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