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 const struct proto_ops sco_sock_ops;
60 static struct bt_sock_list sco_sk_list = {
61 .lock = RW_LOCK_UNLOCKED
64 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent);
65 static void sco_chan_del(struct sock *sk, int err);
67 static int sco_conn_del(struct hci_conn *conn, int err);
69 static void sco_sock_close(struct sock *sk);
70 static void sco_sock_kill(struct sock *sk);
72 /* ---- SCO timers ---- */
73 static void sco_sock_timeout(unsigned long arg)
75 struct sock *sk = (struct sock *) arg;
77 BT_DBG("sock %p state %d", sk, sk->sk_state);
80 sk->sk_err = ETIMEDOUT;
81 sk->sk_state_change(sk);
88 static void sco_sock_set_timer(struct sock *sk, long timeout)
90 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
91 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
94 static void sco_sock_clear_timer(struct sock *sk)
96 BT_DBG("sock %p state %d", sk, sk->sk_state);
97 sk_stop_timer(sk, &sk->sk_timer);
100 static void sco_sock_init_timer(struct sock *sk)
102 init_timer(&sk->sk_timer);
103 sk->sk_timer.function = sco_sock_timeout;
104 sk->sk_timer.data = (unsigned long)sk;
107 /* ---- SCO connections ---- */
108 static struct sco_conn *sco_conn_add(struct hci_conn *hcon, __u8 status)
110 struct hci_dev *hdev = hcon->hdev;
111 struct sco_conn *conn = hcon->sco_data;
116 conn = kzalloc(sizeof(struct sco_conn), GFP_ATOMIC);
120 spin_lock_init(&conn->lock);
122 hcon->sco_data = conn;
125 conn->src = &hdev->bdaddr;
126 conn->dst = &hcon->dst;
128 if (hdev->sco_mtu > 0)
129 conn->mtu = hdev->sco_mtu;
133 BT_DBG("hcon %p conn %p", hcon, conn);
138 static inline struct sock *sco_chan_get(struct sco_conn *conn)
140 struct sock *sk = NULL;
143 sco_conn_unlock(conn);
147 static int sco_conn_del(struct hci_conn *hcon, int err)
149 struct sco_conn *conn;
152 if (!(conn = hcon->sco_data))
155 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
158 if ((sk = sco_chan_get(conn))) {
160 sco_sock_clear_timer(sk);
161 sco_chan_del(sk, err);
166 hcon->sco_data = NULL;
171 static inline int sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
179 __sco_chan_add(conn, sk, parent);
181 sco_conn_unlock(conn);
185 static int sco_connect(struct sock *sk)
187 bdaddr_t *src = &bt_sk(sk)->src;
188 bdaddr_t *dst = &bt_sk(sk)->dst;
189 struct sco_conn *conn;
190 struct hci_conn *hcon;
191 struct hci_dev *hdev;
194 BT_DBG("%s -> %s", batostr(src), batostr(dst));
196 if (!(hdev = hci_get_route(dst, src)))
197 return -EHOSTUNREACH;
199 hci_dev_lock_bh(hdev);
203 hcon = hci_connect(hdev, SCO_LINK, 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);
228 hci_dev_unlock_bh(hdev);
233 static inline int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
235 struct sco_conn *conn = sco_pi(sk)->conn;
239 /* Check outgoing MTU */
243 BT_DBG("sk %p len %d", sk, len);
245 count = min_t(unsigned int, conn->mtu, len);
246 if (!(skb = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err)))
249 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
254 if ((err = hci_send_sco(conn->hcon, skb)) < 0)
264 static inline void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
266 struct sock *sk = sco_chan_get(conn);
271 BT_DBG("sk %p len %d", sk, skb->len);
273 if (sk->sk_state != BT_CONNECTED)
276 if (!sock_queue_rcv_skb(sk, skb))
284 /* -------- Socket interface ---------- */
285 static struct sock *__sco_get_sock_by_addr(bdaddr_t *ba)
288 struct hlist_node *node;
290 sk_for_each(sk, node, &sco_sk_list.head)
291 if (!bacmp(&bt_sk(sk)->src, ba))
298 /* Find socket listening on source bdaddr.
