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_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
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)
58 #define L2CAP_A2MP_DEFAULT_MTU 670
60 /* L2CAP socket address */
62 sa_family_t l2_family;
69 /* L2CAP socket options */
70 #define L2CAP_OPTIONS 0x01
71 struct l2cap_options {
81 #define L2CAP_CONNINFO 0x02
82 struct l2cap_conninfo {
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
95 /* L2CAP command codes */
96 #define L2CAP_COMMAND_REJ 0x01
97 #define L2CAP_CONN_REQ 0x02
98 #define L2CAP_CONN_RSP 0x03
99 #define L2CAP_CONF_REQ 0x04
100 #define L2CAP_CONF_RSP 0x05
101 #define L2CAP_DISCONN_REQ 0x06
102 #define L2CAP_DISCONN_RSP 0x07
103 #define L2CAP_ECHO_REQ 0x08
104 #define L2CAP_ECHO_RSP 0x09
105 #define L2CAP_INFO_REQ 0x0a
106 #define L2CAP_INFO_RSP 0x0b
107 #define L2CAP_CREATE_CHAN_REQ 0x0c
108 #define L2CAP_CREATE_CHAN_RSP 0x0d
109 #define L2CAP_MOVE_CHAN_REQ 0x0e
110 #define L2CAP_MOVE_CHAN_RSP 0x0f
111 #define L2CAP_MOVE_CHAN_CFM 0x10
112 #define L2CAP_MOVE_CHAN_CFM_RSP 0x11
113 #define L2CAP_CONN_PARAM_UPDATE_REQ 0x12
114 #define L2CAP_CONN_PARAM_UPDATE_RSP 0x13
116 /* L2CAP extended feature mask */
117 #define L2CAP_FEAT_FLOWCTL 0x00000001
118 #define L2CAP_FEAT_RETRANS 0x00000002
119 #define L2CAP_FEAT_BIDIR_QOS 0x00000004
120 #define L2CAP_FEAT_ERTM 0x00000008
121 #define L2CAP_FEAT_STREAMING 0x00000010
122 #define L2CAP_FEAT_FCS 0x00000020
123 #define L2CAP_FEAT_EXT_FLOW 0x00000040
124 #define L2CAP_FEAT_FIXED_CHAN 0x00000080
125 #define L2CAP_FEAT_EXT_WINDOW 0x00000100
126 #define L2CAP_FEAT_UCD 0x00000200
128 /* L2CAP checksum option */
129 #define L2CAP_FCS_NONE 0x00
130 #define L2CAP_FCS_CRC16 0x01
132 /* L2CAP fixed channels */
133 #define L2CAP_FC_L2CAP 0x02
134 #define L2CAP_FC_A2MP 0x08
136 /* L2CAP Control Field bit masks */
137 #define L2CAP_CTRL_SAR 0xC000
138 #define L2CAP_CTRL_REQSEQ 0x3F00
139 #define L2CAP_CTRL_TXSEQ 0x007E
140 #define L2CAP_CTRL_SUPERVISE 0x000C
142 #define L2CAP_CTRL_RETRANS 0x0080
143 #define L2CAP_CTRL_FINAL 0x0080
144 #define L2CAP_CTRL_POLL 0x0010
145 #define L2CAP_CTRL_FRAME_TYPE 0x0001 /* I- or S-Frame */
147 #define L2CAP_CTRL_TXSEQ_SHIFT 1
148 #define L2CAP_CTRL_SUPER_SHIFT 2
149 #define L2CAP_CTRL_POLL_SHIFT 4
150 #define L2CAP_CTRL_FINAL_SHIFT 7
151 #define L2CAP_CTRL_REQSEQ_SHIFT 8
152 #define L2CAP_CTRL_SAR_SHIFT 14
154 /* L2CAP Extended Control Field bit mask */
155 #define L2CAP_EXT_CTRL_TXSEQ 0xFFFC0000
156 #define L2CAP_EXT_CTRL_SAR 0x00030000
157 #define L2CAP_EXT_CTRL_SUPERVISE 0x00030000
158 #define L2CAP_EXT_CTRL_REQSEQ 0x0000FFFC
160 #define L2CAP_EXT_CTRL_POLL 0x00040000
161 #define L2CAP_EXT_CTRL_FINAL 0x00000002
162 #define L2CAP_EXT_CTRL_FRAME_TYPE 0x00000001 /* I- or S-Frame */
164 #define L2CAP_EXT_CTRL_FINAL_SHIFT 1
