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_MAGIC 0x6d02 /* magic number for rfcomm struct */ 39 #define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */ 40 #define RFCOMM_TTY_MAJOR 216 /* device node major id of the usb/bluetooth.c driver */ 41 #define RFCOMM_TTY_MINOR 0 42 43 static DEFINE_MUTEX(rfcomm_ioctl_mutex); 44 static struct tty_driver *rfcomm_tty_driver; 45 46 struct rfcomm_dev { 47 struct tty_port port; 48 struct list_head list; 49 50 char name[12]; 51 int id; 52 unsigned long flags; 53 int err; 54 55 unsigned long status; /* don't export to userspace */ 56 57 bdaddr_t src; 58 bdaddr_t dst; 59 u8 channel; 60 61 uint modem_status; 62 63 struct rfcomm_dlc *dlc; 64 65 struct device *tty_dev; 66 67 atomic_t wmem_alloc; 68 69 struct sk_buff_head pending; 70 }; 71 72 static LIST_HEAD(rfcomm_dev_list); 73 static DEFINE_MUTEX(rfcomm_dev_lock); 74 75 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb); 76 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err); 77 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig); 78 79 /* ---- Device functions ---- */ 80 81 static void rfcomm_dev_destruct(struct tty_port *port) 82 { 83 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port); 84 struct rfcomm_dlc *dlc = dev->dlc; 85 86 BT_DBG("dev %p dlc %p", dev, dlc); 87 88 rfcomm_dlc_lock(dlc); 89 /* Detach DLC if it's owned by this dev */ 90 if (dlc->owner == dev) 91 dlc->owner = NULL; 92 rfcomm_dlc_unlock(dlc); 93 94 rfcomm_dlc_put(dlc); 95 96 if (dev->tty_dev) 97 tty_unregister_device(rfcomm_tty_driver, dev->id); 98 99 mutex_lock(&rfcomm_dev_lock); 100 list_del(&dev->list); 101 mutex_unlock(&rfcomm_dev_lock); 102 103 kfree(dev); 104 105 /* It's safe to call module_put() here because socket still 106 holds reference to this module. */ 107 module_put(THIS_MODULE); 108 } 109 110 /* device-specific initialization: open the dlc */ 111 static int rfcomm_dev_activate(struct tty_port *port, struct tty_struct *tty) 112 { 113 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port); 114 int err; 115 116 err = rfcomm_dlc_open(dev->dlc, &dev->src, &dev->dst, dev->channel); 117 if (err) 118 set_bit(TTY_IO_ERROR, &tty->flags); 119 return err; 120 } 121 122 /* we block the open until the dlc->state becomes BT_CONNECTED */ 123 static int rfcomm_dev_carrier_raised(struct tty_port *port) 124 { 125 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port); 126 127 return (dev->dlc->state == BT_CONNECTED); 128 } 129 130 /* device-specific cleanup: close the dlc */ 131 static void rfcomm_dev_shutdown(struct tty_port *port) 132 { 133 struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port); 134 135 if (dev->tty_dev->parent) 136 device_move(dev->tty_dev, NULL, DPM_ORDER_DEV_LAST); 137 138 /* close the dlc */ 139 rfcomm_dlc_close(dev->dlc, 0); 140 } 141 142 static const struct tty_port_operations rfcomm_port_ops = { 143 .destruct = rfcomm_dev_destruct, 144 .activate = rfcomm_dev_activate, 145 .shutdown = rfcomm_dev_shutdown, 146 .carrier_raised = rfcomm_dev_carrier_raised, 147 }; 148 149 static struct rfcomm_dev *__rfcomm_dev_lookup(int id) 150 { 151 struct rfcomm_dev *dev; 152 153 list_for_each_entry(dev, &rfcomm_dev_list, list) 154 if (dev->id == id) 155 return dev; 156 157 return NULL; 158 } 159 160 static struct rfcomm_dev *rfcomm_dev_get(int id) 161 { 162 struct rfcomm_dev *dev; 163 164 mutex_lock(&rfcomm_dev_lock); 165 166 dev = __rfcomm_dev_lookup(id); 167 168 if (dev && !tty_port_get(&dev->port)) 169 dev = NULL; 170 171 mutex_unlock(&rfcomm_dev_lock); 172 173 return dev; 174 } 175 176 static void rfcomm_reparent_device(struct rfcomm_dev *dev) 177 { 178 struct hci_dev *hdev; 179 struct hci_conn *conn; 180 181 hdev = hci_get_route(&dev->dst, &dev->src); 182 if (!hdev) 183 return; 184 185 /* The lookup results are unsafe to access without the 186 * hci device lock (FIXME: why is this not documented?) 