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   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/proc_fs.h>
  46 #include <linux/seq_file.h>
  47 #include <net/sock.h>
  48
  49 #include <asm/system.h>
  50 #include <asm/uaccess.h>
  51
  52 #include <net/bluetooth/bluetooth.h>
  53 #include <net/bluetooth/hci_core.h>
  54 #include <net/bluetooth/l2cap.h>
  55 #include <net/bluetooth/rfcomm.h>
  56
  57 #ifndef CONFIG_BT_RFCOMM_DEBUG
  58 #undef  BT_DBG
  59 #define BT_DBG(D...)
  60 #endif
  61
  62 static struct proto_ops rfcomm_sock_ops;
  63
  64 static struct bt_sock_list rfcomm_sk_list = {
  65         .lock = RW_LOCK_UNLOCKED
  66 };
  67
  68 static void rfcomm_sock_close(struct sock *sk);
  69 static void rfcomm_sock_kill(struct sock *sk);
  70
  71 /* ---- DLC callbacks ----
  72  *
  73  * called under rfcomm_dlc_lock()
  74  */
  75 static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb)
  76 {
  77         struct sock *sk = d->owner;
  78         if (!sk)
  79                 return;
  80
  81         atomic_add(skb->len, &sk->sk_rmem_alloc);
  82         skb_queue_tail(&sk->sk_receive_queue, skb);
  83         sk->sk_data_ready(sk, skb->len);
  84
  85         if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
  86                 rfcomm_dlc_throttle(d);
  87 }
  88
  89 static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err)
  90 {
  91         struct sock *sk = d->owner, *parent;
  92         if (!sk)
  93                 return;
  94
  95         BT_DBG("dlc %p state %ld err %d", d, d->state, err);
  96
  97         bh_lock_sock(sk);
  98
  99         if (err)
 100                 sk->sk_err = err;
 101
 102         sk->sk_state = d->state;
 103
 104         parent = bt_sk(sk)->parent;
 105         if (parent) {
 106                 if (d->state == BT_CLOSED) {
 107                         sock_set_flag(sk, SOCK_ZAPPED);
 108                         bt_accept_unlink(sk);
 109                 }
 110                 parent->sk_data_ready(parent, 0);
 111         } else {
 112                 if (d->state == BT_CONNECTED)
 113                         rfcomm_session_getaddr(d->session, &bt_sk(sk)->src, NULL);
 114                 sk->sk_state_change(sk);
 115         }
 116
 117         bh_unlock_sock(sk);
 118
 119         if (parent && sock_flag(sk, SOCK_ZAPPED)) {
 120                 /* We have to drop DLC lock here, otherwise
 121                  * rfcomm_sock_destruct() will dead lock. */
 122                 rfcomm_dlc_unlock(d);
 123                 rfcomm_sock_kill(sk);
 124                 rfcomm_dlc_lock(d);
 125         }
 126 }
 127
 128 /* ---- Socket functions ---- */
 129 static struct sock *__rfcomm_get_sock_by_addr(u8 channel, bdaddr_t *src)
 130 {
 131         struct sock *sk = NULL;
 132         struct hlist_node *node;
 133
 134         sk_for_each(sk, node, &rfcomm_sk_list.head) {
 135                 if (rfcomm_pi(sk)->channel == channel &&
 136                                 !bacmp(&bt_sk(sk)->src, src))
 137                         break;
 138         }
 139
 140         return node ? sk : NULL;
 141 }
 142
 143 /* Find socket with channel and source bdaddr.
 144  * Returns closest match.
 145  */
 146 static struct sock *__rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src)
 147 {
 148         struct sock *sk = NULL, *sk1 = NULL;
 149         struct hlist_node *node;
 150
 151         sk_for_each(sk, node, &rfcomm_sk_list.head) {
 152                 if (state && sk->sk_state != state)
 153                         continue;
 154
 155                 if (rfcomm_pi(sk)->channel == channel) {
 156                         /* Exact match. */
 157                         if (!bacmp(&bt_sk(sk)->src, src))
 158                                 break;
 159
 160                         /* Closest match */
 161                         if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
 162                                 sk1 = sk;
 163                 }
 164         }
 165         return node ? sk : sk1;
 166 }
 167
 168 /* Find socket with given address (channel, src).