299 * Returns closest match.
301 static struct sock *sco_get_sock_listen(bdaddr_t *src)
303 struct sock *sk = NULL, *sk1 = NULL;
304 struct hlist_node *node;
306 read_lock(&sco_sk_list.lock);
308 sk_for_each(sk, node, &sco_sk_list.head) {
309 if (sk->sk_state != BT_LISTEN)
313 if (!bacmp(&bt_sk(sk)->src, src))
317 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
321 read_unlock(&sco_sk_list.lock);
323 return node ? sk : sk1;
326 static void sco_sock_destruct(struct sock *sk)
330 skb_queue_purge(&sk->sk_receive_queue);
331 skb_queue_purge(&sk->sk_write_queue);
334 static void sco_sock_cleanup_listen(struct sock *parent)
338 BT_DBG("parent %p", parent);
340 /* Close not yet accepted channels */
341 while ((sk = bt_accept_dequeue(parent, NULL))) {
346 parent->sk_state = BT_CLOSED;
347 sock_set_flag(parent, SOCK_ZAPPED);
350 /* Kill socket (only if zapped and orphan)
351 * Must be called on unlocked socket.
353 static void sco_sock_kill(struct sock *sk)
355 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
358 BT_DBG("sk %p state %d", sk, sk->sk_state);
360 /* Kill poor orphan */
361 bt_sock_unlink(&sco_sk_list, sk);
362 sock_set_flag(sk, SOCK_DEAD);
367 * Must be called on unlocked socket.
369 static void sco_sock_close(struct sock *sk)
371 struct sco_conn *conn;
373 sco_sock_clear_timer(sk);
377 conn = sco_pi(sk)->conn;
379 BT_DBG("sk %p state %d conn %p socket %p", sk, sk->sk_state, conn, sk->sk_socket);
381 switch (sk->sk_state) {
383 sco_sock_cleanup_listen(sk);
390 sco_chan_del(sk, ECONNRESET);
394 sock_set_flag(sk, SOCK_ZAPPED);
403 static void sco_sock_init(struct sock *sk, struct sock *parent)
408 sk->sk_type = parent->sk_type;
411 static struct proto sco_proto = {
413 .owner = THIS_MODULE,
414 .obj_size = sizeof(struct sco_pinfo)
417 static struct sock *sco_sock_alloc(struct socket *sock, int proto, gfp_t prio)
421 sk = sk_alloc(PF_BLUETOOTH, prio, &sco_proto, 1);
425 sock_init_data(sock, sk);
426 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
428 sk->sk_destruct = sco_sock_destruct;
429 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
431 sock_reset_flag(sk, SOCK_ZAPPED);
433 sk->sk_protocol = proto;
434 sk->sk_state = BT_OPEN;
436 sco_sock_init_timer(sk);
438 bt_sock_link(&sco_sk_list, sk);
442 static int sco_sock_create(struct socket *sock, int protocol)
446 BT_DBG("sock %p", sock);
448 sock->state = SS_UNCONNECTED;
450 if (sock->type != SOCK_SEQPACKET)
451 return -ESOCKTNOSUPPORT;
453 sock->ops = &sco_sock_ops;
455 sk = sco_sock_alloc(sock, protocol, GFP_ATOMIC);
459 sco_sock_init(sk, NULL);
463 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
465 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
466 struct sock *sk = sock->sk;
467 bdaddr_t *src = &sa->sco_bdaddr;
470 BT_DBG("sk %p %s", sk, batostr(&sa->sco_bdaddr));
472 if (!addr || addr->sa_family != AF_BLUETOOTH)
477 if (sk->sk_state != BT_OPEN) {
482 write_lock_bh(&sco_sk_list.lock);
484 if (bacmp(src, BDADDR_ANY) && __sco_get_sock_by_addr(src)) {
487 /* Save source address */
488 bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
489 sk->sk_state = BT_BOUND;
492 write_unlock_bh(&sco_sk_list.lock);
499 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
501 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
502 struct sock *sk = sock->sk;
508 if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_sco))
