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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/config.h> | |
28 | #include <linux/module.h> | |
29 | ||
30 | #include <linux/types.h> | |
31 | #include <linux/list.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/major.h> | |
35 | #include <linux/sched.h> | |
36 | #include <linux/slab.h> | |
37 | #include <linux/skbuff.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/poll.h> | |
40 | #include <linux/proc_fs.h> | |
41 | #include <net/sock.h> | |
42 | ||
43 | #if defined(CONFIG_KMOD) | |
44 | #include <linux/kmod.h> | |
45 | #endif | |
46 | ||
47 | #include <net/bluetooth/bluetooth.h> | |
48 | ||
49 | #ifndef CONFIG_BT_SOCK_DEBUG | |
50 | #undef BT_DBG | |
51 | #define BT_DBG(D...) | |
52 | #endif | |
53 | ||
54 | #define VERSION "2.7" | |
55 | ||
56 | struct proc_dir_entry *proc_bt; | |
57 | EXPORT_SYMBOL(proc_bt); | |
58 | ||
59 | /* Bluetooth sockets */ | |
60 | #define BT_MAX_PROTO 8 | |
61 | static struct net_proto_family *bt_proto[BT_MAX_PROTO]; | |
62 | ||
63 | int bt_sock_register(int proto, struct net_proto_family *ops) | |
64 | { | |
65 | if (proto < 0 || proto >= BT_MAX_PROTO) | |
66 | return -EINVAL; | |
67 | ||
68 | if (bt_proto[proto]) | |
69 | return -EEXIST; | |
70 | ||
71 | bt_proto[proto] = ops; | |
72 | return 0; | |
73 | } | |
74 | EXPORT_SYMBOL(bt_sock_register); | |
75 | ||
76 | int bt_sock_unregister(int proto) | |
77 | { | |
78 | if (proto < 0 || proto >= BT_MAX_PROTO) | |
79 | return -EINVAL; | |
80 | ||
81 | if (!bt_proto[proto]) | |
82 | return -ENOENT; | |
83 | ||
84 | bt_proto[proto] = NULL; | |
85 | return 0; | |
86 | } | |
87 | EXPORT_SYMBOL(bt_sock_unregister); | |
88 | ||
89 | static int bt_sock_create(struct socket *sock, int proto) | |
90 | { | |
91 | int err = 0; | |
92 | ||
93 | if (proto < 0 || proto >= BT_MAX_PROTO) | |
94 | return -EINVAL; | |
95 | ||
96 | #if defined(CONFIG_KMOD) | |
97 | if (!bt_proto[proto]) { | |
98 | request_module("bt-proto-%d", proto); | |
99 | } | |
100 | #endif | |
101 | err = -EPROTONOSUPPORT; | |
102 | if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) { | |
103 | err = bt_proto[proto]->create(sock, proto); | |
104 | module_put(bt_proto[proto]->owner); | |
105 | } | |
106 | return err; | |
107 | } | |
108 | ||
109 | void bt_sock_link(struct bt_sock_list *l, struct sock *sk) | |
110 | { | |
111 | write_lock_bh(&l->lock); | |
112 | sk_add_node(sk, &l->head); | |
113 | write_unlock_bh(&l->lock); | |
114 | } | |
115 | EXPORT_SYMBOL(bt_sock_link); | |
116 | ||
117 | void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk) | |
118 | { | |
119 | write_lock_bh(&l->lock); | |
120 | sk_del_node_init(sk); | |
121 | write_unlock_bh(&l->lock); | |
122 | } | |
123 | EXPORT_SYMBOL(bt_sock_unlink); | |
124 | ||
125 | void bt_accept_enqueue(struct sock *parent, struct sock *sk) | |
126 | { | |
127 | BT_DBG("parent %p, sk %p", parent, sk); | |
128 | ||
129 | sock_hold(sk); | |
130 | list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q); | |
131 | bt_sk(sk)->parent = parent; | |
132 | parent->sk_ack_backlog++; | |
133 | } | |
134 | EXPORT_SYMBOL(bt_accept_enqueue); | |
