net/bluetooth/rfcomm/sock.c

   1 /*
   2    RFCOMM implementation for Linux Bluetooth stack (BlueZ).
   3    Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
   4    Copyright (C) 2002 Marcel Holtmann <marcel@holtmann.org>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License version 2 as
   8    published by the Free Software Foundation;
   9
  10    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  11    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  12    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  13    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  14    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  15    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18
  19    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  20    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  21    SOFTWARE IS DISCLAIMED.
  22 */
  23
  24 /*
  25  * RFCOMM sockets.
  26  *
  27  * $Id: sock.c,v 1.24 2002/10/03 01:00:34 maxk Exp $
  28  */
  29
  30 #include <linux/module.h>
  31
  32 #include <linux/types.h>
  33 #include <linux/errno.h>
  34 #include <linux/kernel.h>
  35 #include <linux/sched.h>
  36 #include <linux/slab.h>
  37 #include <linux/poll.h>
  38 #include <linux/fcntl.h>
  39 #include <linux/init.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/socket.h>
  42 #include <linux/skbuff.h>
  43 #include <linux/list.h>
  44 #include <linux/device.h>
  45 #include <net/sock.h>
  46
  47 #include <asm/system.h>
  48 #include <asm/uaccess.h>
  49
  50 #include <net/bluetooth/bluetooth.h>
  51 #include <net/bluetooth/hci_core.h>
  52 #include <net/bluetooth/l2cap.h>
  53 #include <net/bluetooth/rfcomm.h>
  54
  55 #ifndef CONFIG_BT_RFCOMM_DEBUG
  56 #undef  BT_DBG
  57 #define BT_DBG(D...)
  58 #endif
  59
  60 static const struct proto_ops rfcomm_sock_ops;
  61
  62 static struct bt_sock_list rfcomm_sk_list = {
  63         .lock = RW_LOCK_UNLOCKED
  64 };
  65
  66 static void rfcomm_sock_close(struct sock *sk);
  67 static void rfcomm_sock_kill(struct sock *sk);
  68
  69 /* ---- DLC callbacks ----
  70  *
  71  * called under rfcomm_dlc_lock()
  72  */
  73 static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb)
  74 {
  75         struct sock *sk = d->owner;
  76         if (!sk)
  77                 return;
  78
  79         atomic_add(skb->len, &sk->sk_rmem_alloc);
  80         skb_queue_tail(&sk->sk_receive_queue, skb);
  81         sk->sk_data_ready(sk, skb->len);
  82
  83         if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
  84                 rfcomm_dlc_throttle(d);
  85 }
  86
  87 static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err)
  88 {
  89         struct sock *sk = d->owner, *parent;
  90         if (!sk)
  91                 return;
  92
  93         BT_DBG("dlc %p state %ld err %d", d, d->state, err);
  94
  95         bh_lock_sock(sk);
  96
  97         if (err)
  98                 sk->sk_err = err;
  99
 100         sk->sk_state = d->state;
 101
 102         parent = bt_sk(sk)->parent;
 103         if (parent) {
 104                 if (d->state == BT_CLOSED) {
 105                         sock_set_flag(sk, SOCK_ZAPPED);
 106                         bt_accept_unlink(sk);
 107                 }
 108                 parent->sk_data_ready(parent, 0);
 109         } else {
 110                 if (d->state == BT_CONNECTED)
 111                         rfcomm_session_getaddr(d->session, &bt_sk(sk)->src, NULL);
 112                 sk->sk_state_change(sk);
 113         }
 114
 115         bh_unlock_sock(sk);
 116
 117         if (parent && sock_flag(sk, SOCK_ZAPPED)) {
 118                 /* We have to drop DLC lock here, otherwise
 119                  * rfcomm_sock_destruct() will dead lock. */
 120                 rfcomm_dlc_unlock(d);
 121                 rfcomm_sock_kill(sk);
 122                 rfcomm_dlc_lock(d);
 123         }
 124 }
 125
 126 /* ---- Socket functions ---- */
 127 static struct sock *__rfcomm_get_sock_by_addr(u8 channel, bdaddr_t *src)
 128 {
 129         struct sock *sk = NULL;
 130         struct hlist_node *node;
 131
 132         sk_for_each(sk, node, &rfcomm_sk_list.head) {
 133                 if (rfcomm_pi(sk)->channel == channel &&
 134                                 !bacmp(&bt_sk(sk)->src, src))
 135                         break;
 136         }
 137
 138         return node ? sk : NULL;
 139 }
 140
 141 /* Find socket with channel and source bdaddr.
