2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
25 /* Bluetooth SCO sockets. */
27 #include <linux/module.h>
28 #include <linux/debugfs.h>
29 #include <linux/seq_file.h>
31 #include <net/bluetooth/bluetooth.h>
32 #include <net/bluetooth/hci_core.h>
33 #include <net/bluetooth/sco.h>
35 static bool disable_esco;
37 static const struct proto_ops sco_sock_ops;
39 static struct bt_sock_list sco_sk_list = {
40 .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
43 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent);
44 static void sco_chan_del(struct sock *sk, int err);
46 static void sco_sock_close(struct sock *sk);
47 static void sco_sock_kill(struct sock *sk);
49 /* ---- SCO timers ---- */
50 static void sco_sock_timeout(unsigned long arg)
52 struct sock *sk = (struct sock *) arg;
54 BT_DBG("sock %p state %d", sk, sk->sk_state);
57 sk->sk_err = ETIMEDOUT;
58 sk->sk_state_change(sk);
65 static void sco_sock_set_timer(struct sock *sk, long timeout)
67 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
68 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
71 static void sco_sock_clear_timer(struct sock *sk)
73 BT_DBG("sock %p state %d", sk, sk->sk_state);
74 sk_stop_timer(sk, &sk->sk_timer);
77 /* ---- SCO connections ---- */
78 static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
80 struct hci_dev *hdev = hcon->hdev;
81 struct sco_conn *conn = hcon->sco_data;
86 conn = kzalloc(sizeof(struct sco_conn), GFP_ATOMIC);
90 spin_lock_init(&conn->lock);
92 hcon->sco_data = conn;
95 conn->src = &hdev->bdaddr;
96 conn->dst = &hcon->dst;
98 if (hdev->sco_mtu > 0)
99 conn->mtu = hdev->sco_mtu;
103 BT_DBG("hcon %p conn %p", hcon, conn);
108 static struct sock *sco_chan_get(struct sco_conn *conn)
110 struct sock *sk = NULL;
113 sco_conn_unlock(conn);
117 static int sco_conn_del(struct hci_conn *hcon, int err)
119 struct sco_conn *conn = hcon->sco_data;
125 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
128 sk = sco_chan_get(conn);
131 sco_sock_clear_timer(sk);
132 sco_chan_del(sk, err);
137 hcon->sco_data = NULL;
142 static int sco_chan_add(struct sco_conn *conn, struct sock *sk,
151 __sco_chan_add(conn, sk, parent);
153 sco_conn_unlock(conn);
157 static int sco_connect(struct sock *sk)
159 bdaddr_t *src = &bt_sk(sk)->src;
160 bdaddr_t *dst = &bt_sk(sk)->dst;
161 struct sco_conn *conn;
162 struct hci_conn *hcon;
163 struct hci_dev *hdev;
166 BT_DBG("%pMR -> %pMR", src, dst);
168 hdev = hci_get_route(dst, src);
170 return -EHOSTUNREACH;
174 if (lmp_esco_capable(hdev) && !disable_esco)
179 hcon = hci_connect(hdev, type, dst, BDADDR_BREDR, BT_SECURITY_LOW,
186 conn = sco_conn_add(hcon);
193 /* Update source addr of the socket */
194 bacpy(src, conn->src);
196 err = sco_chan_add(conn, sk, NULL);
200 if (hcon->state == BT_CONNECTED) {
201 sco_sock_clear_timer(sk);
202 sk->sk_state = BT_CONNECTED;
204 sk->sk_state = BT_CONNECT;
205 sco_sock_set_timer(sk, sk->sk_sndtimeo);
209 hci_dev_unlock(hdev);
214 static int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
216 struct sco_conn *conn = sco_pi(sk)->conn;
220 /* Check outgoing MTU */
224 BT_DBG("sk %p len %d", sk, len);
226 skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
230 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
235 hci_send_sco(conn->hcon, skb);
240 static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
242 struct sock *sk = sco_chan_get(conn);
247 BT_DBG("sk %p len %d", sk, skb->len);
249 if (sk->sk_state != BT_CONNECTED)
252 if (!sock_queue_rcv_skb(sk, skb))
259 /* -------- Socket interface ---------- */
260 static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba)
264 sk_for_each(sk, &sco_sk_list.head) {
265 if (sk->sk_state != BT_LISTEN)
268 if (!bacmp(&bt_sk(sk)->src, ba))
275 /* Find socket listening on source bdaddr.
276 * Returns closest match.
