2CAP_FC_CONNLESS 0x04
147#define L2CAP_FC_A2MP 0x08
148#define L2CAP_FC_ATT 0x10
149#define L2CAP_FC_SIG_LE 0x20
150#define L2CAP_FC_SMP_LE 0x40
151#define L2CAP_FC_SMP_BREDR 0x80
152
153/* L2CAP Control Field bit masks */
154#define L2CAP_CTRL_SAR 0xC000
155#define L2CAP_CTRL_REQSEQ 0x3F00
156#define L2CAP_CTRL_TXSEQ 0x007E
157#define L2CAP_CTRL_SUPERVISE 0x000C
158
159#define L2CAP_CTRL_RETRANS 0x0080
160#define L2CAP_CTRL_FINAL 0x0080
161#define L2CAP_CTRL_POLL 0x0010
162#define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */
163
164#define L2CAP_CTRL_TXSEQ_SHIFT 1
165#define L2CAP_CTRL_SUPER_SHIFT 2
166#define L2CAP_CTRL_POLL_SHIFT 4
167#define L2CAP_CTRL_FINAL_SHIFT 7
168#define L2CAP_CTRL_REQSEQ_SHIFT 8
169#define L2CAP_CTRL_SAR_SHIFT 14
170
171/* L2CAP Extended Control Field bit mask */
172#define L2CAP_EXT_CTRL_TXSEQ 0xFFFC0000
173#define L2CAP_EXT_CTRL_SAR 0x00030000
174#define L2CAP_EXT_CTRL_SUPERVISE 0x00030000
175#define L2CAP_EXT_CTRL_REQSEQ 0x0000FFFC
176
177#define L2CAP_EXT_CTRL_POLL 0x00040000
178#define L2CAP_EXT_CTRL_FINAL 0x00000002
179#define L2CAP_EXT_CTRL_FRAME_TYPE 0x00000001 /* I- or S-Frame */
180
181#define L2CAP_EXT_CTRL_FINAL_SHIFT 1
182#define L2CAP_EXT_CTRL_REQSEQ_SHIFT 2
183#define L2CAP_EXT_CTRL_SAR_SHIFT 16
184#define L2CAP_EXT_CTRL_SUPER_SHIFT 16
185#define L2CAP_EXT_CTRL_POLL_SHIFT 18
186#define L2CAP_EXT_CTRL_TXSEQ_SHIFT 18
187
188/* L2CAP Supervisory Function */
189#define L2CAP_SUPER_RR 0x00
190#define L2CAP_SUPER_REJ 0x01
191#define L2CAP_SUPER_RNR 0x02
192#define L2CAP_SUPER_SREJ 0x03
193
194/* L2CAP Segmentation and Reassembly */
195#define L2CAP_SAR_UNSEGMENTED 0x00
196#define L2CAP_SAR_START 0x01
197#define L2CAP_SAR_END 0x02
198#define L2CAP_SAR_CONTINUE 0x03
199
200/* L2CAP Command rej. reasons */
201#define L2CAP_REJ_NOT_UNDERSTOOD 0x0000
202#define L2CAP_REJ_MTU_EXCEEDED 0x0001
203#define L2CAP_REJ_INVALID_CID 0x0002
204
205/* L2CAP structures */
206struct l2cap_hdr {
207 __le16 len;
208 __le16 cid;
209} __packed;
210#define L2CAP_LEN_SIZE 2
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
221struct l2cap_cmd_hdr {
222 __u8 code;
223 __u8 ident;
224 __le16 len;
225} __packed;
226#define L2CAP_CMD_HDR_SIZE 4
227
228struct l2cap_cmd_rej_unk {
229 __le16 reason;
230} __packed;
231
232struct l2cap_cmd_rej_mtu {
233 __le16 reason;
234 __le16 max_mtu;
235} __packed;
236
237struct l2cap_cmd_rej_cid {
238 __le16 reason;
239 __le16 scid;
240 __le16 dcid;
241} __packed;
242
243struct l2cap_conn_req {
244 __le16 psm;
245 __le16 scid;
246} __packed;
247
248struct 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
307struct l2cap_conf_req {
308 __le16 dcid;
309 __le16 flags;
310 __u8 data[];
311} __packed;
312
313struct 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
330struct 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
350struct 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
372struct 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
387struct l2cap_disconn_req {
388 __le16 dcid;
389 __le16 scid;
390} __packed;
391
392struct l2cap_disconn_rsp {
393 __le16 dcid;
394 __le16 scid;
395} __packed;
396
397struct l2cap_info_req {
398 __le16 type;
399} __packed;
400
401struct l2cap_info_rsp {
402 __le16 type;
403 __le16 result;
404 __u8 data[];
405} __packed;
406
407struct l2cap_create_chan_req {
408 __le16 psm;
409 __le16 scid;
410 __u8 amp_id;
411} __packed;
412
413struct l2cap_create_chan_rsp {
