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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>
33#include <linux/sched.h>
34#include <linux/skbuff.h>
35#include <linux/init.h>
36#include <linux/poll.h>
37#include <net/sock.h>
38#include <asm/ioctls.h>
39#include <linux/kmod.h>
40
41#include <net/bluetooth/bluetooth.h>
42
43#define VERSION "2.15"
44
45
46#define BT_MAX_PROTO 8
47static const struct net_proto_family *bt_proto[BT_MAX_PROTO];
48static DEFINE_RWLOCK(bt_proto_lock);
49
50static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
51static const char *const bt_key_strings[BT_MAX_PROTO] = {
52 "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
53 "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
54 "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
55 "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
56 "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
57 "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
58 "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
59 "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
60};
61
62static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
63static const char *const bt_slock_key_strings[BT_MAX_PROTO] = {
64 "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
65 "slock-AF_BLUETOOTH-BTPROTO_HCI",
66 "slock-AF_BLUETOOTH-BTPROTO_SCO",
67 "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
68 "slock-AF_BLUETOOTH-BTPROTO_BNEP",
69 "slock-AF_BLUETOOTH-BTPROTO_CMTP",
70 "slock-AF_BLUETOOTH-BTPROTO_HIDP",
71 "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
72};
73
74static inline void bt_sock_reclassify_lock(struct socket *sock, int proto)
75{
76 struct sock *sk = sock->sk;
77
78 if (!sk)
79 return;
80
81 BUG_ON(sock_owned_by_user(sk));
82
83 sock_lock_init_class_and_name(sk,
84 bt_slock_key_strings[proto], &bt_slock_key[proto],
85 bt_key_strings[proto], &bt_lock_key[proto]);
86}
87
88int bt_sock_register(int proto, const struct net_proto_family *ops)
89{
90 int err = 0;
91
92 if (proto < 0 || proto >= BT_MAX_PROTO)
93 return -EINVAL;
94
95 write_lock(&bt_proto_lock);
96
97 if (bt_proto[proto])
98 err = -EEXIST;
99 else
100 bt_proto[proto] = ops;
101
102 write_unlock(&bt_proto_lock);
103
104 return err;
105}
106EXPORT_SYMBOL(bt_sock_register);
107
108int bt_sock_unregister(int proto)
109{
110 int err = 0;
111
112 if (proto < 0 || proto >= BT_MAX_PROTO)
113 return -EINVAL;
114
115 write_lock(&bt_proto_lock);
116
117 if (!bt_proto[proto])
118 err = -ENOENT;
119 else
120 bt_proto[proto] = NULL;
121
122 write_unlock(&bt_proto_lock);
123
124 return err;
125}
126EXPORT_SYMBOL(bt_sock_unregister);
127
128static int bt_sock_create(struct net *net, struct socket *sock, int proto,
129 int kern)
130{
131 int err;
132
133 if (net != &init_net)
134 return -EAFNOSUPPORT;
135
136 if (proto < 0 || proto >= BT_MAX_PROTO)
137 return -EINVAL;
138
139 if (!bt_proto[proto])
140 request_module("bt-proto-%d", proto);
141
142 err = -EPROTONOSUPPORT;
143
144 read_lock(&bt_proto_lock);
145
146 if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
147 err = bt_proto[proto]->create(net, sock, proto, kern);
148 bt_sock_reclassify_lock(sock, proto);
149 module_put(bt_proto[proto]->owner);
150 }
151
152 read_unlock(&bt_proto_lock);
153
154 return err;
155}
156
157void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
158{
159 write_lock_bh(&l->lock);
160 sk_add_node(sk, &l->head);
161 write_unlock_bh(&l->lock);
162}
163EXPORT_SYMBOL(bt_sock_link);
164
165void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
166{
167 write_lock_bh(&l->lock);
168 sk_del_node_init(sk);
169 write_unlock_bh(&l->lock);
170}
171EXPORT_SYMBOL(bt_sock_unlink);
172
173void bt_accept_enqueue(struct sock *parent, struct sock *sk)
174{
175 BT_DBG("parent %p, sk %p", parent, sk);
176
177 sock_hold(sk);
178 list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
179 bt_sk(sk)->parent = parent;
180 parent->sk_ack_backlog++;
181}
182EXPORT_SYMBOL(bt_accept_enqueue);
183
184void bt_accept_unlink(struct sock *sk)
185{
186 BT_DBG("sk %p state %d", sk, sk->sk_state);
187
188 list_del_init(&bt_sk(sk)->accept_q);
189 bt_sk(sk)->parent->sk_ack_backlog--;
190 bt_sk(sk)->parent = NULL;
191 sock_put(sk);
192}
193EXPORT_SYMBOL(bt_accept_unlink);
194
195struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
196{
197 struct list_head *p, *n;
198 struct sock *sk;
199
200 BT_DBG("parent %p", parent);
201
202 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
203 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
204
205 lock_sock(sk);
206
207
208 if (sk->sk_state == BT_CLOSED) {
209 release_sock(sk);
210 bt_accept_unlink(sk);
211 continue;
212 }
213
214 if (sk->sk_state == BT_CONNECTED || !newsock ||
215 bt_sk(parent)->defer_setup) {
216 bt_accept_unlink(sk);
217 if (newsock)
218 sock_graft(sk, newsock);
219 release_sock(sk);
220 return sk;
221 }
222
223 release_sock(sk);
224 }
225 return NULL;
226}
227EXPORT_SYMBOL(bt_accept_dequeue);
228
229int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
