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>
32 #include <linux/filter.h>
33 #include <linux/sched/signal.h>
35 #include <net/bluetooth/bluetooth.h>
36 #include <net/bluetooth/hci_core.h>
37 #include <net/bluetooth/l2cap.h>
41 static struct bt_sock_list l2cap_sk_list
= {
42 .lock
= __RW_LOCK_UNLOCKED(l2cap_sk_list
.lock
)
45 static const struct proto_ops l2cap_sock_ops
;
46 static void l2cap_sock_init(struct sock
*sk
, struct sock
*parent
);
47 static struct sock
*l2cap_sock_alloc(struct net
*net
, struct socket
*sock
,
48 int proto
, gfp_t prio
, int kern
);
49 static void l2cap_sock_cleanup_listen(struct sock
*parent
);
51 bool l2cap_is_socket(struct socket
*sock
)
53 return sock
&& sock
->ops
== &l2cap_sock_ops
;
55 EXPORT_SYMBOL(l2cap_is_socket
);
57 static int l2cap_validate_bredr_psm(u16 psm
)
59 /* PSM must be odd and lsb of upper byte must be 0 */
60 if ((psm
& 0x0101) != 0x0001)
63 /* Restrict usage of well-known PSMs */
64 if (psm
< L2CAP_PSM_DYN_START
&& !capable(CAP_NET_BIND_SERVICE
))
70 static int l2cap_validate_le_psm(u16 psm
)
72 /* Valid LE_PSM ranges are defined only until 0x00ff */
73 if (psm
> L2CAP_PSM_LE_DYN_END
)
76 /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
77 if (psm
< L2CAP_PSM_LE_DYN_START
&& !capable(CAP_NET_BIND_SERVICE
))
83 static int l2cap_sock_bind(struct socket
*sock
, struct sockaddr
*addr
, int alen
)
85 struct sock
*sk
= sock
->sk
;
86 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
87 struct sockaddr_l2 la
;
92 if (!addr
|| alen
< offsetofend(struct sockaddr
, sa_family
) ||
93 addr
->sa_family
!= AF_BLUETOOTH
)
96 memset(&la
, 0, sizeof(la
));
97 len
= min_t(unsigned int, sizeof(la
), alen
);
98 memcpy(&la
, addr
, len
);
100 if (la
.l2_cid
&& la
.l2_psm
)
103 if (!bdaddr_type_is_valid(la
.l2_bdaddr_type
))
106 if (bdaddr_type_is_le(la
.l2_bdaddr_type
)) {
107 /* We only allow ATT user space socket */
109 la
.l2_cid
!= cpu_to_le16(L2CAP_CID_ATT
))
115 if (sk
->sk_state
!= BT_OPEN
) {
121 __u16 psm
= __le16_to_cpu(la
.l2_psm
);
123 if (la
.l2_bdaddr_type
== BDADDR_BREDR
)
124 err
= l2cap_validate_bredr_psm(psm
);
126 err
= l2cap_validate_le_psm(psm
);
132 bacpy(&chan
->src
, &la
.l2_bdaddr
);
133 chan
->src_type
= la
.l2_bdaddr_type
;
136 err
= l2cap_add_scid(chan
, __le16_to_cpu(la
.l2_cid
));
138 err
= l2cap_add_psm(chan
, &la
.l2_bdaddr
, la
.l2_psm
);
143 switch (chan
->chan_type
) {
144 case L2CAP_CHAN_CONN_LESS
:
145 if (__le16_to_cpu(la
.l2_psm
) == L2CAP_PSM_3DSP
)
146 chan
->sec_level
= BT_SECURITY_SDP
;
148 case L2CAP_CHAN_CONN_ORIENTED
:
149 if (__le16_to_cpu(la
.l2_psm
) == L2CAP_PSM_SDP
||
150 __le16_to_cpu(la
.l2_psm
) == L2CAP_PSM_RFCOMM
)
151 chan
->sec_level
= BT_SECURITY_SDP
;
154 chan
->sec_level
= BT_SECURITY_SDP
;
156 case L2CAP_CHAN_FIXED
:
157 /* Fixed channels default to the L2CAP core not holding a
158 * hci_conn reference for them. For fixed channels mapping to
159 * L2CAP sockets we do want to hold a reference so set the
160 * appropriate flag to request it.
162 set_bit(FLAG_HOLD_HCI_CONN
, &chan
->flags
);
166 /* Use L2CAP_MODE_LE_FLOWCTL (CoC) in case of LE address and
167 * L2CAP_MODE_EXT_FLOWCTL (ECRED) has not been set.
169 if (chan
->psm
&& bdaddr_type_is_le(chan
->src_type
) &&
170 chan
->mode
!= L2CAP_MODE_EXT_FLOWCTL
)
171 chan
->mode
= L2CAP_MODE_LE_FLOWCTL
;
173 chan
->state
= BT_BOUND
;
174 sk
->sk_state
= BT_BOUND
;
181 static int l2cap_sock_connect(struct socket
*sock
, struct sockaddr
*addr
,
184 struct sock
*sk
= sock
->sk
;
185 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
186 struct sockaddr_l2 la
;
193 zapped
= sock_flag(sk
, SOCK_ZAPPED
);
199 if (!addr
|| alen
< offsetofend(struct sockaddr
, sa_family
) ||
200 addr
->sa_family
!= AF_BLUETOOTH
)
203 memset(&la
, 0, sizeof(la
));
204 len
= min_t(unsigned int, sizeof(la
), alen
);
205 memcpy(&la
, addr
, len
);
207 if (la
.l2_cid
&& la
.l2_psm
)
210 if (!bdaddr_type_is_valid(la
.l2_bdaddr_type
))
213 /* Check that the socket wasn't bound to something that
214 * conflicts with the address given to connect(). If chan->src
215 * is BDADDR_ANY it means bind() was never used, in which case
216 * chan->src_type and la.l2_bdaddr_type do not need to match.
218 if (chan
->src_type
== BDADDR_BREDR
&& bacmp(&chan
->src
, BDADDR_ANY
) &&
219 bdaddr_type_is_le(la
.l2_bdaddr_type
)) {
220 /* Old user space versions will try to incorrectly bind
221 * the ATT socket using BDADDR_BREDR. We need to accept
222 * this and fix up the source address type only when
223 * both the source CID and destination CID indicate
224 * ATT. Anything else is an invalid combination.
226 if (chan
->scid
!= L2CAP_CID_ATT
||
227 la
.l2_cid
!= cpu_to_le16(L2CAP_CID_ATT
))
230 /* We don't have the hdev available here to make a
231 * better decision on random vs public, but since all
232 * user space versions that exhibit this issue anyway do
233 * not support random local addresses assuming public
234 * here is good enough.
