kernel/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
  28 #include <linux/export.h>
  29 #include <linux/debugfs.h>
  30
  31 #include <net/bluetooth/bluetooth.h>
  32 #include <net/bluetooth/hci_core.h>
  33 #include <net/bluetooth/l2cap.h>
  34 #include <net/bluetooth/rfcomm.h>
  35
  36 static const struct proto_ops rfcomm_sock_ops;
  37
  38 static struct bt_sock_list rfcomm_sk_list = {
  39         .lock = __RW_LOCK_UNLOCKED(rfcomm_sk_list.lock)
  40 };
  41
  42 static void rfcomm_sock_close(struct sock *sk);
  43 static void rfcomm_sock_kill(struct sock *sk);
  44
  45 /* ---- DLC callbacks ----
  46  *
  47  * called under rfcomm_dlc_lock()
  48  */
  49 static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb)
  50 {
  51         struct sock *sk = d->owner;
  52         if (!sk)
  53                 return;
  54
  55         atomic_add(skb->len, &sk->sk_rmem_alloc);
  56         skb_queue_tail(&sk->sk_receive_queue, skb);
  57         sk->sk_data_ready(sk);
  58
  59         if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
  60                 rfcomm_dlc_throttle(d);
  61 }
  62
  63 static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err)
  64 {
  65         struct sock *sk = d->owner, *parent;
  66         unsigned long flags;
  67
  68         if (!sk)
  69                 return;
  70
  71         BT_DBG("dlc %p state %ld err %d", d, d->state, err);
  72
  73         local_irq_save(flags);
  74         bh_lock_sock(sk);
  75
  76         if (err)
  77                 sk->sk_err = err;
  78
  79         sk->sk_state = d->state;
  80
  81         parent = bt_sk(sk)->parent;
  82         if (parent) {
  83                 if (d->state == BT_CLOSED) {
  84                         sock_set_flag(sk, SOCK_ZAPPED);
  85                         bt_accept_unlink(sk);
  86                 }
  87                 parent->sk_data_ready(parent);
  88         } else {
  89                 if (d->state == BT_CONNECTED)
  90                         rfcomm_session_getaddr(d->session,
  91                                                &rfcomm_pi(sk)->src, NULL);
  92                 sk->sk_state_change(sk);
  93         }
  94
  95         bh_unlock_sock(sk);
  96         local_irq_restore(flags);
  97
  98         if (parent && sock_flag(sk, SOCK_ZAPPED)) {
  99                 /* We have to drop DLC lock here, otherwise
 100                  * rfcomm_sock_destruct() will dead lock. */
 101                 rfcomm_dlc_unlock(d);
 102                 rfcomm_sock_kill(sk);
 103                 rfcomm_dlc_lock(d);
 104         }
 105 }
 106
 107 /* ---- Socket functions ---- */
 108 static struct sock *__rfcomm_get_listen_sock_by_addr(u8 channel, bdaddr_t *src)
 109 {
 110         struct sock *sk = NULL;
 111
 112         sk_for_each(sk, &rfcomm_sk_list.head) {
 113                 if (rfcomm_pi(sk)->channel != channel)
 114                         continue;
 115
 116                 if (bacmp(&rfcomm_pi(sk)->src, src))
 117                         continue;
 118
 119                 if (sk->sk_state == BT_BOUND || sk->sk_state == BT_LISTEN)
 120                         break;
 121         }
 122
 123         return sk ? sk : NULL;
 124 }
 125
 126 /* Find socket with channel and source bdaddr.
 127  * Returns closest match.
