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/config.h>
  31 #include <linux/module.h>
  32
  33 #include <linux/types.h>
  34 #include <linux/errno.h>
  35 #include <linux/kernel.h>
  36 #include <linux/sched.h>
  37 #include <linux/slab.h>
  38 #include <linux/poll.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/init.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/socket.h>
  43 #include <linux/skbuff.h>
  44 #include <linux/list.h>
  45 #include <linux/device.h>
  46 #include <net/sock.h>
  47
  48 #include <asm/system.h>
  49 #include <asm/uaccess.h>
  50
  51 #include <net/bluetooth/bluetooth.h>
  52 #include <net/bluetooth/hci_core.h>
  53 #include <net/bluetooth/l2cap.h>
  54 #include <net/bluetooth/rfcomm.h>
  55
  56 #ifndef CONFIG_BT_RFCOMM_DEBUG
  57 #undef  BT_DBG
  58 #define BT_DBG(D...)
  59 #endif
  60
  61 static const struct proto_ops rfcomm_sock_ops;
  62
  63 static struct bt_sock_list rfcomm_sk_list = {
  64         .lock = RW_LOCK_UNLOCKED
  65 };
  66
  67 static void rfcomm_sock_close(struct sock *sk);
  68 static void rfcomm_sock_kill(struct sock *sk);
  69
  70 /* ---- DLC callbacks ----
  71  *
  72  * called under rfcomm_dlc_lock()
  73  */
  74 static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb)
  75 {
  76         struct sock *sk = d->owner;
  77         if (!sk)
  78                 return;
  79
  80         atomic_add(skb->len, &sk->sk_rmem_alloc);
  81         skb_queue_tail(&sk->sk_receive_queue, skb);
  82         sk->sk_data_ready(sk, skb->len);
  83
  84         if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
  85                 rfcomm_dlc_throttle(d);
  86 }
  87
  88 static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err)
  89 {
  90         struct sock *sk = d->owner, *parent;
  91         if (!sk)
  92                 return;
  93
  94         BT_DBG("dlc %p state %ld err %d", d, d->state, err);
  95
  96         bh_lock_sock(sk);
  97
  98         if (err)
  99                 sk->sk_err = err;
 100
 101         sk->sk_state = d->state;
 102
 103         parent = bt_sk(sk)->parent;
 104         if (parent) {
 105                 if (d->state == BT_CLOSED) {
 106                         sock_set_flag(sk, SOCK_ZAPPED);
 107                         bt_accept_unlink(sk);
 108                 }
 109                 parent->sk_data_ready(parent, 0);
 110         } else {
 111                 if (d->state == BT_CONNECTED)
 112                         rfcomm_session_getaddr(d->session, &bt_sk(sk)->src, NULL);
 113                 sk->sk_state_change(sk);
 114         }
 115
 116         bh_unlock_sock(sk);
 117
 118         if (parent && sock_flag(sk, SOCK_ZAPPED)) {
 119                 /* We have to drop DLC lock here, otherwise
 120                  * rfcomm_sock_destruct() will dead lock. */
 121                 rfcomm_dlc_unlock(d);
 122                 rfcomm_sock_kill(sk);
 123                 rfcomm_dlc_lock(d);
 124         }
 125 }
 126
 127 /* ---- Socket functions ---- */
 128 static struct sock *__rfcomm_get_sock_by_addr(u8 channel, bdaddr_t *src)
 129 {
 130         struct sock *sk = NULL;
 131         struct hlist_node *node;
 132
 133         sk_for_each(sk, node, &rfcomm_sk_list.head) {
 134                 if (rfcomm_pi(sk)->channel == channel &&
 135                                 !bacmp(&bt_sk(sk)->src, src))
 136                         break;
 137         }
 138
 139         return node ? sk : NULL;
 140 }
 141
 142 /* Find socket with channel and source bdaddr.
 143  * Returns closest match.
 144  */
 145 static struct sock *__rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src)
 146 {
 147         struct sock *sk = NULL, *sk1 = NULL;
 148         struct hlist_node *node;
 149
 150         sk_for_each(sk, node, &rfcomm_sk_list.head) {
 151                 if (state && sk->sk_state != state)
 152                         continue;
 153
 154                 if (rfcomm_pi(sk)->channel == channel) {
 155                         /* Exact match. */
 156                         if (!bacmp(&bt_sk(sk)->src, src))
 157                                 break;
 158
 159                         /* Closest match */
 160                         if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
 161                                 sk1 = sk;
 162                 }
 163         }
 164         return node ? sk : sk1;
 165 }
 166
 167 /* Find socket with given address (channel, src).