414 __le16 dcid;
415 __le16 scid;
416 __le16 result;
417 __le16 status;
418} __packed;
419
420struct l2cap_move_chan_req {
421 __le16 icid;
422 __u8 dest_amp_id;
423} __packed;
424
425struct 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
438struct 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
446struct 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
459struct l2cap_conn_param_update_req {
460 __le16 min;
461 __le16 max;
462 __le16 latency;
463 __le16 to_multiplier;
464} __packed;
465
466struct 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
474struct l2cap_le_conn_req {
475 __le16 psm;
476 __le16 scid;
477 __le16 mtu;
478 __le16 mps;
479 __le16 credits;
480} __packed;
481
482struct l2cap_le_conn_rsp {
483 __le16 dcid;
484 __le16 mtu;
485 __le16 mps;
486 __le16 credits;
487 __le16 result;
488} __packed;
489
490struct 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#define L2CAP_ECRED_MAX_CID 5
498
499struct l2cap_ecred_conn_req {
500 __le16 psm;
501 __le16 mtu;
502 __le16 mps;
503 __le16 credits;
504 __le16 scid[];
505} __packed;
506
507struct l2cap_ecred_conn_rsp {
508 __le16 mtu;
509 __le16 mps;
510 __le16 credits;
511 __le16 result;
512 __le16 dcid[];
513};
514
515struct l2cap_ecred_reconf_req {
516 __le16 mtu;
517 __le16 mps;
518 __le16 scid[];
519} __packed;
520
521#define L2CAP_RECONF_SUCCESS 0x0000
522#define L2CAP_RECONF_INVALID_MTU 0x0001
523#define L2CAP_RECONF_INVALID_MPS 0x0002
524
525struct l2cap_ecred_reconf_rsp {
526 __le16 result;
527} __packed;
528
529/* ----- L2CAP channels and connections ----- */
530struct l2cap_seq_list {
531 __u16 head;
532 __u16 tail;
533 __u16 mask;
534 __u16 *list;
535};
536
537#define L2CAP_SEQ_LIST_CLEAR 0xFFFF
538#define L2CAP_SEQ_LIST_TAIL 0x8000
539
540struct l2cap_chan {
541 struct l2cap_conn *conn;
542 struct hci_conn *hs_hcon;
543 struct hci_chan *hs_hchan;
544 struct kref kref;
545 atomic_t nesting;
546
547 __u8 state;
548
549 bdaddr_t dst;
550 __u8 dst_type;
551 bdaddr_t src;
552 __u8 src_type;
553 __le16 psm;
554 __le16 sport;
555 __u16 dcid;
556 __u16 scid;
557
558 __u16 imtu;
559 __u16 omtu;
560 __u16 flush_to;
561 __u8 mode;
562 __u8 chan_type;
563 __u8 chan_policy;
564
565 __u8 sec_level;
566
567 __u8 ident;
568
569 __u8 conf_req[64];
570 __u8 conf_len;
571 __u8 num_conf_req;
572 __u8 num_conf_rsp;
573
574 __u8 fcs;
575
576 __u16 tx_win;
577 __u16 tx_win_max;
578 __u16 ack_win;
579 __u8 max_tx;
580 __u16 retrans_timeout;
581 __u16 monitor_timeout;
582 __u16 mps;
583
584 __u16 tx_credits;
585 __u16 rx_credits;
586
587 __u8 tx_state;
588 __u8 rx_state;
589
590 unsigned long conf_state;
591 unsigned long conn_state;
592 unsigned long flags;
593
594 __u8 remote_amp_id;
595 __u8 local_amp_id;
596 __u8 move_id;
597 __u8 move_state;
598 __u8 move_role;
599
600 __u16 next_tx_seq;
601 __u16 expected_ack_seq;
602 __u16 expected_tx_seq;
603 __u16 buffer_seq;
604 __u16 srej_save_reqseq;
605 __u16 last_acked_seq;
606 __u16 frames_sent;
607 __u16 unacked_frames;
608 __u8 retry_count;
609 __u16 sdu_len;
610 struct sk_buff *sdu;
611 struct sk_buff *sdu_last_frag;
612
613 __u16 remote_tx_win;
614 __u8 remote_max_tx;
615 __u16 remote_mps;
616
617 __u8 local_id;
618 __u8 local_stype;
619 __u16 local_msdu;
620 __u32 local_sdu_itime;
621 __u32 local_acc_lat;
622 __u32 local_flush_to;
623
624 __u8 remote_id;
625 __u8 remote_stype;
626 __u16 remote_msdu;
627 __u32 remote_sdu_itime;
628 __u32 remote_acc_lat;
