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>
29 #include <linux/types.h>
30 #include <linux/errno.h>
31 #include <linux/kernel.h>
32 #include <linux/sched.h>
33 #include <linux/slab.h>
34 #include <linux/poll.h>
35 #include <linux/fcntl.h>
36 #include <linux/init.h>
37 #include <linux/interrupt.h>
38 #include <linux/socket.h>
39 #include <linux/skbuff.h>
40 #include <linux/device.h>
41 #include <linux/list.h>
44 #include <asm/system.h>
45 #include <asm/uaccess.h>
47 #include <net/bluetooth/bluetooth.h>
48 #include <net/bluetooth/hci_core.h>
49 #include <net/bluetooth/sco.h>
51 #ifndef CONFIG_BT_SCO_DEBUG
58 static int disable_esco = 0;
60 static const struct proto_ops sco_sock_ops;
62 static struct bt_sock_list sco_sk_list = {
63 .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
66 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent);
67 static void sco_chan_del(struct sock *sk, int err);
69 static int sco_conn_del(struct hci_conn *conn, int err);
71 static void sco_sock_close(struct sock *sk);
72 static void sco_sock_kill(struct sock *sk);
74 /* ---- SCO timers ---- */
75 static void sco_sock_timeout(unsigned long arg)
77 struct sock *sk = (struct sock *) arg;
79 BT_DBG("sock %p state %d", sk, sk->sk_state);
82 sk->sk_err = ETIMEDOUT;
83 sk->sk_state_change(sk);
90 static void sco_sock_set_timer(struct sock *sk, long timeout)
92 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
93 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
96 static void sco_sock_clear_timer(struct sock *sk)
98 BT_DBG("sock %p state %d", sk, sk->sk_state);
99 sk_stop_timer(sk, &sk->sk_timer);
102 /* ---- SCO connections ---- */
103 static struct sco_conn *sco_conn_add(struct hci_conn *hcon, __u8 status)
105 struct hci_dev *hdev = hcon->hdev;
106 struct sco_conn *conn = hcon->sco_data;
111 conn = kzalloc(sizeof(struct sco_conn), GFP_ATOMIC);
115 spin_lock_init(&conn->lock);
117 hcon->sco_data = conn;
120 conn->src = &hdev->bdaddr;
121 conn->dst = &hcon->dst;
123 if (hdev->sco_mtu > 0)
124 conn->mtu = hdev->sco_mtu;
128 BT_DBG("hcon %p conn %p", hcon, conn);
133 static inline struct sock *sco_chan_get(struct sco_conn *conn)
135 struct sock *sk = NULL;
138 sco_conn_unlock(conn);
142 static int sco_conn_del(struct hci_conn *hcon, int err)
144 struct sco_conn *conn;
147 if (!(conn = hcon->sco_data))
150 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
153 if ((sk = sco_chan_get(conn))) {
155 sco_sock_clear_timer(sk);
156 sco_chan_del(sk, err);
161 hcon->sco_data = NULL;
166 static inline int sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
174 __sco_chan_add(conn, sk, parent);
176 sco_conn_unlock(conn);
180 static int sco_connect(struct sock *sk)
182 bdaddr_t *src = &bt_sk(sk)->src;
183 bdaddr_t *dst = &bt_sk(sk)->dst;
184 struct sco_conn *conn;
185 struct hci_conn *hcon;
186 struct hci_dev *hdev;
189 BT_DBG("%s -> %s", batostr(src), batostr(dst));
191 if (!(hdev = hci_get_route(dst, src)))
192 return -EHOSTUNREACH;
194 hci_dev_lock_bh(hdev);
198 if (lmp_esco_capable(hdev) && !disable_esco)
203 hcon = hci_connect(hdev, type, dst);
207 conn = sco_conn_add(hcon, 0);
213 /* Update source addr of the socket */
214 bacpy(src, conn->src);
216 err = sco_chan_add(conn, sk, NULL);
220 if (hcon->state == BT_CONNECTED) {
221 sco_sock_clear_timer(sk);
222 sk->sk_state = BT_CONNECTED;
224 sk->sk_state = BT_CONNECT;
225 sco_sock_set_timer(sk, sk->sk_sndtimeo);
229 hci_dev_unlock_bh(hdev);
234 static inline int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
236 struct sco_conn *conn = sco_pi(sk)->conn;
240 /* Check outgoing MTU */
244 BT_DBG("sk %p len %d", sk, len);
246 count = min_t(unsigned int, conn->mtu, len);
247 if (!(skb = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err)))
250 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
255 if ((err = hci_send_sco(conn->hcon, skb)) < 0)
265 static inline void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
267 struct sock *sk = sco_chan_get(conn);
272 BT_DBG("sk %p len %d", sk, skb->len);
274 if (sk->sk_state != BT_CONNECTED)
277 if (!sock_queue_rcv_skb(sk, skb))
285 /* -------- Socket interface ---------- */
286 static struct sock *__sco_get_sock_by_addr(bdaddr_t *ba)
289 struct hlist_node *node;
291 sk_for_each(sk, node, &sco_sk_list.head)
292 if (!bacmp(&bt_sk(sk)->src, ba))
299 /* Find socket listening on source bdaddr.
