xref: /openbmc/linux/include/net/bluetooth/l2cap.h (revision a9a741a7)
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_DEFAULT_TX_WINDOW		63
37 #define L2CAP_DEFAULT_EXT_WINDOW	0x3FFF
38 #define L2CAP_DEFAULT_MAX_TX		3
39 #define L2CAP_DEFAULT_RETRANS_TO	2000    /* 2 seconds */
40 #define L2CAP_DEFAULT_MONITOR_TO	12000   /* 12 seconds */
41 #define L2CAP_DEFAULT_MAX_PDU_SIZE	1009    /* Sized for 3-DH5 packet */
42 #define L2CAP_DEFAULT_ACK_TO		200
43 #define L2CAP_DEFAULT_MAX_SDU_SIZE	0xFFFF
44 #define L2CAP_DEFAULT_SDU_ITIME		0xFFFFFFFF
45 #define L2CAP_DEFAULT_ACC_LAT		0xFFFFFFFF
46 #define L2CAP_BREDR_MAX_PAYLOAD		1019    /* 3-DH5 packet */
47 #define L2CAP_LE_MIN_MTU		23
48 
49 #define L2CAP_DISC_TIMEOUT		msecs_to_jiffies(100)
50 #define L2CAP_DISC_REJ_TIMEOUT		msecs_to_jiffies(5000)
51 #define L2CAP_ENC_TIMEOUT		msecs_to_jiffies(5000)
52 #define L2CAP_CONN_TIMEOUT		msecs_to_jiffies(40000)
53 #define L2CAP_INFO_TIMEOUT		msecs_to_jiffies(4000)
54 
55 #define L2CAP_A2MP_DEFAULT_MTU		670
56 
57 /* L2CAP socket address */
58 struct sockaddr_l2 {
59 	sa_family_t	l2_family;
60 	__le16		l2_psm;
61 	bdaddr_t	l2_bdaddr;
62 	__le16		l2_cid;
63 	__u8		l2_bdaddr_type;
64 };
65 
66 /* L2CAP socket options */
67 #define L2CAP_OPTIONS	0x01
68 struct l2cap_options {
69 	__u16 omtu;
70 	__u16 imtu;
71 	__u16 flush_to;
72 	__u8  mode;
73 	__u8  fcs;
74 	__u8  max_tx;
75 	__u16 txwin_size;
76 };
77 
78 #define L2CAP_CONNINFO	0x02
79 struct l2cap_conninfo {
80 	__u16 hci_handle;
81 	__u8  dev_class[3];
82 };
83 
84 #define L2CAP_LM	0x03
85 #define L2CAP_LM_MASTER		0x0001
86 #define L2CAP_LM_AUTH		0x0002
87 #define L2CAP_LM_ENCRYPT	0x0004
88 #define L2CAP_LM_TRUSTED	0x0008
89 #define L2CAP_LM_RELIABLE	0x0010
90 #define L2CAP_LM_SECURE		0x0020
91 
92 /* L2CAP command codes */
93 #define L2CAP_COMMAND_REJ	0x01
94 #define L2CAP_CONN_REQ		0x02
95 #define L2CAP_CONN_RSP		0x03
96 #define L2CAP_CONF_REQ		0x04
97 #define L2CAP_CONF_RSP		0x05
98 #define L2CAP_DISCONN_REQ	0x06
99 #define L2CAP_DISCONN_RSP	0x07
100 #define L2CAP_ECHO_REQ		0x08
101 #define L2CAP_ECHO_RSP		0x09
102 #define L2CAP_INFO_REQ		0x0a
103 #define L2CAP_INFO_RSP		0x0b
104 #define L2CAP_CREATE_CHAN_REQ	0x0c
105 #define L2CAP_CREATE_CHAN_RSP	0x0d
106 #define L2CAP_MOVE_CHAN_REQ	0x0e
107 #define L2CAP_MOVE_CHAN_RSP	0x0f
108 #define L2CAP_MOVE_CHAN_CFM	0x10
109 #define L2CAP_MOVE_CHAN_CFM_RSP	0x11
110 #define L2CAP_CONN_PARAM_UPDATE_REQ	0x12
111 #define L2CAP_CONN_PARAM_UPDATE_RSP	0x13
112 
113 /* L2CAP extended feature mask */
114 #define L2CAP_FEAT_FLOWCTL	0x00000001
115 #define L2CAP_FEAT_RETRANS	0x00000002
116 #define L2CAP_FEAT_BIDIR_QOS	0x00000004
117 #define L2CAP_FEAT_ERTM		0x00000008
118 #define L2CAP_FEAT_STREAMING	0x00000010
119 #define L2CAP_FEAT_FCS		0x00000020
120 #define L2CAP_FEAT_EXT_FLOW	0x00000040