 169  * Returns locked socket */
 170 static inline struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src)
 171 {
 172         struct sock *s;
 173         read_lock(&rfcomm_sk_list.lock);
 174         s = __rfcomm_get_sock_by_channel(state, channel, src);
 175         if (s) bh_lock_sock(s);
 176         read_unlock(&rfcomm_sk_list.lock);
 177         return s;
 178 }
 179
 180 static void rfcomm_sock_destruct(struct sock *sk)
 181 {
 182         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 183
 184         BT_DBG("sk %p dlc %p", sk, d);
 185
 186         skb_queue_purge(&sk->sk_receive_queue);
 187         skb_queue_purge(&sk->sk_write_queue);
 188
 189         rfcomm_dlc_lock(d);
 190         rfcomm_pi(sk)->dlc = NULL;
 191
 192         /* Detach DLC if it's owned by this socket */
 193         if (d->owner == sk)
 194                 d->owner = NULL;
 195         rfcomm_dlc_unlock(d);
 196
 197         rfcomm_dlc_put(d);
 198 }
 199
 200 static void rfcomm_sock_cleanup_listen(struct sock *parent)
 201 {
 202         struct sock *sk;
 203
 204         BT_DBG("parent %p", parent);
 205
 206         /* Close not yet accepted dlcs */
 207         while ((sk = bt_accept_dequeue(parent, NULL))) {
 208                 rfcomm_sock_close(sk);
 209                 rfcomm_sock_kill(sk);
 210         }
 211
 212         parent->sk_state  = BT_CLOSED;
 213         sock_set_flag(parent, SOCK_ZAPPED);
 214 }
 215
 216 /* Kill socket (only if zapped and orphan)
 217  * Must be called on unlocked socket.
 218  */
 219 static void rfcomm_sock_kill(struct sock *sk)
 220 {
 221         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 222                 return;
 223
 224         BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 225
 226         /* Kill poor orphan */
 227         bt_sock_unlink(&rfcomm_sk_list, sk);
 228         sock_set_flag(sk, SOCK_DEAD);
 229         sock_put(sk);
 230 }
 231
 232 static void __rfcomm_sock_close(struct sock *sk)
 233 {
 234         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 235
 236         BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
 237
 238         switch (sk->sk_state) {
 239         case BT_LISTEN:
 240                 rfcomm_sock_cleanup_listen(sk);
 241                 break;
 242
 243         case BT_CONNECT:
 244         case BT_CONNECT2:
 245         case BT_CONFIG:
 246         case BT_CONNECTED:
 247                 rfcomm_dlc_close(d, 0);
 248
 249         default:
 250                 sock_set_flag(sk, SOCK_ZAPPED);
 251                 break;
 252         }
 253 }
 254
 255 /* Close socket.
 256  * Must be called on unlocked socket.