187 */ 188 hci_dev_lock(hdev); 189 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst); 190 191 /* Just because the acl link is in the hash table is no 192 * guarantee the sysfs device has been added ... 193 */ 194 if (conn && device_is_registered(&conn->dev)) 195 device_move(dev->tty_dev, &conn->dev, DPM_ORDER_DEV_AFTER_PARENT); 196 197 hci_dev_unlock(hdev); 198 hci_dev_put(hdev); 199 } 200 201 static ssize_t show_address(struct device *tty_dev, 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 show_channel(struct device *tty_dev, struct device_attribute *attr, char *buf) 208 { 209 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev); 210 return sprintf(buf, "%d\n", dev->channel); 211 } 212 213 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL); 214 static DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL); 215 216 static struct rfcomm_dev *__rfcomm_dev_add(struct rfcomm_dev_req *req, 217 struct rfcomm_dlc *dlc) 218 { 219 struct rfcomm_dev *dev, *entry; 220 struct list_head *head = &rfcomm_dev_list; 221 int err = 0; 222 223 dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL); 224 if (!dev) 225 return ERR_PTR(-ENOMEM); 226 227 mutex_lock(&rfcomm_dev_lock); 228 229 if (req->dev_id < 0) { 230 dev->id = 0; 231 232 list_for_each_entry(entry, &rfcomm_dev_list, list) { 233 if (entry->id != dev->id) 234 break; 235 236 dev->id++; 237 head = &entry->list; 238 } 239 } else { 240 dev->id = req->dev_id; 241 242 list_for_each_entry(entry, &rfcomm_dev_list, list) { 243 if (entry->id == dev->id) { 244 err = -EADDRINUSE; 245 goto out; 246 } 247 248 if (entry->id > dev->id - 1) 249 break; 250 251 head = &entry->list; 252 } 253 } 254 255 if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) { 256 err = -ENFILE; 257 goto out; 258 } 259 260 sprintf(dev->name, "rfcomm%d", dev->id); 261 262 list_add(&dev->list, head); 263 264 bacpy(&dev->src, &req->src); 265 bacpy(&dev->dst, &req->dst); 266 dev->channel = req->channel; 267 268 dev->flags = req->flags & 269 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC)); 270 271 tty_port_init(&dev->port); 272 dev->port.ops = &rfcomm_port_ops; 273 274 skb_queue_head_init(&dev->pending); 275 276 rfcomm_dlc_lock(dlc); 277 278 if (req->flags & (1 << RFCOMM_REUSE_DLC)) { 279 struct sock *sk = dlc->owner; 280 struct sk_buff *skb; 281 282 BUG_ON(!sk); 283 284 rfcomm_dlc_throttle(dlc); 285 286 while ((skb = skb_dequeue(&sk->sk_receive_queue))) { 287 skb_orphan(skb); 288 skb_queue_tail(&dev->pending, skb); 289 atomic_sub(skb->len, &sk->sk_rmem_alloc); 290 } 291 } 292 293 dlc->data_ready = rfcomm_dev_data_ready; 294 dlc->state_change = rfcomm_dev_state_change; 295 dlc->modem_status = rfcomm_dev_modem_status; 296 297 dlc->owner = dev; 298 dev->dlc = dlc; 299 300 rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig); 301 302 rfcomm_dlc_unlock(dlc); 303 304 /* It's safe to call __module_get() here because socket already 305 holds reference to this module. */ 306 __module_get(THIS_MODULE); 307 308 mutex_unlock(&rfcomm_dev_lock); 309 return dev; 310 311 out: 312 mutex_unlock(&rfcomm_dev_lock); 313 kfree(dev); 314 return ERR_PTR(err); 315 } 316 