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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/* L2CAP defaults */
31#define L2CAP_DEFAULT_MTU 672
32#define L2CAP_DEFAULT_MIN_MTU 48
33#define L2CAP_DEFAULT_FLUSH_TO 0xffff
34#define L2CAP_DEFAULT_TX_WINDOW 63
35#define L2CAP_DEFAULT_MAX_TX 3
36#define L2CAP_DEFAULT_RETRANS_TO 2000 /* 2 seconds */
37#define L2CAP_DEFAULT_MONITOR_TO 12000 /* 12 seconds */
38#define L2CAP_DEFAULT_MAX_PDU_SIZE 1009 /* Sized for 3-DH5 packet */
39#define L2CAP_DEFAULT_ACK_TO 200
40#define L2CAP_LE_DEFAULT_MTU 23
41
42#define L2CAP_CONN_TIMEOUT (40000) /* 40 seconds */
43#define L2CAP_INFO_TIMEOUT (4000) /* 4 seconds */
44
45/* L2CAP socket address */
46struct sockaddr_l2 {
47 sa_family_t l2_family;
48 __le16 l2_psm;
49 bdaddr_t l2_bdaddr;
50 __le16 l2_cid;
51};
52
53/* L2CAP socket options */
54#define L2CAP_OPTIONS 0x01
55struct l2cap_options {
56 __u16 omtu;
57 __u16 imtu;
58 __u16 flush_to;
59 __u8 mode;
60 __u8 fcs;
61 __u8 max_tx;
62 __u16 txwin_size;
63};
64
65#define L2CAP_CONNINFO 0x02
66struct l2cap_conninfo {
67 __u16 hci_handle;
68 __u8 dev_class[3];
69};
70
71#define L2CAP_LM 0x03
72#define L2CAP_LM_MASTER 0x0001
73#define L2CAP_LM_AUTH 0x0002
74#define L2CAP_LM_ENCRYPT 0x0004
75#define L2CAP_LM_TRUSTED 0x0008
76#define L2CAP_LM_RELIABLE 0x0010
77#define L2CAP_LM_SECURE 0x0020
78
79/* L2CAP command codes */
80#define L2CAP_COMMAND_REJ 0x01
81#define L2CAP_CONN_REQ 0x02
82#define L2CAP_CONN_RSP 0x03
83#define L2CAP_CONF_REQ 0x04
84#define L2CAP_CONF_RSP 0x05
85#define L2CAP_DISCONN_REQ 0x06
86#define L2CAP_DISCONN_RSP 0x07
87#define L2CAP_ECHO_REQ 0x08
88#define L2CAP_ECHO_RSP 0x09
89#define L2CAP_INFO_REQ 0x0a
90#define L2CAP_INFO_RSP 0x0b
91#define L2CAP_CONN_PARAM_UPDATE_REQ 0x12
92#define L2CAP_CONN_PARAM_UPDATE_RSP 0x13
93
94/* L2CAP feature mask */
95#define L2CAP_FEAT_FLOWCTL 0x00000001
96#define L2CAP_FEAT_RETRANS 0x00000002
97#define L2CAP_FEAT_ERTM 0x00000008
98#define L2CAP_FEAT_STREAMING 0x00000010
99#define L2CAP_FEAT_FCS 0x00000020
100#define L2CAP_FEAT_FIXED_CHAN 0x00000080
101
102/* L2CAP checksum option */
103#define L2CAP_FCS_NONE 0x00
104#define L2CAP_FCS_CRC16 0x01
105
106/* L2CAP Control Field bit masks */
107#define L2CAP_CTRL_SAR 0xC000
108#define L2CAP_CTRL_REQSEQ 0x3F00
109#define L2CAP_CTRL_TXSEQ 0x007E
110#define L2CAP_CTRL_RETRANS 0x0080
111#define L2CAP_CTRL_FINAL 0x0080
112#define L2CAP_CTRL_POLL 0x0010
113#define L2CAP_CTRL_SUPERVISE 0x000C
114#define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */
115
116#define L2CAP_CTRL_TXSEQ_SHIFT 1
117#define L2CAP_CTRL_REQSEQ_SHIFT 8
118#define L2CAP_CTRL_SAR_SHIFT 14
119
120/* L2CAP Supervisory Function */
121#define L2CAP_SUPER_RCV_READY 0x0000
122#define L2CAP_SUPER_REJECT 0x0004
123#define L2CAP_SUPER_RCV_NOT_READY 0x0008
124#define L2CAP_SUPER_SELECT_REJECT 0x000C
125
126/* L2CAP Segmentation and Reassembly */
127#define L2CAP_SDU_UNSEGMENTED 0x0000
128#define L2CAP_SDU_START 0x4000
129#define L2CAP_SDU_END 0x8000
130#define L2CAP_SDU_CONTINUE 0xC000
131
132/* L2CAP Command rej. reasons */
133#define L2CAP_REJ_NOT_UNDERSTOOD 0x0000
134#define L2CAP_REJ_MTU_EXCEEDED 0x0001
135#define L2CAP_REJ_INVALID_CID 0x0002
136
137
138/* L2CAP structures */
139struct l2cap_hdr {
140 __le16 len;
141 __le16 cid;
142} __packed;
143#define L2CAP_HDR_SIZE 4
144
145struct l2cap_cmd_hdr {
146 __u8 code;
147 __u8 ident;
148 __le16 len;
149} __packed;
150#define L2CAP_CMD_HDR_SIZE 4
151
152struct l2cap_cmd_rej_unk {
153 __le16 reason;
154} __packed;
155
156struct l2cap_cmd_rej_mtu {
157 __le16 reason;
158 __le16 max_mtu;
159} __packed;
160
161struct l2cap_cmd_rej_cid {
162 __le16 reason;
163 __le16 scid;
164 __le16 dcid;
165} __packed;
166
167struct l2cap_conn_req {
168 __le16 psm;
169 __le16 scid;
170} __packed;
171
172struct l2cap_conn_rsp {
173 __le16 dcid;
174 __le16 scid;
175 __le16 result;
176 __le16 status;
177} __packed;
178
179/* channel indentifier */
