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 Copyright (C) 2011 ProFUSION Embedded Systems
8 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License version 2 as
12 published by the Free Software Foundation;
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
17 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
18 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
25 SOFTWARE IS DISCLAIMED.
28 /* Bluetooth L2CAP sockets. */
30 #include <linux/module.h>
31 #include <linux/export.h>
33 #include <net/bluetooth/bluetooth.h>
34 #include <net/bluetooth/hci_core.h>
35 #include <net/bluetooth/l2cap.h>
39 static struct bt_sock_list l2cap_sk_list
= {
40 .lock
= __RW_LOCK_UNLOCKED(l2cap_sk_list
.lock
)
43 static const struct proto_ops l2cap_sock_ops
;
44 static void l2cap_sock_init(struct sock
*sk
, struct sock
*parent
);
45 static struct sock
*l2cap_sock_alloc(struct net
*net
, struct socket
*sock
,
46 int proto
, gfp_t prio
);
48 bool l2cap_is_socket(struct socket
*sock
)
50 return sock
&& sock
->ops
== &l2cap_sock_ops
;
52 EXPORT_SYMBOL(l2cap_is_socket
);
54 static int l2cap_validate_bredr_psm(u16 psm
)
56 /* PSM must be odd and lsb of upper byte must be 0 */
57 if ((psm
& 0x0101) != 0x0001)
60 /* Restrict usage of well-known PSMs */
61 if (psm
< 0x1001 && !capable(CAP_NET_BIND_SERVICE
))
67 static int l2cap_validate_le_psm(u16 psm
)
69 /* Valid LE_PSM ranges are defined only until 0x00ff */
73 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
74 if (psm
<= 0x007f && !capable(CAP_NET_BIND_SERVICE
))
80 static int l2cap_sock_bind(struct socket
*sock
, struct sockaddr
*addr
, int alen
)
82 struct sock
*sk
= sock
->sk
;
83 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
84 struct sockaddr_l2 la
;
89 if (!addr
|| addr
->sa_family
!= AF_BLUETOOTH
)
92 memset(&la
, 0, sizeof(la
));
93 len
= min_t(unsigned int, sizeof(la
), alen
);
94 memcpy(&la
, addr
, len
);
96 if (la
.l2_cid
&& la
.l2_psm
)
99 if (!bdaddr_type_is_valid(la
.l2_bdaddr_type
))
102 if (bdaddr_type_is_le(la
.l2_bdaddr_type
)) {
103 /* We only allow ATT user space socket */
105 la
.l2_cid
!= cpu_to_le16(L2CAP_CID_ATT
))
111 if (sk
->sk_state
!= BT_OPEN
) {
117 __u16 psm
= __le16_to_cpu(la
.l2_psm
);
119 if (la
.l2_bdaddr_type
== BDADDR_BREDR
)
120 err
= l2cap_validate_bredr_psm(psm
);
122 err
= l2cap_validate_le_psm(psm
);
129 err
= l2cap_add_scid(chan
, __le16_to_cpu(la
.l2_cid
));
131 err
= l2cap_add_psm(chan
, &la
.l2_bdaddr
, la
.l2_psm
);
136 switch (chan
->chan_type
) {
137 case L2CAP_CHAN_CONN_LESS
:
138 if (__le16_to_cpu(la
.l2_psm
) == L2CAP_PSM_3DSP
)
139 chan
->sec_level
= BT_SECURITY_SDP
;
141 case L2CAP_CHAN_CONN_ORIENTED
:
142 if (__le16_to_cpu(la
.l2_psm
) == L2CAP_PSM_SDP
||
143 __le16_to_cpu(la
.l2_psm
) == L2CAP_PSM_RFCOMM
)
144 chan
->sec_level
= BT_SECURITY_SDP
;
147 chan
->sec_level
= BT_SECURITY_SDP
;
149 case L2CAP_CHAN_FIXED
:
150 /* Fixed channels default to the L2CAP core not holding a
151 * hci_conn reference for them. For fixed channels mapping to
152 * L2CAP sockets we do want to hold a reference so set the
153 * appropriate flag to request it.
155 set_bit(FLAG_HOLD_HCI_CONN
, &chan
->flags
);
159 bacpy(&chan
->src
, &la
.l2_bdaddr
);
160 chan
->src_type
= la
.l2_bdaddr_type
;
162 if (chan
->psm
&& bdaddr_type_is_le(chan
->src_type
))
163 chan
->mode
= L2CAP_MODE_LE_FLOWCTL
;
165 chan
->state
= BT_BOUND
;
166 sk
->sk_state
= BT_BOUND
;
173 static int l2cap_sock_connect(struct socket
*sock
, struct sockaddr
*addr
,
176 struct sock
*sk
= sock
->sk
;
177 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
178 struct sockaddr_l2 la
;
183 if (!addr
|| alen
< sizeof(addr
->sa_family
) ||
184 addr
->sa_family
!= AF_BLUETOOTH
)
187 memset(&la
, 0, sizeof(la
));
188 len
= min_t(unsigned int, sizeof(la
), alen
);
189 memcpy(&la
, addr
, len
);
191 if (la
.l2_cid
&& la
.l2_psm
)
194 if (!bdaddr_type_is_valid(la
.l2_bdaddr_type
))
197 /* Check that the socket wasn't bound to something that
198 * conflicts with the address given to connect(). If chan->src
199 * is BDADDR_ANY it means bind() was never used, in which case
200 * chan->src_type and la.l2_bdaddr_type do not need to match.
