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/debugfs.h>
42 #include <linux/seq_file.h>
43 #include <linux/list.h>
46 #include <asm/system.h>
47 #include <asm/uaccess.h>
49 #include <net/bluetooth/bluetooth.h>
50 #include <net/bluetooth/hci_core.h>
51 #include <net/bluetooth/sco.h>
55 static int disable_esco = 0;
57 static const struct proto_ops sco_sock_ops;
59 static struct bt_sock_list sco_sk_list = {
60 .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
63 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent);
64 static void sco_chan_del(struct sock *sk, int err);
66 static int sco_conn_del(struct hci_conn *conn, int err);
68 static void sco_sock_close(struct sock *sk);
69 static void sco_sock_kill(struct sock *sk);
71 /* ---- SCO timers ---- */
72 static void sco_sock_timeout(unsigned long arg)
74 struct sock *sk = (struct sock *) arg;
76 BT_DBG("sock %p state %d", sk, sk->sk_state);
79 sk->sk_err = ETIMEDOUT;
80 sk->sk_state_change(sk);
87 static void sco_sock_set_timer(struct sock *sk, long timeout)
89 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
90 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
93 static void sco_sock_clear_timer(struct sock *sk)
95 BT_DBG("sock %p state %d", sk, sk->sk_state);
96 sk_stop_timer(sk, &sk->sk_timer);
99 /* ---- SCO connections ---- */
100 static struct sco_conn *sco_conn_add(struct hci_conn *hcon, __u8 status)
102 struct hci_dev *hdev = hcon->hdev;
103 struct sco_conn *conn = hcon->sco_data;
108 conn = kzalloc(sizeof(struct sco_conn), GFP_ATOMIC);
112 spin_lock_init(&conn->lock);
114 hcon->sco_data = conn;
117 conn->src = &hdev->bdaddr;
118 conn->dst = &hcon->dst;
120 if (hdev->sco_mtu > 0)
121 conn->mtu = hdev->sco_mtu;
125 BT_DBG("hcon %p conn %p", hcon, conn);
130 static inline struct sock *sco_chan_get(struct sco_conn *conn)
132 struct sock *sk = NULL;
135 sco_conn_unlock(conn);
139 static int sco_conn_del(struct hci_conn *hcon, int err)
141 struct sco_conn *conn;
144 if (!(conn = hcon->sco_data))
147 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
150 if ((sk = sco_chan_get(conn))) {
152 sco_sock_clear_timer(sk);
153 sco_chan_del(sk, err);
158 hcon->sco_data = NULL;
163 static inline int sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
171 __sco_chan_add(conn, sk, parent);
173 sco_conn_unlock(conn);
177 static int sco_connect(struct sock *sk)
179 bdaddr_t *src = &bt_sk(sk)->src;
180 bdaddr_t *dst = &bt_sk(sk)->dst;
181 struct sco_conn *conn;
182 struct hci_conn *hcon;
183 struct hci_dev *hdev;
186 BT_DBG("%s -> %s", batostr(src), batostr(dst));
188 if (!(hdev = hci_get_route(dst, src)))
189 return -EHOSTUNREACH;
191 hci_dev_lock_bh(hdev);
195 if (lmp_esco_capable(hdev) && !disable_esco)
200 hcon = hci_connect(hdev, type, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
204 conn = sco_conn_add(hcon, 0);
210 /* Update source addr of the socket */
211 bacpy(src, conn->src);
213 err = sco_chan_add(conn, sk, NULL);
217 if (hcon->state == BT_CONNECTED) {
218 sco_sock_clear_timer(sk);
219 sk->sk_state = BT_CONNECTED;
221 sk->sk_state = BT_CONNECT;
222 sco_sock_set_timer(sk, sk->sk_sndtimeo);
226 hci_dev_unlock_bh(hdev);
231 static inline int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
233 struct sco_conn *conn = sco_pi(sk)->conn;
237 /* Check outgoing MTU */
241 BT_DBG("sk %p len %d", sk, len);
243 count = min_t(unsigned int, conn->mtu, len);
244 skb = bt_skb_send_alloc(sk, count,
245 msg->msg_flags & MSG_DONTWAIT, &err);
249 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
254 hci_send_sco(conn->hcon, skb);
259 static inline void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
261 struct sock *sk = sco_chan_get(conn);
266 BT_DBG("sk %p len %d", sk, skb->len);
268 if (sk->sk_state != BT_CONNECTED)
271 if (!sock_queue_rcv_skb(sk, skb))
279 /* -------- Socket interface ---------- */
280 static struct sock *__sco_get_sock_by_addr(bdaddr_t *ba)
283 struct hlist_node *node;
285 sk_for_each(sk, node, &sco_sk_list.head)
286 if (!bacmp(&bt_sk(sk)->src, ba))
293 /* Find socket listening on source bdaddr.