121 #define L2CAP_FEAT_FIXED_CHAN	0x00000080
122 #define L2CAP_FEAT_EXT_WINDOW	0x00000100
123 #define L2CAP_FEAT_UCD		0x00000200
124 
125 /* L2CAP checksum option */
126 #define L2CAP_FCS_NONE		0x00
127 #define L2CAP_FCS_CRC16		0x01
128 
129 /* L2CAP fixed channels */
130 #define L2CAP_FC_L2CAP		0x02
131 #define L2CAP_FC_A2MP		0x08
132 
133 /* L2CAP Control Field bit masks */
134 #define L2CAP_CTRL_SAR			0xC000
135 #define L2CAP_CTRL_REQSEQ		0x3F00
136 #define L2CAP_CTRL_TXSEQ		0x007E
137 #define L2CAP_CTRL_SUPERVISE		0x000C
138 
139 #define L2CAP_CTRL_RETRANS		0x0080
140 #define L2CAP_CTRL_FINAL		0x0080
141 #define L2CAP_CTRL_POLL			0x0010
142 #define L2CAP_CTRL_FRAME_TYPE		0x0001 /* I- or S-Frame */
143 
144 #define L2CAP_CTRL_TXSEQ_SHIFT		1
145 #define L2CAP_CTRL_SUPER_SHIFT		2
146 #define L2CAP_CTRL_POLL_SHIFT		4
147 #define L2CAP_CTRL_FINAL_SHIFT		7
148 #define L2CAP_CTRL_REQSEQ_SHIFT		8
149 #define L2CAP_CTRL_SAR_SHIFT		14
150 
151 /* L2CAP Extended Control Field bit mask */
152 #define L2CAP_EXT_CTRL_TXSEQ		0xFFFC0000
153 #define L2CAP_EXT_CTRL_SAR		0x00030000
154 #define L2CAP_EXT_CTRL_SUPERVISE	0x00030000
155 #define L2CAP_EXT_CTRL_REQSEQ		0x0000FFFC
156 
157 #define L2CAP_EXT_CTRL_POLL		0x00040000
158 #define L2CAP_EXT_CTRL_FINAL		0x00000002
159 #define L2CAP_EXT_CTRL_FRAME_TYPE	0x00000001 /* I- or S-Frame */
160 
161 #define L2CAP_EXT_CTRL_FINAL_SHIFT	1
162 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT	2
163 #define L2CAP_EXT_CTRL_SAR_SHIFT	16
164 #define L2CAP_EXT_CTRL_SUPER_SHIFT	16
165 #define L2CAP_EXT_CTRL_POLL_SHIFT	18
166 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT	18
167 
168 /* L2CAP Supervisory Function */
169 #define L2CAP_SUPER_RR		0x00
170 #define L2CAP_SUPER_REJ		0x01
171 #define L2CAP_SUPER_RNR		0x02
172 #define L2CAP_SUPER_SREJ	0x03
173 
174 /* L2CAP Segmentation and Reassembly */
175 #define L2CAP_SAR_UNSEGMENTED	0x00
176 #define L2CAP_SAR_START		0x01
177 #define L2CAP_SAR_END		0x02
178 #define L2CAP_SAR_CONTINUE	0x03
179 
180 /* L2CAP Command rej. reasons */
181 #define L2CAP_REJ_NOT_UNDERSTOOD	0x0000
182 #define L2CAP_REJ_MTU_EXCEEDED		0x0001
183 #define L2CAP_REJ_INVALID_CID		0x0002
184 
185 /* L2CAP structures */
186 struct l2cap_hdr {
187 	__le16     len;
188 	__le16     cid;
189 } __packed;
190 #define L2CAP_HDR_SIZE		4
191 #define L2CAP_ENH_HDR_SIZE	6
192 #define L2CAP_EXT_HDR_SIZE	8
193 
194 #define L2CAP_FCS_SIZE		2
195 #define L2CAP_SDULEN_SIZE	2
196 #define L2CAP_PSMLEN_SIZE	2
197 #define L2CAP_ENH_CTRL_SIZE	2
198 #define L2CAP_EXT_CTRL_SIZE	4
199 
200 struct l2cap_cmd_hdr {
201 	__u8       code;
202 	__u8       ident;
203 	__le16     len;
204 } __packed;
205 #define L2CAP_CMD_HDR_SIZE	4
206 
207 struct l2cap_cmd_rej_unk {
208 	__le16     reason;
209 } __packed;
210 
211 struct l2cap_cmd_rej_mtu {