 142  * Returns closest match.
 143  */
 144 static struct sock *__rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src)
 145 {
 146         struct sock *sk = NULL, *sk1 = NULL;
 147         struct hlist_node *node;
 148
 149         sk_for_each(sk, node, &rfcomm_sk_list.head) {
 150                 if (state && sk->sk_state != state)
 151                         continue;
 152
 153                 if (rfcomm_pi(sk)->channel == channel) {
 154                         /* Exact match. */
 155                         if (!bacmp(&bt_sk(sk)->src, src))
 156                                 break;
 157
 158                         /* Closest match */
 159                         if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
 160                                 sk1 = sk;
 161                 }
 162         }
 163         return node ? sk : sk1;
 164 }
 165
 166 /* Find socket with given address (channel, src).
 167  * Returns locked socket */
 168 static inline struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src)
 169 {
 170         struct sock *s;
 171         read_lock(&rfcomm_sk_list.lock);
 172         s = __rfcomm_get_sock_by_channel(state, channel, src);
 173         if (s) bh_lock_sock(s);
 174         read_unlock(&rfcomm_sk_list.lock);
 175         return s;
 176 }
 177
 178 static void rfcomm_sock_destruct(struct sock *sk)
 179 {
 180         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 181
 182         BT_DBG("sk %p dlc %p", sk, d);
 183
 184         skb_queue_purge(&sk->sk_receive_queue);
 185         skb_queue_purge(&sk->sk_write_queue);
 186
 187         rfcomm_dlc_lock(d);
 188         rfcomm_pi(sk)->dlc = NULL;
 189
 190         /* Detach DLC if it's owned by this socket */
 191         if (d->owner == sk)
 192                 d->owner = NULL;
 193         rfcomm_dlc_unlock(d);
 194
 195         rfcomm_dlc_put(d);
 196 }
 197
 198 static void rfcomm_sock_cleanup_listen(struct sock *parent)
 199 {
 200         struct sock *sk;
 201
 202         BT_DBG("parent %p", parent);
 203
 204         /* Close not yet accepted dlcs */
 205         while ((sk = bt_accept_dequeue(parent, NULL))) {
 206                 rfcomm_sock_close(sk);
 207                 rfcomm_sock_kill(sk);
 208         }
 209
 210         parent->sk_state  = BT_CLOSED;
 211         sock_set_flag(parent, SOCK_ZAPPED);
 212 }
 213
 214 /* Kill socket (only if zapped and orphan)
 215  * Must be called on unlocked socket.
 216  */
 217 static void rfcomm_sock_kill(struct sock *sk)
 218 {
 219         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 220                 return;
 221
 222         BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 223
 224         /* Kill poor orphan */
 225         bt_sock_unlink(&rfcomm_sk_list, sk);
 226         sock_set_flag(sk, SOCK_DEAD);
 227         sock_put(sk);
 228 }
 229
 230 static void __rfcomm_sock_close(struct sock *sk)
 231 {
 232         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 233
 234         BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
 235
 236         switch (sk->sk_state) {
 237         case BT_LISTEN:
 238                 rfcomm_sock_cleanup_listen(sk);
 239                 break;
 240
 241         case BT_CONNECT:
 242         case BT_CONNECT2:
 243         case BT_CONFIG:
 244         case BT_CONNECTED:
 245                 rfcomm_dlc_close(d, 0);
 246
 247         default:
 248                 sock_set_flag(sk, SOCK_ZAPPED);
 249                 break;
 250         }
 251 }
 252
 253 /* Close socket.
 254  * Must be called on unlocked socket.