135 | ||
136 | void bt_accept_unlink(struct sock *sk) | |
137 | { | |
138 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
139 | ||
140 | list_del_init(&bt_sk(sk)->accept_q); | |
141 | bt_sk(sk)->parent->sk_ack_backlog--; | |
142 | bt_sk(sk)->parent = NULL; | |
143 | sock_put(sk); | |
144 | } | |
145 | EXPORT_SYMBOL(bt_accept_unlink); | |
146 | ||
147 | struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock) | |
148 | { | |
149 | struct list_head *p, *n; | |
150 | struct sock *sk; | |
151 | ||
152 | BT_DBG("parent %p", parent); | |
153 | ||
154 | list_for_each_safe(p, n, &bt_sk(parent)->accept_q) { | |
155 | sk = (struct sock *) list_entry(p, struct bt_sock, accept_q); | |
156 | ||
157 | lock_sock(sk); | |
158 | ||
159 | /* FIXME: Is this check still needed */ | |
160 | if (sk->sk_state == BT_CLOSED) { | |
161 | release_sock(sk); | |
162 | bt_accept_unlink(sk); | |
163 | continue; | |
164 | } | |
165 | ||
166 | if (sk->sk_state == BT_CONNECTED || !newsock) { | |
167 | bt_accept_unlink(sk); | |
168 | if (newsock) | |
169 | sock_graft(sk, newsock); | |
170 | release_sock(sk); | |
171 | return sk; | |
172 | } | |
173 | ||
174 | release_sock(sk); | |
175 | } | |
176 | return NULL; | |
177 | } | |
178 | EXPORT_SYMBOL(bt_accept_dequeue); | |
179 | ||
180 | int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
181 | struct msghdr *msg, size_t len, int flags) | |
182 | { | |
183 | int noblock = flags & MSG_DONTWAIT; | |
184 | struct sock *sk = sock->sk; | |
185 | struct sk_buff *skb; | |
186 | size_t copied; | |
187 | int err; | |
188 | ||
189 | BT_DBG("sock %p sk %p len %d", sock, sk, len); | |
190 | ||
191 | if (flags & (MSG_OOB)) | |
192 | return -EOPNOTSUPP; | |
193 | ||
194 | if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) { | |
195 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
196 | return 0; | |
197 | return err; | |
198 | } | |
199 | ||
200 | msg->msg_namelen = 0; | |
201 | ||
202 | copied = skb->len; | |
203 | if (len < copied) { | |
204 | msg->msg_flags |= MSG_TRUNC; | |
205 | copied = len; | |
206 | } | |
207 | ||
208 | skb->h.raw = skb->data; | |
209 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
210 | ||
211 | skb_free_datagram(sk, skb); | |
212 | ||
213 | return err ? : copied; | |
214 | } | |
215 | EXPORT_SYMBOL(bt_sock_recvmsg); | |
216 | ||
217 | static inline unsigned int bt_accept_poll(struct sock *parent) | |
218 | { | |
219 | struct list_head *p, *n; | |
220 | struct sock *sk; | |
221 | ||
222 | list_for_each_safe(p, n, &bt_sk(parent)->accept_q) { | |
223 | sk = (struct sock *) list_entry(p, struct bt_sock, accept_q); | |
224 | if (sk->sk_state == BT_CONNECTED) | |
225 | return POLLIN | POLLRDNORM; | |
226 | } | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait) | |
232 | { | |
233 | struct sock *sk = sock->sk; | |
234 | unsigned int mask = 0; | |
235 | ||
236 | BT_DBG("sock %p, sk %p", sock, sk); | |
237 | ||
238 | poll_wait(file, sk->sk_sleep, wait); | |
239 | ||
240 | if (sk->sk_state == BT_LISTEN) | |
241 | return bt_accept_poll(sk); | |
242 | ||
243 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