 168  * Returns locked socket */
 169 static inline struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src)
 170 {
 171         struct sock *s;
 172         read_lock(&rfcomm_sk_list.lock);
 173         s = __rfcomm_get_sock_by_channel(state, channel, src);
 174         if (s) bh_lock_sock(s);
 175         read_unlock(&rfcomm_sk_list.lock);
 176         return s;
 177 }
 178
 179 static void rfcomm_sock_destruct(struct sock *sk)
 180 {
 181         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 182
 183         BT_DBG("sk %p dlc %p", sk, d);
 184
 185         skb_queue_purge(&sk->sk_receive_queue);
 186         skb_queue_purge(&sk->sk_write_queue);
 187
 188         rfcomm_dlc_lock(d);
 189         rfcomm_pi(sk)->dlc = NULL;
 190
 191         /* Detach DLC if it's owned by this socket */
 192         if (d->owner == sk)
 193                 d->owner = NULL;
 194         rfcomm_dlc_unlock(d);
 195
 196         rfcomm_dlc_put(d);
 197 }
 198
 199 static void rfcomm_sock_cleanup_listen(struct sock *parent)
 200 {
 201         struct sock *sk;
 202
 203         BT_DBG("parent %p", parent);
 204
 205         /* Close not yet accepted dlcs */
 206         while ((sk = bt_accept_dequeue(parent, NULL))) {
 207                 rfcomm_sock_close(sk);
 208                 rfcomm_sock_kill(sk);
 209         }
 210
 211         parent->sk_state  = BT_CLOSED;
 212         sock_set_flag(parent, SOCK_ZAPPED);
 213 }
 214
 215 /* Kill socket (only if zapped and orphan)
 216  * Must be called on unlocked socket.
 217  */
 218 static void rfcomm_sock_kill(struct sock *sk)
 219 {
 220         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 221                 return;
 222
 223         BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 224
 225         /* Kill poor orphan */
 226         bt_sock_unlink(&rfcomm_sk_list, sk);
 227         sock_set_flag(sk, SOCK_DEAD);
 228         sock_put(sk);
 229 }
 230
 231 static void __rfcomm_sock_close(struct sock *sk)
 232 {
 233         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 234
 235         BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
 236
 237         switch (sk->sk_state) {
 238         case BT_LISTEN:
 239                 rfcomm_sock_cleanup_listen(sk);
 240                 break;
 241
 242         case BT_CONNECT:
 243         case BT_CONNECT2:
 244         case BT_CONFIG:
 245         case BT_CONNECTED:
 246                 rfcomm_dlc_close(d, 0);
 247
 248         default:
 249                 sock_set_flag(sk, SOCK_ZAPPED);
 250                 break;
 251         }
 252 }
 253
 254 /* Close socket.
 255  * Must be called on unlocked socket.
 256  */
 257 static void rfcomm_sock_close(struct sock *sk)
 258 {
 259         lock_sock(sk);
 260         __rfcomm_sock_close(sk);
 261         release_sock(sk);
 262 }
 263
 264 static void rfcomm_sock_init(struct sock *sk, struct sock *parent)
 265 {
 266         struct rfcomm_pinfo *pi = rfcomm_pi(sk);
 267
 268         BT_DBG("sk %p", sk);
 269
 270         if (parent) {
 271                 sk->sk_type = parent->sk_type;
 272                 pi->link_mode = rfcomm_pi(parent)->link_mode;
 273         } else {
 274                 pi->link_mode = 0;
 275         }
 276
 277         pi->dlc->link_mode = pi->link_mode;
 278 }
 279
 280 static struct proto rfcomm_proto = {
 281         .name           = "RFCOMM",
 282         .owner          = THIS_MODULE,
 283         .obj_size       = sizeof(struct rfcomm_pinfo)
 284 };
 285
 286 static struct sock *rfcomm_sock_alloc(struct socket *sock, int proto, gfp_t prio)
 287 {
 288         struct rfcomm_dlc *d;
 289         struct sock *sk;
 290
 291         sk = sk_alloc(PF_BLUETOOTH, prio, &rfcomm_proto, 1);
 292         if (!sk)
 293                 return NULL;
 294
 295         sock_init_data(sock, sk);
 296         INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
 297
 298         d = rfcomm_dlc_alloc(prio);
 299         if (!d) {
 300                 sk_free(sk);
 301                 return NULL;
 302         }
 303
 304         d->data_ready   = rfcomm_sk_data_ready;
 305         d->state_change = rfcomm_sk_state_change;
 306
 307         rfcomm_pi(sk)->dlc = d;
 308         d->owner = sk;
 309
 310         sk->sk_destruct = rfcomm_sock_destruct;
 311         sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT;
 312
 313         sk->sk_sndbuf   = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
 314         sk->sk_rcvbuf   = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
 315