 255  */
 256 static void rfcomm_sock_close(struct sock *sk)
 257 {
 258         lock_sock(sk);
 259         __rfcomm_sock_close(sk);
 260         release_sock(sk);
 261 }
 262
 263 static void rfcomm_sock_init(struct sock *sk, struct sock *parent)
 264 {
 265         struct rfcomm_pinfo *pi = rfcomm_pi(sk);
 266
 267         BT_DBG("sk %p", sk);
 268
 269         if (parent) {
 270                 sk->sk_type = parent->sk_type;
 271                 pi->link_mode = rfcomm_pi(parent)->link_mode;
 272         } else {
 273                 pi->link_mode = 0;
 274         }
 275
 276         pi->dlc->link_mode = pi->link_mode;
 277 }
 278
 279 static struct proto rfcomm_proto = {
 280         .name           = "RFCOMM",
 281         .owner          = THIS_MODULE,
 282         .obj_size       = sizeof(struct rfcomm_pinfo)
 283 };
 284
 285 static struct sock *rfcomm_sock_alloc(struct socket *sock, int proto, gfp_t prio)
 286 {
 287         struct rfcomm_dlc *d;
 288         struct sock *sk;
 289
 290         sk = sk_alloc(PF_BLUETOOTH, prio, &rfcomm_proto, 1);
 291         if (!sk)
 292                 return NULL;
 293
 294         sock_init_data(sock, sk);
 295         INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
 296
 297         d = rfcomm_dlc_alloc(prio);
 298         if (!d) {
 299                 sk_free(sk);
 300                 return NULL;
 301         }
 302
 303         d->data_ready   = rfcomm_sk_data_ready;
 304         d->state_change = rfcomm_sk_state_change;
 305
 306         rfcomm_pi(sk)->dlc = d;
 307         d->owner = sk;
 308
 309         sk->sk_destruct = rfcomm_sock_destruct;
 310         sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT;
 311
 312         sk->sk_sndbuf   = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
 313         sk->sk_rcvbuf   = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
 314
 315         sock_reset_flag(sk, SOCK_ZAPPED);
 316
 317         sk->sk_protocol = proto;
 318         sk->sk_state    = BT_OPEN;
 319
 320         bt_sock_link(&rfcomm_sk_list, sk);
 321
 322         BT_DBG("sk %p", sk);
 323         return sk;
 324 }
 325
 326 static int rfcomm_sock_create(struct socket *sock, int protocol)
 327 {
 328         struct sock *sk;
 329
 330         BT_DBG("sock %p", sock);
 331
 332         sock->state = SS_UNCONNECTED;
 333
 334         if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW)
 335                 return -ESOCKTNOSUPPORT;
 336
 337         sock->ops = &rfcomm_sock_ops;
 338
 339         sk = rfcomm_sock_alloc(sock, protocol, GFP_ATOMIC);
 340         if (!sk)
 341                 return -ENOMEM;
 342
 343         rfcomm_sock_init(sk, NULL);
 344         return 0;
 345 }
 346
 347 static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 348 {
 349         struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
 350         struct sock *sk = sock->sk;
 351         int err = 0;
 352
 353         BT_DBG("sk %p %s", sk, batostr(&sa->rc_bdaddr));
 354
 355         if (!addr || addr->sa_family != AF_BLUETOOTH)
 356                 return -EINVAL;
 357
 358         lock_sock(sk);
 359
 360         if (sk->sk_state != BT_OPEN) {
 361                 err = -EBADFD;
 362                 goto done;
 363         }
 364
 365         if (sk->sk_type != SOCK_STREAM) {
 366                 err = -EINVAL;
 367                 goto done;
 368         }
 369
 370         write_lock_bh(&rfcomm_sk_list.lock);
 371
 372         if (sa->rc_channel && __rfcomm_get_sock_by_addr(sa->rc_channel, &sa->rc_bdaddr)) {
 373                 err = -EADDRINUSE;
 374         } else {
 375                 /* Save source address */
 376                 bacpy(&bt_sk(sk)->src, &sa->rc_bdaddr);
 377                 rfcomm_pi(sk)->channel = sa->rc_channel;
 378                 sk->sk_state = BT_BOUND;
 379         }
 380
 381         write_unlock_bh(&rfcomm_sk_list.lock);
 382
 383 done:
 384         release_sock(sk);
 385         return err;
 386 }
 387
 388 static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
 389 {
 390         struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
 391         struct sock *sk = sock->sk;
 392         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 393         int err = 0;
 394
 395         BT_DBG("sk %p", sk);
 396
 397         if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_rc))
 398                 return -EINVAL;
 399
 400         lock_sock(sk);
 401
 402         if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) {
 403                 err = -EBADFD;