202 if (chan
->src_type
== BDADDR_BREDR
&& bacmp(&chan
->src
, BDADDR_ANY
) &&
203 bdaddr_type_is_le(la
.l2_bdaddr_type
)) {
204 /* Old user space versions will try to incorrectly bind
205 * the ATT socket using BDADDR_BREDR. We need to accept
206 * this and fix up the source address type only when
207 * both the source CID and destination CID indicate
208 * ATT. Anything else is an invalid combination.
210 if (chan
->scid
!= L2CAP_CID_ATT
||
211 la
.l2_cid
!= cpu_to_le16(L2CAP_CID_ATT
))
214 /* We don't have the hdev available here to make a
215 * better decision on random vs public, but since all
216 * user space versions that exhibit this issue anyway do
217 * not support random local addresses assuming public
218 * here is good enough.
220 chan
->src_type
= BDADDR_LE_PUBLIC
;
223 if (chan
->src_type
!= BDADDR_BREDR
&& la
.l2_bdaddr_type
== BDADDR_BREDR
)
226 if (bdaddr_type_is_le(la
.l2_bdaddr_type
)) {
227 /* We only allow ATT user space socket */
229 la
.l2_cid
!= cpu_to_le16(L2CAP_CID_ATT
))
233 if (chan
->psm
&& bdaddr_type_is_le(chan
->src_type
))
234 chan
->mode
= L2CAP_MODE_LE_FLOWCTL
;
236 err
= l2cap_chan_connect(chan
, la
.l2_psm
, __le16_to_cpu(la
.l2_cid
),
237 &la
.l2_bdaddr
, la
.l2_bdaddr_type
);
243 err
= bt_sock_wait_state(sk
, BT_CONNECTED
,
244 sock_sndtimeo(sk
, flags
& O_NONBLOCK
));
251 static int l2cap_sock_listen(struct socket
*sock
, int backlog
)
253 struct sock
*sk
= sock
->sk
;
254 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
257 BT_DBG("sk %p backlog %d", sk
, backlog
);
261 if (sk
->sk_state
!= BT_BOUND
) {
266 if (sk
->sk_type
!= SOCK_SEQPACKET
&& sk
->sk_type
!= SOCK_STREAM
) {
271 switch (chan
->mode
) {
272 case L2CAP_MODE_BASIC
:
273 case L2CAP_MODE_LE_FLOWCTL
:
275 case L2CAP_MODE_ERTM
:
276 case L2CAP_MODE_STREAMING
:
285 sk
->sk_max_ack_backlog
= backlog
;
286 sk
->sk_ack_backlog
= 0;
288 /* Listening channels need to use nested locking in order not to
289 * cause lockdep warnings when the created child channels end up
290 * being locked in the same thread as the parent channel.
292 atomic_set(&chan
->nesting
, L2CAP_NESTING_PARENT
);
294 chan
->state
= BT_LISTEN
;
295 sk
->sk_state
= BT_LISTEN
;
302 static int l2cap_sock_accept(struct socket
*sock
, struct socket
*newsock
,
305 DECLARE_WAITQUEUE(wait
, current
);
306 struct sock
*sk
= sock
->sk
, *nsk
;
310 lock_sock_nested(sk
, L2CAP_NESTING_PARENT
);
312 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
314 BT_DBG("sk %p timeo %ld", sk
, timeo
);
316 /* Wait for an incoming connection. (wake-one). */
317 add_wait_queue_exclusive(sk_sleep(sk
), &wait
);
319 set_current_state(TASK_INTERRUPTIBLE
);
321 if (sk
->sk_state
!= BT_LISTEN
) {
326 nsk
= bt_accept_dequeue(sk
, newsock
);
335 if (signal_pending(current
)) {
336 err
= sock_intr_errno(timeo
);
341 timeo
= schedule_timeout(timeo
);
342 lock_sock_nested(sk
, L2CAP_NESTING_PARENT
);
344 __set_current_state(TASK_RUNNING
);
345 remove_wait_queue(sk_sleep(sk
), &wait
);
350 newsock
->state
= SS_CONNECTED
;
352 BT_DBG("new socket %p", nsk
);
359 static int l2cap_sock_getname(struct socket
*sock
, struct sockaddr
*addr
,
362 struct sockaddr_l2
*la
= (struct sockaddr_l2
*) addr
;
363 struct sock
*sk
= sock
->sk
;
364 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
366 BT_DBG("sock %p, sk %p", sock
, sk
);
368 if (peer
&& sk
->sk_state
!= BT_CONNECTED
&&
369 sk
->sk_state
!= BT_CONNECT
&& sk
->sk_state
!= BT_CONNECT2
&&
370 sk
->sk_state
!= BT_CONFIG
)
373 memset(la
, 0, sizeof(struct sockaddr_l2
));
374 addr
->sa_family
= AF_BLUETOOTH
;
375 *len
= sizeof(struct sockaddr_l2
);
377 la
->l2_psm
= chan
->psm
;
380 bacpy(&la
->l2_bdaddr
, &chan
->dst
);
381 la
->l2_cid
= cpu_to_le16(chan
->dcid
);
382 la
->l2_bdaddr_type
= chan
->dst_type
;
384 bacpy(&la
->l2_bdaddr
, &chan
->src
);
385 la
->l2_cid
= cpu_to_le16(chan
->scid
);
386 la
->l2_bdaddr_type
= chan
->src_type
;
392 static int l2cap_sock_getsockopt_old(struct socket
*sock
, int optname
,
393 char __user
*optval
, int __user
*optlen
)
395 struct sock
*sk
= sock
->sk
;
396 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
397 struct l2cap_options opts
;
398 struct l2cap_conninfo cinfo
;
404 if (get_user(len
, optlen
))
411 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
412 * legacy ATT code depends on getsockopt for
413 * L2CAP_OPTIONS we need to let this pass.
