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 LT |
38 | #include <net/sock.h> |
39 | ||
40 | #if defined(CONFIG_KMOD) | |
41 | #include <linux/kmod.h> | |
42 | #endif | |
43 | ||
44 | #include <net/bluetooth/bluetooth.h> | |
45 | ||
46 | #ifndef CONFIG_BT_SOCK_DEBUG | |
47 | #undef BT_DBG | |
48 | #define BT_DBG(D...) | |
49 | #endif | |
50 | ||
4c67bc74 | 51 | #define VERSION "2.11" |
1da177e4 LT |
52 | |
53 | /* Bluetooth sockets */ | |
54 | #define BT_MAX_PROTO 8 | |
55 | static struct net_proto_family *bt_proto[BT_MAX_PROTO]; | |
68845cb2 DY |
56 | |
57 | static struct lock_class_key bt_slock_key[BT_MAX_PROTO]; | |
58 | static struct lock_class_key bt_lock_key[BT_MAX_PROTO]; | |
59 | static const char *bt_key_strings[BT_MAX_PROTO] = { | |
60 | "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP", | |
61 | "sk_lock-AF_BLUETOOTH-BTPROTO_HCI", | |
62 | "sk_lock-AF_BLUETOOTH-BTPROTO_SCO", | |
63 | "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM", | |
64 | "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP", | |
65 | "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP", | |
66 | "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP", | |
67 | "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP", | |
68 | }; | |
69 | ||
70 | static const char *bt_slock_key_strings[BT_MAX_PROTO] = { | |
71 | "slock-AF_BLUETOOTH-BTPROTO_L2CAP", | |
72 | "slock-AF_BLUETOOTH-BTPROTO_HCI", | |
73 | "slock-AF_BLUETOOTH-BTPROTO_SCO", | |
74 | "slock-AF_BLUETOOTH-BTPROTO_RFCOMM", | |
75 | "slock-AF_BLUETOOTH-BTPROTO_BNEP", | |
76 | "slock-AF_BLUETOOTH-BTPROTO_CMTP", | |
77 | "slock-AF_BLUETOOTH-BTPROTO_HIDP", | |
78 | "slock-AF_BLUETOOTH-BTPROTO_AVDTP", | |
79 | }; | |
74da626a | 80 | static DEFINE_RWLOCK(bt_proto_lock); |
1da177e4 LT |
81 | |
82 | int bt_sock_register(int proto, struct net_proto_family *ops) | |
83 | { | |
74da626a MH |
84 | int err = 0; |
85 | ||
1da177e4 LT |
86 | if (proto < 0 || proto >= BT_MAX_PROTO) |
87 | return -EINVAL; | |
88 | ||
74da626a MH |
89 | write_lock(&bt_proto_lock); |
90 | ||
1da177e4 | 91 | if (bt_proto[proto]) |
74da626a MH |
92 | err = -EEXIST; |
93 | else | |
94 | bt_proto[proto] = ops; | |
95 | ||
96 | write_unlock(&bt_proto_lock); | |
1da177e4 | 97 | |
74da626a | 98 | return err; |
1da177e4 LT |
99 | } |
100 | EXPORT_SYMBOL(bt_sock_register); | |
101 | ||
102 | int bt_sock_unregister(int proto) | |
103 | { | |
74da626a MH |
104 | int err = 0; |
105 | ||
1da177e4 LT |
106 | if (proto < 0 || proto >= BT_MAX_PROTO) |
107 | return -EINVAL; | |
108 | ||
74da626a MH |
109 | write_lock(&bt_proto_lock); |
110 | ||
1da177e4 | 111 | if (!bt_proto[proto]) |
74da626a MH |
112 | err = -ENOENT; |
113 | else | |
114 | bt_proto[proto] = NULL; | |
1da177e4 | 115 | |
74da626a MH |
116 | write_unlock(&bt_proto_lock); |
117 | ||
118 | return err; | |
1da177e4 LT |
119 | } |
120 | EXPORT_SYMBOL(bt_sock_unregister); | |
121 | ||
68845cb2 DY |
122 | static void bt_reclassify_sock_lock(struct socket *sock, int proto) |
123 | { | |
124 | struct sock *sk = sock->sk; | |
125 | ||
126 | if (!sk) | |
127 | return; | |
128 | BUG_ON(sock_owned_by_user(sk)); | |
129 | ||
130 | sock_lock_init_class_and_name(sk, | |
131 | bt_slock_key_strings[proto], | |
132 | &bt_slock_key[proto], | |
133 | bt_key_strings[proto], | |
134 | &bt_lock_key[proto]); | |
135 | } | |
136 | ||
1b8d7ae4 | 137 | static int bt_sock_create(struct net *net, struct socket *sock, int proto) |
1da177e4 | 138 | { |
74da626a | 139 | int err; |
1da177e4 | 140 | |
1b8d7ae4 EB |
141 | if (net != &init_net) |
142 | return -EAFNOSUPPORT; | |
143 | ||
1da177e4 LT |
144 | if (proto < 0 || proto >= BT_MAX_PROTO) |
145 | return -EINVAL; | |
146 | ||
147 | #if defined(CONFIG_KMOD) | |
148 | if (!bt_proto[proto]) { | |
149 | request_module("bt-proto-%d", proto); | |
150 | } | |
151 | #endif | |
74da626a | 152 | |
1da177e4 | 153 | err = -EPROTONOSUPPORT; |
