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, BDADDR_BREDR); 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 address_show(struct device *tty_dev, 202 struct device_attribute *attr, char *buf) 203 { 204 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev); 205 return sprintf(buf, "%pMR\n", &dev->dst); 206 } 207 208 static ssize_t channel_show(struct device *tty_dev, 209 struct device_attribute *attr, char *buf) 210 { 211 struct rfcomm_dev *dev = dev_get_drvdata(tty_dev); 212 return sprintf(buf, "%d\n", dev->channel); 213 } 214 215 static DEVICE_ATTR_RO(address); 216 static DEVICE_ATTR_RO(channel); 217 218 static struct rfcomm_dev *__rfcomm_dev_add(struct rfcomm_dev_req *req, 219 struct rfcomm_dlc *dlc) 220 { 221 struct rfcomm_dev *dev, *entry; 222 struct list_head *head = &rfcomm_dev_list; 223 int err = 0; 224 225 dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL); 226 if (!dev) 227 return ERR_PTR(-ENOMEM); 228 229 mutex_lock(&rfcomm_dev_lock); 230 231 if (req->dev_id < 0) { 232 dev->id = 0; 233 234 list_for_each_entry(entry, &rfcomm_dev_list, list) { 235 if (entry->id != dev->id) 236 break; 237 238 dev->id++; 239 head = &entry->list; 240 } 241 } else { 242 dev->id = req->dev_id; 243 244 list_for_each_entry(entry, &rfcomm_dev_list, list) { 245 if (entry->id == dev->id) { 246 err = -EADDRINUSE; 247 goto out; 248 } 249 250 if (entry->id > dev->id - 1) 251 break; 252 253 head = &entry->list; 254 } 255 } 256 257 if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) { 258 err = -ENFILE; 259 goto out; 260 } 261 262 sprintf(dev->name, "rfcomm%d", dev->id); 263 264 list_add(&dev->list, head); 265 266 bacpy(&dev->src, &req->src); 267 bacpy(&dev->dst, &req->dst); 268 dev->channel = req->channel; 269 270 dev->flags = req->flags & 271 ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC)); 272 273 tty_port_init(&dev->port); 274 dev->port.ops = &rfcomm_port_ops; 275 276 skb_queue_head_init(&dev->pending); 277 278 rfcomm_dlc_lock(dlc); 279 280 if (req->flags & (1 << RFCOMM_REUSE_DLC)) { 281 struct sock *sk = dlc->owner; 282 struct sk_buff *skb; 283 284 BUG_ON(!sk); 285 286 rfcomm_dlc_throttle(dlc); 287 288 while ((skb = skb_dequeue(&sk->sk_receive_queue))) { 289 skb_orphan(skb); 290 skb_queue_tail(&dev->pending, skb); 291 atomic_sub(skb->len, &sk->sk_rmem_alloc); 292 } 293 } 294 295 dlc->data_ready = rfcomm_dev_data_ready; 296 dlc->state_change = rfcomm_dev_state_change; 297 dlc->modem_status = rfcomm_dev_modem_status; 298 299 dlc->owner = dev; 300 dev->dlc = dlc; 301 302 rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig); 303 304 rfcomm_dlc_unlock(dlc); 305 306 /* It's safe to call __module_get() here because socket already 307 holds reference to this module. */ 308 __module_get(THIS_MODULE); 309 310 mutex_unlock(&rfcomm_dev_lock); 311 return dev; 312 313 out: 314 mutex_unlock(&rfcomm_dev_lock); 315 kfree(dev); 316 return ERR_PTR(err); 317 } 318 319 static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc) 320 { 321 struct rfcomm_dev *dev; 322 struct device *tty; 323 324 BT_DBG("id %d channel %d", req->dev_id, req->channel); 325 326 dev = __rfcomm_dev_add(req, dlc); 327 if (IS_ERR(dev)) { 328 rfcomm_dlc_put(dlc); 329 return PTR_ERR(dev); 330 } 331 332 tty = tty_port_register_device(&dev->port, rfcomm_tty_driver, 333 dev->id, NULL); 334 if (IS_ERR(tty)) { 335 tty_port_put(&dev->port); 336 return PTR_ERR(tty); 337 } 338 339 dev->tty_dev = tty; 340 rfcomm_reparent_device(dev); 341 dev_set_drvdata(dev->tty_dev, dev); 342 343 if (device_create_file(dev->tty_dev, &dev_attr_address) < 0) 