165 #define L2CAP_EXT_CTRL_REQSEQ_SHIFT 2
166 #define L2CAP_EXT_CTRL_SAR_SHIFT 16
167 #define L2CAP_EXT_CTRL_SUPER_SHIFT 16
168 #define L2CAP_EXT_CTRL_POLL_SHIFT 18
169 #define L2CAP_EXT_CTRL_TXSEQ_SHIFT 18
171 /* L2CAP Supervisory Function */
172 #define L2CAP_SUPER_RR 0x00
173 #define L2CAP_SUPER_REJ 0x01
174 #define L2CAP_SUPER_RNR 0x02
175 #define L2CAP_SUPER_SREJ 0x03
177 /* L2CAP Segmentation and Reassembly */
178 #define L2CAP_SAR_UNSEGMENTED 0x00
179 #define L2CAP_SAR_START 0x01
180 #define L2CAP_SAR_END 0x02
181 #define L2CAP_SAR_CONTINUE 0x03
183 /* L2CAP Command rej. reasons */
184 #define L2CAP_REJ_NOT_UNDERSTOOD 0x0000
185 #define L2CAP_REJ_MTU_EXCEEDED 0x0001
186 #define L2CAP_REJ_INVALID_CID 0x0002
188 /* L2CAP structures */
193 #define L2CAP_HDR_SIZE 4
194 #define L2CAP_ENH_HDR_SIZE 6
195 #define L2CAP_EXT_HDR_SIZE 8
197 #define L2CAP_FCS_SIZE 2
198 #define L2CAP_SDULEN_SIZE 2
199 #define L2CAP_PSMLEN_SIZE 2
200 #define L2CAP_ENH_CTRL_SIZE 2
201 #define L2CAP_EXT_CTRL_SIZE 4
203 struct l2cap_cmd_hdr {
208 #define L2CAP_CMD_HDR_SIZE 4
210 struct l2cap_cmd_rej_unk {
214 struct l2cap_cmd_rej_mtu {
219 struct l2cap_cmd_rej_cid {
225 struct l2cap_conn_req {
230 struct l2cap_conn_rsp {
237 /* protocol/service multiplexer (PSM) */
238 #define L2CAP_PSM_SDP 0x0001
239 #define L2CAP_PSM_RFCOMM 0x0003
240 #define L2CAP_PSM_3DSP 0x0021
242 /* channel indentifier */
243 #define L2CAP_CID_SIGNALING 0x0001
244 #define L2CAP_CID_CONN_LESS 0x0002
245 #define L2CAP_CID_A2MP 0x0003
246 #define L2CAP_CID_ATT 0x0004
247 #define L2CAP_CID_LE_SIGNALING 0x0005
248 #define L2CAP_CID_SMP 0x0006
249 #define L2CAP_CID_DYN_START 0x0040
250 #define L2CAP_CID_DYN_END 0xffff
252 /* connect/create channel results */
253 #define L2CAP_CR_SUCCESS 0x0000
254 #define L2CAP_CR_PEND 0x0001
255 #define L2CAP_CR_BAD_PSM 0x0002
256 #define L2CAP_CR_SEC_BLOCK 0x0003
257 #define L2CAP_CR_NO_MEM 0x0004
258 #define L2CAP_CR_BAD_AMP 0x0005
260 /* connect/create channel status */
261 #define L2CAP_CS_NO_INFO 0x0000
262 #define L2CAP_CS_AUTHEN_PEND 0x0001
263 #define L2CAP_CS_AUTHOR_PEND 0x0002
265 struct l2cap_conf_req {
271 struct l2cap_conf_rsp {
278 #define L2CAP_CONF_SUCCESS 0x0000
279 #define L2CAP_CONF_UNACCEPT 0x0001
280 #define L2CAP_CONF_REJECT 0x0002
281 #define L2CAP_CONF_UNKNOWN 0x0003
282 #define L2CAP_CONF_PENDING 0x0004
283 #define L2CAP_CONF_EFS_REJECT 0x0005
285 /* configuration req/rsp continuation flag */
286 #define L2CAP_CONF_FLAG_CONTINUATION 0x0001
288 struct l2cap_conf_opt {
293 #define L2CAP_CONF_OPT_SIZE 2
295 #define L2CAP_CONF_HINT 0x80
296 #define L2CAP_CONF_MASK 0x7f
298 #define L2CAP_CONF_MTU 0x01
299 #define L2CAP_CONF_FLUSH_TO 0x02
300 #define L2CAP_CONF_QOS 0x03
301 #define L2CAP_CONF_RFC 0x04
302 #define L2CAP_CONF_FCS 0x05
303 #define L2CAP_CONF_EFS 0x06
304 #define L2CAP_CONF_EWS 0x07
