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Commit | Line | Data |
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8e87d142 | 1 | /* |
1da177e4 LT |
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 | |
8e87d142 YH |
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 | |
1da177e4 LT |
18 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
19 | ||
8e87d142 YH |
20 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, |
21 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
1da177e4 LT |
22 | SOFTWARE IS DISCLAIMED. |
23 | */ | |
24 | ||
25 | /* Bluetooth address family and sockets. */ | |
26 | ||
1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
1da177e4 | 38 | #include <net/sock.h> |
3241ad82 | 39 | #include <asm/ioctls.h> |
1da177e4 LT |
40 | |
41 | #if defined(CONFIG_KMOD) | |
42 | #include <linux/kmod.h> | |
43 | #endif | |
44 | ||
45 | #include <net/bluetooth/bluetooth.h> | |
46 | ||
47 | #ifndef CONFIG_BT_SOCK_DEBUG | |
48 | #undef BT_DBG | |
49 | #define BT_DBG(D...) | |
50 | #endif | |
51 | ||
e7c29cb1 | 52 | #define VERSION "2.13" |
1da177e4 LT |
53 | |
54 | /* Bluetooth sockets */ | |
55 | #define BT_MAX_PROTO 8 | |
56 | static struct net_proto_family *bt_proto[BT_MAX_PROTO]; | |
68845cb2 DY |
57 | |
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", | |
69 | }; | |
70 | ||
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", | |
80 | }; | |
74da626a | 81 | static DEFINE_RWLOCK(bt_proto_lock); |
1da177e4 LT |
82 | |
83 | int bt_sock_register(int proto, struct net_proto_family *ops) | |
84 | { | |
74da626a MH |
85 | int err = 0; |
86 | ||
1da177e4 LT |
87 | if (proto < 0 || proto >= BT_MAX_PROTO) |
88 | return -EINVAL; | |
89 | ||
74da626a MH |
90 | write_lock(&bt_proto_lock); |
91 | ||
1da177e4 | 92 | if (bt_proto[proto]) |
74da626a MH |
93 | err = -EEXIST; |
94 | else | |
95 | bt_proto[proto] = ops; | |
96 | ||
97 | write_unlock(&bt_proto_lock); | |
1da177e4 | 98 | |
74da626a | 99 | return err; |
1da177e4 LT |
100 | } |
101 | EXPORT_SYMBOL(bt_sock_register); | |
102 | ||
103 | int bt_sock_unregister(int proto) | |
104 | { | |
74da626a MH |
105 | int err = 0; |
106 | ||
1da177e4 LT |
107 | if (proto < 0 || proto >= BT_MAX_PROTO) |
108 | return -EINVAL; | |
109 | ||
74da626a MH |
110 | write_lock(&bt_proto_lock); |
111 | ||
1da177e4 | 112 | if (!bt_proto[proto]) |
74da626a MH |
113 | err = -ENOENT; |
114 | else | |
115 | bt_proto[proto] = NULL; | |
1da177e4 | 116 | |
74da626a MH |
117 | write_unlock(&bt_proto_lock); |
118 | ||
119 | return err; | |
1da177e4 LT |
120 | } |
121 | EXPORT_SYMBOL(bt_sock_unregister); | |
122 | ||
68845cb2 DY |
123 | static void bt_reclassify_sock_lock(struct socket *sock, int proto) |
124 | { | |
125 | struct sock *sk = sock->sk; | |
126 | ||
127 | if (!sk) | |
128 | return; | |
129 | BUG_ON(sock_owned_by_user(sk)); | |
130 | ||
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]); | |
136 | } | |
137 | ||
1b8d7ae4 | 138 | static int bt_sock_create(struct net *net, struct socket *sock, int proto) |
1da177e4 | 139 | { |
74da626a | 140 | int err; |
1da177e4 | 141 | |
1b8d7ae4 EB |