244 | mask |= POLLERR; | |
245 | ||
246 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
247 | mask |= POLLHUP; | |
248 | ||
249 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
250 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
251 | mask |= POLLIN | POLLRDNORM; | |
252 | ||
253 | if (sk->sk_state == BT_CLOSED) | |
254 | mask |= POLLHUP; | |
255 | ||
256 | if (sk->sk_state == BT_CONNECT || | |
257 | sk->sk_state == BT_CONNECT2 || | |
258 | sk->sk_state == BT_CONFIG) | |
259 | return mask; | |
260 | ||
261 | if (sock_writeable(sk)) | |
262 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
263 | else | |
264 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
265 | ||
266 | return mask; | |
267 | } | |
268 | EXPORT_SYMBOL(bt_sock_poll); | |
269 | ||
270 | int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo) | |
271 | { | |
272 | DECLARE_WAITQUEUE(wait, current); | |
273 | int err = 0; | |
274 | ||
275 | BT_DBG("sk %p", sk); | |
276 | ||
277 | add_wait_queue(sk->sk_sleep, &wait); | |
278 | while (sk->sk_state != state) { | |
279 | set_current_state(TASK_INTERRUPTIBLE); | |
280 | ||
281 | if (!timeo) { | |
282 | err = -EAGAIN; | |
283 | break; | |
284 | } | |
285 | ||
286 | if (signal_pending(current)) { | |
287 | err = sock_intr_errno(timeo); | |
288 | break; | |
289 | } | |
290 | ||
291 | release_sock(sk); | |
292 | timeo = schedule_timeout(timeo); | |
293 | lock_sock(sk); | |
294 | ||
295 | if (sk->sk_err) { | |
296 | err = sock_error(sk); | |
297 | break; | |
298 | } | |
299 | } | |
300 | set_current_state(TASK_RUNNING); | |
301 | remove_wait_queue(sk->sk_sleep, &wait); | |
302 | return err; | |
303 | } | |
304 | EXPORT_SYMBOL(bt_sock_wait_state); | |
305 | ||
306 | static struct net_proto_family bt_sock_family_ops = { | |
307 | .owner = THIS_MODULE, | |
308 | .family = PF_BLUETOOTH, | |
309 | .create = bt_sock_create, | |
310 | }; | |
311 | ||
312 | extern int hci_sock_init(void); | |
313 | extern int hci_sock_cleanup(void); | |
314 | ||
315 | extern int bt_sysfs_init(void); | |
316 | extern int bt_sysfs_cleanup(void); | |
317 | ||
318 | static int __init bt_init(void) | |
319 | { | |
320 | BT_INFO("Core ver %s", VERSION); | |
321 | ||
322 | proc_bt = proc_mkdir("bluetooth", NULL); | |
323 | if (proc_bt) | |
324 | proc_bt->owner = THIS_MODULE; | |
325 | ||
326 | sock_register(&bt_sock_family_ops); | |
327 | ||
328 | BT_INFO("HCI device and connection manager initialized"); | |
329 | ||
330 | bt_sysfs_init(); | |
331 | ||
332 | hci_sock_init(); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static void __exit bt_exit(void) | |
338 | { | |
339 | hci_sock_cleanup(); | |
340 | ||
341 | bt_sysfs_cleanup(); | |
342 | ||
343 | sock_unregister(PF_BLUETOOTH); | |
344 | ||
345 | remove_proc_entry("bluetooth", NULL); | |
346 | } | |
347 | ||
348 | subsys_initcall(bt_init); | |
349 | module_exit(bt_exit); | |
350 | ||
351 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); | |
352 | MODULE_DESCRIPTION("Bluetooth Core ver " VERSION); | |
353 | MODULE_VERSION(VERSION); | |
354 | MODULE_LICENSE("GPL"); | |
355 | MODULE_ALIAS_NETPROTO(PF_BLUETOOTH); |