278 static struct sock *sco_get_sock_listen(bdaddr_t *src)
280 struct sock *sk = NULL, *sk1 = NULL;
282 read_lock(&sco_sk_list.lock);
284 sk_for_each(sk, &sco_sk_list.head) {
285 if (sk->sk_state != BT_LISTEN)
289 if (!bacmp(&bt_sk(sk)->src, src))
293 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
297 read_unlock(&sco_sk_list.lock);
299 return sk ? sk : sk1;
302 static void sco_sock_destruct(struct sock *sk)
306 skb_queue_purge(&sk->sk_receive_queue);
307 skb_queue_purge(&sk->sk_write_queue);
310 static void sco_sock_cleanup_listen(struct sock *parent)
314 BT_DBG("parent %p", parent);
316 /* Close not yet accepted channels */
317 while ((sk = bt_accept_dequeue(parent, NULL))) {
322 parent->sk_state = BT_CLOSED;
323 sock_set_flag(parent, SOCK_ZAPPED);
326 /* Kill socket (only if zapped and orphan)
327 * Must be called on unlocked socket.
329 static void sco_sock_kill(struct sock *sk)
331 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
334 BT_DBG("sk %p state %d", sk, sk->sk_state);
336 /* Kill poor orphan */
337 bt_sock_unlink(&sco_sk_list, sk);
338 sock_set_flag(sk, SOCK_DEAD);
342 static void __sco_sock_close(struct sock *sk)
344 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
346 switch (sk->sk_state) {
348 sco_sock_cleanup_listen(sk);
353 if (sco_pi(sk)->conn->hcon) {
354 sk->sk_state = BT_DISCONN;
355 sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
356 hci_conn_put(sco_pi(sk)->conn->hcon);
357 sco_pi(sk)->conn->hcon = NULL;
359 sco_chan_del(sk, ECONNRESET);
365 sco_chan_del(sk, ECONNRESET);
369 sock_set_flag(sk, SOCK_ZAPPED);
374 /* Must be called on unlocked socket. */
375 static void sco_sock_close(struct sock *sk)
377 sco_sock_clear_timer(sk);
379 __sco_sock_close(sk);
384 static void sco_sock_init(struct sock *sk, struct sock *parent)
389 sk->sk_type = parent->sk_type;
390 bt_sk(sk)->flags = bt_sk(parent)->flags;
391 security_sk_clone(parent, sk);
395 static struct proto sco_proto = {
397 .owner = THIS_MODULE,
398 .obj_size = sizeof(struct sco_pinfo)
401 static struct sock *sco_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
405 sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto);
409 sock_init_data(sock, sk);
410 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
412 sk->sk_destruct = sco_sock_destruct;
413 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
415 sock_reset_flag(sk, SOCK_ZAPPED);
417 sk->sk_protocol = proto;
418 sk->sk_state = BT_OPEN;
420 setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);
422 bt_sock_link(&sco_sk_list, sk);
426 static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
431 BT_DBG("sock %p", sock);
433 sock->state = SS_UNCONNECTED;
435 if (sock->type != SOCK_SEQPACKET)
436 return -ESOCKTNOSUPPORT;
438 sock->ops = &sco_sock_ops;
440 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC);
444 sco_sock_init(sk, NULL);
448 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
450 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
451 struct sock *sk = sock->sk;
454 BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
456 if (!addr || addr->sa_family != AF_BLUETOOTH)
461 if (sk->sk_state != BT_OPEN) {
466 if (sk->sk_type != SOCK_SEQPACKET) {
471 bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
473 sk->sk_state = BT_BOUND;
480 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
482 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
483 struct sock *sk = sock->sk;
489 if (alen < sizeof(struct sockaddr_sco) ||
490 addr->sa_family != AF_BLUETOOTH)
493 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
496 if (sk->sk_type != SOCK_SEQPACKET)
501 /* Set destination address and psm */
502 bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
504 err = sco_connect(sk);
508 err = bt_sock_wait_state(sk, BT_CONNECTED,
509 sock_sndtimeo(sk, flags & O_NONBLOCK));
516 static int sco_sock_listen(struct socket *sock, int backlog)
518 struct sock *sk = sock->sk;
519 bdaddr_t *src = &bt_sk(sk)->src;
522 BT_DBG("sk %p backlog %d", sk, backlog);
526 if (sk->sk_state != BT_BOUND) {
531 if (sk->sk_type != SOCK_SEQPACKET) {
536 write_lock(&sco_sk_list.lock);
538 if (__sco_get_sock_listen_by_addr(src)) {
543 sk->sk_max_ack_backlog = backlog;
544 sk->sk_ack_backlog = 0;
546 sk->sk_state = BT_LISTEN;
549 write_unlock(&sco_sk_list.lock);
