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(sco_sk_list.lock)
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 /* ---- SCO connections ---- */
101 static struct sco_conn *sco_conn_add(struct hci_conn *hcon, __u8 status)
103 struct hci_dev *hdev = hcon->hdev;
104 struct sco_conn *conn = hcon->sco_data;
109 conn = kzalloc(sizeof(struct sco_conn), GFP_ATOMIC);
113 spin_lock_init(&conn->lock);
115 hcon->sco_data = conn;
118 conn->src = &hdev->bdaddr;
119 conn->dst = &hcon->dst;
121 if (hdev->sco_mtu > 0)
122 conn->mtu = hdev->sco_mtu;
126 BT_DBG("hcon %p conn %p", hcon, conn);
131 static inline struct sock *sco_chan_get(struct sco_conn *conn)
133 struct sock *sk = NULL;
136 sco_conn_unlock(conn);
140 static int sco_conn_del(struct hci_conn *hcon, int err)
142 struct sco_conn *conn;
145 if (!(conn = hcon->sco_data))
148 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
151 if ((sk = sco_chan_get(conn))) {
153 sco_sock_clear_timer(sk);
154 sco_chan_del(sk, err);
159 hcon->sco_data = NULL;
164 static inline int sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
172 __sco_chan_add(conn, sk, parent);
174 sco_conn_unlock(conn);
178 static int sco_connect(struct sock *sk)
180 bdaddr_t *src = &bt_sk(sk)->src;
181 bdaddr_t *dst = &bt_sk(sk)->dst;
182 struct sco_conn *conn;
183 struct hci_conn *hcon;
184 struct hci_dev *hdev;
187 BT_DBG("%s -> %s", batostr(src), batostr(dst));
189 if (!(hdev = hci_get_route(dst, src)))
190 return -EHOSTUNREACH;
192 hci_dev_lock_bh(hdev);
196 type = lmp_esco_capable(hdev) ? ESCO_LINK : SCO_LINK;
198 hcon = hci_connect(hdev, type, dst);
202 conn = sco_conn_add(hcon, 0);
208 /* Update source addr of the socket */
209 bacpy(src, conn->src);
211 err = sco_chan_add(conn, sk, NULL);
215 if (hcon->state == BT_CONNECTED) {
216 sco_sock_clear_timer(sk);
217 sk->sk_state = BT_CONNECTED;
219 sk->sk_state = BT_CONNECT;
220 sco_sock_set_timer(sk, sk->sk_sndtimeo);
224 hci_dev_unlock_bh(hdev);
229 static inline int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
231 struct sco_conn *conn = sco_pi(sk)->conn;
235 /* Check outgoing MTU */
239 BT_DBG("sk %p len %d", sk, len);
241 count = min_t(unsigned int, conn->mtu, len);
242 if (!(skb = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err)))
245 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
250 if ((err = hci_send_sco(conn->hcon, skb)) < 0)
260 static inline void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
262 struct sock *sk = sco_chan_get(conn);
267 BT_DBG("sk %p len %d", sk, skb->len);
269 if (sk->sk_state != BT_CONNECTED)
272 if (!sock_queue_rcv_skb(sk, skb))
280 /* -------- Socket interface ---------- */
281 static struct sock *__sco_get_sock_by_addr(bdaddr_t *ba)
284 struct hlist_node *node;
286 sk_for_each(sk, node, &sco_sk_list.head)
287 if (!bacmp(&bt_sk(sk)->src, ba))
294 /* Find socket listening on source bdaddr.
295 * Returns closest match.