 404                 goto done;
 405         }
 406
 407         if (sk->sk_type != SOCK_STREAM) {
 408                 err = -EINVAL;
 409                 goto done;
 410         }
 411
 412         sk->sk_state = BT_CONNECT;
 413         bacpy(&bt_sk(sk)->dst, &sa->rc_bdaddr);
 414         rfcomm_pi(sk)->channel = sa->rc_channel;
 415
 416         err = rfcomm_dlc_open(d, &bt_sk(sk)->src, &sa->rc_bdaddr, sa->rc_channel);
 417         if (!err)
 418                 err = bt_sock_wait_state(sk, BT_CONNECTED,
 419                                 sock_sndtimeo(sk, flags & O_NONBLOCK));
 420
 421 done:
 422         release_sock(sk);
 423         return err;
 424 }
 425
 426 static int rfcomm_sock_listen(struct socket *sock, int backlog)
 427 {
 428         struct sock *sk = sock->sk;
 429         int err = 0;
 430
 431         BT_DBG("sk %p backlog %d", sk, backlog);
 432
 433         lock_sock(sk);
 434
 435         if (sk->sk_state != BT_BOUND) {
 436                 err = -EBADFD;
 437                 goto done;
 438         }
 439
 440         if (sk->sk_type != SOCK_STREAM) {
 441                 err = -EINVAL;
 442                 goto done;
 443         }
 444
 445         if (!rfcomm_pi(sk)->channel) {
 446                 bdaddr_t *src = &bt_sk(sk)->src;
 447                 u8 channel;
 448
 449                 err = -EINVAL;
 450
 451                 write_lock_bh(&rfcomm_sk_list.lock);
 452
 453                 for (channel = 1; channel < 31; channel++)
 454                         if (!__rfcomm_get_sock_by_addr(channel, src)) {
 455                                 rfcomm_pi(sk)->channel = channel;
 456                                 err = 0;
 457                                 break;
 458                         }
 459
 460                 write_unlock_bh(&rfcomm_sk_list.lock);
 461
 462                 if (err < 0)
 463                         goto done;
 464         }
 465
 466         sk->sk_max_ack_backlog = backlog;
 467         sk->sk_ack_backlog = 0;
 468         sk->sk_state = BT_LISTEN;
 469
 470 done:
 471         release_sock(sk);
 472         return err;
 473 }
 474
 475 static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags)
 476 {
 477         DECLARE_WAITQUEUE(wait, current);
 478         struct sock *sk = sock->sk, *nsk;
 479         long timeo;
 480         int err = 0;
 481
 482         lock_sock(sk);
 483
 484         if (sk->sk_state != BT_LISTEN) {
 485                 err = -EBADFD;
 486                 goto done;
 487         }
 488
 489         if (sk->sk_type != SOCK_STREAM) {
 490                 err = -EINVAL;
 491                 goto done;
 492         }
 493
 494         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 495
 496         BT_DBG("sk %p timeo %ld", sk, timeo);
 497
 498         /* Wait for an incoming connection. (wake-one). */
 499         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 500         while (!(nsk = bt_accept_dequeue(sk, newsock))) {
 501                 set_current_state(TASK_INTERRUPTIBLE);
 502                 if (!timeo) {
 503                         err = -EAGAIN;
 504                         break;
 505                 }
 506
 507                 release_sock(sk);
 508                 timeo = schedule_timeout(timeo);
 509                 lock_sock(sk);
 510
 511                 if (sk->sk_state != BT_LISTEN) {
 512                         err = -EBADFD;
 513                         break;
 514                 }
 515
 516                 if (signal_pending(current)) {
 517                         err = sock_intr_errno(timeo);
 518                         break;
 519                 }
 520         }
 521         set_current_state(TASK_RUNNING);
 522         remove_wait_queue(sk->sk_sleep, &wait);
 523
 524         if (err)
 525                 goto done;
 526
 527         newsock->state = SS_CONNECTED;
 528
 529         BT_DBG("new socket %p", nsk);
 530
 531 done:
 532         release_sock(sk);
 533         return err;
 534 }
 535
 536 static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
 537 {
 538         struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
 539         struct sock *sk = sock->sk;
 540
 541         BT_DBG("sock %p, sk %p", sock, sk);
 542
 543         sa->rc_family  = AF_BLUETOOTH;
 544         sa->rc_channel = rfcomm_pi(sk)->channel;
 545         if (peer)
 546                 bacpy(&sa->rc_bdaddr, &bt_sk(sk)->dst);
 547         else
 548                 bacpy(&sa->rc_bdaddr, &bt_sk(sk)->src);
 549
 550         *len = sizeof(struct sockaddr_rc);