 128  */
 129 static struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src)
 130 {
 131         struct sock *sk = NULL, *sk1 = NULL;
 132
 133         read_lock(&rfcomm_sk_list.lock);
 134
 135         sk_for_each(sk, &rfcomm_sk_list.head) {
 136                 if (state && sk->sk_state != state)
 137                         continue;
 138
 139                 if (rfcomm_pi(sk)->channel == channel) {
 140                         /* Exact match. */
 141                         if (!bacmp(&rfcomm_pi(sk)->src, src))
 142                                 break;
 143
 144                         /* Closest match */
 145                         if (!bacmp(&rfcomm_pi(sk)->src, BDADDR_ANY))
 146                                 sk1 = sk;
 147                 }
 148         }
 149
 150         read_unlock(&rfcomm_sk_list.lock);
 151
 152         return sk ? sk : sk1;
 153 }
 154
 155 static void rfcomm_sock_destruct(struct sock *sk)
 156 {
 157         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 158
 159         BT_DBG("sk %p dlc %p", sk, d);
 160
 161         skb_queue_purge(&sk->sk_receive_queue);
 162         skb_queue_purge(&sk->sk_write_queue);
 163
 164         rfcomm_dlc_lock(d);
 165         rfcomm_pi(sk)->dlc = NULL;
 166
 167         /* Detach DLC if it's owned by this socket */
 168         if (d->owner == sk)
 169                 d->owner = NULL;
 170         rfcomm_dlc_unlock(d);
 171
 172         rfcomm_dlc_put(d);
 173 }
 174
 175 static void rfcomm_sock_cleanup_listen(struct sock *parent)
 176 {
 177         struct sock *sk;
 178
 179         BT_DBG("parent %p", parent);
 180
 181         /* Close not yet accepted dlcs */
 182         while ((sk = bt_accept_dequeue(parent, NULL))) {
 183                 rfcomm_sock_close(sk);
 184                 rfcomm_sock_kill(sk);
 185         }
 186
 187         parent->sk_state  = BT_CLOSED;
 188         sock_set_flag(parent, SOCK_ZAPPED);
 189 }
 190
 191 /* Kill socket (only if zapped and orphan)
 192  * Must be called on unlocked socket.
 193  */
 194 static void rfcomm_sock_kill(struct sock *sk)
 195 {
 196         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 197                 return;
 198
 199         BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
 200
 201         /* Kill poor orphan */
 202         bt_sock_unlink(&rfcomm_sk_list, sk);
 203         sock_set_flag(sk, SOCK_DEAD);
 204         sock_put(sk);
 205 }
 206
 207 static void __rfcomm_sock_close(struct sock *sk)
 208 {
 209         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 210
 211         BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
 212
 213         switch (sk->sk_state) {
 214         case BT_LISTEN:
 215                 rfcomm_sock_cleanup_listen(sk);
 216                 break;
 217
 218         case BT_CONNECT:
 219         case BT_CONNECT2:
 220         case BT_CONFIG:
 221         case BT_CONNECTED:
 222                 rfcomm_dlc_close(d, 0);
 223
 224         default:
 225                 sock_set_flag(sk, SOCK_ZAPPED);
 226                 break;
 227         }
 228 }
 229
 230 /* Close socket.
 231  * Must be called on unlocked socket.
 232  */
 233 static void rfcomm_sock_close(struct sock *sk)
 234 {
 235         lock_sock(sk);
 236         __rfcomm_sock_close(sk);
 237         release_sock(sk);
 238 }
 239
 240 static void rfcomm_sock_init(struct sock *sk, struct sock *parent)
 241 {
 242         struct rfcomm_pinfo *pi = rfcomm_pi(sk);
 243
 244         BT_DBG("sk %p", sk);
 245
 246         if (parent) {
 247                 sk->sk_type = parent->sk_type;
 248                 pi->dlc->defer_setup = test_bit(BT_SK_DEFER_SETUP,
 249                                                 &bt_sk(parent)->flags);
 250
 251                 pi->sec_level = rfcomm_pi(parent)->sec_level;
 252                 pi->role_switch = rfcomm_pi(parent)->role_switch;
 253
 254                 security_sk_clone(parent, sk);
 255         } else {
 256                 pi->dlc->defer_setup = 0;
 257
 258                 pi->sec_level = BT_SECURITY_LOW;
 259                 pi->role_switch = 0;
 260         }
 261
 262         pi->dlc->sec_level = pi->sec_level;
 263         pi->dlc->role_switch = pi->role_switch;
 264 }
 265
 266 static struct proto rfcomm_proto = {
 267         .name           = "RFCOMM",
 268         .owner          = THIS_MODULE,
 269         .obj_size       = sizeof(struct rfcomm_pinfo)
 270 };
 271