556 static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
558 DECLARE_WAITQUEUE(wait, current);
559 struct sock *sk = sock->sk, *ch;
565 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
567 BT_DBG("sk %p timeo %ld", sk, timeo);
569 /* Wait for an incoming connection. (wake-one). */
570 add_wait_queue_exclusive(sk_sleep(sk), &wait);
572 set_current_state(TASK_INTERRUPTIBLE);
574 if (sk->sk_state != BT_LISTEN) {
579 ch = bt_accept_dequeue(sk, newsock);
588 if (signal_pending(current)) {
589 err = sock_intr_errno(timeo);
594 timeo = schedule_timeout(timeo);
597 __set_current_state(TASK_RUNNING);
598 remove_wait_queue(sk_sleep(sk), &wait);
603 newsock->state = SS_CONNECTED;
605 BT_DBG("new socket %p", ch);
612 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
614 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
615 struct sock *sk = sock->sk;
617 BT_DBG("sock %p, sk %p", sock, sk);
619 addr->sa_family = AF_BLUETOOTH;
620 *len = sizeof(struct sockaddr_sco);
623 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
625 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
630 static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
631 struct msghdr *msg, size_t len)
633 struct sock *sk = sock->sk;
636 BT_DBG("sock %p, sk %p", sock, sk);
638 err = sock_error(sk);
642 if (msg->msg_flags & MSG_OOB)
647 if (sk->sk_state == BT_CONNECTED)
648 err = sco_send_frame(sk, msg, len);
656 static int sco_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
657 struct msghdr *msg, size_t len, int flags)
659 struct sock *sk = sock->sk;
660 struct sco_pinfo *pi = sco_pi(sk);
664 if (sk->sk_state == BT_CONNECT2 &&
665 test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
666 hci_conn_accept(pi->conn->hcon, 0);
667 sk->sk_state = BT_CONFIG;
675 return bt_sock_recvmsg(iocb, sock, msg, len, flags);
678 static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
680 struct sock *sk = sock->sk;
691 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
696 if (get_user(opt, (u32 __user *) optval)) {
702 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
704 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
716 static int sco_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
718 struct sock *sk = sock->sk;
719 struct sco_options opts;
720 struct sco_conninfo cinfo;
725 if (get_user(len, optlen))
732 if (sk->sk_state != BT_CONNECTED) {
737 opts.mtu = sco_pi(sk)->conn->mtu;
739 BT_DBG("mtu %d", opts.mtu);
741 len = min_t(unsigned int, len, sizeof(opts));
742 if (copy_to_user(optval, (char *)&opts, len))
748 if (sk->sk_state != BT_CONNECTED) {
753 memset(&cinfo, 0, sizeof(cinfo));
754 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
755 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
757 len = min_t(unsigned int, len, sizeof(cinfo));
758 if (copy_to_user(optval, (char *)&cinfo, len))
772 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
774 struct sock *sk = sock->sk;
779 if (level == SOL_SCO)
780 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
782 if (get_user(len, optlen))
790 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
795 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
796 (u32 __user *) optval))
810 static int sco_sock_shutdown(struct socket *sock, int how)
812 struct sock *sk = sock->sk;
815 BT_DBG("sock %p, sk %p", sock, sk);
821 if (!sk->sk_shutdown) {
822 sk->sk_shutdown = SHUTDOWN_MASK;
823 sco_sock_clear_timer(sk);
824 __sco_sock_close(sk);
826 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
827 err = bt_sock_wait_state(sk, BT_CLOSED,
834 static int sco_sock_release(struct socket *sock)
836 struct sock *sk = sock->sk;
839 BT_DBG("sock %p, sk %p", sock, sk);
846 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
848 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
857 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
859 BT_DBG("conn %p", conn);
861 sco_pi(sk)->conn = conn;
865 bt_accept_enqueue(parent, sk);
869 * Must be called on the locked socket. */
870 static void sco_chan_del(struct sock *sk, int err)
872 struct sco_conn *conn;
874 conn = sco_pi(sk)->conn;
876 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
881 sco_pi(sk)->conn = NULL;
882 sco_conn_unlock(conn);
885 hci_conn_put(conn->hcon);
888 sk->sk_state = BT_CLOSED;
890 sk->sk_state_change(sk);
