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_LOCAL_BUSY_TRIES 12
41 #define L2CAP_LE_DEFAULT_MTU 23
42
43 #define L2CAP_CONN_TIMEOUT (40000) /* 40 seconds */
44 #define L2CAP_INFO_TIMEOUT (4000) /* 4 seconds */
45
46 /* L2CAP socket address */
47 struct sockaddr_l2 {
48 sa_family_t l2_family;
49 __le16 l2_psm;
50 bdaddr_t l2_bdaddr;
51 __le16 l2_cid;
52 };
53
54 /* L2CAP socket options */
55 #define L2CAP_OPTIONS 0x01
56 struct l2cap_options {
57 __u16 omtu;
58 __u16 imtu;
59 __u16 flush_to;
60 __u8 mode;
61 __u8 fcs;
62 __u8 max_tx;
63 __u16 txwin_size;
64 };
65
66 #define L2CAP_CONNINFO 0x02
67 struct l2cap_conninfo {
68 __u16 hci_handle;
69 __u8 dev_class[3];
70 };
71
72 #define L2CAP_LM 0x03
73 #define L2CAP_LM_MASTER 0x0001
74 #define L2CAP_LM_AUTH 0x0002
75 #define L2CAP_LM_ENCRYPT 0x0004
76 #define L2CAP_LM_TRUSTED 0x0008
77 #define L2CAP_LM_RELIABLE 0x0010
78 #define L2CAP_LM_SECURE 0x0020
79
80 /* L2CAP command codes */
81 #define L2CAP_COMMAND_REJ 0x01
82 #define L2CAP_CONN_REQ 0x02
83 #define L2CAP_CONN_RSP 0x03
84 #define L2CAP_CONF_REQ 0x04
85 #define L2CAP_CONF_RSP 0x05
86 #define L2CAP_DISCONN_REQ 0x06
87 #define L2CAP_DISCONN_RSP 0x07
88 #define L2CAP_ECHO_REQ 0x08
89 #define L2CAP_ECHO_RSP 0x09
90 #define L2CAP_INFO_REQ 0x0a
91 #define L2CAP_INFO_RSP 0x0b
92 #define L2CAP_CONN_PARAM_UPDATE_REQ 0x12
93 #define L2CAP_CONN_PARAM_UPDATE_RSP 0x13
94
95 /* L2CAP feature mask */
96 #define L2CAP_FEAT_FLOWCTL 0x00000001
97 #define L2CAP_FEAT_RETRANS 0x00000002
98 #define L2CAP_FEAT_ERTM 0x00000008
99 #define L2CAP_FEAT_STREAMING 0x00000010
100 #define L2CAP_FEAT_FCS 0x00000020
101 #define L2CAP_FEAT_FIXED_CHAN 0x00000080
102
103 /* L2CAP checksum option */
104 #define L2CAP_FCS_NONE 0x00
105 #define L2CAP_FCS_CRC16 0x01
106
107 /* L2CAP Control Field bit masks */
108 #define L2CAP_CTRL_SAR 0xC000
109 #define L2CAP_CTRL_REQSEQ 0x3F00
110 #define L2CAP_CTRL_TXSEQ 0x007E
111 #define L2CAP_CTRL_RETRANS 0x0080
112 #define L2CAP_CTRL_FINAL 0x0080
113 #define L2CAP_CTRL_POLL 0x0010
114 #define L2CAP_CTRL_SUPERVISE 0x000C
115 #define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */
116
117 #define L2CAP_CTRL_TXSEQ_SHIFT 1
118 #define L2CAP_CTRL_REQSEQ_SHIFT 8
119 #define L2CAP_CTRL_SAR_SHIFT 14
120
121 /* L2CAP Supervisory Function */
122 #define L2CAP_SUPER_RCV_READY 0x0000
123 #define L2CAP_SUPER_REJECT 0x0004
124 #define L2CAP_SUPER_RCV_NOT_READY 0x0008
125 #define L2CAP_SUPER_SELECT_REJECT 0x000C
126
127 /* L2CAP Segmentation and Reassembly */
128 #define L2CAP_SDU_UNSEGMENTED 0x0000
129 #define L2CAP_SDU_START 0x4000
130 #define L2CAP_SDU_END 0x8000
131 #define L2CAP_SDU_CONTINUE 0xC000
132
133 /* L2CAP structures */
134 struct l2cap_hdr {
135 __le16 len;
136 __le16 cid;
137 } __packed;
138 #define L2CAP_HDR_SIZE 4
139
140 struct l2cap_cmd_hdr {
141 __u8 code;
142 __u8 ident;
143 __le16 len;
144 } __packed;
145 #define L2CAP_CMD_HDR_SIZE 4
146
147 struct l2cap_cmd_rej {
