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, 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 dl = kzalloc(struct_size(dl, dev_info, dev_num), GFP_KERNEL); 519 if (!dl) 520 return -ENOMEM; 521 522 dl->dev_num = dev_num; 523 di = dl->dev_info; 524 525 mutex_lock(&rfcomm_dev_lock); 526 527 list_for_each_entry(dev, &rfcomm_dev_list, list) { 528 if (!tty_port_get(&dev->port)) 529 continue; 530 di[n].id = dev->id; 531 di[n].flags = dev->flags; 532 di[n].state = dev->dlc->state; 533 di[n].channel = dev->channel; 534 bacpy(&di[n].src, &dev->src); 535 bacpy(&di[n].dst, &dev->dst); 536 tty_port_put(&dev->port); 537 if (++n >= dev_num) 538 break; 539 } 540 541 mutex_unlock(&rfcomm_dev_lock); 542 543 dl->dev_num = n; 544 err = copy_to_user(arg, dl, struct_size(dl, dev_info, n)); 545 kfree(dl); 546 547 return err ? -EFAULT : 0; 548 } 549 550 static int rfcomm_get_dev_info(void __user *arg) 551 { 552 struct rfcomm_dev *dev; 553 struct rfcomm_dev_info di; 554 int err = 0; 555 556 BT_DBG(""); 557 558 if (copy_from_user(&di, arg, sizeof(di))) 559 return -EFAULT; 560 561 dev = rfcomm_dev_get(di.id); 562 if (!dev) 563 return -ENODEV; 564 565 di.flags = dev->flags; 566 di.channel = dev->channel; 567 di.state = dev->dlc->state; 568 bacpy(&di.src, &dev->src); 569 bacpy(&di.dst, &dev->dst); 570 571 if (copy_to_user(arg, &di, sizeof(di))) 572 err = -EFAULT; 573 574 tty_port_put(&dev->port); 575 return err; 576 } 577 578 int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) 579 { 580 BT_DBG("cmd %d arg %p", cmd, arg); 581 582 switch (cmd) { 583 case RFCOMMCREATEDEV: 584 return rfcomm_create_dev(sk, arg); 585 586 case RFCOMMRELEASEDEV: 587 return rfcomm_release_dev(arg); 588 589 case RFCOMMGETDEVLIST: 590 return rfcomm_get_dev_list(arg); 591 592 case RFCOMMGETDEVINFO: 593 return rfcomm_get_dev_info(arg); 594 } 595 596 return -EINVAL; 597 } 598 599 /* ---- DLC callbacks ---- */ 600 static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb) 601 { 602 struct rfcomm_dev *dev = dlc->owner; 603 604 if (!dev) { 605 kfree_skb(skb); 606 return; 607 } 608 609 if (!skb_queue_empty(&dev->pending)) { 610 skb_queue_tail(&dev->pending, skb); 611 return; 612 } 613 614 BT_DBG("dlc %p len %d", dlc, skb->len); 615 616 tty_insert_flip_string(&dev->port, skb->data, skb->len); 617 tty_flip_buffer_push(&dev->port); 618 619 kfree_skb(skb); 620 } 621 622 static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err) 623 { 624 struct rfcomm_dev *dev = dlc->owner; 625 if (!dev) 626 return; 627 628 BT_DBG("dlc %p dev %p err %d", dlc, dev, err); 629 630 dev->err = err; 631 if (dlc->state == BT_CONNECTED) { 632 rfcomm_reparent_device(dev); 633 634 wake_up_interruptible(&dev->port.open_wait); 635 } else if (dlc->state == BT_CLOSED) 636 tty_port_tty_hangup(&dev->port, false); 637 } 638 639 static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig) 640 { 641 struct rfcomm_dev *dev = dlc->owner; 642 if (!dev) 643 return; 644 645 BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig); 646 647 if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) 648 tty_port_tty_hangup(&dev->port, true); 649 650 dev->modem_status = 651 ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) | 652 ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) | 