 272 static struct sock *rfcomm_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio, int kern)
 273 {
 274         struct rfcomm_dlc *d;
 275         struct sock *sk;
 276
 277         sk = sk_alloc(net, PF_BLUETOOTH, prio, &rfcomm_proto, kern);
 278         if (!sk)
 279                 return NULL;
 280
 281         sock_init_data(sock, sk);
 282         INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
 283
 284         d = rfcomm_dlc_alloc(prio);
 285         if (!d) {
 286                 sk_free(sk);
 287                 return NULL;
 288         }
 289
 290         d->data_ready   = rfcomm_sk_data_ready;
 291         d->state_change = rfcomm_sk_state_change;
 292
 293         rfcomm_pi(sk)->dlc = d;
 294         d->owner = sk;
 295
 296         sk->sk_destruct = rfcomm_sock_destruct;
 297         sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT;
 298
 299         sk->sk_sndbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
 300         sk->sk_rcvbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
 301
 302         sock_reset_flag(sk, SOCK_ZAPPED);
 303
 304         sk->sk_protocol = proto;
 305         sk->sk_state    = BT_OPEN;
 306
 307         bt_sock_link(&rfcomm_sk_list, sk);
 308
 309         BT_DBG("sk %p", sk);
 310         return sk;
 311 }
 312
 313 static int rfcomm_sock_create(struct net *net, struct socket *sock,
 314                               int protocol, int kern)
 315 {
 316         struct sock *sk;
 317
 318         BT_DBG("sock %p", sock);
 319
 320         sock->state = SS_UNCONNECTED;
 321
 322         if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW)
 323                 return -ESOCKTNOSUPPORT;
 324
 325         sock->ops = &rfcomm_sock_ops;
 326
 327         sk = rfcomm_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
 328         if (!sk)
 329                 return -ENOMEM;
 330
 331         rfcomm_sock_init(sk, NULL);
 332         return 0;
 333 }
 334
 335 static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 336 {
 337         struct sockaddr_rc sa;
 338         struct sock *sk = sock->sk;
 339         int len, err = 0;
 340
 341         if (!addr || addr->sa_family != AF_BLUETOOTH)
 342                 return -EINVAL;
 343
 344         memset(&sa, 0, sizeof(sa));
 345         len = min_t(unsigned int, sizeof(sa), addr_len);
 346         memcpy(&sa, addr, len);
 347
 348         BT_DBG("sk %p %pMR", sk, &sa.rc_bdaddr);
 349
 350         lock_sock(sk);
 351
 352         if (sk->sk_state != BT_OPEN) {
 353                 err = -EBADFD;
 354                 goto done;
 355         }
 356
 357         if (sk->sk_type != SOCK_STREAM) {
 358                 err = -EINVAL;
 359                 goto done;
 360         }
 361
 362         write_lock(&rfcomm_sk_list.lock);
 363
 364         if (sa.rc_channel &&
 365             __rfcomm_get_listen_sock_by_addr(sa.rc_channel, &sa.rc_bdaddr)) {
 366                 err = -EADDRINUSE;
 367         } else {
 368                 /* Save source address */
 369                 bacpy(&rfcomm_pi(sk)->src, &sa.rc_bdaddr);
 370                 rfcomm_pi(sk)->channel = sa.rc_channel;
 371                 sk->sk_state = BT_BOUND;
 372         }
 373
 374         write_unlock(&rfcomm_sk_list.lock);
 375
 376 done:
 377         release_sock(sk);
 378         return err;
 379 }
 380
 381 static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
 382 {
 383         struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
 384         struct sock *sk = sock->sk;
 385         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 386         int err = 0;
 387
 388         BT_DBG("sk %p", sk);
 389
 390         if (alen < sizeof(struct sockaddr_rc) ||
 391             addr->sa_family != AF_BLUETOOTH)
 392                 return -EINVAL;
 393
 394         lock_sock(sk);
 395
 396         if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) {
 397                 err = -EBADFD;
 398                 goto done;
 399         }
 400
 401         if (sk->sk_type != SOCK_STREAM) {
 402                 err = -EINVAL;
 403                 goto done;
 404         }
 405
 406         sk->sk_state = BT_CONNECT;
 407         bacpy(&rfcomm_pi(sk)->dst, &sa->rc_bdaddr);
 408         rfcomm_pi(sk)->channel = sa->rc_channel;
 409
 410         d->sec_level = rfcomm_pi(sk)->sec_level;
 411         d->role_switch = rfcomm_pi(sk)->role_switch;
 412
 413         err = rfcomm_dlc_open(d, &rfcomm_pi(sk)->src, &sa->rc_bdaddr,
 414                               sa->rc_channel);
