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.
7 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
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;
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.
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.
30 #include <asm/unaligned.h>
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
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)
55 #define L2CAP_A2MP_DEFAULT_MTU 670
57 /* L2CAP socket address */
59 sa_family_t l2_family;
66 /* L2CAP socket options */
67 #define L2CAP_OPTIONS 0x01
68 struct l2cap_options {
78 #define L2CAP_CONNINFO 0x02
79 struct l2cap_conninfo {
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
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
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
125 /* L2CAP checksum option */
126 #define L2CAP_FCS_NONE 0x00
127 #define L2CAP_FCS_CRC16 0x01
129 /* L2CAP fixed channels */
130 #define L2CAP_FC_L2CAP 0x02
131 #define L2CAP_FC_A2MP 0x08
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
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 */
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
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
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 */
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
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
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
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
185 /* L2CAP structures */
190 #define L2CAP_HDR_SIZE 4
191 #define L2CAP_ENH_HDR_SIZE 6
192 #define L2CAP_EXT_HDR_SIZE 8
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
200 struct l2cap_cmd_hdr {
205 #define L2CAP_CMD_HDR_SIZE 4
207 struct l2cap_cmd_rej_unk {
211 struct l2cap_cmd_rej_mtu {
216 struct l2cap_cmd_rej_cid {
222 struct l2cap_conn_req {
227 struct l2cap_conn_rsp {
234 /* protocol/service multiplexer (PSM) */
235 #define L2CAP_PSM_SDP 0x0001
236 #define L2CAP_PSM_RFCOMM 0x0003
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
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
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
261 struct l2cap_conf_req {
267 struct l2cap_conf_rsp {
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
281 /* configuration req/rsp continuation flag */
282 #define L2CAP_CONF_FLAG_CONTINUATION 0x0001
284 struct l2cap_conf_opt {
289 #define L2CAP_CONF_OPT_SIZE 2
291 #define L2CAP_CONF_HINT 0x80
292 #define L2CAP_CONF_MASK 0x7f
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
302 #define L2CAP_CONF_MAX_SIZE 22
304 struct l2cap_conf_rfc {
308 __le16 retrans_timeout;
309 __le16 monitor_timeout;
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
319 struct l2cap_conf_efs {
328 #define L2CAP_SERV_NOTRAFIC 0x00
329 #define L2CAP_SERV_BESTEFFORT 0x01
330 #define L2CAP_SERV_GUARANTEED 0x02
332 #define L2CAP_BESTEFFORT_ID 0x01
334 struct l2cap_disconn_req {
339 struct l2cap_disconn_rsp {
344 struct l2cap_info_req {
348 struct l2cap_info_rsp {
354 struct l2cap_create_chan_req {
360 struct l2cap_create_chan_rsp {
367 struct l2cap_move_chan_req {
372 struct l2cap_move_chan_rsp {
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
385 struct l2cap_move_chan_cfm {
390 #define L2CAP_MC_CONFIRMED 0x0000
391 #define L2CAP_MC_UNCONFIRMED 0x0001
393 struct l2cap_move_chan_cfm_rsp {
398 #define L2CAP_IT_CL_MTU 0x0001
399 #define L2CAP_IT_FEAT_MASK 0x0002
400 #define L2CAP_IT_FIXED_CHAN 0x0003
403 #define L2CAP_IR_SUCCESS 0x0000
404 #define L2CAP_IR_NOTSUPP 0x0001
406 struct l2cap_conn_param_update_req {
410 __le16 to_multiplier;
413 struct l2cap_conn_param_update_rsp {
417 /* Connection Parameters result */
418 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000
419 #define L2CAP_CONN_PARAM_REJECTED 0x0001
421 /* ----- L2CAP channels and connections ----- */
422 struct l2cap_seq_list {
429 #define L2CAP_SEQ_LIST_CLEAR 0xFFFF
430 #define L2CAP_SEQ_LIST_TAIL 0x8000
435 struct l2cap_conn *conn;
468 __u16 retrans_timeout;
469 __u16 monitor_timeout;
475 unsigned long conf_state;
476 unsigned long conn_state;
480 __u16 expected_ack_seq;
481 __u16 expected_tx_seq;
483 __u16 srej_save_reqseq;
484 __u16 last_acked_seq;
486 __u16 unacked_frames;
488 __u16 srej_queue_next;
491 struct sk_buff *sdu_last_frag;