415 if (bdaddr_type_is_le(chan
->src_type
) &&
416 chan
->scid
!= L2CAP_CID_ATT
) {
421 memset(&opts
, 0, sizeof(opts
));
422 opts
.imtu
= chan
->imtu
;
423 opts
.omtu
= chan
->omtu
;
424 opts
.flush_to
= chan
->flush_to
;
425 opts
.mode
= chan
->mode
;
426 opts
.fcs
= chan
->fcs
;
427 opts
.max_tx
= chan
->max_tx
;
428 opts
.txwin_size
= chan
->tx_win
;
430 len
= min_t(unsigned int, len
, sizeof(opts
));
431 if (copy_to_user(optval
, (char *) &opts
, len
))
437 switch (chan
->sec_level
) {
438 case BT_SECURITY_LOW
:
441 case BT_SECURITY_MEDIUM
:
442 opt
= L2CAP_LM_AUTH
| L2CAP_LM_ENCRYPT
;
444 case BT_SECURITY_HIGH
:
445 opt
= L2CAP_LM_AUTH
| L2CAP_LM_ENCRYPT
|
448 case BT_SECURITY_FIPS
:
449 opt
= L2CAP_LM_AUTH
| L2CAP_LM_ENCRYPT
|
450 L2CAP_LM_SECURE
| L2CAP_LM_FIPS
;
457 if (test_bit(FLAG_ROLE_SWITCH
, &chan
->flags
))
458 opt
|= L2CAP_LM_MASTER
;
460 if (test_bit(FLAG_FORCE_RELIABLE
, &chan
->flags
))
461 opt
|= L2CAP_LM_RELIABLE
;
463 if (put_user(opt
, (u32 __user
*) optval
))
469 if (sk
->sk_state
!= BT_CONNECTED
&&
470 !(sk
->sk_state
== BT_CONNECT2
&&
471 test_bit(BT_SK_DEFER_SETUP
, &bt_sk(sk
)->flags
))) {
476 memset(&cinfo
, 0, sizeof(cinfo
));
477 cinfo
.hci_handle
= chan
->conn
->hcon
->handle
;
478 memcpy(cinfo
.dev_class
, chan
->conn
->hcon
->dev_class
, 3);
480 len
= min_t(unsigned int, len
, sizeof(cinfo
));
481 if (copy_to_user(optval
, (char *) &cinfo
, len
))
495 static int l2cap_sock_getsockopt(struct socket
*sock
, int level
, int optname
,
496 char __user
*optval
, int __user
*optlen
)
498 struct sock
*sk
= sock
->sk
;
499 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
500 struct bt_security sec
;
506 if (level
== SOL_L2CAP
)
507 return l2cap_sock_getsockopt_old(sock
, optname
, optval
, optlen
);
509 if (level
!= SOL_BLUETOOTH
)
512 if (get_user(len
, optlen
))
519 if (chan
->chan_type
!= L2CAP_CHAN_CONN_ORIENTED
&&
520 chan
->chan_type
!= L2CAP_CHAN_FIXED
&&
521 chan
->chan_type
!= L2CAP_CHAN_RAW
) {
526 memset(&sec
, 0, sizeof(sec
));
528 sec
.level
= chan
->conn
->hcon
->sec_level
;
530 if (sk
->sk_state
== BT_CONNECTED
)
531 sec
.key_size
= chan
->conn
->hcon
->enc_key_size
;
533 sec
.level
= chan
->sec_level
;
536 len
= min_t(unsigned int, len
, sizeof(sec
));
537 if (copy_to_user(optval
, (char *) &sec
, len
))
543 if (sk
->sk_state
!= BT_BOUND
&& sk
->sk_state
!= BT_LISTEN
) {
548 if (put_user(test_bit(BT_SK_DEFER_SETUP
, &bt_sk(sk
)->flags
),
549 (u32 __user
*) optval
))
555 if (put_user(test_bit(FLAG_FLUSHABLE
, &chan
->flags
),
556 (u32 __user
*) optval
))
562 if (sk
->sk_type
!= SOCK_SEQPACKET
&& sk
->sk_type
!= SOCK_STREAM
563 && sk
->sk_type
!= SOCK_RAW
) {
568 pwr
.force_active
= test_bit(FLAG_FORCE_ACTIVE
, &chan
->flags
);
570 len
= min_t(unsigned int, len
, sizeof(pwr
));
571 if (copy_to_user(optval
, (char *) &pwr
, len
))
576 case BT_CHANNEL_POLICY
:
577 if (put_user(chan
->chan_policy
, (u32 __user
*) optval
))
582 if (!bdaddr_type_is_le(chan
->src_type
)) {
587 if (sk
->sk_state
!= BT_CONNECTED
) {
592 if (put_user(chan
->omtu
, (u16 __user
*) optval
))
597 if (!bdaddr_type_is_le(chan
->src_type
)) {
602 if (put_user(chan
->imtu
, (u16 __user
*) optval
))
615 static bool l2cap_valid_mtu(struct l2cap_chan
*chan
, u16 mtu
)
617 switch (chan
->scid
) {
619 if (mtu
< L2CAP_LE_MIN_MTU
)
624 if (mtu
< L2CAP_DEFAULT_MIN_MTU
)
