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/config.h>
28 #include <linux/module.h>
30 #include <linux/types.h>
31 #include <linux/errno.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/slab.h>
35 #include <linux/poll.h>
36 #include <linux/fcntl.h>
37 #include <linux/init.h>
38 #include <linux/interrupt.h>
39 #include <linux/socket.h>
40 #include <linux/skbuff.h>
41 #include <linux/proc_fs.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>
53 #ifndef CONFIG_BT_SCO_DEBUG
60 static struct proto_ops sco_sock_ops;
62 static struct bt_sock_list sco_sk_list = {
63 .lock = RW_LOCK_UNLOCKED
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 static void sco_sock_init_timer(struct sock *sk)
104 init_timer(&sk->sk_timer);
105 sk->sk_timer.function = sco_sock_timeout;
106 sk->sk_timer.data = (unsigned long)sk;
109 /* ---- SCO connections ---- */
110 static struct sco_conn *sco_conn_add(struct hci_conn *hcon, __u8 status)
112 struct hci_dev *hdev = hcon->hdev;
113 struct sco_conn *conn;
115 if ((conn = hcon->sco_data))
121 if (!(conn = kmalloc(sizeof(struct sco_conn), GFP_ATOMIC)))
123 memset(conn, 0, sizeof(struct sco_conn));
125 spin_lock_init(&conn->lock);
127 hcon->sco_data = conn;
130 conn->src = &hdev->bdaddr;
131 conn->dst = &hcon->dst;
133 if (hdev->sco_mtu > 0)
134 conn->mtu = hdev->sco_mtu;
138 BT_DBG("hcon %p conn %p", hcon, conn);
142 static inline struct sock *sco_chan_get(struct sco_conn *conn)
144 struct sock *sk = NULL;
147 sco_conn_unlock(conn);
151 static int sco_conn_del(struct hci_conn *hcon, int err)
153 struct sco_conn *conn;
156 if (!(conn = hcon->sco_data))
159 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
162 if ((sk = sco_chan_get(conn))) {
164 sco_sock_clear_timer(sk);
165 sco_chan_del(sk, err);
170 hcon->sco_data = NULL;
175 static inline int sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
183 __sco_chan_add(conn, sk, parent);
185 sco_conn_unlock(conn);
189 static int sco_connect(struct sock *sk)
191 bdaddr_t *src = &bt_sk(sk)->src;
192 bdaddr_t *dst = &bt_sk(sk)->dst;
193 struct sco_conn *conn;
194 struct hci_conn *hcon;
195 struct hci_dev *hdev;
198 BT_DBG("%s -> %s", batostr(src), batostr(dst));
200 if (!(hdev = hci_get_route(dst, src)))
201 return -EHOSTUNREACH;
203 hci_dev_lock_bh(hdev);
207 hcon = hci_connect(hdev, SCO_LINK, dst);
211 conn = sco_conn_add(hcon, 0);
217 /* Update source addr of the socket */
218 bacpy(src, conn->src);
220 err = sco_chan_add(conn, sk, NULL);
224 if (hcon->state == BT_CONNECTED) {
225 sco_sock_clear_timer(sk);
226 sk->sk_state = BT_CONNECTED;
228 sk->sk_state = BT_CONNECT;
229 sco_sock_set_timer(sk, sk->sk_sndtimeo);
232 hci_dev_unlock_bh(hdev);
237 static inline int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
239 struct sco_conn *conn = sco_pi(sk)->conn;
243 /* Check outgoing MTU */
247 BT_DBG("sk %p len %d", sk, len);
249 count = min_t(unsigned int, conn->mtu, len);
250 if (!(skb = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err)))
253 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
258 if ((err = hci_send_sco(conn->hcon, skb)) < 0)
268 static inline void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
270 struct sock *sk = sco_chan_get(conn);
275 BT_DBG("sk %p len %d", sk, skb->len);
277 if (sk->sk_state != BT_CONNECTED)
280 if (!sock_queue_rcv_skb(sk, skb))
288 /* -------- Socket interface ---------- */
289 static struct sock *__sco_get_sock_by_addr(bdaddr_t *ba)
292 struct hlist_node *node;
294 sk_for_each(sk, node, &sco_sk_list.head)
295 if (!bacmp(&bt_sk(sk)->src, ba))
302 /* Find socket listening on source bdaddr.
303 * Returns closest match.