142 | if (net != &init_net) |
143 | return -EAFNOSUPPORT; | |
144 | ||
1da177e4 LT |
145 | if (proto < 0 || proto >= BT_MAX_PROTO) |
146 | return -EINVAL; | |
147 | ||
148 | #if defined(CONFIG_KMOD) | |
149 | if (!bt_proto[proto]) { | |
150 | request_module("bt-proto-%d", proto); | |
151 | } | |
152 | #endif | |
74da626a | 153 | |
1da177e4 | 154 | err = -EPROTONOSUPPORT; |
74da626a MH |
155 | |
156 | read_lock(&bt_proto_lock); | |
157 | ||
1da177e4 | 158 | if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) { |
1b8d7ae4 | 159 | err = bt_proto[proto]->create(net, sock, proto); |
68845cb2 | 160 | bt_reclassify_sock_lock(sock, proto); |
1da177e4 LT |
161 | module_put(bt_proto[proto]->owner); |
162 | } | |
74da626a MH |
163 | |
164 | read_unlock(&bt_proto_lock); | |
165 | ||
8e87d142 | 166 | return err; |
1da177e4 LT |
167 | } |
168 | ||
169 | void bt_sock_link(struct bt_sock_list *l, struct sock *sk) | |
170 | { | |
171 | write_lock_bh(&l->lock); | |
172 | sk_add_node(sk, &l->head); | |
173 | write_unlock_bh(&l->lock); | |
174 | } | |
175 | EXPORT_SYMBOL(bt_sock_link); | |
176 | ||
177 | void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk) | |
178 | { | |
179 | write_lock_bh(&l->lock); | |
180 | sk_del_node_init(sk); | |
181 | write_unlock_bh(&l->lock); | |
182 | } | |
183 | EXPORT_SYMBOL(bt_sock_unlink); | |
184 | ||
185 | void bt_accept_enqueue(struct sock *parent, struct sock *sk) | |
186 | { | |
187 | BT_DBG("parent %p, sk %p", parent, sk); | |
188 | ||
189 | sock_hold(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++; | |
193 | } | |
194 | EXPORT_SYMBOL(bt_accept_enqueue); | |
195 | ||
196 | void bt_accept_unlink(struct sock *sk) | |
197 | { | |
198 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
199 | ||
200 | list_del_init(&bt_sk(sk)->accept_q); | |
201 | bt_sk(sk)->parent->sk_ack_backlog--; | |
202 | bt_sk(sk)->parent = NULL; | |
203 | sock_put(sk); | |
204 | } | |
205 | EXPORT_SYMBOL(bt_accept_unlink); | |
206 | ||
207 | struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock) | |
208 | { | |
209 | struct list_head *p, *n; | |
210 | struct sock *sk; | |
211 | ||
212 | BT_DBG("parent %p", parent); | |
213 | ||
214 | list_for_each_safe(p, n, &bt_sk(parent)->accept_q) { | |
215 | sk = (struct sock *) list_entry(p, struct bt_sock, accept_q); | |
216 | ||
217 | lock_sock(sk); | |
218 | ||
219 | /* FIXME: Is this check still needed */ | |
220 | if (sk->sk_state == BT_CLOSED) { | |
221 | release_sock(sk); | |
222 | bt_accept_unlink(sk); | |
223 | continue; | |
224 | } | |
225 | ||
226 | if (sk->sk_state == BT_CONNECTED || !newsock) { | |
227 | bt_accept_unlink(sk); | |
228 | if (newsock) | |
229 | sock_graft(sk, newsock); | |
230 | release_sock(sk); | |
231 | return sk; | |
232 | } | |
233 | ||
234 | release_sock(sk); | |
235 | } | |
236 | return NULL; | |
237 | } | |
238 | EXPORT_SYMBOL(bt_accept_dequeue); | |
239 | ||
240 | int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
241 | struct msghdr *msg, size_t len, int flags) | |
242 | { | |
243 | int noblock = flags & MSG_DONTWAIT; | |
244 | struct sock *sk = sock->sk; | |
245 | struct sk_buff *skb; | |