631 static int l2cap_sock_setsockopt_old(struct socket
*sock
, int optname
,
632 char __user
*optval
, unsigned int optlen
)
634 struct sock
*sk
= sock
->sk
;
635 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
636 struct l2cap_options opts
;
646 if (bdaddr_type_is_le(chan
->src_type
)) {
651 if (sk
->sk_state
== BT_CONNECTED
) {
656 opts
.imtu
= chan
->imtu
;
657 opts
.omtu
= chan
->omtu
;
658 opts
.flush_to
= chan
->flush_to
;
659 opts
.mode
= chan
->mode
;
660 opts
.fcs
= chan
->fcs
;
661 opts
.max_tx
= chan
->max_tx
;
662 opts
.txwin_size
= chan
->tx_win
;
664 len
= min_t(unsigned int, sizeof(opts
), optlen
);
665 if (copy_from_user((char *) &opts
, optval
, len
)) {
670 if (opts
.txwin_size
> L2CAP_DEFAULT_EXT_WINDOW
) {
675 if (!l2cap_valid_mtu(chan
, opts
.imtu
)) {
680 chan
->mode
= opts
.mode
;
681 switch (chan
->mode
) {
682 case L2CAP_MODE_LE_FLOWCTL
:
684 case L2CAP_MODE_BASIC
:
685 clear_bit(CONF_STATE2_DEVICE
, &chan
->conf_state
);
687 case L2CAP_MODE_ERTM
:
688 case L2CAP_MODE_STREAMING
:
697 chan
->imtu
= opts
.imtu
;
698 chan
->omtu
= opts
.omtu
;
699 chan
->fcs
= opts
.fcs
;
700 chan
->max_tx
= opts
.max_tx
;
701 chan
->tx_win
= opts
.txwin_size
;
702 chan
->flush_to
= opts
.flush_to
;
706 if (get_user(opt
, (u32 __user
*) optval
)) {
711 if (opt
& L2CAP_LM_FIPS
) {
716 if (opt
& L2CAP_LM_AUTH
)
717 chan
->sec_level
= BT_SECURITY_LOW
;
718 if (opt
& L2CAP_LM_ENCRYPT
)
719 chan
->sec_level
= BT_SECURITY_MEDIUM
;
720 if (opt
& L2CAP_LM_SECURE
)
721 chan
->sec_level
= BT_SECURITY_HIGH
;
723 if (opt
& L2CAP_LM_MASTER
)
724 set_bit(FLAG_ROLE_SWITCH
, &chan
->flags
);
726 clear_bit(FLAG_ROLE_SWITCH
, &chan
->flags
);
728 if (opt
& L2CAP_LM_RELIABLE
)
729 set_bit(FLAG_FORCE_RELIABLE
, &chan
->flags
);
731 clear_bit(FLAG_FORCE_RELIABLE
, &chan
->flags
);
743 static int l2cap_sock_setsockopt(struct socket
*sock
, int level
, int optname
,
744 char __user
*optval
, unsigned int optlen
)
746 struct sock
*sk
= sock
->sk
;
747 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
748 struct bt_security sec
;
750 struct l2cap_conn
*conn
;
756 if (level
== SOL_L2CAP
)
757 return l2cap_sock_setsockopt_old(sock
, optname
, optval
, optlen
);
759 if (level
!= SOL_BLUETOOTH
)
766 if (chan
->chan_type
!= L2CAP_CHAN_CONN_ORIENTED
&&
767 chan
->chan_type
!= L2CAP_CHAN_FIXED
&&
768 chan
->chan_type
!= L2CAP_CHAN_RAW
) {
773 sec
.level
= BT_SECURITY_LOW
;
775 len
= min_t(unsigned int, sizeof(sec
), optlen
);
776 if (copy_from_user((char *) &sec
, optval
, len
)) {
781 if (sec
.level
< BT_SECURITY_LOW
||
782 sec
.level
> BT_SECURITY_HIGH
) {
787 chan
->sec_level
= sec
.level
;
794 /*change security for LE channels */
795 if (chan
->scid
== L2CAP_CID_ATT
) {
796 if (smp_conn_security(conn
->hcon
, sec
.level
))
798 set_bit(FLAG_PENDING_SECURITY
, &chan
->flags
);
799 sk
->sk_state
= BT_CONFIG
;
800 chan
->state
= BT_CONFIG
;
802 /* or for ACL link */
803 } else if ((sk
->sk_state
== BT_CONNECT2
&&
804 test_bit(BT_SK_DEFER_SETUP
, &bt_sk(sk
)->flags
)) ||
805 sk
->sk_state
== BT_CONNECTED
) {
806 if (!l2cap_chan_check_security(chan
, true))
807 set_bit(BT_SK_SUSPEND
, &bt_sk(sk
)->flags
);
809 sk
->sk_state_change(sk
);
816 if (sk
->sk_state
!= BT_BOUND
&& sk
->sk_state
!= BT_LISTEN
) {
821 if (get_user(opt
, (u32 __user
*) optval
)) {
827 set_bit(BT_SK_DEFER_SETUP
, &bt_sk(sk
)->flags
);
828 set_bit(FLAG_DEFER_SETUP
, &chan
