net/bluetooth/rfcomm/tty.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 TTY.
  26  */
  27
  28 #include <linux/module.h>
  29
  30 #include <linux/tty.h>
  31 #include <linux/tty_driver.h>
  32 #include <linux/tty_flip.h>
  33
  34 #include <net/bluetooth/bluetooth.h>
  35 #include <net/bluetooth/hci_core.h>
  36 #include <net/bluetooth/rfcomm.h>
  37
  38 #define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */
  39 #define RFCOMM_TTY_MAJOR 216            /* device node major id of the usb/bluetooth.c driver */
  40 #define RFCOMM_TTY_MINOR 0
  41
  42 static DEFINE_MUTEX(rfcomm_ioctl_mutex);
  43 static struct tty_driver *rfcomm_tty_driver;
  44
  45 struct rfcomm_dev {
  46         struct tty_port         port;
  47         struct list_head        list;
  48
  49         char                    name[12];
  50         int                     id;
  51         unsigned long           flags;
  52         int                     err;
  53
  54         unsigned long           status;         /* don't export to userspace */
  55
  56         bdaddr_t                src;
  57         bdaddr_t                dst;
  58         u8                      channel;
  59
  60         uint                    modem_status;
  61
  62         struct rfcomm_dlc       *dlc;
  63
  64         struct device           *tty_dev;
  65
  66         atomic_t                wmem_alloc;
  67
  68         struct sk_buff_head     pending;
  69 };
  70
  71 static LIST_HEAD(rfcomm_dev_list);
  72 static DEFINE_MUTEX(rfcomm_dev_lock);
  73
  74 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
  75 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
  76 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
  77
  78 /* ---- Device functions ---- */
  79
  80 static void rfcomm_dev_destruct(struct tty_port *port)
  81 {
  82         struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
  83         struct rfcomm_dlc *dlc = dev->dlc;
  84
  85         BT_DBG("dev %p dlc %p", dev, dlc);
  86
  87         rfcomm_dlc_lock(dlc);
  88         /* Detach DLC if it's owned by this dev */
  89         if (dlc->owner == dev)
  90                 dlc->owner = NULL;
  91         rfcomm_dlc_unlock(dlc);
  92
  93         rfcomm_dlc_put(dlc);
  94
  95         if (dev->tty_dev)
  96                 tty_unregister_device(rfcomm_tty_driver, dev->id);
  97
  98         mutex_lock(&rfcomm_dev_lock);
  99         list_del(&dev->list);
 100         mutex_unlock(&rfcomm_dev_lock);
 101
 102         kfree(dev);
 103
 104         /* It's safe to call module_put() here because socket still
 105            holds reference to this module. */
 106         module_put(THIS_MODULE);
 107 }
 108
 109 /* device-specific initialization: open the dlc */
 110 static int rfcomm_dev_activate(struct tty_port *port, struct tty_struct *tty)
 111 {
 112         struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
 113         int err;
 114
 115         err = rfcomm_dlc_open(dev->dlc, &dev->src, &dev->dst, dev->channel);
 116         if (err)
 117                 set_bit(TTY_IO_ERROR, &tty->flags);
 118         return err;
 119 }
 120
 121 /* we block the open until the dlc->state becomes BT_CONNECTED */
 122 static bool rfcomm_dev_carrier_raised(struct tty_port *port)
 123 {
 124         struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
 125
 126         return (dev->dlc->state == BT_CONNECTED);
 127 }
 128
 129 /* device-specific cleanup: close the dlc */
 130 static void rfcomm_dev_shutdown(struct tty_port *port)
 131 {
 132         struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
 133
 134         if (dev->tty_dev->parent)
 135                 device_move(dev->tty_dev, NULL, DPM_ORDER_DEV_LAST);
 136
 137         /* close the dlc */
 138         rfcomm_dlc_close(dev->dlc, 0);
 139 }
 140
 141 static const struct tty_port_operations rfcomm_port_ops = {
 142         .destruct = rfcomm_dev_destruct,
 143         .activate = rfcomm_dev_activate,
 144         .shutdown = rfcomm_dev_shutdown,
 145         .carrier_raised = rfcomm_dev_carrier_raised,
 146 };
 147
 148 static struct rfcomm_dev *__rfcomm_dev_lookup(int id)
 149 {
 150         struct rfcomm_dev *dev;
 151
 152         list_for_each_entry(dev, &rfcomm_dev_list, list)
 153                 if (dev->id == id)
 154                         return dev;
 155
 156         return NULL;
 157 }
 158
 159 static struct rfcomm_dev *rfcomm_dev_get(int id)
 160 {
 161         struct rfcomm_dev *dev;
 162
 163         mutex_lock(&rfcomm_dev_lock);
 164
 165         dev = __rfcomm_dev_lookup(id);
 166
 167         if (dev && !tty_port_get(&dev->port))
 168                 dev = NULL;
 169
 170         mutex_unlock(&rfcomm_dev_lock);
 171
 172         return dev;
 173 }
 174
 175 static void rfcomm_reparent_device(struct rfcomm_dev *dev)
 176 {
 177         struct hci_dev *hdev;
 178         struct hci_conn *conn;
 179
 180         hdev = hci_get_route(&dev->dst, &dev->src, BDADDR_BREDR);
 181         if (!hdev)
 182                 return;
 183
 184         /* The lookup results are unsafe to access without the
 185          * hci device lock (FIXME: why is this not documented?)