246 | size_t copied; | |
247 | int err; | |
248 | ||
249 | BT_DBG("sock %p sk %p len %d", sock, sk, len); | |
250 | ||
251 | if (flags & (MSG_OOB)) | |
252 | return -EOPNOTSUPP; | |
253 | ||
254 | if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) { | |
255 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
256 | return 0; | |
257 | return err; | |
258 | } | |
259 | ||
260 | msg->msg_namelen = 0; | |
261 | ||
262 | copied = skb->len; | |
263 | if (len < copied) { | |
264 | msg->msg_flags |= MSG_TRUNC; | |
265 | copied = len; | |
266 | } | |
267 | ||
badff6d0 | 268 | skb_reset_transport_header(skb); |
1da177e4 | 269 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
3241ad82 MH |
270 | if (err == 0) |
271 | sock_recv_timestamp(msg, sk, skb); | |
1da177e4 LT |
272 | |
273 | skb_free_datagram(sk, skb); | |
274 | ||
275 | return err ? : copied; | |
276 | } | |
277 | EXPORT_SYMBOL(bt_sock_recvmsg); | |
278 | ||
279 | static inline unsigned int bt_accept_poll(struct sock *parent) | |
280 | { | |
281 | struct list_head *p, *n; | |
282 | struct sock *sk; | |
283 | ||
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; | |
288 | } | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait) | |
294 | { | |
295 | struct sock *sk = sock->sk; | |
296 | unsigned int mask = 0; | |
297 | ||
298 | BT_DBG("sock %p, sk %p", sock, sk); | |
299 | ||
300 | poll_wait(file, sk->sk_sleep, wait); | |
301 | ||
302 | if (sk->sk_state == BT_LISTEN) | |
303 | return bt_accept_poll(sk); | |
304 | ||
305 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
306 | mask |= POLLERR; | |
307 | ||
f348d70a DL |
308 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
309 | mask |= POLLRDHUP; | |
310 | ||
1da177e4 LT |
311 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
312 | mask |= POLLHUP; | |
313 | ||
8e87d142 | 314 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
1da177e4 LT |
315 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
316 | mask |= POLLIN | POLLRDNORM; | |
317 | ||
318 | if (sk->sk_state == BT_CLOSED) | |
319 | mask |= POLLHUP; | |
320 | ||
321 | if (sk->sk_state == BT_CONNECT || | |
322 | sk->sk_state == BT_CONNECT2 || | |
323 | sk->sk_state == BT_CONFIG) | |
324 | return mask; | |
325 | ||
326 | if (sock_writeable(sk)) | |
327 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
328 | else | |
329 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
330 | ||
331 | return mask; | |
332 | } | |
333 | EXPORT_SYMBOL(bt_sock_poll); | |
334 | ||
3241ad82 MH |
335 | int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
336 | { | |
337 | struct sock *sk = sock->sk; | |
43cbeee9 MH |
338 | struct sk_buff *skb; |
339 | long amount; | |
3241ad82 MH |
340 | int err; |
341 | ||
342 | BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg); | |
343 | ||
344 | switch (cmd) { | |
43cbeee9 MH |
345 | case TIOCOUTQ: |
346 | if (sk->sk_state == BT_LISTEN) | |
347 | return -EINVAL; | |
348 | ||
349 | amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); | |
350 | if (amount < 0) | |
351 | amount = 0; | |
352 | err = put_user(amount, (int __user *) arg); | |
353 | break; | |
