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);
163 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
164 bt_sk(sk)->parent = parent;
166 parent->sk_ack_backlog++;
168 EXPORT_SYMBOL(bt_accept_enqueue);
170 void bt_accept_unlink(struct sock *sk)
172 BT_DBG("sk %p state %d", sk, sk->sk_state);
174 list_del_init(&bt_sk(sk)->accept_q);
175 bt_sk(sk)->parent->sk_ack_backlog--;
176 bt_sk(sk)->parent = NULL;
179 EXPORT_SYMBOL(bt_accept_unlink);
181 struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
183 struct bt_sock *s, *n;
186 BT_DBG("parent %p", parent);
188 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
189 sk = (struct sock *)s;
193 /* FIXME: Is this check still needed */
194 if (sk->sk_state == BT_CLOSED) {
195 bt_accept_unlink(sk);
200 if (sk->sk_state == BT_CONNECTED || !newsock ||
201 test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags)) {
202 bt_accept_unlink(sk);
204 sock_graft(sk, newsock);
215 EXPORT_SYMBOL(bt_accept_dequeue);
217 int bt_sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
220 int noblock = flags & MSG_DONTWAIT;
221 struct sock *sk = sock->sk;
227 BT_DBG("sock %p sk %p len %zu", sock, sk, len);
232 skb = skb_recv_datagram(sk, flags, noblock, &err);
234 if (sk->sk_shutdown & RCV_SHUTDOWN)
243 msg->msg_flags |= MSG_TRUNC;
247 skb_reset_transport_header(skb);
248 err = skb_copy_datagram_msg(skb, 0, msg, copied);
250 sock_recv_ts_and_drops(msg, sk, skb);
252 if (msg->msg_name && bt_sk(sk)->skb_msg_name)
253 bt_sk(sk)->skb_msg_name(skb, msg->msg_name,
257 skb_free_datagram(sk, skb);
259 if (flags & MSG_TRUNC)
262 return err ? : copied;
264 EXPORT_SYMBOL(bt_sock_recvmsg);
266 static long bt_sock_data_wait(struct sock *sk, long timeo)
268 DECLARE_WAITQUEUE(wait, current);
270 add_wait_queue(sk_sleep(sk), &wait);
272 set_current_state(TASK_INTERRUPTIBLE);
274 if (!skb_queue_empty(&sk->sk_receive_queue))
277 if (sk->sk_err || (sk->sk_shutdown & RCV_SHUTDOWN))
280 if (signal_pending(current) || !timeo)
283 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
285 timeo = schedule_timeout(timeo);
287 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
290 __set_current_state(TASK_RUNNING);
291 remove_wait_queue(sk_sleep(sk), &wait);
295 int bt_sock_stream_recvmsg(struct socket *sock, struct msghdr *msg,
296 size_t size, int flags)
298 struct sock *sk = sock->sk;
300 size_t target, copied = 0;
306 BT_DBG("sk %p size %zu", sk, size);
310 target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
311 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
317 skb = skb_dequeue(&sk->sk_receive_queue);
319 if (copied >= target)
322 err = sock_error(sk);
325 if (sk->sk_shutdown & RCV_SHUTDOWN)
332 timeo = bt_sock_data_wait(sk, timeo);
334 if (signal_pending(current)) {
335 err = sock_intr_errno(timeo);
341 chunk = min_t(unsigned int, skb->len, size);
342 if (skb_copy_datagram_msg(skb, 0, msg, chunk)) {
343 skb_queue_head(&sk->sk_receive_queue, skb);
351 sock_recv_ts_and_drops(msg, sk, skb);
353 if (!(flags & MSG_PEEK)) {
354 int skb_len = skb_headlen(skb);
356 if (chunk <= skb_len) {
357 __skb_pull(skb, chunk);
359 struct sk_buff *frag;
361 __skb_pull(skb, skb_len);
364 skb_walk_frags(skb, frag) {
365 if (chunk <= frag->len) {
366 /* Pulling partial data */
368 skb->data_len -= chunk;
369 __skb_pull(frag, chunk);
371 } else if (frag->len) {
372 /* Pulling all frag data */
374 skb->len -= frag->len;
375 skb->data_len -= frag->len;
376 __skb_pull(frag, frag->len);