500 __u32 local_sdu_itime;
502 __u32 local_flush_to;
507 __u32 remote_sdu_itime;
508 __u32 remote_acc_lat;
509 __u32 remote_flush_to;
511 struct delayed_work chan_timer;
512 struct delayed_work retrans_timer;
513 struct delayed_work monitor_timer;
514 struct delayed_work ack_timer;
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;
522 struct list_head list;
523 struct list_head global_l;
526 struct l2cap_ops *ops;
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,
540 void (*ready) (struct l2cap_chan *chan);
541 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan,
542 unsigned long len, int nb);
546 struct hci_conn *hcon;
547 struct hci_chan *hchan;
555 __u8 fixed_chan_mask;
560 struct delayed_work info_timer;
564 struct sk_buff *rx_skb;
570 struct delayed_work security_timer;
571 struct smp_chan *smp_chan;
573 struct list_head chan_l;
574 struct mutex chan_lock;
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
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
586 /* ----- L2CAP socket info ----- */
587 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
591 struct l2cap_chan *chan;
592 struct sk_buff *rx_busy_skb;
610 #define L2CAP_CONF_MAX_CONF_REQ 2
611 #define L2CAP_CONF_MAX_CONF_RSP 2
625 /* Definitions for flags in l2cap_chan */
637 L2CAP_TX_STATE_WAIT_F,
642 L2CAP_RX_STATE_SREJ_SENT,
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,
653 L2CAP_TXSEQ_INVALID_IGNORE,
657 L2CAP_EV_DATA_REQUEST,
658 L2CAP_EV_LOCAL_BUSY_DETECTED,
659 L2CAP_EV_LOCAL_BUSY_CLEAR,
660 L2CAP_EV_RECV_REQSEQ_AND_FBIT,
664 L2CAP_EV_EXPLICIT_POLL,
665 L2CAP_EV_RECV_IFRAME,
673 void l2cap_chan_hold(struct l2cap_chan *c);
674 void l2cap_chan_put(struct l2cap_chan *c);
676 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
678 mutex_lock(&chan->lock);
681 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
683 mutex_unlock(&chan->lock);
686 static inline void l2cap_set_timer(struct l2cap_chan *chan,
687 struct delayed_work *work, long timeout)
689 BT_DBG("chan %p state %s timeout %ld", chan,
690 state_to_string(chan->state), timeout);
692 /* If delayed work cancelled do not hold(chan)
693 since it is already done with previous set_timer */
694 if (!cancel_delayed_work(work))
695 l2cap_chan_hold(chan);
697 schedule_delayed_work(work, timeout);
700 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
701 struct delayed_work *work)
705 /* put(chan) if delayed work cancelled otherwise it
706 is done in delayed work function */
707 ret = cancel_delayed_work(work);
709 l2cap_chan_put(chan);
714 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
715 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
716 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
717 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
718 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
719 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
720 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
722 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
727 return chan->tx_win_max + 1 - seq2 + seq1;
730 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
732 return (seq + 1) % (chan->tx_win_max + 1);
735 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
740 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
744 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
748 extern bool disable_ertm;
750 int l2cap_init_sockets(void);
751 void l2cap_cleanup_sockets(void);
753 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
754 int __l2cap_wait_ack(struct sock *sk);
756 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
757 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid);
759 struct l2cap_chan *l2cap_chan_create(void);
760 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
761 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
762 bdaddr_t *dst, u8 dst_type);
763 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
765 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
766 int l2cap_chan_check_security(struct l2cap_chan *chan);
767 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
768 int l2cap_ertm_init(struct l2cap_chan *chan);
769 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
770 void l2cap_chan_del(struct l2cap_chan *chan, int err);
772 #endif /* __L2CAP_H */