->flags
);
830 clear_bit(BT_SK_DEFER_SETUP
, &bt_sk(sk
)->flags
);
831 clear_bit(FLAG_DEFER_SETUP
, &chan
->flags
);
836 if (get_user(opt
, (u32 __user
*) optval
)) {
841 if (opt
> BT_FLUSHABLE_ON
) {
846 if (opt
== BT_FLUSHABLE_OFF
) {
848 /* proceed further only when we have l2cap_conn and
849 No Flush support in the LM */
850 if (!conn
|| !lmp_no_flush_capable(conn
->hcon
->hdev
)) {
857 set_bit(FLAG_FLUSHABLE
, &chan
->flags
);
859 clear_bit(FLAG_FLUSHABLE
, &chan
->flags
);
863 if (chan
->chan_type
!= L2CAP_CHAN_CONN_ORIENTED
&&
864 chan
->chan_type
!= L2CAP_CHAN_RAW
) {
869 pwr
.force_active
= BT_POWER_FORCE_ACTIVE_ON
;
871 len
= min_t(unsigned int, sizeof(pwr
), optlen
);
872 if (copy_from_user((char *) &pwr
, optval
, len
)) {
877 if (pwr
.force_active
)
878 set_bit(FLAG_FORCE_ACTIVE
, &chan
->flags
);
880 clear_bit(FLAG_FORCE_ACTIVE
, &chan
->flags
);
883 case BT_CHANNEL_POLICY
:
884 if (get_user(opt
, (u32 __user
*) optval
)) {
889 if (opt
> BT_CHANNEL_POLICY_AMP_PREFERRED
) {
894 if (chan
->mode
!= L2CAP_MODE_ERTM
&&
895 chan
->mode
!= L2CAP_MODE_STREAMING
) {
900 chan
->chan_policy
= (u8
) opt
;
902 if (sk
->sk_state
== BT_CONNECTED
&&
903 chan
->move_role
== L2CAP_MOVE_ROLE_NONE
)
904 l2cap_move_start(chan
);
909 if (!bdaddr_type_is_le(chan
->src_type
)) {
914 /* Setting is not supported as it's the remote side that
921 if (!bdaddr_type_is_le(chan
->src_type
)) {
926 if (sk
->sk_state
== BT_CONNECTED
) {
931 if (get_user(opt
, (u32 __user
*) optval
)) {
948 static int l2cap_sock_sendmsg(struct kiocb
*iocb
, struct socket
*sock
,
949 struct msghdr
*msg
, size_t len
)
951 struct sock
*sk
= sock
->sk
;
952 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
955 BT_DBG("sock %p, sk %p", sock
, sk
);
957 err
= sock_error(sk
);
961 if (msg
->msg_flags
& MSG_OOB
)
964 if (sk
->sk_state
!= BT_CONNECTED
)
968 err
= bt_sock_wait_ready(sk
, msg
->msg_flags
);
973 l2cap_chan_lock(chan
);
974 err
= l2cap_chan_send(chan
, msg
, len
);
975 l2cap_chan_unlock(chan
);
980 static int l2cap_sock_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
981 struct msghdr
*msg
, size_t len
, int flags
)
983 struct sock
*sk
= sock
->sk
;
984 struct l2cap_pinfo
*pi
= l2cap_pi(sk
);
989 if (sk
->sk_state
== BT_CONNECT2
&& test_bit(BT_SK_DEFER_SETUP
,
990 &bt_sk(sk
)->flags
)) {
991 if (bdaddr_type_is_le(pi
->chan
->src_type
)) {
992 sk
->sk_state
= BT_CONNECTED
;
993 pi
->chan
->state
= BT_CONNECTED
;
994 __l2cap_le_connect_rsp_defer(pi
->chan
);
996 sk
->sk_state
= BT_CONFIG
;
997 pi
->chan
->state
= BT_CONFIG
;
998 __l2cap_connect_rsp_defer(pi
->chan
);
1007 if (sock
->type
== SOCK_STREAM
)
1008 err
= bt_sock_stream_recvmsg(iocb
, sock
, msg
, len
, flags
);
1010 err
= bt_sock_recvmsg(iocb
, sock
, msg
, len
, flags
);
1012 if (pi
->chan
->mode
!= L2CAP_MODE_ERTM
)
1015 /* Attempt to put pending rx data in the socket buffer */
1019 if (!test_bit(CONN_LOCAL_BUSY
, &pi
->chan
->conn_state
))
1022 if (pi
->rx_busy_skb
) {
1023 if (!sock_queue_rcv_skb(sk
, pi
->rx_busy_skb
))
1024 pi
->rx_busy_skb
= NULL
;
1029 /* Restore data flow when half of the receive buffer is
1030 * available. This avoids resending large numbers of
1033 if (atomic_read(&sk
->sk_rmem_alloc
) <= sk
->sk_rcvbuf
>> 1)
1034 l2cap_chan_busy(pi
->chan
, 0);
1041 /* Kill socket (only if zapped and orphan)
1042 * Must be called on unlocked socket.
