1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
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;
10
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.
19
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.
23 */
24
25 /* Bluetooth address family and sockets. */
26
27 #include <linux/module.h>
28
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>
38 #include <net/sock.h>
39 #include <asm/ioctls.h>
40 #include <linux/kmod.h>
41
42 #include <net/bluetooth/bluetooth.h>
43
44 #define VERSION "2.15"
45
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);
50
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",
61 };
62
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",
73 };
74
75 static inline void bt_sock_reclassify_lock(struct socket *sock, int proto)
76 {
77 struct sock *sk = sock->sk;
78
79 if (!sk)
80 return;
81
82 BUG_ON(sock_owned_by_user(sk));
83
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]);
87 }
88
89 int bt_sock_register(int proto, struct net_proto_family *ops)
90 {
91 int err = 0;
92
93 if (proto < 0 || proto >= BT_MAX_PROTO)
94 return -EINVAL;
95
96 write_lock(&bt_proto_lock);
97
98 if (bt_proto[proto])
99 err = -EEXIST;
100 else
101 bt_proto[proto] = ops;
102
103 write_unlock(&bt_proto_lock);
104
105 return err;
106 }
107 EXPORT_SYMBOL(bt_sock_register);
108
109 int bt_sock_unregister(int proto)
110 {
111 int err = 0;
112
113 if (proto < 0 || proto >= BT_MAX_PROTO)
114 return -EINVAL;
115
116 write_lock(&bt_proto_lock);
117
118 if (!bt_proto[proto])
119 err = -ENOENT;
120 else
121 bt_proto[proto] = NULL;
122
123 write_unlock(&bt_proto_lock);
124
125 return err;
126 }
127 EXPORT_SYMBOL(bt_sock_unregister);
128
129 static int bt_sock_create(struct net *net, struct socket *sock, int proto)
130 {
131 int err;
132
133 if (net != &init_net)
134 return -EAFNOSUPPORT;
135
136 if (proto < 0 || proto >= BT_MAX_PROTO)
137 return -EINVAL;
138
139 if (!bt_proto[proto])
140 request_module("bt-proto-%d", proto);
141
142 err = -EPROTONOSUPPORT;
143
144 read_lock(&bt_proto_lock);
145
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);
150 }
151
152 read_unlock(&bt_proto_lock);
153
154 return err;
155 }
156
157 void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
158 {
159 write_lock_bh(&l->lock);
160 sk_add_node(sk, &l->head);
161 write_unlock_bh(&l->lock);
162 }
163 EXPORT_SYMBOL(bt_sock_link);
164
165 void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
166 {
167 write_lock_bh(&l->lock);
168 sk_del_node_init(sk);
169 write_unlock_bh(&l->lock);
170 }
171 EXPORT_SYMBOL(bt_sock_unlink);
172
173 void bt_accept_enqueue(struct sock *parent, struct sock *sk)
174 {
175 BT_DBG("parent %p, sk %p", parent, sk);
176
177 sock_hold(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++;
181 }
182 EXPORT_SYMBOL(bt_accept_enqueue);
183
184 void bt_accept_unlink(struct sock *sk)
185 {
186 BT_DBG("sk %p state %d", sk, sk->sk_state);
187
188 list_del_init(&bt_sk(sk)->accept_q);
189 bt_sk(sk)->parent->sk_ack_backlog--;
190 bt_sk(sk)->parent = NULL;
191 sock_put(sk);
192 }
193 EXPORT_SYMBOL(bt_accept_unlink);
194
195 struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
196 {
197 struct list_head *p, *n;
198 struct sock *sk;
199
200 BT_DBG("parent %p", parent);
201
202 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
203 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
204
205 lock_sock(sk);
206
207 /* FIXME: Is this check still needed */
208 if (sk->sk_state == BT_CLOSED) {
209 release_sock(sk);
210 bt_accept_unlink(sk);
211 continue;
212 }
213
214 if (sk->sk_state == BT_CONNECTED || !newsock ||
215 bt_sk(parent)->defer_setup) {
216 bt_accept_unlink(sk);
217 if (newsock)
218 sock_graft(sk, newsock);
219 release_sock(sk);
220 return sk;
221 }
222
223 release_sock(sk);
224 }
225 return NULL;
226 }
227 EXPORT_SYMBOL(bt_accept_dequeue);
228
229 int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
230 struct msghdr *msg, size_t len, int flags)
231 {
232 int noblock = flags & MSG_DONTWAIT;
233 struct sock *sk = sock->sk;
234 struct sk_buff *skb;
235 size_t copied;
236 int err;
237
238 BT_DBG("sock %p sk %p len %zu", sock, sk, len);
239
240 if (flags & (MSG_OOB))
241 return -EOPNOTSUPP;
242
243 if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) {
244 if (sk->sk_shutdown & RCV_SHUTDOWN)
245 return 0;