236 chan
->src_type
= BDADDR_LE_PUBLIC
;
239 if (chan
->src_type
!= BDADDR_BREDR
&& la
.l2_bdaddr_type
== BDADDR_BREDR
)
242 if (bdaddr_type_is_le(la
.l2_bdaddr_type
)) {
243 /* We only allow ATT user space socket */
245 la
.l2_cid
!= cpu_to_le16(L2CAP_CID_ATT
))
249 /* Use L2CAP_MODE_LE_FLOWCTL (CoC) in case of LE address and
250 * L2CAP_MODE_EXT_FLOWCTL (ECRED) has not been set.
252 if (chan
->psm
&& bdaddr_type_is_le(chan
->src_type
) &&
253 chan
->mode
!= L2CAP_MODE_EXT_FLOWCTL
)
254 chan
->mode
= L2CAP_MODE_LE_FLOWCTL
;
256 err
= l2cap_chan_connect(chan
, la
.l2_psm
, __le16_to_cpu(la
.l2_cid
),
257 &la
.l2_bdaddr
, la
.l2_bdaddr_type
,
264 err
= bt_sock_wait_state(sk
, BT_CONNECTED
,
265 sock_sndtimeo(sk
, flags
& O_NONBLOCK
));
272 static int l2cap_sock_listen(struct socket
*sock
, int backlog
)
274 struct sock
*sk
= sock
->sk
;
275 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
278 BT_DBG("sk %p backlog %d", sk
, backlog
);
282 if (sk
->sk_state
!= BT_BOUND
) {
287 if (sk
->sk_type
!= SOCK_SEQPACKET
&& sk
->sk_type
!= SOCK_STREAM
) {
292 switch (chan
->mode
) {
293 case L2CAP_MODE_BASIC
:
294 case L2CAP_MODE_LE_FLOWCTL
:
296 case L2CAP_MODE_EXT_FLOWCTL
:
302 case L2CAP_MODE_ERTM
:
303 case L2CAP_MODE_STREAMING
:
312 sk
->sk_max_ack_backlog
= backlog
;
313 sk
->sk_ack_backlog
= 0;
315 /* Listening channels need to use nested locking in order not to
316 * cause lockdep warnings when the created child channels end up
317 * being locked in the same thread as the parent channel.
319 atomic_set(&chan
->nesting
, L2CAP_NESTING_PARENT
);
321 chan
->state
= BT_LISTEN
;
322 sk
->sk_state
= BT_LISTEN
;
329 static int l2cap_sock_accept(struct socket
*sock
, struct socket
*newsock
,
330 struct proto_accept_arg
*arg
)
332 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
333 struct sock
*sk
= sock
->sk
, *nsk
;
337 lock_sock_nested(sk
, L2CAP_NESTING_PARENT
);
339 timeo
= sock_rcvtimeo(sk
, arg
->flags
& O_NONBLOCK
);
341 BT_DBG("sk %p timeo %ld", sk
, timeo
);
343 /* Wait for an incoming connection. (wake-one). */
344 add_wait_queue_exclusive(sk_sleep(sk
), &wait
);
346 if (sk
->sk_state
!= BT_LISTEN
) {
351 nsk
= bt_accept_dequeue(sk
, newsock
);
360 if (signal_pending(current
)) {
361 err
= sock_intr_errno(timeo
);
367 timeo
= wait_woken(&wait
, TASK_INTERRUPTIBLE
, timeo
);
369 lock_sock_nested(sk
, L2CAP_NESTING_PARENT
);
371 remove_wait_queue(sk_sleep(sk
), &wait
);
376 newsock
->state
= SS_CONNECTED
;
378 BT_DBG("new socket %p", nsk
);
385 static int l2cap_sock_getname(struct socket
*sock
, struct sockaddr
*addr
,
388 struct sockaddr_l2
*la
= (struct sockaddr_l2
*) addr
;
389 struct sock
*sk
= sock
->sk
;
390 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
392 BT_DBG("sock %p, sk %p", sock
, sk
);
394 if (peer
&& sk
->sk_state
!= BT_CONNECTED
&&
395 sk
->sk_state
!= BT_CONNECT
&& sk
->sk_state
!= BT_CONNECT2
&&
396 sk
->sk_state
!= BT_CONFIG
)
399 memset(la
, 0, sizeof(struct sockaddr_l2
));
400 addr
->sa_family
= AF_BLUETOOTH
;
402 la
->l2_psm
= chan
->psm
;
405 bacpy(&la
->l2_bdaddr
, &chan
->dst
);
406 la
->l2_cid
= cpu_to_le16(chan
->dcid
);
407 la
->l2_bdaddr_type
= chan
->dst_type
;
409 bacpy(&la
->l2_bdaddr
, &chan
->src
);
410 la
->l2_cid
= cpu_to_le16(chan
->scid
);
411 la
->l2_bdaddr_type
= chan
->src_type
;
414 return sizeof(struct sockaddr_l2
);
417 static int l2cap_get_mode(struct l2cap_chan
*chan
)
419 switch (chan
->mode
) {
420 case L2CAP_MODE_BASIC
:
421 return BT_MODE_BASIC
;
422 case L2CAP_MODE_ERTM
:
424 case L2CAP_MODE_STREAMING
:
425 return BT_MODE_STREAMING
;
426 case L2CAP_MODE_LE_FLOWCTL
:
427 return BT_MODE_LE_FLOWCTL
;
428 case L2CAP_MODE_EXT_FLOWCTL
:
429 return BT_MODE_EXT_FLOWCTL
;
435 static int l2cap_sock_getsockopt_old(struct socket
*sock
, int optname
,
436 char __user
*optval
, int __user
*optlen
)
438 struct sock
*sk
= sock
->sk
;
439 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
440 struct l2cap_options opts
;
441 struct l2cap_conninfo cinfo
;
448 if (get_user(len
, optlen
))
455 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
456 * legacy ATT code depends on getsockopt for
457 * L2CAP_OPTIONS we need to let this pass.