180#define L2CAP_CID_SIGNALING 0x0001
181#define L2CAP_CID_CONN_LESS 0x0002
182#define L2CAP_CID_LE_DATA 0x0004
183#define L2CAP_CID_LE_SIGNALING 0x0005
184#define L2CAP_CID_SMP 0x0006
185#define L2CAP_CID_DYN_START 0x0040
186#define L2CAP_CID_DYN_END 0xffff
187
188/* connect result */
189#define L2CAP_CR_SUCCESS 0x0000
190#define L2CAP_CR_PEND 0x0001
191#define L2CAP_CR_BAD_PSM 0x0002
192#define L2CAP_CR_SEC_BLOCK 0x0003
193#define L2CAP_CR_NO_MEM 0x0004
194
195/* connect status */
196#define L2CAP_CS_NO_INFO 0x0000
197#define L2CAP_CS_AUTHEN_PEND 0x0001
198#define L2CAP_CS_AUTHOR_PEND 0x0002
199
200struct l2cap_conf_req {
201 __le16 dcid;
202 __le16 flags;
203 __u8 data[0];
204} __packed;
205
206struct l2cap_conf_rsp {
207 __le16 scid;
208 __le16 flags;
209 __le16 result;
210 __u8 data[0];
211} __packed;
212
213#define L2CAP_CONF_SUCCESS 0x0000
214#define L2CAP_CONF_UNACCEPT 0x0001
215#define L2CAP_CONF_REJECT 0x0002
216#define L2CAP_CONF_UNKNOWN 0x0003
217
218struct l2cap_conf_opt {
219 __u8 type;
220 __u8 len;
221 __u8 val[0];
222} __packed;
223#define L2CAP_CONF_OPT_SIZE 2
224
225#define L2CAP_CONF_HINT 0x80
226#define L2CAP_CONF_MASK 0x7f
227
228#define L2CAP_CONF_MTU 0x01
229#define L2CAP_CONF_FLUSH_TO 0x02
230#define L2CAP_CONF_QOS 0x03
231#define L2CAP_CONF_RFC 0x04
232#define L2CAP_CONF_FCS 0x05
233
234#define L2CAP_CONF_MAX_SIZE 22
235
236struct l2cap_conf_rfc {
237 __u8 mode;
238 __u8 txwin_size;
239 __u8 max_transmit;
240 __le16 retrans_timeout;
241 __le16 monitor_timeout;
242 __le16 max_pdu_size;
243} __packed;
244
245#define L2CAP_MODE_BASIC 0x00
246#define L2CAP_MODE_RETRANS 0x01
247#define L2CAP_MODE_FLOWCTL 0x02
248#define L2CAP_MODE_ERTM 0x03
249#define L2CAP_MODE_STREAMING 0x04
250
251struct l2cap_disconn_req {
252 __le16 dcid;
253 __le16 scid;
254} __packed;
255
256struct l2cap_disconn_rsp {
257 __le16 dcid;
258 __le16 scid;
259} __packed;
260
261struct l2cap_info_req {
262 __le16 type;
263} __packed;
264
265struct l2cap_info_rsp {
266 __le16 type;
267 __le16 result;
268 __u8 data[0];
269} __packed;
270
271/* info type */
272#define L2CAP_IT_CL_MTU 0x0001
273#define L2CAP_IT_FEAT_MASK 0x0002
274#define L2CAP_IT_FIXED_CHAN 0x0003
275
276/* info result */
277#define L2CAP_IR_SUCCESS 0x0000
278#define L2CAP_IR_NOTSUPP 0x0001
279
280struct l2cap_conn_param_update_req {
281 __le16 min;
282 __le16 max;
283 __le16 latency;
284 __le16 to_multiplier;
285} __packed;
286
287struct l2cap_conn_param_update_rsp {
288 __le16 result;
289} __packed;
290
291/* Connection Parameters result */
292#define L2CAP_CONN_PARAM_ACCEPTED 0x0000
293#define L2CAP_CONN_PARAM_REJECTED 0x0001
294
295/* ----- L2CAP channels and connections ----- */
296struct srej_list {
297 __u8 tx_seq;
298 struct list_head list;
299};
300
301struct l2cap_chan {
302 struct sock *sk;
303
304 struct l2cap_conn *conn;
305
306 __u8 state;
307
308 atomic_t refcnt;
309
310 __le16 psm;
311 __u16 dcid;
312 __u16 scid;
313
314 __u16 imtu;
315 __u16 omtu;
316 __u16 flush_to;
317 __u8 mode;
318 __u8 chan_type;
319
320 __le16 sport;
321
322 __u8 sec_level;
323 __u8 role_switch;
324 __u8 force_reliable;
325 __u8 flushable;
326 __u8 force_active;
327
328 __u8 ident;
329
330 __u8 conf_req[64];
331 __u8 conf_len;
332 __u8 num_conf_req;
333 __u8 num_conf_rsp;
334
335 __u8 fcs;
336
337 __u8 tx_win;
338 __u8 max_tx;
339 __u16 retrans_timeout;
340 __u16 monitor_timeout;
341 __u16 mps;
342
343 unsigned long conf_state;
344 unsigned long conn_state;
345
346 __u8 next_tx_seq;
347 __u8 expected_ack_seq;
348 __u8 expected_tx_seq;
349 __u8 buffer_seq;
350 __u8 buffer_seq_srej;
351 __u8 srej_save_reqseq;
352 __u8 frames_sent;
353 __u8 unacked_frames;
354 __u8 retry_count;
355 __u8 num_acked;
356 __u16 sdu_len;
357 __u16 partial_sdu_len;
358 struct sk_buff *sdu;
359
360 __u8 remote_tx_win;
361 __u8 remote_max_tx;
362 __u16 remote_mps;
363
364 struct timer_list chan_timer;
365 struct timer_list retrans_timer;
366 struct timer_list monitor_timer;