354 | ||
355 | case TIOCINQ: | |
356 | if (sk->sk_state == BT_LISTEN) | |
357 | return -EINVAL; | |
358 | ||
359 | lock_sock(sk); | |
360 | skb = skb_peek(&sk->sk_receive_queue); | |
361 | amount = skb ? skb->len : 0; | |
362 | release_sock(sk); | |
363 | err = put_user(amount, (int __user *) arg); | |
364 | break; | |
365 | ||
3241ad82 MH |
366 | case SIOCGSTAMP: |
367 | err = sock_get_timestamp(sk, (struct timeval __user *) arg); | |
368 | break; | |
369 | ||
370 | case SIOCGSTAMPNS: | |
371 | err = sock_get_timestampns(sk, (struct timespec __user *) arg); | |
372 | break; | |
373 | ||
374 | default: | |
375 | err = -ENOIOCTLCMD; | |
376 | break; | |
377 | } | |
378 | ||
379 | return err; | |
380 | } | |
381 | EXPORT_SYMBOL(bt_sock_ioctl); | |
382 | ||
1da177e4 LT |
383 | int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo) |
384 | { | |
385 | DECLARE_WAITQUEUE(wait, current); | |
386 | int err = 0; | |
387 | ||
388 | BT_DBG("sk %p", sk); | |
389 | ||
390 | add_wait_queue(sk->sk_sleep, &wait); | |
391 | while (sk->sk_state != state) { | |
392 | set_current_state(TASK_INTERRUPTIBLE); | |
393 | ||
394 | if (!timeo) { | |
b4c612a4 | 395 | err = -EINPROGRESS; |
1da177e4 LT |
396 | break; |
397 | } | |
398 | ||
399 | if (signal_pending(current)) { | |
400 | err = sock_intr_errno(timeo); | |
401 | break; | |
402 | } | |
403 | ||
404 | release_sock(sk); | |
405 | timeo = schedule_timeout(timeo); | |
406 | lock_sock(sk); | |
407 | ||
c1cbe4b7 BL |
408 | err = sock_error(sk); |
409 | if (err) | |
1da177e4 | 410 | break; |
1da177e4 LT |
411 | } |
412 | set_current_state(TASK_RUNNING); | |
413 | remove_wait_queue(sk->sk_sleep, &wait); | |
414 | return err; | |
415 | } | |
416 | EXPORT_SYMBOL(bt_sock_wait_state); | |
417 | ||
418 | static struct net_proto_family bt_sock_family_ops = { | |
419 | .owner = THIS_MODULE, | |
420 | .family = PF_BLUETOOTH, | |
421 | .create = bt_sock_create, | |
422 | }; | |
423 | ||
1da177e4 LT |
424 | static int __init bt_init(void) |
425 | { | |
27d35284 MH |
426 | int err; |
427 | ||
1da177e4 LT |
428 | BT_INFO("Core ver %s", VERSION); |
429 | ||
27d35284 MH |
430 | err = bt_sysfs_init(); |
431 | if (err < 0) | |
432 | return err; | |
1da177e4 | 433 | |
27d35284 MH |
434 | err = sock_register(&bt_sock_family_ops); |
435 | if (err < 0) { | |
436 | bt_sysfs_cleanup(); | |
437 | return err; | |
438 | } | |
1da177e4 | 439 | |
27d35284 | 440 | BT_INFO("HCI device and connection manager initialized"); |
1da177e4 LT |
441 | |
442 | hci_sock_init(); | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static void __exit bt_exit(void) | |
448 | { | |
449 | hci_sock_cleanup(); | |
450 | ||
1da177e4 | 451 | sock_unregister(PF_BLUETOOTH); |
27d35284 MH |
452 | |
453 | bt_sysfs_cleanup(); | |
1da177e4 LT |
454 | } |
455 | ||
456 | subsys_initcall(bt_init); | |
457 | module_exit(bt_exit); | |
458 | ||
63fbd24e | 459 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
1da177e4 LT |
460 | MODULE_DESCRIPTION("Bluetooth Core ver " VERSION); |
461 | MODULE_VERSION(VERSION); | |
462 | MODULE_LICENSE("GPL"); | |
463 | MODULE_ALIAS_NETPROTO(PF_BLUETOOTH); |