317 static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc) 318 { 319 struct rfcomm_dev *dev; 320 struct device *tty; 321 322 BT_DBG("id %d channel %d", req->dev_id, req->channel); 323 324 dev = __rfcomm_dev_add(req, dlc); 325 if (IS_ERR(dev)) { 326 rfcomm_dlc_put(dlc); 327 return PTR_ERR(dev); 328 } 329 330 tty = tty_port_register_device(&dev->port, rfcomm_tty_driver, 331 dev->id, NULL); 332 if (IS_ERR(tty)) { 333 tty_port_put(&dev->port); 334 return PTR_ERR(tty); 335 } 336 337 dev->tty_dev = tty; 338 rfcomm_reparent_device(dev); 339 dev_set_drvdata(dev->tty_dev, dev); 340 341 if (device_create_file(dev->tty_dev, &dev_attr_address) < 0) 342 BT_ERR("Failed to create address attribute"); 343 344 if (device_create_file(dev->tty_dev, &dev_attr_channel) < 0) 345 BT_ERR("Failed to create channel attribute"); 346 347 return dev->id; 348 } 349 350 /* ---- Send buffer ---- */ 351 static inline unsigned int rfcomm_room(struct rfcomm_dev *dev) 352 { 353 struct rfcomm_dlc *dlc = dev->dlc; 354 355 /* Limit the outstanding number of packets not yet sent to 40 */ 356 int pending = 40 - atomic_read(&dev->wmem_alloc); 357 358 return max(0, pending) * dlc->mtu; 359 } 360 361 static void rfcomm_wfree(struct sk_buff *skb) 362 { 363 struct rfcomm_dev *dev = (void *) skb->sk; 364 atomic_dec(&dev->wmem_alloc); 365 if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags)) 366 tty_port_tty_wakeup(&dev->port); 367 tty_port_put(&dev->port); 368 } 369 370 static void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev) 371 { 372 tty_port_get(&dev->port); 373 atomic_inc(&dev->wmem_alloc); 374 skb->sk = (void *) dev; 375 skb->destructor = rfcomm_wfree; 376 } 377 378 static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority) 379 { 380 struct sk_buff *skb = alloc_skb(size, priority); 381 if (skb) 382 rfcomm_set_owner_w(skb, dev); 383 return skb; 384 } 385 386 /* ---- Device IOCTLs ---- */ 387 388 #define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP)) 389 390 static int __rfcomm_create_dev(struct sock *sk, void __user *arg) 391 { 392 struct rfcomm_dev_req req; 393 struct rfcomm_dlc *dlc; 394 int id; 395 396 if (copy_from_user(&req, arg, sizeof(req))) 397 return -EFAULT; 398 399 BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags); 400 401 if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) 402 return -EPERM; 403 404 if (req.flags & (1 << RFCOMM_REUSE_DLC)) { 405 /* Socket must be connected */ 406 if (sk->sk_state != BT_CONNECTED) 407 return -EBADFD; 408 409 dlc = rfcomm_pi(sk)->dlc; 410 rfcomm_dlc_hold(dlc); 411 } else { 412 /* Validate the channel is unused */ 413 dlc = rfcomm_dlc_exists(&req.src, &req.dst, req.channel); 414 if (IS_ERR(dlc)) 415 return PTR_ERR(dlc); 416 else if (dlc) { 417 rfcomm_dlc_put(dlc); 418 return -EBUSY; 419 } 420 dlc = rfcomm_dlc_alloc(GFP_KERNEL); 421 if (!dlc) 422 return -ENOMEM; 423 } 424 425 id = rfcomm_dev_add(&req, dlc); 426 if (id < 0) 427 return id; 428 429 if (req.flags & (1 << RFCOMM_REUSE_DLC)) { 430 /* DLC is now used by device. 