459 if (bdaddr_type_is_le(chan
->src_type
) &&
460 chan
->scid
!= L2CAP_CID_ATT
) {
465 /* Only BR/EDR modes are supported here */
466 switch (chan
->mode
) {
467 case L2CAP_MODE_BASIC
:
468 case L2CAP_MODE_ERTM
:
469 case L2CAP_MODE_STREAMING
:
479 memset(&opts
, 0, sizeof(opts
));
480 opts
.imtu
= chan
->imtu
;
481 opts
.omtu
= chan
->omtu
;
482 opts
.flush_to
= chan
->flush_to
;
483 opts
.mode
= chan
->mode
;
484 opts
.fcs
= chan
->fcs
;
485 opts
.max_tx
= chan
->max_tx
;
486 opts
.txwin_size
= chan
->tx_win
;
488 BT_DBG("mode 0x%2.2x", chan
->mode
);
490 len
= min(len
, sizeof(opts
));
491 if (copy_to_user(optval
, (char *) &opts
, len
))
497 switch (chan
->sec_level
) {
498 case BT_SECURITY_LOW
:
501 case BT_SECURITY_MEDIUM
:
502 opt
= L2CAP_LM_AUTH
| L2CAP_LM_ENCRYPT
;
504 case BT_SECURITY_HIGH
:
505 opt
= L2CAP_LM_AUTH
| L2CAP_LM_ENCRYPT
|
508 case BT_SECURITY_FIPS
:
509 opt
= L2CAP_LM_AUTH
| L2CAP_LM_ENCRYPT
|
510 L2CAP_LM_SECURE
| L2CAP_LM_FIPS
;
517 if (test_bit(FLAG_ROLE_SWITCH
, &chan
->flags
))
518 opt
|= L2CAP_LM_MASTER
;
520 if (test_bit(FLAG_FORCE_RELIABLE
, &chan
->flags
))
521 opt
|= L2CAP_LM_RELIABLE
;
523 if (put_user(opt
, (u32 __user
*) optval
))
529 if (sk
->sk_state
!= BT_CONNECTED
&&
530 !(sk
->sk_state
== BT_CONNECT2
&&
531 test_bit(BT_SK_DEFER_SETUP
, &bt_sk(sk
)->flags
))) {
536 memset(&cinfo
, 0, sizeof(cinfo
));
537 cinfo
.hci_handle
= chan
->conn
->hcon
->handle
;
538 memcpy(cinfo
.dev_class
, chan
->conn
->hcon
->dev_class
, 3);
540 len
= min(len
, sizeof(cinfo
));
541 if (copy_to_user(optval
, (char *) &cinfo
, len
))
555 static int l2cap_sock_getsockopt(struct socket
*sock
, int level
, int optname
,
556 char __user
*optval
, int __user
*optlen
)
558 struct sock
*sk
= sock
->sk
;
559 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
560 struct bt_security sec
;
563 int len
, mode
, err
= 0;
567 if (level
== SOL_L2CAP
)
568 return l2cap_sock_getsockopt_old(sock
, optname
, optval
, optlen
);
570 if (level
!= SOL_BLUETOOTH
)
573 if (get_user(len
, optlen
))
580 if (chan
->chan_type
!= L2CAP_CHAN_CONN_ORIENTED
&&
581 chan
->chan_type
!= L2CAP_CHAN_FIXED
&&
582 chan
->chan_type
!= L2CAP_CHAN_RAW
) {
587 memset(&sec
, 0, sizeof(sec
));
589 sec
.level
= chan
->conn
->hcon
->sec_level
;
591 if (sk
->sk_state
== BT_CONNECTED
)
592 sec
.key_size
= chan
->conn
->hcon
->enc_key_size
;
594 sec
.level
= chan
->sec_level
;
597 len
= min_t(unsigned int, len
, sizeof(sec
));
598 if (copy_to_user(optval
, (char *) &sec
, len
))
604 if (sk
->sk_state
!= BT_BOUND
&& sk
->sk_state
!= BT_LISTEN
) {
609 if (put_user(test_bit(BT_SK_DEFER_SETUP
, &bt_sk(sk
)->flags
),
610 (u32 __user
*) optval
))
616 if (put_user(test_bit(FLAG_FLUSHABLE
, &chan
->flags
),
617 (u32 __user
*) optval
))
623 if (sk
->sk_type
!= SOCK_SEQPACKET
&& sk
->sk_type
!= SOCK_STREAM
624 && sk
->sk_type
!= SOCK_RAW
) {
629 pwr
.force_active
= test_bit(FLAG_FORCE_ACTIVE
, &chan
->flags
);
631 len
= min_t(unsigned int, len
, sizeof(pwr
));
632 if (copy_to_user(optval
, (char *) &pwr
, len
))
637 case BT_CHANNEL_POLICY
:
638 if (put_user(chan
->chan_policy
, (u32 __user
*) optval
))
643 if (!bdaddr_type_is_le(chan
->src_type
)) {
648 if (sk
->sk_state
!= BT_CONNECTED
) {
653 if (put_user(chan
->omtu
, (u16 __user
*) optval
))
658 if (!bdaddr_type_is_le(chan
->src_type
)) {
663 if (put_user(chan
->imtu
, (u16 __user
*) optval
))
668 if (sk
->sk_state
!= BT_CONNECTED
) {
673 phys
= hci_conn_get_phy(chan
->conn
->hcon
);
675 if (put_user(phys
, (u32 __user
*) optval
))
685 if (chan
->chan_type
!= L2CAP_CHAN_CONN_ORIENTED
) {
690 mode
= l2cap_get_mode(chan
);
696 if (put_user(mode
, (u8 __user
*) optval
))
709 static bool l2cap_valid_mtu(struct l2cap_chan
*chan
, u16 mtu
)
711 switch (chan
->scid
) {
713 if (mtu
< L2CAP_LE_MIN_MTU
)
718 if (mtu
< L2CAP_DEFAULT_MIN_MTU
)
725 static int l2cap_sock_setsockopt_old(struct socket
*sock
, int optname
,
726 sockptr_t optval
, unsigned int optlen
)
728 struct sock
*sk
= sock
->sk
;
729 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
730 struct l2cap_options opts
;
740 if (bdaddr_type_is_le(chan
->src_type
)) {
745 if (sk
->sk_state
== BT_CONNECTED
) {
750 opts
.imtu
= chan
->imtu
;
751 opts
.omtu
= chan
->omtu
;
752 opts
.flush_to
= chan
->flush_to
;
753 opts
.mode
= chan
->mode
;
754 opts
.fcs
= chan
->fcs
;
755 opts
.max_tx
= chan
->max_tx
;
756 opts
.txwin_size
= chan
->tx_win
;
758 err
= bt_copy_from_sockptr(&opts
, sizeof(opts
), optval
, optlen
);
762 if (opts
.txwin_size
> L2CAP_DEFAULT_EXT_WINDOW
) {
767 if (!l2cap_valid_mtu(chan
, opts
.imtu
)) {
772 /* Only BR/EDR modes are supported here */
774 case L2CAP_MODE_BASIC
:
775 clear_bit(CONF_STATE2_DEVICE
, &chan
->conf_state
);
777 case L2CAP_MODE_ERTM
:
778 case L2CAP_MODE_STREAMING
:
790 chan
->mode
= opts
.mode
;
792 BT_DBG("mode 0x%2.2x", chan
->mode
);
794 chan
->imtu
= opts
.imtu
;
795 chan
->omtu
= opts
.omtu
;
796 chan
->fcs
= opts
.fcs
;
797 chan
->max_tx
= opts
.max_tx
;
798 chan
->tx_win
= opts
.txwin_size
;
799 chan
->flush_to
= opts
.flush_to
;
803 err
= bt_copy_from_sockptr(&opt
, sizeof(opt
), optval
, optlen
);
807 if (opt
& L2CAP_LM_FIPS
) {
812 if (opt
& L2CAP_LM_AUTH
)
813 chan
->sec_level
= BT_SECURITY_LOW
;
814 if (opt
& L2CAP_LM_ENCRYPT
)
815 chan
