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 address family and sockets. */
27 #include <linux/module.h>
28 #include <linux/debugfs.h>
29 #include <linux/stringify.h>
30 #include <linux/sched/signal.h>
32 #include <asm/ioctls.h>
34 #include <net/bluetooth/bluetooth.h>
35 #include <linux/proc_fs.h>
40 /* Bluetooth sockets */
41 #define BT_MAX_PROTO 8
42 static const struct net_proto_family *bt_proto[BT_MAX_PROTO];
43 static DEFINE_RWLOCK(bt_proto_lock);
45 static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
46 static const char *const bt_key_strings[BT_MAX_PROTO] = {
47 "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
48 "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
49 "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
50 "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
51 "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
52 "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
53 "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
54 "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
57 static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
58 static const char *const bt_slock_key_strings[BT_MAX_PROTO] = {
59 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
60 "slock-AF_BLUETOOTH-BTPROTO_HCI",
61 "slock-AF_BLUETOOTH-BTPROTO_SCO",
62 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
63 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
64 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
65 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
66 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
69 void bt_sock_reclassify_lock(struct sock *sk, int proto)
72 BUG_ON(!sock_allow_reclassification(sk));
74 sock_lock_init_class_and_name(sk,
75 bt_slock_key_strings[proto], &bt_slock_key[proto],
76 bt_key_strings[proto], &bt_lock_key[proto]);
78 EXPORT_SYMBOL(bt_sock_reclassify_lock);
80 int bt_sock_register(int proto, const struct net_proto_family *ops)
84 if (proto < 0 || proto >= BT_MAX_PROTO)
87 write_lock(&bt_proto_lock);
92 bt_proto[proto] = ops;
94 write_unlock(&bt_proto_lock);
98 EXPORT_SYMBOL(bt_sock_register);
100 void bt_sock_unregister(int proto)
102 if (proto < 0 || proto >= BT_MAX_PROTO)
105 write_lock(&bt_proto_lock);
106 bt_proto[proto] = NULL;
107 write_unlock(&bt_proto_lock);
109 EXPORT_SYMBOL(bt_sock_unregister);
111 static int bt_sock_create(struct net *net, struct socket *sock, int proto,
116 if (net != &init_net)
117 return -EAFNOSUPPORT;
119 if (proto < 0 || proto >= BT_MAX_PROTO)
122 if (!bt_proto[proto])
123 request_module("bt-proto-%d", proto);
125 err = -EPROTONOSUPPORT;
127 read_lock(&bt_proto_lock);
129 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
130 err = bt_proto[proto]->create(net, sock, proto, kern);
132 bt_sock_reclassify_lock(sock->sk, proto);
133 module_put(bt_proto[proto]->owner);
136 read_unlock(&bt_proto_lock);
141 void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
143 write_lock(&l->lock);
144 sk_add_node(sk, &l->head);
145 write_unlock(&l->lock);
147 EXPORT_SYMBOL(bt_sock_link);
149 void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
151 write_lock(&l->lock);
152 sk_del_node_init(sk);
153 write_unlock(&l->lock);
155 EXPORT_SYMBOL(bt_sock_unlink);
157 void bt_accept_enqueue(struct sock *parent, struct sock *sk)
159 BT_DBG("parent %p, sk %p", parent, sk);
162 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