 257  */
 258 static void rfcomm_sock_close(struct sock *sk)
 259 {
 260         lock_sock(sk);
 261         __rfcomm_sock_close(sk);
 262         release_sock(sk);
 263 }
 264
 265 static void rfcomm_sock_init(struct sock *sk, struct sock *parent)
 266 {
 267         struct rfcomm_pinfo *pi = rfcomm_pi(sk);
 268
 269         BT_DBG("sk %p", sk);
 270
 271         if (parent) {
 272                 sk->sk_type = parent->sk_type;
 273                 pi->link_mode = rfcomm_pi(parent)->link_mode;
 274         } else {
 275                 pi->link_mode = 0;
 276         }
 277
 278         pi->dlc->link_mode = pi->link_mode;
 279 }
 280
 281 static struct proto rfcomm_proto = {
 282         .name           = "RFCOMM",
 283         .owner          = THIS_MODULE,
 284         .obj_size       = sizeof(struct rfcomm_pinfo)
 285 };
 286
 287 static struct sock *rfcomm_sock_alloc(struct socket *sock, int proto, gfp_t prio)
 288 {
 289         struct rfcomm_dlc *d;
 290         struct sock *sk;
 291
 292         sk = sk_alloc(PF_BLUETOOTH, prio, &rfcomm_proto, 1);
 293         if (!sk)
 294                 return NULL;
 295
 296         sock_init_data(sock, sk);
 297         INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
 298
 299         d = rfcomm_dlc_alloc(prio);
 300         if (!d) {
 301                 sk_free(sk);
 302                 return NULL;
 303         }
 304
 305         d->data_ready   = rfcomm_sk_data_ready;
 306         d->state_change = rfcomm_sk_state_change;
 307
 308         rfcomm_pi(sk)->dlc = d;
 309         d->owner = sk;
 310
 311         sk->sk_destruct = rfcomm_sock_destruct;
 312         sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT;
 313
 314         sk->sk_sndbuf   = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
 315         sk->sk_rcvbuf   = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
 316
 317         sock_reset_flag(sk, SOCK_ZAPPED);
 318
 319         sk->sk_protocol = proto;
 320         sk->sk_state    = BT_OPEN;
 321
 322         bt_sock_link(&rfcomm_sk_list, sk);
 323
 324         BT_DBG("sk %p", sk);
 325         return sk;
 326 }
 327
 328 static int rfcomm_sock_create(struct socket *sock, int protocol)
 329 {
 330         struct sock *sk;
 331
 332         BT_DBG("sock %p", sock);
 333
 334         sock->state = SS_UNCONNECTED;
 335
 336         if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW)
 337                 return -ESOCKTNOSUPPORT;
 338
 339         sock->ops = &rfcomm_sock_ops;
 340
 341         if (!(sk = rfcomm_sock_alloc(sock, protocol, GFP_KERNEL)))
 342                 return -ENOMEM;
 343
 344         rfcomm_sock_init(sk, NULL);
 345         return 0;
 346 }
 347
 348 static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 349 {
 350         struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
 351         struct sock *sk = sock->sk;
 352         int err = 0;
 353
 354         BT_DBG("sk %p %s", sk, batostr(&sa->rc_bdaddr));
 355
 356         if (!addr || addr->sa_family != AF_BLUETOOTH)
 357                 return -EINVAL;
 358
 359         lock_sock(sk);
 360
 361         if (sk->sk_state != BT_OPEN) {
 362                 err = -EBADFD;
 363                 goto done;
 364         }
 365
 366         if (sk->sk_type != SOCK_STREAM) {
 367                 err = -EINVAL;
 368                 goto done;
 369         }
 370
 371         write_lock_bh(&rfcomm_sk_list.lock);
 372
 373         if (sa->rc_channel && __rfcomm_get_sock_by_addr(sa->rc_channel, &sa->rc_bdaddr)) {
 374                 err = -EADDRINUSE;
 375         } else {
 376                 /* Save source address */
 377                 bacpy(&bt_sk(sk)->src, &sa->rc_bdaddr);
 378                 rfcomm_pi(sk)->channel = sa->rc_channel;
 379                 sk->sk_state = BT_BOUND;
 380         }
 381
 382         write_unlock_bh(&rfcomm_sk_list.lock);
 383
 384 done:
 385         release_sock(sk);
 386         return err;
 387 }
 388
 389 static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
 390 {