306 #define L2CAP_CONF_MAX_SIZE 22
308 struct l2cap_conf_rfc {
312 __le16 retrans_timeout;
313 __le16 monitor_timeout;
317 #define L2CAP_MODE_BASIC 0x00
318 #define L2CAP_MODE_RETRANS 0x01
319 #define L2CAP_MODE_FLOWCTL 0x02
320 #define L2CAP_MODE_ERTM 0x03
321 #define L2CAP_MODE_STREAMING 0x04
323 struct l2cap_conf_efs {
332 #define L2CAP_SERV_NOTRAFIC 0x00
333 #define L2CAP_SERV_BESTEFFORT 0x01
334 #define L2CAP_SERV_GUARANTEED 0x02
336 #define L2CAP_BESTEFFORT_ID 0x01
338 struct l2cap_disconn_req {
343 struct l2cap_disconn_rsp {
348 struct l2cap_info_req {
352 struct l2cap_info_rsp {
358 struct l2cap_create_chan_req {
364 struct l2cap_create_chan_rsp {
371 struct l2cap_move_chan_req {
376 struct l2cap_move_chan_rsp {
381 #define L2CAP_MR_SUCCESS 0x0000
382 #define L2CAP_MR_PEND 0x0001
383 #define L2CAP_MR_BAD_ID 0x0002
384 #define L2CAP_MR_SAME_ID 0x0003
385 #define L2CAP_MR_NOT_SUPP 0x0004
386 #define L2CAP_MR_COLLISION 0x0005
387 #define L2CAP_MR_NOT_ALLOWED 0x0006
389 struct l2cap_move_chan_cfm {
394 #define L2CAP_MC_CONFIRMED 0x0000
395 #define L2CAP_MC_UNCONFIRMED 0x0001
397 struct l2cap_move_chan_cfm_rsp {
402 #define L2CAP_IT_CL_MTU 0x0001
403 #define L2CAP_IT_FEAT_MASK 0x0002
404 #define L2CAP_IT_FIXED_CHAN 0x0003
407 #define L2CAP_IR_SUCCESS 0x0000
408 #define L2CAP_IR_NOTSUPP 0x0001
410 struct l2cap_conn_param_update_req {
414 __le16 to_multiplier;
417 struct l2cap_conn_param_update_rsp {
421 /* Connection Parameters result */
422 #define L2CAP_CONN_PARAM_ACCEPTED 0x0000
423 #define L2CAP_CONN_PARAM_REJECTED 0x0001
425 /* ----- L2CAP channels and connections ----- */
426 struct l2cap_seq_list {
433 #define L2CAP_SEQ_LIST_CLEAR 0xFFFF
434 #define L2CAP_SEQ_LIST_TAIL 0x8000
439 struct l2cap_conn *conn;
440 struct hci_conn *hs_hcon;
441 struct hci_chan *hs_hchan;
474 __u16 retrans_timeout;
475 __u16 monitor_timeout;
481 unsigned long conf_state;
482 unsigned long conn_state;
492 __u16 expected_ack_seq;
493 __u16 expected_tx_seq;
495 __u16 srej_save_reqseq;
496 __u16 last_acked_seq;
498 __u16 unacked_frames;
502 struct sk_buff *sdu_last_frag;
511 __u32 local_sdu_itime;
513 __u32 local_flush_to;
518 __u32 remote_sdu_itime;
519 __u32 remote_acc_lat;
520 __u32 remote_flush_to;
522 struct delayed_work chan_timer;
523 struct delayed_work retrans_timer;
524 struct delayed_work monitor_timer;
525 struct delayed_work ack_timer;
527 struct sk_buff *tx_send_head;
528 struct sk_buff_head tx_q;
529 struct sk_buff_head srej_q;
530 struct l2cap_seq_list srej_list;
531 struct l2cap_seq_list retrans_list;
533 struct list_head list;
534 struct list_head global_l;
537 struct l2cap_ops *ops;
544 struct l2cap_chan *(*new_connection) (struct l2cap_chan *chan);
545 int (*recv) (struct l2cap_chan * chan,
546 struct sk_buff *skb);
547 void (*teardown) (struct l2cap_chan *chan, int err);