511 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
514 if (sk->sk_type != SOCK_SEQPACKET)
519 /* Set destination address and psm */
520 bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
522 if ((err = sco_connect(sk)))
525 err = bt_sock_wait_state(sk, BT_CONNECTED,
526 sock_sndtimeo(sk, flags & O_NONBLOCK));
533 static int sco_sock_listen(struct socket *sock, int backlog)
535 struct sock *sk = sock->sk;
538 BT_DBG("sk %p backlog %d", sk, backlog);
542 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
547 sk->sk_max_ack_backlog = backlog;
548 sk->sk_ack_backlog = 0;
549 sk->sk_state = BT_LISTEN;
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 if (sk->sk_state != BT_LISTEN) {
570 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
572 BT_DBG("sk %p timeo %ld", sk, timeo);
574 /* Wait for an incoming connection. (wake-one). */
575 add_wait_queue_exclusive(sk->sk_sleep, &wait);
576 while (!(ch = bt_accept_dequeue(sk, newsock))) {
577 set_current_state(TASK_INTERRUPTIBLE);
584 timeo = schedule_timeout(timeo);
587 if (sk->sk_state != BT_LISTEN) {
592 if (signal_pending(current)) {
593 err = sock_intr_errno(timeo);
597 set_current_state(TASK_RUNNING);
598 remove_wait_queue(sk->sk_sleep, &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_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
658 struct sock *sk = sock->sk;
675 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
677 struct sock *sk = sock->sk;
678 struct sco_options opts;
679 struct sco_conninfo cinfo;
684 if (get_user(len, optlen))
691 if (sk->sk_state != BT_CONNECTED) {
696 opts.mtu = sco_pi(sk)->conn->mtu;
698 BT_DBG("mtu %d", opts.mtu);
700 len = min_t(unsigned int, len, sizeof(opts));
701 if (copy_to_user(optval, (char *)&opts, len))
707 if (sk->sk_state != BT_CONNECTED) {
712 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
713 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
715 len = min_t(unsigned int, len, sizeof(cinfo));
716 if (copy_to_user(optval, (char *)&cinfo, len))
730 static int sco_sock_release(struct socket *sock)
732 struct sock *sk = sock->sk;
735 BT_DBG("sock %p, sk %p", sock, sk);
742 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
744 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
753 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
755 BT_DBG("conn %p", conn);
757 sco_pi(sk)->conn = conn;
761 bt_accept_enqueue(parent, sk);
765 * Must be called on the locked socket. */
766 static void sco_chan_del(struct sock *sk, int err)
768 struct sco_conn *conn;
770 conn = sco_pi(sk)->conn;
772 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
777 sco_pi(sk)->conn = NULL;
778 sco_conn_unlock(conn);
779 hci_conn_put(conn->hcon);
782 sk->sk_state = BT_CLOSED;
784 sk->sk_state_change(sk);
786 sock_set_flag(sk, SOCK_ZAPPED);
789 static void sco_conn_ready(struct sco_conn *conn)
791 struct sock *parent, *sk;
793 BT_DBG("conn %p", conn);
797 if ((sk = conn->sk)) {
798 sco_sock_clear_timer(sk);
800 sk->sk_state = BT_CONNECTED;
801 sk->sk_state_change(sk);
804 parent = sco_get_sock_listen(conn->src);
808 bh_lock_sock(parent);
810 sk = sco_sock_alloc(NULL, BTPROTO_SCO, GFP_ATOMIC);
812 bh_unlock_sock(parent);
816 sco_sock_init(sk, parent);
818 bacpy(&bt_sk(sk)->src, conn->src);
819 bacpy(&bt_sk(sk)->dst, conn->dst);
821 hci_conn_hold(conn->hcon);
822 __sco_chan_add(conn, sk, parent);
824 sk->sk_state = BT_CONNECTED;
827 parent->sk_data_ready(parent, 1);