294 * Returns closest match.
296 static struct sock *sco_get_sock_listen(bdaddr_t *src)
298 struct sock *sk = NULL, *sk1 = NULL;
299 struct hlist_node *node;
301 read_lock(&sco_sk_list.lock);
303 sk_for_each(sk, node, &sco_sk_list.head) {
304 if (sk->sk_state != BT_LISTEN)
308 if (!bacmp(&bt_sk(sk)->src, src))
312 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
316 read_unlock(&sco_sk_list.lock);
318 return node ? sk : sk1;
321 static void sco_sock_destruct(struct sock *sk)
325 skb_queue_purge(&sk->sk_receive_queue);
326 skb_queue_purge(&sk->sk_write_queue);
329 static void sco_sock_cleanup_listen(struct sock *parent)
333 BT_DBG("parent %p", parent);
335 /* Close not yet accepted channels */
336 while ((sk = bt_accept_dequeue(parent, NULL))) {
341 parent->sk_state = BT_CLOSED;
342 sock_set_flag(parent, SOCK_ZAPPED);
345 /* Kill socket (only if zapped and orphan)
346 * Must be called on unlocked socket.
348 static void sco_sock_kill(struct sock *sk)
350 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
353 BT_DBG("sk %p state %d", sk, sk->sk_state);
355 /* Kill poor orphan */
356 bt_sock_unlink(&sco_sk_list, sk);
357 sock_set_flag(sk, SOCK_DEAD);
361 static void __sco_sock_close(struct sock *sk)
363 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
365 switch (sk->sk_state) {
367 sco_sock_cleanup_listen(sk);
374 sco_chan_del(sk, ECONNRESET);
378 sock_set_flag(sk, SOCK_ZAPPED);
383 /* Must be called on unlocked socket. */
384 static void sco_sock_close(struct sock *sk)
386 sco_sock_clear_timer(sk);
388 __sco_sock_close(sk);
393 static void sco_sock_init(struct sock *sk, struct sock *parent)
398 sk->sk_type = parent->sk_type;
401 static struct proto sco_proto = {
403 .owner = THIS_MODULE,
404 .obj_size = sizeof(struct sco_pinfo)
407 static struct sock *sco_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
411 sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto);
415 sock_init_data(sock, sk);
416 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
418 sk->sk_destruct = sco_sock_destruct;
419 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
421 sock_reset_flag(sk, SOCK_ZAPPED);
423 sk->sk_protocol = proto;
424 sk->sk_state = BT_OPEN;
426 setup_timer(&sk->sk_timer, sco_sock_timeout, (unsigned long)sk);
428 bt_sock_link(&sco_sk_list, sk);
432 static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
437 BT_DBG("sock %p", sock);
439 sock->state = SS_UNCONNECTED;
441 if (sock->type != SOCK_SEQPACKET)
442 return -ESOCKTNOSUPPORT;
444 sock->ops = &sco_sock_ops;
446 sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC);
450 sco_sock_init(sk, NULL);
454 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
456 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
457 struct sock *sk = sock->sk;
458 bdaddr_t *src = &sa->sco_bdaddr;
461 BT_DBG("sk %p %s", sk, batostr(&sa->sco_bdaddr));
463 if (!addr || addr->sa_family != AF_BLUETOOTH)
468 if (sk->sk_state != BT_OPEN) {
473 write_lock_bh(&sco_sk_list.lock);
475 if (bacmp(src, BDADDR_ANY) && __sco_get_sock_by_addr(src)) {
478 /* Save source address */
479 bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
480 sk->sk_state = BT_BOUND;
483 write_unlock_bh(&sco_sk_list.lock);
490 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
492 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
493 struct sock *sk = sock->sk;
499 if (alen < sizeof(struct sockaddr_sco) ||
500 addr->sa_family != AF_BLUETOOTH)
503 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
506 if (sk->sk_type != SOCK_SEQPACKET)
511 /* Set destination address and psm */
512 bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
514 if ((err = sco_connect(sk)))
517 err = bt_sock_wait_state(sk, BT_CONNECTED,
518 sock_sndtimeo(sk, flags & O_NONBLOCK));
525 static int sco_sock_listen(struct socket *sock, int backlog)
527 struct sock *sk = sock->sk;
530 BT_DBG("sk %p backlog %d", sk, backlog);
534 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
539 sk->sk_max_ack_backlog = backlog;
540 sk->sk_ack_backlog = 0;
541 sk->sk_state = BT_LISTEN;
548 static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
550 DECLARE_WAITQUEUE(wait, current);
