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1da177e4 LT |
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 | ||
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 | ||
04837f64 | 51 | #define VERSION "2.9" |
1da177e4 LT |
52 | |
53 | /* Bluetooth sockets */ | |
54 | #define BT_MAX_PROTO 8 | |
55 | static struct net_proto_family *bt_proto[BT_MAX_PROTO]; | |
56 | ||
57 | int bt_sock_register(int proto, struct net_proto_family *ops) | |
58 | { | |
59 | if (proto < 0 || proto >= BT_MAX_PROTO) | |
60 | return -EINVAL; | |
61 | ||
62 | if (bt_proto[proto]) | |
63 | return -EEXIST; | |
64 | ||
65 | bt_proto[proto] = ops; | |
66 | return 0; | |
67 | } | |
68 | EXPORT_SYMBOL(bt_sock_register); | |
69 | ||
70 | int bt_sock_unregister(int proto) | |
71 | { | |
72 | if (proto < 0 || proto >= BT_MAX_PROTO) | |
73 | return -EINVAL; | |
74 | ||
75 | if (!bt_proto[proto]) | |
76 | return -ENOENT; | |
77 | ||
78 | bt_proto[proto] = NULL; | |
79 | return 0; | |
80 | } | |
81 | EXPORT_SYMBOL(bt_sock_unregister); | |
82 | ||
83 | static int bt_sock_create(struct socket *sock, int proto) | |
84 | { | |
85 | int err = 0; | |
86 | ||
87 | if (proto < 0 || proto >= BT_MAX_PROTO) | |
88 | return -EINVAL; | |
89 | ||
90 | #if defined(CONFIG_KMOD) | |
91 | if (!bt_proto[proto]) { | |
92 | request_module("bt-proto-%d", proto); | |
93 | } | |
94 | #endif | |
95 | err = -EPROTONOSUPPORT; | |
96 | if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) { | |
97 | err = bt_proto[proto]->create(sock, proto); | |
98 | module_put(bt_proto[proto]->owner); | |
99 | } | |
100 | return err; | |
101 | } | |
102 | ||
103 | void bt_sock_link(struct bt_sock_list *l, struct sock *sk) | |
104 | { | |
105 | write_lock_bh(&l->lock); | |
106 | sk_add_node(sk, &l->head); | |
107 | write_unlock_bh(&l->lock); | |
108 | } | |
109 | EXPORT_SYMBOL(bt_sock_link); | |
110 | ||
111 | void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk) | |
112 | { | |
113 | write_lock_bh(&l->lock); | |
114 | sk_del_node_init(sk); | |
115 | write_unlock_bh(&l->lock); | |
116 | } | |
117 | EXPORT_SYMBOL(bt_sock_unlink); | |
118 | ||
119 | void bt_accept_enqueue(struct sock *parent, struct sock *sk) | |
120 | { | |
121 | BT_DBG("parent %p, sk %p", parent, sk); | |
122 | ||
123 | sock_hold(sk); | |
124 | list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q); | |
125 | bt_sk(sk)->parent = parent; | |
126 | parent->sk_ack_backlog++; | |
127 | } | |
128 | EXPORT_SYMBOL(bt_accept_enqueue); | |
129 | ||
130 | void bt_accept_unlink(struct sock *sk) | |
131 | { | |
132 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
133 | ||
134 | list_del_init(&bt_sk(sk)->accept_q); | |
135 | bt_sk(sk)->parent->sk_ack_backlog--; | |
136 | bt_sk(sk)->parent = NULL; | |
137 | sock_put(sk); | |
138 | } | |
139 | EXPORT_SYMBOL(bt_accept_unlink); | |
140 | ||
141 | struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock) | |
142 | { | |
143 | struct list_head *p, *n; | |
144 | struct sock *sk; | |
145 | ||
146 | BT_DBG("parent %p", parent); | |
147 | ||
148 | list_for_each_safe(p, n, &bt_sk(parent)->accept_q) { | |
149 | sk = (struct sock *) list_entry(p, struct bt_sock, accept_q); | |
150 | ||
151 | lock_sock(sk); | |
152 | ||
153 | /* FIXME: Is this check still needed */ | |
154 | if (sk->sk_state == BT_CLOSED) { | |
155 | release_sock(sk); | |
156 | bt_accept_unlink(sk); | |
157 | continue; | |
158 | } | |
159 | ||
160 | if (sk->sk_state == BT_CONNECTED || !newsock) { | |
161 | bt_accept_unlink(sk); | |
162 | if (newsock) | |
163 | sock_graft(sk, newsock); | |
164 | release_sock(sk); | |
165 | return sk; | |
166 | } | |
167 | ||
168 | release_sock(sk); | |
169 | } | |
170 | return NULL; | |
171 | } | |
172 | EXPORT_SYMBOL(bt_accept_dequeue); | |
173 | ||
174 | int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
175 | struct msghdr *msg, size_t len, int flags) | |
176 | { | |
177 | int noblock = flags & MSG_DONTWAIT; | |
178 | struct sock *sk = sock->sk; | |
179 | struct sk_buff *skb; | |
180 | size_t copied; | |
181 | int err; | |
182 | ||
183 | BT_DBG("sock %p sk %p len %d", sock, sk, len); | |
184 | ||
185 | if (flags & (MSG_OOB)) | |
186 | return -EOPNOTSUPP; | |
187 | ||
188 | if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) { | |