367 struct timer_list ack_timer;
368 struct sk_buff *tx_send_head;
369 struct sk_buff_head tx_q;
370 struct sk_buff_head srej_q;
371 struct list_head srej_l;
372
373 struct list_head list;
374 struct list_head global_l;
375
376 void *data;
377 struct l2cap_ops *ops;
378};
379
380struct l2cap_ops {
381 char *name;
382
383 struct l2cap_chan *(*new_connection) (void *data);
384 int (*recv) (void *data, struct sk_buff *skb);
385 void (*close) (void *data);
386 void (*state_change) (void *data, int state);
387};
388
389struct l2cap_conn {
390 struct hci_conn *hcon;
391
392 bdaddr_t *dst;
393 bdaddr_t *src;
394
395 unsigned int mtu;
396
397 __u32 feat_mask;
398
399 __u8 info_state;
400 __u8 info_ident;
401
402 struct timer_list info_timer;
403
404 spinlock_t lock;
405
406 struct sk_buff *rx_skb;
407 __u32 rx_len;
408 __u8 tx_ident;
409
410 __u8 disc_reason;
411
412 __u8 preq[7]; /* SMP Pairing Request */
413 __u8 prsp[7]; /* SMP Pairing Response */
414 __u8 prnd[16]; /* SMP Pairing Random */
415 __u8 pcnf[16]; /* SMP Pairing Confirm */
416 __u8 tk[16]; /* SMP Temporary Key */
417 __u8 smp_key_size;
418
419 struct timer_list security_timer;
420
421 struct list_head chan_l;
422 rwlock_t chan_lock;
423};
424
425#define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
426#define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
427#define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
428
429#define L2CAP_CHAN_RAW 1
430#define L2CAP_CHAN_CONN_LESS 2
431#define L2CAP_CHAN_CONN_ORIENTED 3
432
433/* ----- L2CAP socket info ----- */
434#define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
435
436struct l2cap_pinfo {
437 struct bt_sock bt;
438 struct l2cap_chan *chan;
439 struct sk_buff *rx_busy_skb;
440};
441
442enum {
443 CONF_REQ_SENT,
444 CONF_INPUT_DONE,
445 CONF_OUTPUT_DONE,
446 CONF_MTU_DONE,
447 CONF_MODE_DONE,
448 CONF_CONNECT_PEND,
449 CONF_NO_FCS_RECV,
450 CONF_STATE2_DEVICE,
451};
452
453#define L2CAP_CONF_MAX_CONF_REQ 2
454#define L2CAP_CONF_MAX_CONF_RSP 2
455
456enum {
457 CONN_SAR_SDU,
458 CONN_SREJ_SENT,
459 CONN_WAIT_F,
460 CONN_SREJ_ACT,
461 CONN_SEND_PBIT,
462 CONN_REMOTE_BUSY,
463 CONN_LOCAL_BUSY,
464 CONN_REJ_ACT,
465 CONN_SEND_FBIT,
466 CONN_RNR_SENT,
467};
468
469#define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
470#define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
471#define __set_retrans_timer(c) l2cap_set_timer(c, &c->retrans_timer, \
472 L2CAP_DEFAULT_RETRANS_TO);
473#define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
474#define __set_monitor_timer(c) l2cap_set_timer(c, &c->monitor_timer, \
475 L2CAP_DEFAULT_MONITOR_TO);
476#define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
477#define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
478 L2CAP_DEFAULT_ACK_TO);
479#define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
480
481static inline int l2cap_tx_window_full(struct l2cap_chan *ch)
482{
483 int sub;
484
485 sub = (ch->next_tx_seq - ch->expected_ack_seq) % 64;
486
487 if (sub < 0)
488 sub += 64;
489
490 return sub == ch->remote_tx_win;
491}
492
493#define __get_txseq(ctrl) (((ctrl) & L2CAP_CTRL_TXSEQ) >> 1)
494#define __get_reqseq(ctrl) (((ctrl) & L2CAP_CTRL_REQSEQ) >> 8)
495#define __is_iframe(ctrl) (!((ctrl) & L2CAP_CTRL_FRAME_TYPE))
496#define __is_sframe(ctrl) ((ctrl) & L2CAP_CTRL_FRAME_TYPE)
497#define __is_sar_start(ctrl) (((ctrl) & L2CAP_CTRL_SAR) == L2CAP_SDU_START)
498
499extern int disable_ertm;
500
501int l2cap_init_sockets(void);
502void l2cap_cleanup_sockets(void);
503
504void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
505int __l2cap_wait_ack(struct sock *sk);
506
507int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
508int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid);
509
510struct l2cap_chan *l2cap_chan_create(struct sock *sk);
511void l2cap_chan_close(struct l2cap_chan *chan, int reason);
512void l2cap_chan_destroy(struct l2cap_chan *chan);