 186          */
 187         hci_dev_lock(hdev);
 188         conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst);
 189
 190         /* Just because the acl link is in the hash table is no
 191          * guarantee the sysfs device has been added ...
 192          */
 193         if (conn && device_is_registered(&conn->dev))
 194                 device_move(dev->tty_dev, &conn->dev, DPM_ORDER_DEV_AFTER_PARENT);
 195
 196         hci_dev_unlock(hdev);
 197         hci_dev_put(hdev);
 198 }
 199
 200 static ssize_t address_show(struct device *tty_dev,
 201                             struct device_attribute *attr, char *buf)
 202 {
 203         struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
 204         return sprintf(buf, "%pMR\n", &dev->dst);
 205 }
 206
 207 static ssize_t channel_show(struct device *tty_dev,
 208                             struct device_attribute *attr, char *buf)
 209 {
 210         struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
 211         return sprintf(buf, "%d\n", dev->channel);
 212 }
 213
 214 static DEVICE_ATTR_RO(address);
 215 static DEVICE_ATTR_RO(channel);
 216
 217 static struct rfcomm_dev *__rfcomm_dev_add(struct rfcomm_dev_req *req,
 218                                            struct rfcomm_dlc *dlc)
 219 {
 220         struct rfcomm_dev *dev, *entry;
 221         struct list_head *head = &rfcomm_dev_list;
 222         int err = 0;
 223
 224         dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
 225         if (!dev)
 226                 return ERR_PTR(-ENOMEM);
 227
 228         mutex_lock(&rfcomm_dev_lock);
 229
 230         if (req->dev_id < 0) {
 231                 dev->id = 0;
 232
 233                 list_for_each_entry(entry, &rfcomm_dev_list, list) {
 234                         if (entry->id != dev->id)
 235                                 break;
 236
 237                         dev->id++;
 238                         head = &entry->list;
 239                 }
 240         } else {
 241                 dev->id = req->dev_id;
 242
 243                 list_for_each_entry(entry, &rfcomm_dev_list, list) {
 244                         if (entry->id == dev->id) {
 245                                 err = -EADDRINUSE;
 246                                 goto out;
 247                         }
 248
 249                         if (entry->id > dev->id - 1)
 250                                 break;
 251
 252                         head = &entry->list;
 253                 }
 254         }
 255
 256         if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
 257                 err = -ENFILE;
 258                 goto out;
 259         }
 260
 261         sprintf(dev->name, "rfcomm%d", dev->id);
 262
 263         list_add(&dev->list, head);
 264
 265         bacpy(&dev->src, &req->src);
 266         bacpy(&dev->dst, &req->dst);
 267         dev->channel = req->channel;
 268
 269         dev->flags = req->flags &
 270                 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
 271
 272         tty_port_init(&dev->port);
 273         dev->port.ops = &rfcomm_port_ops;
 274
 275         skb_queue_head_init(&dev->pending);
 276
 277         rfcomm_dlc_lock(dlc);
 278
 279         if (req->flags & (1 << RFCOMM_REUSE_DLC)) {
 280                 struct sock *sk = dlc->owner;
 281                 struct sk_buff *skb;
 282
 283                 BUG_ON(!sk);
 284
 285                 rfcomm_dlc_throttle(dlc);
 286
 287                 while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
 288                         skb_orphan(skb);
 289                         skb_queue_tail(&dev->pending, skb);
 290                         atomic_sub(skb->len, &sk->sk_rmem_alloc);
 291                 }
 292         }
 293
 294         dlc->data_ready   = rfcomm_dev_data_ready;
 295         dlc->state_change = rfcomm_dev_state_change;
 296         dlc->modem_status = rfcomm_dev_modem_status;
 297
 298         dlc->owner = dev;
 299         dev->dlc   = dlc;
 300
 301         rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig);
 302
 303         rfcomm_dlc_unlock(dlc);
 304
 305         /* It's safe to call __module_get() here because socket already
