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>
29 #include <linux/types.h>
30 #include <linux/list.h>
31 #include <linux/errno.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/skbuff.h>
35 #include <linux/init.h>
36 #include <linux/poll.h>
38 #include <asm/ioctls.h>
39 #include <linux/kmod.h>
41 #include <net/bluetooth/bluetooth.h>
43 #define VERSION "2.16"
45 /* Bluetooth sockets */
46 #define BT_MAX_PROTO 8
47 static const struct net_proto_family *bt_proto[BT_MAX_PROTO];
48 static DEFINE_RWLOCK(bt_proto_lock);
50 static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
51 static const char *const bt_key_strings[BT_MAX_PROTO] = {
52 "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
53 "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
54 "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
55 "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
56 "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
57 "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
58 "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
59 "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
62 static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
63 static const char *const bt_slock_key_strings[BT_MAX_PROTO] = {
64 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
65 "slock-AF_BLUETOOTH-BTPROTO_HCI",
66 "slock-AF_BLUETOOTH-BTPROTO_SCO",
67 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
68 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
69 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
70 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
71 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
74 void bt_sock_reclassify_lock(struct sock *sk, int proto)
77 BUG_ON(sock_owned_by_user(sk));
79 sock_lock_init_class_and_name(sk,
80 bt_slock_key_strings[proto], &bt_slock_key[proto],
81 bt_key_strings[proto], &bt_lock_key[proto]);
83 EXPORT_SYMBOL(bt_sock_reclassify_lock);
85 int bt_sock_register(int proto, const struct net_proto_family *ops)
89 if (proto < 0 || proto >= BT_MAX_PROTO)
92 write_lock(&bt_proto_lock);
97 bt_proto[proto] = ops;
99 write_unlock(&bt_proto_lock);
103 EXPORT_SYMBOL(bt_sock_register);
105 int bt_sock_unregister(int proto)
109 if (proto < 0 || proto >= BT_MAX_PROTO)
112 write_lock(&bt_proto_lock);
114 if (!bt_proto[proto])
117 bt_proto[proto] = NULL;
119 write_unlock(&bt_proto_lock);
123 EXPORT_SYMBOL(bt_sock_unregister);
125 static int bt_sock_create(struct net *net, struct socket *sock, int proto,
130 if (net != &init_net)
131 return -EAFNOSUPPORT;
133 if (proto < 0 || proto >= BT_MAX_PROTO)
136 if (!bt_proto[proto])
137 request_module("bt-proto-%d", proto);
139 err = -EPROTONOSUPPORT;
141 read_lock(&bt_proto_lock);
143 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
144 err = bt_proto[proto]->create(net, sock, proto, kern);
146 bt_sock_reclassify_lock(sock->sk, proto);
147 module_put(bt_proto[proto]->owner);
150 read_unlock(&bt_proto_lock);
155 void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
157 write_lock(&l->lock);
158 sk_add_node(sk, &l->head);
159 write_unlock(&l->lock);
161 EXPORT_SYMBOL(bt_sock_link);
163 void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
165 write_lock(&l->lock);
166 sk_del_node_init(sk);
167 write_unlock(&l->lock);
169 EXPORT_SYMBOL(bt_sock_unlink);
171 void bt_accept_enqueue(struct sock *parent, struct sock *sk)
173 BT_DBG("parent %p, sk %p", parent, sk);
176 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
177 bt_sk(sk)->parent = parent;
178 parent->sk_ack_backlog++;
180 EXPORT_SYMBOL(bt_accept_enqueue);
182 void bt_accept_unlink(struct sock *sk)
184 BT_DBG("sk %p state %d", sk, sk->sk_state);
186 list_del_init(&bt_sk(sk)->accept_q);
187 bt_sk(sk)->parent->sk_ack_backlog--;
188 bt_sk(sk)->parent = NULL;
191 EXPORT_SYMBOL(bt_accept_unlink);
193 struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
195 struct list_head *p, *n;
198 BT_DBG("parent %p", parent);
200 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
201 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
205 /* FIXME: Is this check still needed */
206 if (sk->sk_state == BT_CLOSED) {
208 bt_accept_unlink(sk);
212 if (sk->sk_state == BT_CONNECTED || !newsock ||
213 test_bit(BT_DEFER_SETUP, &bt_sk(parent)->flags)) {
214 bt_accept_unlink(sk);
216 sock_graft(sk, newsock);
227 EXPORT_SYMBOL(bt_accept_dequeue);
229 int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
230 struct msghdr *msg, size_t len, int flags)
232 int noblock = flags & MSG_DONTWAIT;
233 struct sock *sk = sock->sk;
238 BT_DBG("sock %p sk %p len %zu", sock, sk, len);
240 if (flags & (MSG_OOB))
243 skb = skb_recv_datagram(sk, flags, noblock, &err);
245 if (sk->sk_shutdown & RCV_SHUTDOWN)
250 msg->msg_namelen = 0;
254 msg->msg_flags |= MSG_TRUNC;
258 skb_reset_transport_header(skb);
259 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
261 sock_recv_ts_and_drops(msg, sk, skb);
263 skb_free_datagram(sk, skb);
265 return err ? : copied;
267 EXPORT_SYMBOL(bt_sock_recvmsg);
269 static long bt_sock_data_wait(struct sock *sk, long timeo)
271 DECLARE_WAITQUEUE(wait, current);
273 add_wait_queue(sk_sleep(sk), &wait);