513int l2cap_chan_connect(struct l2cap_chan *chan);
514int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
515void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
516
517#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_HDR_SIZE 4
211#define L2CAP_ENH_HDR_SIZE 6
212#define L2CAP_EXT_HDR_SIZE 8
213
214#define L2CAP_FCS_SIZE 2
215#define L2CAP_SDULEN_SIZE 2
216#define L2CAP_PSMLEN_SIZE 2
217#define L2CAP_ENH_CTRL_SIZE 2
218#define L2CAP_EXT_CTRL_SIZE 4
219
220struct l2cap_cmd_hdr {
221 __u8 code;
222 __u8 ident;
223 __le16 len;
224} __packed;
225#define L2CAP_CMD_HDR_SIZE 4
226
227struct l2cap_cmd_rej_unk {
228 __le16 reason;
229} __packed;
230
231struct l2cap_cmd_rej_mtu {
232 __le16 reason;
233 __le16 max_mtu;
234} __packed;
235
236struct l2cap_cmd_rej_cid {
237 __le16 reason;
238 __le16 scid;
239 __le16 dcid;
240} __packed;
241
242struct l2cap_conn_req {
243 __le16 psm;
244 __le16 scid;
245} __packed;
246
247struct l2cap_conn_rsp {
248 __le16 dcid;
249 __le16 scid;
250 __le16 result;
251 __le16 status;
252} __packed;
253
254/* protocol/service multiplexer (PSM) */
255#define L2CAP_PSM_SDP 0x0001
256#define L2CAP_PSM_RFCOMM 0x0003
257#define L2CAP_PSM_3DSP 0x0021
258#define L2CAP_PSM_IPSP 0x0023 /* 6LoWPAN */
259
260#define L2CAP_PSM_DYN_START 0x1001
261#define L2CAP_PSM_DYN_END 0xffff
262#define L2CAP_PSM_AUTO_END 0x10ff
263#define L2CAP_PSM_LE_DYN_START 0x0080
264#define L2CAP_PSM_LE_DYN_END 0x00ff
265
266/* channel identifier */
267#define L2CAP_CID_SIGNALING 0x0001
268#define L2CAP_CID_CONN_LESS 0x0002
269#define L2CAP_CID_A2MP 0x0003
270#define L2CAP_CID_ATT 0x0004
271#define L2CAP_CID_LE_SIGNALING 0x0005
272#define L2CAP_CID_SMP 0x0006
273#define L2CAP_CID_SMP_BREDR 0x0007
274#define L2CAP_CID_DYN_START 0x0040
275#define L2CAP_CID_DYN_END 0xffff
276#define L2CAP_CID_LE_DYN_END 0x007f
277
278/* connect/create channel results */
279#define L2CAP_CR_SUCCESS 0x0000
280#define L2CAP_CR_PEND 0x0001
281#define L2CAP_CR_BAD_PSM 0x0002
282#define L2CAP_CR_SEC_BLOCK 0x0003
283#define L2CAP_CR_NO_MEM 0x0004
284#define L2CAP_CR_BAD_AMP 0x0005
285#define L2CAP_CR_INVALID_SCID 0x0006
286#define L2CAP_CR_SCID_IN_USE 0x0007
287
288/* credit based connect results */
289#define L2CAP_CR_LE_SUCCESS 0x0000
290#define L2CAP_CR_LE_BAD_PSM 0x0002
291#define L2CAP_CR_LE_NO_MEM 0x0004
292#define L2CAP_CR_LE_AUTHENTICATION 0x0005
293#define L2CAP_CR_LE_AUTHORIZATION 0x0006
294#define L2CAP_CR_LE_BAD_KEY_SIZE 0x0007
295#define L2CAP_CR_LE_ENCRYPTION 0x0008
296#define L2CAP_CR_LE_INVALID_SCID 0x0009
297#define L2CAP_CR_LE_SCID_IN_USE 0X000A
298#define L2CAP_CR_LE_UNACCEPT_PARAMS 0X000B
299#define L2CAP_CR_LE_INVALID_PARAMS 0X000C
300
301/* connect/create channel status */
302#define L2CAP_CS_NO_INFO 0x0000
303#define L2CAP_CS_AUTHEN_PEND 0x0001
304#define L2CAP_CS_AUTHOR_PEND 0x0002
305
306struct l2cap_conf_req {
307 __le16 dcid;
308 __le16 flags;
309 __u8 data[];
310} __packed;
311
312struct l2cap_conf_rsp {
313 __le16 scid;
314 __le16 flags;
315 __le16 result;
316 __u8 data[];
317} __packed;
318
319#define L2CAP_CONF_SUCCESS 0x0000
320#define L2CAP_CONF_UNACCEPT 0x0001
321#define L2CAP_CONF_REJECT 0x0002
322#define L2CAP_CONF_UNKNOWN 0x0003
323#define L2CAP_CONF_PENDING 0x0004
324#define L2CAP_CONF_EFS_REJECT 0x0005
325
326/* configuration req/rsp continuation flag */
327#define L2CAP_CONF_FLAG_CONTINUATION 0x0001
328
329struct l2cap_conf_opt {
330 __u8 type;
331 __u8 len;
332 __u8 val[];
333} __packed;
334#define L2CAP_CONF_OPT_SIZE 2
335
336#define L2CAP_CONF_HINT 0x80
337#define L2CAP_CONF_MASK 0x7f
338
339#define L2CAP_CONF_MTU 0x01
340#define L2CAP_CONF_FLUSH_TO 0x02
341#define L2CAP_CONF_QOS 0x03
342#define L2CAP_CONF_RFC 0x04
343#define L2CAP_CONF_FCS 0x05
344#define L2CAP_CONF_EFS 0x06
345#define L2CAP_CONF_EWS 0x07
346
347#define L2CAP_CONF_MAX_SIZE 22
348
349struct l2cap_conf_rfc {
350 __u8 mode;
351 __u8 txwin_size;
352 __u8 max_transmit;
353 __le16 retrans_timeout;
354 __le16 monitor_timeout;