 316         sock_reset_flag(sk, SOCK_ZAPPED);
 317
 318         sk->sk_protocol = proto;
 319         sk->sk_state    = BT_OPEN;
 320
 321         bt_sock_link(&rfcomm_sk_list, sk);
 322
 323         BT_DBG("sk %p", sk);
 324         return sk;
 325 }
 326
 327 static int rfcomm_sock_create(struct socket *sock, int protocol)
 328 {
 329         struct sock *sk;
 330
 331         BT_DBG("sock %p", sock);
 332
 333         sock->state = SS_UNCONNECTED;
 334
 335         if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW)
 336                 return -ESOCKTNOSUPPORT;
 337
 338         sock->ops = &rfcomm_sock_ops;
 339
 340         if (!(sk = rfcomm_sock_alloc(sock, protocol, GFP_KERNEL)))
 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 sent = 0;
 561
 562         if (msg->msg_flags & MSG_OOB)
 563                 return -EOPNOTSUPP;
 564
 565         if (sk->sk_shutdown & SEND_SHUTDOWN)
 566                 return -EPIPE;
 567
 568         BT_DBG("sock %p, sk %p", sock, sk);
 569
 570         lock_sock(sk);
 571
 572         while (len) {
 573                 size_t size = min_t(size_t, len, d->mtu);
 574                 int err;
 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                         if (sent == 0)
 586                                 sent = err;
 587                         break;
 588                 }
 589
 590                 err = rfcomm_dlc_send(d, skb);
 591                 if (err < 0) {
 592                         kfree_skb(skb);
 593                         if (sent == 0)
 594                                 sent = err;
 595                         break;
 596                 }
 597
 598                 sent += size;
 599                 len  -= size;
 600         }
 601
 602         release_sock(sk);
 603
 604         return sent;
 605 }
 606
 607 static long rfcomm_sock_data_wait(struct sock *sk, long timeo)
 608 {
 609         DECLARE_WAITQUEUE(wait, current);
 610
 611         add_wait_queue(sk->sk_sleep, &wait);
 612         for (;;) {
 613                 set_current_state(TASK_INTERRUPTIBLE);
 614
 615                 if (!skb_queue_empty(&sk->sk_receive_queue) ||
 616                     sk->sk_err ||
 617                     (sk->sk_shutdown & RCV_SHUTDOWN) ||
 618                     signal_pending(current) ||
 619                     !timeo)
 620                         break;
 621
 622                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 623                 release_sock(sk);
 624                 timeo = schedule_timeout(timeo);
 625                 lock_sock(sk);
 626                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 627         }
 628
 629         __set_current_state(TASK_RUNNING);
 630         remove_wait_queue(sk->sk_sleep, &wait);
 631         return timeo;
 632 }
 633
 634 static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 635                                struct msghdr *msg, size_t size, int flags)
 636 {
 637         struct sock *sk = sock->sk;
 638         int err = 0;
 639         size_t target, copied = 0;
 640         long timeo;
 641
 642         if (flags & MSG_OOB)
 643                 return -EOPNOTSUPP;
 644
 645         msg->msg_namelen = 0;
 646
 647         BT_DBG("sk %p size %d", sk, size);
 648
 649         lock_sock(sk);
 650
 651         target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
 652         timeo  = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
 653
 654         do {
 655                 struct sk_buff *skb;
 656                 int chunk;
 657
 658                 skb = skb_dequeue(&sk->sk_receive_queue);
 659                 if (!skb) {
 660                         if (copied >= target)
 661                                 break;
 662
 663                         if ((err = sock_error(sk)) != 0)
 664                                 break;
 665                         if (sk->sk_shutdown & RCV_SHUTDOWN)
 666                                 break;
 667
 668                         err = -EAGAIN;
 669                         if (!timeo)
 670                                 break;
 671
 672                         timeo = rfcomm_sock_data_wait(sk, timeo);
 673
 674                         if (signal_pending(current)) {
 675                                 err = sock_intr_errno(timeo);
 676                                 goto out;
 677                         }
 678                         continue;
 679                 }
 680
 681                 chunk = min_t(unsigned int, skb->len, size);
 682                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