 306            holds reference to this module. */
 307         __module_get(THIS_MODULE);
 308
 309         mutex_unlock(&rfcomm_dev_lock);
 310         return dev;
 311
 312 out:
 313         mutex_unlock(&rfcomm_dev_lock);
 314         kfree(dev);
 315         return ERR_PTR(err);
 316 }
 317
 318 static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
 319 {
 320         struct rfcomm_dev *dev;
 321         struct device *tty;
 322
 323         BT_DBG("id %d channel %d", req->dev_id, req->channel);
 324
 325         dev = __rfcomm_dev_add(req, dlc);
 326         if (IS_ERR(dev)) {
 327                 rfcomm_dlc_put(dlc);
 328                 return PTR_ERR(dev);
 329         }
 330
 331         tty = tty_port_register_device(&dev->port, rfcomm_tty_driver,
 332                         dev->id, NULL);
 333         if (IS_ERR(tty)) {
 334                 tty_port_put(&dev->port);
 335                 return PTR_ERR(tty);
 336         }
 337
 338         dev->tty_dev = tty;
 339         rfcomm_reparent_device(dev);
 340         dev_set_drvdata(dev->tty_dev, dev);
 341
 342         if (device_create_file(dev->tty_dev, &dev_attr_address) < 0)
 343                 BT_ERR("Failed to create address attribute");
 344
 345         if (device_create_file(dev->tty_dev, &dev_attr_channel) < 0)
 346                 BT_ERR("Failed to create channel attribute");
 347
 348         return dev->id;
 349 }
 350
 351 /* ---- Send buffer ---- */
 352 static inline unsigned int rfcomm_room(struct rfcomm_dev *dev)
 353 {
 354         struct rfcomm_dlc *dlc = dev->dlc;
 355
 356         /* Limit the outstanding number of packets not yet sent to 40 */
 357         int pending = 40 - atomic_read(&dev->wmem_alloc);
 358
 359         return max(0, pending) * dlc->mtu;
 360 }
 361
 362 static void rfcomm_wfree(struct sk_buff *skb)
 363 {
 364         struct rfcomm_dev *dev = (void *) skb->sk;
 365         atomic_dec(&dev->wmem_alloc);
 366         if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags))
 367                 tty_port_tty_wakeup(&dev->port);
 368         tty_port_put(&dev->port);
 369 }
 370
 371 static void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
 372 {
 373         tty_port_get(&dev->port);
 374         atomic_inc(&dev->wmem_alloc);
 375         skb->sk = (void *) dev;
 376         skb->destructor = rfcomm_wfree;
 377 }
 378
 379 static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority)
 380 {
 381         struct sk_buff *skb = alloc_skb(size, priority);
 382         if (skb)
 383                 rfcomm_set_owner_w(skb, dev);
 384         return skb;
 385 }
 386
 387 /* ---- Device IOCTLs ---- */
 388
 389 #define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
 390
 391 static int __rfcomm_create_dev(struct sock *sk, void __user *arg)
 392 {
 393         struct rfcomm_dev_req req;
 394         struct rfcomm_dlc *dlc;
 395         int id;
 396
 397         if (copy_from_user(&req, arg, sizeof(req)))
 398                 return -EFAULT;
 399
 400         BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags);
 401
 402         if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
 403                 return -EPERM;
 404
 405         if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
 406                 /* Socket must be connected */
 407                 if (sk->sk_state != BT_CONNECTED)
 408                         return -EBADFD;
 409
 410                 dlc = rfcomm_pi(sk)->dlc;
 411                 rfcomm_dlc_hold(dlc);
 412         } else {
 413                 /* Validate the channel is unused */
 414                 dlc = rfcomm_dlc_exists(&req.src, &req.dst, req.channel);
 415                 if (IS_ERR(dlc))
 416                         return PTR_ERR(dlc);
 417                 if (dlc)
 418                         return -EBUSY;
 419                 dlc = rfcomm_dlc_alloc(GFP_KERNEL);
 420                 if (!dlc)
 421                         return -ENOMEM;
 422         }
 423
 424         id = rfcomm_dev_add(&req, dlc);
 425         if (id < 0)
 426                 return id;
 427
 428         if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
 429                 /* DLC is now used by device.