551 struct sock *sk = sock->sk, *ch;
557 if (sk->sk_state != BT_LISTEN) {
562 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
564 BT_DBG("sk %p timeo %ld", sk, timeo);
566 /* Wait for an incoming connection. (wake-one). */
567 add_wait_queue_exclusive(sk_sleep(sk), &wait);
568 while (!(ch = bt_accept_dequeue(sk, newsock))) {
569 set_current_state(TASK_INTERRUPTIBLE);
576 timeo = schedule_timeout(timeo);
579 if (sk->sk_state != BT_LISTEN) {
584 if (signal_pending(current)) {
585 err = sock_intr_errno(timeo);
589 set_current_state(TASK_RUNNING);
590 remove_wait_queue(sk_sleep(sk), &wait);
595 newsock->state = SS_CONNECTED;
597 BT_DBG("new socket %p", ch);
604 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
606 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
607 struct sock *sk = sock->sk;
609 BT_DBG("sock %p, sk %p", sock, sk);
611 addr->sa_family = AF_BLUETOOTH;
612 *len = sizeof(struct sockaddr_sco);
615 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
617 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
622 static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
623 struct msghdr *msg, size_t len)
625 struct sock *sk = sock->sk;
628 BT_DBG("sock %p, sk %p", sock, sk);
630 err = sock_error(sk);
634 if (msg->msg_flags & MSG_OOB)
639 if (sk->sk_state == BT_CONNECTED)
640 err = sco_send_frame(sk, msg, len);
648 static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
650 struct sock *sk = sock->sk;
667 static int sco_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
669 struct sock *sk = sock->sk;
670 struct sco_options opts;
671 struct sco_conninfo cinfo;
676 if (get_user(len, optlen))
683 if (sk->sk_state != BT_CONNECTED) {
688 opts.mtu = sco_pi(sk)->conn->mtu;
690 BT_DBG("mtu %d", opts.mtu);
692 len = min_t(unsigned int, len, sizeof(opts));
693 if (copy_to_user(optval, (char *)&opts, len))
699 if (sk->sk_state != BT_CONNECTED) {
704 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
705 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
707 len = min_t(unsigned int, len, sizeof(cinfo));
708 if (copy_to_user(optval, (char *)&cinfo, len))
722 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
724 struct sock *sk = sock->sk;
729 if (level == SOL_SCO)
730 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
732 if (get_user(len, optlen))
747 static int sco_sock_shutdown(struct socket *sock, int how)
749 struct sock *sk = sock->sk;
752 BT_DBG("sock %p, sk %p", sock, sk);
758 if (!sk->sk_shutdown) {
759 sk->sk_shutdown = SHUTDOWN_MASK;
760 sco_sock_clear_timer(sk);
761 __sco_sock_close(sk);
763 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
764 err = bt_sock_wait_state(sk, BT_CLOSED,
771 static int sco_sock_release(struct socket *sock)
773 struct sock *sk = sock->sk;
776 BT_DBG("sock %p, sk %p", sock, sk);
783 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
785 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
794 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
796 BT_DBG("conn %p", conn);
798 sco_pi(sk)->conn = conn;
802 bt_accept_enqueue(parent, sk);
806 * Must be called on the locked socket. */
807 static void sco_chan_del(struct sock *sk, int err)
809 struct sco_conn *conn;
811 conn = sco_pi(sk)->conn;
813 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
818 sco_pi(sk)->conn = NULL;
819 sco_conn_unlock(conn);
820 hci_conn_put(conn->hcon);
823 sk->sk_state = BT_CLOSED;
825 sk->sk_state_change(sk);
827 sock_set_flag(sk, SOCK_ZAPPED);
830 static void sco_conn_ready(struct sco_conn *conn)
832 struct sock *parent, *sk;
834 BT_DBG("conn %p", conn);
838 if ((sk = conn->sk)) {
839 sco_sock_clear_timer(sk);
841 sk->sk_state = BT_CONNECTED;
842 sk->sk_state_change(sk);
845 parent = sco_get_sock_listen(conn->src);
849 bh_lock_sock(parent);
851 sk = sco_sock_alloc(sock_net(parent), NULL,
852 BTPROTO_SCO, GFP_ATOMIC);
854 bh_unlock_sock(parent);
858 sco_sock_init(sk, parent);
860 bacpy(&bt_sk(sk)->src, conn->src);
861 bacpy(&bt_sk(sk)->dst, conn->dst);
863 hci_conn_hold(conn->hcon);
864 __sco_chan_add(conn, sk, parent);
866 sk->sk_state = BT_CONNECTED;
869 parent->sk_data_ready(parent, 1);
871 bh_unlock_sock(parent);
875 sco_conn_unlock(conn);