431 * Socket must be disconnected */ 432 sk->sk_state = BT_CLOSED; 433 } 434 435 return id; 436 } 437 438 static int __rfcomm_release_dev(void __user *arg) 439 { 440 struct rfcomm_dev_req req; 441 struct rfcomm_dev *dev; 442 struct tty_struct *tty; 443 444 if (copy_from_user(&req, arg, sizeof(req))) 445 return -EFAULT; 446 447 BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags); 448 449 dev = rfcomm_dev_get(req.dev_id); 450 if (!dev) 451 return -ENODEV; 452 453 if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) { 454 tty_port_put(&dev->port); 455 return -EPERM; 456 } 457 458 /* only release once */ 459 if (test_and_set_bit(RFCOMM_DEV_RELEASED, &dev->status)) { 460 tty_port_put(&dev->port); 461 return -EALREADY; 462 } 463 464 if (req.flags & (1 << RFCOMM_HANGUP_NOW)) 465 rfcomm_dlc_close(dev->dlc, 0); 466 467 /* Shut down TTY synchronously before freeing rfcomm_dev */ 468 tty = tty_port_tty_get(&dev->port); 469 if (tty) { 470 tty_vhangup(tty); 471 tty_kref_put(tty); 472 } 473 474 if (!test_bit(RFCOMM_TTY_OWNED, &dev->status)) 475 tty_port_put(&dev->port); 476 477 tty_port_put(&dev->port); 478 return 0; 479 } 480 481 static int rfcomm_create_dev(struct sock *sk, void __user *arg) 482 { 483 int ret; 484 485 mutex_lock(&rfcomm_ioctl_mutex); 486 ret = __rfcomm_create_dev(sk, arg); 487 mutex_unlock(&rfcomm_ioctl_mutex); 488 489 return ret; 490 } 491 492 static int rfcomm_release_dev(void __user *arg) 493 { 494 int ret; 495 496 mutex_lock(&rfcomm_ioctl_mutex); 497 ret = __rfcomm_release_dev(arg); 498 mutex_unlock(&rfcomm_ioctl_mutex); 499 500 return ret; 501 } 502 503 static int rfcomm_get_dev_list(void __user *arg) 504 { 505 struct rfcomm_dev *dev; 506 struct rfcomm_dev_list_req *dl; 507 struct rfcomm_dev_info *di; 508 int n = 0, size, err; 509 u16 dev_num; 510 511 BT_DBG(""); 512 513 if (get_user(dev_num, (u16 __user *) arg)) 514 return -EFAULT; 515 516 if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di)) 517 return -EINVAL; 518 519 size = sizeof(*dl) + dev_num * sizeof(*di); 520 521 dl = kzalloc(size, GFP_KERNEL); 522 if (!dl) 523 return -ENOMEM; 524 525 di = dl->dev_info; 526 527 mutex_lock(&rfcomm_dev_lock); 528 529 list_for_each_entry(dev, &rfcomm_dev_list, list) { 530 if (!tty_port_get(&dev->port)) 531 continue; 532 (di + n)->id = dev->id; 533 (di + n)->flags = dev->flags; 534 (di + n)->state = dev->dlc->state; 535 (di + n)->channel = dev->channel; 536 bacpy(&(di + n)->src, &dev->src); 537 bacpy(&(di + n)->dst, &dev->dst); 538 tty_port_put(&dev->port); 539 if (++n >= dev_num) 540 break; 541 } 542 543 mutex_unlock(&rfcomm_dev_lock); 544 545 dl->dev_num = n; 546 size = sizeof(*dl) + n * sizeof(*di); 547 548 err = copy_to_user(arg, dl, size); 549 kfree(dl); 550 551 return err ? -EFAULT : 0; 552 } 553 554 static int rfcomm_get_dev_info(void __user *arg) 555 { 556 struct rfcomm_dev *dev; 557 struct rfcomm_dev_info di; 558 int err = 0; 559 560 BT_DBG(""); 561 562 if (copy_from_user(&di, arg, sizeof(di))) 563 return -EFAULT; 564 565 dev = rfcomm_dev_get(di.id); 566 if (!dev) 567 return -ENODEV; 568 569 di.flags = dev->flags; 570 di.channel = dev->channel; 571 di.state = dev->dlc->state; 572 bacpy(&di.src, &dev->src); 573 bacpy(&di.dst, &dev->dst); 574 575 if (copy_to_user(arg, &di, sizeof(di))) 576 err = -EFAULT; 577 578 tty_port_put(&dev->port); 579 return err; 580 } 581 582 int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) 583 { 584 BT_DBG("cmd %d arg %p", cmd, arg); 585 586 switch (cmd) { 587 case RFCOMMCREATEDEV: 588 return rfcomm_create_dev(sk, arg); 589 590 case RFCOMMRELEASEDEV: 591 return rfcomm_release_dev(arg); 592 593 case RFCOMMGETDEVLIST: 594 return rfcomm_get_dev_list(arg); 595 596 case RFCOMMGETDEVINFO: 597 return rfcomm_get_dev_info(arg); 598 } 599 600 return -EINVAL; 601 } 602 603 /* ---- DLC callbacks ---- */ 604 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb) 605 { 606 struct rfcomm_dev *dev = dlc->owner; 607 608 if (!dev) { 609 kfree_skb(skb); 610 return; 611 } 612 613 if (!skb_queue_empty(&dev->pending)) { 614 skb_queue_tail(&dev->pending, skb); 615 return; 616 } 617 618 BT_DBG("dlc %p len %d", dlc, skb->len); 619 620 tty_insert_flip_string(&dev->port, skb->data, skb->len); 621 tty_flip_buffer_push(&dev->port); 622 623 kfree_skb(skb); 624 } 625 626 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err) 627 { 628 struct rfcomm_dev *dev = dlc->owner; 629 if (!dev) 630 return; 631 632 BT_DBG("dlc %p dev %p err %d", dlc, dev, err); 633 634 dev->err = err; 635 if (dlc->state == BT_CONNECTED) { 636 rfcomm_reparent_device(dev); 637 638 wake_up_interruptible(&dev->port.open_wait); 639 } else if (dlc->state == BT_CLOSED) 640 tty_port_tty_hangup(&dev->port, false); 641 } 642 643 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig) 644 { 645 struct rfcomm_dev *dev = dlc->owner; 646 if (!dev) 647 return; 648 649 BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig); 650 651 if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) 652 tty_port_tty_hangup(&dev->port, true); 653 654 dev->modem_status = 655 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) | 656 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) | 657 ((v24_sig & RFCOMM_V24_IC) ? TIOCM_RI : 0) | 658 ((v24_sig & RFCOMM_V24_DV) ? TIOCM_CD : 0); 659 } 660 661 /* ---- TTY functions ---- */ 662 static void rfcomm_tty_copy_pending(struct rfcomm_dev *dev) 663 { 664 struct sk_buff *skb; 665 int inserted = 0; 666 667 BT_DBG("dev %p", dev); 668 669 rfcomm_dlc_lock(dev->dlc); 670 671 while ((skb = skb_dequeue(&dev->pending))) { 672 inserted += tty_insert_flip_string(&dev->port, skb->data, 673 skb->len); 674 kfree_skb(skb); 675 } 676 677 rfcomm_dlc_unlock(dev->dlc); 678 679 if (inserted > 0) 680 tty_flip_buffer_push(&dev->port); 681 } 682 683 /* do the reverse of install, clearing the tty fields and releasing the 684 * reference to tty_port 685 */ 686 static void rfcomm_tty_cleanup(struct tty_struct *tty) 687 { 688 struct rfcomm_dev *dev = tty->driver_data; 689 690 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags); 691 692 rfcomm_dlc_lock(dev->dlc); 693 tty->driver_data = NULL; 694 rfcomm_dlc_unlock(dev->dlc); 695 696 /* 697 * purge the dlc->tx_queue to avoid circular dependencies 698 * between dev and dlc 699 */ 700 skb_queue_purge(&dev->dlc->tx_queue); 701 702 tty_port_put(&dev->port); 703 } 704 705 /* we acquire the tty_port reference since it's here the tty is first used 706 * by setting the termios. We also populate the driver_data field and install 707 * the tty port 708 */ 709 static int rfcomm_tty_install(struct tty_driver *driver, struct tty_struct *tty) 710 { 711 struct rfcomm_dev *dev; 712 struct rfcomm_dlc *dlc; 713 int err; 714 715 dev = rfcomm_dev_get(tty->index); 716 if (!dev) 717 return -ENODEV; 718 719 dlc = dev->dlc; 720 721 /* Attach TTY and open DLC */ 722 rfcomm_dlc_lock(dlc); 723 tty->driver_data = dev; 724 rfcomm_dlc_unlock(dlc); 725 set_bit(RFCOMM_TTY_ATTACHED, &dev->flags); 726 727 /* install the tty_port */ 728 err = tty_port_install(&dev->port, driver, tty); 729 if (err) { 730 rfcomm_tty_cleanup(tty); 731 return err; 732 } 733 734 /* take over the tty_port reference if the port was created with the 735 * flag RFCOMM_RELEASE_ONHUP. This will force the release of the port 736 * when the last process closes the tty. The behaviour is expected by 737 * userspace. 