 415         if (!err)
 416                 err = bt_sock_wait_state(sk, BT_CONNECTED,
 417                                 sock_sndtimeo(sk, flags & O_NONBLOCK));
 418
 419 done:
 420         release_sock(sk);
 421         return err;
 422 }
 423
 424 static int rfcomm_sock_listen(struct socket *sock, int backlog)
 425 {
 426         struct sock *sk = sock->sk;
 427         int err = 0;
 428
 429         BT_DBG("sk %p backlog %d", sk, backlog);
 430
 431         lock_sock(sk);
 432
 433         if (sk->sk_state != BT_BOUND) {
 434                 err = -EBADFD;
 435                 goto done;
 436         }
 437
 438         if (sk->sk_type != SOCK_STREAM) {
 439                 err = -EINVAL;
 440                 goto done;
 441         }
 442
 443         if (!rfcomm_pi(sk)->channel) {
 444                 bdaddr_t *src = &rfcomm_pi(sk)->src;
 445                 u8 channel;
 446
 447                 err = -EINVAL;
 448
 449                 write_lock(&rfcomm_sk_list.lock);
 450
 451                 for (channel = 1; channel < 31; channel++)
 452                         if (!__rfcomm_get_listen_sock_by_addr(channel, src)) {
 453                                 rfcomm_pi(sk)->channel = channel;
 454                                 err = 0;
 455                                 break;
 456                         }
 457
 458                 write_unlock(&rfcomm_sk_list.lock);
 459
 460                 if (err < 0)
 461                         goto done;
 462         }
 463
 464         sk->sk_max_ack_backlog = backlog;
 465         sk->sk_ack_backlog = 0;
 466         sk->sk_state = BT_LISTEN;
 467
 468 done:
 469         release_sock(sk);
 470         return err;
 471 }
 472
 473 static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags)
 474 {
 475         DEFINE_WAIT_FUNC(wait, woken_wake_function);
 476         struct sock *sk = sock->sk, *nsk;
 477         long timeo;
 478         int err = 0;
 479
 480         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 481
 482         if (sk->sk_type != SOCK_STREAM) {
 483                 err = -EINVAL;
 484                 goto done;
 485         }
 486
 487         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 488
 489         BT_DBG("sk %p timeo %ld", sk, timeo);
 490
 491         /* Wait for an incoming connection. (wake-one). */
 492         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 493         while (1) {
 494                 if (sk->sk_state != BT_LISTEN) {
 495                         err = -EBADFD;
 496                         break;
 497                 }
 498
 499                 nsk = bt_accept_dequeue(sk, newsock);
 500                 if (nsk)
 501                         break;
 502
 503                 if (!timeo) {
 504                         err = -EAGAIN;
 505                         break;
 506                 }
 507
 508                 if (signal_pending(current)) {
 509                         err = sock_intr_errno(timeo);
 510                         break;
 511                 }
 512
 513                 release_sock(sk);
 514
 515                 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
 516
 517                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 518         }
 519         remove_wait_queue(sk_sleep(sk), &wait);
 520
 521         if (err)
 522                 goto done;
 523
 524         newsock->state = SS_CONNECTED;
 525
 526         BT_DBG("new socket %p", nsk);
 527
 528 done:
 529         release_sock(sk);
 530         return err;
 531 }
 532
 533 static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
 534 {
 535         struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
 536         struct sock *sk = sock->sk;
 537
 538         BT_DBG("sock %p, sk %p", sock, sk);
 539
 540         if (peer && sk->sk_state != BT_CONNECTED &&
 541             sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2)
 542                 return -ENOTCONN;
 543
 544         memset(sa, 0, sizeof(*sa));
 545         sa->rc_family  = AF_BLUETOOTH;
 546         sa->rc_channel = rfcomm_pi(sk)->channel;
 547         if (peer)
 548                 bacpy(&sa->rc_bdaddr, &rfcomm_pi(sk)->dst);
 549         else
 550                 bacpy(&sa->rc_bdaddr, &rfcomm_pi(sk)->src);
 551
 552         *len = sizeof(struct sockaddr_rc);
 553         return 0;
 554 }
 555
 556 static int rfcomm_sock_sendmsg(struct socket *sock, struct msghdr *msg,
 557                                size_t len)