355 __le16 max_pdu_size;
356} __packed;
357
358#define L2CAP_MODE_BASIC 0x00
359#define L2CAP_MODE_RETRANS 0x01
360#define L2CAP_MODE_FLOWCTL 0x02
361#define L2CAP_MODE_ERTM 0x03
362#define L2CAP_MODE_STREAMING 0x04
363
364/* Unlike the above this one doesn't actually map to anything that would
365 * ever be sent over the air. Therefore, use a value that's unlikely to
366 * ever be used in the BR/EDR configuration phase.
367 */
368#define L2CAP_MODE_LE_FLOWCTL 0x80
369#define L2CAP_MODE_EXT_FLOWCTL 0x81
370
371struct l2cap_conf_efs {
372 __u8 id;
373 __u8 stype;
374 __le16 msdu;
375 __le32 sdu_itime;
376 __le32 acc_lat;
377 __le32 flush_to;
378} __packed;
379
380#define L2CAP_SERV_NOTRAFIC 0x00
381#define L2CAP_SERV_BESTEFFORT 0x01
382#define L2CAP_SERV_GUARANTEED 0x02
383
384#define L2CAP_BESTEFFORT_ID 0x01
385
386struct l2cap_disconn_req {
387 __le16 dcid;
388 __le16 scid;
389} __packed;
390
391struct l2cap_disconn_rsp {
392 __le16 dcid;
393 __le16 scid;
394} __packed;
395
396struct l2cap_info_req {
397 __le16 type;
398} __packed;
399
400struct l2cap_info_rsp {
401 __le16 type;
402 __le16 result;
403 __u8 data[];
404} __packed;
405
406struct l2cap_create_chan_req {
407 __le16 psm;
408 __le16 scid;
409 __u8 amp_id;
410} __packed;
411
412struct l2cap_create_chan_rsp {
413 __le16 dcid;
414 __le16 scid;
415 __le16 result;
416 __le16 status;
417} __packed;
418
419struct l2cap_move_chan_req {
420 __le16 icid;
421 __u8 dest_amp_id;
422} __packed;
423
424struct l2cap_move_chan_rsp {
425 __le16 icid;
426 __le16 result;
427} __packed;
428
429#define L2CAP_MR_SUCCESS 0x0000
430#define L2CAP_MR_PEND 0x0001
431#define L2CAP_MR_BAD_ID 0x0002
432#define L2CAP_MR_SAME_ID 0x0003
433#define L2CAP_MR_NOT_SUPP 0x0004
434#define L2CAP_MR_COLLISION 0x0005
435#define L2CAP_MR_NOT_ALLOWED 0x0006
436
437struct l2cap_move_chan_cfm {
438 __le16 icid;
439 __le16 result;
440} __packed;
441
442#define L2CAP_MC_CONFIRMED 0x0000
443#define L2CAP_MC_UNCONFIRMED 0x0001
444
445struct l2cap_move_chan_cfm_rsp {
446 __le16 icid;
447} __packed;
448
449/* info type */
450#define L2CAP_IT_CL_MTU 0x0001
451#define L2CAP_IT_FEAT_MASK 0x0002
452#define L2CAP_IT_FIXED_CHAN 0x0003
453
454/* info result */
455#define L2CAP_IR_SUCCESS 0x0000
456#define L2CAP_IR_NOTSUPP 0x0001
457
458struct l2cap_conn_param_update_req {
459 __le16 min;
460 __le16 max;
461 __le16 latency;
462 __le16 to_multiplier;
463} __packed;
464
465struct l2cap_conn_param_update_rsp {
466 __le16 result;
467} __packed;
468
469/* Connection Parameters result */
470#define L2CAP_CONN_PARAM_ACCEPTED 0x0000
471#define L2CAP_CONN_PARAM_REJECTED 0x0001
472
473struct l2cap_le_conn_req {
474 __le16 psm;
475 __le16 scid;
476 __le16 mtu;
477 __le16 mps;
478 __le16 credits;
479} __packed;
480
481struct l2cap_le_conn_rsp {
482 __le16 dcid;
483 __le16 mtu;
484 __le16 mps;
485 __le16 credits;
486 __le16 result;
487} __packed;
488
489struct l2cap_le_credits {
490 __le16 cid;
491 __le16 credits;
492} __packed;
493
494#define L2CAP_ECRED_MIN_MTU 64
495#define L2CAP_ECRED_MIN_MPS 64
496
497struct l2cap_ecred_conn_req {
498 __le16 psm;
499 __le16 mtu;
500 __le16 mps;
501 __le16 credits;
502 __le16 scid[];
503} __packed;
504
505struct l2cap_ecred_conn_rsp {
506 __le16 mtu;
507 __le16 mps;
508 __le16 credits;
509 __le16 result;
510 __le16 dcid[];
511};
512
513struct l2cap_ecred_reconf_req {
514 __le16 mtu;
515 __le16 mps;
516 __le16 scid[];
517} __packed;
518
519#define L2CAP_RECONF_SUCCESS 0x0000
520#define L2CAP_RECONF_INVALID_MTU 0x0001
521#define L2CAP_RECONF_INVALID_MPS 0x0002
522
523struct l2cap_ecred_reconf_rsp {
524 __le16 result;
525} __packed;
526
527/* ----- L2CAP channels and connections ----- */
528struct l2cap_seq_list {
529 __u16 head;
530 __u16 tail;
531 __u16 mask;
532 __u16 *list;
533};
534
535#define L2CAP_SEQ_LIST_CLEAR 0xFFFF
536#define L2CAP_SEQ_LIST_TAIL 0x8000
537
538struct l2cap_chan {
539 struct l2cap_conn *conn;
540 struct hci_conn *hs_hcon;