305 static struct sock *sco_get_sock_listen(bdaddr_t *src)
307 struct sock *sk = NULL, *sk1 = NULL;
308 struct hlist_node *node;
310 read_lock(&sco_sk_list.lock);
312 sk_for_each(sk, node, &sco_sk_list.head) {
313 if (sk->sk_state != BT_LISTEN)
317 if (!bacmp(&bt_sk(sk)->src, src))
321 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
325 read_unlock(&sco_sk_list.lock);
327 return node ? sk : sk1;
330 static void sco_sock_destruct(struct sock *sk)
334 skb_queue_purge(&sk->sk_receive_queue);
335 skb_queue_purge(&sk->sk_write_queue);
338 static void sco_sock_cleanup_listen(struct sock *parent)
342 BT_DBG("parent %p", parent);
344 /* Close not yet accepted channels */
345 while ((sk = bt_accept_dequeue(parent, NULL))) {
350 parent->sk_state = BT_CLOSED;
351 sock_set_flag(parent, SOCK_ZAPPED);
354 /* Kill socket (only if zapped and orphan)
355 * Must be called on unlocked socket.
357 static void sco_sock_kill(struct sock *sk)
359 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
362 BT_DBG("sk %p state %d", sk, sk->sk_state);
364 /* Kill poor orphan */
365 bt_sock_unlink(&sco_sk_list, sk);
366 sock_set_flag(sk, SOCK_DEAD);
371 * Must be called on unlocked socket.
373 static void sco_sock_close(struct sock *sk)
375 struct sco_conn *conn;
377 sco_sock_clear_timer(sk);
381 conn = sco_pi(sk)->conn;
383 BT_DBG("sk %p state %d conn %p socket %p", sk, sk->sk_state, conn, sk->sk_socket);
385 switch (sk->sk_state) {
387 sco_sock_cleanup_listen(sk);
394 sco_chan_del(sk, ECONNRESET);
398 sock_set_flag(sk, SOCK_ZAPPED);
407 static void sco_sock_init(struct sock *sk, struct sock *parent)
412 sk->sk_type = parent->sk_type;
415 static struct proto sco_proto = {
417 .owner = THIS_MODULE,
418 .obj_size = sizeof(struct sco_pinfo)
421 static struct sock *sco_sock_alloc(struct socket *sock, int proto, unsigned int __nocast prio)
425 sk = sk_alloc(PF_BLUETOOTH, prio, &sco_proto, 1);
429 sock_init_data(sock, sk);
430 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
432 sk->sk_destruct = sco_sock_destruct;
433 sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
435 sock_reset_flag(sk, SOCK_ZAPPED);
437 sk->sk_protocol = proto;
438 sk->sk_state = BT_OPEN;
440 sco_sock_init_timer(sk);
442 bt_sock_link(&sco_sk_list, sk);
446 static int sco_sock_create(struct socket *sock, int protocol)
450 BT_DBG("sock %p", sock);
452 sock->state = SS_UNCONNECTED;
454 if (sock->type != SOCK_SEQPACKET)
455 return -ESOCKTNOSUPPORT;
457 sock->ops = &sco_sock_ops;
459 if (!(sk = sco_sock_alloc(sock, protocol, GFP_KERNEL)))
462 sco_sock_init(sk, NULL);
466 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
468 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
469 struct sock *sk = sock->sk;
470 bdaddr_t *src = &sa->sco_bdaddr;
473 BT_DBG("sk %p %s", sk, batostr(&sa->sco_bdaddr));
475 if (!addr || addr->sa_family != AF_BLUETOOTH)
480 if (sk->sk_state != BT_OPEN) {
485 write_lock_bh(&sco_sk_list.lock);
487 if (bacmp(src, BDADDR_ANY) && __sco_get_sock_by_addr(src)) {
490 /* Save source address */
491 bacpy(&bt_sk(sk)->src, &sa->sco_bdaddr);
492 sk->sk_state = BT_BOUND;
495 write_unlock_bh(&sco_sk_list.lock);
502 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
504 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
505 struct sock *sk = sock->sk;
511 if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_sco))
514 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
517 if (sk->sk_type != SOCK_SEQPACKET)
522 /* Set destination address and psm */
523 bacpy(&bt_sk(sk)->dst, &sa->sco_bdaddr);
525 if ((err = sco_connect(sk)))
528 err = bt_sock_wait_state(sk, BT_CONNECTED,
529 sock_sndtimeo(sk, flags & O_NONBLOCK));
536 static int sco_sock_listen(struct socket *sock, int backlog)
538 struct sock *sk = sock->sk;
541 BT_DBG("sk %p backlog %d", sk, backlog);
545 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
550 sk->sk_max_ack_backlog = backlog;
551 sk->sk_ack_backlog = 0;