344 BT_ERR("Failed to create address attribute"); 345 346 if (device_create_file(dev->tty_dev, &dev_attr_channel) < 0) 347 BT_ERR("Failed to create channel attribute"); 348 349 return dev->id; 350 } 351 352 /* ---- Send buffer ---- */ 353 static inline unsigned int rfcomm_room(struct rfcomm_dev *dev) 354 { 355 struct rfcomm_dlc *dlc = dev->dlc; 356 357 /* Limit the outstanding number of packets not yet sent to 40 */ 358 int pending = 40 - atomic_read(&dev->wmem_alloc); 359 360 return max(0, pending) * dlc->mtu; 361 } 362 363 static void rfcomm_wfree(struct sk_buff *skb) 364 { 365 struct rfcomm_dev *dev = (void *) skb->sk; 366 atomic_dec(&dev->wmem_alloc); 367 if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags)) 368 tty_port_tty_wakeup(&dev->port); 369 tty_port_put(&dev->port); 370 } 371 372 static void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev) 373 { 374 tty_port_get(&dev->port); 375 atomic_inc(&dev->wmem_alloc); 376 skb->sk = (void *) dev; 377 skb->destructor = rfcomm_wfree; 378 } 379 380 static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority) 381 { 382 struct sk_buff *skb = alloc_skb(size, priority); 383 if (skb) 384 rfcomm_set_owner_w(skb, dev); 385 return skb; 386 } 387 388 /* ---- Device IOCTLs ---- */ 389 390 #define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP)) 391 392 static int __rfcomm_create_dev(struct sock *sk, void __user *arg) 393 { 394 struct rfcomm_dev_req req; 395 struct rfcomm_dlc *dlc; 396 int id; 397 398 if (copy_from_user(&req, arg, sizeof(req))) 399 return -EFAULT; 400 401 BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags); 402 403 if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) 404 return -EPERM; 405 406 if (req.flags & (1 << RFCOMM_REUSE_DLC)) { 407 /* Socket must be connected */ 408 if (sk->sk_state != BT_CONNECTED) 409 return -EBADFD; 410 411 dlc = rfcomm_pi(sk)->dlc; 412 rfcomm_dlc_hold(dlc); 413 } else { 414 /* Validate the channel is unused */ 415 dlc = rfcomm_dlc_exists(&req.src, &req.dst, req.channel); 416 if (IS_ERR(dlc)) 417 return PTR_ERR(dlc); 418 if (dlc) 419 return -EBUSY; 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 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 = (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 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, struct ktermios *old) 859 { 860 struct ktermios *new = &tty->termios; 861 int old_baud_rate = tty_termios_baud_rate(old); 862 int new_baud_rate = tty_termios_baud_rate(new); 863 864 u8 baud, data_bits, stop_bits, parity, x_on, x_off; 865 u16 changes = 0; 866 867 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 868 869 BT_DBG("tty %p termios %p", tty, old); 870 871 if (!dev || !dev->dlc || !dev->dlc->session) 872 return; 873 874 /* Handle turning off CRTSCTS */ 875 if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS)) 876 BT_DBG("Turning off CRTSCTS unsupported"); 877 878 /* Parity on/off and when on, odd/even */ 879 if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) || 880 ((old->c_cflag & PARODD) != (new->c_cflag & PARODD))) { 881 changes |= RFCOMM_RPN_PM_PARITY; 882 BT_DBG("Parity change detected."); 883 } 884 885 /* Mark and space parity are not supported! */ 886 if (new->c_cflag & PARENB) { 887 if (new->c_cflag & PARODD) { 888 BT_DBG("Parity is ODD"); 889 parity = RFCOMM_RPN_PARITY_ODD; 890 } else { 891 BT_DBG("Parity is EVEN"); 892 parity = RFCOMM_RPN_PARITY_EVEN; 893 } 894 } else { 895 BT_DBG("Parity is OFF"); 896 parity = RFCOMM_RPN_PARITY_NONE; 897 } 898 899 /* Setting the x_on / x_off characters */ 900 