212 	__le16     reason;
213 	__le16     max_mtu;
214 } __packed;
215 
216 struct l2cap_cmd_rej_cid {
217 	__le16     reason;
218 	__le16     scid;
219 	__le16     dcid;
220 } __packed;
221 
222 struct l2cap_conn_req {
223 	__le16     psm;
224 	__le16     scid;
225 } __packed;
226 
227 struct l2cap_conn_rsp {
228 	__le16     dcid;
229 	__le16     scid;
230 	__le16     result;
231 	__le16     status;
232 } __packed;
233 
234 /* protocol/service multiplexer (PSM) */
235 #define L2CAP_PSM_SDP		0x0001
236 #define L2CAP_PSM_RFCOMM	0x0003
237 
238 /* channel indentifier */
239 #define L2CAP_CID_SIGNALING	0x0001
240 #define L2CAP_CID_CONN_LESS	0x0002
241 #define L2CAP_CID_A2MP		0x0003
242 #define L2CAP_CID_LE_DATA	0x0004
243 #define L2CAP_CID_LE_SIGNALING	0x0005
244 #define L2CAP_CID_SMP		0x0006
245 #define L2CAP_CID_DYN_START	0x0040
246 #define L2CAP_CID_DYN_END	0xffff
247 
248 /* connect/create channel results */
249 #define L2CAP_CR_SUCCESS	0x0000
250 #define L2CAP_CR_PEND		0x0001
251 #define L2CAP_CR_BAD_PSM	0x0002
252 #define L2CAP_CR_SEC_BLOCK	0x0003
253 #define L2CAP_CR_NO_MEM		0x0004
254 #define L2CAP_CR_BAD_AMP	0x0005
255 
256 /* connect/create channel status */
257 #define L2CAP_CS_NO_INFO	0x0000
258 #define L2CAP_CS_AUTHEN_PEND	0x0001
259 #define L2CAP_CS_AUTHOR_PEND	0x0002
260 
261 struct l2cap_conf_req {
262 	__le16     dcid;
263 	__le16     flags;
264 	__u8       data[0];
265 } __packed;
266 
267 struct l2cap_conf_rsp {
268 	__le16     scid;
269 	__le16     flags;
270 	__le16     result;
271 	__u8       data[0];
272 } __packed;
273 
274 #define L2CAP_CONF_SUCCESS	0x0000
275 #define L2CAP_CONF_UNACCEPT	0x0001
276 #define L2CAP_CONF_REJECT	0x0002
277 #define L2CAP_CONF_UNKNOWN	0x0003
278 #define L2CAP_CONF_PENDING	0x0004
279 #define L2CAP_CONF_EFS_REJECT	0x0005
280 
281 /* configuration req/rsp continuation flag */
282 #define L2CAP_CONF_FLAG_CONTINUATION	0x0001
283 
284 struct l2cap_conf_opt {
285 	__u8       type;
286 	__u8       len;
287 	__u8       val[0];
288 } __packed;
289 #define L2CAP_CONF_OPT_SIZE	2
290 
291 #define L2CAP_CONF_HINT		0x80
292 #define L2CAP_CONF_MASK		0x7f
293 
294 #define L2CAP_CONF_MTU		0x01
295 #define L2CAP_CONF_FLUSH_TO	0x02
296 #define L2CAP_CONF_QOS		0x03
297 #define L2CAP_CONF_RFC		0x04
298 #define L2CAP_CONF_FCS		0x05
299 #define L2CAP_CONF_EFS		0x06
300 #define L2CAP_CONF_EWS		0x07
301 
302 #define L2CAP_CONF_MAX_SIZE	22
303 
304 struct l2cap_conf_rfc {
305 	__u8       mode;
306 	__u8       txwin_size;
307 	__u8       max_transmit;
308 	__le16     retrans_timeout;
309 	__le16     monitor_timeout;
310 	__le16     max_pdu_size;
311 } __packed;
312 
313 #define L2CAP_MODE_BASIC	0x00
314 #define L2CAP_MODE_RETRANS	0x01
315 #define L2CAP_MODE_FLOWCTL	0x02
316 #define L2CAP_MODE_ERTM		0x03
317 #define L2CAP_MODE_STREAMING	0x04