297 static struct sock *sco_get_sock_listen(bdaddr_t *src)
299 struct sock *sk = NULL, *sk1 = NULL;
300 struct hlist_node *node;
302 read_lock(&sco_sk_list.lock);
304 sk_for_each(sk, node, &sco_sk_list.head) {
305 if (sk->sk_state != BT_LISTEN)
309 if (!bacmp(&bt_sk(sk)->src, src))
313 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
317 read_unlock(&sco_sk_list.lock);
319 return node ? sk : sk1;
322 static void sco_sock_destruct(struct sock *sk)
326 skb_queue_purge(&sk->sk_receive_queue);
327 skb_queue_purge(&sk->sk_write_queue);
330 static void sco_sock_cleanup_listen(struct sock *parent)
334 BT_DBG("parent %p", parent);
336 /* Close not yet accepted channels */
337 while ((sk = bt_accept_dequeue(parent, NULL))) {
342 parent->sk_state = BT_CLOSED;
343 sock_set_flag(parent, SOCK_ZAPPED);
346 /* Kill socket (only if zapped and orphan)
347 * Must be called on unlocked socket.
349 static void sco_sock_kill(struct sock *sk)
351 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
354 BT_DBG("sk %p state %d", sk, sk->sk_state);
356 /* Kill poor orphan */
357 bt_sock_unlink(&sco_sk_list, sk);
358 sock_set_flag(sk, SOCK_DEAD);
363 * Must be called on unlocked socket.
365 static void sco_sock_close(struct sock *sk)
367 struct sco_conn *conn;
369 sco_sock_clear_timer(sk);
373 conn = sco_pi(sk)->conn;
375 BT_DBG("sk %p state %d conn %p socket %p", sk, sk->sk_state, conn, sk->sk_socket);
377 switch (sk->sk_state) {
379 sco_sock_cleanup_listen(sk);
386 sco_chan_del(sk, ECONNRESET);
390 sock_set_flag(sk, SOCK_ZAPPED);
399 static void sco_sock_init(struct sock *sk, struct sock *parent)
404 sk->sk_type = parent->sk_type;
407 static struct proto sco_proto = {
409 .owner = THIS_MODULE,
410 .obj_size = sizeof(struct sco_pinfo)
413 static struct sock *sco_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
417 sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto);
421 sock_init_data(sock, sk);
422 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
424 sk->sk_destruct = sco_sock_destruct;
425 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
427 sock_reset_flag(sk, SOCK_ZAPPED);
429 sk->sk_protocol = proto;
430 sk->sk_state = BT_OPEN;
432 setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);
434 bt_sock_link(&sco_sk_list, sk);
438 static int sco_sock_create(struct net *net, struct socket *sock, int protocol)
442 BT_DBG("sock %p", sock);
444 sock->state = SS_UNCONNECTED;
446 if (sock->type != SOCK_SEQPACKET)
447 return -ESOCKTNOSUPPORT;
449 sock->ops = &sco_sock_ops;
451 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC);
455 sco_sock_init(sk, NULL);
459 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
461 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
462 struct sock *sk = sock->sk;
463 bdaddr_t *src = &sa->sco_bdaddr;
466 BT_DBG("sk %p %s", sk, batostr(&sa->sco_bdaddr));
468 if (!addr || addr->sa_family != AF_BLUETOOTH)
473 if (sk->sk_state != BT_OPEN) {
478 write_lock_bh(&sco_sk_list.lock);
480 if (bacmp(src, BDADDR_ANY) && __sco_get_sock_by_addr(src)) {
483 /* Save source address */
484 bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
485 sk->sk_state = BT_BOUND;
488 write_unlock_bh(&sco_sk_list.lock);
495 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
497 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
498 struct sock *sk = sock->sk;
504 if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_sco))
507 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
510 if (sk->sk_type != SOCK_SEQPACKET)
515 /* Set destination address and psm */
516 bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
518 if ((err = sco_connect(sk)))
521 err = bt_sock_wait_state(sk, BT_CONNECTED,