148 __le16 reason;
149 } __packed;
150
151 struct l2cap_conn_req {
152 __le16 psm;
153 __le16 scid;
154 } __packed;
155
156 struct l2cap_conn_rsp {
157 __le16 dcid;
158 __le16 scid;
159 __le16 result;
160 __le16 status;
161 } __packed;
162
163 /* channel indentifier */
164 #define L2CAP_CID_SIGNALING 0x0001
165 #define L2CAP_CID_CONN_LESS 0x0002
166 #define L2CAP_CID_LE_DATA 0x0004
167 #define L2CAP_CID_LE_SIGNALING 0x0005
168 #define L2CAP_CID_SMP 0x0006
169 #define L2CAP_CID_DYN_START 0x0040
170 #define L2CAP_CID_DYN_END 0xffff
171
172 /* connect result */
173 #define L2CAP_CR_SUCCESS 0x0000
174 #define L2CAP_CR_PEND 0x0001
175 #define L2CAP_CR_BAD_PSM 0x0002
176 #define L2CAP_CR_SEC_BLOCK 0x0003
177 #define L2CAP_CR_NO_MEM 0x0004
178
179 /* connect status */
180 #define L2CAP_CS_NO_INFO 0x0000
181 #define L2CAP_CS_AUTHEN_PEND 0x0001
182 #define L2CAP_CS_AUTHOR_PEND 0x0002
183
184 struct l2cap_conf_req {
185 __le16 dcid;
186 __le16 flags;
187 __u8 data[0];
188 } __packed;
189
190 struct l2cap_conf_rsp {
191 __le16 scid;
192 __le16 flags;
193 __le16 result;
194 __u8 data[0];
195 } __packed;
196
197 #define L2CAP_CONF_SUCCESS 0x0000
198 #define L2CAP_CONF_UNACCEPT 0x0001
199 #define L2CAP_CONF_REJECT 0x0002
200 #define L2CAP_CONF_UNKNOWN 0x0003
201
202 struct l2cap_conf_opt {
203 __u8 type;
204 __u8 len;
205 __u8 val[0];
206 } __packed;
207 #define L2CAP_CONF_OPT_SIZE 2
208
209 #define L2CAP_CONF_HINT 0x80
210 #define L2CAP_CONF_MASK 0x7f
211
212 #define L2CAP_CONF_MTU 0x01
213 #define L2CAP_CONF_FLUSH_TO 0x02
214 #define L2CAP_CONF_QOS 0x03
215 #define L2CAP_CONF_RFC 0x04
216 #define L2CAP_CONF_FCS 0x05
217
218 #define L2CAP_CONF_MAX_SIZE 22
219
220 struct l2cap_conf_rfc {
221 __u8 mode;
222 __u8 txwin_size;
223 __u8 max_transmit;
224 __le16 retrans_timeout;
225 __le16 monitor_timeout;
226 __le16 max_pdu_size;
227 } __packed;
228
229 #define L2CAP_MODE_BASIC 0x00
230 #define L2CAP_MODE_RETRANS 0x01
231 #define L2CAP_MODE_FLOWCTL 0x02
232 #define L2CAP_MODE_ERTM 0x03
233 #define L2CAP_MODE_STREAMING 0x04
234
235 struct l2cap_disconn_req {
236 __le16 dcid;
237 __le16 scid;
238 } __packed;
239
240 struct l2cap_disconn_rsp {
241 __le16 dcid;
242 __le16 scid;
243 } __packed;
244
245 struct l2cap_info_req {
246 __le16 type;
247 } __packed;
248
249 struct l2cap_info_rsp {
250 __le16 type;
251 __le16 result;
252 __u8 data[0];
253 } __packed;
254
255 /* info type */
256 #define L2CAP_IT_CL_MTU 0x0001
257 #define L2CAP_IT_FEAT_MASK 0x0002
258 #define L2CAP_IT_FIXED_CHAN 0x0003
259
260 /* info result */
261 #define L2CAP_IR_SUCCESS 0x0000
262 #define L2CAP_IR_NOTSUPP 0x0001
263
264 struct l2cap_conn_param_update_req {
265 __le16 min;
266 __le16 max;
267 __le16 latency;
268 __le16 to_multiplier;
269 } __packed;
270
271 struct l2cap_conn_param_update_rsp {
272 __le16 result;
273 } __packed;
274
275 /* Connection Parameters result */
276 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000
