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 if (!(sk = sco_sock_alloc(sock, protocol, GFP_KERNEL)))
458 sco_sock_init(sk, NULL);
462 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
464 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
465 struct sock *sk = sock->sk;
466 bdaddr_t *src = &sa->sco_bdaddr;
469 BT_DBG("sk %p %s", sk, batostr(&sa->sco_bdaddr));
471 if (!addr || addr->sa_family != AF_BLUETOOTH)
476 if (sk->sk_state != BT_OPEN) {
481 write_lock_bh(&sco_sk_list.lock);
483 if (bacmp(src, BDADDR_ANY) && __sco_get_sock_by_addr(src)) {
486 /* Save source address */
487 bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
488 sk->sk_state = BT_BOUND;
491 write_unlock_bh(&sco_sk_list.lock);
498 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
500 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
501 struct sock *sk = sock->sk;
507 if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_sco))
510 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
513 if (sk->sk_type != SOCK_SEQPACKET)
518 /* Set destination address and psm */
519 bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
521 if ((err = sco_connect(sk)))
524 err = bt_sock_wait_state(sk, BT_CONNECTED,
525 sock_sndtimeo(sk, flags & O_NONBLOCK));
532 static int sco_sock_listen(struct socket *sock, int backlog)
534 struct sock *sk = sock->sk;
537 BT_DBG("sk %p backlog %d", sk, backlog);
541 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
546 sk->sk_max_ack_backlog = backlog;
547 sk->sk_ack_backlog = 0;
548 sk->sk_state = BT_LISTEN;
555 static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
557 DECLARE_WAITQUEUE(wait, current);
558 struct sock *sk = sock->sk, *ch;
564 if (sk->sk_state != BT_LISTEN) {
569 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
571 BT_DBG("sk %p timeo %ld", sk, timeo);
573 /* Wait for an incoming connection. (wake-one). */
574 add_wait_queue_exclusive(sk->sk_sleep, &wait);
575 while (!(ch = bt_accept_dequeue(sk, newsock))) {
576 set_current_state(TASK_INTERRUPTIBLE);
583 timeo = schedule_timeout(timeo);
586 if (sk->sk_state != BT_LISTEN) {
591 if (signal_pending(current)) {
592 err = sock_intr_errno(timeo);
596 set_current_state(TASK_RUNNING);
597 remove_wait_queue(sk->sk_sleep, &wait);
602 newsock->state = SS_CONNECTED;
604 BT_DBG("new socket %p", ch);
611 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
613 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
614 struct sock *sk = sock->sk;
616 BT_DBG("sock %p, sk %p", sock, sk);
618 addr->sa_family = AF_BLUETOOTH;
619 *len = sizeof(struct sockaddr_sco);
622 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
624 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
629 static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
630 struct msghdr *msg, size_t len)
632 struct sock *sk = sock->sk;
635 BT_DBG("sock %p, sk %p", sock, sk);
637 err = sock_error(sk);
641 if (msg->msg_flags & MSG_OOB)
646 if (sk->sk_state == BT_CONNECTED)
647 err = sco_send_frame(sk, msg, len);
655 static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
657 struct sock *sk = sock->sk;
674 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
676 struct sock *sk = sock->sk;
677 struct sco_options opts;
678 struct sco_conninfo cinfo;
683 if (get_user(len, optlen))
690 if (sk->sk_state != BT_CONNECTED) {
695 opts.mtu = sco_pi(sk)->conn->mtu;
697 BT_DBG("mtu %d", opts.mtu);
699 len = min_t(unsigned int, len, sizeof(opts));
700 if (copy_to_user(optval, (char *)&opts, len))
706 if (sk->sk_state != BT_CONNECTED) {
711 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
712 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
714 len = min_t(unsigned int, len, sizeof(cinfo));
715 if (copy_to_user(optval, (char *)&cinfo, len))
729 static int sco_sock_release(struct socket *sock)
731 struct sock *sk = sock->sk;
734 BT_DBG("sock %p, sk %p", sock, sk);
741 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
743 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
752 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
754 BT_DBG("conn %p", conn);
756 sco_pi(sk)->conn = conn;
760 bt_accept_enqueue(parent, sk);
764 * Must be called on the locked socket. */
765 static void sco_chan_del(struct sock *sk, int err)