541 struct hci_chan *hs_hchan;
542 struct kref kref;
543 atomic_t nesting;
544
545 __u8 state;
546
547 bdaddr_t dst;
548 __u8 dst_type;
549 bdaddr_t src;
550 __u8 src_type;
551 __le16 psm;
552 __le16 sport;
553 __u16 dcid;
554 __u16 scid;
555
556 __u16 imtu;
557 __u16 omtu;
558 __u16 flush_to;
559 __u8 mode;
560 __u8 chan_type;
561 __u8 chan_policy;
562
563 __u8 sec_level;
564
565 __u8 ident;
566
567 __u8 conf_req[64];
568 __u8 conf_len;
569 __u8 num_conf_req;
570 __u8 num_conf_rsp;
571
572 __u8 fcs;
573
574 __u16 tx_win;
575 __u16 tx_win_max;
576 __u16 ack_win;
577 __u8 max_tx;
578 __u16 retrans_timeout;
579 __u16 monitor_timeout;
580 __u16 mps;
581
582 __u16 tx_credits;
583 __u16 rx_credits;
584
585 __u8 tx_state;
586 __u8 rx_state;
587
588 unsigned long conf_state;
589 unsigned long conn_state;
590 unsigned long flags;
591
592 __u8 remote_amp_id;
593 __u8 local_amp_id;
594 __u8 move_id;
595 __u8 move_state;
596 __u8 move_role;
597
598 __u16 next_tx_seq;
599 __u16 expected_ack_seq;
600 __u16 expected_tx_seq;
601 __u16 buffer_seq;
602 __u16 srej_save_reqseq;
603 __u16 last_acked_seq;
604 __u16 frames_sent;
605 __u16 unacked_frames;
606 __u8 retry_count;
607 __u16 sdu_len;
608 struct sk_buff *sdu;
609 struct sk_buff *sdu_last_frag;
610
611 __u16 remote_tx_win;
612 __u8 remote_max_tx;
613 __u16 remote_mps;
614
615 __u8 local_id;
616 __u8 local_stype;
617 __u16 local_msdu;
618 __u32 local_sdu_itime;
619 __u32 local_acc_lat;
620 __u32 local_flush_to;
621
622 __u8 remote_id;
623 __u8 remote_stype;
624 __u16 remote_msdu;
625 __u32 remote_sdu_itime;
626 __u32 remote_acc_lat;
627 __u32 remote_flush_to;
628
629 struct delayed_work chan_timer;
630 struct delayed_work retrans_timer;
631 struct delayed_work monitor_timer;
632 struct delayed_work ack_timer;
633
634 struct sk_buff *tx_send_head;
635 struct sk_buff_head tx_q;
636 struct sk_buff_head srej_q;
637 struct l2cap_seq_list srej_list;
638 struct l2cap_seq_list retrans_list;
639
640 struct list_head list;
641 struct list_head global_l;
642
643 void *data;
644 const struct l2cap_ops *ops;
645 struct mutex lock;
646};
647
648struct l2cap_ops {
649 char *name;
650
651 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan);
652 int (*recv) (struct l2cap_chan * chan,
653 struct sk_buff *skb);
654 void (*teardown) (struct l2cap_chan *chan, int err);
655 void (*close) (struct l2cap_chan *chan);
656 void (*state_change) (struct l2cap_chan *chan,
657 int state, int err);
658 void (*ready) (struct l2cap_chan *chan);
659 void (*defer) (struct l2cap_chan *chan);
660 void (*resume) (struct l2cap_chan *chan);
661 void (*suspend) (struct l2cap_chan *chan);
662 void (*set_shutdown) (struct l2cap_chan *chan);
663 long (*get_sndtimeo) (struct l2cap_chan *chan);
664 struct pid *(*get_peer_pid) (struct l2cap_chan *chan);
665 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan,
666 unsigned long hdr_len,
667 unsigned long len, int nb);
668};
669
670struct l2cap_conn {
671 struct hci_conn *hcon;
672 struct hci_chan *hchan;
673
674 unsigned int mtu;
675
676 __u32 feat_mask;
677 __u8 remote_fixed_chan;
678 __u8 local_fixed_chan;
679
680 __u8 info_state;
681 __u8 info_ident;
682
683 struct delayed_work info_timer;
684
685 struct sk_buff *rx_skb;
686 __u32 rx_len;
687 __u8 tx_ident;
688 struct mutex ident_lock;
689
690 struct sk_buff_head pending_rx;
691 struct work_struct pending_rx_work;
692
693 struct work_struct id_addr_update_work;
694
695 __u8 disc_reason;
696
697 struct l2cap_chan *smp;
698
699 struct list_head chan_l;
700 struct mutex chan_lock;
701 struct kref ref;
702 struct list_head users;
703};
704
705struct l2cap_user {
706 struct list_head list;
707 int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
708 void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
709};
710
711#define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
712#define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
713#define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