1044 static void l2cap_sock_kill(struct sock
*sk
)
1046 if (!sock_flag(sk
, SOCK_ZAPPED
) || sk
->sk_socket
)
1049 BT_DBG("sk %p state %s", sk
, state_to_string(sk
->sk_state
));
1051 /* Kill poor orphan */
1053 l2cap_chan_put(l2cap_pi(sk
)->chan
);
1054 sock_set_flag(sk
, SOCK_DEAD
);
1058 static int __l2cap_wait_ack(struct sock
*sk
)
1060 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
1061 DECLARE_WAITQUEUE(wait
, current
);
1065 add_wait_queue(sk_sleep(sk
), &wait
);
1066 set_current_state(TASK_INTERRUPTIBLE
);
1067 while (chan
->unacked_frames
> 0 && chan
->conn
) {
1071 if (signal_pending(current
)) {
1072 err
= sock_intr_errno(timeo
);
1077 timeo
= schedule_timeout(timeo
);
1079 set_current_state(TASK_INTERRUPTIBLE
);
1081 err
= sock_error(sk
);
1085 set_current_state(TASK_RUNNING
);
1086 remove_wait_queue(sk_sleep(sk
), &wait
);
1090 static int l2cap_sock_shutdown(struct socket
*sock
, int how
)
1092 struct sock
*sk
= sock
->sk
;
1093 struct l2cap_chan
*chan
;
1094 struct l2cap_conn
*conn
;
1097 BT_DBG("sock %p, sk %p", sock
, sk
);
1102 chan
= l2cap_pi(sk
)->chan
;
1105 BT_DBG("chan %p state %s", chan
, state_to_string(chan
->state
));
1108 mutex_lock(&conn
->chan_lock
);
1110 l2cap_chan_lock(chan
);
1113 if (!sk
->sk_shutdown
) {
1114 if (chan
->mode
== L2CAP_MODE_ERTM
)
1115 err
= __l2cap_wait_ack(sk
);
1117 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1120 l2cap_chan_close(chan
, 0);
1123 if (sock_flag(sk
, SOCK_LINGER
) && sk
->sk_lingertime
&&
1124 !(current
->flags
& PF_EXITING
))
1125 err
= bt_sock_wait_state(sk
, BT_CLOSED
,
1129 if (!err
&& sk
->sk_err
)
1133 l2cap_chan_unlock(chan
);
1136 mutex_unlock(&conn
->chan_lock
);
1141 static int l2cap_sock_release(struct socket
*sock
)
1143 struct sock
*sk
= sock
->sk
;
1146 BT_DBG("sock %p, sk %p", sock
, sk
);
1151 bt_sock_unlink(&l2cap_sk_list
, sk
);
1153 err
= l2cap_sock_shutdown(sock
, 2);
1156 l2cap_sock_kill(sk
);
1160 static void l2cap_sock_cleanup_listen(struct sock
*parent
)
1164 BT_DBG("parent %p state %s", parent
,
1165 state_to_string(parent
->sk_state
));
1167 /* Close not yet accepted channels */
1168 while ((sk
= bt_accept_dequeue(parent
, NULL
))) {
1169 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
1171 BT_DBG("child chan %p state %s", chan
,
1172 state_to_string(chan
->state
));
1174 l2cap_chan_lock(chan
);
1175 __clear_chan_timer(chan
);
1176 l2cap_chan_close(chan
, ECONNRESET
);
1177 l2cap_chan_unlock(chan
);
1179 l2cap_sock_kill(sk
);
1183 static struct l2cap_chan
*l2cap_sock_new_connection_cb(struct l2cap_chan
*chan
)
1185 struct sock
*sk
, *parent
= chan
->data
;
1189 /* Check for backlog size */
1190 if (sk_acceptq_is_full(parent
)) {
1191 BT_DBG("backlog full %d", parent
->sk_ack_backlog
);
1192 release_sock(parent
);
1196 sk
= l2cap_sock_alloc(sock_net(parent
), NULL
, BTPROTO_L2CAP
,
1199 release_sock(parent
);
1203 bt_sock_reclassify_lock(sk
, BTPROTO_L2CAP
);
1205 l2cap_sock_init(sk
, parent
);
1207 bt_accept_enqueue(parent
, sk
);
1209 release_sock(parent
);
1211 return l2cap_pi(sk
)->chan
;
1214 static int l2cap_sock_recv_cb(struct l2cap_chan
*chan
, struct sk_buff
*skb
)
1216 struct sock
*sk
= chan
->data
;
1221 if (l2cap_pi(sk
)->rx_busy_skb
) {
1226 err
= sock_queue_rcv_skb(sk
, skb
);
1228 /* For ERTM, handle one skb that doesn't fit into the recv
1229 * buffer. This is important to do because the data frames
1230 * have already been acked, so the skb cannot be discarded.
1232 * Notify the l2cap core that the buffer is full, so the
1233 * LOCAL_BUSY state is entered and no more frames are
1234 * acked and reassembled until there is buffer space
1237 if (err
< 0 && chan
->mode
== L2CAP_MODE_ERTM
) {
1238 l2cap_pi(sk
)->rx_busy_skb
= skb
;
1239 l2cap_chan_busy(chan
, 1);
1249 static void l2cap_sock_close_cb(struct l2cap_chan
*chan
)
1251 struct sock
*sk
= chan
->data
;
1253 l2cap_sock_kill(sk
);
1256 static void l2cap_sock_teardown_cb(struct l2cap_chan
*chan
, int err
)
1258 struct sock
*sk
= chan
->data
;
1259 struct sock
*parent
;
1261 BT_DBG("chan %p state %s", chan
, state_to_string(chan
->state
));
1263 /* This callback can be called both for server (BT_LISTEN)
1264 * sockets as well as "normal" ones. To avoid lockdep warnings