629 __u32 remote_flush_to;
630
631 struct delayed_work chan_timer;
632 struct delayed_work retrans_timer;
633 struct delayed_work monitor_timer;
634 struct delayed_work ack_timer;
635
636 struct sk_buff *tx_send_head;
637 struct sk_buff_head tx_q;
638 struct sk_buff_head srej_q;
639 struct l2cap_seq_list srej_list;
640 struct l2cap_seq_list retrans_list;
641
642 struct list_head list;
643 struct list_head global_l;
644
645 void *data;
646 const struct l2cap_ops *ops;
647 struct mutex lock;
648};
649
650struct l2cap_ops {
651 char *name;
652
653 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan);
654 int (*recv) (struct l2cap_chan * chan,
655 struct sk_buff *skb);
656 void (*teardown) (struct l2cap_chan *chan, int err);
657 void (*close) (struct l2cap_chan *chan);
658 void (*state_change) (struct l2cap_chan *chan,
659 int state, int err);
660 void (*ready) (struct l2cap_chan *chan);
661 void (*defer) (struct l2cap_chan *chan);
662 void (*resume) (struct l2cap_chan *chan);
663 void (*suspend) (struct l2cap_chan *chan);
664 void (*set_shutdown) (struct l2cap_chan *chan);
665 long (*get_sndtimeo) (struct l2cap_chan *chan);
666 struct pid *(*get_peer_pid) (struct l2cap_chan *chan);
667 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan,
668 unsigned long hdr_len,
669 unsigned long len, int nb);
670 int (*filter) (struct l2cap_chan * chan,
671 struct sk_buff *skb);
672};
673
674struct l2cap_conn {
675 struct hci_conn *hcon;
676 struct hci_chan *hchan;
677
678 unsigned int mtu;
679
680 __u32 feat_mask;
681 __u8 remote_fixed_chan;
682 __u8 local_fixed_chan;
683
684 __u8 info_state;
685 __u8 info_ident;
686
687 struct delayed_work info_timer;
688
689 struct sk_buff *rx_skb;
690 __u32 rx_len;
691 __u8 tx_ident;
692 struct mutex ident_lock;
693
694 struct sk_buff_head pending_rx;
695 struct work_struct pending_rx_work;
696
697 struct delayed_work id_addr_timer;
698
699 __u8 disc_reason;
700
701 struct l2cap_chan *smp;
702
703 struct list_head chan_l;
704 struct mutex chan_lock;
705 struct kref ref;
706 struct list_head users;
707};
708
709struct l2cap_user {
710 struct list_head list;
711 int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
712 void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
713};
714
715#define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
716#define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
717#define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
718
719#define L2CAP_CHAN_RAW 1
720#define L2CAP_CHAN_CONN_LESS 2
721#define L2CAP_CHAN_CONN_ORIENTED 3
722#define L2CAP_CHAN_FIXED 4
723
724/* ----- L2CAP socket info ----- */
725#define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
726
727struct l2cap_pinfo {
728 struct bt_sock bt;
729 struct l2cap_chan *chan;
730 struct sk_buff *rx_busy_skb;
731};
732
733enum {
734 CONF_REQ_SENT,
735 CONF_INPUT_DONE,
736 CONF_OUTPUT_DONE,
737 CONF_MTU_DONE,
738 CONF_MODE_DONE,
739 CONF_CONNECT_PEND,
740 CONF_RECV_NO_FCS,
741 CONF_STATE2_DEVICE,
742 CONF_EWS_RECV,
743 CONF_LOC_CONF_PEND,
744 CONF_REM_CONF_PEND,
745 CONF_NOT_COMPLETE,
746};
747
748#define L2CAP_CONF_MAX_CONF_REQ 2
749#define L2CAP_CONF_MAX_CONF_RSP 2
750
751enum {
752 CONN_SREJ_SENT,
753 CONN_WAIT_F,
754 CONN_SREJ_ACT,
755 CONN_SEND_PBIT,
756 CONN_REMOTE_BUSY,
757 CONN_LOCAL_BUSY,
758 CONN_REJ_ACT,
759 CONN_SEND_FBIT,
760 CONN_RNR_SENT,
761};
762
763/* Definitions for flags in l2cap_chan */
764enum {