189 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
190 | return 0; | |
191 | return err; | |
192 | } | |
193 | ||
194 | msg->msg_namelen = 0; | |
195 | ||
196 | copied = skb->len; | |
197 | if (len < copied) { | |
198 | msg->msg_flags |= MSG_TRUNC; | |
199 | copied = len; | |
200 | } | |
201 | ||
202 | skb->h.raw = skb->data; | |
203 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
204 | ||
205 | skb_free_datagram(sk, skb); | |
206 | ||
207 | return err ? : copied; | |
208 | } | |
209 | EXPORT_SYMBOL(bt_sock_recvmsg); | |
210 | ||
211 | static inline unsigned int bt_accept_poll(struct sock *parent) | |
212 | { | |
213 | struct list_head *p, *n; | |
214 | struct sock *sk; | |
215 | ||
216 | list_for_each_safe(p, n, &bt_sk(parent)->accept_q) { | |
217 | sk = (struct sock *) list_entry(p, struct bt_sock, accept_q); | |
218 | if (sk->sk_state == BT_CONNECTED) | |
219 | return POLLIN | POLLRDNORM; | |
220 | } | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait) | |
226 | { | |
227 | struct sock *sk = sock->sk; | |
228 | unsigned int mask = 0; | |
229 | ||
230 | BT_DBG("sock %p, sk %p", sock, sk); | |
231 | ||
232 | poll_wait(file, sk->sk_sleep, wait); | |
233 | ||
234 | if (sk->sk_state == BT_LISTEN) | |
235 | return bt_accept_poll(sk); | |
236 | ||
237 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
238 | mask |= POLLERR; | |
239 | ||
f348d70a DL |
240 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
241 | mask |= POLLRDHUP; | |
242 | ||
1da177e4 LT |
243 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
244 | mask |= POLLHUP; | |
245 | ||
246 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
247 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
248 | mask |= POLLIN | POLLRDNORM; | |
249 | ||
250 | if (sk->sk_state == BT_CLOSED) | |
251 | mask |= POLLHUP; | |
252 | ||
253 | if (sk->sk_state == BT_CONNECT || | |
254 | sk->sk_state == BT_CONNECT2 || | |
255 | sk->sk_state == BT_CONFIG) | |
256 | return mask; | |
257 | ||
258 | if (sock_writeable(sk)) | |
259 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
260 | else | |
261 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
262 | ||
263 | return mask; | |
264 | } | |
265 | EXPORT_SYMBOL(bt_sock_poll); | |
266 | ||
267 | int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo) | |
268 | { | |
269 | DECLARE_WAITQUEUE(wait, current); | |
270 | int err = 0; | |
271 | ||
272 | BT_DBG("sk %p", sk); | |
273 | ||
274 | add_wait_queue(sk->sk_sleep, &wait); | |
275 | while (sk->sk_state != state) { | |
276 | set_current_state(TASK_INTERRUPTIBLE); | |
277 | ||
278 | if (!timeo) { | |
279 | err = -EAGAIN; | |
280 | break; | |
281 | } | |
282 | ||
283 | if (signal_pending(current)) { | |
284 | err = sock_intr_errno(timeo); | |
285 | break; | |
286 | } | |
287 | ||
288 | release_sock(sk); | |
289 | timeo = schedule_timeout(timeo); | |
290 | lock_sock(sk); | |
291 | ||
c1cbe4b7 BL |
292 | err = sock_error(sk); |
293 | if (err) | |
1da177e4 | 294 | break; |
1da177e4 LT |
295 | } |
296 | set_current_state(TASK_RUNNING); | |
297 | remove_wait_queue(sk->sk_sleep, &wait); | |
298 | return err; | |
299 | } | |
300 | EXPORT_SYMBOL(bt_sock_wait_state); | |
301 | ||
302 | static struct net_proto_family bt_sock_family_ops = { | |
303 | .owner = THIS_MODULE, | |
304 | .family = PF_BLUETOOTH, | |
305 | .create = bt_sock_create, | |
306 | }; | |
307 | ||
1da177e4 LT |
308 | static int __init bt_init(void) |
309 | { | |
310 | BT_INFO("Core ver %s", VERSION); | |
311 | ||
1da177e4 LT |
312 | sock_register(&bt_sock_family_ops); |
313 | ||
314 | BT_INFO("HCI device and connection manager initialized"); | |
315 | ||
316 | bt_sysfs_init(); | |
317 | ||
318 | hci_sock_init(); | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | static void __exit bt_exit(void) | |
324 | { | |
325 | hci_sock_cleanup(); | |
326 | ||
327 | bt_sysfs_cleanup(); | |
328 | ||
329 | sock_unregister(PF_BLUETOOTH); | |
1da177e4 LT |
330 | } |
331 | ||
332 | subsys_initcall(bt_init); | |
333 | module_exit(bt_exit); | |
334 | ||
335 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); | |
336 | MODULE_DESCRIPTION("Bluetooth Core ver " VERSION); | |
337 | MODULE_VERSION(VERSION); | |
338 | MODULE_LICENSE("GPL"); | |
339 | MODULE_ALIAS_NETPROTO(PF_BLUETOOTH); |