if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) { 901 BT_DBG("XOFF custom"); 902 x_on = new->c_cc[VSTOP]; 903 changes |= RFCOMM_RPN_PM_XON; 904 } else { 905 BT_DBG("XOFF default"); 906 x_on = RFCOMM_RPN_XON_CHAR; 907 } 908 909 if (old->c_cc[VSTART] != new->c_cc[VSTART]) { 910 BT_DBG("XON custom"); 911 x_off = new->c_cc[VSTART]; 912 changes |= RFCOMM_RPN_PM_XOFF; 913 } else { 914 BT_DBG("XON default"); 915 x_off = RFCOMM_RPN_XOFF_CHAR; 916 } 917 918 /* Handle setting of stop bits */ 919 if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB)) 920 changes |= RFCOMM_RPN_PM_STOP; 921 922 /* POSIX does not support 1.5 stop bits and RFCOMM does not 923 * support 2 stop bits. So a request for 2 stop bits gets 924 * translated to 1.5 stop bits */ 925 if (new->c_cflag & CSTOPB) 926 stop_bits = RFCOMM_RPN_STOP_15; 927 else 928 stop_bits = RFCOMM_RPN_STOP_1; 929 930 /* Handle number of data bits [5-8] */ 931 if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE)) 932 changes |= RFCOMM_RPN_PM_DATA; 933 934 switch (new->c_cflag & CSIZE) { 935 case CS5: 936 data_bits = RFCOMM_RPN_DATA_5; 937 break; 938 case CS6: 939 data_bits = RFCOMM_RPN_DATA_6; 940 break; 941 case CS7: 942 data_bits = RFCOMM_RPN_DATA_7; 943 break; 944 case CS8: 945 data_bits = RFCOMM_RPN_DATA_8; 946 break; 947 default: 948 data_bits = RFCOMM_RPN_DATA_8; 949 break; 950 } 951 952 /* Handle baudrate settings */ 953 if (old_baud_rate != new_baud_rate) 954 changes |= RFCOMM_RPN_PM_BITRATE; 955 956 switch (new_baud_rate) { 957 case 2400: 958 baud = RFCOMM_RPN_BR_2400; 959 break; 960 case 4800: 961 baud = RFCOMM_RPN_BR_4800; 962 break; 963 case 7200: 964 baud = RFCOMM_RPN_BR_7200; 965 break; 966 case 9600: 967 baud = RFCOMM_RPN_BR_9600; 968 break; 969 case 19200: 970 baud = RFCOMM_RPN_BR_19200; 971 break; 972 case 38400: 973 baud = RFCOMM_RPN_BR_38400; 974 break; 975 case 57600: 976 baud = RFCOMM_RPN_BR_57600; 977 break; 978 case 115200: 979 baud = RFCOMM_RPN_BR_115200; 980 break; 981 case 230400: 982 baud = RFCOMM_RPN_BR_230400; 983 break; 984 default: 985 /* 9600 is standard accordinag to the RFCOMM specification */ 986 baud = RFCOMM_RPN_BR_9600; 987 break; 988 989 } 990 991 if (changes) 992 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud, 993 data_bits, stop_bits, parity, 994 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes); 995 } 996 997 static void rfcomm_tty_throttle(struct tty_struct *tty) 998 { 999 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1000 1001 BT_DBG("tty %p dev %p", tty, dev); 1002 1003 rfcomm_dlc_throttle(dev->dlc); 1004 } 1005 1006 static void rfcomm_tty_unthrottle(struct tty_struct *tty) 1007 { 1008 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1009 1010 BT_DBG("tty %p dev %p", tty, dev); 1011 1012 rfcomm_dlc_unthrottle(dev->dlc); 1013 } 1014 1015 static unsigned int rfcomm_tty_chars_in_buffer(struct tty_struct *tty) 1016 { 1017 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1018 1019 BT_DBG("tty %p dev %p", tty, dev); 1020 1021 if (!dev || !dev->dlc) 1022 return 0; 1023 1024 if (!skb_queue_empty(&dev->dlc->tx_queue)) 1025 return dev->dlc->mtu; 1026 1027 return 0; 1028 } 1029 1030 static void rfcomm_tty_flush_buffer(struct tty_struct *tty) 1031 { 1032 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1033 1034 BT_DBG("tty %p dev %p", tty, dev); 1035 1036 if (!dev || !dev->dlc) 1037 return; 1038 1039 skb_queue_purge(&dev->dlc->tx_queue); 1040 tty_wakeup(tty); 1041 } 1042 1043 static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch) 1044 { 1045 BT_DBG("tty %p ch %c", tty, ch); 1046 } 1047 