1265 * with child socket locking (through l2cap_sock_cleanup_listen)
1266 * we need separation into separate nesting levels. The simplest
1267 * way to accomplish this is to inherit the nesting level used
1270 lock_sock_nested(sk
, atomic_read(&chan
->nesting
));
1272 parent
= bt_sk(sk
)->parent
;
1274 sock_set_flag(sk
, SOCK_ZAPPED
);
1276 switch (chan
->state
) {
1282 l2cap_sock_cleanup_listen(sk
);
1283 sk
->sk_state
= BT_CLOSED
;
1284 chan
->state
= BT_CLOSED
;
1288 sk
->sk_state
= BT_CLOSED
;
1289 chan
->state
= BT_CLOSED
;
1294 bt_accept_unlink(sk
);
1295 parent
->sk_data_ready(parent
);
1297 sk
->sk_state_change(sk
);
1306 static void l2cap_sock_state_change_cb(struct l2cap_chan
*chan
, int state
,
1309 struct sock
*sk
= chan
->data
;
1311 sk
->sk_state
= state
;
1317 static struct sk_buff
*l2cap_sock_alloc_skb_cb(struct l2cap_chan
*chan
,
1318 unsigned long hdr_len
,
1319 unsigned long len
, int nb
)
1321 struct sock
*sk
= chan
->data
;
1322 struct sk_buff
*skb
;
1325 l2cap_chan_unlock(chan
);
1326 skb
= bt_skb_send_alloc(sk
, hdr_len
+ len
, nb
, &err
);
1327 l2cap_chan_lock(chan
);
1330 return ERR_PTR(err
);
1332 skb
->priority
= sk
->sk_priority
;
1334 bt_cb(skb
)->chan
= chan
;
1339 static int l2cap_sock_memcpy_fromiovec_cb(struct l2cap_chan
*chan
,
1340 unsigned char *kdata
,
1341 struct iovec
*iov
, int len
)
1343 return memcpy_fromiovec(kdata
, iov
, len
);
1346 static void l2cap_sock_ready_cb(struct l2cap_chan
*chan
)
1348 struct sock
*sk
= chan
->data
;
1349 struct sock
*parent
;
1353 parent
= bt_sk(sk
)->parent
;
1355 BT_DBG("sk %p, parent %p", sk
, parent
);
1357 sk
->sk_state
= BT_CONNECTED
;
1358 sk
->sk_state_change(sk
);
1361 parent
->sk_data_ready(parent
);
1366 static void l2cap_sock_defer_cb(struct l2cap_chan
*chan
)
1368 struct sock
*parent
, *sk
= chan
->data
;
1372 parent
= bt_sk(sk
)->parent
;
1374 parent
->sk_data_ready(parent
);
1379 static void l2cap_sock_resume_cb(struct l2cap_chan
*chan
)
1381 struct sock
*sk
= chan
->data
;
1383 if (test_and_clear_bit(FLAG_PENDING_SECURITY
, &chan
->flags
)) {
1384 sk
->sk_state
= BT_CONNECTED
;
1385 chan
->state
= BT_CONNECTED
;
1388 clear_bit(BT_SK_SUSPEND
, &bt_sk(sk
)->flags
);
1389 sk
->sk_state_change(sk
);
1392 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan
*chan
)
1394 struct sock
*sk
= chan
->data
;
1397 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1401 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan
*chan
)
1403 struct sock
*sk
= chan
->data
;
1405 return sk
->sk_sndtimeo
;
1408 static void l2cap_sock_suspend_cb(struct l2cap_chan
*chan
)
1410 struct sock
*sk
= chan
->data
;
1412 set_bit(BT_SK_SUSPEND
, &bt_sk(sk
)->flags
);
1413 sk
->sk_state_change(sk
);
1416 static const struct l2cap_ops l2cap_chan_ops
= {
1417 .name
= "L2CAP Socket Interface",
1418 .new_connection
= l2cap_sock_new_connection_cb
,
1419 .recv
= l2cap_sock_recv_cb
,
1420 .close
= l2cap_sock_close_cb
,
1421 .teardown
= l2cap_sock_teardown_cb
,
1422 .state_change
= l2cap_sock_state_change_cb
,
1423 .ready
= l2cap_sock_ready_cb
,
1424 .defer
= l2cap_sock_defer_cb
,
1425 .resume
= l2cap_sock_resume_cb
,
1426 .suspend
= l2cap_sock_suspend_cb
,
1427 .set_shutdown
= l2cap_sock_set_shutdown_cb
,
1428 .get_sndtimeo
= l2cap_sock_get_sndtimeo_cb
,
1429 .alloc_skb
= l2cap_sock_alloc_skb_cb
,
1430 .memcpy_fromiovec
= l2cap_sock_memcpy_fromiovec_cb
,
1433 static void l2cap_sock_destruct(struct sock
*sk
)
1435 BT_DBG("sk %p", sk
);
1437 if (l2cap_pi(sk
)->chan
)
1438 l2cap_chan_put(l2cap_pi(sk
)->chan
);
1440 if (l2cap_pi(sk
)->rx_busy_skb
) {
1441 kfree_skb(l2cap_pi(sk
)->rx_busy_skb
);
1442 l2cap_pi(sk
)->rx_busy_skb
= NULL
;
1445 skb_queue_purge(&sk
->sk_receive_queue
);
1446 skb_queue_purge(&sk
->sk_write_queue
);
1449 static void l2cap_skb_msg_name(struct sk_buff
*skb
, void *msg_name
,
1452 DECLARE_SOCKADDR(struct sockaddr_l2
*, la
, msg_name
);
1454 memset(la
, 0, sizeof(struct sockaddr_l2
));
1455 la
->l2_family
= AF_BLUETOOTH
;
1456 la
->l2_psm
= bt_cb(skb
)->psm
;
1457 bacpy(&la
->l2_bdaddr
, &bt_cb(skb
)->bdaddr
);
1459 *msg_namelen
= sizeof(struct sockaddr_l2
);
1462 static void l2cap_sock_init(struct sock
*sk
, struct sock
*parent
)