163 bt_sk(sk)->parent = parent;
164 parent->sk_ack_backlog++;
166 EXPORT_SYMBOL(bt_accept_enqueue);
168 void bt_accept_unlink(struct sock *sk)
170 BT_DBG("sk %p state %d", sk, sk->sk_state);
172 list_del_init(&bt_sk(sk)->accept_q);
173 bt_sk(sk)->parent->sk_ack_backlog--;
174 bt_sk(sk)->parent = NULL;
177 EXPORT_SYMBOL(bt_accept_unlink);
179 struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
181 struct bt_sock *s, *n;
184 BT_DBG("parent %p", parent);
186 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
187 sk = (struct sock *)s;
191 /* FIXME: Is this check still needed */
192 if (sk->sk_state == BT_CLOSED) {
193 bt_accept_unlink(sk);
198 if (sk->sk_state == BT_CONNECTED || !newsock ||
199 test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) {
200 bt_accept_unlink(sk);
202 sock_graft(sk, newsock);
213 EXPORT_SYMBOL(bt_accept_dequeue);
215 int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
218 int noblock = flags & MSG_DONTWAIT;
219 struct sock *sk = sock->sk;
225 BT_DBG("sock %p sk %p len %zu", sock, sk, len);
230 skb = skb_recv_datagram(sk, flags, noblock, &err);
232 if (sk->sk_shutdown & RCV_SHUTDOWN)
241 msg->msg_flags |= MSG_TRUNC;
245 skb_reset_transport_header(skb);
246 err = skb_copy_datagram_msg(skb, 0, msg, copied);
248 sock_recv_ts_and_drops(msg, sk, skb);
250 if (msg->msg_name && bt_sk(sk)->skb_msg_name)
251 bt_sk(sk)->skb_msg_name(skb, msg->msg_name,
255 skb_free_datagram(sk, skb);
257 if (flags & MSG_TRUNC)
260 return err ? : copied;
262 EXPORT_SYMBOL(bt_sock_recvmsg);
264 static long bt_sock_data_wait(struct sock *sk, long timeo)
266 DECLARE_WAITQUEUE(wait, current);
268 add_wait_queue(sk_sleep(sk), &wait);
270 set_current_state(TASK_INTERRUPTIBLE);
272 if (!skb_queue_empty(&sk->sk_receive_queue))
275 if (sk->sk_err || (sk->sk_shutdown & RCV_SHUTDOWN))
278 if (signal_pending(current) || !timeo)
281 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
283 timeo = schedule_timeout(timeo);
285 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
288 __set_current_state(TASK_RUNNING);
289 remove_wait_queue(sk_sleep(sk), &wait);
293 int bt_sock_stream_recvmsg(struct socket *sock, struct msghdr *msg,
294 size_t size, int flags)
296 struct sock *sk = sock->sk;
298 size_t target, copied = 0;
304 BT_DBG("sk %p size %zu", sk, size);
308 target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
309 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
315 skb = skb_dequeue(&sk->sk_receive_queue);
317 if (copied >= target)
320 err = sock_error(sk);
323 if (sk->sk_shutdown & RCV_SHUTDOWN)
330 timeo = bt_sock_data_wait(sk, timeo);
332 if (signal_pending(current)) {
333 err = sock_intr_errno(timeo);
339 chunk = min_t(unsigned int, skb->len, size);
340 if (skb_copy_datagram_msg(skb, 0, msg, chunk)) {
341 skb_queue_head(&sk->sk_receive_queue, skb);
349 sock_recv_ts_and_drops(msg, sk, skb);
351 if (!(flags & MSG_PEEK)) {
352 int skb_len = skb_headlen(skb);
354 if (chunk <= skb_len) {
355 __skb_pull(skb, chunk);
357 struct sk_buff *frag;
359 __skb_pull(skb, skb_len);
362 skb_walk_frags(skb, frag) {
363 if (chunk <= frag->len) {
364 /* Pulling partial data */
366 skb->data_len -= chunk;
367 __skb_pull(frag, chunk);
369 } else if (frag->len) {
370 /* Pulling all frag data */
372 skb->len -= frag->len;
373 skb->data_len -= frag->len;
374 __skb_pull(frag, frag->len);
380 skb_queue_head(&sk->sk_receive_queue, skb);
386 /* put message back and return */