382 skb_queue_head(&sk->sk_receive_queue, skb);
388 /* put message back and return */
389 skb_queue_head(&sk->sk_receive_queue, skb);
396 return copied ? : err;
398 EXPORT_SYMBOL(bt_sock_stream_recvmsg);
400 static inline unsigned int bt_accept_poll(struct sock *parent)
402 struct bt_sock *s, *n;
405 list_for_each_entry_safe(s, n, &bt_sk(parent)->accept_q, accept_q) {
406 sk = (struct sock *)s;
407 if (sk->sk_state == BT_CONNECTED ||
408 (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags) &&
409 sk->sk_state == BT_CONNECT2))
410 return POLLIN | POLLRDNORM;
416 unsigned int bt_sock_poll(struct file *file, struct socket *sock,
419 struct sock *sk = sock->sk;
420 unsigned int mask = 0;
422 BT_DBG("sock %p, sk %p", sock, sk);
424 poll_wait(file, sk_sleep(sk), wait);
426 if (sk->sk_state == BT_LISTEN)
427 return bt_accept_poll(sk);
429 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
431 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
433 if (sk->sk_shutdown & RCV_SHUTDOWN)
434 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
436 if (sk->sk_shutdown == SHUTDOWN_MASK)
439 if (!skb_queue_empty(&sk->sk_receive_queue))
440 mask |= POLLIN | POLLRDNORM;
442 if (sk->sk_state == BT_CLOSED)
445 if (sk->sk_state == BT_CONNECT ||
446 sk->sk_state == BT_CONNECT2 ||
447 sk->sk_state == BT_CONFIG)
450 if (!test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags) && sock_writeable(sk))
451 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
453 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
457 EXPORT_SYMBOL(bt_sock_poll);
459 int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
461 struct sock *sk = sock->sk;
466 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
470 if (sk->sk_state == BT_LISTEN)
473 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
476 err = put_user(amount, (int __user *) arg);
480 if (sk->sk_state == BT_LISTEN)
484 skb = skb_peek(&sk->sk_receive_queue);
485 amount = skb ? skb->len : 0;
487 err = put_user(amount, (int __user *) arg);
491 err = sock_get_timestamp(sk, (struct timeval __user *) arg);
495 err = sock_get_timestampns(sk, (struct timespec __user *) arg);
505 EXPORT_SYMBOL(bt_sock_ioctl);
507 /* This function expects the sk lock to be held when called */
508 int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
510 DECLARE_WAITQUEUE(wait, current);
515 add_wait_queue(sk_sleep(sk), &wait);
516 set_current_state(TASK_INTERRUPTIBLE);
517 while (sk->sk_state != state) {
523 if (signal_pending(current)) {
524 err = sock_intr_errno(timeo);
529 timeo = schedule_timeout(timeo);
531 set_current_state(TASK_INTERRUPTIBLE);
533 err = sock_error(sk);
537 __set_current_state(TASK_RUNNING);
538 remove_wait_queue(sk_sleep(sk), &wait);
541 EXPORT_SYMBOL(bt_sock_wait_state);
543 /* This function expects the sk lock to be held when called */
544 int bt_sock_wait_ready(struct sock *sk, unsigned long flags)
546 DECLARE_WAITQUEUE(wait, current);
552 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
554 add_wait_queue(sk_sleep(sk), &wait);
555 set_current_state(TASK_INTERRUPTIBLE);
556 while (test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags)) {
562 if (signal_pending(current)) {
563 err = sock_intr_errno(timeo);
568 timeo = schedule_timeout(timeo);
570 set_current_state(TASK_INTERRUPTIBLE);
572 err = sock_error(sk);
576 __set_current_state(TASK_RUNNING);
577 remove_wait_queue(sk_sleep(sk), &wait);
581 EXPORT_SYMBOL(bt_sock_wait_ready);
583 #ifdef CONFIG_PROC_FS