74da626a MH |
154 | |
155 | read_lock(&bt_proto_lock); | |
156 | ||
1da177e4 | 157 | if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) { |
1b8d7ae4 | 158 | err = bt_proto[proto]->create(net, sock, proto); |
68845cb2 | 159 | bt_reclassify_sock_lock(sock, proto); |
1da177e4 LT |
160 | module_put(bt_proto[proto]->owner); |
161 | } | |
74da626a MH |
162 | |
163 | read_unlock(&bt_proto_lock); | |
164 | ||
8e87d142 | 165 | return err; |
1da177e4 LT |
166 | } |
167 | ||
168 | void bt_sock_link(struct bt_sock_list *l, struct sock *sk) | |
169 | { | |
170 | write_lock_bh(&l->lock); | |
171 | sk_add_node(sk, &l->head); | |
172 | write_unlock_bh(&l->lock); | |
173 | } | |
174 | EXPORT_SYMBOL(bt_sock_link); | |
175 | ||
176 | void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk) | |
177 | { | |
178 | write_lock_bh(&l->lock); | |
179 | sk_del_node_init(sk); | |
180 | write_unlock_bh(&l->lock); | |
181 | } | |
182 | EXPORT_SYMBOL(bt_sock_unlink); | |
183 | ||
184 | void bt_accept_enqueue(struct sock *parent, struct sock *sk) | |
185 | { | |
186 | BT_DBG("parent %p, sk %p", parent, sk); | |
187 | ||
188 | sock_hold(sk); | |
189 | list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q); | |
190 | bt_sk(sk)->parent = parent; | |
191 | parent->sk_ack_backlog++; | |
192 | } | |
193 | EXPORT_SYMBOL(bt_accept_enqueue); | |
194 | ||
195 | void bt_accept_unlink(struct sock *sk) | |
196 | { | |
197 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
198 | ||
199 | list_del_init(&bt_sk(sk)->accept_q); | |
200 | bt_sk(sk)->parent->sk_ack_backlog--; | |
201 | bt_sk(sk)->parent = NULL; | |
202 | sock_put(sk); | |
203 | } | |
204 | EXPORT_SYMBOL(bt_accept_unlink); | |
205 | ||
206 | struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock) | |
207 | { | |
208 | struct list_head *p, *n; | |
209 | struct sock *sk; | |
210 | ||
211 | BT_DBG("parent %p", parent); | |
212 | ||
213 | list_for_each_safe(p, n, &bt_sk(parent)->accept_q) { | |
214 | sk = (struct sock *) list_entry(p, struct bt_sock, accept_q); | |
215 | ||
216 | lock_sock(sk); | |
217 | ||
218 | /* FIXME: Is this check still needed */ | |
219 | if (sk->sk_state == BT_CLOSED) { | |
220 | release_sock(sk); | |
221 | bt_accept_unlink(sk); | |
222 | continue; | |
223 | } | |
224 | ||
225 | if (sk->sk_state == BT_CONNECTED || !newsock) { | |
226 | bt_accept_unlink(sk); | |
227 | if (newsock) | |
228 | sock_graft(sk, newsock); | |
229 | release_sock(sk); | |
230 | return sk; | |
231 | } | |
232 | ||
233 | release_sock(sk); | |
234 | } | |
235 | return NULL; | |
236 | } | |
237 | EXPORT_SYMBOL(bt_accept_dequeue); | |
238 | ||
239 | int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
240 | struct msghdr *msg, size_t len, int flags) | |
241 | { | |
242 | int noblock = flags & MSG_DONTWAIT; | |
243 | struct sock *sk = sock->sk; | |
244 | struct sk_buff *skb; | |
245 | size_t copied; | |
246 | int err; | |
247 | ||
248 | BT_DBG("sock %p sk %p len %d", sock, sk, len); | |
249 | ||
250 | if (flags & (MSG_OOB)) | |
251 | return -EOPNOTSUPP; | |
252 | ||
253 | if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) { | |
254 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
255 | return 0; | |
256 | return err; | |
257 | } | |
258 | ||
259 | msg->msg_namelen = 0; | |
260 | ||
261 | copied = skb->len; | |
262 | if (len < copied) { | |
263 | msg->msg_flags |= MSG_TRUNC; | |
264 | copied = len; | |
265 | } | |
266 | ||
badff6d0 | 267 | skb_reset_transport_header(skb); |
1da177e4 LT |
268 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
269 | ||
270 | skb_free_datagram(sk, skb); | |
271 | ||
272 | return err ? : copied; | |
273 | } | |
274 | EXPORT_SYMBOL(bt_sock_recvmsg); | |
275 | ||
276 | static inline unsigned int bt_accept_poll(struct sock *parent) | |
277 | { | |
278 | struct list_head *p, *n; | |
279 | struct sock *sk; | |
280 | ||