275 set_current_state(TASK_INTERRUPTIBLE);
277 if (!skb_queue_empty(&sk->sk_receive_queue))
280 if (sk->sk_err || (sk->sk_shutdown & RCV_SHUTDOWN))
283 if (signal_pending(current) || !timeo)
286 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
288 timeo = schedule_timeout(timeo);
290 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
293 __set_current_state(TASK_RUNNING);
294 remove_wait_queue(sk_sleep(sk), &wait);
298 int bt_sock_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
299 struct msghdr *msg, size_t size, int flags)
301 struct sock *sk = sock->sk;
303 size_t target, copied = 0;
309 msg->msg_namelen = 0;
311 BT_DBG("sk %p size %zu", sk, size);
315 target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
316 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
322 skb = skb_dequeue(&sk->sk_receive_queue);
324 if (copied >= target)
327 err = sock_error(sk);
330 if (sk->sk_shutdown & RCV_SHUTDOWN)
337 timeo = bt_sock_data_wait(sk, timeo);
339 if (signal_pending(current)) {
340 err = sock_intr_errno(timeo);
346 chunk = min_t(unsigned int, skb->len, size);
347 if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, chunk)) {
348 skb_queue_head(&sk->sk_receive_queue, skb);
356 sock_recv_ts_and_drops(msg, sk, skb);
358 if (!(flags & MSG_PEEK)) {
359 int skb_len = skb_headlen(skb);
361 if (chunk <= skb_len) {
362 __skb_pull(skb, chunk);
364 struct sk_buff *frag;
366 __skb_pull(skb, skb_len);
369 skb_walk_frags(skb, frag) {
370 if (chunk <= frag->len) {
371 /* Pulling partial data */
373 skb->data_len -= chunk;
374 __skb_pull(frag, chunk);
376 } else if (frag->len) {
377 /* Pulling all frag data */
379 skb->len -= frag->len;
380 skb->data_len -= frag->len;
381 __skb_pull(frag, frag->len);
387 skb_queue_head(&sk->sk_receive_queue, skb);
393 /* put message back and return */
394 skb_queue_head(&sk->sk_receive_queue, skb);
401 return copied ? : err;
403 EXPORT_SYMBOL(bt_sock_stream_recvmsg);
405 static inline unsigned int bt_accept_poll(struct sock *parent)
407 struct list_head *p, *n;
410 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
411 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
412 if (sk->sk_state == BT_CONNECTED ||
413 (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags) &&
414 sk->sk_state == BT_CONNECT2))
415 return POLLIN | POLLRDNORM;
421 unsigned int bt_sock_poll(struct file *file, struct socket *sock,
424 struct sock *sk = sock->sk;
425 unsigned int mask = 0;
427 BT_DBG("sock %p, sk %p", sock, sk);
429 poll_wait(file, sk_sleep(sk), wait);
431 if (sk->sk_state == BT_LISTEN)
432 return bt_accept_poll(sk);
434 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
437 if (sk->sk_shutdown & RCV_SHUTDOWN)
438 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
440 if (sk->sk_shutdown == SHUTDOWN_MASK)
443 if (!skb_queue_empty(&sk->sk_receive_queue))
444 mask |= POLLIN | POLLRDNORM;
446 if (sk->sk_state == BT_CLOSED)
449 if (sk->sk_state == BT_CONNECT ||
450 sk->sk_state == BT_CONNECT2 ||
451 sk->sk_state == BT_CONFIG)
454 if (!test_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags) && sock_writeable(sk))
455 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
457 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
461 EXPORT_SYMBOL(bt_sock_poll);
463 int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
465 struct sock *sk = sock->sk;
470 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
474 if (sk->sk_state == BT_LISTEN)
477 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
480 err = put_user(amount, (int __user *) arg);
484 if (sk->sk_state == BT_LISTEN)
488 skb = skb_peek(&sk->sk_receive_queue);
489 amount = skb ? skb->len : 0;
491 err = put_user(amount, (int __user *) arg);
495 err = sock_get_timestamp(sk, (struct timeval __user *) arg);
499 err = sock_get_timestampns(sk, (struct timespec __user *) arg);
509 EXPORT_SYMBOL(bt_sock_ioctl);
511 int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
513 DECLARE_WAITQUEUE(wait, current);
518 add_wait_queue(sk_sleep(sk), &wait);
519 set_current_state(TASK_INTERRUPTIBLE);
520 while (sk->sk_state != state) {
526 if (signal_pending(current)) {
527 err = sock_intr_errno(timeo);
532 timeo = schedule_timeout(timeo);
534 set_current_state(TASK_INTERRUPTIBLE);
536 err = sock_error(sk);
540 __set_current_state(TASK_RUNNING);
541 remove_wait_queue(sk_sleep(sk), &wait);
544 EXPORT_SYMBOL(bt_sock_wait_state);
546 static struct net_proto_family bt_sock_family_ops = {
547 .owner = THIS_MODULE,
548 .family = PF_BLUETOOTH,
549 .create = bt_sock_create,
552 static int __init bt_init(void)
556 BT_INFO("Core ver %s", VERSION);
558 err = bt_sysfs_init();
562 err = sock_register(&bt_sock_family_ops);
568 BT_INFO("HCI device and connection manager initialized");
570 err = hci_sock_init();
590 sock_unregister(PF_BLUETOOTH);
596 static void __exit bt_exit(void)
605 sock_unregister(PF_BLUETOOTH);
610 subsys_initcall(bt_init);
611 module_exit(bt_exit);
613 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
614 MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
615 MODULE_VERSION(VERSION);
616 MODULE_LICENSE("GPL");
617 MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);