 391         struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
 392         struct sock *sk = sock->sk;
 393         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 394         int err = 0;
 395
 396         BT_DBG("sk %p", sk);
 397
 398         if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_rc))
 399                 return -EINVAL;
 400
 401         lock_sock(sk);
 402
 403         if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) {
 404                 err = -EBADFD;
 405                 goto done;
 406         }
 407
 408         if (sk->sk_type != SOCK_STREAM) {
 409                 err = -EINVAL;
 410                 goto done;
 411         }
 412
 413         sk->sk_state = BT_CONNECT;
 414         bacpy(&bt_sk(sk)->dst, &sa->rc_bdaddr);
 415         rfcomm_pi(sk)->channel = sa->rc_channel;
 416
 417         err = rfcomm_dlc_open(d, &bt_sk(sk)->src, &sa->rc_bdaddr, sa->rc_channel);
 418         if (!err)
 419                 err = bt_sock_wait_state(sk, BT_CONNECTED,
 420                                 sock_sndtimeo(sk, flags & O_NONBLOCK));
 421
 422 done:
 423         release_sock(sk);
 424         return err;
 425 }
 426
 427 static int rfcomm_sock_listen(struct socket *sock, int backlog)
 428 {
 429         struct sock *sk = sock->sk;
 430         int err = 0;
 431
 432         BT_DBG("sk %p backlog %d", sk, backlog);
 433
 434         lock_sock(sk);
 435
 436         if (sk->sk_state != BT_BOUND) {
 437                 err = -EBADFD;
 438                 goto done;
 439         }
 440
 441         if (sk->sk_type != SOCK_STREAM) {
 442                 err = -EINVAL;
 443                 goto done;
 444         }
 445
 446         if (!rfcomm_pi(sk)->channel) {
 447                 bdaddr_t *src = &bt_sk(sk)->src;
 448                 u8 channel;
 449
 450                 err = -EINVAL;
 451
 452                 write_lock_bh(&rfcomm_sk_list.lock);
 453
 454                 for (channel = 1; channel < 31; channel++)
 455                         if (!__rfcomm_get_sock_by_addr(channel, src)) {
 456                                 rfcomm_pi(sk)->channel = channel;
 457                                 err = 0;
 458                                 break;
 459                         }
 460
 461                 write_unlock_bh(&rfcomm_sk_list.lock);
 462
 463                 if (err < 0)
 464                         goto done;
 465         }
 466
 467         sk->sk_max_ack_backlog = backlog;
 468         sk->sk_ack_backlog = 0;
 469         sk->sk_state = BT_LISTEN;
 470
 471 done:
 472         release_sock(sk);
 473         return err;
 474 }
 475
 476 static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags)
 477 {
 478         DECLARE_WAITQUEUE(wait, current);
 479         struct sock *sk = sock->sk, *nsk;
 480         long timeo;
 481         int err = 0;
 482
 483         lock_sock(sk);
 484
 485         if (sk->sk_state != BT_LISTEN) {
 486                 err = -EBADFD;
 487                 goto done;
 488         }
 489
 490         if (sk->sk_type != SOCK_STREAM) {
 491                 err = -EINVAL;
 492                 goto done;
 493         }
 494
 495         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 496
 497         BT_DBG("sk %p timeo %ld", sk, timeo);
 498
 499         /* Wait for an incoming connection. (wake-one). */
 500         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 501         while (!(nsk = bt_accept_dequeue(sk, newsock))) {
 502                 set_current_state(TASK_INTERRUPTIBLE);
 503                 if (!timeo) {
 504                         err = -EAGAIN;
 505                         break;
 506                 }
 507
 508                 release_sock(sk);
 509                 timeo = schedule_timeout(timeo);
 510                 lock_sock(sk);
 511
 512                 if (sk->sk_state != BT_LISTEN) {
 513                         err = -EBADFD;
 514                         break;
 515                 }
 516
 517                 if (signal_pending(current)) {
 518                         err = sock_intr_errno(timeo);