 551         return 0;
 552 }
 553
 554 static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 555                                struct msghdr *msg, size_t len)
 556 {
 557         struct sock *sk = sock->sk;
 558         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 559         struct sk_buff *skb;
 560         int err;
 561         int sent = 0;
 562
 563         if (msg->msg_flags & MSG_OOB)
 564                 return -EOPNOTSUPP;
 565
 566         if (sk->sk_shutdown & SEND_SHUTDOWN)
 567                 return -EPIPE;
 568
 569         BT_DBG("sock %p, sk %p", sock, sk);
 570
 571         lock_sock(sk);
 572
 573         while (len) {
 574                 size_t size = min_t(size_t, len, d->mtu);
 575
 576                 skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE,
 577                                 msg->msg_flags & MSG_DONTWAIT, &err);
 578                 if (!skb)
 579                         break;
 580                 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
 581
 582                 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
 583                 if (err) {
 584                         kfree_skb(skb);
 585                         sent = err;
 586                         break;
 587                 }
 588
 589                 err = rfcomm_dlc_send(d, skb);
 590                 if (err < 0) {
 591                         kfree_skb(skb);
 592                         break;
 593                 }
 594
 595                 sent += size;
 596                 len  -= size;
 597         }
 598
 599         release_sock(sk);
 600
 601         return sent ? sent : err;
 602 }
 603
 604 static long rfcomm_sock_data_wait(struct sock *sk, long timeo)
 605 {
 606         DECLARE_WAITQUEUE(wait, current);
 607
 608         add_wait_queue(sk->sk_sleep, &wait);
 609         for (;;) {
 610                 set_current_state(TASK_INTERRUPTIBLE);
 611
 612                 if (!skb_queue_empty(&sk->sk_receive_queue) ||
 613                     sk->sk_err ||
 614                     (sk->sk_shutdown & RCV_SHUTDOWN) ||
 615                     signal_pending(current) ||
 616                     !timeo)
 617                         break;
 618
 619                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 620                 release_sock(sk);
 621                 timeo = schedule_timeout(timeo);
 622                 lock_sock(sk);
 623                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 624         }
 625
 626         __set_current_state(TASK_RUNNING);
 627         remove_wait_queue(sk->sk_sleep, &wait);
 628         return timeo;
 629 }
 630
 631 static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 632                                struct msghdr *msg, size_t size, int flags)
 633 {
 634         struct sock *sk = sock->sk;
 635         int err = 0;
 636         size_t target, copied = 0;
 637         long timeo;
 638
 639         if (flags & MSG_OOB)
 640                 return -EOPNOTSUPP;
 641
 642         msg->msg_namelen = 0;
 643
 644         BT_DBG("sk %p size %d", sk, size);
 645
 646         lock_sock(sk);
 647
 648         target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
 649         timeo  = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
 650
 651         do {
 652                 struct sk_buff *skb;
 653                 int chunk;
 654
 655                 skb = skb_dequeue(&sk->sk_receive_queue);
 656                 if (!skb) {
 657                         if (copied >= target)
 658                                 break;
 659
 660                         if ((err = sock_error(sk)) != 0)
 661                                 break;
 662                         if (sk->sk_shutdown & RCV_SHUTDOWN)
 663                                 break;
 664
 665                         err = -EAGAIN;
 666                         if (!timeo)
 667                                 break;
 668
 669                         timeo = rfcomm_sock_data_wait(sk, timeo);
 670
 671                         if (signal_pending(current)) {
 672                                 err = sock_intr_errno(timeo);
 673                                 goto out;
 674                         }
 675                         continue;
 676                 }
 677
 678                 chunk = min_t(unsigned int, skb->len, size);
 679                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
 680                         skb_queue_head(&sk->sk_receive_queue, skb);