714
715#define L2CAP_CHAN_RAW 1
716#define L2CAP_CHAN_CONN_LESS 2
717#define L2CAP_CHAN_CONN_ORIENTED 3
718#define L2CAP_CHAN_FIXED 4
719
720/* ----- L2CAP socket info ----- */
721#define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
722
723struct l2cap_pinfo {
724 struct bt_sock bt;
725 struct l2cap_chan *chan;
726 struct sk_buff *rx_busy_skb;
727};
728
729enum {
730 CONF_REQ_SENT,
731 CONF_INPUT_DONE,
732 CONF_OUTPUT_DONE,
733 CONF_MTU_DONE,
734 CONF_MODE_DONE,
735 CONF_CONNECT_PEND,
736 CONF_RECV_NO_FCS,
737 CONF_STATE2_DEVICE,
738 CONF_EWS_RECV,
739 CONF_LOC_CONF_PEND,
740 CONF_REM_CONF_PEND,
741 CONF_NOT_COMPLETE,
742};
743
744#define L2CAP_CONF_MAX_CONF_REQ 2
745#define L2CAP_CONF_MAX_CONF_RSP 2
746
747enum {
748 CONN_SREJ_SENT,
749 CONN_WAIT_F,
750 CONN_SREJ_ACT,
751 CONN_SEND_PBIT,
752 CONN_REMOTE_BUSY,
753 CONN_LOCAL_BUSY,
754 CONN_REJ_ACT,
755 CONN_SEND_FBIT,
756 CONN_RNR_SENT,
757};
758
759/* Definitions for flags in l2cap_chan */
760enum {
761 FLAG_ROLE_SWITCH,
762 FLAG_FORCE_ACTIVE,
763 FLAG_FORCE_RELIABLE,
764 FLAG_FLUSHABLE,
765 FLAG_EXT_CTRL,
766 FLAG_EFS_ENABLE,
767 FLAG_DEFER_SETUP,
768 FLAG_LE_CONN_REQ_SENT,
769 FLAG_ECRED_CONN_REQ_SENT,
770 FLAG_PENDING_SECURITY,
771 FLAG_HOLD_HCI_CONN,
772};
773
774/* Lock nesting levels for L2CAP channels. We need these because lockdep
775 * otherwise considers all channels equal and will e.g. complain about a
776 * connection oriented channel triggering SMP procedures or a listening
777 * channel creating and locking a child channel.
778 */
779enum {
780 L2CAP_NESTING_SMP,
781 L2CAP_NESTING_NORMAL,
782 L2CAP_NESTING_PARENT,
783};
784
785enum {
786 L2CAP_TX_STATE_XMIT,
787 L2CAP_TX_STATE_WAIT_F,
788};
789
790enum {
791 L2CAP_RX_STATE_RECV,
792 L2CAP_RX_STATE_SREJ_SENT,
793 L2CAP_RX_STATE_MOVE,
794 L2CAP_RX_STATE_WAIT_P,
795 L2CAP_RX_STATE_WAIT_F,
796};
797
798enum {
799 L2CAP_TXSEQ_EXPECTED,
800 L2CAP_TXSEQ_EXPECTED_SREJ,
801 L2CAP_TXSEQ_UNEXPECTED,
802 L2CAP_TXSEQ_UNEXPECTED_SREJ,
803 L2CAP_TXSEQ_DUPLICATE,
804 L2CAP_TXSEQ_DUPLICATE_SREJ,
805 L2CAP_TXSEQ_INVALID,
806 L2CAP_TXSEQ_INVALID_IGNORE,
807};
808
809enum {
810 L2CAP_EV_DATA_REQUEST,
811 L2CAP_EV_LOCAL_BUSY_DETECTED,
812 L2CAP_EV_LOCAL_BUSY_CLEAR,
813 L2CAP_EV_RECV_REQSEQ_AND_FBIT,
814 L2CAP_EV_RECV_FBIT,
815 L2CAP_EV_RETRANS_TO,
816 L2CAP_EV_MONITOR_TO,
817 L2CAP_EV_EXPLICIT_POLL,
818 L2CAP_EV_RECV_IFRAME,
819 L2CAP_EV_RECV_RR,
820 L2CAP_EV_RECV_REJ,
821 L2CAP_EV_RECV_RNR,
822 L2CAP_EV_RECV_SREJ,
823 L2CAP_EV_RECV_FRAME,
824};
825
826enum {
827 L2CAP_MOVE_ROLE_NONE,
828 L2CAP_MOVE_ROLE_INITIATOR,
829 L2CAP_MOVE_ROLE_RESPONDER,
830};
831
832enum {
833 L2CAP_MOVE_STABLE,
834 L2CAP_MOVE_WAIT_REQ,
835 L2CAP_MOVE_WAIT_RSP,
836 L2CAP_MOVE_WAIT_RSP_SUCCESS,
837 L2CAP_MOVE_WAIT_CONFIRM,
838 L2CAP_MOVE_WAIT_CONFIRM_RSP,
839 L2CAP_MOVE_WAIT_LOGICAL_COMP,
840 L2CAP_MOVE_WAIT_LOGICAL_CFM,
841 L2CAP_MOVE_WAIT_LOCAL_BUSY,
842 L2CAP_MOVE_WAIT_PREPARE,
843};
844
845void l2cap_chan_hold(struct l2cap_chan *c);
846void l2cap_chan_put(struct l2cap_chan *c);
847
848static inline void l2cap_chan_lock(struct l2cap_chan *chan)
849{
850 mutex_lock_nested(&chan->lock, atomic_read(&chan->nesting));
851}
852
853static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
854{
855 mutex_unlock(&chan->lock);
856}
857
858static inline void l2cap_set_timer(struct l2cap_chan *chan,
859 struct delayed_work *work, long timeout)
860{
861 BT_DBG("chan %p state %s timeout %ld", chan,
862 state_to_string(chan->state), timeout);
863
864 /* If delayed work cancelled do not hold(chan)
865 since it is already done with previous set_timer */
866 if (!cancel_delayed_work(work))
867 l2cap_chan_hold(chan);
868
869 schedule_delayed_work(work, timeout);
870}
871
872static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
873 struct delayed_work *work)
874{
875 bool ret;
876
877 /* put(chan) if delayed work cancelled otherwise it
878 is done in delayed work function */