738 */ 739 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) { 740 set_bit(RFCOMM_TTY_OWNED, &dev->status); 741 tty_port_put(&dev->port); 742 } 743 744 return 0; 745 } 746 747 static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp) 748 { 749 struct rfcomm_dev *dev = tty->driver_data; 750 int err; 751 752 BT_DBG("tty %p id %d", tty, tty->index); 753 754 BT_DBG("dev %p dst %pMR channel %d opened %d", dev, &dev->dst, 755 dev->channel, dev->port.count); 756 757 err = tty_port_open(&dev->port, tty, filp); 758 if (err) 759 return err; 760 761 /* 762 * FIXME: rfcomm should use proper flow control for 763 * received data. This hack will be unnecessary and can 764 * be removed when that's implemented 765 */ 766 rfcomm_tty_copy_pending(dev); 767 768 rfcomm_dlc_unthrottle(dev->dlc); 769 770 return 0; 771 } 772 773 static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp) 774 { 775 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 776 777 BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, 778 dev->port.count); 779 780 tty_port_close(&dev->port, tty, filp); 781 } 782 783 static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count) 784 { 785 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 786 struct rfcomm_dlc *dlc = dev->dlc; 787 struct sk_buff *skb; 788 int sent = 0, size; 789 790 BT_DBG("tty %p count %d", tty, count); 791 792 while (count) { 793 size = min_t(uint, 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 memcpy(skb_put(skb, size), 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 int rfcomm_tty_write_room(struct tty_struct *tty) 813 { 814 struct rfcomm_dev *dev = (struct rfcomm_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 TIOCGSERIAL: 843 BT_ERR("TIOCGSERIAL is not supported"); 844 return -ENOIOCTLCMD; 845 846 case TIOCSSERIAL: 847 BT_ERR("TIOCSSERIAL is not supported"); 848 return -ENOIOCTLCMD; 849 850 case TIOCSERGSTRUCT: 851 BT_ERR("TIOCSERGSTRUCT is not supported"); 852 return -ENOIOCTLCMD; 853 854 case TIOCSERGETLSR: 855 BT_ERR("TIOCSERGETLSR is not supported"); 856 return -ENOIOCTLCMD; 857 858 case TIOCSERCONFIG: 859 BT_ERR("TIOCSERCONFIG is not supported"); 860 return -ENOIOCTLCMD; 861 862 default: 863 return -ENOIOCTLCMD; /* ioctls which we must ignore */ 864 865 } 866 867 return -ENOIOCTLCMD; 868 } 869 870 static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old) 871 { 872 struct ktermios *new = &tty->termios; 873 int old_baud_rate = tty_termios_baud_rate(old); 874 int new_baud_rate = tty_termios_baud_rate(new); 875 876 u8 baud, data_bits, stop_bits, parity, x_on, x_off; 877 u16 changes = 0; 878 879 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 880 881 BT_DBG("tty %p termios %p", tty, old); 882 883 if (!dev || !dev->dlc || !dev->dlc->session) 884 return; 885 886 /* Handle turning off CRTSCTS */ 887 if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS)) 888 BT_DBG("Turning off CRTSCTS unsupported"); 889 890 /* Parity on/off and when on, odd/even */ 891 if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) || 892 ((old->c_cflag & PARODD) != (new->c_cflag & PARODD))) { 893 changes |= RFCOMM_RPN_PM_PARITY; 894 BT_DBG("Parity change detected."); 895 } 896 897 /* Mark and space parity are not supported! */ 898 if (new->c_cflag & PARENB) { 899 if (new->c_cflag & PARODD) { 900 BT_DBG("Parity is ODD"); 901 parity = RFCOMM_RPN_PARITY_ODD; 902 } else { 903 BT_DBG("Parity is EVEN"); 904 parity = RFCOMM_RPN_PARITY_EVEN; 905 } 906 } else { 907 BT_DBG("Parity is OFF"); 908 parity = RFCOMM_RPN_PARITY_NONE; 909 } 910 911 /* Setting the x_on / x_off characters */ 912 if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) { 913 BT_DBG("XOFF custom"); 914 