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>
41 #if defined(CONFIG_KMOD)
42 #include <linux/kmod.h>
45 #include <net/bluetooth/bluetooth.h>
47 #ifndef CONFIG_BT_SOCK_DEBUG
52 #define VERSION "2.12"
54 /* Bluetooth sockets */
55 #define BT_MAX_PROTO 8
56 static struct net_proto_family *bt_proto[BT_MAX_PROTO];
58 static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
59 static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
60 static const char *bt_key_strings[BT_MAX_PROTO] = {
61 "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
62 "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
63 "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
64 "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
65 "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
66 "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
67 "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
68 "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
71 static const char *bt_slock_key_strings[BT_MAX_PROTO] = {
72 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
73 "slock-AF_BLUETOOTH-BTPROTO_HCI",
74 "slock-AF_BLUETOOTH-BTPROTO_SCO",
75 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
76 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
77 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
78 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
79 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
81 static DEFINE_RWLOCK(bt_proto_lock);
83 int bt_sock_register(int proto, struct net_proto_family *ops)
87 if (proto < 0 || proto >= BT_MAX_PROTO)
90 write_lock(&bt_proto_lock);
95 bt_proto[proto] = ops;
97 write_unlock(&bt_proto_lock);
101 EXPORT_SYMBOL(bt_sock_register);
103 int bt_sock_unregister(int proto)
107 if (proto < 0 || proto >= BT_MAX_PROTO)
110 write_lock(&bt_proto_lock);
112 if (!bt_proto[proto])
115 bt_proto[proto] = NULL;
117 write_unlock(&bt_proto_lock);
121 EXPORT_SYMBOL(bt_sock_unregister);
123 static void bt_reclassify_sock_lock(struct socket *sock, int proto)
125 struct sock *sk = sock->sk;
129 BUG_ON(sock_owned_by_user(sk));
131 sock_lock_init_class_and_name(sk,
132 bt_slock_key_strings[proto],
133 &bt_slock_key[proto],
134 bt_key_strings[proto],
135 &bt_lock_key[proto]);
138 static int bt_sock_create(struct net *net, struct socket *sock, int proto)
142 if (net != &init_net)
143 return -EAFNOSUPPORT;
145 if (proto < 0 || proto >= BT_MAX_PROTO)
148 #if defined(CONFIG_KMOD)
149 if (!bt_proto[proto]) {
150 request_module("bt-proto-%d", proto);
154 err = -EPROTONOSUPPORT;
156 read_lock(&bt_proto_lock);
158 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
159 err = bt_proto[proto]->create(net, sock, proto);
160 bt_reclassify_sock_lock(sock, proto);
161 module_put(bt_proto[proto]->owner);
164 read_unlock(&bt_proto_lock);
169 void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
171 write_lock_bh(&l->lock);
172 sk_add_node(sk, &l->head);
173 write_unlock_bh(&l->lock);
175 EXPORT_SYMBOL(bt_sock_link);
177 void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
179 write_lock_bh(&l->lock);
180 sk_del_node_init(sk);
181 write_unlock_bh(&l->lock);
183 EXPORT_SYMBOL(bt_sock_unlink);
185 void bt_accept_enqueue(struct sock *parent, struct sock *sk)
187 BT_DBG("parent %p, sk %p", parent, sk);
190 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
191 bt_sk(sk)->parent = parent;
192 parent->sk_ack_backlog++;
194 EXPORT_SYMBOL(bt_accept_enqueue);
196 void bt_accept_unlink(struct sock *sk)
198 BT_DBG("sk %p state %d", sk, sk->sk_state);
200 list_del_init(&bt_sk(sk)->accept_q);
201 bt_sk(sk)->parent->sk_ack_backlog--;
202 bt_sk(sk)->parent = NULL;
205 EXPORT_SYMBOL(bt_accept_unlink);
207 struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
209 struct list_head *p, *n;
212 BT_DBG("parent %p", parent);
214 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