767 struct sco_conn *conn;
769 conn = sco_pi(sk)->conn;
771 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
776 sco_pi(sk)->conn = NULL;
777 sco_conn_unlock(conn);
778 hci_conn_put(conn->hcon);
781 sk->sk_state = BT_CLOSED;
783 sk->sk_state_change(sk);
785 sock_set_flag(sk, SOCK_ZAPPED);
788 static void sco_conn_ready(struct sco_conn *conn)
790 struct sock *parent, *sk;
792 BT_DBG("conn %p", conn);
796 if ((sk = conn->sk)) {
797 sco_sock_clear_timer(sk);
799 sk->sk_state = BT_CONNECTED;
800 sk->sk_state_change(sk);
803 parent = sco_get_sock_listen(conn->src);
807 bh_lock_sock(parent);
809 sk = sco_sock_alloc(NULL, BTPROTO_SCO, GFP_ATOMIC);
811 bh_unlock_sock(parent);
815 sco_sock_init(sk, parent);
817 bacpy(&bt_sk(sk)->src, conn->src);
818 bacpy(&bt_sk(sk)->dst, conn->dst);
820 hci_conn_hold(conn->hcon);
821 __sco_chan_add(conn, sk, parent);
823 sk->sk_state = BT_CONNECTED;
826 parent->sk_data_ready(parent, 1);
828 bh_unlock_sock(parent);
832 sco_conn_unlock(conn);
835 /* ----- SCO interface with lower layer (HCI) ----- */
836 static int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type)
838 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
840 /* Always accept connection */
841 return HCI_LM_ACCEPT;
844 static int sco_connect_cfm(struct hci_conn *hcon, __u8 status)
846 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
848 if (hcon->type != SCO_LINK)
852 struct sco_conn *conn;
854 conn = sco_conn_add(hcon, status);
856 sco_conn_ready(conn);
858 sco_conn_del(hcon, bt_err(status));
863 static int sco_disconn_ind(struct hci_conn *hcon, __u8 reason)
865 BT_DBG("hcon %p reason %d", hcon, reason);
867 if (hcon->type != SCO_LINK)
870 sco_conn_del(hcon, bt_err(reason));
874 static int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
876 struct sco_conn *conn = hcon->sco_data;
881 BT_DBG("conn %p len %d", conn, skb->len);
884 sco_recv_frame(conn, skb);
893 static ssize_t sco_sysfs_show(struct class *dev, char *buf)
896 struct hlist_node *node;
899 read_lock_bh(&sco_sk_list.lock);
901 sk_for_each(sk, node, &sco_sk_list.head) {
902 str += sprintf(str, "%s %s %d\n",
903 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
907 read_unlock_bh(&sco_sk_list.lock);
912 static CLASS_ATTR(sco, S_IRUGO, sco_sysfs_show, NULL);
914 static const struct proto_ops sco_sock_ops = {
915 .family = PF_BLUETOOTH,
916 .owner = THIS_MODULE,
917 .release = sco_sock_release,
918 .bind = sco_sock_bind,
919 .connect = sco_sock_connect,
920 .listen = sco_sock_listen,
921 .accept = sco_sock_accept,
922 .getname = sco_sock_getname,
923 .sendmsg = sco_sock_sendmsg,
924 .recvmsg = bt_sock_recvmsg,
925 .poll = bt_sock_poll,
926 .ioctl = sock_no_ioctl,
927 .mmap = sock_no_mmap,
928 .socketpair = sock_no_socketpair,
929 .shutdown = sock_no_shutdown,
930 .setsockopt = sco_sock_setsockopt,
931 .getsockopt = sco_sock_getsockopt
934 static struct net_proto_family sco_sock_family_ops = {
935 .family = PF_BLUETOOTH,
936 .owner = THIS_MODULE,
937 .create = sco_sock_create,
940 static struct hci_proto sco_hci_proto = {
943 .connect_ind = sco_connect_ind,
944 .connect_cfm = sco_connect_cfm,
945 .disconn_ind = sco_disconn_ind,
946 .recv_scodata = sco_recv_scodata
949 static int __init sco_init(void)
953 err = proto_register(&sco_proto, 0);
957 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
959 BT_ERR("SCO socket registration failed");
963 err = hci_register_proto(&sco_hci_proto);
965 BT_ERR("SCO protocol registration failed");
966 bt_sock_unregister(BTPROTO_SCO);
970 class_create_file(bt_class, &class_attr_sco);
972 BT_INFO("SCO (Voice Link) ver %s", VERSION);
973 BT_INFO("SCO socket layer initialized");
978 proto_unregister(&sco_proto);
982 static void __exit sco_exit(void)
984 class_remove_file(bt_class, &class_attr_sco);
986 if (bt_sock_unregister(BTPROTO_SCO) < 0)
987 BT_ERR("SCO socket unregistration failed");
989 if (hci_unregister_proto(&sco_hci_proto) < 0)
990 BT_ERR("SCO protocol unregistration failed");
992 proto_unregister(&sco_proto);
995 module_init(sco_init);
996 module_exit(sco_exit);
998 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
999 MODULE_DESCRIPTION("Bluetooth SCO ver " VERSION);
1000 MODULE_VERSION(VERSION);
1001 MODULE_LICENSE("GPL");
1002 MODULE_ALIAS("bt-proto-2");