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/slab.h>
35 #include <linux/skbuff.h>
36 #include <linux/init.h>
37 #include <linux/poll.h>
39 #include <asm/ioctls.h>
40 #include <linux/kmod.h>
42 #include <net/bluetooth/bluetooth.h>
44 #define VERSION "2.15"
46 /* Bluetooth sockets */
47 #define BT_MAX_PROTO 8
48 static struct net_proto_family *bt_proto[BT_MAX_PROTO];
49 static DEFINE_RWLOCK(bt_proto_lock);
51 static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
52 static const char *bt_key_strings[BT_MAX_PROTO] = {
53 "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
54 "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
55 "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
56 "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
57 "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
58 "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
59 "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
60 "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
63 static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
64 static const char *bt_slock_key_strings[BT_MAX_PROTO] = {
65 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
66 "slock-AF_BLUETOOTH-BTPROTO_HCI",
67 "slock-AF_BLUETOOTH-BTPROTO_SCO",
68 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
69 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
70 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
71 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
72 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
75 static inline void bt_sock_reclassify_lock(struct socket *sock, int proto)
77 struct sock *sk = sock->sk;
82 BUG_ON(sock_owned_by_user(sk));
84 sock_lock_init_class_and_name(sk,
85 bt_slock_key_strings[proto], &bt_slock_key[proto],
86 bt_key_strings[proto], &bt_lock_key[proto]);
89 int bt_sock_register(int proto, struct net_proto_family *ops)
93 if (proto < 0 || proto >= BT_MAX_PROTO)
96 write_lock(&bt_proto_lock);
101 bt_proto[proto] = ops;
103 write_unlock(&bt_proto_lock);
107 EXPORT_SYMBOL(bt_sock_register);
109 int bt_sock_unregister(int proto)
113 if (proto < 0 || proto >= BT_MAX_PROTO)
116 write_lock(&bt_proto_lock);
118 if (!bt_proto[proto])
121 bt_proto[proto] = NULL;
123 write_unlock(&bt_proto_lock);
127 EXPORT_SYMBOL(bt_sock_unregister);
129 static int bt_sock_create(struct net *net, struct socket *sock, int proto)
133 if (net != &init_net)
134 return -EAFNOSUPPORT;
136 if (proto < 0 || proto >= BT_MAX_PROTO)
139 if (!bt_proto[proto])
140 request_module("bt-proto-%d", proto);
142 err = -EPROTONOSUPPORT;
144 read_lock(&bt_proto_lock);
146 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
147 err = bt_proto[proto]->create(net, sock, proto);
148 bt_sock_reclassify_lock(sock, proto);
149 module_put(bt_proto[proto]->owner);
152 read_unlock(&bt_proto_lock);
157 void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
159 write_lock_bh(&l->lock);
160 sk_add_node(sk, &l->head);
161 write_unlock_bh(&l->lock);
163 EXPORT_SYMBOL(bt_sock_link);
165 void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
167 write_lock_bh(&l->lock);
168 sk_del_node_init(sk);
169 write_unlock_bh(&l->lock);
171 EXPORT_SYMBOL(bt_sock_unlink);
173 void bt_accept_enqueue(struct sock *parent, struct sock *sk)
175 BT_DBG("parent %p, sk %p", parent, sk);
178 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
179 bt_sk(sk)->parent = parent;
180 parent->sk_ack_backlog++;
182 EXPORT_SYMBOL(bt_accept_enqueue);
184 void bt_accept_unlink(struct sock *sk)
186 BT_DBG("sk %p state %d", sk, sk->sk_state);
188 list_del_init(&bt_sk(sk)->accept_q);
189 bt_sk(sk)->parent->sk_ack_backlog--;
190 bt_sk(sk)->parent = NULL;
193 EXPORT_SYMBOL(bt_accept_unlink);
195 struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
197 struct list_head *p, *n;