584 struct bt_seq_state {
585 struct bt_sock_list *l;
588 static void *bt_seq_start(struct seq_file *seq, loff_t *pos)
589 __acquires(seq->private->l->lock)
591 struct bt_seq_state *s = seq->private;
592 struct bt_sock_list *l = s->l;
595 return seq_hlist_start_head(&l->head, *pos);
598 static void *bt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
600 struct bt_seq_state *s = seq->private;
601 struct bt_sock_list *l = s->l;
603 return seq_hlist_next(v, &l->head, pos);
606 static void bt_seq_stop(struct seq_file *seq, void *v)
607 __releases(seq->private->l->lock)
609 struct bt_seq_state *s = seq->private;
610 struct bt_sock_list *l = s->l;
612 read_unlock(&l->lock);
615 static int bt_seq_show(struct seq_file *seq, void *v)
617 struct bt_seq_state *s = seq->private;
618 struct bt_sock_list *l = s->l;
620 if (v == SEQ_START_TOKEN) {
621 seq_puts(seq ,"sk RefCnt Rmem Wmem User Inode Parent");
623 if (l->custom_seq_show) {
625 l->custom_seq_show(seq, v);
630 struct sock *sk = sk_entry(v);
631 struct bt_sock *bt = bt_sk(sk);
634 "%pK %-6d %-6u %-6u %-6u %-6lu %-6lu",
636 atomic_read(&sk->sk_refcnt),
637 sk_rmem_alloc_get(sk),
638 sk_wmem_alloc_get(sk),
639 from_kuid(seq_user_ns(seq), sock_i_uid(sk)),
641 bt->parent? sock_i_ino(bt->parent): 0LU);
643 if (l->custom_seq_show) {
645 l->custom_seq_show(seq, v);
653 static const struct seq_operations bt_seq_ops = {
654 .start = bt_seq_start,
660 static int bt_seq_open(struct inode *inode, struct file *file)
662 struct bt_sock_list *sk_list;
663 struct bt_seq_state *s;
665 sk_list = PDE_DATA(inode);
666 s = __seq_open_private(file, &bt_seq_ops,
667 sizeof(struct bt_seq_state));
675 static const struct file_operations bt_fops = {
679 .release = seq_release_private
682 int bt_procfs_init(struct net *net, const char *name,
683 struct bt_sock_list *sk_list,
684 int (* seq_show)(struct seq_file *, void *))
686 sk_list->custom_seq_show = seq_show;
688 if (!proc_create_data(name, 0, net->proc_net, &bt_fops, sk_list))
693 void bt_procfs_cleanup(struct net *net, const char *name)
695 remove_proc_entry(name, net->proc_net);
698 int bt_procfs_init(struct net *net, const char *name,
699 struct bt_sock_list *sk_list,
700 int (* seq_show)(struct seq_file *, void *))
705 void bt_procfs_cleanup(struct net *net, const char *name)
709 EXPORT_SYMBOL(bt_procfs_init);
710 EXPORT_SYMBOL(bt_procfs_cleanup);
712 static struct net_proto_family bt_sock_family_ops = {
713 .owner = THIS_MODULE,
714 .family = PF_BLUETOOTH,
715 .create = bt_sock_create,
718 struct dentry *bt_debugfs;
719 EXPORT_SYMBOL_GPL(bt_debugfs);
721 #define VERSION __stringify(BT_SUBSYS_VERSION) "." \
722 __stringify(BT_SUBSYS_REVISION)
724 static int __init bt_init(void)
728 sock_skb_cb_check_size(sizeof(struct bt_skb_cb));
730 BT_INFO("Core ver %s", VERSION);
736 bt_debugfs = debugfs_create_dir("bluetooth", NULL);
740 err = bt_sysfs_init();
744 err = sock_register(&bt_sock_family_ops);
750 BT_INFO("HCI device and connection manager initialized");
752 err = hci_sock_init();
779 sock_unregister(PF_BLUETOOTH);
785 static void __exit bt_exit(void)
795 sock_unregister(PF_BLUETOOTH);
801 debugfs_remove_recursive(bt_debugfs);
804 subsys_initcall(bt_init);
805 module_exit(bt_exit);
807 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
808 MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
809 MODULE_VERSION(VERSION);
810 MODULE_LICENSE("GPL");
811 MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);