300 * Returns closest match.
302 static struct sock *sco_get_sock_listen(bdaddr_t *src)
304 struct sock *sk = NULL, *sk1 = NULL;
305 struct hlist_node *node;
307 read_lock(&sco_sk_list.lock);
309 sk_for_each(sk, node, &sco_sk_list.head) {
310 if (sk->sk_state != BT_LISTEN)
314 if (!bacmp(&bt_sk(sk)->src, src))
318 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
322 read_unlock(&sco_sk_list.lock);
324 return node ? sk : sk1;
327 static void sco_sock_destruct(struct sock *sk)
331 skb_queue_purge(&sk->sk_receive_queue);
332 skb_queue_purge(&sk->sk_write_queue);
335 static void sco_sock_cleanup_listen(struct sock *parent)
339 BT_DBG("parent %p", parent);
341 /* Close not yet accepted channels */
342 while ((sk = bt_accept_dequeue(parent, NULL))) {
347 parent->sk_state = BT_CLOSED;
348 sock_set_flag(parent, SOCK_ZAPPED);
351 /* Kill socket (only if zapped and orphan)
352 * Must be called on unlocked socket.
354 static void sco_sock_kill(struct sock *sk)
356 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
359 BT_DBG("sk %p state %d", sk, sk->sk_state);
361 /* Kill poor orphan */
362 bt_sock_unlink(&sco_sk_list, sk);
363 sock_set_flag(sk, SOCK_DEAD);
368 * Must be called on unlocked socket.
370 static void sco_sock_close(struct sock *sk)
372 struct sco_conn *conn;
374 sco_sock_clear_timer(sk);
378 conn = sco_pi(sk)->conn;
380 BT_DBG("sk %p state %d conn %p socket %p", sk, sk->sk_state, conn, sk->sk_socket);
382 switch (sk->sk_state) {
384 sco_sock_cleanup_listen(sk);
391 sco_chan_del(sk, ECONNRESET);
395 sock_set_flag(sk, SOCK_ZAPPED);
404 static void sco_sock_init(struct sock *sk, struct sock *parent)
409 sk->sk_type = parent->sk_type;
412 static struct proto sco_proto = {
414 .owner = THIS_MODULE,
415 .obj_size = sizeof(struct sco_pinfo)
418 static struct sock *sco_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
422 sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto);
426 sock_init_data(sock, sk);
427 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
429 sk->sk_destruct = sco_sock_destruct;
430 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
432 sock_reset_flag(sk, SOCK_ZAPPED);
434 sk->sk_protocol = proto;
435 sk->sk_state = BT_OPEN;
437 setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);
439 bt_sock_link(&sco_sk_list, sk);
443 static int sco_sock_create(struct net *net, struct socket *sock, int protocol)
447 BT_DBG("sock %p", sock);
449 sock->state = SS_UNCONNECTED;
451 if (sock->type != SOCK_SEQPACKET)
452 return -ESOCKTNOSUPPORT;
454 sock->ops = &sco_sock_ops;
456 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC);
460 sco_sock_init(sk, NULL);
464 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
466 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
467 struct sock *sk = sock->sk;
468 bdaddr_t *src = &sa->sco_bdaddr;
471 BT_DBG("sk %p %s", sk, batostr(&sa->sco_bdaddr));
473 if (!addr || addr->sa_family != AF_BLUETOOTH)
478 if (sk->sk_state != BT_OPEN) {
483 write_lock_bh(&sco_sk_list.lock);
485 if (bacmp(src, BDADDR_ANY) && __sco_get_sock_by_addr(src)) {
488 /* Save source address */
489 bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
490 sk->sk_state = BT_BOUND;
493 write_unlock_bh(&sco_sk_list.lock);
500 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
502 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
503 struct sock *sk = sock->sk;
509 if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_sco))
512 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
515 if (sk->sk_type != SOCK_SEQPACKET)
520 /* Set destination address and psm */
521 bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
523 if ((err = sco_connect(sk)))
526 err = bt_sock_wait_state(sk, BT_CONNECTED,
527 sock_sndtimeo(sk, flags & O_NONBLOCK));