765 FLAG_ROLE_SWITCH,
766 FLAG_FORCE_ACTIVE,
767 FLAG_FORCE_RELIABLE,
768 FLAG_FLUSHABLE,
769 FLAG_EXT_CTRL,
770 FLAG_EFS_ENABLE,
771 FLAG_DEFER_SETUP,
772 FLAG_LE_CONN_REQ_SENT,
773 FLAG_ECRED_CONN_REQ_SENT,
774 FLAG_PENDING_SECURITY,
775 FLAG_HOLD_HCI_CONN,
776};
777
778/* Lock nesting levels for L2CAP channels. We need these because lockdep
779 * otherwise considers all channels equal and will e.g. complain about a
780 * connection oriented channel triggering SMP procedures or a listening
781 * channel creating and locking a child channel.
782 */
783enum {
784 L2CAP_NESTING_SMP,
785 L2CAP_NESTING_NORMAL,
786 L2CAP_NESTING_PARENT,
787};
788
789enum {
790 L2CAP_TX_STATE_XMIT,
791 L2CAP_TX_STATE_WAIT_F,
792};
793
794enum {
795 L2CAP_RX_STATE_RECV,
796 L2CAP_RX_STATE_SREJ_SENT,
797 L2CAP_RX_STATE_MOVE,
798 L2CAP_RX_STATE_WAIT_P,
799 L2CAP_RX_STATE_WAIT_F,
800};
801
802enum {
803 L2CAP_TXSEQ_EXPECTED,
804 L2CAP_TXSEQ_EXPECTED_SREJ,
805 L2CAP_TXSEQ_UNEXPECTED,
806 L2CAP_TXSEQ_UNEXPECTED_SREJ,
807 L2CAP_TXSEQ_DUPLICATE,
808 L2CAP_TXSEQ_DUPLICATE_SREJ,
809 L2CAP_TXSEQ_INVALID,
810 L2CAP_TXSEQ_INVALID_IGNORE,
811};
812
813enum {
814 L2CAP_EV_DATA_REQUEST,
815 L2CAP_EV_LOCAL_BUSY_DETECTED,
816 L2CAP_EV_LOCAL_BUSY_CLEAR,
817 L2CAP_EV_RECV_REQSEQ_AND_FBIT,
818 L2CAP_EV_RECV_FBIT,
819 L2CAP_EV_RETRANS_TO,
820 L2CAP_EV_MONITOR_TO,
821 L2CAP_EV_EXPLICIT_POLL,
822 L2CAP_EV_RECV_IFRAME,
823 L2CAP_EV_RECV_RR,
824 L2CAP_EV_RECV_REJ,
825 L2CAP_EV_RECV_RNR,
826 L2CAP_EV_RECV_SREJ,
827 L2CAP_EV_RECV_FRAME,
828};
829
830enum {
831 L2CAP_MOVE_ROLE_NONE,
832 L2CAP_MOVE_ROLE_INITIATOR,
833 L2CAP_MOVE_ROLE_RESPONDER,
834};
835
836enum {
837 L2CAP_MOVE_STABLE,
838 L2CAP_MOVE_WAIT_REQ,
839 L2CAP_MOVE_WAIT_RSP,
840 L2CAP_MOVE_WAIT_RSP_SUCCESS,
841 L2CAP_MOVE_WAIT_CONFIRM,
842 L2CAP_MOVE_WAIT_CONFIRM_RSP,
843 L2CAP_MOVE_WAIT_LOGICAL_COMP,
844 L2CAP_MOVE_WAIT_LOGICAL_CFM,
845 L2CAP_MOVE_WAIT_LOCAL_BUSY,
846 L2CAP_MOVE_WAIT_PREPARE,
847};
848
849void l2cap_chan_hold(struct l2cap_chan *c);
850struct l2cap_chan *l2cap_chan_hold_unless_zero(struct l2cap_chan *c);
851void l2cap_chan_put(struct l2cap_chan *c);
852
853static inline void l2cap_chan_lock(struct l2cap_chan *chan)
854{
855 mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting));
856}
857
858static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
859{
860 mutex_unlock(&chan->lock);
861}
862
863static inline void l2cap_set_timer(struct l2cap_chan *chan,
864 struct delayed_work *work, long timeout)
865{
866 BT_DBG("chan %p state %s timeout %ld", chan,
867 state_to_string(chan->state), timeout);
868
869 /* If delayed work cancelled do not hold(chan)
870 since it is already done with previous set_timer */
871 if (!cancel_delayed_work(work))
872 l2cap_chan_hold(chan);
873
874 schedule_delayed_work(work, timeout);
875}
876
877static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
878 struct delayed_work *work)
879{
880 bool ret;
881
882 /* put(chan) if delayed work cancelled otherwise it
883 is done in delayed work function */
884 ret = cancel_delayed_work(work);
885 if (ret)
886 l2cap_chan_put(chan);
887
888 return ret;
889}
890
891#define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
892#define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
893#define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
894#define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
895#define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
