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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 | ||
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> | |
1da177e4 LT |
34 | #include <linux/sched.h> |
35 | #include <linux/slab.h> | |
36 | #include <linux/skbuff.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/poll.h> | |
1da177e4 LT |
39 | #include <net/sock.h> |
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 | ||
be9d1227 | 52 | #define VERSION "2.8" |
1da177e4 LT |
53 | |
54 | /* Bluetooth sockets */ | |
55 | #define BT_MAX_PROTO 8 | |
56 | static struct net_proto_family *bt_proto[BT_MAX_PROTO]; | |
57 | ||
58 | int bt_sock_register(int proto, struct net_proto_family *ops) | |
59 | { | |
60 | if (proto < 0 || proto >= BT_MAX_PROTO) | |
61 | return -EINVAL; | |
62 | ||
63 | if (bt_proto[proto]) | |
64 | return -EEXIST; | |
65 | ||
66 | bt_proto[proto] = ops; | |
67 | return 0; | |
68 | } | |
69 | EXPORT_SYMBOL(bt_sock_register); | |
70 | ||
71 | int bt_sock_unregister(int proto) | |
72 | { | |
73 | if (proto < 0 || proto >= BT_MAX_PROTO) | |
74 | return -EINVAL; | |
75 | ||
76 | if (!bt_proto[proto]) | |
77 | return -ENOENT; | |
78 | ||
79 | bt_proto[proto] = NULL; | |
80 | return 0; | |
81 | } | |
82 | EXPORT_SYMBOL(bt_sock_unregister); | |
83 | ||
84 | static int bt_sock_create(struct socket *sock, int proto) | |
85 | { | |
86 | int err = 0; | |
87 | ||
88 | if (proto < 0 || proto >= BT_MAX_PROTO) | |
89 | return -EINVAL; | |
90 | ||
91 | #if defined(CONFIG_KMOD) | |
92 | if (!bt_proto[proto]) { | |
93 | request_module("bt-proto-%d", proto); | |
94 | } | |
95 | #endif | |
96 | err = -EPROTONOSUPPORT; | |
97 | if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) { | |
98 | err = bt_proto[proto]->create(sock, proto); | |
99 | module_put(bt_proto[proto]->owner); | |
100 | } | |
101 | return err; | |
102 | } | |
103 | ||
104 | void bt_sock_link(struct bt_sock_list *l, struct sock *sk) | |
105 | { | |
106 | write_lock_bh(&l->lock); | |
107 | sk_add_node(sk, &l->head); | |
108 | write_unlock_bh(&l->lock); | |
109 | } | |
110 | EXPORT_SYMBOL(bt_sock_link); | |
111 | ||
112 | void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk) | |
113 | { | |
114 | write_lock_bh(&l->lock); | |
115 | sk_del_node_init(sk); | |
116 | write_unlock_bh(&l->lock); | |
117 | } | |
118 | EXPORT_SYMBOL(bt_sock_unlink); | |
119 | ||
120 | void bt_accept_enqueue(struct sock *parent, struct sock *sk) | |
121 | { | |
122 | BT_DBG("parent %p, sk %p", parent, sk); | |
123 | ||
124 | sock_hold(sk); | |
125 | list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q); | |
126 | bt_sk(sk)->parent = parent; | |
127 | parent->sk_ack_backlog++; | |
128 | } | |
129 | EXPORT_SYMBOL(bt_accept_enqueue); | |
130 | ||
131 | void bt_accept_unlink(struct sock *sk) | |
132 | { | |
133 | BT_DBG("sk %p state %d", sk, sk->sk_state); | |
134 | ||
135 | list_del_init(&bt_sk(sk)->accept_q); | |
136 | bt_sk(sk)->parent->sk_ack_backlog--; | |
137 | bt_sk(sk)->parent = NULL; | |
138 | sock_put(sk); | |
139 | } | |
140 | EXPORT_SYMBOL(bt_accept_unlink); | |
141 | ||
142 | struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock) | |
143 | { | |
144 | struct list_head *p, *n; | |
145 | struct sock *sk; | |
146 | ||
147 | BT_DBG("parent %p", parent); | |
148 | ||
149 | list_for_each_safe(p, n, &bt_sk(parent)->accept_q) { | |
150 | sk = (struct sock *) list_entry(p, struct bt_sock, accept_q); | |
151 | ||
152 | lock_sock(sk); | |
153 | ||
154 | /* FIXME: Is this check still needed */ | |
155 | if (sk->sk_state == BT_CLOSED) { | |
156 | release_sock(sk); | |
157 | bt_accept_unlink(sk); | |
158 | continue; | |
159 | } | |
160 | ||
161 | if (sk->sk_state == BT_CONNECTED || !newsock) { | |
162 | bt_accept_unlink(sk); | |
163 | if (newsock) | |
164 | sock_graft(sk, newsock); | |
165 | release_sock(sk); | |
166 | return sk; | |
167 | } | |
168 | ||
169 | release_sock(sk); | |
170 | } | |
171 | return NULL; | |
172 | } | |
173 | EXPORT_SYMBOL(bt_accept_dequeue); | |
174 | ||
175 | int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
176 | struct msghdr *msg, size_t len, int flags) | |
177 | { | |
178 | int noblock = flags & MSG_DONTWAIT; | |
179 | struct sock *sk = sock->sk; | |
180 | struct sk_buff *skb; | |
181 | size_t copied; | |
182 | int err; | |
183 | ||