->sec_level
= BT_SECURITY_MEDIUM
;
816 if (opt
& L2CAP_LM_SECURE
)
817 chan
->sec_level
= BT_SECURITY_HIGH
;
819 if (opt
& L2CAP_LM_MASTER
)
820 set_bit(FLAG_ROLE_SWITCH
, &chan
->flags
);
822 clear_bit(FLAG_ROLE_SWITCH
, &chan
->flags
);
824 if (opt
& L2CAP_LM_RELIABLE
)
825 set_bit(FLAG_FORCE_RELIABLE
, &chan
->flags
);
827 clear_bit(FLAG_FORCE_RELIABLE
, &chan
->flags
);
839 static int l2cap_set_mode(struct l2cap_chan
*chan
, u8 mode
)
843 if (bdaddr_type_is_le(chan
->src_type
))
845 mode
= L2CAP_MODE_BASIC
;
846 clear_bit(CONF_STATE2_DEVICE
, &chan
->conf_state
);
849 if (!disable_ertm
|| bdaddr_type_is_le(chan
->src_type
))
851 mode
= L2CAP_MODE_ERTM
;
853 case BT_MODE_STREAMING
:
854 if (!disable_ertm
|| bdaddr_type_is_le(chan
->src_type
))
856 mode
= L2CAP_MODE_STREAMING
;
858 case BT_MODE_LE_FLOWCTL
:
859 if (!bdaddr_type_is_le(chan
->src_type
))
861 mode
= L2CAP_MODE_LE_FLOWCTL
;
863 case BT_MODE_EXT_FLOWCTL
:
864 /* TODO: Add support for ECRED PDUs to BR/EDR */
865 if (!bdaddr_type_is_le(chan
->src_type
))
867 mode
= L2CAP_MODE_EXT_FLOWCTL
;
878 static int l2cap_sock_setsockopt(struct socket
*sock
, int level
, int optname
,
879 sockptr_t optval
, unsigned int optlen
)
881 struct sock
*sk
= sock
->sk
;
882 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
883 struct bt_security sec
;
885 struct l2cap_conn
*conn
;
893 if (level
== SOL_L2CAP
)
894 return l2cap_sock_setsockopt_old(sock
, optname
, optval
, optlen
);
896 if (level
!= SOL_BLUETOOTH
)
903 if (chan
->chan_type
!= L2CAP_CHAN_CONN_ORIENTED
&&
904 chan
->chan_type
!= L2CAP_CHAN_FIXED
&&
905 chan
->chan_type
!= L2CAP_CHAN_RAW
) {
910 sec
.level
= BT_SECURITY_LOW
;
912 err
= bt_copy_from_sockptr(&sec
, sizeof(sec
), optval
, optlen
);
916 if (sec
.level
< BT_SECURITY_LOW
||
917 sec
.level
> BT_SECURITY_FIPS
) {
922 chan
->sec_level
= sec
.level
;
929 /* change security for LE channels */
930 if (chan
->scid
== L2CAP_CID_ATT
) {
931 if (smp_conn_security(conn
->hcon
, sec
.level
)) {
936 set_bit(FLAG_PENDING_SECURITY
, &chan
->flags
);
937 sk
->sk_state
= BT_CONFIG
;
938 chan
->state
= BT_CONFIG
;
940 /* or for ACL link */
941 } else if ((sk
->sk_state
== BT_CONNECT2
&&
942 test_bit(BT_SK_DEFER_SETUP
, &bt_sk(sk
)->flags
)) ||
943 sk
->sk_state
== BT_CONNECTED
) {
944 if (!l2cap_chan_check_security(chan
, true))
945 set_bit(BT_SK_SUSPEND
, &bt_sk(sk
)->flags
);
947 sk
->sk_state_change(sk
);
954 if (sk
->sk_state
!= BT_BOUND
&& sk
->sk_state
!= BT_LISTEN
) {
959 err
= bt_copy_from_sockptr(&opt
, sizeof(opt
), optval
, optlen
);
964 set_bit(BT_SK_DEFER_SETUP
, &bt_sk(sk
)->flags
);
965 set_bit(FLAG_DEFER_SETUP
, &chan
->flags
);
967 clear_bit(BT_SK_DEFER_SETUP
, &bt_sk(sk
)->flags
);
968 clear_bit(FLAG_DEFER_SETUP
, &chan
->flags
);
973 err
= bt_copy_from_sockptr(&opt
, sizeof(opt
), optval
, optlen
);
977 if (opt
> BT_FLUSHABLE_ON
) {
982 if (opt
== BT_FLUSHABLE_OFF
) {
984 /* proceed further only when we have l2cap_conn and
985 No Flush support in the LM */
986 if (!conn
|| !lmp_no_flush_capable(conn
->hcon
->hdev
)) {
993 set_bit(FLAG_FLUSHABLE
, &chan
->flags
);
995 clear_bit(FLAG_FLUSHABLE
, &chan
->flags
);
999 if (chan
->chan_type
!= L2CAP_CHAN_CONN_ORIENTED
&&
1000 chan
->chan_type
!= L2CAP_CHAN_RAW
) {
1005 pwr
.force_active
= BT_POWER_FORCE_ACTIVE_ON
;
1007 err
= bt_copy_from_sockptr(&pwr
, sizeof(pwr
), optval
, optlen
);
1011 if (pwr
.force_active
)
1012 set_bit(FLAG_FORCE_ACTIVE
, &chan
->flags
);
1014 clear_bit(FLAG_FORCE_ACTIVE
, &chan
->flags
);
1017 case BT_CHANNEL_POLICY
:
1018 err
= bt_copy_from_sockptr(&opt
, sizeof(opt
), optval
, optlen
);
1026 if (!bdaddr_type_is_le(chan
->src_type
)) {
1031 /* Setting is not supported as it's the remote side that
1038 if (!bdaddr_type_is_le(chan
->src_type
)) {
1043 if (chan
->mode
== L2CAP_MODE_LE_FLOWCTL
&&
1044 sk
->sk_state
== BT_CONNECTED
) {
1049 err
= bt_copy_from_sockptr(&mtu
, sizeof(mtu
), optval
, optlen
);
1053 if (chan
->mode
== L2CAP_MODE_EXT_FLOWCTL
&&
1054 sk
->sk_state
== BT_CONNECTED
)
1055 err
= l2cap_chan_reconfigure(chan
, mtu
);
1062 if (!enable_ecred
) {
1067 BT_DBG("sk->sk_state %u", sk
->sk_state
);
1069 if (sk
->sk_state
!= BT_BOUND
) {
1074 if (chan
->chan_type
!= L2CAP_CHAN_CONN_ORIENTED
) {
1079 err
= bt_copy_from_sockptr(&mode
, sizeof(mode
), optval
, optlen
);
1083 BT_DBG("mode %u", mode
);
1085 err
= l2cap_set_mode(chan
, mode
);
1089 BT_DBG("mode 0x%2.2x", chan
->mode
);
1102 static int l2cap_sock_sendmsg(struct socket
*sock
, struct msghdr
*msg
,
1105 struct sock
*sk
= sock
->sk
;
1106 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
1109 BT_DBG("sock %p, sk %p", sock
, sk
);
1111 err
= sock_error(sk
);
1115 if (msg
->msg_flags
& MSG_OOB
)
1118 if (sk
->sk_state
!= BT_CONNECTED
)
1122 err
= bt_sock_wait_ready(sk
, msg
->msg_flags
);
1127 l2cap_chan_lock(chan
);
1128 err
= l2cap_chan_send(chan
, msg
, len
);
1129 l2cap_chan_unlock(chan
);
1134 static void l2cap_publish_rx_avail(struct l2cap_chan
*chan
)
1136 struct sock
*sk
= chan
->data
;
1137 ssize_t avail
= sk
->sk_rcvbuf
- atomic_read(&sk
->sk_rmem_alloc
);
1138 int expected_skbs
, skb_overhead
;
1141 l2cap_chan_rx_avail(chan
, 0);
1146 l2cap_chan_rx_avail(chan
, -1);
1150 /* Correct available memory by estimated sk_buff overhead.