 558 {
 559         struct sock *sk = sock->sk;
 560         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 561         struct sk_buff *skb;
 562         int sent;
 563
 564         if (test_bit(RFCOMM_DEFER_SETUP, &d->flags))
 565                 return -ENOTCONN;
 566
 567         if (msg->msg_flags & MSG_OOB)
 568                 return -EOPNOTSUPP;
 569
 570         if (sk->sk_shutdown & SEND_SHUTDOWN)
 571                 return -EPIPE;
 572
 573         BT_DBG("sock %p, sk %p", sock, sk);
 574
 575         lock_sock(sk);
 576
 577         sent = bt_sock_wait_ready(sk, msg->msg_flags);
 578         if (sent)
 579                 goto done;
 580
 581         while (len) {
 582                 size_t size = min_t(size_t, len, d->mtu);
 583                 int err;
 584
 585                 skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE,
 586                                 msg->msg_flags & MSG_DONTWAIT, &err);
 587                 if (!skb) {
 588                         if (sent == 0)
 589                                 sent = err;
 590                         break;
 591                 }
 592                 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
 593
 594                 err = memcpy_from_msg(skb_put(skb, size), msg, size);
 595                 if (err) {
 596                         kfree_skb(skb);
 597                         if (sent == 0)
 598                                 sent = err;
 599                         break;
 600                 }
 601
 602                 skb->priority = sk->sk_priority;
 603
 604                 err = rfcomm_dlc_send(d, skb);
 605                 if (err < 0) {
 606                         kfree_skb(skb);
 607                         if (sent == 0)
 608                                 sent = err;
 609                         break;
 610                 }
 611
 612                 sent += size;
 613                 len  -= size;
 614         }
 615
 616 done:
 617         release_sock(sk);
 618
 619         return sent;
 620 }
 621
 622 static int rfcomm_sock_recvmsg(struct socket *sock, struct msghdr *msg,
 623                                size_t size, int flags)
 624 {
 625         struct sock *sk = sock->sk;
 626         struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
 627         int len;
 628
 629         if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
 630                 rfcomm_dlc_accept(d);
 631                 return 0;
 632         }
 633
 634         len = bt_sock_stream_recvmsg(sock, msg, size, flags);
 635
 636         lock_sock(sk);
 637         if (!(flags & MSG_PEEK) && len > 0)
 638                 atomic_sub(len, &sk->sk_rmem_alloc);
 639
 640         if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2))
 641                 rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc);
 642         release_sock(sk);
 643
 644         return len;
 645 }
 646
 647 static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
 648 {
 649         struct sock *sk = sock->sk;
 650         int err = 0;
 651         u32 opt;
 652
 653         BT_DBG("sk %p", sk);
 654
 655         lock_sock(sk);
 656
 657         switch (optname) {
 658         case RFCOMM_LM:
 659                 if (get_user(opt, (u32 __user *) optval)) {
 660                         err = -EFAULT;
 661                         break;
 662                 }
 663
 664                 if (opt & RFCOMM_LM_FIPS) {
 665                         err = -EINVAL;
 666                         break;
 667                 }
 668
 669                 if (opt & RFCOMM_LM_AUTH)
 670                         rfcomm_pi(sk)->sec_level = BT_SECURITY_LOW;
 671                 if (opt & RFCOMM_LM_ENCRYPT)
 672                         rfcomm_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
 673                 if (opt & RFCOMM_LM_SECURE)
 674                         rfcomm_pi(sk)->sec_level = BT_SECURITY_HIGH;
 675
 676                 rfcomm_pi(sk)->role_switch = (opt & RFCOMM_LM_MASTER);
 677                 break;
 678
 679         default:
 680                 err = -ENOPROTOOPT;
 681                 break;
 682         }
 683
 684         release_sock(sk);
 685         return err;
 686 }
 687
 688 static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
 689 {
 690         struct sock *sk = sock->sk;
 691         struct bt_security sec;
 692         int err = 0;
 693         size_t len;
 694         u32 opt;
 695
 696         BT_DBG("sk %p", sk);