 519                         break;
 520                 }
 521         }
 522         set_current_state(TASK_RUNNING);
 523         remove_wait_queue(sk->sk_sleep, &wait);
 524
 525         if (err)
 526                 goto done;
 527
 528         newsock->state = SS_CONNECTED;
 529
 530         BT_DBG("new socket %p", nsk);
 531
 532 done:
 533         release_sock(sk);
 534         return err;
 535 }
 536
 537 static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
 538 {
 539         struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
 540         struct sock *sk = sock->sk;
 541
 542         BT_DBG("sock %p, sk %p", sock, sk);
 543
 544         sa->rc_family  = AF_BLUETOOTH;
 545         sa->rc_channel = rfcomm_pi(sk)->channel;
 546         if (peer)
 547                 bacpy(&sa->rc_bdaddr, &bt_sk(sk)->dst);
 548         else
 549                 bacpy(&sa->rc_bdaddr, &bt_sk(sk)->src);
 550
 551         *len = sizeof(struct sockaddr_rc);
 552         return 0;
 553 }
 554
 555 static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 556                                struct msghdr *msg, size_t len)
 557 {
 558         struct sock *sk = sock->sk;
 559         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 560         struct sk_buff *skb;
 561         int err;
 562         int sent = 0;
 563
 564         if (msg->msg_flags & MSG_OOB)
 565                 return -EOPNOTSUPP;
 566
 567         if (sk->sk_shutdown & SEND_SHUTDOWN)
 568                 return -EPIPE;
 569
 570         BT_DBG("sock %p, sk %p", sock, sk);
 571
 572         lock_sock(sk);
 573
 574         while (len) {
 575                 size_t size = min_t(size_t, len, d->mtu);
 576
 577                 skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE,
 578                                 msg->msg_flags & MSG_DONTWAIT, &err);
 579                 if (!skb)
 580                         break;
 581                 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
 582
 583                 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
 584                 if (err) {
 585                         kfree_skb(skb);
 586                         sent = err;
 587                         break;
 588                 }
 589
 590                 err = rfcomm_dlc_send(d, skb);
 591                 if (err < 0) {
 592                         kfree_skb(skb);
 593                         break;
 594                 }
 595
 596                 sent += size;
 597                 len  -= size;
 598         }
 599
 600         release_sock(sk);
 601
 602         return sent ? sent : err;
 603 }
 604
 605 static long rfcomm_sock_data_wait(struct sock *sk, long timeo)
 606 {
 607         DECLARE_WAITQUEUE(wait, current);
 608
 609         add_wait_queue(sk->sk_sleep, &wait);
 610         for (;;) {
 611                 set_current_state(TASK_INTERRUPTIBLE);
 612
 613                 if (!skb_queue_empty(&sk->sk_receive_queue) ||
 614                     sk->sk_err ||
 615                     (sk->sk_shutdown & RCV_SHUTDOWN) ||
 616                     signal_pending(current) ||
 617                     !timeo)
 618                         break;
 619
 620                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 621                 release_sock(sk);
 622                 timeo = schedule_timeout(timeo);
 623                 lock_sock(sk);
 624                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
 625         }
 626
 627         __set_current_state(TASK_RUNNING);
 628         remove_wait_queue(sk->sk_sleep, &wait);
 629         return timeo;
 630 }
 631
 632 static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 633                                struct msghdr *msg, size_t size, int flags)
 634 {
 635         struct sock *sk = sock->sk;
 636         int err = 0;
 637         size_t target, copied = 0;
 638         long timeo;
 639
 640         if (flags & MSG_OOB)
 641                 return -EOPNOTSUPP;
 642
 643         msg->msg_namelen = 0;