 681                         if (!copied)
 682                                 copied = -EFAULT;
 683                         break;
 684                 }
 685                 copied += chunk;
 686                 size   -= chunk;
 687
 688                 if (!(flags & MSG_PEEK)) {
 689                         atomic_sub(chunk, &sk->sk_rmem_alloc);
 690
 691                         skb_pull(skb, chunk);
 692                         if (skb->len) {
 693                                 skb_queue_head(&sk->sk_receive_queue, skb);
 694                                 break;
 695                         }
 696                         kfree_skb(skb);
 697
 698                 } else {
 699                         /* put message back and return */
 700                         skb_queue_head(&sk->sk_receive_queue, skb);
 701                         break;
 702                 }
 703         } while (size);
 704
 705 out:
 706         if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2))
 707                 rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc);
 708
 709         release_sock(sk);
 710         return copied ? : err;
 711 }
 712
 713 static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
 714 {
 715         struct sock *sk = sock->sk;
 716         int err = 0;
 717         u32 opt;
 718
 719         BT_DBG("sk %p", sk);
 720
 721         lock_sock(sk);
 722
 723         switch (optname) {
 724         case RFCOMM_LM:
 725                 if (get_user(opt, (u32 __user *) optval)) {
 726                         err = -EFAULT;
 727                         break;
 728                 }
 729
 730                 rfcomm_pi(sk)->link_mode = opt;
 731                 break;
 732
 733         default:
 734                 err = -ENOPROTOOPT;
 735                 break;
 736         }
 737
 738         release_sock(sk);
 739         return err;
 740 }
 741
 742 static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
 743 {
 744         struct sock *sk = sock->sk;
 745         struct sock *l2cap_sk;
 746         struct rfcomm_conninfo cinfo;
 747         int len, err = 0;
 748
 749         BT_DBG("sk %p", sk);
 750
 751         if (get_user(len, optlen))
 752                 return -EFAULT;
 753
 754         lock_sock(sk);
 755
 756         switch (optname) {
 757         case RFCOMM_LM:
 758                 if (put_user(rfcomm_pi(sk)->link_mode, (u32 __user *) optval))
 759                         err = -EFAULT;
 760                 break;
 761
 762         case RFCOMM_CONNINFO:
 763                 if (sk->sk_state != BT_CONNECTED) {
 764                         err = -ENOTCONN;
 765                         break;
 766                 }
 767
 768                 l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk;
 769
 770                 cinfo.hci_handle = l2cap_pi(l2cap_sk)->conn->hcon->handle;
 771                 memcpy(cinfo.dev_class, l2cap_pi(l2cap_sk)->conn->hcon->dev_class, 3);
 772
 773                 len = min_t(unsigned int, len, sizeof(cinfo));
 774                 if (copy_to_user(optval, (char *) &cinfo, len))
 775                         err = -EFAULT;
 776
 777                 break;
 778
 779         default:
 780                 err = -ENOPROTOOPT;
 781                 break;
 782         }
 783
 784         release_sock(sk);
 785         return err;
 786 }
 787
 788 static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 789 {
 790         struct sock *sk = sock->sk;
 791         int err;
 792
 793         lock_sock(sk);
 794
 795 #ifdef CONFIG_BT_RFCOMM_TTY
 796         err = rfcomm_dev_ioctl(sk, cmd, (void __user *)arg);
 797 #else
 798         err = -EOPNOTSUPP;
 799 #endif
 800
 801         release_sock(sk);
 802         return err;
 803 }
 804
 805 static int rfcomm_sock_shutdown(struct socket *sock, int how)
 806 {
 807         struct sock *sk = sock->sk;
 808         int err = 0;
 809
 810         BT_DBG("sock %p, sk %p", sock, sk);
 811
 812         if (!sk) return 0;
 813
 814         lock_sock(sk);
 815         if (!sk->sk_shutdown) {
 816                 sk->sk_shutdown = SHUTDOWN_MASK;
 817                 __rfcomm_sock_close(sk);
 818
 819                 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 820                         err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
 821         }
 822         release_sock(sk);
 823         return err;
 824 }
 825
 826 static int rfcomm_sock_release(struct socket *sock)
 827 {
 828         struct sock *sk = sock->sk;
 829         int err;
 830
 831         BT_DBG("sock %p, sk %p", sock, sk);