653 ((v24_sig & RFCOMM_V24_IC) ? TIOCM_RI : 0) | 654 ((v24_sig & RFCOMM_V24_DV) ? TIOCM_CD : 0); 655 } 656 657 /* ---- TTY functions ---- */ 658 static void rfcomm_tty_copy_pending(struct rfcomm_dev *dev) 659 { 660 struct sk_buff *skb; 661 int inserted = 0; 662 663 BT_DBG("dev %p", dev); 664 665 rfcomm_dlc_lock(dev->dlc); 666 667 while ((skb = skb_dequeue(&dev->pending))) { 668 inserted += tty_insert_flip_string(&dev->port, skb->data, 669 skb->len); 670 kfree_skb(skb); 671 } 672 673 rfcomm_dlc_unlock(dev->dlc); 674 675 if (inserted > 0) 676 tty_flip_buffer_push(&dev->port); 677 } 678 679 /* do the reverse of install, clearing the tty fields and releasing the 680 * reference to tty_port 681 */ 682 static void rfcomm_tty_cleanup(struct tty_struct *tty) 683 { 684 struct rfcomm_dev *dev = tty->driver_data; 685 686 clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags); 687 688 rfcomm_dlc_lock(dev->dlc); 689 tty->driver_data = NULL; 690 rfcomm_dlc_unlock(dev->dlc); 691 692 /* 693 * purge the dlc->tx_queue to avoid circular dependencies 694 * between dev and dlc 695 */ 696 skb_queue_purge(&dev->dlc->tx_queue); 697 698 tty_port_put(&dev->port); 699 } 700 701 /* we acquire the tty_port reference since it's here the tty is first used 702 * by setting the termios. We also populate the driver_data field and install 703 * the tty port 704 */ 705 static int rfcomm_tty_install(struct tty_driver *driver, struct tty_struct *tty) 706 { 707 struct rfcomm_dev *dev; 708 struct rfcomm_dlc *dlc; 709 int err; 710 711 dev = rfcomm_dev_get(tty->index); 712 if (!dev) 713 return -ENODEV; 714 715 dlc = dev->dlc; 716 717 /* Attach TTY and open DLC */ 718 rfcomm_dlc_lock(dlc); 719 tty->driver_data = dev; 720 rfcomm_dlc_unlock(dlc); 721 set_bit(RFCOMM_TTY_ATTACHED, &dev->flags); 722 723 /* install the tty_port */ 724 err = tty_port_install(&dev->port, driver, tty); 725 if (err) { 726 rfcomm_tty_cleanup(tty); 727 return err; 728 } 729 730 /* take over the tty_port reference if the port was created with the 731 * flag RFCOMM_RELEASE_ONHUP. This will force the release of the port 732 * when the last process closes the tty. The behaviour is expected by 733 * userspace. 734 */ 735 if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) { 736 set_bit(RFCOMM_TTY_OWNED, &dev->status); 737 tty_port_put(&dev->port); 738 } 739 740 return 0; 741 } 742 743 static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp) 744 { 745 struct rfcomm_dev *dev = tty->driver_data; 746 int err; 747 748 BT_DBG("tty %p id %d", tty, tty->index); 749 750 BT_DBG("dev %p dst %pMR channel %d opened %d", dev, &dev->dst, 751 dev->channel, dev->port.count); 752 753 err = tty_port_open(&dev->port, tty, filp); 754 if (err) 755 return err; 756 757 /* 758 * FIXME: rfcomm should use proper flow control for 759 * received data. This hack will be unnecessary and can 760 * be removed when that's implemented 761 */ 762 rfcomm_tty_copy_pending(dev); 763 764 rfcomm_dlc_unthrottle(dev->dlc); 765 766 return 0; 767 } 768 769 static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp) 770 { 771 struct rfcomm_dev *dev = tty->driver_data; 772 773 BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc, 774 dev->port.count); 775 776 tty_port_close(&dev->port, tty, filp); 