387 skb_queue_head(&sk->sk_receive_queue, skb);
394 return copied ? : err;
396 EXPORT_SYMBOL(bt_sock_stream_recvmsg);
398 static inline unsigned int bt_accept_poll(struct sock *parent)
400 struct bt_sock *s, *n;
403 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
404 sk = (struct sock *)s;
405 if (sk->sk_state == BT_CONNECTED ||
406 (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags) &&
407 sk->sk_state == BT_CONNECT2))
408 return POLLIN | POLLRDNORM;
414 unsigned int bt_sock_poll(struct file *file, struct socket *sock,
417 struct sock *sk = sock->sk;
418 unsigned int mask = 0;
420 BT_DBG("sock %p, sk %p", sock, sk);
422 poll_wait(file, sk_sleep(sk), wait);
424 if (sk->sk_state == BT_LISTEN)
425 return bt_accept_poll(sk);
427 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
429 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
431 if (sk->sk_shutdown & RCV_SHUTDOWN)
432 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
434 if (sk->sk_shutdown == SHUTDOWN_MASK)
437 if (!skb_queue_empty(&sk->sk_receive_queue))
438 mask |= POLLIN | POLLRDNORM;
440 if (sk->sk_state == BT_CLOSED)
443 if (sk->sk_state == BT_CONNECT ||
444 sk->sk_state == BT_CONNECT2 ||
445 sk->sk_state == BT_CONFIG)
448 if (!test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags) && sock_writeable(sk))
449 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
451 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
455 EXPORT_SYMBOL(bt_sock_poll);
457 int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
459 struct sock *sk = sock->sk;
464 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
468 if (sk->sk_state == BT_LISTEN)
471 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
474 err = put_user(amount, (int __user *) arg);
478 if (sk->sk_state == BT_LISTEN)
482 skb = skb_peek(&sk->sk_receive_queue);
483 amount = skb ? skb->len : 0;
485 err = put_user(amount, (int __user *) arg);
489 err = sock_get_timestamp(sk, (struct timeval __user *) arg);
493 err = sock_get_timestampns(sk, (struct timespec __user *) arg);
503 EXPORT_SYMBOL(bt_sock_ioctl);
505 /* This function expects the sk lock to be held when called */
506 int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
508 DECLARE_WAITQUEUE(wait, current);
513 add_wait_queue(sk_sleep(sk), &wait);
514 set_current_state(TASK_INTERRUPTIBLE);
515 while (sk->sk_state != state) {
521 if (signal_pending(current)) {
522 err = sock_intr_errno(timeo);
527 timeo = schedule_timeout(timeo);
529 set_current_state(TASK_INTERRUPTIBLE);
531 err = sock_error(sk);
535 __set_current_state(TASK_RUNNING);
536 remove_wait_queue(sk_sleep(sk), &wait);
539 EXPORT_SYMBOL(bt_sock_wait_state);
541 /* This function expects the sk lock to be held when called */
542 int bt_sock_wait_ready(struct sock *sk, unsigned long flags)
544 DECLARE_WAITQUEUE(wait, current);
550 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
552 add_wait_queue(sk_sleep(sk), &wait);
553 set_current_state(TASK_INTERRUPTIBLE);
554 while (test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags)) {
560 if (signal_pending(current)) {
561 err = sock_intr_errno(timeo);
566 timeo = schedule_timeout(timeo);
568 set_current_state(TASK_INTERRUPTIBLE);
570 err = sock_error(sk);
574 __set_current_state(TASK_RUNNING);
575 remove_wait_queue(sk_sleep(sk), &wait);
579 EXPORT_SYMBOL(bt_sock_wait_ready);
581 #ifdef CONFIG_PROC_FS
582 struct bt_seq_state {