548 void (*close) (struct l2cap_chan *chan);
549 void (*state_change) (struct l2cap_chan *chan,
551 void (*ready) (struct l2cap_chan *chan);
552 void (*defer) (struct l2cap_chan *chan);
553 struct sk_buff *(*alloc_skb) (struct l2cap_chan *chan,
554 unsigned long len, int nb);
558 struct hci_conn *hcon;
559 struct hci_chan *hchan;
567 __u8 fixed_chan_mask;
573 struct delayed_work info_timer;
577 struct sk_buff *rx_skb;
583 struct delayed_work security_timer;
584 struct smp_chan *smp_chan;
586 struct list_head chan_l;
587 struct mutex chan_lock;
589 struct list_head users;
593 struct list_head list;
594 int (*probe) (struct l2cap_conn *conn, struct l2cap_user *user);
595 void (*remove) (struct l2cap_conn *conn, struct l2cap_user *user);
598 #define L2CAP_INFO_CL_MTU_REQ_SENT 0x01
599 #define L2CAP_INFO_FEAT_MASK_REQ_SENT 0x04
600 #define L2CAP_INFO_FEAT_MASK_REQ_DONE 0x08
602 #define L2CAP_CHAN_RAW 1
603 #define L2CAP_CHAN_CONN_LESS 2
604 #define L2CAP_CHAN_CONN_ORIENTED 3
605 #define L2CAP_CHAN_CONN_FIX_A2MP 4
607 /* ----- L2CAP socket info ----- */
608 #define l2cap_pi(sk) ((struct l2cap_pinfo *) sk)
612 struct l2cap_chan *chan;
613 struct sk_buff *rx_busy_skb;
631 #define L2CAP_CONF_MAX_CONF_REQ 2
632 #define L2CAP_CONF_MAX_CONF_RSP 2
646 /* Definitions for flags in l2cap_chan */
658 L2CAP_TX_STATE_WAIT_F,
663 L2CAP_RX_STATE_SREJ_SENT,
665 L2CAP_RX_STATE_WAIT_P,
666 L2CAP_RX_STATE_WAIT_F,
670 L2CAP_TXSEQ_EXPECTED,
671 L2CAP_TXSEQ_EXPECTED_SREJ,
672 L2CAP_TXSEQ_UNEXPECTED,
673 L2CAP_TXSEQ_UNEXPECTED_SREJ,
674 L2CAP_TXSEQ_DUPLICATE,
675 L2CAP_TXSEQ_DUPLICATE_SREJ,
677 L2CAP_TXSEQ_INVALID_IGNORE,
681 L2CAP_EV_DATA_REQUEST,
682 L2CAP_EV_LOCAL_BUSY_DETECTED,
683 L2CAP_EV_LOCAL_BUSY_CLEAR,
684 L2CAP_EV_RECV_REQSEQ_AND_FBIT,
688 L2CAP_EV_EXPLICIT_POLL,
689 L2CAP_EV_RECV_IFRAME,
698 L2CAP_MOVE_ROLE_NONE,
699 L2CAP_MOVE_ROLE_INITIATOR,
700 L2CAP_MOVE_ROLE_RESPONDER,
707 L2CAP_MOVE_WAIT_RSP_SUCCESS,
708 L2CAP_MOVE_WAIT_CONFIRM,
709 L2CAP_MOVE_WAIT_CONFIRM_RSP,
710 L2CAP_MOVE_WAIT_LOGICAL_COMP,
711 L2CAP_MOVE_WAIT_LOGICAL_CFM,
712 L2CAP_MOVE_WAIT_LOCAL_BUSY,
713 L2CAP_MOVE_WAIT_PREPARE,
716 void l2cap_chan_hold(struct l2cap_chan *c);
717 void l2cap_chan_put(struct l2cap_chan *c);
719 static inline void l2cap_chan_lock(struct l2cap_chan *chan)
721 mutex_lock(&chan->lock);
724 static inline void l2cap_chan_unlock(struct l2cap_chan *chan)
726 mutex_unlock(&chan->lock);
729 static inline void l2cap_set_timer(struct l2cap_chan *chan,
730 struct delayed_work *work, long timeout)
732 BT_DBG("chan %p state %s timeout %ld", chan,
733 state_to_string(chan->state), timeout);
735 /* If delayed work cancelled do not hold(chan)
736 since it is already done with previous set_timer */
737 if (!cancel_delayed_work(work))
738 l2cap_chan_hold(chan);
740 schedule_delayed_work(work, timeout);