277 #define L2CAP_CONN_PARAM_REJECTED 0x0001
278
279 /* ----- L2CAP connections ----- */
280 struct l2cap_chan_list {
281 struct sock *head;
282 rwlock_t lock;
283 long num;
284 };
285
286 struct l2cap_conn {
287 struct hci_conn *hcon;
288
289 bdaddr_t *dst;
290 bdaddr_t *src;
291
292 unsigned int mtu;
293
294 __u32 feat_mask;
295
296 __u8 info_state;
297 __u8 info_ident;
298
299 struct timer_list info_timer;
300
301 spinlock_t lock;
302
303 struct sk_buff *rx_skb;
304 __u32 rx_len;
305 __u8 rx_ident;
306 __u8 tx_ident;
307
308 __u8 disc_reason;
309
310 struct l2cap_chan_list chan_list;
311 };
312
313 struct sock_del_list {
314 struct sock *sk;
315 struct list_head list;
316 };
317
318 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
319 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
320 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
321
322 /* ----- L2CAP channel and socket info ----- */
323 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
324 #define TX_QUEUE(sk) (&l2cap_pi(sk)->tx_queue)
325 #define SREJ_QUEUE(sk) (&l2cap_pi(sk)->srej_queue)
326 #define BUSY_QUEUE(sk) (&l2cap_pi(sk)->busy_queue)
327 #define SREJ_LIST(sk) (&l2cap_pi(sk)->srej_l.list)
328
329 struct srej_list {
330 __u8 tx_seq;
331 struct list_head list;
332 };
333
334 struct l2cap_pinfo {
335 struct bt_sock bt;
336 __le16 psm;
337 __u16 dcid;
338 __u16 scid;
339
340 __u16 imtu;
341 __u16 omtu;
342 __u16 flush_to;
343 __u8 mode;
344 __u8 num_conf_req;
345 __u8 num_conf_rsp;
346
347 __u8 fcs;
348 __u8 sec_level;
349 __u8 role_switch;
350 __u8 force_reliable;
351 __u8 flushable;
352
353 __u8 conf_req[64];
354 __u8 conf_len;
355 __u8 conf_state;
356 __u16 conn_state;
357
358 __u8 next_tx_seq;
359 __u8 expected_ack_seq;
360 __u8 expected_tx_seq;
361 __u8 buffer_seq;
362 __u8 buffer_seq_srej;
363 __u8 srej_save_reqseq;
364 __u8 frames_sent;
365 __u8 unacked_frames;
366 __u8 retry_count;
367 __u8 num_acked;
368 __u16 sdu_len;
369 __u16 partial_sdu_len;
370 struct sk_buff *sdu;
371
372 __u8 ident;
373
374 __u8 tx_win;
375 __u8 max_tx;
376 __u8 remote_tx_win;
377 __u8 remote_max_tx;
378 __u16 retrans_timeout;
379 __u16 monitor_timeout;
380 __u16 remote_mps;
381 __u16 mps;
382
383 __le16 sport;
384
385 struct timer_list retrans_timer;
386 struct timer_list monitor_timer;
387 struct timer_list ack_timer;
388 struct sk_buff_head tx_queue;
389 struct sk_buff_head srej_queue;
390 struct sk_buff_head busy_queue;
391 struct work_struct busy_work;
392 struct srej_list srej_l;
393 struct l2cap_conn *conn;
394 struct sock *next_c;
395 struct sock *prev_c;
396 };
397
398 #define L2CAP_CONF_REQ_SENT 0x01
399 #define L2CAP_CONF_INPUT_DONE 0x02
400 #define L2CAP_CONF_OUTPUT_DONE 0x04
401 #define L2CAP_CONF_MTU_DONE 0x08
402 #define L2CAP_CONF_MODE_DONE 0x10
403 #define L2CAP_CONF_CONNECT_PEND 0x20
404 #define L2CAP_CONF_NO_FCS_RECV 0x40
405 #define L2CAP_CONF_STATE2_DEVICE 0x80
406
407 #define L2CAP_CONF_MAX_CONF_REQ 2