 697
 698         if (level == SOL_RFCOMM)
 699                 return rfcomm_sock_setsockopt_old(sock, optname, optval, optlen);
 700
 701         if (level != SOL_BLUETOOTH)
 702                 return -ENOPROTOOPT;
 703
 704         lock_sock(sk);
 705
 706         switch (optname) {
 707         case BT_SECURITY:
 708                 if (sk->sk_type != SOCK_STREAM) {
 709                         err = -EINVAL;
 710                         break;
 711                 }
 712
 713                 sec.level = BT_SECURITY_LOW;
 714
 715                 len = min_t(unsigned int, sizeof(sec), optlen);
 716                 if (copy_from_user((char *) &sec, optval, len)) {
 717                         err = -EFAULT;
 718                         break;
 719                 }
 720
 721                 if (sec.level > BT_SECURITY_HIGH) {
 722                         err = -EINVAL;
 723                         break;
 724                 }
 725
 726                 rfcomm_pi(sk)->sec_level = sec.level;
 727                 break;
 728
 729         case BT_DEFER_SETUP:
 730                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
 731                         err = -EINVAL;
 732                         break;
 733                 }
 734
 735                 if (get_user(opt, (u32 __user *) optval)) {
 736                         err = -EFAULT;
 737                         break;
 738                 }
 739
 740                 if (opt)
 741                         set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
 742                 else
 743                         clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
 744
 745                 break;
 746
 747         default:
 748                 err = -ENOPROTOOPT;
 749                 break;
 750         }
 751
 752         release_sock(sk);
 753         return err;
 754 }
 755
 756 static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
 757 {
 758         struct sock *sk = sock->sk;
 759         struct sock *l2cap_sk;
 760         struct l2cap_conn *conn;
 761         struct rfcomm_conninfo cinfo;
 762         int len, err = 0;
 763         u32 opt;
 764
 765         BT_DBG("sk %p", sk);
 766
 767         if (get_user(len, optlen))
 768                 return -EFAULT;
 769
 770         lock_sock(sk);
 771
 772         switch (optname) {
 773         case RFCOMM_LM:
 774                 switch (rfcomm_pi(sk)->sec_level) {
 775                 case BT_SECURITY_LOW:
 776                         opt = RFCOMM_LM_AUTH;
 777                         break;
 778                 case BT_SECURITY_MEDIUM:
 779                         opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT;
 780                         break;
 781                 case BT_SECURITY_HIGH:
 782                         opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT |
 783                               RFCOMM_LM_SECURE;
 784                         break;
 785                 case BT_SECURITY_FIPS:
 786                         opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT |
 787                               RFCOMM_LM_SECURE | RFCOMM_LM_FIPS;
 788                         break;
 789                 default:
 790                         opt = 0;
 791                         break;
 792                 }
 793
 794                 if (rfcomm_pi(sk)->role_switch)
 795                         opt |= RFCOMM_LM_MASTER;
 796
 797                 if (put_user(opt, (u32 __user *) optval))
 798                         err = -EFAULT;
 799
 800                 break;
 801
 802         case RFCOMM_CONNINFO:
 803                 if (sk->sk_state != BT_CONNECTED &&
 804                                         !rfcomm_pi(sk)->dlc->defer_setup) {
 805                         err = -ENOTCONN;
 806                         break;
 807                 }
 808
 809                 l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk;
 810                 conn = l2cap_pi(l2cap_sk)->chan->conn;
 811
 812                 memset(&cinfo, 0, sizeof(cinfo));
 813                 cinfo.hci_handle = conn->hcon->handle;
 814                 memcpy(cinfo.dev_class, conn->hcon->dev_class, 3);
 815
 816                 len = min_t(unsigned int, len, sizeof(cinfo));
 817                 if (copy_to_user(optval, (char *) &cinfo, len))
 818                         err = -EFAULT;
 819
 820                 break;
 821
 822         default:
 823                 err = -ENOPROTOOPT;