318 
319 struct l2cap_conf_efs {
320 	__u8	id;
321 	__u8	stype;
322 	__le16	msdu;
323 	__le32	sdu_itime;
324 	__le32	acc_lat;
325 	__le32	flush_to;
326 } __packed;
327 
328 #define L2CAP_SERV_NOTRAFIC	0x00
329 #define L2CAP_SERV_BESTEFFORT	0x01
330 #define L2CAP_SERV_GUARANTEED	0x02
331 
332 #define L2CAP_BESTEFFORT_ID	0x01
333 
334 struct l2cap_disconn_req {
335 	__le16     dcid;
336 	__le16     scid;
337 } __packed;
338 
339 struct l2cap_disconn_rsp {
340 	__le16     dcid;
341 	__le16     scid;
342 } __packed;
343 
344 struct l2cap_info_req {
345 	__le16      type;
346 } __packed;
347 
348 struct l2cap_info_rsp {
349 	__le16      type;
350 	__le16      result;
351 	__u8        data[0];
352 } __packed;
353 
354 struct l2cap_create_chan_req {
355 	__le16      psm;
356 	__le16      scid;
357 	__u8        amp_id;
358 } __packed;
359 
360 struct l2cap_create_chan_rsp {
361 	__le16      dcid;
362 	__le16      scid;
363 	__le16      result;
364 	__le16      status;
365 } __packed;
366 
367 struct l2cap_move_chan_req {
368 	__le16      icid;
369 	__u8        dest_amp_id;
370 } __packed;
371 
372 struct l2cap_move_chan_rsp {
373 	__le16      icid;
374 	__le16      result;
375 } __packed;
376 
377 #define L2CAP_MR_SUCCESS	0x0000
378 #define L2CAP_MR_PEND		0x0001
379 #define L2CAP_MR_BAD_ID		0x0002
380 #define L2CAP_MR_SAME_ID	0x0003
381 #define L2CAP_MR_NOT_SUPP	0x0004
382 #define L2CAP_MR_COLLISION	0x0005
383 #define L2CAP_MR_NOT_ALLOWED	0x0006
384 
385 struct l2cap_move_chan_cfm {
386 	__le16      icid;
387 	__le16      result;
388 } __packed;
389 
390 #define L2CAP_MC_CONFIRMED	0x0000
391 #define L2CAP_MC_UNCONFIRMED	0x0001
392 
393 struct l2cap_move_chan_cfm_rsp {
394 	__le16      icid;
395 } __packed;
396 
397 /* info type */
398 #define L2CAP_IT_CL_MTU		0x0001
399 #define L2CAP_IT_FEAT_MASK	0x0002
400 #define L2CAP_IT_FIXED_CHAN	0x0003
401 
402 /* info result */
403 #define L2CAP_IR_SUCCESS	0x0000
404 #define L2CAP_IR_NOTSUPP	0x0001
405 
406 struct l2cap_conn_param_update_req {
407 	__le16      min;
408 	__le16      max;
409 	__le16      latency;
410 	__le16      to_multiplier;
411 } __packed;
412 
413 struct l2cap_conn_param_update_rsp {
414 	__le16      result;
415 } __packed;
416 
417 /* Connection Parameters result */
418 #define L2CAP_CONN_PARAM_ACCEPTED	0x0000
419 #define L2CAP_CONN_PARAM_REJECTED	0x0001
420 
421 /* ----- L2CAP channels and connections ----- */
422 struct l2cap_seq_list {
423 	__u16	head;
424 	__u16	tail;
425 	__u16	mask;
426 	__u16	*list;
427 };
428 
429 #define L2CAP_SEQ_LIST_CLEAR	0xFFFF
430 #define L2CAP_SEQ_LIST_TAIL	0x8000
431 
432 struct l2cap_chan {
433 	struct sock *sk;
434 
435 	struct l2cap_conn	*conn;
436 
437 	__u8		state;
438 
439 	atomic_t	refcnt;
440 
441 	__le16		psm;
442 	__u16		dcid;
443 	__u16		scid;
444 
445 	__u16		imtu;