184 | BT_DBG("sock %p sk %p len %d", sock, sk, len); | |
185 | ||
186 | if (flags & (MSG_OOB)) | |
187 | return -EOPNOTSUPP; | |
188 | ||
189 | if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) { | |
190 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
191 | return 0; | |
192 | return err; | |
193 | } | |
194 | ||
195 | msg->msg_namelen = 0; | |
196 | ||
197 | copied = skb->len; | |
198 | if (len < copied) { | |
199 | msg->msg_flags |= MSG_TRUNC; | |
200 | copied = len; | |
201 | } | |
202 | ||
203 | skb->h.raw = skb->data; | |
204 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
205 | ||
206 | skb_free_datagram(sk, skb); | |
207 | ||
208 | return err ? : copied; | |
209 | } | |
210 | EXPORT_SYMBOL(bt_sock_recvmsg); | |
211 | ||
212 | static inline unsigned int bt_accept_poll(struct sock *parent) | |
213 | { | |
214 | struct list_head *p, *n; | |
215 | struct sock *sk; | |
216 | ||
217 | list_for_each_safe(p, n, &bt_sk(parent)->accept_q) { | |
218 | sk = (struct sock *) list_entry(p, struct bt_sock, accept_q); | |
219 | if (sk->sk_state == BT_CONNECTED) | |
220 | return POLLIN | POLLRDNORM; | |
221 | } | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait) | |
227 | { | |
228 | struct sock *sk = sock->sk; | |
229 | unsigned int mask = 0; | |
230 | ||
231 | BT_DBG("sock %p, sk %p", sock, sk); | |
232 | ||
233 | poll_wait(file, sk->sk_sleep, wait); | |
234 | ||
235 | if (sk->sk_state == BT_LISTEN) | |
236 | return bt_accept_poll(sk); | |
237 | ||
238 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
239 | mask |= POLLERR; | |
240 | ||
241 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
242 | mask |= POLLHUP; | |
243 | ||
244 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
245 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
246 | mask |= POLLIN | POLLRDNORM; | |
247 | ||
248 | if (sk->sk_state == BT_CLOSED) | |
249 | mask |= POLLHUP; | |
250 | ||
251 | if (sk->sk_state == BT_CONNECT || | |
252 | sk->sk_state == BT_CONNECT2 || | |
253 | sk->sk_state == BT_CONFIG) | |
254 | return mask; | |
255 | ||
256 | if (sock_writeable(sk)) | |
257 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
258 | else | |
259 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
260 | ||
261 | return mask; | |
262 | } | |
263 | EXPORT_SYMBOL(bt_sock_poll); | |
264 | ||
265 | int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo) | |
266 | { | |
267 | DECLARE_WAITQUEUE(wait, current); | |
268 | int err = 0; | |
269 | ||
270 | BT_DBG("sk %p", sk); | |
271 | ||
272 | add_wait_queue(sk->sk_sleep, &wait); | |
273 | while (sk->sk_state != state) { | |
274 | set_current_state(TASK_INTERRUPTIBLE); | |
275 | ||
276 | if (!timeo) { | |
277 | err = -EAGAIN; | |
278 | break; | |
279 | } | |
280 | ||
281 | if (signal_pending(current)) { | |
282 | err = sock_intr_errno(timeo); | |
283 | break; | |
284 | } | |
285 | ||
286 | release_sock(sk); | |
287 | timeo = schedule_timeout(timeo); | |
288 | lock_sock(sk); | |
289 | ||
c1cbe4b7 BL |
290 | err = sock_error(sk); |
291 | if (err) | |
1da177e4 | 292 | break; |
1da177e4 LT |
293 | } |
294 | set_current_state(TASK_RUNNING); | |
295 | remove_wait_queue(sk->sk_sleep, &wait); | |
296 | return err; | |
297 | } | |
298 | EXPORT_SYMBOL(bt_sock_wait_state); | |
299 | ||
300 | static struct net_proto_family bt_sock_family_ops = { | |
301 | .owner = THIS_MODULE, | |
302 | .family = PF_BLUETOOTH, | |
303 | .create = bt_sock_create, | |
304 | }; | |
305 | ||
1da177e4 LT |
306 | static int __init bt_init(void) |
307 | { | |
308 | BT_INFO("Core ver %s", VERSION); | |
309 | ||
1da177e4 LT |
310 | sock_register(&bt_sock_family_ops); |
311 | ||
312 | BT_INFO("HCI device and connection manager initialized"); | |
313 | ||
314 | bt_sysfs_init(); | |
315 | ||
316 | hci_sock_init(); | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
321 | static void __exit bt_exit(void) | |
322 | { | |
323 | hci_sock_cleanup(); | |
324 | ||
325 | bt_sysfs_cleanup(); | |
326 | ||
327 | sock_unregister(PF_BLUETOOTH); | |
1da177e4 LT |
328 | } |
329 | ||
330 | subsys_initcall(bt_init); | |
331 | module_exit(bt_exit); | |
332 | ||
333 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); | |
334 | MODULE_DESCRIPTION("Bluetooth Core ver " VERSION); | |
335 | MODULE_VERSION(VERSION); | |
336 | MODULE_LICENSE("GPL"); | |
337 | MODULE_ALIAS_NETPROTO(PF_BLUETOOTH); |