1464 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
1466 BT_DBG("sk %p", sk
);
1469 struct l2cap_chan
*pchan
= l2cap_pi(parent
)->chan
;
1471 sk
->sk_type
= parent
->sk_type
;
1472 bt_sk(sk
)->flags
= bt_sk(parent
)->flags
;
1474 chan
->chan_type
= pchan
->chan_type
;
1475 chan
->imtu
= pchan
->imtu
;
1476 chan
->omtu
= pchan
->omtu
;
1477 chan
->conf_state
= pchan
->conf_state
;
1478 chan
->mode
= pchan
->mode
;
1479 chan
->fcs
= pchan
->fcs
;
1480 chan
->max_tx
= pchan
->max_tx
;
1481 chan
->tx_win
= pchan
->tx_win
;
1482 chan
->tx_win_max
= pchan
->tx_win_max
;
1483 chan
->sec_level
= pchan
->sec_level
;
1484 chan
->flags
= pchan
->flags
;
1485 chan
->tx_credits
= pchan
->tx_credits
;
1486 chan
->rx_credits
= pchan
->rx_credits
;
1488 if (chan
->chan_type
== L2CAP_CHAN_FIXED
) {
1489 chan
->scid
= pchan
->scid
;
1490 chan
->dcid
= pchan
->scid
;
1493 security_sk_clone(parent
, sk
);
1495 switch (sk
->sk_type
) {
1497 chan
->chan_type
= L2CAP_CHAN_RAW
;
1500 chan
->chan_type
= L2CAP_CHAN_CONN_LESS
;
1501 bt_sk(sk
)->skb_msg_name
= l2cap_skb_msg_name
;
1503 case SOCK_SEQPACKET
:
1505 chan
->chan_type
= L2CAP_CHAN_CONN_ORIENTED
;
1509 chan
->imtu
= L2CAP_DEFAULT_MTU
;
1511 if (!disable_ertm
&& sk
->sk_type
== SOCK_STREAM
) {
1512 chan
->mode
= L2CAP_MODE_ERTM
;
1513 set_bit(CONF_STATE2_DEVICE
, &chan
->conf_state
);
1515 chan
->mode
= L2CAP_MODE_BASIC
;
1518 l2cap_chan_set_defaults(chan
);
1521 /* Default config options */
1522 chan
->flush_to
= L2CAP_DEFAULT_FLUSH_TO
;
1525 chan
->ops
= &l2cap_chan_ops
;
1528 static struct proto l2cap_proto
= {
1530 .owner
= THIS_MODULE
,
1531 .obj_size
= sizeof(struct l2cap_pinfo
)
1534 static struct sock
*l2cap_sock_alloc(struct net
*net
, struct socket
*sock
,
1535 int proto
, gfp_t prio
)
1538 struct l2cap_chan
*chan
;
1540 sk
= sk_alloc(net
, PF_BLUETOOTH
, prio
, &l2cap_proto
);
1544 sock_init_data(sock
, sk
);
1545 INIT_LIST_HEAD(&bt_sk(sk
)->accept_q
);
1547 sk
->sk_destruct
= l2cap_sock_destruct
;
1548 sk
->sk_sndtimeo
= L2CAP_CONN_TIMEOUT
;
1550 sock_reset_flag(sk
, SOCK_ZAPPED
);
1552 sk
->sk_protocol
= proto
;
1553 sk
->sk_state
= BT_OPEN
;
1555 chan
= l2cap_chan_create();
1561 l2cap_chan_hold(chan
);
1563 l2cap_pi(sk
)->chan
= chan
;
1568 static int l2cap_sock_create(struct net
*net
, struct socket
*sock
, int protocol
,
1573 BT_DBG("sock %p", sock
);
1575 sock
->state
= SS_UNCONNECTED
;
1577 if (sock
->type
!= SOCK_SEQPACKET
&& sock
->type
!= SOCK_STREAM
&&
1578 sock
->type
!= SOCK_DGRAM
&& sock
->type
!= SOCK_RAW
)
1579 return -ESOCKTNOSUPPORT
;
1581 if (sock
->type
== SOCK_RAW
&& !kern
&& !capable(CAP_NET_RAW
))
1584 sock
->ops
= &l2cap_sock_ops
;
1586 sk
= l2cap_sock_alloc(net
, sock
, protocol
, GFP_ATOMIC
);
1590 l2cap_sock_init(sk
, NULL
);
1591 bt_sock_link(&l2cap_sk_list
, sk
);
1595 static const struct proto_ops l2cap_sock_ops
= {
1596 .family
= PF_BLUETOOTH
,
1597 .owner
= THIS_MODULE
,
1598 .release
= l2cap_sock_release
,
1599 .bind
= l2cap_sock_bind
,
1600 .connect
= l2cap_sock_connect
,
1601 .listen
= l2cap_sock_listen
,
1602 .accept
= l2cap_sock_accept
,
1603 .getname
= l2cap_sock_getname
,
1604 .sendmsg
= l2cap_sock_sendmsg
,
1605 .recvmsg
= l2cap_sock_recvmsg
,
1606 .poll
= bt_sock_poll
,
1607 .ioctl
= bt_sock_ioctl
,
1608 .mmap
= sock_no_mmap
,
1609 .socketpair
= sock_no_socketpair
,
1610 .shutdown
= l2cap_sock_shutdown
,
1611 .setsockopt
= l2cap_sock_setsockopt
,
1612 .getsockopt
= l2cap_sock_getsockopt
1615 static const struct net_proto_family l2cap_sock_family_ops
= {
1616 .family
= PF_BLUETOOTH
,
1617 .owner
= THIS_MODULE
,
1618 .create
= l2cap_sock_create
,
1621 int __init
l2cap_init_sockets(void)
1625 err
= proto_register(&l2cap_proto
, 0);
1629 err
= bt_sock_register(BTPROTO_L2CAP
, &l2cap_sock_family_ops
);
1631 BT_ERR("L2CAP socket registration failed");
1635 err
= bt_procfs_init(&init_net
, "l2cap", &l2cap_sk_list
,
1638 BT_ERR("Failed to create L2CAP proc file");
1639 bt_sock_unregister(BTPROTO_L2CAP
);
1643 BT_INFO("L2CAP socket layer initialized");
1648 proto_unregister(&l2cap_proto
);
1652 void l2cap_cleanup_sockets(void)
1654 bt_procfs_cleanup(&init_net
, "l2cap");
1655 bt_sock_unregister(BTPROTO_L2CAP
);
1656 proto_unregister(&l2cap_proto
);