583 struct bt_sock_list *l;
586 static void *bt_seq_start(struct seq_file *seq, loff_t *pos)
587 __acquires(seq->private->l->lock)
589 struct bt_seq_state *s = seq->private;
590 struct bt_sock_list *l = s->l;
593 return seq_hlist_start_head(&l->head, *pos);
596 static void *bt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
598 struct bt_seq_state *s = seq->private;
599 struct bt_sock_list *l = s->l;
601 return seq_hlist_next(v, &l->head, pos);
604 static void bt_seq_stop(struct seq_file *seq, void *v)
605 __releases(seq->private->l->lock)
607 struct bt_seq_state *s = seq->private;
608 struct bt_sock_list *l = s->l;
610 read_unlock(&l->lock);
613 static int bt_seq_show(struct seq_file *seq, void *v)
615 struct bt_seq_state *s = seq->private;
616 struct bt_sock_list *l = s->l;
618 if (v == SEQ_START_TOKEN) {
619 seq_puts(seq ,"sk RefCnt Rmem Wmem User Inode Parent");
621 if (l->custom_seq_show) {
623 l->custom_seq_show(seq, v);
628 struct sock *sk = sk_entry(v);
629 struct bt_sock *bt = bt_sk(sk);
632 "%pK %-6d %-6u %-6u %-6u %-6lu %-6lu",
634 atomic_read(&sk->sk_refcnt),
635 sk_rmem_alloc_get(sk),
636 sk_wmem_alloc_get(sk),
637 from_kuid(seq_user_ns(seq), sock_i_uid(sk)),
639 bt->parent? sock_i_ino(bt->parent): 0LU);
641 if (l->custom_seq_show) {
643 l->custom_seq_show(seq, v);
651 static const struct seq_operations bt_seq_ops = {
652 .start = bt_seq_start,
658 static int bt_seq_open(struct inode *inode, struct file *file)
660 struct bt_sock_list *sk_list;
661 struct bt_seq_state *s;
663 sk_list = PDE_DATA(inode);
664 s = __seq_open_private(file, &bt_seq_ops,
665 sizeof(struct bt_seq_state));
673 static const struct file_operations bt_fops = {
677 .release = seq_release_private
680 int bt_procfs_init(struct net *net, const char *name,
681 struct bt_sock_list *sk_list,
682 int (* seq_show)(struct seq_file *, void *))
684 sk_list->custom_seq_show = seq_show;
686 if (!proc_create_data(name, 0, net->proc_net, &bt_fops, sk_list))
691 void bt_procfs_cleanup(struct net *net, const char *name)
693 remove_proc_entry(name, net->proc_net);
696 int bt_procfs_init(struct net *net, const char *name,
697 struct bt_sock_list *sk_list,
698 int (* seq_show)(struct seq_file *, void *))
703 void bt_procfs_cleanup(struct net *net, const char *name)
707 EXPORT_SYMBOL(bt_procfs_init);
708 EXPORT_SYMBOL(bt_procfs_cleanup);
710 static struct net_proto_family bt_sock_family_ops = {
711 .owner = THIS_MODULE,
712 .family = PF_BLUETOOTH,
713 .create = bt_sock_create,
716 struct dentry *bt_debugfs;
717 EXPORT_SYMBOL_GPL(bt_debugfs);
719 #define VERSION __stringify(BT_SUBSYS_VERSION) "." \
720 __stringify(BT_SUBSYS_REVISION)
722 static int __init bt_init(void)
726 sock_skb_cb_check_size(sizeof(struct bt_skb_cb));
728 BT_INFO("Core ver %s", VERSION);
734 bt_debugfs = debugfs_create_dir("bluetooth", NULL);
738 err = bt_sysfs_init();
742 err = sock_register(&bt_sock_family_ops);
748 BT_INFO("HCI device and connection manager initialized");
750 err = hci_sock_init();
777 sock_unregister(PF_BLUETOOTH);
783 static void __exit bt_exit(void)
793 sock_unregister(PF_BLUETOOTH);
799 debugfs_remove_recursive(bt_debugfs);
802 subsys_initcall(bt_init);
803 module_exit(bt_exit);
805 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
806 MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
807 MODULE_VERSION(VERSION);
808 MODULE_LICENSE("GPL");
809 MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);