743 static inline bool l2cap_clear_timer(struct l2cap_chan *chan,
744 struct delayed_work *work)
748 /* put(chan) if delayed work cancelled otherwise it
749 is done in delayed work function */
750 ret = cancel_delayed_work(work);
752 l2cap_chan_put(chan);
757 #define __set_chan_timer(c, t) l2cap_set_timer(c, &c->chan_timer, (t))
758 #define __clear_chan_timer(c) l2cap_clear_timer(c, &c->chan_timer)
759 #define __clear_retrans_timer(c) l2cap_clear_timer(c, &c->retrans_timer)
760 #define __clear_monitor_timer(c) l2cap_clear_timer(c, &c->monitor_timer)
761 #define __set_ack_timer(c) l2cap_set_timer(c, &chan->ack_timer, \
762 msecs_to_jiffies(L2CAP_DEFAULT_ACK_TO));
763 #define __clear_ack_timer(c) l2cap_clear_timer(c, &c->ack_timer)
765 static inline int __seq_offset(struct l2cap_chan *chan, __u16 seq1, __u16 seq2)
770 return chan->tx_win_max + 1 - seq2 + seq1;
773 static inline __u16 __next_seq(struct l2cap_chan *chan, __u16 seq)
775 return (seq + 1) % (chan->tx_win_max + 1);
778 static inline struct l2cap_chan *l2cap_chan_no_new_connection(struct l2cap_chan *chan)
783 static inline void l2cap_chan_no_teardown(struct l2cap_chan *chan, int err)
787 static inline void l2cap_chan_no_ready(struct l2cap_chan *chan)
791 static inline void l2cap_chan_no_defer(struct l2cap_chan *chan)
795 extern bool disable_ertm;
797 int l2cap_init_sockets(void);
798 void l2cap_cleanup_sockets(void);
799 bool l2cap_is_socket(struct socket *sock);
801 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan);
802 int __l2cap_wait_ack(struct sock *sk);
804 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm);
805 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid);
807 struct l2cap_chan *l2cap_chan_create(void);
808 void l2cap_chan_close(struct l2cap_chan *chan, int reason);
809 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
810 bdaddr_t *dst, u8 dst_type);
811 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
813 void l2cap_chan_busy(struct l2cap_chan *chan, int busy);
814 int l2cap_chan_check_security(struct l2cap_chan *chan);
815 void l2cap_chan_set_defaults(struct l2cap_chan *chan);
816 int l2cap_ertm_init(struct l2cap_chan *chan);
817 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
818 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan);
819 void l2cap_chan_del(struct l2cap_chan *chan, int err);
820 void l2cap_send_conn_req(struct l2cap_chan *chan);
821 void l2cap_move_start(struct l2cap_chan *chan);
822 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
824 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result);
826 void l2cap_conn_get(struct l2cap_conn *conn);
827 void l2cap_conn_put(struct l2cap_conn *conn);
829 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user);
830 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user);
832 #endif /* __L2CAP_H */