 430                  * Socket must be disconnected */
 431                 sk->sk_state = BT_CLOSED;
 432         }
 433
 434         return id;
 435 }
 436
 437 static int __rfcomm_release_dev(void __user *arg)
 438 {
 439         struct rfcomm_dev_req req;
 440         struct rfcomm_dev *dev;
 441         struct tty_struct *tty;
 442
 443         if (copy_from_user(&req, arg, sizeof(req)))
 444                 return -EFAULT;
 445
 446         BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags);
 447
 448         dev = rfcomm_dev_get(req.dev_id);
 449         if (!dev)
 450                 return -ENODEV;
 451
 452         if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
 453                 tty_port_put(&dev->port);
 454                 return -EPERM;
 455         }
 456
 457         /* only release once */
 458         if (test_and_set_bit(RFCOMM_DEV_RELEASED, &dev->status)) {
 459                 tty_port_put(&dev->port);
 460                 return -EALREADY;
 461         }
 462
 463         if (req.flags & (1 << RFCOMM_HANGUP_NOW))
 464                 rfcomm_dlc_close(dev->dlc, 0);
 465
 466         /* Shut down TTY synchronously before freeing rfcomm_dev */
 467         tty = tty_port_tty_get(&dev->port);
 468         if (tty) {
 469                 tty_vhangup(tty);
 470                 tty_kref_put(tty);
 471         }
 472
 473         if (!test_bit(RFCOMM_TTY_OWNED, &dev->status))
 474                 tty_port_put(&dev->port);
 475
 476         tty_port_put(&dev->port);
 477         return 0;
 478 }
 479
 480 static int rfcomm_create_dev(struct sock *sk, void __user *arg)
 481 {
 482         int ret;
 483
 484         mutex_lock(&rfcomm_ioctl_mutex);
 485         ret = __rfcomm_create_dev(sk, arg);
 486         mutex_unlock(&rfcomm_ioctl_mutex);
 487
 488         return ret;
 489 }
 490
 491 static int rfcomm_release_dev(void __user *arg)
 492 {
 493         int ret;
 494
 495         mutex_lock(&rfcomm_ioctl_mutex);
 496         ret = __rfcomm_release_dev(arg);
 497         mutex_unlock(&rfcomm_ioctl_mutex);
 498
 499         return ret;
 500 }
 501
 502 static int rfcomm_get_dev_list(void __user *arg)
 503 {
 504         struct rfcomm_dev *dev;
 505         struct rfcomm_dev_list_req *dl;
 506         struct rfcomm_dev_info *di;
 507         int n = 0, size, err;
 508         u16 dev_num;
 509
 510         BT_DBG("");
 511
 512         if (get_user(dev_num, (u16 __user *) arg))
 513                 return -EFAULT;
 514
 515         if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
 516                 return -EINVAL;
 517
 518         size = sizeof(*dl) + dev_num * sizeof(*di);
 519
 520         dl = kzalloc(size, GFP_KERNEL);
 521         if (!dl)
 522                 return -ENOMEM;
 523
 524         di = dl->dev_info;
 525
 526         mutex_lock(&rfcomm_dev_lock);
 527
 528         list_for_each_entry(dev, &rfcomm_dev_list, list) {
 529                 if (!tty_port_get(&dev->port))
 530                         continue;
 531                 (di + n)->id      = dev->id;
 532                 (di + n)->flags   = dev->flags;
 533                 (di + n)->state   = dev->dlc->state;
 534                 (di + n)->channel = dev->channel;
 535                 bacpy(&(di + n)->src, &dev->src);
 536                 bacpy(&(di + n)->dst, &dev->dst);
 537                 tty_port_put(&dev->port);
 538                 if (++n >= dev_num)
 539                         break;
 540         }
 541
 542         mutex_unlock(&rfcomm_dev_lock);
 543
 544         dl->dev_num = n;
 545         size = sizeof(*dl) + n * sizeof(*di);
 546
 547         err = copy_to_user(arg, dl, size);
 548         kfree(dl);
 549
 550         return err ? -EFAULT : 0;
 551 }
 552
 553 static int rfcomm_get_dev_info(void __user *arg)
 554 {
 555         struct rfcomm_dev *dev;
 556         struct rfcomm_dev_info di;
 557         int err = 0;
 558
 559         BT_DBG("");
 560
 561         if (copy_from_user(&di, arg, sizeof(di)))
 562                 return -EFAULT;
 563
 564         dev = rfcomm_dev_get(di.id);
 565         if (!dev)
 566                 return -ENODEV;
 567
 568         di.flags   = dev->flags;
 569         di.channel = dev->channel;
 570         di.state   = dev->dlc->state;
 571         bacpy(&di.src, &dev->src);
 572         bacpy(&di.dst, &dev->dst);
 573
 574         if (copy_to_user(arg, &di, sizeof(di)))
 575                 err = -EFAULT;
 576
 577         tty_port_put(&dev->port);
 578         return err;
 579 }
 580
 581 int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
 582 {
 583         BT_DBG("cmd %d arg %p", cmd, arg);
 584
 585         switch (cmd) {
 586         case RFCOMMCREATEDEV:
 587                 return rfcomm_create_dev(sk, arg);
 588
 589         case RFCOMMRELEASEDEV:
 590                 return rfcomm_release_dev(arg);
 591
 592         case RFCOMMGETDEVLIST:
 593                 return rfcomm_get_dev_list(arg);
 594
 595         case RFCOMMGETDEVINFO:
 596                 return rfcomm_get_dev_info(arg);
 597         }
 598
 599         return -EINVAL;
 600 }
 601
 602 /* ---- DLC callbacks ---- */
 603 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
 604 {
 605         struct rfcomm_dev *dev = dlc->owner;
 606
 607         if (!dev) {
 608                 kfree_skb(skb);
 609                 return;
 610         }
 611
 612         if (!skb_queue_empty(&dev->pending)) {
 613                 skb_queue_tail(&dev->pending, skb);
 614                 return;
 615         }
 616
 617         BT_DBG("dlc %p len %d", dlc, skb->len);
 618
 619         tty_insert_flip_string(&dev->port, skb->data, skb->len);
 620         tty_flip_buffer_push(&dev->port);
 621
 622         kfree_skb(skb);
 623 }
 624
 625 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
 626 {
 627         struct rfcomm_dev *dev = dlc->owner;
 628         if (!dev)
 629                 return;
 630
 631         BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
 632
 633         dev->err = err;
 634         if (dlc->state == BT_CONNECTED) {
 635                 rfcomm_reparent_device(dev);
 636
 637                 wake_up_interruptible(&dev->port.open_wait);
 638         } else if (dlc->state == BT_CLOSED)
 639                 tty_port_tty_hangup(&dev->port, false);
 640 }
 641
 642 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
 643 {
 644         struct rfcomm_dev *dev = dlc->owner;
 645         if (!dev)
 646                 return;
 647
 648         BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
 649
 650         if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV))
 651                 tty_port_tty_hangup(&dev->port, true);
 652
 653         dev->modem_status =
 654                 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
 655                 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
 656                 ((v24_sig & RFCOMM_V24_IC)  ? TIOCM_RI : 0) |
 657                 ((v24_sig & RFCOMM_V24_DV)  ? TIOCM_CD : 0);
 658 }
 659
 660 /* ---- TTY functions ---- */
 661 static void rfcomm_tty_copy_pending(struct rfcomm_dev *dev)
 662 {
 663         struct sk_buff *skb;
 664         int inserted = 0;
 665
 666         BT_DBG("dev %p", dev);
 667
 668         rfcomm_dlc_lock(dev->dlc);
 669
 670         while ((skb = skb_dequeue(&dev->pending))) {
 671                 inserted += tty_insert_flip_string(&dev->port, skb->data,
 672                                 skb->len);
 673                 kfree_skb(skb);
 674         }
 675
 676         rfcomm_dlc_unlock(dev->dlc);
 677
 678         if (inserted > 0)
 679                 tty_flip_buffer_push(&dev->port);
 680 }
 681
 682 /* do the reverse of install, clearing the tty fields and releasing the
 683  * reference to tty_port
 684  */
 685 static void rfcomm_tty_cleanup(struct tty_struct *tty)
 686 {
 687         struct rfcomm_dev *dev = tty->driver_data;
 688
 689         clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
 690
 691         rfcomm_dlc_lock(dev->dlc);
 692         tty->driver_data = NULL;
 693         rfcomm_dlc_unlock(dev->dlc);
 694
 695         /*
 696          * purge the dlc->tx_queue to avoid circular dependencies
 697          * between dev and dlc
 698          */
 699         skb_queue_purge(&dev->dlc->tx_queue);
 700
 701         tty_port_put(&dev->port);
 702 }
 703
 704 /* we acquire the tty_port reference since it's here the tty is first used
 705  * by setting the termios. We also populate the driver_data field and install
 706  * the tty port
 707  */
 708 static int rfcomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 709 {
 710         struct rfcomm_dev *dev;
 711         struct rfcomm_dlc *dlc;
 712         int err;
 713
 714         dev = rfcomm_dev_get(tty->index);
 715         if (!dev)
 716                 return -ENODEV;
 717
 718         dlc = dev->dlc;
 719
 720         /* Attach TTY and open DLC */
 721         rfcomm_dlc_lock(dlc);
 722         tty->driver_data = dev;
 723         rfcomm_dlc_unlock(dlc);
 724         set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
 725
 726         /* install the tty_port */
 727         err = tty_port_install(&dev->port, driver, tty);
 728         if (err) {
 729                 rfcomm_tty_cleanup(tty);
 730                 return err;
 731         }
 732
 733         /* take over the tty_port reference if the port was created with the
 734          * flag RFCOMM_RELEASE_ONHUP. This will force the release of the port
 735          * when the last process closes the tty. The behaviour is expected by
 736          * userspace.