230 struct msghdr *msg, size_t len, int flags)
231{
232 int noblock = flags & MSG_DONTWAIT;
233 struct sock *sk = sock->sk;
234 struct sk_buff *skb;
235 size_t copied;
236 int err;
237
238 BT_DBG("sock %p sk %p len %zu", sock, sk, len);
239
240 if (flags & (MSG_OOB))
241 return -EOPNOTSUPP;
242
243 if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) {
244 if (sk->sk_shutdown & RCV_SHUTDOWN)
245 return 0;
246 return err;
247 }
248
249 msg->msg_namelen = 0;
250
251 copied = skb->len;
252 if (len < copied) {
253 msg->msg_flags |= MSG_TRUNC;
254 copied = len;
255 }
256
257 skb_reset_transport_header(skb);
258 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
259 if (err == 0)
260 sock_recv_ts_and_drops(msg, sk, skb);
261
262 skb_free_datagram(sk, skb);
263
264 return err ? : copied;
265}
266EXPORT_SYMBOL(bt_sock_recvmsg);
267
268static inline unsigned int bt_accept_poll(struct sock *parent)
269{
270 struct list_head *p, *n;
271 struct sock *sk;
272
273 list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
274 sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
275 if (sk->sk_state == BT_CONNECTED ||
276 (bt_sk(parent)->defer_setup &&
277 sk->sk_state == BT_CONNECT2))
278 return POLLIN | POLLRDNORM;
279 }
280
281 return 0;
282}
283
284unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait)
285{
286 struct sock *sk = sock->sk;
287 unsigned int mask = 0;
288
289 BT_DBG("sock %p, sk %p", sock, sk);
290
291 poll_wait(file, sk_sleep(sk), wait);
292
293 if (sk->sk_state == BT_LISTEN)
294 return bt_accept_poll(sk);
295
296 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
297 mask |= POLLERR;
298
299 if (sk->sk_shutdown & RCV_SHUTDOWN)
300 mask |= POLLRDHUP;
301
302 if (sk->sk_shutdown == SHUTDOWN_MASK)
303 mask |= POLLHUP;
304
305 if (!skb_queue_empty(&sk->sk_receive_queue) ||
306 (sk->sk_shutdown & RCV_SHUTDOWN))
307 mask |= POLLIN | POLLRDNORM;
308
309 if (sk->sk_state == BT_CLOSED)
310 mask |= POLLHUP;
311
312 if (sk->sk_state == BT_CONNECT ||
313 sk->sk_state == BT_CONNECT2 ||
314 sk->sk_state == BT_CONFIG)
315 return mask;
316
317 if (sock_writeable(sk))
318 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
319 else
320 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
321
322 return mask;
323}
324EXPORT_SYMBOL(bt_sock_poll);
325
326int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
327{
328 struct sock *sk = sock->sk;
329 struct sk_buff *skb;
330 long amount;
331 int err;
332
333 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
334
335 switch (cmd) {
336 case TIOCOUTQ:
337 if (sk->sk_state == BT_LISTEN)
338 return -EINVAL;
339
340 amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
341 if (amount < 0)
342 amount = 0;
343 err = put_user(amount, (int __user *) arg);
344 break;
345
346 case TIOCINQ:
347 if (sk->sk_state == BT_LISTEN)
348 return -EINVAL;
349
350 lock_sock(sk);
351 skb = skb_peek(&sk->sk_receive_queue);
352 amount = skb ? skb->len : 0;
353 release_sock(sk);
354 err = put_user(amount, (int __user *) arg);
355 break;
356
357 case SIOCGSTAMP:
358 err = sock_get_timestamp(sk, (struct timeval __user *) arg);
359 break;
360
361 case SIOCGSTAMPNS:
362 err = sock_get_timestampns(sk, (struct timespec __user *) arg);
363 break;
364
365 default:
366 err = -ENOIOCTLCMD;
367 break;
368 }
369
370 return err;
371}
372EXPORT_SYMBOL(bt_sock_ioctl);
373
374int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
375{
376 DECLARE_WAITQUEUE(wait, current);
377 int err = 0;
378
379 BT_DBG("sk %p", sk);
380
381 add_wait_queue(sk_sleep(sk), &wait);
382 while (sk->sk_state != state) {
383 set_current_state(TASK_INTERRUPTIBLE);
384
385 if (!timeo) {
386 err = -EINPROGRESS;
387 break;
388 }
389
390 if (signal_pending(current)) {
391 err = sock_intr_errno(timeo);
392 break;
393 }
394
395 release_sock(sk);
396 timeo = schedule_timeout(timeo);
397 lock_sock(sk);
398
399 err = sock_error(sk);
400 if (err)
401 break;
402 }
403 set_current_state(TASK_RUNNING);
404 remove_wait_queue(sk_sleep(sk), &wait);
405 return err;
406}
407EXPORT_SYMBOL(bt_sock_wait_state);
408
409static struct net_proto_family bt_sock_family_ops = {
410 .owner = THIS_MODULE,
411 .family = PF_BLUETOOTH,
412 .create = bt_sock_create,
413};
414
415static int __init bt_init(void)
416{
417 int err;
418
419 BT_INFO("Core ver %s", VERSION);
420
421 err = bt_sysfs_init();
422 if (err < 0)
423 return err;
424
425 err = sock_register(&bt_sock_family_ops);
426 if (err < 0) {
427 bt_sysfs_cleanup();
428 return err;
429 }
430
431 BT_INFO("HCI device and connection manager initialized");
432
433 hci_sock_init();
434
435 return 0;
436}
437
438static void __exit bt_exit(void)
439{
440 hci_sock_cleanup();
441
442 sock_unregister(PF_BLUETOOTH);
443
444 bt_sysfs_cleanup();
445}
446
447subsys_initcall(bt_init);
448module_exit(bt_exit);
449
450MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
451MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
452MODULE_VERSION(VERSION);
453MODULE_LICENSE("GPL");
454MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);
455
