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Linux/net/bluetooth/af_bluetooth.c

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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 /*
 26  * BlueZ Bluetooth address family and sockets.
 27  *
 28  * $Id: af_bluetooth.c,v 1.8 2002/07/22 20:32:54 maxk Exp $
 29  */
 30 #define VERSION "2.4"
 31 
 32 #include <linux/config.h>
 33 #include <linux/module.h>
 34 
 35 #include <linux/types.h>
 36 #include <linux/list.h>
 37 #include <linux/errno.h>
 38 #include <linux/kernel.h>
 39 #include <linux/major.h>
 40 #include <linux/sched.h>
 41 #include <linux/slab.h>
 42 #include <linux/skbuff.h>
 43 #include <linux/init.h>
 44 #include <linux/poll.h>
 45 #include <linux/proc_fs.h>
 46 #include <net/sock.h>
 47 
 48 #if defined(CONFIG_KMOD)
 49 #include <linux/kmod.h>
 50 #endif
 51 
 52 #include <net/bluetooth/bluetooth.h>
 53 
 54 #ifndef AF_BLUETOOTH_DEBUG
 55 #undef  BT_DBG
 56 #define BT_DBG( A... )
 57 #endif
 58 
 59 /* Bluetooth sockets */
 60 #define BLUEZ_MAX_PROTO 7
 61 static struct net_proto_family *bluez_proto[BLUEZ_MAX_PROTO];
 62 
 63 int bluez_sock_register(int proto, struct net_proto_family *ops)
 64 {
 65         if (proto < 0 || proto >= BLUEZ_MAX_PROTO)
 66                 return -EINVAL;
 67 
 68         if (bluez_proto[proto])
 69                 return -EEXIST;
 70 
 71         bluez_proto[proto] = ops;
 72         return 0;
 73 }
 74 
 75 int bluez_sock_unregister(int proto)
 76 {
 77         if (proto < 0 || proto >= BLUEZ_MAX_PROTO)
 78                 return -EINVAL;
 79 
 80         if (!bluez_proto[proto])
 81                 return -ENOENT;
 82 
 83         bluez_proto[proto] = NULL;
 84         return 0;
 85 }
 86 
 87 static int bluez_sock_create(struct socket *sock, int proto)
 88 {
 89         if (proto < 0 || proto >= BLUEZ_MAX_PROTO)
 90                 return -EINVAL;
 91 
 92 #if defined(CONFIG_KMOD)
 93         if (!bluez_proto[proto]) {
 94                 char module_name[30];
 95                 sprintf(module_name, "bt-proto-%d", proto);
 96                 request_module(module_name);
 97         }
 98 #endif
 99 
100         if (!bluez_proto[proto])
101                 return -ENOENT;
102 
103         return bluez_proto[proto]->create(sock, proto);
104 }
105 
106 void bluez_sock_init(struct socket *sock, struct sock *sk)
107 { 
108         sock_init_data(sock, sk);
109         INIT_LIST_HEAD(&bluez_pi(sk)->accept_q);
110 }
111 
112 void bluez_sock_link(struct bluez_sock_list *l, struct sock *sk)
113 {
114         write_lock_bh(&l->lock);
115         sk->next = l->head;
116         l->head = sk;
117         sock_hold(sk);
118         write_unlock_bh(&l->lock);
119 }
120 
121 void bluez_sock_unlink(struct bluez_sock_list *l, struct sock *sk)
122 {
123         struct sock **skp;
124 
125         write_lock_bh(&l->lock);
126         for (skp = &l->head; *skp; skp = &((*skp)->next)) {
127                 if (*skp == sk) {
128                         *skp = sk->next;
129                         __sock_put(sk);
130                         break;
131                 }
132         }
133         write_unlock_bh(&l->lock);
134 }
135 
136 void bluez_accept_enqueue(struct sock *parent, struct sock *sk)
137 {
138         BT_DBG("parent %p, sk %p", parent, sk);
139 
140         sock_hold(sk);
141         list_add_tail(&bluez_pi(sk)->accept_q, &bluez_pi(parent)->accept_q);
142         bluez_pi(sk)->parent = parent;
143         parent->ack_backlog++;
144 }
145 
146 static void bluez_accept_unlink(struct sock *sk)
147 {
148         BT_DBG("sk %p state %d", sk, sk->state);
149 
150         list_del_init(&bluez_pi(sk)->accept_q);
151         bluez_pi(sk)->parent->ack_backlog--;
152         bluez_pi(sk)->parent = NULL;
153         sock_put(sk);
154 }
155 
156 struct sock *bluez_accept_dequeue(struct sock *parent, struct socket *newsock)
157 {
158         struct list_head *p, *n;
159         struct bluez_pinfo *pi;
160         struct sock *sk;
161         
162         BT_DBG("parent %p", parent);
163 
164         list_for_each_safe(p, n, &bluez_pi(parent)->accept_q) {
165                 pi = list_entry(p, struct bluez_pinfo, accept_q);
166                 sk = bluez_sk(pi);
167                 
168                 lock_sock(sk);
169                 if (sk->state == BT_CLOSED) {
170                         release_sock(sk);
171                         bluez_accept_unlink(sk);
172                         continue;
173                 }
174                 
175                 if (sk->state == BT_CONNECTED || !newsock) {
176                         bluez_accept_unlink(sk);
177                         if (newsock)
178                                 sock_graft(sk, newsock);