215 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
219 /* FIXME: Is this check still needed */
220 if (sk->sk_state == BT_CLOSED) {
222 bt_accept_unlink(sk);
226 if (sk->sk_state == BT_CONNECTED || !newsock) {
227 bt_accept_unlink(sk);
229 sock_graft(sk, newsock);
238 EXPORT_SYMBOL(bt_accept_dequeue);
240 int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
241 struct msghdr *msg, size_t len, int flags)
243 int noblock = flags & MSG_DONTWAIT;
244 struct sock *sk = sock->sk;
249 BT_DBG("sock %p sk %p len %d", sock, sk, len);
251 if (flags & (MSG_OOB))
254 if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) {
255 if (sk->sk_shutdown & RCV_SHUTDOWN)
260 msg->msg_namelen = 0;
264 msg->msg_flags |= MSG_TRUNC;
268 skb_reset_transport_header(skb);
269 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
271 sock_recv_timestamp(msg, sk, skb);
273 skb_free_datagram(sk, skb);
275 return err ? : copied;
277 EXPORT_SYMBOL(bt_sock_recvmsg);
279 static inline unsigned int bt_accept_poll(struct sock *parent)
281 struct list_head *p, *n;
284 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
285 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
286 if (sk->sk_state == BT_CONNECTED)
287 return POLLIN | POLLRDNORM;
293 unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait)
295 struct sock *sk = sock->sk;
296 unsigned int mask = 0;
298 BT_DBG("sock %p, sk %p", sock, sk);
300 poll_wait(file, sk->sk_sleep, wait);
302 if (sk->sk_state == BT_LISTEN)
303 return bt_accept_poll(sk);
305 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
308 if (sk->sk_shutdown & RCV_SHUTDOWN)
311 if (sk->sk_shutdown == SHUTDOWN_MASK)
314 if (!skb_queue_empty(&sk->sk_receive_queue) ||
315 (sk->sk_shutdown & RCV_SHUTDOWN))
316 mask |= POLLIN | POLLRDNORM;
318 if (sk->sk_state == BT_CLOSED)
321 if (sk->sk_state == BT_CONNECT ||
322 sk->sk_state == BT_CONNECT2 ||
323 sk->sk_state == BT_CONFIG)
326 if (sock_writeable(sk))
327 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
329 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
333 EXPORT_SYMBOL(bt_sock_poll);
335 int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
337 struct sock *sk = sock->sk;
342 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
346 if (sk->sk_state == BT_LISTEN)
349 amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
352 err = put_user(amount, (int __user *) arg);
356 if (sk->sk_state == BT_LISTEN)
360 skb = skb_peek(&sk->sk_receive_queue);
361 amount = skb ? skb->len : 0;
363 err = put_user(amount, (int __user *) arg);
367 err = sock_get_timestamp(sk, (struct timeval __user *) arg);
371 err = sock_get_timestampns(sk, (struct timespec __user *) arg);
381 EXPORT_SYMBOL(bt_sock_ioctl);
383 int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
385 DECLARE_WAITQUEUE(wait, current);
390 add_wait_queue(sk->sk_sleep, &wait);
391 while (sk->sk_state != state) {
392 set_current_state(TASK_INTERRUPTIBLE);
399 if (signal_pending(current)) {
400 err = sock_intr_errno(timeo);
405 timeo = schedule_timeout(timeo);
408 err = sock_error(sk);
412 set_current_state(TASK_RUNNING);
413 remove_wait_queue(sk->sk_sleep, &wait);
416 EXPORT_SYMBOL(bt_sock_wait_state);
418 static struct net_proto_family bt_sock_family_ops = {
419 .owner = THIS_MODULE,
420 .family = PF_BLUETOOTH,
421 .create = bt_sock_create,
424 static int __init bt_init(void)
428 BT_INFO("Core ver %s", VERSION);
430 err = bt_sysfs_init();
434 err = sock_register(&bt_sock_family_ops);
440 BT_INFO("HCI device and connection manager initialized");
447 static void __exit bt_exit(void)
451 sock_unregister(PF_BLUETOOTH);
456 subsys_initcall(bt_init);
457 module_exit(bt_exit);
459 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
460 MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
461 MODULE_VERSION(VERSION);
462 MODULE_LICENSE("GPL");
463 MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);