1151 * This is significant due to small transfer sizes. However, accept
1152 * at least one full packet if receive space is non-zero.
1154 expected_skbs
= DIV_ROUND_UP(avail
, chan
->mps
);
1155 skb_overhead
= expected_skbs
* sizeof(struct sk_buff
);
1156 if (skb_overhead
< avail
)
1157 l2cap_chan_rx_avail(chan
, avail
- skb_overhead
);
1159 l2cap_chan_rx_avail(chan
, -1);
1162 static int l2cap_sock_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
1163 size_t len
, int flags
)
1165 struct sock
*sk
= sock
->sk
;
1166 struct l2cap_pinfo
*pi
= l2cap_pi(sk
);
1171 if (sk
->sk_state
== BT_CONNECT2
&& test_bit(BT_SK_DEFER_SETUP
,
1172 &bt_sk(sk
)->flags
)) {
1173 if (pi
->chan
->mode
== L2CAP_MODE_EXT_FLOWCTL
) {
1174 sk
->sk_state
= BT_CONNECTED
;
1175 pi
->chan
->state
= BT_CONNECTED
;
1176 __l2cap_ecred_conn_rsp_defer(pi
->chan
);
1177 } else if (bdaddr_type_is_le(pi
->chan
->src_type
)) {
1178 sk
->sk_state
= BT_CONNECTED
;
1179 pi
->chan
->state
= BT_CONNECTED
;
1180 __l2cap_le_connect_rsp_defer(pi
->chan
);
1182 sk
->sk_state
= BT_CONFIG
;
1183 pi
->chan
->state
= BT_CONFIG
;
1184 __l2cap_connect_rsp_defer(pi
->chan
);
1193 if (sock
->type
== SOCK_STREAM
)
1194 err
= bt_sock_stream_recvmsg(sock
, msg
, len
, flags
);
1196 err
= bt_sock_recvmsg(sock
, msg
, len
, flags
);
1198 if (pi
->chan
->mode
!= L2CAP_MODE_ERTM
&&
1199 pi
->chan
->mode
!= L2CAP_MODE_LE_FLOWCTL
&&
1200 pi
->chan
->mode
!= L2CAP_MODE_EXT_FLOWCTL
)
1205 l2cap_publish_rx_avail(pi
->chan
);
1207 /* Attempt to put pending rx data in the socket buffer */
1208 while (!list_empty(&pi
->rx_busy
)) {
1209 struct l2cap_rx_busy
*rx_busy
=
1210 list_first_entry(&pi
->rx_busy
,
1211 struct l2cap_rx_busy
,
1213 if (__sock_queue_rcv_skb(sk
, rx_busy
->skb
) < 0)
1215 list_del(&rx_busy
->list
);
1219 /* Restore data flow when half of the receive buffer is
1220 * available. This avoids resending large numbers of
1223 if (test_bit(CONN_LOCAL_BUSY
, &pi
->chan
->conn_state
) &&
1224 atomic_read(&sk
->sk_rmem_alloc
) <= sk
->sk_rcvbuf
>> 1)
1225 l2cap_chan_busy(pi
->chan
, 0);
1232 /* Kill socket (only if zapped and orphan)
1233 * Must be called on unlocked socket, with l2cap channel lock.
1235 static void l2cap_sock_kill(struct sock
*sk
)
1237 if (!sock_flag(sk
, SOCK_ZAPPED
) || sk
->sk_socket
)
1240 BT_DBG("sk %p state %s", sk
, state_to_string(sk
->sk_state
));
1242 /* Kill poor orphan */
1244 l2cap_chan_put(l2cap_pi(sk
)->chan
);
1245 sock_set_flag(sk
, SOCK_DEAD
);
1249 static int __l2cap_wait_ack(struct sock
*sk
, struct l2cap_chan
*chan
)
1251 DECLARE_WAITQUEUE(wait
, current
);
1253 int timeo
= L2CAP_WAIT_ACK_POLL_PERIOD
;
1254 /* Timeout to prevent infinite loop */
1255 unsigned long timeout
= jiffies
+ L2CAP_WAIT_ACK_TIMEOUT
;
1257 add_wait_queue(sk_sleep(sk
), &wait
);
1258 set_current_state(TASK_INTERRUPTIBLE
);
1260 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1261 chan
->unacked_frames
, time_after(jiffies
, timeout
) ? 0 :
1262 jiffies_to_msecs(timeout
- jiffies
));
1265 timeo
= L2CAP_WAIT_ACK_POLL_PERIOD
;
1267 if (signal_pending(current
)) {
1268 err
= sock_intr_errno(timeo
);
1273 timeo
= schedule_timeout(timeo
);
1275 set_current_state(TASK_INTERRUPTIBLE
);
1277 err
= sock_error(sk
);
1281 if (time_after(jiffies
, timeout
)) {
1286 } while (chan
->unacked_frames
> 0 &&
1287 chan
->state
== BT_CONNECTED
);
1289 set_current_state(TASK_RUNNING
);
1290 remove_wait_queue(sk_sleep(sk
), &wait
);
1294 static int l2cap_sock_shutdown(struct socket
*sock
, int how
)
1296 struct sock
*sk
= sock
->sk
;
1297 struct l2cap_chan
*chan
;
1298 struct l2cap_conn
*conn
;
1301 BT_DBG("sock %p, sk %p, how %d", sock
, sk
, how
);
1303 /* 'how' parameter is mapped to sk_shutdown as follows:
1304 * SHUT_RD (0) --> RCV_SHUTDOWN (1)
1305 * SHUT_WR (1) --> SEND_SHUTDOWN (2)
1306 * SHUT_RDWR (2) --> SHUTDOWN_MASK (3)
1315 if ((sk
->sk_shutdown
& how
) == how
)
1316 goto shutdown_already
;
1318 BT_DBG("Handling sock shutdown");
1320 /* prevent sk structure from being freed whilst unlocked */
1323 chan
= l2cap_pi(sk
)->chan
;
1324 /* prevent chan structure from being freed whilst unlocked */
1325 l2cap_chan_hold(chan
);
1327 BT_DBG("chan %p state %s", chan
, state_to_string(chan
->state
));
1329 if (chan
->mode
== L2CAP_MODE_ERTM
&&
1330 chan
->unacked_frames
> 0 &&
1331 chan
->state
== BT_CONNECTED
) {
1332 err
= __l2cap_wait_ack(sk
, chan
);
1334 /* After waiting for ACKs, check whether shutdown
1335 * has already been actioned to close the L2CAP
1336 * link such as by l2cap_disconnection_req().