246 return err;
247 }
248
249 msg->msg_namelen = 0;
250
251 copied = skb->len;
252 if (len < copied) {
253 msg->msg_flags |= MSG_TRUNC;
254 copied = len;
255 }
256
257 skb_reset_transport_header(skb);
258 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
259 if (err == 0)
260 sock_recv_timestamp(msg, sk, skb);
261
262 skb_free_datagram(sk, skb);
263
264 return err ? : copied;
265 }
266 EXPORT_SYMBOL(bt_sock_recvmsg);
267
268 static inline unsigned int bt_accept_poll(struct sock *parent)
269 {
270 struct list_head *p, *n;
271 struct sock *sk;
272
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;
279 }
280
281 return 0;
282 }
283
284 unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait)
285 {
286 struct sock *sk = sock->sk;
287 unsigned int mask = 0;
288
289 BT_DBG("sock %p, sk %p", sock, sk);
290
291 poll_wait(file, sk->sk_sleep, wait);
292
293 if (sk->sk_state == BT_LISTEN)
294 return bt_accept_poll(sk);
295
296 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
297 mask |= POLLERR;
298
299 if (sk->sk_shutdown & RCV_SHUTDOWN)
300 mask |= POLLRDHUP;
301
302 if (sk->sk_shutdown == SHUTDOWN_MASK)
303 mask |= POLLHUP;
304
305 if (!skb_queue_empty(&sk->sk_receive_queue) ||
306 (sk->sk_shutdown & RCV_SHUTDOWN))
307 mask |= POLLIN | POLLRDNORM;
308
309 if (sk->sk_state == BT_CLOSED)
310 mask |= POLLHUP;
311
312 if (sk->sk_state == BT_CONNECT ||
313 sk->sk_state == BT_CONNECT2 ||
314 sk->sk_state == BT_CONFIG)
315 return mask;
316
317 if (sock_writeable(sk))
318 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
319 else
320 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
321
322 return mask;
323 }
324 EXPORT_SYMBOL(bt_sock_poll);
325
326 int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
327 {
328 struct sock *sk = sock->sk;
329 struct sk_buff *skb;
330 long amount;
331 int err;
332
333 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
334
335 switch (cmd) {
336 case TIOCOUTQ:
337 if (sk->sk_state == BT_LISTEN)
338 return -EINVAL;
339
340 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
341 if (amount < 0)
342 amount = 0;
343 err = put_user(amount, (int __user *) arg);
344 break;
345
346 case TIOCINQ:
347 if (sk->sk_state == BT_LISTEN)
348 return -EINVAL;
349
350 lock_sock(sk);
351 skb = skb_peek(&sk->sk_receive_queue);
352 amount = skb ? skb->len : 0;
353 release_sock(sk);
354 err = put_user(amount, (int __user *) arg);
355 break;
356
357 case SIOCGSTAMP:
358 err = sock_get_timestamp(sk, (struct timeval __user *) arg);
359 break;
360
361 case SIOCGSTAMPNS:
362 err = sock_get_timestampns(sk, (struct timespec __user *) arg);
363 break;
364
365 default:
366 err = -ENOIOCTLCMD;
367 break;
368 }
369
370 return err;
371 }
372 EXPORT_SYMBOL(bt_sock_ioctl);
373
374 int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
375 {
376 DECLARE_WAITQUEUE(wait, current);
377 int err = 0;
378
379 BT_DBG("sk %p", sk);
380
381 add_wait_queue(sk->sk_sleep, &wait);
382 while (sk->sk_state != state) {
383 set_current_state(TASK_INTERRUPTIBLE);
384
385 if (!timeo) {
386 err = -EINPROGRESS;
387 break;
388 }
389
390 if (signal_pending(current)) {
391 err = sock_intr_errno(timeo);
392 break;
393 }
394
395 release_sock(sk);
396 timeo = schedule_timeout(timeo);
397 lock_sock(sk);
398
399 err = sock_error(sk);
400 if (err)
401 break;
402 }
403 set_current_state(TASK_RUNNING);
404 remove_wait_queue(sk->sk_sleep, &wait);
405 return err;
406 }
407 EXPORT_SYMBOL(bt_sock_wait_state);
408
409 static struct net_proto_family bt_sock_family_ops = {
410 .owner = THIS_MODULE,
411 .family = PF_BLUETOOTH,
412 .create = bt_sock_create,
413 };
414
415 static int __init bt_init(void)
416 {
417 int err;
418
419 BT_INFO("Core ver %s", VERSION);
420
421 err = bt_sysfs_init();
422 if (err < 0)
423 return err;
424
425 err = sock_register(&bt_sock_family_ops);
426 if (err < 0) {
427 bt_sysfs_cleanup();
428 return err;
429 }
430
431 BT_INFO("HCI device and connection manager initialized");
432
433 hci_sock_init();
434
435 return 0;
436 }
437
438 static void __exit bt_exit(void)
439 {
440 hci_sock_cleanup();
441
442 sock_unregister(PF_BLUETOOTH);
443
444 bt_sysfs_cleanup();
445 }
446
447 subsys_initcall(bt_init);
448 module_exit(bt_exit);
449
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);
455
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