200 BT_DBG("parent %p", parent);
202 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
203 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
207 /* FIXME: Is this check still needed */
208 if (sk->sk_state == BT_CLOSED) {
210 bt_accept_unlink(sk);
214 if (sk->sk_state == BT_CONNECTED || !newsock ||
215 bt_sk(parent)->defer_setup) {
216 bt_accept_unlink(sk);
218 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 if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) {
244 if (sk->sk_shutdown & RCV_SHUTDOWN)
249 msg->msg_namelen = 0;
253 msg->msg_flags |= MSG_TRUNC;
257 skb_reset_transport_header(skb);
258 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
260 sock_recv_timestamp(msg, sk, skb);
262 skb_free_datagram(sk, skb);
264 return err ? : copied;
266 EXPORT_SYMBOL(bt_sock_recvmsg);
268 static inline unsigned int bt_accept_poll(struct sock *parent)
270 struct list_head *p, *n;
273 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
274 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
275 if (sk->sk_state == BT_CONNECTED ||
276 (bt_sk(parent)->defer_setup &&
277 sk->sk_state == BT_CONNECT2))
278 return POLLIN | POLLRDNORM;
284 unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait)
286 struct sock *sk = sock->sk;
287 unsigned int mask = 0;
289 BT_DBG("sock %p, sk %p", sock, sk);
291 poll_wait(file, sk->sk_sleep, wait);
293 if (sk->sk_state == BT_LISTEN)
294 return bt_accept_poll(sk);
296 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
299 if (sk->sk_shutdown & RCV_SHUTDOWN)
302 if (sk->sk_shutdown == SHUTDOWN_MASK)
305 if (!skb_queue_empty(&sk->sk_receive_queue) ||
306 (sk->sk_shutdown & RCV_SHUTDOWN))
307 mask |= POLLIN | POLLRDNORM;
309 if (sk->sk_state == BT_CLOSED)
312 if (sk->sk_state == BT_CONNECT ||
313 sk->sk_state == BT_CONNECT2 ||
314 sk->sk_state == BT_CONFIG)
317 if (sock_writeable(sk))
318 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
320 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
324 EXPORT_SYMBOL(bt_sock_poll);
326 int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
328 struct sock *sk = sock->sk;
333 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
337 if (sk->sk_state == BT_LISTEN)
340 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
343 err = put_user(amount, (int __user *) arg);
347 if (sk->sk_state == BT_LISTEN)
351 skb = skb_peek(&sk->sk_receive_queue);
352 amount = skb ? skb->len : 0;
354 err = put_user(amount, (int __user *) arg);
358 err = sock_get_timestamp(sk, (struct timeval __user *) arg);
362 err = sock_get_timestampns(sk, (struct timespec __user *) arg);
372 EXPORT_SYMBOL(bt_sock_ioctl);
374 int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
376 DECLARE_WAITQUEUE(wait, current);
381 add_wait_queue(sk->sk_sleep, &wait);
382 while (sk->sk_state != state) {
383 set_current_state(TASK_INTERRUPTIBLE);
390 if (signal_pending(current)) {
391 err = sock_intr_errno(timeo);
396 timeo = schedule_timeout(timeo);
399 err = sock_error(sk);
403 set_current_state(TASK_RUNNING);
404 remove_wait_queue(sk->sk_sleep, &wait);
407 EXPORT_SYMBOL(bt_sock_wait_state);
409 static struct net_proto_family bt_sock_family_ops = {
410 .owner = THIS_MODULE,
411 .family = PF_BLUETOOTH,
412 .create = bt_sock_create,
415 static int __init bt_init(void)
419 BT_INFO("Core ver %s", VERSION);
421 err = bt_sysfs_init();
425 err = sock_register(&bt_sock_family_ops);
431 BT_INFO("HCI device and connection manager initialized");
438 static void __exit bt_exit(void)
442 sock_unregister(PF_BLUETOOTH);
447 subsys_initcall(bt_init);
448 module_exit(bt_exit);
450 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
451 MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
452 MODULE_VERSION(VERSION);
453 MODULE_LICENSE("GPL");
454 MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);