892 sock_set_flag(sk, SOCK_ZAPPED);
895 static void sco_conn_ready(struct sco_conn *conn)
898 struct sock *sk = conn->sk;
900 BT_DBG("conn %p", conn);
903 sco_sock_clear_timer(sk);
905 sk->sk_state = BT_CONNECTED;
906 sk->sk_state_change(sk);
911 parent = sco_get_sock_listen(conn->src);
913 sco_conn_unlock(conn);
917 bh_lock_sock(parent);
919 sk = sco_sock_alloc(sock_net(parent), NULL,
920 BTPROTO_SCO, GFP_ATOMIC);
922 bh_unlock_sock(parent);
923 sco_conn_unlock(conn);
927 sco_sock_init(sk, parent);
929 bacpy(&bt_sk(sk)->src, conn->src);
930 bacpy(&bt_sk(sk)->dst, conn->dst);
932 hci_conn_hold(conn->hcon);
933 __sco_chan_add(conn, sk, parent);
935 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
936 sk->sk_state = BT_CONNECT2;
938 sk->sk_state = BT_CONNECTED;
941 parent->sk_data_ready(parent, 1);
943 bh_unlock_sock(parent);
945 sco_conn_unlock(conn);
949 /* ----- SCO interface with lower layer (HCI) ----- */
950 int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
955 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
957 /* Find listening sockets */
958 read_lock(&sco_sk_list.lock);
959 sk_for_each(sk, &sco_sk_list.head) {
960 if (sk->sk_state != BT_LISTEN)
963 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr) ||
964 !bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
967 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
968 *flags |= HCI_PROTO_DEFER;
972 read_unlock(&sco_sk_list.lock);
977 void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
979 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
981 struct sco_conn *conn;
983 conn = sco_conn_add(hcon);
985 sco_conn_ready(conn);
987 sco_conn_del(hcon, bt_to_errno(status));
990 void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
992 BT_DBG("hcon %p reason %d", hcon, reason);
994 sco_conn_del(hcon, bt_to_errno(reason));
997 int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
999 struct sco_conn *conn = hcon->sco_data;
1004 BT_DBG("conn %p len %d", conn, skb->len);
1007 sco_recv_frame(conn, skb);
1016 static int sco_debugfs_show(struct seq_file *f, void *p)
1020 read_lock(&sco_sk_list.lock);
1022 sk_for_each(sk, &sco_sk_list.head) {
1023 seq_printf(f, "%pMR %pMR %d\n", &bt_sk(sk)->src,
1024 &bt_sk(sk)->dst, sk->sk_state);
1027 read_unlock(&sco_sk_list.lock);
1032 static int sco_debugfs_open(struct inode *inode, struct file *file)
1034 return single_open(file, sco_debugfs_show, inode->i_private);
1037 static const struct file_operations sco_debugfs_fops = {
1038 .open = sco_debugfs_open,
1040 .llseek = seq_lseek,
1041 .release = single_release,
1044 static struct dentry *sco_debugfs;
1046 static const struct proto_ops sco_sock_ops = {
1047 .family = PF_BLUETOOTH,
1048 .owner = THIS_MODULE,
1049 .release = sco_sock_release,
1050 .bind = sco_sock_bind,
1051 .connect = sco_sock_connect,
1052 .listen = sco_sock_listen,
1053 .accept = sco_sock_accept,
1054 .getname = sco_sock_getname,
1055 .sendmsg = sco_sock_sendmsg,
1056 .recvmsg = sco_sock_recvmsg,
1057 .poll = bt_sock_poll,
1058 .ioctl = bt_sock_ioctl,
1059 .mmap = sock_no_mmap,
1060 .socketpair = sock_no_socketpair,
1061 .shutdown = sco_sock_shutdown,
1062 .setsockopt = sco_sock_setsockopt,
1063 .getsockopt = sco_sock_getsockopt
1066 static const struct net_proto_family sco_sock_family_ops = {
1067 .family = PF_BLUETOOTH,
1068 .owner = THIS_MODULE,
1069 .create = sco_sock_create,
1072 int __init sco_init(void)
1076 err = proto_register(&sco_proto, 0);
1080 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1082 BT_ERR("SCO socket registration failed");
1086 err = bt_procfs_init(THIS_MODULE, &init_net, "sco", &sco_sk_list, NULL);
1088 BT_ERR("Failed to create SCO proc file");
1089 bt_sock_unregister(BTPROTO_SCO);
1094 sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
1095 NULL, &sco_debugfs_fops);
1097 BT_ERR("Failed to create SCO debug file");
1100 BT_INFO("SCO socket layer initialized");
1105 proto_unregister(&sco_proto);
1109 void __exit sco_exit(void)
1111 bt_procfs_cleanup(&init_net, "sco");
1113 debugfs_remove(sco_debugfs);
1115 if (bt_sock_unregister(BTPROTO_SCO) < 0)
1116 BT_ERR("SCO socket unregistration failed");
1118 proto_unregister(&sco_proto);
1121 module_param(disable_esco, bool, 0644);
1122 MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");