 683                         skb_queue_head(&sk->sk_receive_queue, skb);
 684                         if (!copied)
 685                                 copied = -EFAULT;
 686                         break;
 687                 }
 688                 copied += chunk;
 689                 size   -= chunk;
 690
 691                 if (!(flags & MSG_PEEK)) {
 692                         atomic_sub(chunk, &sk->sk_rmem_alloc);
 693
 694                         skb_pull(skb, chunk);
 695                         if (skb->len) {
 696                                 skb_queue_head(&sk->sk_receive_queue, skb);
 697                                 break;
 698                         }
 699                         kfree_skb(skb);
 700
 701                 } else {
 702                         /* put message back and return */
 703                         skb_queue_head(&sk->sk_receive_queue, skb);
 704                         break;
 705                 }
 706         } while (size);
 707
 708 out:
 709         if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2))
 710                 rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc);
 711
 712         release_sock(sk);
 713         return copied ? : err;
 714 }
 715
 716 static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
 717 {
 718         struct sock *sk = sock->sk;
 719         int err = 0;
 720         u32 opt;
 721
 722         BT_DBG("sk %p", sk);
 723
 724         lock_sock(sk);
 725
 726         switch (optname) {
 727         case RFCOMM_LM:
 728                 if (get_user(opt, (u32 __user *) optval)) {
 729                         err = -EFAULT;
 730                         break;
 731                 }
 732
 733                 rfcomm_pi(sk)->link_mode = opt;
 734                 break;
 735
 736         default:
 737                 err = -ENOPROTOOPT;
 738                 break;
 739         }
 740
 741         release_sock(sk);
 742         return err;
 743 }
 744
 745 static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
 746 {
 747         struct sock *sk = sock->sk;
 748         struct sock *l2cap_sk;
 749         struct rfcomm_conninfo cinfo;
 750         int len, err = 0;
 751
 752         BT_DBG("sk %p", sk);
 753
 754         if (get_user(len, optlen))
 755                 return -EFAULT;
 756
 757         lock_sock(sk);
 758
 759         switch (optname) {
 760         case RFCOMM_LM:
 761                 if (put_user(rfcomm_pi(sk)->link_mode, (u32 __user *) optval))
 762                         err = -EFAULT;
 763                 break;
 764
 765         case RFCOMM_CONNINFO:
 766                 if (sk->sk_state != BT_CONNECTED) {
 767                         err = -ENOTCONN;
 768                         break;
 769                 }
 770
 771                 l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk;
 772
 773                 cinfo.hci_handle = l2cap_pi(l2cap_sk)->conn->hcon->handle;
 774                 memcpy(cinfo.dev_class, l2cap_pi(l2cap_sk)->conn->hcon->dev_class, 3);
 775
 776                 len = min_t(unsigned int, len, sizeof(cinfo));
 777                 if (copy_to_user(optval, (char *) &cinfo, len))
 778                         err = -EFAULT;
 779
 780                 break;
 781
 782         default:
 783                 err = -ENOPROTOOPT;
 784                 break;
 785         }
 786
 787         release_sock(sk);
 788         return err;
 789 }
 790
 791 static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 792 {
 793         struct sock *sk = sock->sk;
 794         int err;
 795
 796         lock_sock(sk);
 797
 798 #ifdef CONFIG_BT_RFCOMM_TTY
 799         err = rfcomm_dev_ioctl(sk, cmd, (void __user *)arg);
 800 #else
 801         err = -EOPNOTSUPP;
 802 #endif
 803
 804         release_sock(sk);
 805         return err;
 806 }
 807
 808 static int rfcomm_sock_shutdown(struct socket *sock, int how)
 809 {
 810         struct sock *sk = sock->sk;
 811         int err = 0;
 812
 813         BT_DBG("sock %p, sk %p", sock, sk);
 814
 815         if (!sk) return 0;
 816
 817         lock_sock(sk);
 818         if (!sk->sk_shutdown) {
 819                 sk->sk_shutdown = SHUTDOWN_MASK;
 820                 __rfcomm_sock_close(sk);
 821
 822                 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 823                         err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
 824         }
 825         release_sock(sk);
 826         return err;
 827 }
 828
 829 static int rfcomm_sock_release(struct socket *sock)
 830 {