1338 if ((sk
->sk_shutdown
& how
) == how
)
1339 goto shutdown_matched
;
1342 /* Try setting the RCV_SHUTDOWN bit, return early if SEND_SHUTDOWN
1345 if ((how
& RCV_SHUTDOWN
) && !(sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
1346 sk
->sk_shutdown
|= RCV_SHUTDOWN
;
1347 if ((sk
->sk_shutdown
& how
) == how
)
1348 goto shutdown_matched
;
1351 sk
->sk_shutdown
|= SEND_SHUTDOWN
;
1354 l2cap_chan_lock(chan
);
1357 /* prevent conn structure from being freed */
1358 l2cap_conn_get(conn
);
1359 l2cap_chan_unlock(chan
);
1362 /* mutex lock must be taken before l2cap_chan_lock() */
1363 mutex_lock(&conn
->chan_lock
);
1365 l2cap_chan_lock(chan
);
1366 l2cap_chan_close(chan
, 0);
1367 l2cap_chan_unlock(chan
);
1370 mutex_unlock(&conn
->chan_lock
);
1371 l2cap_conn_put(conn
);
1376 if (sock_flag(sk
, SOCK_LINGER
) && sk
->sk_lingertime
&&
1377 !(current
->flags
& PF_EXITING
))
1378 err
= bt_sock_wait_state(sk
, BT_CLOSED
,
1382 l2cap_chan_put(chan
);
1386 if (!err
&& sk
->sk_err
)
1391 BT_DBG("Sock shutdown complete err: %d", err
);
1396 static int l2cap_sock_release(struct socket
*sock
)
1398 struct sock
*sk
= sock
->sk
;
1400 struct l2cap_chan
*chan
;
1402 BT_DBG("sock %p, sk %p", sock
, sk
);
1407 l2cap_sock_cleanup_listen(sk
);
1408 bt_sock_unlink(&l2cap_sk_list
, sk
);
1410 err
= l2cap_sock_shutdown(sock
, SHUT_RDWR
);
1411 chan
= l2cap_pi(sk
)->chan
;
1413 l2cap_chan_hold(chan
);
1414 l2cap_chan_lock(chan
);
1417 l2cap_sock_kill(sk
);
1419 l2cap_chan_unlock(chan
);
1420 l2cap_chan_put(chan
);
1425 static void l2cap_sock_cleanup_listen(struct sock
*parent
)
1429 BT_DBG("parent %p state %s", parent
,
1430 state_to_string(parent
->sk_state
));
1432 /* Close not yet accepted channels */
1433 while ((sk
= bt_accept_dequeue(parent
, NULL
))) {
1434 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
1436 BT_DBG("child chan %p state %s", chan
,
1437 state_to_string(chan
->state
));
1439 l2cap_chan_hold(chan
);
1440 l2cap_chan_lock(chan
);
1442 __clear_chan_timer(chan
);
1443 l2cap_chan_close(chan
, ECONNRESET
);
1444 l2cap_sock_kill(sk
);
1446 l2cap_chan_unlock(chan
);
1447 l2cap_chan_put(chan
);
1451 static struct l2cap_chan
*l2cap_sock_new_connection_cb(struct l2cap_chan
*chan
)
1453 struct sock
*sk
, *parent
= chan
->data
;
1457 /* Check for backlog size */
1458 if (sk_acceptq_is_full(parent
)) {
1459 BT_DBG("backlog full %d", parent
->sk_ack_backlog
);
1460 release_sock(parent
);
1464 sk
= l2cap_sock_alloc(sock_net(parent
), NULL
, BTPROTO_L2CAP
,
1467 release_sock(parent
);
1471 bt_sock_reclassify_lock(sk
, BTPROTO_L2CAP
);
1473 l2cap_sock_init(sk
, parent
);
1475 bt_accept_enqueue(parent
, sk
, false);
1477 release_sock(parent
);
1479 return l2cap_pi(sk
)->chan
;
1482 static int l2cap_sock_recv_cb(struct l2cap_chan
*chan
, struct sk_buff
*skb
)
1484 struct sock
*sk
= chan
->data
;
1485 struct l2cap_pinfo
*pi
= l2cap_pi(sk
);
1490 if (chan
->mode
== L2CAP_MODE_ERTM
&& !list_empty(&pi
->rx_busy
)) {
1495 if (chan
->mode
!= L2CAP_MODE_ERTM
&&
1496 chan
->mode
!= L2CAP_MODE_STREAMING
&&
1497 chan
->mode
!= L2CAP_MODE_LE_FLOWCTL
&&
1498 chan
->mode
!= L2CAP_MODE_EXT_FLOWCTL
) {
1499 /* Even if no filter is attached, we could potentially
1500 * get errors from security modules, etc.
1502 err
= sk_filter(sk
, skb
);
1507 err
= __sock_queue_rcv_skb(sk
, skb
);
1509 l2cap_publish_rx_avail(chan
);
1511 /* For ERTM and LE, handle a skb that doesn't fit into the recv
1512 * buffer. This is important to do because the data frames
1513 * have already been acked, so the skb cannot be discarded.
