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