446 	__u16		omtu;
447 	__u16		flush_to;
448 	__u8		mode;
449 	__u8		chan_type;
450 	__u8		chan_policy;
451 
452 	__le16		sport;
453 
454 	__u8		sec_level;
455 
456 	__u8		ident;
457 
458 	__u8		conf_req[64];
459 	__u8		conf_len;
460 	__u8		num_conf_req;
461 	__u8		num_conf_rsp;
462 
463 	__u8		fcs;
464 
465 	__u16		tx_win;
466 	__u16		tx_win_max;
467 	__u8		max_tx;
468 	__u16		retrans_timeout;
469 	__u16		monitor_timeout;
470 	__u16		mps;
471 
472 	__u8		tx_state;
473 	__u8		rx_state;
474 
475 	unsigned long	conf_state;
476 	unsigned long	conn_state;
477 	unsigned long	flags;
478 
479 	__u16		next_tx_seq;
480 	__u16		expected_ack_seq;
481 	__u16		expected_tx_seq;
482 	__u16		buffer_seq;
483 	__u16		srej_save_reqseq;
484 	__u16		last_acked_seq;
485 	__u16		frames_sent;
486 	__u16		unacked_frames;
487 	__u8		retry_count;
488 	__u16		srej_queue_next;
489 	__u16		sdu_len;
490 	struct sk_buff	*sdu;
491 	struct sk_buff	*sdu_last_frag;
492 
493 	__u16		remote_tx_win;
494 	__u8		remote_max_tx;
495 	__u16		remote_mps;
496 
497 	__u8		local_id;
498 	__u8		local_stype;
499 	__u16		local_msdu;
500 	__u32		local_sdu_itime;
501 	__u32		local_acc_lat;
502 	__u32		local_flush_to;
503 
504 	__u8		remote_id;
505 	__u8		remote_stype;
506 	__u16		remote_msdu;
507 	__u32		remote_sdu_itime;
508 	__u32		remote_acc_lat;
509 	__u32		remote_flush_to;
510 
511 	struct delayed_work	chan_timer;
512 	struct delayed_work	retrans_timer;
513 	struct delayed_work	monitor_timer;
514 	struct delayed_work	ack_timer;
515 
516 	struct sk_buff		*tx_send_head;
517 	struct sk_buff_head	tx_q;
518 	struct sk_buff_head	srej_q;
519 	struct l2cap_seq_list	srej_list;
520 	struct l2cap_seq_list	retrans_list;
521 
522 	struct list_head	list;
523 	struct list_head	global_l;
524 
525 	void			*data;
526 	struct l2cap_ops	*ops;
527 	struct mutex		lock;
528 };
529 
530 struct l2cap_ops {
531 	char			*name;
532 
533 	struct l2cap_chan	*(*new_connection) (struct l2cap_chan *chan);
534 	int			(*recv) (struct l2cap_chan * chan,
535 					 struct sk_buff *skb);
536 	void			(*teardown) (struct l2cap_chan *chan, int err);
537 	void			(*close) (struct l2cap_chan *chan);
538 	void			(*state_change) (struct l2cap_chan *chan,
539 						 int state);
540 	void			(*ready) (struct l2cap_chan *chan);
541 	struct sk_buff		*(*alloc_skb) (struct l2cap_chan *chan,
542 					       unsigned long len, int nb);
543 };
544 
545 struct l2cap_conn {
546 	struct hci_conn		*hcon;
547 	struct hci_chan		*hchan;
548 
549 	bdaddr_t		*dst;
550 	bdaddr_t		*src;
551 
552 	unsigned int		mtu;
553 
554 	__u32			feat_mask;
555 	__u8			fixed_chan_mask;
556 
557 	__u8			info_state;
558 	__u8			info_ident;
559 
560 	struct delayed_work	info_timer;
561 
562 	spinlock_t		lock;
563 
564 	struct sk_buff		*rx_skb;
565 	__u32			rx_len;
566 	__u8			tx_ident;