 831         struct sock *sk = sock->sk;
 832         int err;
 833
 834         BT_DBG("sock %p, sk %p", sock, sk);
 835
 836         if (!sk)
 837                 return 0;
 838
 839         err = rfcomm_sock_shutdown(sock, 2);
 840
 841         sock_orphan(sk);
 842         rfcomm_sock_kill(sk);
 843         return err;
 844 }
 845
 846 /* ---- RFCOMM core layer callbacks ----
 847  *
 848  * called under rfcomm_lock()
 849  */
 850 int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d)
 851 {
 852         struct sock *sk, *parent;
 853         bdaddr_t src, dst;
 854         int result = 0;
 855
 856         BT_DBG("session %p channel %d", s, channel);
 857
 858         rfcomm_session_getaddr(s, &src, &dst);
 859
 860         /* Check if we have socket listening on channel */
 861         parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src);
 862         if (!parent)
 863                 return 0;
 864
 865         /* Check for backlog size */
 866         if (sk_acceptq_is_full(parent)) {
 867                 BT_DBG("backlog full %d", parent->sk_ack_backlog);
 868                 goto done;
 869         }
 870
 871         sk = rfcomm_sock_alloc(NULL, BTPROTO_RFCOMM, GFP_ATOMIC);
 872         if (!sk)
 873                 goto done;
 874
 875         rfcomm_sock_init(sk, parent);
 876         bacpy(&bt_sk(sk)->src, &src);
 877         bacpy(&bt_sk(sk)->dst, &dst);
 878         rfcomm_pi(sk)->channel = channel;
 879
 880         sk->sk_state = BT_CONFIG;
 881         bt_accept_enqueue(parent, sk);
 882
 883         /* Accept connection and return socket DLC */
 884         *d = rfcomm_pi(sk)->dlc;
 885         result = 1;
 886
 887 done:
 888         bh_unlock_sock(parent);
 889         return result;
 890 }
 891
 892 static ssize_t rfcomm_sock_sysfs_show(struct class *dev, char *buf)
 893 {
 894         struct sock *sk;
 895         struct hlist_node *node;
 896         char *str = buf;
 897
 898         read_lock_bh(&rfcomm_sk_list.lock);
 899
 900         sk_for_each(sk, node, &rfcomm_sk_list.head) {
 901                 str += sprintf(str, "%s %s %d %d\n",
 902                                 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
 903                                 sk->sk_state, rfcomm_pi(sk)->channel);
 904         }
 905
 906         read_unlock_bh(&rfcomm_sk_list.lock);
 907
 908         return (str - buf);
 909 }
 910
 911 static CLASS_ATTR(rfcomm, S_IRUGO, rfcomm_sock_sysfs_show, NULL);
 912
 913 static const struct proto_ops rfcomm_sock_ops = {
 914         .family         = PF_BLUETOOTH,
 915         .owner          = THIS_MODULE,
 916         .release        = rfcomm_sock_release,
 917         .bind           = rfcomm_sock_bind,
 918         .connect        = rfcomm_sock_connect,
 919         .listen         = rfcomm_sock_listen,
 920         .accept         = rfcomm_sock_accept,
 921         .getname        = rfcomm_sock_getname,
 922         .sendmsg        = rfcomm_sock_sendmsg,
 923         .recvmsg        = rfcomm_sock_recvmsg,
 924         .shutdown       = rfcomm_sock_shutdown,
 925         .setsockopt     = rfcomm_sock_setsockopt,
 926         .getsockopt     = rfcomm_sock_getsockopt,
 927         .ioctl          = rfcomm_sock_ioctl,
 928         .poll           = bt_sock_poll,
 929         .socketpair     = sock_no_socketpair,
 930         .mmap           = sock_no_mmap
 931 };
 932
 933 static struct net_proto_family rfcomm_sock_family_ops = {
 934         .family         = PF_BLUETOOTH,
 935         .owner          = THIS_MODULE,
 936         .create         = rfcomm_sock_create
 937 };
 938
 939 int __init rfcomm_init_sockets(void)
 940 {
 941         int err;
 942
 943         err = proto_register(&rfcomm_proto, 0);
 944         if (err < 0)
 945                 return err;
 946
 947         err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops);
 948         if (err < 0)
 949                 goto error;
 950
 951         class_create_file(&bt_class, &class_attr_rfcomm);
 952
 953         BT_INFO("RFCOMM socket layer initialized");
 954
 955         return 0;
 956
 957 error:
 958         BT_ERR("RFCOMM socket layer registration failed");
 959         proto_unregister(&rfcomm_proto);
 960         return err;
 961 }
 962
 963 void __exit rfcomm_cleanup_sockets(void)
 964 {
 965         class_remove_file(&bt_class, &class_attr_rfcomm);
 966
 967         if (bt_sock_unregister(BTPROTO_RFCOMM) < 0)
 968                 BT_ERR("RFCOMM socket layer unregistration failed");
 969
 970         proto_unregister(&rfcomm_proto);
 971 }