x_on = new->c_cc[VSTOP]; 915 changes |= RFCOMM_RPN_PM_XON; 916 } else { 917 BT_DBG("XOFF default"); 918 x_on = RFCOMM_RPN_XON_CHAR; 919 } 920 921 if (old->c_cc[VSTART] != new->c_cc[VSTART]) { 922 BT_DBG("XON custom"); 923 x_off = new->c_cc[VSTART]; 924 changes |= RFCOMM_RPN_PM_XOFF; 925 } else { 926 BT_DBG("XON default"); 927 x_off = RFCOMM_RPN_XOFF_CHAR; 928 } 929 930 /* Handle setting of stop bits */ 931 if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB)) 932 changes |= RFCOMM_RPN_PM_STOP; 933 934 /* POSIX does not support 1.5 stop bits and RFCOMM does not 935 * support 2 stop bits. So a request for 2 stop bits gets 936 * translated to 1.5 stop bits */ 937 if (new->c_cflag & CSTOPB) 938 stop_bits = RFCOMM_RPN_STOP_15; 939 else 940 stop_bits = RFCOMM_RPN_STOP_1; 941 942 /* Handle number of data bits [5-8] */ 943 if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE)) 944 changes |= RFCOMM_RPN_PM_DATA; 945 946 switch (new->c_cflag & CSIZE) { 947 case CS5: 948 data_bits = RFCOMM_RPN_DATA_5; 949 break; 950 case CS6: 951 data_bits = RFCOMM_RPN_DATA_6; 952 break; 953 case CS7: 954 data_bits = RFCOMM_RPN_DATA_7; 955 break; 956 case CS8: 957 data_bits = RFCOMM_RPN_DATA_8; 958 break; 959 default: 960 data_bits = RFCOMM_RPN_DATA_8; 961 break; 962 } 963 964 /* Handle baudrate settings */ 965 if (old_baud_rate != new_baud_rate) 966 changes |= RFCOMM_RPN_PM_BITRATE; 967 968 switch (new_baud_rate) { 969 case 2400: 970 baud = RFCOMM_RPN_BR_2400; 971 break; 972 case 4800: 973 baud = RFCOMM_RPN_BR_4800; 974 break; 975 case 7200: 976 baud = RFCOMM_RPN_BR_7200; 977 break; 978 case 9600: 979 baud = RFCOMM_RPN_BR_9600; 980 break; 981 case 19200: 982 baud = RFCOMM_RPN_BR_19200; 983 break; 984 case 38400: 985 baud = RFCOMM_RPN_BR_38400; 986 break; 987 case 57600: 988 baud = RFCOMM_RPN_BR_57600; 989 break; 990 case 115200: 991 baud = RFCOMM_RPN_BR_115200; 992 break; 993 case 230400: 994 baud = RFCOMM_RPN_BR_230400; 995 break; 996 default: 997 /* 9600 is standard accordinag to the RFCOMM specification */ 998 baud = RFCOMM_RPN_BR_9600; 999 break; 1000 1001 } 1002 1003 if (changes) 1004 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud, 1005 data_bits, stop_bits, parity, 1006 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes); 1007 } 1008 1009 static void rfcomm_tty_throttle(struct tty_struct *tty) 1010 { 1011 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1012 1013 BT_DBG("tty %p dev %p", tty, dev); 1014 1015 rfcomm_dlc_throttle(dev->dlc); 1016 } 1017 1018 static void rfcomm_tty_unthrottle(struct tty_struct *tty) 1019 { 1020 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1021 1022 BT_DBG("tty %p dev %p", tty, dev); 1023 1024 rfcomm_dlc_unthrottle(dev->dlc); 1025 } 1026 1027 static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty) 1028 { 1029 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1030 1031 BT_DBG("tty %p dev %p", tty, dev); 1032 1033 if (!dev || !dev->dlc) 1034 return 0; 1035 1036 if (!skb_queue_empty(&dev->dlc->tx_queue)) 1037 return dev->dlc->mtu; 1038 1039 return 0; 1040 } 1041 1042 static void rfcomm_tty_flush_buffer(struct tty_struct *tty) 1043 { 1044 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1045 1046 BT_DBG("tty %p dev %p", tty, dev); 1047 1048 if (!dev || !dev->dlc) 1049 return; 1050 1051 skb_queue_purge(&dev->dlc->tx_queue); 1052 tty_wakeup(tty); 1053 } 1054 1055 static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch) 1056 { 1057 BT_DBG("tty %p ch %c", tty, ch); 1058 } 1059 1060 