1515 * Notify the l2cap core that the buffer is full, so the
1516 * LOCAL_BUSY state is entered and no more frames are
1517 * acked and reassembled until there is buffer space
1521 (chan
->mode
== L2CAP_MODE_ERTM
||
1522 chan
->mode
== L2CAP_MODE_LE_FLOWCTL
||
1523 chan
->mode
== L2CAP_MODE_EXT_FLOWCTL
)) {
1524 struct l2cap_rx_busy
*rx_busy
=
1525 kmalloc(sizeof(*rx_busy
), GFP_KERNEL
);
1531 list_add_tail(&rx_busy
->list
, &pi
->rx_busy
);
1532 l2cap_chan_busy(chan
, 1);
1542 static void l2cap_sock_close_cb(struct l2cap_chan
*chan
)
1544 struct sock
*sk
= chan
->data
;
1549 l2cap_sock_kill(sk
);
1552 static void l2cap_sock_teardown_cb(struct l2cap_chan
*chan
, int err
)
1554 struct sock
*sk
= chan
->data
;
1555 struct sock
*parent
;
1560 BT_DBG("chan %p state %s", chan
, state_to_string(chan
->state
));
1562 /* This callback can be called both for server (BT_LISTEN)
1563 * sockets as well as "normal" ones. To avoid lockdep warnings
1564 * with child socket locking (through l2cap_sock_cleanup_listen)
1565 * we need separation into separate nesting levels. The simplest
1566 * way to accomplish this is to inherit the nesting level used
1569 lock_sock_nested(sk
, atomic_read(&chan
->nesting
));
1571 parent
= bt_sk(sk
)->parent
;
1573 switch (chan
->state
) {
1579 l2cap_sock_cleanup_listen(sk
);
1580 sk
->sk_state
= BT_CLOSED
;
1581 chan
->state
= BT_CLOSED
;
1585 sk
->sk_state
= BT_CLOSED
;
1586 chan
->state
= BT_CLOSED
;
1591 bt_accept_unlink(sk
);
1592 parent
->sk_data_ready(parent
);
1594 sk
->sk_state_change(sk
);
1601 /* Only zap after cleanup to avoid use after free race */
1602 sock_set_flag(sk
, SOCK_ZAPPED
);
1606 static void l2cap_sock_state_change_cb(struct l2cap_chan
*chan
, int state
,
1609 struct sock
*sk
= chan
->data
;
1611 sk
->sk_state
= state
;
1617 static struct sk_buff
*l2cap_sock_alloc_skb_cb(struct l2cap_chan
*chan
,
1618 unsigned long hdr_len
,
1619 unsigned long len
, int nb
)
1621 struct sock
*sk
= chan
->data
;
1622 struct sk_buff
*skb
;
1625 l2cap_chan_unlock(chan
);
1626 skb
= bt_skb_send_alloc(sk
, hdr_len
+ len
, nb
, &err
);
1627 l2cap_chan_lock(chan
);
1630 return ERR_PTR(err
);
1632 /* Channel lock is released before requesting new skb and then
1633 * reacquired thus we need to recheck channel state.
1635 if (chan
->state
!= BT_CONNECTED
) {
1637 return ERR_PTR(-ENOTCONN
);
1640 skb
->priority
= READ_ONCE(sk
->sk_priority
);
1642 bt_cb(skb
)->l2cap
.chan
= chan
;
1647 static void l2cap_sock_ready_cb(struct l2cap_chan
*chan
)
1649 struct sock
*sk
= chan
->data
;
1650 struct sock
*parent
;
1654 parent
= bt_sk(sk
)->parent
;
1656 BT_DBG("sk %p, parent %p", sk
, parent
);
1658 sk
->sk_state
= BT_CONNECTED
;
1659 sk
->sk_state_change(sk
);
1662 parent
->sk_data_ready(parent
);
1667 static void l2cap_sock_defer_cb(struct l2cap_chan
*chan
)
1669 struct sock
*parent
, *sk
= chan
->data
;
1673 parent
= bt_sk(sk
)->parent
;
1675 parent
->sk_data_ready(parent
);
1680 static void l2cap_sock_resume_cb(struct l2cap_chan
*chan
)
1682 struct sock
*sk
= chan
->data
;
1684 if (test_and_clear_bit(FLAG_PENDING_SECURITY
, &chan
->flags
)) {
1685 sk
->sk_state
= BT_CONNECTED
;
1686 chan
->state
= BT_CONNECTED
;
1689 clear_bit(BT_SK_SUSPEND
, &bt_sk(sk
)->flags
);
1690 sk
->sk_state_change(sk
);
1693 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan
*chan
)
1695 struct sock
*sk
= chan
->data
;
1698 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1702 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan
*chan
)
1704 struct sock
*sk
= chan
->data
;
1706 return sk
->sk_sndtimeo
;
1709 static struct pid
*l2cap_sock_get_peer_pid_cb(struct l2cap_chan
*chan
)
1711 struct sock
*sk
= chan
->data
;
1713 return sk
->sk_peer_pid
;
1716 static void l2cap_sock_suspend_cb(struct l2cap_chan
*chan
)
1718 struct sock
*sk
= chan
->data
;
1720 set_bit(BT_SK_SUSPEND
, &bt_sk(sk
)->flags
);
1721 sk
->sk_state_change(sk
);
1724 static int l2cap_sock_filter(struct l2cap_chan
*chan
, struct sk_buff
*skb
)
1726 struct sock
*sk
= chan
->data
;
1728 switch (chan
->mode
) {
1729 case L2CAP_MODE_ERTM
:
1730 case L2CAP_MODE_STREAMING
:
1731 return sk_filter(sk
, skb
);
1737 static const struct l2cap_ops l2cap_chan_ops
= {
1738 .name
= "L2CAP Socket Interface",
1739 .new_connection
= l2cap_sock_new_connection_cb
,
1740 .recv
= l2cap_sock_recv_cb
,
1741 .close
= l2cap_sock_close_cb
,
1742 .teardown
= l2cap_sock_teardown_cb
,
1743 .state_change
= l2cap_sock_state_change_cb
,
1744 .ready
= l2cap_sock_ready_cb
,
1745 .defer
= l2cap_sock_defer_cb
,
1746 .resume
= l2cap_sock_resume_cb
,
1747 .suspend
= l2cap_sock_suspend_cb
,
1748 .set_shutdown
= l2cap_sock_set_shutdown_cb
,
1749 .get_sndtimeo
= l2cap_sock_get_sndtimeo_cb
,
1750 .get_peer_pid
= l2cap_sock_get_peer_pid_cb
,
1751 .alloc_skb
= l2cap_sock_alloc_skb_cb
,
1752 .filter
= l2cap_sock_filter
,
1755 static void l2cap_sock_destruct(struct sock
*sk
)
1757 struct l2cap_rx_busy
*rx_busy
, *next
;
1759 BT_DBG("sk %p", sk
);
1761 if (l2cap_pi(sk
)->chan
) {
1762 l2cap_pi(sk