179                         release_sock(sk);
180                         return sk;
181                 }
182                 release_sock(sk);
183         }
184         return NULL;
185 }
186 
187 int bluez_sock_recvmsg(struct socket *sock, struct msghdr *msg, int len, int flags, struct scm_cookie *scm)
188 {
189         int noblock = flags & MSG_DONTWAIT;
190         struct sock *sk = sock->sk;
191         struct sk_buff *skb;
192         int copied, err;
193 
194         BT_DBG("sock %p sk %p len %d", sock, sk, len);
195 
196         if (flags & (MSG_OOB))
197                 return -EOPNOTSUPP;
198 
199         if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) {
200                 if (sk->shutdown & RCV_SHUTDOWN)
201                         return 0;
202                 return err;
203         }
204 
205         msg->msg_namelen = 0;
206 
207         copied = skb->len;
208         if (len < copied) {
209                 msg->msg_flags |= MSG_TRUNC;
210                 copied = len;
211         }
212 
213         skb->h.raw = skb->data;
214         err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
215 
216         skb_free_datagram(sk, skb);
217 
218         return err ? : copied;
219 }
220 
221 unsigned int bluez_sock_poll(struct file * file, struct socket *sock, poll_table *wait)
222 {
223         struct sock *sk = sock->sk;
224         unsigned int mask = 0;
225 
226         BT_DBG("sock %p, sk %p", sock, sk);
227 
228         poll_wait(file, sk->sleep, wait);
229 
230         if (sk->err || !skb_queue_empty(&sk->error_queue))
231                 mask |= POLLERR;
232 
233         if (sk->shutdown == SHUTDOWN_MASK)
234                 mask |= POLLHUP;
235 
236         if (!skb_queue_empty(&sk->receive_queue) || 
237                         !list_empty(&bluez_pi(sk)->accept_q) ||
238                         (sk->shutdown & RCV_SHUTDOWN))
239                 mask |= POLLIN | POLLRDNORM;
240 
241         if (sk->state == BT_CLOSED)
242                 mask |= POLLHUP;
243 
244         if (sk->state == BT_CONNECT ||
245                         sk->state == BT_CONNECT2 ||
246                         sk->state == BT_CONFIG)
247                 return mask;
248 
249         if (sock_writeable(sk))
250                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
251         else
252                 set_bit(SOCK_ASYNC_NOSPACE, &sk->socket->flags);
253 
254         return mask;
255 }
256 
257 int bluez_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
258 {
259         DECLARE_WAITQUEUE(wait, current);
260         int err = 0;
261 
262         BT_DBG("sk %p", sk);
263 
264         add_wait_queue(sk->sleep, &wait);
265         while (sk->state != state) {
266                 set_current_state(TASK_INTERRUPTIBLE);
267 
268                 if (!timeo) {
269                         err = -EAGAIN;
270                         break;
271                 }
272 
273                 if (signal_pending(current)) {
274                         err = sock_intr_errno(timeo);
275                         break;
276                 }
277 
278                 release_sock(sk);
279                 timeo = schedule_timeout(timeo);
280                 lock_sock(sk);
281 
282                 if (sk->err) {
283                         err = sock_error(sk);
284                         break;
285                 }
286         }
287         set_current_state(TASK_RUNNING);
288         remove_wait_queue(sk->sleep, &wait);
289         return err;
290 }
291 
292 struct net_proto_family bluez_sock_family_ops =
293 {
294         PF_BLUETOOTH, bluez_sock_create
295 };
296 
297 int bluez_init(void)
298 {
299         BT_INFO("BlueZ Core ver %s Copyright (C) 2000,2001 Qualcomm Inc",
300                  VERSION);
301         BT_INFO("Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>");
302 
303         proc_mkdir("bluetooth", NULL);
304 
305         sock_register(&bluez_sock_family_ops);
306 
307         /* Init HCI Core */
308         hci_core_init();
309 
310         /* Init sockets */
311         hci_sock_init();
312 
313         return 0;
314 }
315 
316 void bluez_cleanup(void)
317 {
318         /* Release socket */
319         hci_sock_cleanup();
320 
321         /* Release core */
322         hci_core_cleanup();
323 
324         sock_unregister(PF_BLUETOOTH);
325 
326         remove_proc_entry("bluetooth", NULL);
327 }
328 
329 #ifdef MODULE
330 module_init(bluez_init);
331 module_exit(bluez_cleanup);
332 
333 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>");
334 MODULE_DESCRIPTION("BlueZ Core ver " VERSION);
335 MODULE_LICENSE("GPL");
336 #endif
337 

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