534 static int sco_sock_listen(struct socket *sock, int backlog)
536 struct sock *sk = sock->sk;
539 BT_DBG("sk %p backlog %d", sk, backlog);
543 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
548 sk->sk_max_ack_backlog = backlog;
549 sk->sk_ack_backlog = 0;
550 sk->sk_state = BT_LISTEN;
557 static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
559 DECLARE_WAITQUEUE(wait, current);
560 struct sock *sk = sock->sk, *ch;
566 if (sk->sk_state != BT_LISTEN) {
571 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
573 BT_DBG("sk %p timeo %ld", sk, timeo);
575 /* Wait for an incoming connection. (wake-one). */
576 add_wait_queue_exclusive(sk->sk_sleep, &wait);
577 while (!(ch = bt_accept_dequeue(sk, newsock))) {
578 set_current_state(TASK_INTERRUPTIBLE);
585 timeo = schedule_timeout(timeo);
588 if (sk->sk_state != BT_LISTEN) {
593 if (signal_pending(current)) {
594 err = sock_intr_errno(timeo);
598 set_current_state(TASK_RUNNING);
599 remove_wait_queue(sk->sk_sleep, &wait);
604 newsock->state = SS_CONNECTED;
606 BT_DBG("new socket %p", ch);
613 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
615 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
616 struct sock *sk = sock->sk;
618 BT_DBG("sock %p, sk %p", sock, sk);
620 addr->sa_family = AF_BLUETOOTH;
621 *len = sizeof(struct sockaddr_sco);
624 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
626 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
631 static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
632 struct msghdr *msg, size_t len)
634 struct sock *sk = sock->sk;
637 BT_DBG("sock %p, sk %p", sock, sk);
639 err = sock_error(sk);
643 if (msg->msg_flags & MSG_OOB)
648 if (sk->sk_state == BT_CONNECTED)
649 err = sco_send_frame(sk, msg, len);
657 static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
659 struct sock *sk = sock->sk;
676 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
678 struct sock *sk = sock->sk;
679 struct sco_options opts;
680 struct sco_conninfo cinfo;
685 if (get_user(len, optlen))
692 if (sk->sk_state != BT_CONNECTED) {
697 opts.mtu = sco_pi(sk)->conn->mtu;
699 BT_DBG("mtu %d", opts.mtu);
701 len = min_t(unsigned int, len, sizeof(opts));
702 if (copy_to_user(optval, (char *)&opts, len))
708 if (sk->sk_state != BT_CONNECTED) {
713 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
714 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
716 len = min_t(unsigned int, len, sizeof(cinfo));
717 if (copy_to_user(optval, (char *)&cinfo, len))
731 static int sco_sock_release(struct socket *sock)
733 struct sock *sk = sock->sk;
736 BT_DBG("sock %p, sk %p", sock, sk);
743 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
745 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
754 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
756 BT_DBG("conn %p", conn);
758 sco_pi(sk)->conn = conn;
762 bt_accept_enqueue(parent, sk);
766 * Must be called on the locked socket. */
767 static void sco_chan_del(struct sock *sk, int err)
769 struct sco_conn *conn;
771 conn = sco_pi(sk)->conn;
773 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
778 sco_pi(sk)->conn = NULL;
779 sco_conn_unlock(conn);
780 hci_conn_put(conn->hcon);
783 sk->sk_state = BT_CLOSED;
785 sk->sk_state_change(sk);
787 sock_set_flag(sk, SOCK_ZAPPED);
790 static void sco_conn_ready(struct sco_conn *conn)
792 struct sock *parent, *sk;
794 BT_DBG("conn %p", conn);
798 if ((sk = conn->sk)) {
799 sco_sock_clear_timer(sk);
801 sk->sk_state = BT_CONNECTED;
802 sk->sk_state_change(sk);
805 parent = sco_get_sock_listen(conn->src);
809 bh_lock_sock(parent);
811 sk = sco_sock_alloc(sock_net(parent), NULL, BTPROTO_SCO, GFP_ATOMIC);
813 bh_unlock_sock(parent);
817 sco_sock_init(sk, parent);