 644
 645         BT_DBG("sk %p size %d", sk, size);
 646
 647         lock_sock(sk);
 648
 649         target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
 650         timeo  = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
 651
 652         do {
 653                 struct sk_buff *skb;
 654                 int chunk;
 655
 656                 skb = skb_dequeue(&sk->sk_receive_queue);
 657                 if (!skb) {
 658                         if (copied >= target)
 659                                 break;
 660
 661                         if ((err = sock_error(sk)) != 0)
 662                                 break;
 663                         if (sk->sk_shutdown & RCV_SHUTDOWN)
 664                                 break;
 665
 666                         err = -EAGAIN;
 667                         if (!timeo)
 668                                 break;
 669
 670                         timeo = rfcomm_sock_data_wait(sk, timeo);
 671
 672                         if (signal_pending(current)) {
 673                                 err = sock_intr_errno(timeo);
 674                                 goto out;
 675                         }
 676                         continue;
 677                 }
 678
 679                 chunk = min_t(unsigned int, skb->len, size);
 680                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
 681                         skb_queue_head(&sk->sk_receive_queue, skb);
 682                         if (!copied)
 683                                 copied = -EFAULT;
 684                         break;
 685                 }
 686                 copied += chunk;
 687                 size   -= chunk;
 688
 689                 if (!(flags & MSG_PEEK)) {
 690                         atomic_sub(chunk, &sk->sk_rmem_alloc);
 691
 692                         skb_pull(skb, chunk);
 693                         if (skb->len) {
 694                                 skb_queue_head(&sk->sk_receive_queue, skb);
 695                                 break;
 696                         }
 697                         kfree_skb(skb);
 698
 699                 } else {
 700                         /* put message back and return */
 701                         skb_queue_head(&sk->sk_receive_queue, skb);
 702                         break;
 703                 }
 704         } while (size);
 705
 706 out:
 707         if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2))
 708                 rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc);
 709
 710         release_sock(sk);
 711         return copied ? : err;
 712 }
 713
 714 static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
 715 {
 716         struct sock *sk = sock->sk;
 717         int err = 0;
 718         u32 opt;
 719
 720         BT_DBG("sk %p", sk);
 721
 722         lock_sock(sk);
 723
 724         switch (optname) {
 725         case RFCOMM_LM:
 726                 if (get_user(opt, (u32 __user *) optval)) {
 727                         err = -EFAULT;
 728                         break;
 729                 }
 730
 731                 rfcomm_pi(sk)->link_mode = opt;
 732                 break;
 733
 734         default:
 735                 err = -ENOPROTOOPT;
 736                 break;
 737         }
 738
 739         release_sock(sk);
 740         return err;
 741 }
 742
 743 static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
 744 {
 745         struct sock *sk = sock->sk;
 746         struct sock *l2cap_sk;
 747         struct rfcomm_conninfo cinfo;
 748         int len, err = 0;
 749
 750         BT_DBG("sk %p", sk);
 751
 752         if (get_user(len, optlen))
 753                 return -EFAULT;
 754
 755         lock_sock(sk);
 756
 757         switch (optname) {
 758         case RFCOMM_LM:
 759                 if (put_user(rfcomm_pi(sk)->link_mode, (u32 __user *) optval))
 760                         err = -EFAULT;
 761                 break;
 762
 763         case RFCOMM_CONNINFO:
 764                 if (sk->sk_state != BT_CONNECTED) {