 737          */
 738         if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
 739                 set_bit(RFCOMM_TTY_OWNED, &dev->status);
 740                 tty_port_put(&dev->port);
 741         }
 742
 743         return 0;
 744 }
 745
 746 static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
 747 {
 748         struct rfcomm_dev *dev = tty->driver_data;
 749         int err;
 750
 751         BT_DBG("tty %p id %d", tty, tty->index);
 752
 753         BT_DBG("dev %p dst %pMR channel %d opened %d", dev, &dev->dst,
 754                dev->channel, dev->port.count);
 755
 756         err = tty_port_open(&dev->port, tty, filp);
 757         if (err)
 758                 return err;
 759
 760         /*
 761          * FIXME: rfcomm should use proper flow control for
 762          * received data. This hack will be unnecessary and can
 763          * be removed when that's implemented
 764          */
 765         rfcomm_tty_copy_pending(dev);
 766
 767         rfcomm_dlc_unthrottle(dev->dlc);
 768
 769         return 0;
 770 }
 771
 772 static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
 773 {
 774         struct rfcomm_dev *dev = tty->driver_data;
 775
 776         BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc,
 777                                                 dev->port.count);
 778
 779         tty_port_close(&dev->port, tty, filp);
 780 }
 781
 782 static ssize_t rfcomm_tty_write(struct tty_struct *tty, const u8 *buf,
 783                                 size_t count)
 784 {
 785         struct rfcomm_dev *dev = tty->driver_data;
 786         struct rfcomm_dlc *dlc = dev->dlc;
 787         struct sk_buff *skb;
 788         size_t sent = 0, size;
 789
 790         BT_DBG("tty %p count %zu", tty, count);
 791
 792         while (count) {
 793                 size = min_t(size_t, count, dlc->mtu);
 794
 795                 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
 796                 if (!skb)
 797                         break;
 798
 799                 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
 800
 801                 skb_put_data(skb, buf + sent, size);
 802
 803                 rfcomm_dlc_send_noerror(dlc, skb);
 804
 805                 sent  += size;
 806                 count -= size;
 807         }
 808
 809         return sent;
 810 }
 811
 812 static unsigned int rfcomm_tty_write_room(struct tty_struct *tty)
 813 {
 814         struct rfcomm_dev *dev = tty->driver_data;
 815         int room = 0;
 816
 817         if (dev && dev->dlc)
 818                 room = rfcomm_room(dev);
 819
 820         BT_DBG("tty %p room %d", tty, room);
 821
 822         return room;
 823 }
 824
 825 static int rfcomm_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
 826 {
 827         BT_DBG("tty %p cmd 0x%02x", tty, cmd);
 828
 829         switch (cmd) {
 830         case TCGETS:
 831                 BT_DBG("TCGETS is not supported");
 832                 return -ENOIOCTLCMD;
 833
 834         case TCSETS:
 835                 BT_DBG("TCSETS is not supported");
 836                 return -ENOIOCTLCMD;
 837
 838         case TIOCMIWAIT:
 839                 BT_DBG("TIOCMIWAIT");
 840                 break;
 841
 842         case TIOCSERGETLSR:
 843                 BT_ERR("TIOCSERGETLSR is not supported");
 844                 return -ENOIOCTLCMD;
 845
 846         case TIOCSERCONFIG:
 847                 BT_ERR("TIOCSERCONFIG is not supported");
 848                 return -ENOIOCTLCMD;
 849
 850         default:
 851                 return -ENOIOCTLCMD;    /* ioctls which we must ignore */
 852
 853         }
 854
 855         return -ENOIOCTLCMD;
 856 }
 857
 858 static void rfcomm_tty_set_termios(struct tty_struct *tty,
 859                                    const struct ktermios *old)
 860 {
 861         struct ktermios *new = &tty->termios;
 862         int old_baud_rate = tty_termios_baud_rate(old);
 863         int new_baud_rate = tty_termios_baud_rate(new);
 864
 865         u8 baud, data_bits, stop_bits, parity, x_on, x_off;
 866         u16 changes = 0;
 867
 868         struct rfcomm_dev *dev = tty->driver_data;
 869
 870         BT_DBG("tty %p termios %p", tty, old);
 871
 872         if (!dev || !dev->dlc || !dev->dlc->session)
 873                 return;
 874
 875         /* Handle turning off CRTSCTS */
 876         if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
 877                 BT_DBG("Turning off CRTSCTS unsupported");
 878
 879         /* Parity on/off and when on, odd/even */
 880         if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
 881                         ((old->c_cflag & PARODD) != (new->c_cflag & PARODD))) {
 882                 changes |= RFCOMM_RPN_PM_PARITY;
 883                 BT_DBG("Parity change detected.");
 884         }
 885
 886         /* Mark and space parity are not supported! */
 887         if (new->c_cflag & PARENB) {