522 sock_sndtimeo(sk, flags & O_NONBLOCK));
529 static int sco_sock_listen(struct socket *sock, int backlog)
531 struct sock *sk = sock->sk;
534 BT_DBG("sk %p backlog %d", sk, backlog);
538 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
543 sk->sk_max_ack_backlog = backlog;
544 sk->sk_ack_backlog = 0;
545 sk->sk_state = BT_LISTEN;
552 static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
554 DECLARE_WAITQUEUE(wait, current);
555 struct sock *sk = sock->sk, *ch;
561 if (sk->sk_state != BT_LISTEN) {
566 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
568 BT_DBG("sk %p timeo %ld", sk, timeo);
570 /* Wait for an incoming connection. (wake-one). */
571 add_wait_queue_exclusive(sk->sk_sleep, &wait);
572 while (!(ch = bt_accept_dequeue(sk, newsock))) {
573 set_current_state(TASK_INTERRUPTIBLE);
580 timeo = schedule_timeout(timeo);
583 if (sk->sk_state != BT_LISTEN) {
588 if (signal_pending(current)) {
589 err = sock_intr_errno(timeo);
593 set_current_state(TASK_RUNNING);
594 remove_wait_queue(sk->sk_sleep, &wait);
599 newsock->state = SS_CONNECTED;
601 BT_DBG("new socket %p", ch);
608 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
610 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
611 struct sock *sk = sock->sk;
613 BT_DBG("sock %p, sk %p", sock, sk);
615 addr->sa_family = AF_BLUETOOTH;
616 *len = sizeof(struct sockaddr_sco);
619 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
621 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
626 static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
627 struct msghdr *msg, size_t len)
629 struct sock *sk = sock->sk;
632 BT_DBG("sock %p, sk %p", sock, sk);
634 err = sock_error(sk);
638 if (msg->msg_flags & MSG_OOB)
643 if (sk->sk_state == BT_CONNECTED)
644 err = sco_send_frame(sk, msg, len);
652 static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
654 struct sock *sk = sock->sk;
671 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
673 struct sock *sk = sock->sk;
674 struct sco_options opts;
675 struct sco_conninfo cinfo;
680 if (get_user(len, optlen))
687 if (sk->sk_state != BT_CONNECTED) {
692 opts.mtu = sco_pi(sk)->conn->mtu;
694 BT_DBG("mtu %d", opts.mtu);
696 len = min_t(unsigned int, len, sizeof(opts));
697 if (copy_to_user(optval, (char *)&opts, len))
703 if (sk->sk_state != BT_CONNECTED) {
708 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
709 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
711 len = min_t(unsigned int, len, sizeof(cinfo));
712 if (copy_to_user(optval, (char *)&cinfo, len))
726 static int sco_sock_release(struct socket *sock)
728 struct sock *sk = sock->sk;
731 BT_DBG("sock %p, sk %p", sock, sk);
738 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
740 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
749 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
751 BT_DBG("conn %p", conn);
753 sco_pi(sk)->conn = conn;
757 bt_accept_enqueue(parent, sk);
761 * Must be called on the locked socket. */
762 static void sco_chan_del(struct sock *sk, int err)
764 struct sco_conn *conn;
766 conn = sco_pi(sk)->conn;
768 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
773 sco_pi(sk)->conn = NULL;
774 sco_conn_unlock(conn);
775 hci_conn_put(conn->hcon);
778 sk->sk_state = BT_CLOSED;
780 sk->sk_state_change(sk);
782 sock_set_flag(sk, SOCK_ZAPPED);
785 static void sco_conn_ready(struct sco_conn *conn)
787 struct sock *parent, *sk;
789 BT_DBG("conn %p", conn);
793 if ((sk = conn->sk)) {
794 sco_sock_clear_timer(sk);
796 sk->sk_state = BT_CONNECTED;
797 sk->sk_state_change(sk);
800 parent = sco_get_sock_listen(conn->src);
804 bh_lock_sock(parent);
806 sk = sco_sock_alloc(sock_net(parent), NULL, BTPROTO_SCO, GFP_ATOMIC);