552 sk->sk_state = BT_LISTEN;
559 static int sco_sock_accept(struct socket *sock, struct socket *newsock, int flags)
561 DECLARE_WAITQUEUE(wait, current);
562 struct sock *sk = sock->sk, *ch;
568 if (sk->sk_state != BT_LISTEN) {
573 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
575 BT_DBG("sk %p timeo %ld", sk, timeo);
577 /* Wait for an incoming connection. (wake-one). */
578 add_wait_queue_exclusive(sk->sk_sleep, &wait);
579 while (!(ch = bt_accept_dequeue(sk, newsock))) {
580 set_current_state(TASK_INTERRUPTIBLE);
587 timeo = schedule_timeout(timeo);
590 if (sk->sk_state != BT_LISTEN) {
595 if (signal_pending(current)) {
596 err = sock_intr_errno(timeo);
600 set_current_state(TASK_RUNNING);
601 remove_wait_queue(sk->sk_sleep, &wait);
606 newsock->state = SS_CONNECTED;
608 BT_DBG("new socket %p", ch);
615 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
617 struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
618 struct sock *sk = sock->sk;
620 BT_DBG("sock %p, sk %p", sock, sk);
622 addr->sa_family = AF_BLUETOOTH;
623 *len = sizeof(struct sockaddr_sco);
626 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->dst);
628 bacpy(&sa->sco_bdaddr, &bt_sk(sk)->src);
633 static int sco_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
634 struct msghdr *msg, size_t len)
636 struct sock *sk = sock->sk;
639 BT_DBG("sock %p, sk %p", sock, sk);
642 return sock_error(sk);
644 if (msg->msg_flags & MSG_OOB)
649 if (sk->sk_state == BT_CONNECTED)
650 err = sco_send_frame(sk, msg, len);
658 static int sco_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
660 struct sock *sk = sock->sk;
677 static int sco_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
679 struct sock *sk = sock->sk;
680 struct sco_options opts;
681 struct sco_conninfo cinfo;
686 if (get_user(len, optlen))
693 if (sk->sk_state != BT_CONNECTED) {
698 opts.mtu = sco_pi(sk)->conn->mtu;
700 BT_DBG("mtu %d", opts.mtu);
702 len = min_t(unsigned int, len, sizeof(opts));
703 if (copy_to_user(optval, (char *)&opts, len))
709 if (sk->sk_state != BT_CONNECTED) {
714 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
715 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
717 len = min_t(unsigned int, len, sizeof(cinfo));
718 if (copy_to_user(optval, (char *)&cinfo, len))
732 static int sco_sock_release(struct socket *sock)
734 struct sock *sk = sock->sk;
737 BT_DBG("sock %p, sk %p", sock, sk);
744 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) {
746 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
755 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk, struct sock *parent)
757 BT_DBG("conn %p", conn);
759 sco_pi(sk)->conn = conn;
763 bt_accept_enqueue(parent, sk);
767 * Must be called on the locked socket. */
768 static void sco_chan_del(struct sock *sk, int err)
770 struct sco_conn *conn;
772 conn = sco_pi(sk)->conn;
774 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
779 sco_pi(sk)->conn = NULL;
780 sco_conn_unlock(conn);
781 hci_conn_put(conn->hcon);
784 sk->sk_state = BT_CLOSED;
786 sk->sk_state_change(sk);
788 sock_set_flag(sk, SOCK_ZAPPED);
791 static void sco_conn_ready(struct sco_conn *conn)
793 struct sock *parent, *sk;
795 BT_DBG("conn %p", conn);
799 if ((sk = conn->sk)) {
800 sco_sock_clear_timer(sk);
802 sk->sk_state = BT_CONNECTED;
803 sk->sk_state_change(sk);
806 parent = sco_get_sock_listen(conn->src);
810 bh_lock_sock(parent);
812 sk = sco_sock_alloc(NULL, BTPROTO_SCO, GFP_ATOMIC);
814 bh_unlock_sock(parent);
818 sco_sock_init(sk, parent);
820 bacpy(&bt_sk(sk)->src, conn->src);
821 bacpy(&bt_sk(sk)->dst, conn->dst);
823 hci_conn_hold(conn->hcon);
824 __sco_chan_add(conn, sk, parent);
826 sk->sk_state = BT_CONNECTED;
829 parent->sk_data_ready(parent, 1);
831 bh_unlock_sock(parent);
835 sco_conn_unlock(conn);
838 /* ----- SCO interface with lower layer (HCI) ----- */
839 static int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 type)