 765                         err = -ENOTCONN;
 766                         break;
 767                 }
 768
 769                 l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk;
 770
 771                 cinfo.hci_handle = l2cap_pi(l2cap_sk)->conn->hcon->handle;
 772                 memcpy(cinfo.dev_class, l2cap_pi(l2cap_sk)->conn->hcon->dev_class, 3);
 773
 774                 len = min_t(unsigned int, len, sizeof(cinfo));
 775                 if (copy_to_user(optval, (char *) &cinfo, len))
 776                         err = -EFAULT;
 777
 778                 break;
 779
 780         default:
 781                 err = -ENOPROTOOPT;
 782                 break;
 783         }
 784
 785         release_sock(sk);
 786         return err;
 787 }
 788
 789 static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 790 {
 791         struct sock *sk = sock->sk;
 792         int err;
 793
 794         lock_sock(sk);
 795
 796 #ifdef CONFIG_BT_RFCOMM_TTY
 797         err = rfcomm_dev_ioctl(sk, cmd, (void __user *)arg);
 798 #else
 799         err = -EOPNOTSUPP;
 800 #endif
 801
 802         release_sock(sk);
 803         return err;
 804 }
 805
 806 static int rfcomm_sock_shutdown(struct socket *sock, int how)
 807 {
 808         struct sock *sk = sock->sk;
 809         int err = 0;
 810
 811         BT_DBG("sock %p, sk %p", sock, sk);
 812
 813         if (!sk) return 0;
 814
 815         lock_sock(sk);
 816         if (!sk->sk_shutdown) {
 817                 sk->sk_shutdown = SHUTDOWN_MASK;
 818                 __rfcomm_sock_close(sk);
 819
 820                 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 821                         err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
 822         }
 823         release_sock(sk);
 824         return err;
 825 }
 826
 827 static int rfcomm_sock_release(struct socket *sock)
 828 {
 829         struct sock *sk = sock->sk;
 830         int err;
 831
 832         BT_DBG("sock %p, sk %p", sock, sk);
 833
 834         if (!sk)
 835                 return 0;
 836
 837         err = rfcomm_sock_shutdown(sock, 2);
 838
 839         sock_orphan(sk);
 840         rfcomm_sock_kill(sk);
 841         return err;
 842 }
 843
 844 /* ---- RFCOMM core layer callbacks ----
 845  *
 846  * called under rfcomm_lock()
 847  */
 848 int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d)
 849 {
 850         struct sock *sk, *parent;
 851         bdaddr_t src, dst;
 852         int result = 0;
 853
 854         BT_DBG("session %p channel %d", s, channel);
 855
 856         rfcomm_session_getaddr(s, &src, &dst);
 857
 858         /* Check if we have socket listening on channel */
 859         parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src);
 860         if (!parent)
 861                 return 0;
 862
 863         /* Check for backlog size */
 864         if (sk_acceptq_is_full(parent)) {
 865                 BT_DBG("backlog full %d", parent->sk_ack_backlog);
 866                 goto done;
 867         }
 868
 869         sk = rfcomm_sock_alloc(NULL, BTPROTO_RFCOMM, GFP_ATOMIC);
 870         if (!sk)
 871                 goto done;
 872
 873         rfcomm_sock_init(sk, parent);
 874         bacpy(&bt_sk(sk)->src, &src);
 875         bacpy(&bt_sk(sk)->dst, &dst);
 876         rfcomm_pi(sk)->channel = channel;
 877
 878         sk->sk_state = BT_CONFIG;
 879         bt_accept_enqueue(parent, sk);
 880
 881         /* Accept connection and return socket DLC */
 882         *d = rfcomm_pi(sk)->dlc;
 883         result = 1;
 884
 885 done:
 886         bh_unlock_sock(parent);
 887         return result;
 888 }
 889
 890 /* ---- Proc fs support ---- */
 891 #ifdef CONFIG_PROC_FS
 892 static void *rfcomm_seq_start(struct seq_file *seq, loff_t *pos)
 893 {
 894         struct sock *sk;
 895         struct hlist_node *node;
 896         loff_t l = *pos;
 897
 898         read_lock_bh(&rfcomm_sk_list.lock);
 899
 900         sk_for_each(sk, node, &rfcomm_sk_list.head)
 901                 if (!l--)
 902                         return sk;