)->chan
->data
= NULL
;
1763 l2cap_chan_put(l2cap_pi(sk
)->chan
);
1766 list_for_each_entry_safe(rx_busy
, next
, &l2cap_pi(sk
)->rx_busy
, list
) {
1767 kfree_skb(rx_busy
->skb
);
1768 list_del(&rx_busy
->list
);
1772 skb_queue_purge(&sk
->sk_receive_queue
);
1773 skb_queue_purge(&sk
->sk_write_queue
);
1776 static void l2cap_skb_msg_name(struct sk_buff
*skb
, void *msg_name
,
1779 DECLARE_SOCKADDR(struct sockaddr_l2
*, la
, msg_name
);
1781 memset(la
, 0, sizeof(struct sockaddr_l2
));
1782 la
->l2_family
= AF_BLUETOOTH
;
1783 la
->l2_psm
= bt_cb(skb
)->l2cap
.psm
;
1784 bacpy(&la
->l2_bdaddr
, &bt_cb(skb
)->l2cap
.bdaddr
);
1786 *msg_namelen
= sizeof(struct sockaddr_l2
);
1789 static void l2cap_sock_init(struct sock
*sk
, struct sock
*parent
)
1791 struct l2cap_chan
*chan
= l2cap_pi(sk
)->chan
;
1793 BT_DBG("sk %p", sk
);
1796 struct l2cap_chan
*pchan
= l2cap_pi(parent
)->chan
;
1798 sk
->sk_type
= parent
->sk_type
;
1799 bt_sk(sk
)->flags
= bt_sk(parent
)->flags
;
1801 chan
->chan_type
= pchan
->chan_type
;
1802 chan
->imtu
= pchan
->imtu
;
1803 chan
->omtu
= pchan
->omtu
;
1804 chan
->conf_state
= pchan
->conf_state
;
1805 chan
->mode
= pchan
->mode
;
1806 chan
->fcs
= pchan
->fcs
;
1807 chan
->max_tx
= pchan
->max_tx
;
1808 chan
->tx_win
= pchan
->tx_win
;
1809 chan
->tx_win_max
= pchan
->tx_win_max
;
1810 chan
->sec_level
= pchan
->sec_level
;
1811 chan
->flags
= pchan
->flags
;
1812 chan
->tx_credits
= pchan
->tx_credits
;
1813 chan
->rx_credits
= pchan
->rx_credits
;
1815 if (chan
->chan_type
== L2CAP_CHAN_FIXED
) {
1816 chan
->scid
= pchan
->scid
;
1817 chan
->dcid
= pchan
->scid
;
1820 security_sk_clone(parent
, sk
);
1822 switch (sk
->sk_type
) {
1824 chan
->chan_type
= L2CAP_CHAN_RAW
;
1827 chan
->chan_type
= L2CAP_CHAN_CONN_LESS
;
1828 bt_sk(sk
)->skb_msg_name
= l2cap_skb_msg_name
;
1830 case SOCK_SEQPACKET
:
1832 chan
->chan_type
= L2CAP_CHAN_CONN_ORIENTED
;
1836 chan
->imtu
= L2CAP_DEFAULT_MTU
;
1838 if (!disable_ertm
&& sk
->sk_type
== SOCK_STREAM
) {
1839 chan
->mode
= L2CAP_MODE_ERTM
;
1840 set_bit(CONF_STATE2_DEVICE
, &chan
->conf_state
);
1842 chan
->mode
= L2CAP_MODE_BASIC
;
1845 l2cap_chan_set_defaults(chan
);
1848 /* Default config options */
1849 chan
->flush_to
= L2CAP_DEFAULT_FLUSH_TO
;
1852 chan
->ops
= &l2cap_chan_ops
;
1854 l2cap_publish_rx_avail(chan
);
1857 static struct proto l2cap_proto
= {
1859 .owner
= THIS_MODULE
,
1860 .obj_size
= sizeof(struct l2cap_pinfo
)
1863 static struct sock
*l2cap_sock_alloc(struct net
*net
, struct socket
*sock
,
1864 int proto
, gfp_t prio
, int kern
)
1867 struct l2cap_chan
*chan
;
1869 sk
= bt_sock_alloc(net
, sock
, &l2cap_proto
, proto
, prio
, kern
);
1873 sk
->sk_destruct
= l2cap_sock_destruct
;
1874 sk
->sk_sndtimeo
= L2CAP_CONN_TIMEOUT
;
1876 INIT_LIST_HEAD(&l2cap_pi(sk
)->rx_busy
);
1878 chan
= l2cap_chan_create();
1884 l2cap_chan_hold(chan
);
1886 l2cap_pi(sk
)->chan
= chan
;
1891 static int l2cap_sock_create(struct net
*net
, struct socket
*sock
, int protocol
,
1896 BT_DBG("sock %p", sock
);
1898 sock
->state
= SS_UNCONNECTED
;
1900 if (sock
->type
!= SOCK_SEQPACKET
&& sock
->type
!= SOCK_STREAM
&&
1901 sock
->type
!= SOCK_DGRAM
&& sock
->type
!= SOCK_RAW
)
1902 return -ESOCKTNOSUPPORT
;
1904 if (sock
->type
== SOCK_RAW
&& !kern
&& !capable(CAP_NET_RAW
))
1907 sock
->ops
= &l2cap_sock_ops
;
1909 sk
= l2cap_sock_alloc(net
, sock
, protocol
, GFP_ATOMIC
, kern
);
1913 l2cap_sock_init(sk
, NULL
);
1914 bt_sock_link(&l2cap_sk_list
, sk
);
1918 static const struct proto_ops l2cap_sock_ops
= {
1919 .family
= PF_BLUETOOTH
,
1920 .owner
= THIS_MODULE
,
1921 .release
= l2cap_sock_release
,
1922 .bind
= l2cap_sock_bind
,
1923 .connect
= l2cap_sock_connect
,
1924 .listen
= l2cap_sock_listen
,
1925 .accept
= l2cap_sock_accept
,
1926 .getname
= l2cap_sock_getname
,
1927 .sendmsg
= l2cap_sock_sendmsg
,
1928 .recvmsg
= l2cap_sock_recvmsg
,
1929 .poll
= bt_sock_poll
,
1930 .ioctl
= bt_sock_ioctl
,
1931 .gettstamp
= sock_gettstamp
,
1932 .mmap
= sock_no_mmap
,
1933 .socketpair
= sock_no_socketpair
,
1934 .shutdown
= l2cap_sock_shutdown
,
1935 .setsockopt
= l2cap_sock_setsockopt
,
1936 .getsockopt
= l2cap_sock_getsockopt
1939 static const struct net_proto_family l2cap_sock_family_ops
= {
1940 .family
= PF_BLUETOOTH
,
1941 .owner
= THIS_MODULE
,
1942 .create
= l2cap_sock_create
,
1945 int __init
l2cap_init_sockets(void)
1949 BUILD_BUG_ON(sizeof(struct sockaddr_l2
) > sizeof(struct sockaddr
));
1951 err
= proto_register(&l2cap_proto
, 0);
1955 err
= bt_sock_register(BTPROTO_L2CAP
, &l2cap_sock_family_ops
);
1957 BT_ERR("L2CAP socket registration failed");
1961 err
= bt_procfs_init(&init_net
, "l2cap", &l2cap_sk_list
,
1964 BT_ERR("Failed to create L2CAP proc file");
1965 bt_sock_unregister(BTPROTO_L2CAP
);
1969 BT_INFO("L2CAP socket layer initialized");
1974 proto_unregister(&l2cap_proto
);
1978 void l2cap_cleanup_sockets(void)
1980 bt_procfs_cleanup(&init_net
, "l2cap");
1981 bt_sock_unregister(BTPROTO_L2CAP
);
1982 proto_unregister(&l2cap_proto
);