841 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
843 /* Always accept connection */
844 return HCI_LM_ACCEPT;
847 static int sco_connect_cfm(struct hci_conn *hcon, __u8 status)
849 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
851 if (hcon->type != SCO_LINK)
855 struct sco_conn *conn;
857 conn = sco_conn_add(hcon, status);
859 sco_conn_ready(conn);
861 sco_conn_del(hcon, bt_err(status));
866 static int sco_disconn_ind(struct hci_conn *hcon, __u8 reason)
868 BT_DBG("hcon %p reason %d", hcon, reason);
870 if (hcon->type != SCO_LINK)
873 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 /* ---- Proc fs support ---- */
897 #ifdef CONFIG_PROC_FS
898 static void *sco_seq_start(struct seq_file *seq, loff_t *pos)
901 struct hlist_node *node;
904 read_lock_bh(&sco_sk_list.lock);
906 sk_for_each(sk, node, &sco_sk_list.head)
914 static void *sco_seq_next(struct seq_file *seq, void *e, loff_t *pos)
921 static void sco_seq_stop(struct seq_file *seq, void *e)
923 read_unlock_bh(&sco_sk_list.lock);
926 static int sco_seq_show(struct seq_file *seq, void *e)
929 seq_printf(seq, "%s %s %d\n",
930 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), sk->sk_state);
934 static struct seq_operations sco_seq_ops = {
935 .start = sco_seq_start,
936 .next = sco_seq_next,
937 .stop = sco_seq_stop,
941 static int sco_seq_open(struct inode *inode, struct file *file)
943 return seq_open(file, &sco_seq_ops);
946 static struct file_operations sco_seq_fops = {
947 .owner = THIS_MODULE,
948 .open = sco_seq_open,
951 .release = seq_release,
954 static int __init sco_proc_init(void)
956 struct proc_dir_entry *p = create_proc_entry("sco", S_IRUGO, proc_bt);
959 p->owner = THIS_MODULE;
960 p->proc_fops = &sco_seq_fops;
964 static void __exit sco_proc_cleanup(void)
966 remove_proc_entry("sco", proc_bt);
969 #else /* CONFIG_PROC_FS */
971 static int __init sco_proc_init(void)
976 static void __exit sco_proc_cleanup(void)
980 #endif /* CONFIG_PROC_FS */
982 static struct proto_ops sco_sock_ops = {
983 .family = PF_BLUETOOTH,
984 .owner = THIS_MODULE,
985 .release = sco_sock_release,
986 .bind = sco_sock_bind,
987 .connect = sco_sock_connect,
988 .listen = sco_sock_listen,
989 .accept = sco_sock_accept,
990 .getname = sco_sock_getname,
991 .sendmsg = sco_sock_sendmsg,
992 .recvmsg = bt_sock_recvmsg,
993 .poll = bt_sock_poll,
994 .ioctl = sock_no_ioctl,
995 .mmap = sock_no_mmap,
996 .socketpair = sock_no_socketpair,
997 .shutdown = sock_no_shutdown,
998 .setsockopt = sco_sock_setsockopt,
999 .getsockopt = sco_sock_getsockopt
1002 static struct net_proto_family sco_sock_family_ops = {
1003 .family = PF_BLUETOOTH,
1004 .owner = THIS_MODULE,
1005 .create = sco_sock_create,
1008 static struct hci_proto sco_hci_proto = {
1010 .id = HCI_PROTO_SCO,
1011 .connect_ind = sco_connect_ind,
1012 .connect_cfm = sco_connect_cfm,
1013 .disconn_ind = sco_disconn_ind,
1014 .recv_scodata = sco_recv_scodata
1017 static int __init sco_init(void)
1021 err = proto_register(&sco_proto, 0);
1025 err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1027 BT_ERR("SCO socket registration failed");
1031 err = hci_register_proto(&sco_hci_proto);
1033 BT_ERR("SCO protocol registration failed");
1034 bt_sock_unregister(BTPROTO_SCO);
1040 BT_INFO("SCO (Voice Link) ver %s", VERSION);
1041 BT_INFO("SCO socket layer initialized");
1046 proto_unregister(&sco_proto);
1050 static void __exit sco_exit(void)
1054 if (bt_sock_unregister(BTPROTO_SCO) < 0)
1055 BT_ERR("SCO socket unregistration failed");
1057 if (hci_unregister_proto(&sco_hci_proto) < 0)
1058 BT_ERR("SCO protocol unregistration failed");
1060 proto_unregister(&sco_proto);
1063 module_init(sco_init);
1064 module_exit(sco_exit);
1066 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
1067 MODULE_DESCRIPTION("Bluetooth SCO ver " VERSION);
1068 MODULE_VERSION(VERSION);
1069 MODULE_LICENSE("GPL");
1070 MODULE_ALIAS("bt-proto-2");