 903         return NULL;
 904 }
 905
 906 static void *rfcomm_seq_next(struct seq_file *seq, void *e, loff_t *pos)
 907 {
 908         struct sock *sk = e;
 909         (*pos)++;
 910         return sk_next(sk);
 911 }
 912
 913 static void rfcomm_seq_stop(struct seq_file *seq, void *e)
 914 {
 915         read_unlock_bh(&rfcomm_sk_list.lock);
 916 }
 917
 918 static int  rfcomm_seq_show(struct seq_file *seq, void *e)
 919 {
 920         struct sock *sk = e;
 921         seq_printf(seq, "%s %s %d %d\n",
 922                         batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
 923                         sk->sk_state, rfcomm_pi(sk)->channel);
 924         return 0;
 925 }
 926
 927 static struct seq_operations rfcomm_seq_ops = {
 928         .start  = rfcomm_seq_start,
 929         .next   = rfcomm_seq_next,
 930         .stop   = rfcomm_seq_stop,
 931         .show   = rfcomm_seq_show
 932 };
 933
 934 static int rfcomm_seq_open(struct inode *inode, struct file *file)
 935 {
 936         return seq_open(file, &rfcomm_seq_ops);
 937 }
 938
 939 static struct file_operations rfcomm_seq_fops = {
 940         .owner   = THIS_MODULE,
 941         .open    = rfcomm_seq_open,
 942         .read    = seq_read,
 943         .llseek  = seq_lseek,
 944         .release = seq_release,
 945 };
 946
 947 static int  __init rfcomm_sock_proc_init(void)
 948 {
 949         struct proc_dir_entry *p = create_proc_entry("sock", S_IRUGO, proc_bt_rfcomm);
 950         if (!p)
 951                 return -ENOMEM;
 952         p->proc_fops = &rfcomm_seq_fops;
 953         return 0;
 954 }
 955
 956 static void __exit rfcomm_sock_proc_cleanup(void)
 957 {
 958         remove_proc_entry("sock", proc_bt_rfcomm);
 959 }
 960
 961 #else /* CONFIG_PROC_FS */
 962
 963 static int  __init rfcomm_sock_proc_init(void)
 964 {
 965         return 0;
 966 }
 967
 968 static void __exit rfcomm_sock_proc_cleanup(void)
 969 {
 970         return;
 971 }
 972 #endif /* CONFIG_PROC_FS */
 973
 974 static struct proto_ops rfcomm_sock_ops = {
 975         .family         = PF_BLUETOOTH,
 976         .owner          = THIS_MODULE,
 977         .release        = rfcomm_sock_release,
 978         .bind           = rfcomm_sock_bind,
 979         .connect        = rfcomm_sock_connect,
 980         .listen         = rfcomm_sock_listen,
 981         .accept         = rfcomm_sock_accept,
 982         .getname        = rfcomm_sock_getname,
 983         .sendmsg        = rfcomm_sock_sendmsg,
 984         .recvmsg        = rfcomm_sock_recvmsg,
 985         .shutdown       = rfcomm_sock_shutdown,
 986         .setsockopt     = rfcomm_sock_setsockopt,
 987         .getsockopt     = rfcomm_sock_getsockopt,
 988         .ioctl          = rfcomm_sock_ioctl,
 989         .poll           = bt_sock_poll,
 990         .socketpair     = sock_no_socketpair,
 991         .mmap           = sock_no_mmap
 992 };
 993
 994 static struct net_proto_family rfcomm_sock_family_ops = {
 995         .family         = PF_BLUETOOTH,
 996         .owner          = THIS_MODULE,
 997         .create         = rfcomm_sock_create
 998 };
 999
1000 int  __init rfcomm_init_sockets(void)
1001 {
1002         int err;
1003
1004         err = proto_register(&rfcomm_proto, 0);
1005         if (err < 0)
1006                 return err;
1007
1008         err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops);
1009         if (err < 0)
1010                 goto error;
1011
1012         rfcomm_sock_proc_init();
1013
1014         BT_INFO("RFCOMM socket layer initialized");
1015
1016         return 0;
1017
1018 error:
1019         BT_ERR("RFCOMM socket layer registration failed");
1020         proto_unregister(&rfcomm_proto);
1021         return err;
1022 }
1023
1024 void __exit rfcomm_cleanup_sockets(void)
1025 {
1026         rfcomm_sock_proc_cleanup();
1027
1028         if (bt_sock_unregister(BTPROTO_RFCOMM) < 0)
1029                 BT_ERR("RFCOMM socket layer unregistration failed");
1030
1031         proto_unregister(&rfcomm_proto);
1032 }