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) 1061 { 1062 BT_DBG("tty %p timeout %d", tty, timeout); 1063 } 1064 1065 static void rfcomm_tty_hangup(struct tty_struct *tty) 1066 { 1067 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1068 1069 BT_DBG("tty %p dev %p", tty, dev); 1070 1071 tty_port_hangup(&dev->port); 1072 } 1073 1074 static int rfcomm_tty_tiocmget(struct tty_struct *tty) 1075 { 1076 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1077 1078 BT_DBG("tty %p dev %p", tty, dev); 1079 1080 return dev->modem_status; 1081 } 1082 1083 static int rfcomm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1084 { 1085 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1086 struct rfcomm_dlc *dlc = dev->dlc; 1087 u8 v24_sig; 1088 1089 BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear); 1090 1091 rfcomm_dlc_get_modem_status(dlc, &v24_sig); 1092 1093 if (set & TIOCM_DSR || set & TIOCM_DTR) 1094 v24_sig |= RFCOMM_V24_RTC; 1095 if (set & TIOCM_RTS || set & TIOCM_CTS) 1096 v24_sig |= RFCOMM_V24_RTR; 1097 if (set & TIOCM_RI) 1098 v24_sig |= RFCOMM_V24_IC; 1099 if (set & TIOCM_CD) 1100 v24_sig |= RFCOMM_V24_DV; 1101 1102 if (clear & TIOCM_DSR || clear & TIOCM_DTR) 1103 v24_sig &= ~RFCOMM_V24_RTC; 1104 if (clear & TIOCM_RTS || clear & TIOCM_CTS) 1105 v24_sig &= ~RFCOMM_V24_RTR; 1106 if (clear & TIOCM_RI) 1107 v24_sig &= ~RFCOMM_V24_IC; 1108 if (clear & TIOCM_CD) 1109 v24_sig &= ~RFCOMM_V24_DV; 1110 1111 rfcomm_dlc_set_modem_status(dlc, v24_sig); 1112 1113 return 0; 1114 } 1115 1116 /* ---- TTY structure ---- */ 1117 1118 static const struct tty_operations rfcomm_ops = { 1119 .open = rfcomm_tty_open, 1120 .close = rfcomm_tty_close, 1121 .write = rfcomm_tty_write, 1122 .write_room = rfcomm_tty_write_room, 1123 .chars_in_buffer = rfcomm_tty_chars_in_buffer, 1124 .flush_buffer = rfcomm_tty_flush_buffer, 1125 .ioctl = rfcomm_tty_ioctl, 1126 .throttle = rfcomm_tty_throttle, 1127 .unthrottle = rfcomm_tty_unthrottle, 1128 .set_termios = rfcomm_tty_set_termios, 1129 .send_xchar = rfcomm_tty_send_xchar, 1130 .hangup = rfcomm_tty_hangup, 1131 .wait_until_sent = rfcomm_tty_wait_until_sent, 1132 .tiocmget = rfcomm_tty_tiocmget, 1133 .tiocmset = rfcomm_tty_tiocmset, 1134 .install = rfcomm_tty_install, 1135 .cleanup = rfcomm_tty_cleanup, 1136 }; 1137 1138 int __init rfcomm_init_ttys(void) 1139 { 1140 int error; 1141 1142 rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS); 1143 if (!rfcomm_tty_driver) 1144 return -ENOMEM; 1145 1146 rfcomm_tty_driver->driver_name = "rfcomm"; 1147 rfcomm_tty_driver->name = "rfcomm"; 1148 rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR; 1149 rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR; 1150 rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; 1151 rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL; 1152 rfcomm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 1153 rfcomm_tty_driver->init_termios = tty_std_termios; 1154 rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL; 1155 rfcomm_tty_driver->init_termios.c_lflag &= ~ICANON; 1156 tty_set_operations(rfcomm_tty_driver, &rfcomm_ops); 1157 1158 error = tty_register_driver(rfcomm_tty_driver); 1159 if (error) { 1160 BT_ERR("Can't register RFCOMM TTY driver"); 1161 put_tty_driver(rfcomm_tty_driver); 1162 return error; 1163 } 1164 1165 BT_INFO("RFCOMM TTY layer initialized"); 1166 1167 return 0; 1168 } 1169 1170 void rfcomm_cleanup_ttys(void) 1171 { 1172 tty_unregister_driver(rfcomm_tty_driver); 1173 put_tty_driver(rfcomm_tty_driver); 1174 } 1175