net/bluetooth/af_bluetooth.c

   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/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/slab.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/init.h>
  37 #include <linux/poll.h>
  38 #include <net/sock.h>
  39 #include <asm/ioctls.h>
  40 #include <linux/kmod.h>
  41
  42 #include <net/bluetooth/bluetooth.h>
  43
  44 #define VERSION "2.15"
  45
  46 /* Bluetooth sockets */
  47 #define BT_MAX_PROTO    8
  48 static struct net_proto_family *bt_proto[BT_MAX_PROTO];
  49 static DEFINE_RWLOCK(bt_proto_lock);
  50
  51 static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
  52 static const char *bt_key_strings[BT_MAX_PROTO] = {
  53         "sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
  54         "sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
  55         "sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
  56         "sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
  57         "sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
  58         "sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
  59         "sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
  60         "sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
  61 };
  62
  63 static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
  64 static const char *bt_slock_key_strings[BT_MAX_PROTO] = {
  65         "slock-AF_BLUETOOTH-BTPROTO_L2CAP",
  66         "slock-AF_BLUETOOTH-BTPROTO_HCI",
  67         "slock-AF_BLUETOOTH-BTPROTO_SCO",
  68         "slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
  69         "slock-AF_BLUETOOTH-BTPROTO_BNEP",
  70         "slock-AF_BLUETOOTH-BTPROTO_CMTP",
  71         "slock-AF_BLUETOOTH-BTPROTO_HIDP",
  72         "slock-AF_BLUETOOTH-BTPROTO_AVDTP",
  73 };
  74
  75 static inline void bt_sock_reclassify_lock(struct socket *sock, int proto)
  76 {
  77         struct sock *sk = sock->sk;
  78
  79         if (!sk)
  80                 return;
  81
  82         BUG_ON(sock_owned_by_user(sk));
  83
  84         sock_lock_init_class_and_name(sk,
  85                         bt_slock_key_strings[proto], &bt_slock_key[proto],
  86                                 bt_key_strings[proto], &bt_lock_key[proto]);
  87 }
  88
  89 int bt_sock_register(int proto, struct net_proto_family *ops)
  90 {
  91         int err = 0;
  92
  93         if (proto < 0 || proto >= BT_MAX_PROTO)
  94                 return -EINVAL;
  95
  96         write_lock(&bt_proto_lock);
  97
  98         if (bt_proto[proto])
  99                 err = -EEXIST;
 100         else
 101                 bt_proto[proto] = ops;
 102
 103         write_unlock(&bt_proto_lock);
 104
 105         return err;
 106 }
 107 EXPORT_SYMBOL(bt_sock_register);
 108
 109 int bt_sock_unregister(int proto)
 110 {
 111         int err = 0;
 112
 113         if (proto < 0 || proto >= BT_MAX_PROTO)
 114                 return -EINVAL;
 115
 116         write_lock(&bt_proto_lock);
 117
 118         if (!bt_proto[proto])
 119                 err = -ENOENT;
 120         else
 121                 bt_proto[proto] = NULL;
 122
 123         write_unlock(&bt_proto_lock);
 124
 125         return err;
 126 }
 127 EXPORT_SYMBOL(bt_sock_unregister);
 128
 129 static int bt_sock_create(struct net *net, struct socket *sock, int proto)
 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);
 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
 157 void 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 }
 163 EXPORT_SYMBOL(bt_sock_link);
 164
 165 void 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 }
 171 EXPORT_SYMBOL(bt_sock_unlink);
 172
 173 void 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 }
 182 EXPORT_SYMBOL(bt_accept_enqueue);
 183
 184 void 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 }
 193 EXPORT_SYMBOL(bt_accept_unlink);
 194
 195 struct 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                 /* FIXME: Is this check still needed */
 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 }
 227 EXPORT_SYMBOL(bt_accept_dequeue);
 228
 229 int 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_timestamp(msg, sk, skb);
 261
 262         skb_free_datagram(sk, skb);
 263
 264         return err ? : copied;
 265 }
 266 EXPORT_SYMBOL(bt_sock_recvmsg);
 267
 268 static 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
 284 unsigned 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->sk_sleep, 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 }
 324 EXPORT_SYMBOL(bt_sock_poll);
 325
 326 int 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 - atomic_read(&sk->sk_wmem_alloc);
 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 }
 372 EXPORT_SYMBOL(bt_sock_ioctl);
 373
 374 int 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->sk_sleep, &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->sk_sleep, &wait);
 405         return err;
 406 }
 407 EXPORT_SYMBOL(bt_sock_wait_state);
 408
 409 static struct net_proto_family bt_sock_family_ops = {
 410         .owner  = THIS_MODULE,
 411         .family = PF_BLUETOOTH,
 412         .create = bt_sock_create,
 413 };
 414
 415 static 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
 438 static void __exit bt_exit(void)
 439 {
 440         hci_sock_cleanup();
 441
 442         sock_unregister(PF_BLUETOOTH);
 443
 444         bt_sysfs_cleanup();
 445 }
 446
 447 subsys_initcall(bt_init);
 448 module_exit(bt_exit);
 449
 450 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 451 MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
 452 MODULE_VERSION(VERSION);
 453 MODULE_LICENSE("GPL");
 454 MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);