1048 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) 1049 { 1050 BT_DBG("tty %p timeout %d", tty, timeout); 1051 } 1052 1053 static void rfcomm_tty_hangup(struct tty_struct *tty) 1054 { 1055 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1056 1057 BT_DBG("tty %p dev %p", tty, dev); 1058 1059 tty_port_hangup(&dev->port); 1060 } 1061 1062 static int rfcomm_tty_tiocmget(struct tty_struct *tty) 1063 { 1064 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1065 1066 BT_DBG("tty %p dev %p", tty, dev); 1067 1068 return dev->modem_status; 1069 } 1070 1071 static int rfcomm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1072 { 1073 struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data; 1074 struct rfcomm_dlc *dlc = dev->dlc; 1075 u8 v24_sig; 1076 1077 BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear); 1078 1079 rfcomm_dlc_get_modem_status(dlc, &v24_sig); 1080 1081 if (set & TIOCM_DSR || set & TIOCM_DTR) 1082 v24_sig |= RFCOMM_V24_RTC; 1083 if (set & TIOCM_RTS || set & TIOCM_CTS) 1084 v24_sig |= RFCOMM_V24_RTR; 1085 if (set & TIOCM_RI) 1086 v24_sig |= RFCOMM_V24_IC; 1087 if (set & TIOCM_CD) 1088 v24_sig |= RFCOMM_V24_DV; 1089 1090 if (clear & TIOCM_DSR || clear & TIOCM_DTR) 1091 v24_sig &= ~RFCOMM_V24_RTC; 1092 if (clear & TIOCM_RTS || clear & TIOCM_CTS) 1093 v24_sig &= ~RFCOMM_V24_RTR; 1094 if (clear & TIOCM_RI) 1095 v24_sig &= ~RFCOMM_V24_IC; 1096 if (clear & TIOCM_CD) 1097 v24_sig &= ~RFCOMM_V24_DV; 1098 1099 rfcomm_dlc_set_modem_status(dlc, v24_sig); 1100 1101 return 0; 1102 } 1103 1104 /* ---- TTY structure ---- */ 1105 1106 static const struct tty_operations rfcomm_ops = { 1107 .open = rfcomm_tty_open, 1108 .close = rfcomm_tty_close, 1109 .write = rfcomm_tty_write, 1110 .write_room = rfcomm_tty_write_room, 1111 .chars_in_buffer = rfcomm_tty_chars_in_buffer, 1112 .flush_buffer = rfcomm_tty_flush_buffer, 1113 .ioctl = rfcomm_tty_ioctl, 1114 .throttle = rfcomm_tty_throttle, 1115 .unthrottle = rfcomm_tty_unthrottle, 1116 .set_termios = rfcomm_tty_set_termios, 1117 .send_xchar = rfcomm_tty_send_xchar, 1118 .hangup = rfcomm_tty_hangup, 1119 .wait_until_sent = rfcomm_tty_wait_until_sent, 1120 .tiocmget = rfcomm_tty_tiocmget, 1121 .tiocmset = rfcomm_tty_tiocmset, 1122 .install = rfcomm_tty_install, 1123 .cleanup = rfcomm_tty_cleanup, 1124 }; 1125 1126 int __init rfcomm_init_ttys(void) 1127 { 1128 int error; 1129 1130 rfcomm_tty_driver = tty_alloc_driver(RFCOMM_TTY_PORTS, 1131 TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV); 1132 if (IS_ERR(rfcomm_tty_driver)) 1133 return PTR_ERR(rfcomm_tty_driver); 1134 1135 rfcomm_tty_driver->driver_name = "rfcomm"; 1136 rfcomm_tty_driver->name = "rfcomm"; 1137 rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR; 1138 rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR; 1139 rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; 1140 rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL; 1141 rfcomm_tty_driver->init_termios = tty_std_termios; 1142 rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL; 1143 rfcomm_tty_driver->init_termios.c_lflag &= ~ICANON; 1144 tty_set_operations(rfcomm_tty_driver, &rfcomm_ops); 1145 1146 error = tty_register_driver(rfcomm_tty_driver); 1147 if (error) { 1148 BT_ERR("Can't register RFCOMM TTY driver"); 1149 tty_driver_kref_put(rfcomm_tty_driver); 1150 return error; 1151 } 1152 1153 BT_INFO("RFCOMM TTY layer initialized"); 1154 1155 return 0; 1156 } 1157 1158 void rfcomm_cleanup_ttys(void) 1159 { 1160 tty_unregister_driver(rfcomm_tty_driver); 1161 tty_driver_kref_put(rfcomm_tty_driver); 1162 } 1163