408 #define L2CAP_CONF_MAX_CONF_RSP 2
409
410 #define L2CAP_CONN_SAR_SDU 0x0001
411 #define L2CAP_CONN_SREJ_SENT 0x0002
412 #define L2CAP_CONN_WAIT_F 0x0004
413 #define L2CAP_CONN_SREJ_ACT 0x0008
414 #define L2CAP_CONN_SEND_PBIT 0x0010
415 #define L2CAP_CONN_REMOTE_BUSY 0x0020
416 #define L2CAP_CONN_LOCAL_BUSY 0x0040
417 #define L2CAP_CONN_REJ_ACT 0x0080
418 #define L2CAP_CONN_SEND_FBIT 0x0100
419 #define L2CAP_CONN_RNR_SENT 0x0200
420 #define L2CAP_CONN_SAR_RETRY 0x0400
421
422 #define __mod_retrans_timer() mod_timer(&l2cap_pi(sk)->retrans_timer, \
423 jiffies + msecs_to_jiffies(L2CAP_DEFAULT_RETRANS_TO));
424 #define __mod_monitor_timer() mod_timer(&l2cap_pi(sk)->monitor_timer, \
425 jiffies + msecs_to_jiffies(L2CAP_DEFAULT_MONITOR_TO));
426 #define __mod_ack_timer() mod_timer(&l2cap_pi(sk)->ack_timer, \
427 jiffies + msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
428
l2cap_tx_window_full(struct sock * sk)429 static inline int l2cap_tx_window_full(struct sock *sk)
430 {
431 struct l2cap_pinfo *pi = l2cap_pi(sk);
432 int sub;
433
434 sub = (pi->next_tx_seq - pi->expected_ack_seq) % 64;
435
436 if (sub < 0)
437 sub += 64;
438
439 return sub == pi->remote_tx_win;
440 }
441
442 #define __get_txseq(ctrl) (((ctrl) & L2CAP_CTRL_TXSEQ) >> 1)
443 #define __get_reqseq(ctrl) (((ctrl) & L2CAP_CTRL_REQSEQ) >> 8)
444 #define __is_iframe(ctrl) (!((ctrl) & L2CAP_CTRL_FRAME_TYPE))
445 #define __is_sframe(ctrl) ((ctrl) & L2CAP_CTRL_FRAME_TYPE)
446 #define __is_sar_start(ctrl) (((ctrl) & L2CAP_CTRL_SAR) == L2CAP_SDU_START)
447
448 extern int disable_ertm;
449 extern const struct proto_ops l2cap_sock_ops;
450 extern struct bt_sock_list l2cap_sk_list;
451
452 int l2cap_init_sockets(void);
453 void l2cap_cleanup_sockets(void);
454
455 u8 l2cap_get_ident(struct l2cap_conn *conn);
456 void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data);
457 int l2cap_build_conf_req(struct sock *sk, void *data);
458 int __l2cap_wait_ack(struct sock *sk);
459
460 struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len);
461 struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len);
462 struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen);
463 int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len);
464 void l2cap_do_send(struct sock *sk, struct sk_buff *skb);
465 void l2cap_streaming_send(struct sock *sk);
466 int l2cap_ertm_send(struct sock *sk);
467
468 void l2cap_sock_set_timer(struct sock *sk, long timeout);
469 void l2cap_sock_clear_timer(struct sock *sk);
470 void __l2cap_sock_close(struct sock *sk, int reason);
471 void l2cap_sock_kill(struct sock *sk);
472 void l2cap_sock_init(struct sock *sk, struct sock *parent);
473 struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
474 int proto, gfp_t prio);
475 void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err);
476 void l2cap_chan_del(struct sock *sk, int err);
477 int l2cap_do_connect(struct sock *sk);
478
479 #endif /* __L2CAP_H */
480