878 /* ----- SCO interface with lower layer (HCI) ----- */
879 static int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type)
881 register struct sock *sk;
882 struct hlist_node *node;
885 if (type != SCO_LINK && type != ESCO_LINK)
888 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
890 /* Find listening sockets */
891 read_lock(&sco_sk_list.lock);
892 sk_for_each(sk, node, &sco_sk_list.head) {
893 if (sk->sk_state != BT_LISTEN)
896 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr) ||
897 !bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
902 read_unlock(&sco_sk_list.lock);
907 static int sco_connect_cfm(struct hci_conn *hcon, __u8 status)
909 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
911 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
915 struct sco_conn *conn;
917 conn = sco_conn_add(hcon, status);
919 sco_conn_ready(conn);
921 sco_conn_del(hcon, bt_err(status));
926 static int sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
928 BT_DBG("hcon %p reason %d", hcon, reason);
930 if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
933 sco_conn_del(hcon, bt_err(reason));
938 static int sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
940 struct sco_conn *conn = hcon->sco_data;
945 BT_DBG("conn %p len %d", conn, skb->len);
948 sco_recv_frame(conn, skb);
957 static int sco_debugfs_show(struct seq_file *f, void *p)
960 struct hlist_node *node;
962 read_lock_bh(&sco_sk_list.lock);
964 sk_for_each(sk, node, &sco_sk_list.head) {
965 seq_printf(f, "%s %s %d\n", batostr(&bt_sk(sk)->src),
966 batostr(&bt_sk(sk)->dst), sk->sk_state);
969 read_unlock_bh(&sco_sk_list.lock);
974 static int sco_debugfs_open(struct inode *inode, struct file *file)
976 return single_open(file, sco_debugfs_show, inode->i_private);
979 static const struct file_operations sco_debugfs_fops = {
980 .open = sco_debugfs_open,
983 .release = single_release,
986 static struct dentry *sco_debugfs;
988 static const struct proto_ops sco_sock_ops = {
989 .family = PF_BLUETOOTH,
990 .owner = THIS_MODULE,
991 .release = sco_sock_release,
992 .bind = sco_sock_bind,
993 .connect = sco_sock_connect,
994 .listen = sco_sock_listen,
995 .accept = sco_sock_accept,
996 .getname = sco_sock_getname,
997 .sendmsg = sco_sock_sendmsg,
998 .recvmsg = bt_sock_recvmsg,
999 .poll = bt_sock_poll,
1000 .ioctl = bt_sock_ioctl,
1001 .mmap = sock_no_mmap,
1002 .socketpair = sock_no_socketpair,
1003 .shutdown = sco_sock_shutdown,
1004 .setsockopt = sco_sock_setsockopt,
1005 .getsockopt = sco_sock_getsockopt
1008 static const struct net_proto_family sco_sock_family_ops = {
1009 .family = PF_BLUETOOTH,
1010 .owner = THIS_MODULE,
1011 .create = sco_sock_create,
1014 static struct hci_proto sco_hci_proto = {
1016 .id = HCI_PROTO_SCO,
1017 .connect_ind = sco_connect_ind,
1018 .connect_cfm = sco_connect_cfm,
1019 .disconn_cfm = sco_disconn_cfm,
1020 .recv_scodata = sco_recv_scodata
1023 static int __init sco_init(void)
1027 err = proto_register(&sco_proto, 0);
1031 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1033 BT_ERR("SCO socket registration failed");
1037 err = hci_register_proto(&sco_hci_proto);
1039 BT_ERR("SCO protocol registration failed");
1040 bt_sock_unregister(BTPROTO_SCO);
1045 sco_debugfs = debugfs_create_file("sco", 0444,
1046 bt_debugfs, NULL, &sco_debugfs_fops);
1048 BT_ERR("Failed to create SCO debug file");
1051 BT_INFO("SCO (Voice Link) ver %s", VERSION);
1052 BT_INFO("SCO socket layer initialized");
1057 proto_unregister(&sco_proto);
1061 static void __exit sco_exit(void)
1063 debugfs_remove(sco_debugfs);
1065 if (bt_sock_unregister(BTPROTO_SCO) < 0)
1066 BT_ERR("SCO socket unregistration failed");
1068 if (hci_unregister_proto(&sco_hci_proto) < 0)
1069 BT_ERR("SCO protocol unregistration failed");
1071 proto_unregister(&sco_proto);
1074 module_init(sco_init);
1075 module_exit(sco_exit);
1077 module_param(disable_esco, bool, 0644);
1078 MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");
1080 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1081 MODULE_DESCRIPTION("Bluetooth SCO ver " VERSION);
1082 MODULE_VERSION(VERSION);
1083 MODULE_LICENSE("GPL");
1084 MODULE_ALIAS("bt-proto-2");