 832
 833         if (!sk)
 834                 return 0;
 835
 836         err = rfcomm_sock_shutdown(sock, 2);
 837
 838         sock_orphan(sk);
 839         rfcomm_sock_kill(sk);
 840         return err;
 841 }
 842
 843 /* ---- RFCOMM core layer callbacks ----
 844  *
 845  * called under rfcomm_lock()
 846  */
 847 int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d)
 848 {
 849         struct sock *sk, *parent;
 850         bdaddr_t src, dst;
 851         int result = 0;
 852
 853         BT_DBG("session %p channel %d", s, channel);
 854
 855         rfcomm_session_getaddr(s, &src, &dst);
 856
 857         /* Check if we have socket listening on channel */
 858         parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src);
 859         if (!parent)
 860                 return 0;
 861
 862         /* Check for backlog size */
 863         if (sk_acceptq_is_full(parent)) {
 864                 BT_DBG("backlog full %d", parent->sk_ack_backlog);
 865                 goto done;
 866         }
 867
 868         sk = rfcomm_sock_alloc(NULL, BTPROTO_RFCOMM, GFP_ATOMIC);
 869         if (!sk)
 870                 goto done;
 871
 872         rfcomm_sock_init(sk, parent);
 873         bacpy(&bt_sk(sk)->src, &src);
 874         bacpy(&bt_sk(sk)->dst, &dst);
 875         rfcomm_pi(sk)->channel = channel;
 876
 877         sk->sk_state = BT_CONFIG;
 878         bt_accept_enqueue(parent, sk);
 879
 880         /* Accept connection and return socket DLC */
 881         *d = rfcomm_pi(sk)->dlc;
 882         result = 1;
 883
 884 done:
 885         bh_unlock_sock(parent);
 886         return result;
 887 }
 888
 889 static ssize_t rfcomm_sock_sysfs_show(struct class *dev, char *buf)
 890 {
 891         struct sock *sk;
 892         struct hlist_node *node;
 893         char *str = buf;
 894
 895         read_lock_bh(&rfcomm_sk_list.lock);
 896
 897         sk_for_each(sk, node, &rfcomm_sk_list.head) {
 898                 str += sprintf(str, "%s %s %d %d\n",
 899                                 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
 900                                 sk->sk_state, rfcomm_pi(sk)->channel);
 901         }
 902
 903         read_unlock_bh(&rfcomm_sk_list.lock);
 904
 905         return (str - buf);
 906 }
 907
 908 static CLASS_ATTR(rfcomm, S_IRUGO, rfcomm_sock_sysfs_show, NULL);
 909
 910 static const struct proto_ops rfcomm_sock_ops = {
 911         .family         = PF_BLUETOOTH,
 912         .owner          = THIS_MODULE,
 913         .release        = rfcomm_sock_release,
 914         .bind           = rfcomm_sock_bind,
 915         .connect        = rfcomm_sock_connect,
 916         .listen         = rfcomm_sock_listen,
 917         .accept         = rfcomm_sock_accept,
 918         .getname        = rfcomm_sock_getname,
 919         .sendmsg        = rfcomm_sock_sendmsg,
 920         .recvmsg        = rfcomm_sock_recvmsg,
 921         .shutdown       = rfcomm_sock_shutdown,
 922         .setsockopt     = rfcomm_sock_setsockopt,
 923         .getsockopt     = rfcomm_sock_getsockopt,
 924         .ioctl          = rfcomm_sock_ioctl,
 925         .poll           = bt_sock_poll,
 926         .socketpair     = sock_no_socketpair,
 927         .mmap           = sock_no_mmap
 928 };
 929
 930 static struct net_proto_family rfcomm_sock_family_ops = {
 931         .family         = PF_BLUETOOTH,
 932         .owner          = THIS_MODULE,
 933         .create         = rfcomm_sock_create
 934 };
 935
 936 int __init rfcomm_init_sockets(void)
 937 {
 938         int err;
 939
 940         err = proto_register(&rfcomm_proto, 0);
 941         if (err < 0)
 942                 return err;
 943
 944         err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops);
 945         if (err < 0)
 946                 goto error;
 947
 948         if (class_create_file(bt_class, &class_attr_rfcomm) < 0)
 949                 BT_ERR("Failed to create RFCOMM info file");
 950
 951         BT_INFO("RFCOMM socket layer initialized");
 952
 953         return 0;
 954
 955 error:
 956         BT_ERR("RFCOMM socket layer registration failed");
 957         proto_unregister(&rfcomm_proto);
 958         return err;
 959 }
 960
 961 void __exit rfcomm_cleanup_sockets(void)
 962 {
 963         class_remove_file(bt_class, &class_attr_rfcomm);
 964
 965         if (bt_sock_unregister(BTPROTO_RFCOMM) < 0)
 966                 BT_ERR("RFCOMM socket layer unregistration failed");
 967
 968         proto_unregister(&rfcomm_proto);
 969 }