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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 *const 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 *const 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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