829 bh_unlock_sock(parent);
833 sco_conn_unlock(conn);
836 /* ----- SCO interface with lower layer (HCI) ----- */
837 static int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type)
839 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
841 /* Always accept connection */
842 return HCI_LM_ACCEPT;
845 static int sco_connect_cfm(struct hci_conn *hcon, __u8 status)
847 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
849 if (hcon->type != SCO_LINK)
853 struct sco_conn *conn;
855 conn = sco_conn_add(hcon, status);
857 sco_conn_ready(conn);
859 sco_conn_del(hcon, bt_err(status));
864 static int sco_disconn_ind(struct hci_conn *hcon, __u8 reason)
866 BT_DBG("hcon %p reason %d", hcon, reason);
868 if (hcon->type != SCO_LINK)
871 sco_conn_del(hcon, bt_err(reason));
875 static int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
877 struct sco_conn *conn = hcon->sco_data;
882 BT_DBG("conn %p len %d", conn, skb->len);
885 sco_recv_frame(conn, skb);
894 static ssize_t sco_sysfs_show(struct class *dev, char *buf)
897 struct hlist_node *node;
900 read_lock_bh(&sco_sk_list.lock);
902 sk_for_each(sk, node, &sco_sk_list.head) {
903 str += sprintf(str, "%s %s %d\n",
904 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
908 read_unlock_bh(&sco_sk_list.lock);
913 static CLASS_ATTR(sco, S_IRUGO, sco_sysfs_show, NULL);
915 static const struct proto_ops sco_sock_ops = {
916 .family = PF_BLUETOOTH,
917 .owner = THIS_MODULE,
918 .release = sco_sock_release,
919 .bind = sco_sock_bind,
920 .connect = sco_sock_connect,
921 .listen = sco_sock_listen,
922 .accept = sco_sock_accept,
923 .getname = sco_sock_getname,
924 .sendmsg = sco_sock_sendmsg,
925 .recvmsg = bt_sock_recvmsg,
926 .poll = bt_sock_poll,
927 .ioctl = sock_no_ioctl,
928 .mmap = sock_no_mmap,
929 .socketpair = sock_no_socketpair,
930 .shutdown = sock_no_shutdown,
931 .setsockopt = sco_sock_setsockopt,
932 .getsockopt = sco_sock_getsockopt
935 static struct net_proto_family sco_sock_family_ops = {
936 .family = PF_BLUETOOTH,
937 .owner = THIS_MODULE,
938 .create = sco_sock_create,
941 static struct hci_proto sco_hci_proto = {
944 .connect_ind = sco_connect_ind,
945 .connect_cfm = sco_connect_cfm,
946 .disconn_ind = sco_disconn_ind,
947 .recv_scodata = sco_recv_scodata
950 static int __init sco_init(void)
954 err = proto_register(&sco_proto, 0);
958 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
960 BT_ERR("SCO socket registration failed");
964 err = hci_register_proto(&sco_hci_proto);
966 BT_ERR("SCO protocol registration failed");
967 bt_sock_unregister(BTPROTO_SCO);
971 if (class_create_file(bt_class, &class_attr_sco) < 0)
972 BT_ERR("Failed to create SCO info file");
974 BT_INFO("SCO (Voice Link) ver %s", VERSION);
975 BT_INFO("SCO socket layer initialized");
980 proto_unregister(&sco_proto);
984 static void __exit sco_exit(void)
986 class_remove_file(bt_class, &class_attr_sco);
988 if (bt_sock_unregister(BTPROTO_SCO) < 0)
989 BT_ERR("SCO socket unregistration failed");
991 if (hci_unregister_proto(&sco_hci_proto) < 0)
992 BT_ERR("SCO protocol unregistration failed");
994 proto_unregister(&sco_proto);
997 module_init(sco_init);
998 module_exit(sco_exit);
1000 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
1001 MODULE_DESCRIPTION("Bluetooth SCO ver " VERSION);
1002 MODULE_VERSION(VERSION);
1003 MODULE_LICENSE("GPL");
1004 MODULE_ALIAS("bt-proto-2");