567 
568 	__u8			disc_reason;
569 
570 	struct delayed_work	security_timer;
571 	struct smp_chan		*smp_chan;
572 
573 	struct list_head	chan_l;
574 	struct mutex		chan_lock;
575 };
576 
577 #define L2CAP_INFO_CL_MTU_REQ_SENT	0x01
578 #define L2CAP_INFO_FEAT_MASK_REQ_SENT	0x04
579 #define L2CAP_INFO_FEAT_MASK_REQ_DONE	0x08
580 
581 #define L2CAP_CHAN_RAW			1
582 #define L2CAP_CHAN_CONN_LESS		2
583 #define L2CAP_CHAN_CONN_ORIENTED	3
584 #define L2CAP_CHAN_CONN_FIX_A2MP	4
585 
586 /* ----- L2CAP socket info ----- */
587 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
588 
589 struct l2cap_pinfo {
590 	struct bt_sock		bt;
591 	struct l2cap_chan	*chan;
592 	struct sk_buff		*rx_busy_skb;
593 };
594 
595 enum {
596 	CONF_REQ_SENT,
597 	CONF_INPUT_DONE,
598 	CONF_OUTPUT_DONE,
599 	CONF_MTU_DONE,
600 	CONF_MODE_DONE,
601 	CONF_CONNECT_PEND,
602 	CONF_NO_FCS_RECV,
603 	CONF_STATE2_DEVICE,
604 	CONF_EWS_RECV,
605 	CONF_LOC_CONF_PEND,
606 	CONF_REM_CONF_PEND,
607 	CONF_NOT_COMPLETE,
608 };
609 
610 #define L2CAP_CONF_MAX_CONF_REQ 2
611 #define L2CAP_CONF_MAX_CONF_RSP 2
612 
613 enum {
614 	CONN_SREJ_SENT,
615 	CONN_WAIT_F,
616 	CONN_SREJ_ACT,
617 	CONN_SEND_PBIT,
618 	CONN_REMOTE_BUSY,
619 	CONN_LOCAL_BUSY,
620 	CONN_REJ_ACT,
621 	CONN_SEND_FBIT,
622 	CONN_RNR_SENT,
623 };
624 
625 /* Definitions for flags in l2cap_chan */
626 enum {
627 	FLAG_ROLE_SWITCH,
628 	FLAG_FORCE_ACTIVE,
629 	FLAG_FORCE_RELIABLE,
630 	FLAG_FLUSHABLE,
631 	FLAG_EXT_CTRL,
632 	FLAG_EFS_ENABLE,
633 };
634 
635 enum {
636 	L2CAP_TX_STATE_XMIT,
637 	L2CAP_TX_STATE_WAIT_F,
638 };
639 
640 enum {
641 	L2CAP_RX_STATE_RECV,
642 	L2CAP_RX_STATE_SREJ_SENT,
643 };
644 
645 enum {
646 	L2CAP_TXSEQ_EXPECTED,
647 	L2CAP_TXSEQ_EXPECTED_SREJ,
648 	L2CAP_TXSEQ_UNEXPECTED,
649 	L2CAP_TXSEQ_UNEXPECTED_SREJ,
650 	L2CAP_TXSEQ_DUPLICATE,
651 	L2CAP_TXSEQ_DUPLICATE_SREJ,
652 	L2CAP_TXSEQ_INVALID,
653 	L2CAP_TXSEQ_INVALID_IGNORE,
654 };
655 
656 enum {
657 	L2CAP_EV_DATA_REQUEST,
658 	L2CAP_EV_LOCAL_BUSY_DETECTED,
659 	L2CAP_EV_LOCAL_BUSY_CLEAR,
660 	L2CAP_EV_RECV_REQSEQ_AND_FBIT,
661 	L2CAP_EV_RECV_FBIT,
662 	L2CAP_EV_RETRANS_TO,
663 	L2CAP_EV_MONITOR_TO,
664 	L2CAP_EV_EXPLICIT_POLL,
665 	L2CAP_EV_RECV_IFRAME,
666 	L2CAP_EV_RECV_RR,
667 	L2CAP_EV_RECV_REJ,
668 	L2CAP_EV_RECV_RNR,
669 	L2CAP_EV_RECV_SREJ,
670 	L2CAP_EV_RECV_FRAME,
671 };
672 
673 static inline void l2cap_chan_hold(struct l2cap_chan *c)
674 {
675 	atomic_inc(&c->refcnt);
676 }
677 
678 static inline void l2cap_chan_put(struct l2cap_chan *c)
679 {
680 	if (atomic_dec_and_test(&c->refcnt))
681 		kfree(c);
682 }
683 
684 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
685 {
686 	mutex_lock(&chan->lock);
687 }
688 
689 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
690 {
691 	mutex_unlock(&chan->lock);
692 }
693 