 824                 break;
 825         }
 826
 827         release_sock(sk);
 828         return err;
 829 }
 830
 831 static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
 832 {
 833         struct sock *sk = sock->sk;
 834         struct bt_security sec;
 835         int len, err = 0;
 836
 837         BT_DBG("sk %p", sk);
 838
 839         if (level == SOL_RFCOMM)
 840                 return rfcomm_sock_getsockopt_old(sock, optname, optval, optlen);
 841
 842         if (level != SOL_BLUETOOTH)
 843                 return -ENOPROTOOPT;
 844
 845         if (get_user(len, optlen))
 846                 return -EFAULT;
 847
 848         lock_sock(sk);
 849
 850         switch (optname) {
 851         case BT_SECURITY:
 852                 if (sk->sk_type != SOCK_STREAM) {
 853                         err = -EINVAL;
 854                         break;
 855                 }
 856
 857                 sec.level = rfcomm_pi(sk)->sec_level;
 858                 sec.key_size = 0;
 859
 860                 len = min_t(unsigned int, len, sizeof(sec));
 861                 if (copy_to_user(optval, (char *) &sec, len))
 862                         err = -EFAULT;
 863
 864                 break;
 865
 866         case BT_DEFER_SETUP:
 867                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
 868                         err = -EINVAL;
 869                         break;
 870                 }
 871
 872                 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
 873                              (u32 __user *) optval))
 874                         err = -EFAULT;
 875
 876                 break;
 877
 878         default:
 879                 err = -ENOPROTOOPT;
 880                 break;
 881         }
 882
 883         release_sock(sk);
 884         return err;
 885 }
 886
 887 static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 888 {
 889         struct sock *sk __maybe_unused = sock->sk;
 890         int err;
 891
 892         BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
 893
 894         err = bt_sock_ioctl(sock, cmd, arg);
 895
 896         if (err == -ENOIOCTLCMD) {
 897 #ifdef CONFIG_BT_RFCOMM_TTY
 898                 lock_sock(sk);
 899                 err = rfcomm_dev_ioctl(sk, cmd, (void __user *) arg);
 900                 release_sock(sk);
 901 #else
 902                 err = -EOPNOTSUPP;
 903 #endif
 904         }
 905
 906         return err;
 907 }
 908
 909 static int rfcomm_sock_shutdown(struct socket *sock, int how)
 910 {
 911         struct sock *sk = sock->sk;
 912         int err = 0;
 913
 914         BT_DBG("sock %p, sk %p", sock, sk);
 915
 916         if (!sk)
 917                 return 0;
 918
 919         lock_sock(sk);
 920         if (!sk->sk_shutdown) {
 921                 sk->sk_shutdown = SHUTDOWN_MASK;
 922                 __rfcomm_sock_close(sk);
 923
 924                 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
 925                     !(current->flags & PF_EXITING))
 926                         err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
 927         }
 928         release_sock(sk);
 929         return err;
 930 }
 931
 932 static int rfcomm_sock_release(struct socket *sock)
 933 {
 934         struct sock *sk = sock->sk;
 935         int err;
 936
 937         BT_DBG("sock %p, sk %p", sock, sk);
 938
 939         if (!sk)
 940                 return 0;
 941
 942         err = rfcomm_sock_shutdown(sock, 2);
 943
 944         sock_orphan(sk);
 945         rfcomm_sock_kill(sk);
 946         return err;
 947 }
 948
 949 /* ---- RFCOMM core layer callbacks ----
 950  *
 951  * called under rfcomm_lock()
 952  */
 953 int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d)
 954 {
 955         struct sock *sk, *parent;
 956         bdaddr_t src, dst;
 957         int result = 0;
 958
 959         BT_DBG("session %p channel %d", s, channel);
 960
 961         rfcomm_session_getaddr(s, &src, &dst);
 962
 963         /* Check if we have socket listening on channel */
 964         parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src);
 965         if (!parent)
 966                 return 0;
 967
 968         bh_lock_sock(parent);
 969
 970         /* Check for backlog size */
 971         if (sk_acceptq_is_full(parent)) {
 972                 BT_DBG("backlog full %d", parent->sk_ack_backlog);
 973                 goto done;
 974         }
 975
 976         sk = rfcomm_sock_alloc(sock_net(parent), NULL, BTPROTO_RFCOMM, GFP_ATOMIC, 0);