281 | list_for_each_safe(p, n, &bt_sk(parent)->accept_q) { | |
282 | sk = (struct sock *) list_entry(p, struct bt_sock, accept_q); | |
283 | if (sk->sk_state == BT_CONNECTED) | |
284 | return POLLIN | POLLRDNORM; | |
285 | } | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait) | |
291 | { | |
292 | struct sock *sk = sock->sk; | |
293 | unsigned int mask = 0; | |
294 | ||
295 | BT_DBG("sock %p, sk %p", sock, sk); | |
296 | ||
297 | poll_wait(file, sk->sk_sleep, wait); | |
298 | ||
299 | if (sk->sk_state == BT_LISTEN) | |
300 | return bt_accept_poll(sk); | |
301 | ||
302 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
303 | mask |= POLLERR; | |
304 | ||
f348d70a DL |
305 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
306 | mask |= POLLRDHUP; | |
307 | ||
1da177e4 LT |
308 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
309 | mask |= POLLHUP; | |
310 | ||
8e87d142 | 311 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
1da177e4 LT |
312 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
313 | mask |= POLLIN | POLLRDNORM; | |
314 | ||
315 | if (sk->sk_state == BT_CLOSED) | |
316 | mask |= POLLHUP; | |
317 | ||
318 | if (sk->sk_state == BT_CONNECT || | |
319 | sk->sk_state == BT_CONNECT2 || | |
320 | sk->sk_state == BT_CONFIG) | |
321 | return mask; | |
322 | ||
323 | if (sock_writeable(sk)) | |
324 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
325 | else | |
326 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
327 | ||
328 | return mask; | |
329 | } | |
330 | EXPORT_SYMBOL(bt_sock_poll); | |
331 | ||
332 | int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo) | |
333 | { | |
334 | DECLARE_WAITQUEUE(wait, current); | |
335 | int err = 0; | |
336 | ||
337 | BT_DBG("sk %p", sk); | |
338 | ||
339 | add_wait_queue(sk->sk_sleep, &wait); | |
340 | while (sk->sk_state != state) { | |
341 | set_current_state(TASK_INTERRUPTIBLE); | |
342 | ||
343 | if (!timeo) { | |
b4c612a4 | 344 | err = -EINPROGRESS; |
1da177e4 LT |
345 | break; |
346 | } | |
347 | ||
348 | if (signal_pending(current)) { | |
349 | err = sock_intr_errno(timeo); | |
350 | break; | |
351 | } | |
352 | ||
353 | release_sock(sk); | |
354 | timeo = schedule_timeout(timeo); | |
355 | lock_sock(sk); | |
356 | ||
c1cbe4b7 BL |
357 | err = sock_error(sk); |
358 | if (err) | |
1da177e4 | 359 | break; |
1da177e4 LT |
360 | } |
361 | set_current_state(TASK_RUNNING); | |
362 | remove_wait_queue(sk->sk_sleep, &wait); | |
363 | return err; | |
364 | } | |
365 | EXPORT_SYMBOL(bt_sock_wait_state); | |
366 | ||
367 | static struct net_proto_family bt_sock_family_ops = { | |
368 | .owner = THIS_MODULE, | |
369 | .family = PF_BLUETOOTH, | |
370 | .create = bt_sock_create, | |
371 | }; | |
372 | ||
1da177e4 LT |
373 | static int __init bt_init(void) |
374 | { | |
27d35284 MH |
375 | int err; |
376 | ||
1da177e4 LT |
377 | BT_INFO("Core ver %s", VERSION); |
378 | ||
27d35284 MH |
379 | err = bt_sysfs_init(); |
380 | if (err < 0) | |
381 | return err; | |
1da177e4 | 382 | |
27d35284 MH |
383 | err = sock_register(&bt_sock_family_ops); |
384 | if (err < 0) { | |
385 | bt_sysfs_cleanup(); | |
386 | return err; | |
387 | } | |
1da177e4 | 388 | |
27d35284 | 389 | BT_INFO("HCI device and connection manager initialized"); |
1da177e4 LT |
390 | |
391 | hci_sock_init(); | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | static void __exit bt_exit(void) | |
397 | { | |
398 | hci_sock_cleanup(); | |
399 | ||
1da177e4 | 400 | sock_unregister(PF_BLUETOOTH); |
27d35284 MH |
401 | |
402 | bt_sysfs_cleanup(); | |
1da177e4 LT |
403 | } |
404 | ||
405 | subsys_initcall(bt_init); | |
406 | module_exit(bt_exit); | |
407 | ||
408 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); | |
409 | MODULE_DESCRIPTION("Bluetooth Core ver " VERSION); | |
410 | MODULE_VERSION(VERSION); | |
411 | MODULE_LICENSE("GPL"); | |
412 | MODULE_ALIAS_NETPROTO(PF_BLUETOOTH); |