896 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
897#define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
898
899static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
900{
901 if (seq1 >= seq2)
902 return seq1 - seq2;
903 else
904 return chan->tx_win_max + 1 - seq2 + seq1;
905}
906
907static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
908{
909 return (seq + 1) % (chan->tx_win_max + 1);
910}
911
912static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
913{
914 return NULL;
915}
916
917static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
918{
919 return -ENOSYS;
920}
921
922static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
923 unsigned long hdr_len,
924 unsigned long len, int nb)
925{
926 return ERR_PTR(-ENOSYS);
927}
928
929static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
930{
931}
932
933static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
934{
935}
936
937static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
938{
939}
940
941static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
942 int state, int err)
943{
944}
945
946static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
947{
948}
949
950static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
951{
952}
953
954static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
955{
956}
957
958static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
959{
960}
961
962static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
963{
964 return 0;
965}
966
967extern bool disable_ertm;
968extern bool enable_ecred;
969
970int l2cap_init_sockets(void);
971void l2cap_cleanup_sockets(void);
972bool l2cap_is_socket(struct socket *sock);
973
974void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
975void __l2cap_ecred_conn_rsp_defer(struct l2cap_chan *chan);
976void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
977
978int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
979int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid);
980
981struct l2cap_chan *l2cap_chan_create(void);
982void l2cap_chan_close(struct l2cap_chan *chan, int reason);
983int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
984 bdaddr_t *dst, u8 dst_type);
985int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu);
986int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
987void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
988int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
989void l2cap_chan_set_defaults(struct l2cap_chan *chan);
990int l2cap_ertm_init(struct l2cap_chan *chan);
991void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
992void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
993typedef void (*l2cap_chan_func_t)(struct l2cap_chan *chan, void *data);
994void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func,
995 void *data);
996void l2cap_chan_del(struct l2cap_chan *chan, int err);
997void l2cap_send_conn_req(struct l2cap_chan *chan);
998void l2cap_move_start(struct l2cap_chan *chan);
999void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
1000 u8 status);
1001void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
1002
1003struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
1004void l2cap_conn_put(struct l2cap_conn *conn);
1005
1006int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
1007void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
1008
1009#endif /* __L2CAP_H */