 977         if (!sk)
 978                 goto done;
 979
 980         bt_sock_reclassify_lock(sk, BTPROTO_RFCOMM);
 981
 982         rfcomm_sock_init(sk, parent);
 983         bacpy(&rfcomm_pi(sk)->src, &src);
 984         bacpy(&rfcomm_pi(sk)->dst, &dst);
 985         rfcomm_pi(sk)->channel = channel;
 986
 987         sk->sk_state = BT_CONFIG;
 988         bt_accept_enqueue(parent, sk);
 989
 990         /* Accept connection and return socket DLC */
 991         *d = rfcomm_pi(sk)->dlc;
 992         result = 1;
 993
 994 done:
 995         bh_unlock_sock(parent);
 996
 997         if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
 998                 parent->sk_state_change(parent);
 999
1000         return result;
1001 }
1002
1003 static int rfcomm_sock_debugfs_show(struct seq_file *f, void *p)
1004 {
1005         struct sock *sk;
1006
1007         read_lock(&rfcomm_sk_list.lock);
1008
1009         sk_for_each(sk, &rfcomm_sk_list.head) {
1010                 seq_printf(f, "%pMR %pMR %d %d\n",
1011                            &rfcomm_pi(sk)->src, &rfcomm_pi(sk)->dst,
1012                            sk->sk_state, rfcomm_pi(sk)->channel);
1013         }
1014
1015         read_unlock(&rfcomm_sk_list.lock);
1016
1017         return 0;
1018 }
1019
1020 static int rfcomm_sock_debugfs_open(struct inode *inode, struct file *file)
1021 {
1022         return single_open(file, rfcomm_sock_debugfs_show, inode->i_private);
1023 }
1024
1025 static const struct file_operations rfcomm_sock_debugfs_fops = {
1026         .open           = rfcomm_sock_debugfs_open,
1027         .read           = seq_read,
1028         .llseek         = seq_lseek,
1029         .release        = single_release,
1030 };
1031
1032 static struct dentry *rfcomm_sock_debugfs;
1033
1034 static const struct proto_ops rfcomm_sock_ops = {
1035         .family         = PF_BLUETOOTH,
1036         .owner          = THIS_MODULE,
1037         .release        = rfcomm_sock_release,
1038         .bind           = rfcomm_sock_bind,
1039         .connect        = rfcomm_sock_connect,
1040         .listen         = rfcomm_sock_listen,
1041         .accept         = rfcomm_sock_accept,
1042         .getname        = rfcomm_sock_getname,
1043         .sendmsg        = rfcomm_sock_sendmsg,
1044         .recvmsg        = rfcomm_sock_recvmsg,
1045         .shutdown       = rfcomm_sock_shutdown,
1046         .setsockopt     = rfcomm_sock_setsockopt,
1047         .getsockopt     = rfcomm_sock_getsockopt,
1048         .ioctl          = rfcomm_sock_ioctl,
1049         .poll           = bt_sock_poll,
1050         .socketpair     = sock_no_socketpair,
1051         .mmap           = sock_no_mmap
1052 };
1053
1054 static const struct net_proto_family rfcomm_sock_family_ops = {
1055         .family         = PF_BLUETOOTH,
1056         .owner          = THIS_MODULE,
1057         .create         = rfcomm_sock_create
1058 };
1059
1060 int __init rfcomm_init_sockets(void)
1061 {
1062         int err;
1063
1064         BUILD_BUG_ON(sizeof(struct sockaddr_rc) > sizeof(struct sockaddr));
1065
1066         err = proto_register(&rfcomm_proto, 0);
1067         if (err < 0)
1068                 return err;
1069
1070         err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops);
1071         if (err < 0) {
1072                 BT_ERR("RFCOMM socket layer registration failed");
1073                 goto error;
1074         }
1075
1076         err = bt_procfs_init(&init_net, "rfcomm", &rfcomm_sk_list, NULL);
1077         if (err < 0) {
1078                 BT_ERR("Failed to create RFCOMM proc file");
1079                 bt_sock_unregister(BTPROTO_RFCOMM);
1080                 goto error;
1081         }
1082
1083         BT_INFO("RFCOMM socket layer initialized");
1084
1085         if (IS_ERR_OR_NULL(bt_debugfs))
1086                 return 0;
1087
1088         rfcomm_sock_debugfs = debugfs_create_file("rfcomm", 0444,
1089                                                   bt_debugfs, NULL,
1090                                                   &rfcomm_sock_debugfs_fops);
1091
1092         return 0;
1093
1094 error:
1095         proto_unregister(&rfcomm_proto);
1096         return err;
1097 }
1098
1099 void __exit rfcomm_cleanup_sockets(void)
1100 {
1101         bt_procfs_cleanup(&init_net, "rfcomm");
1102
1103         debugfs_remove(rfcomm_sock_debugfs);
1104
1105         bt_sock_unregister(BTPROTO_RFCOMM);
1106
1107         proto_unregister(&rfcomm_proto);
1108 }