808 bh_unlock_sock(parent);
812 sco_sock_init(sk, parent);
814 bacpy(&bt_sk(sk)->src, conn->src);
815 bacpy(&bt_sk(sk)->dst, conn->dst);
817 hci_conn_hold(conn->hcon);
818 __sco_chan_add(conn, sk, parent);
820 sk->sk_state = BT_CONNECTED;
823 parent->sk_data_ready(parent, 1);
825 bh_unlock_sock(parent);
829 sco_conn_unlock(conn);
832 /* ----- SCO interface with lower layer (HCI) ----- */
833 static int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type)
835 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
837 /* Always accept connection */
838 return HCI_LM_ACCEPT;
841 static int sco_connect_cfm(struct hci_conn *hcon, __u8 status)
843 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
845 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
849 struct sco_conn *conn;
851 conn = sco_conn_add(hcon, status);
853 sco_conn_ready(conn);
855 sco_conn_del(hcon, bt_err(status));
860 static int sco_disconn_ind(struct hci_conn *hcon, __u8 reason)
862 BT_DBG("hcon %p reason %d", hcon, reason);
864 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
867 sco_conn_del(hcon, bt_err(reason));
872 static int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
874 struct sco_conn *conn = hcon->sco_data;
879 BT_DBG("conn %p len %d", conn, skb->len);
882 sco_recv_frame(conn, skb);
891 static ssize_t sco_sysfs_show(struct class *dev, char *buf)
894 struct hlist_node *node;
897 read_lock_bh(&sco_sk_list.lock);
899 sk_for_each(sk, node, &sco_sk_list.head) {
900 str += sprintf(str, "%s %s %d\n",
901 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
905 read_unlock_bh(&sco_sk_list.lock);
910 static CLASS_ATTR(sco, S_IRUGO, sco_sysfs_show, NULL);
912 static const struct proto_ops sco_sock_ops = {
913 .family = PF_BLUETOOTH,
914 .owner = THIS_MODULE,
915 .release = sco_sock_release,
916 .bind = sco_sock_bind,
917 .connect = sco_sock_connect,
918 .listen = sco_sock_listen,
919 .accept = sco_sock_accept,
920 .getname = sco_sock_getname,
921 .sendmsg = sco_sock_sendmsg,
922 .recvmsg = bt_sock_recvmsg,
923 .poll = bt_sock_poll,
924 .ioctl = sock_no_ioctl,
925 .mmap = sock_no_mmap,
926 .socketpair = sock_no_socketpair,
927 .shutdown = sock_no_shutdown,
928 .setsockopt = sco_sock_setsockopt,
929 .getsockopt = sco_sock_getsockopt
932 static struct net_proto_family sco_sock_family_ops = {
933 .family = PF_BLUETOOTH,
934 .owner = THIS_MODULE,
935 .create = sco_sock_create,
938 static struct hci_proto sco_hci_proto = {
941 .connect_ind = sco_connect_ind,
942 .connect_cfm = sco_connect_cfm,
943 .disconn_ind = sco_disconn_ind,
944 .recv_scodata = sco_recv_scodata
947 static int __init sco_init(void)
951 err = proto_register(&sco_proto, 0);
955 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
957 BT_ERR("SCO socket registration failed");
961 err = hci_register_proto(&sco_hci_proto);
963 BT_ERR("SCO protocol registration failed");
964 bt_sock_unregister(BTPROTO_SCO);
968 if (class_create_file(bt_class, &class_attr_sco) < 0)
969 BT_ERR("Failed to create SCO info file");
971 BT_INFO("SCO (Voice Link) ver %s", VERSION);
972 BT_INFO("SCO socket layer initialized");
977 proto_unregister(&sco_proto);
981 static void __exit sco_exit(void)
983 class_remove_file(bt_class, &class_attr_sco);
985 if (bt_sock_unregister(BTPROTO_SCO) < 0)
986 BT_ERR("SCO socket unregistration failed");
988 if (hci_unregister_proto(&sco_hci_proto) < 0)
989 BT_ERR("SCO protocol unregistration failed");
991 proto_unregister(&sco_proto);
994 module_init(sco_init);
995 module_exit(sco_exit);
997 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
998 MODULE_DESCRIPTION("Bluetooth SCO ver " VERSION);
999 MODULE_VERSION(VERSION);
1000 MODULE_LICENSE("GPL");
1001 MODULE_ALIAS("bt-proto-2");