 888                 if (new->c_cflag & PARODD) {
 889                         BT_DBG("Parity is ODD");
 890                         parity = RFCOMM_RPN_PARITY_ODD;
 891                 } else {
 892                         BT_DBG("Parity is EVEN");
 893                         parity = RFCOMM_RPN_PARITY_EVEN;
 894                 }
 895         } else {
 896                 BT_DBG("Parity is OFF");
 897                 parity = RFCOMM_RPN_PARITY_NONE;
 898         }
 899
 900         /* Setting the x_on / x_off characters */
 901         if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
 902                 BT_DBG("XOFF custom");
 903                 x_on = new->c_cc[VSTOP];
 904                 changes |= RFCOMM_RPN_PM_XON;
 905         } else {
 906                 BT_DBG("XOFF default");
 907                 x_on = RFCOMM_RPN_XON_CHAR;
 908         }
 909
 910         if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
 911                 BT_DBG("XON custom");
 912                 x_off = new->c_cc[VSTART];
 913                 changes |= RFCOMM_RPN_PM_XOFF;
 914         } else {
 915                 BT_DBG("XON default");
 916                 x_off = RFCOMM_RPN_XOFF_CHAR;
 917         }
 918
 919         /* Handle setting of stop bits */
 920         if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
 921                 changes |= RFCOMM_RPN_PM_STOP;
 922
 923         /* POSIX does not support 1.5 stop bits and RFCOMM does not
 924          * support 2 stop bits. So a request for 2 stop bits gets
 925          * translated to 1.5 stop bits */
 926         if (new->c_cflag & CSTOPB)
 927                 stop_bits = RFCOMM_RPN_STOP_15;
 928         else
 929                 stop_bits = RFCOMM_RPN_STOP_1;
 930
 931         /* Handle number of data bits [5-8] */
 932         if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
 933                 changes |= RFCOMM_RPN_PM_DATA;
 934
 935         switch (new->c_cflag & CSIZE) {
 936         case CS5:
 937                 data_bits = RFCOMM_RPN_DATA_5;
 938                 break;
 939         case CS6:
 940                 data_bits = RFCOMM_RPN_DATA_6;
 941                 break;
 942         case CS7:
 943                 data_bits = RFCOMM_RPN_DATA_7;
 944                 break;
 945         case CS8:
 946                 data_bits = RFCOMM_RPN_DATA_8;
 947                 break;
 948         default:
 949                 data_bits = RFCOMM_RPN_DATA_8;
 950                 break;
 951         }
 952
 953         /* Handle baudrate settings */
 954         if (old_baud_rate != new_baud_rate)
 955                 changes |= RFCOMM_RPN_PM_BITRATE;
 956
 957         switch (new_baud_rate) {
 958         case 2400:
 959                 baud = RFCOMM_RPN_BR_2400;
 960                 break;
 961         case 4800:
 962                 baud = RFCOMM_RPN_BR_4800;
 963                 break;
 964         case 7200:
 965                 baud = RFCOMM_RPN_BR_7200;
 966                 break;
 967         case 9600:
 968                 baud = RFCOMM_RPN_BR_9600;
 969                 break;
 970         case 19200:
 971                 baud = RFCOMM_RPN_BR_19200;
 972                 break;
 973         case 38400:
 974                 baud = RFCOMM_RPN_BR_38400;
 975                 break;
 976         case 57600:
 977                 baud = RFCOMM_RPN_BR_57600;
 978                 break;
 979         case 115200:
 980                 baud = RFCOMM_RPN_BR_115200;
 981                 break;
 982         case 230400:
 983                 baud = RFCOMM_RPN_BR_230400;
 984                 break;
 985         default:
 986                 /* 9600 is standard accordinag to the RFCOMM specification */
 987                 baud = RFCOMM_RPN_BR_9600;
 988                 break;
 989
 990         }
 991
 992         if (changes)
 993                 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
 994                                 data_bits, stop_bits, parity,
 995                                 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
 996 }
 997
 998 static void rfcomm_tty_throttle(struct tty_struct *tty)
 999 {
1000         struct rfcomm_dev *dev = tty->driver_data;
1001
1002         BT_DBG("tty %p dev %p", tty, dev);
1003
1004         rfcomm_dlc_throttle(dev->dlc);
1005 }
1006
1007 static void rfcomm_tty_unthrottle(struct tty_struct *tty)
1008 {
1009         struct rfcomm_dev *dev = tty->driver_data;
1010
1011         BT_DBG("tty %p dev %p", tty, dev);
1012
1013         rfcomm_dlc_unthrottle(dev->dlc);
1014 }
1015
1016 static unsigned int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
1017 {
1018         struct rfcomm_dev *dev = tty->driver_data;
1019
1020         BT_DBG("tty %p dev %p", tty, dev);
1021
1022         if (!dev || !dev->dlc)
1023                 return 0;
1024
1025         if (!skb_queue_empty(&dev->dlc->tx_queue))
1026                 return dev->dlc->mtu;
1027