694 static inline void l2cap_set_timer(struct l2cap_chan *chan,
695 				   struct delayed_work *work, long timeout)
696 {
697 	BT_DBG("chan %p state %s timeout %ld", chan,
698 	       state_to_string(chan->state), timeout);
699 
700 	/* If delayed work cancelled do not hold(chan)
701 	   since it is already done with previous set_timer */
702 	if (!cancel_delayed_work(work))
703 		l2cap_chan_hold(chan);
704 
705 	schedule_delayed_work(work, timeout);
706 }
707 
708 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
709 				     struct delayed_work *work)
710 {
711 	bool ret;
712 
713 	/* put(chan) if delayed work cancelled otherwise it
714 	   is done in delayed work function */
715 	ret = cancel_delayed_work(work);
716 	if (ret)
717 		l2cap_chan_put(chan);
718 
719 	return ret;
720 }
721 
722 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
723 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
724 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
725 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
726 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
727 		msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
728 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
729 
730 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
731 {
732 	if (seq1 >= seq2)
733 		return seq1 - seq2;
734 	else
735 		return chan->tx_win_max + 1 - seq2 + seq1;
736 }
737 
738 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
739 {
740 	return (seq + 1) % (chan->tx_win_max + 1);
741 }
742 
743 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
744 {
745 	return NULL;
746 }
747 
748 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
749 {
750 }
751 
752 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
753 {
754 }
755 
756 extern bool disable_ertm;
757 
758 int l2cap_init_sockets(void);
759 void l2cap_cleanup_sockets(void);
760 
761 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
762 int __l2cap_wait_ack(struct sock *sk);
763 
764 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
765 int l2cap_add_scid(struct l2cap_chan *chan,  __u16 scid);
766 
767 struct l2cap_chan *l2cap_chan_create(void);
768 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
769 void l2cap_chan_destroy(struct l2cap_chan *chan);
770 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
771 		       bdaddr_t *dst, u8 dst_type);
772 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
773 								u32 priority);
774 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
775 int l2cap_chan_check_security(struct l2cap_chan *chan);
776 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
777 int l2cap_ertm_init(struct l2cap_chan *chan);
778 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
779 void l2cap_chan_del(struct l2cap_chan *chan, int err);
780 
781 #endif /* __L2CAP_H */
782