879 ret = cancel_delayed_work(work);
880 if (ret)
881 l2cap_chan_put(chan);
882
883 return ret;
884}
885
886#define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
887#define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
888#define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
889#define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
890#define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
891 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
892#define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
893
894static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
895{
896 if (seq1 >= seq2)
897 return seq1 - seq2;
898 else
899 return chan->tx_win_max + 1 - seq2 + seq1;
900}
901
902static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
903{
904 return (seq + 1) % (chan->tx_win_max + 1);
905}
906
907static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
908{
909 return NULL;
910}
911
912static inline int l2cap_chan_no_recv(struct l2cap_chan *chan, struct sk_buff *skb)
913{
914 return -ENOSYS;
915}
916
917static inline struct sk_buff *l2cap_chan_no_alloc_skb(struct l2cap_chan *chan,
918 unsigned long hdr_len,
919 unsigned long len, int nb)
920{
921 return ERR_PTR(-ENOSYS);
922}
923
924static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
925{
926}
927
928static inline void l2cap_chan_no_close(struct l2cap_chan *chan)
929{
930}
931
932static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
933{
934}
935
936static inline void l2cap_chan_no_state_change(struct l2cap_chan *chan,
937 int state, int err)
938{
939}
940
941static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
942{
943}
944
945static inline void l2cap_chan_no_suspend(struct l2cap_chan *chan)
946{
947}
948
949static inline void l2cap_chan_no_resume(struct l2cap_chan *chan)
950{
951}
952
953static inline void l2cap_chan_no_set_shutdown(struct l2cap_chan *chan)
954{
955}
956
957static inline long l2cap_chan_no_get_sndtimeo(struct l2cap_chan *chan)
958{
959 return 0;
960}
961
962extern bool disable_ertm;
963extern bool enable_ecred;
964
965int l2cap_init_sockets(void);
966void l2cap_cleanup_sockets(void);
967bool l2cap_is_socket(struct socket *sock);
968
969void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan);
970void __l2cap_ecred_conn_rsp_defer(struct l2cap_chan *chan);
971void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
972
973int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
974int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid);
975
976struct l2cap_chan *l2cap_chan_create(void);
977void l2cap_chan_close(struct l2cap_chan *chan, int reason);
978int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
979 bdaddr_t *dst, u8 dst_type);
980int l2cap_chan_reconfigure(struct l2cap_chan *chan, __u16 mtu);
981int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len);
982void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
983int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator);
984void l2cap_chan_set_defaults(struct l2cap_chan *chan);
985int l2cap_ertm_init(struct l2cap_chan *chan);
986void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
987void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
988typedef void (*l2cap_chan_func_t)(struct l2cap_chan *chan, void *data);
989void l2cap_chan_list(struct l2cap_conn *conn, l2cap_chan_func_t func,
990 void *data);
991void l2cap_chan_del(struct l2cap_chan *chan, int err);
992void l2cap_send_conn_req(struct l2cap_chan *chan);
993void l2cap_move_start(struct l2cap_chan *chan);
994void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
995 u8 status);
996void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
997
998struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn);
999void l2cap_conn_put(struct l2cap_conn *conn);
1000
1001int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
1002void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
1003
1004#endif /* __L2CAP_H */