1028         return 0;
1029 }
1030
1031 static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
1032 {
1033         struct rfcomm_dev *dev = tty->driver_data;
1034
1035         BT_DBG("tty %p dev %p", tty, dev);
1036
1037         if (!dev || !dev->dlc)
1038                 return;
1039
1040         skb_queue_purge(&dev->dlc->tx_queue);
1041         tty_wakeup(tty);
1042 }
1043
1044 static void rfcomm_tty_send_xchar(struct tty_struct *tty, u8 ch)
1045 {
1046         BT_DBG("tty %p ch %c", tty, ch);
1047 }
1048
1049 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
1050 {
1051         BT_DBG("tty %p timeout %d", tty, timeout);
1052 }
1053
1054 static void rfcomm_tty_hangup(struct tty_struct *tty)
1055 {
1056         struct rfcomm_dev *dev = tty->driver_data;
1057
1058         BT_DBG("tty %p dev %p", tty, dev);
1059
1060         tty_port_hangup(&dev->port);
1061 }
1062
1063 static int rfcomm_tty_tiocmget(struct tty_struct *tty)
1064 {
1065         struct rfcomm_dev *dev = tty->driver_data;
1066
1067         BT_DBG("tty %p dev %p", tty, dev);
1068
1069         return dev->modem_status;
1070 }
1071
1072 static int rfcomm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
1073 {
1074         struct rfcomm_dev *dev = tty->driver_data;
1075         struct rfcomm_dlc *dlc = dev->dlc;
1076         u8 v24_sig;
1077
1078         BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
1079
1080         rfcomm_dlc_get_modem_status(dlc, &v24_sig);
1081
1082         if (set & TIOCM_DSR || set & TIOCM_DTR)
1083                 v24_sig |= RFCOMM_V24_RTC;
1084         if (set & TIOCM_RTS || set & TIOCM_CTS)
1085                 v24_sig |= RFCOMM_V24_RTR;
1086         if (set & TIOCM_RI)
1087                 v24_sig |= RFCOMM_V24_IC;
1088         if (set & TIOCM_CD)
1089                 v24_sig |= RFCOMM_V24_DV;
1090
1091         if (clear & TIOCM_DSR || clear & TIOCM_DTR)
1092                 v24_sig &= ~RFCOMM_V24_RTC;
1093         if (clear & TIOCM_RTS || clear & TIOCM_CTS)
1094                 v24_sig &= ~RFCOMM_V24_RTR;
1095         if (clear & TIOCM_RI)
1096                 v24_sig &= ~RFCOMM_V24_IC;
1097         if (clear & TIOCM_CD)
1098                 v24_sig &= ~RFCOMM_V24_DV;
1099
1100         rfcomm_dlc_set_modem_status(dlc, v24_sig);
1101
1102         return 0;
1103 }
1104
1105 /* ---- TTY structure ---- */
1106
1107 static const struct tty_operations rfcomm_ops = {
1108         .open                   = rfcomm_tty_open,
1109         .close                  = rfcomm_tty_close,
1110         .write                  = rfcomm_tty_write,
1111         .write_room             = rfcomm_tty_write_room,
1112         .chars_in_buffer        = rfcomm_tty_chars_in_buffer,
1113         .flush_buffer           = rfcomm_tty_flush_buffer,
1114         .ioctl                  = rfcomm_tty_ioctl,
1115         .throttle               = rfcomm_tty_throttle,
1116         .unthrottle             = rfcomm_tty_unthrottle,
1117         .set_termios            = rfcomm_tty_set_termios,
1118         .send_xchar             = rfcomm_tty_send_xchar,
1119         .hangup                 = rfcomm_tty_hangup,
1120         .wait_until_sent        = rfcomm_tty_wait_until_sent,
1121         .tiocmget               = rfcomm_tty_tiocmget,
1122         .tiocmset               = rfcomm_tty_tiocmset,
1123         .install                = rfcomm_tty_install,
1124         .cleanup                = rfcomm_tty_cleanup,
1125 };
1126
1127 int __init rfcomm_init_ttys(void)
1128 {
1129         int error;
1130
1131         rfcomm_tty_driver = tty_alloc_driver(RFCOMM_TTY_PORTS,
1132                         TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV);
1133         if (IS_ERR(rfcomm_tty_driver))
1134                 return PTR_ERR(rfcomm_tty_driver);
1135
1136         rfcomm_tty_driver->driver_name  = "rfcomm";
1137         rfcomm_tty_driver->name         = "rfcomm";
1138         rfcomm_tty_driver->major        = RFCOMM_TTY_MAJOR;
1139         rfcomm_tty_driver->minor_start  = RFCOMM_TTY_MINOR;
1140         rfcomm_tty_driver->type         = TTY_DRIVER_TYPE_SERIAL;
1141         rfcomm_tty_driver->subtype      = SERIAL_TYPE_NORMAL;
1142         rfcomm_tty_driver->init_termios = tty_std_termios;
1143         rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
1144         rfcomm_tty_driver->init_termios.c_lflag &= ~ICANON;
1145         tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
1146
1147         error = tty_register_driver(rfcomm_tty_driver);
1148         if (error) {
1149                 BT_ERR("Can't register RFCOMM TTY driver");
1150                 tty_driver_kref_put(rfcomm_tty_driver);
1151                 return error;
1152         }
1153
1154         BT_INFO("RFCOMM TTY layer initialized");
1155
1156         return 0;
1157 }
1158
1159 void rfcomm_cleanup_ttys(void)
1160 {
1161         tty_unregister_driver(rfcomm_tty_driver);
1162         tty_driver_kref_put(rfcomm_tty_driver);
1163 }