819 bacpy(&bt_sk(sk)->src, conn->src);
820 bacpy(&bt_sk(sk)->dst, conn->dst);
822 hci_conn_hold(conn->hcon);
823 __sco_chan_add(conn, sk, parent);
825 sk->sk_state = BT_CONNECTED;
828 parent->sk_data_ready(parent, 1);
830 bh_unlock_sock(parent);
834 sco_conn_unlock(conn);
837 /* ----- SCO interface with lower layer (HCI) ----- */
838 static int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type)
840 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
842 /* Always accept connection */
843 return HCI_LM_ACCEPT;
846 static int sco_connect_cfm(struct hci_conn *hcon, __u8 status)
848 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
850 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
854 struct sco_conn *conn;
856 conn = sco_conn_add(hcon, status);
858 sco_conn_ready(conn);
860 sco_conn_del(hcon, bt_err(status));
865 static int sco_disconn_ind(struct hci_conn *hcon, __u8 reason)
867 BT_DBG("hcon %p reason %d", hcon, reason);
869 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
872 sco_conn_del(hcon, bt_err(reason));
877 static int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
879 struct sco_conn *conn = hcon->sco_data;
884 BT_DBG("conn %p len %d", conn, skb->len);
887 sco_recv_frame(conn, skb);
896 static ssize_t sco_sysfs_show(struct class *dev, char *buf)
899 struct hlist_node *node;
902 read_lock_bh(&sco_sk_list.lock);
904 sk_for_each(sk, node, &sco_sk_list.head) {
905 str += sprintf(str, "%s %s %d\n",
906 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
910 read_unlock_bh(&sco_sk_list.lock);
915 static CLASS_ATTR(sco, S_IRUGO, sco_sysfs_show, NULL);
917 static const struct proto_ops sco_sock_ops = {
918 .family = PF_BLUETOOTH,
919 .owner = THIS_MODULE,
920 .release = sco_sock_release,
921 .bind = sco_sock_bind,
922 .connect = sco_sock_connect,
923 .listen = sco_sock_listen,
924 .accept = sco_sock_accept,
925 .getname = sco_sock_getname,
926 .sendmsg = sco_sock_sendmsg,
927 .recvmsg = bt_sock_recvmsg,
928 .poll = bt_sock_poll,
929 .ioctl = bt_sock_ioctl,
930 .mmap = sock_no_mmap,
931 .socketpair = sock_no_socketpair,
932 .shutdown = sock_no_shutdown,
933 .setsockopt = sco_sock_setsockopt,
934 .getsockopt = sco_sock_getsockopt
937 static struct net_proto_family sco_sock_family_ops = {
938 .family = PF_BLUETOOTH,
939 .owner = THIS_MODULE,
940 .create = sco_sock_create,
943 static struct hci_proto sco_hci_proto = {
946 .connect_ind = sco_connect_ind,
947 .connect_cfm = sco_connect_cfm,
948 .disconn_ind = sco_disconn_ind,
949 .recv_scodata = sco_recv_scodata
952 static int __init sco_init(void)
956 err = proto_register(&sco_proto, 0);
960 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
962 BT_ERR("SCO socket registration failed");
966 err = hci_register_proto(&sco_hci_proto);
968 BT_ERR("SCO protocol registration failed");
969 bt_sock_unregister(BTPROTO_SCO);
973 if (class_create_file(bt_class, &class_attr_sco) < 0)
974 BT_ERR("Failed to create SCO info file");
976 BT_INFO("SCO (Voice Link) ver %s", VERSION);
977 BT_INFO("SCO socket layer initialized");
982 proto_unregister(&sco_proto);
986 static void __exit sco_exit(void)
988 class_remove_file(bt_class, &class_attr_sco);
990 if (bt_sock_unregister(BTPROTO_SCO) < 0)
991 BT_ERR("SCO socket unregistration failed");
993 if (hci_unregister_proto(&sco_hci_proto) < 0)
994 BT_ERR("SCO protocol unregistration failed");
996 proto_unregister(&sco_proto);
999 module_init(sco_init);
1000 module_exit(sco_exit);
1002 module_param(disable_esco, bool, 0644);
1003 MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");
1005 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1006 MODULE_DESCRIPTION("Bluetooth SCO ver " VERSION);
1007 MODULE_VERSION(VERSION);
1008 MODULE_LICENSE("GPL");
1009 MODULE_ALIAS("bt-proto-2");