777 } 778 779 static ssize_t rfcomm_tty_write(struct tty_struct *tty, const u8 *buf, 780 size_t count) 781 { 782 struct rfcomm_dev *dev = tty->driver_data; 783 struct rfcomm_dlc *dlc = dev->dlc; 784 struct sk_buff *skb; 785 size_t sent = 0, size; 786 787 BT_DBG("tty %p count %zu", tty, count); 788 789 while (count) { 790 size = min_t(size_t, count, dlc->mtu); 791 792 skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC); 793 if (!skb) 794 break; 795 796 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE); 797 798 skb_put_data(skb, buf + sent, size); 799 800 rfcomm_dlc_send_noerror(dlc, skb); 801 802 sent += size; 803 count -= size; 804 } 805 806 return sent; 807 } 808 809 static unsigned int rfcomm_tty_write_room(struct tty_struct *tty) 810 { 811 struct rfcomm_dev *dev = tty->driver_data; 812 int room = 0; 813 814 if (dev && dev->dlc) 815 room = rfcomm_room(dev); 816 817 BT_DBG("tty %p room %d", tty, room); 818 819 return room; 820 } 821 822 static int rfcomm_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 823 { 824 BT_DBG("tty %p cmd 0x%02x", tty, cmd); 825 826 switch (cmd) { 827 case TCGETS: 828 BT_DBG("TCGETS is not supported"); 829 return -ENOIOCTLCMD; 830 831 case TCSETS: 832 BT_DBG("TCSETS is not supported"); 833 return -ENOIOCTLCMD; 834 835 case TIOCMIWAIT: 836 BT_DBG("TIOCMIWAIT"); 837 break; 838 839 case TIOCSERGETLSR: 840 BT_ERR("TIOCSERGETLSR is not supported"); 841 return -ENOIOCTLCMD; 842 843 case TIOCSERCONFIG: 844 BT_ERR("TIOCSERCONFIG is not supported"); 845 return -ENOIOCTLCMD; 846 847 default: 848 return -ENOIOCTLCMD; /* ioctls which we must ignore */ 849 850 } 851 852 return -ENOIOCTLCMD; 853 } 854 855 static void rfcomm_tty_set_termios(struct tty_struct *tty, 856 const struct ktermios *old) 857 { 858 struct ktermios *new = &tty->termios; 859 int old_baud_rate = tty_termios_baud_rate(old); 860 int new_baud_rate = tty_termios_baud_rate(new); 861 862 u8 baud, data_bits, stop_bits, parity, x_on, x_off; 863 u16 changes = 0; 864 865 struct rfcomm_dev *dev = tty->driver_data; 866 867 BT_DBG("tty %p termios %p", tty, old); 868 869 if (!dev || !dev->dlc || !dev->dlc->session) 870 return; 871 872 /* Handle turning off CRTSCTS */ 873 if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS)) 874 BT_DBG("Turning off CRTSCTS unsupported"); 875 876 /* Parity on/off and when on, odd/even */ 877 if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) || 878 ((old->c_cflag & PARODD) != (new->c_cflag & PARODD))) { 879 changes |= RFCOMM_RPN_PM_PARITY; 880 BT_DBG("Parity change detected."); 881 } 882 883 /* Mark and space parity are not supported! */ 884 if (new->c_cflag & PARENB) { 885 if (new->c_cflag & PARODD) { 886 BT_DBG("Parity is ODD"); 887 parity = RFCOMM_RPN_PARITY_ODD; 888 } else { 889 BT_DBG("Parity is EVEN"); 890 parity = RFCOMM_RPN_PARITY_EVEN; 891 } 892 } else { 893 BT_DBG("Parity is OFF"); 894 parity = RFCOMM_RPN_PARITY_NONE; 895 } 896 897 /* Setting the x_on / x_off characters */ 898 if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) { 899 BT_DBG("XOFF custom"); 900 x_on = new->c_cc[VSTOP]; 901 changes |= RFCOMM_RPN_PM_XON; 902 } else { 903 BT_DBG("XOFF default"); 904 x_on = RFCOMM_RPN_XON_CHAR; 905 } 906 907 if (old->c_cc[VSTART] != new->c_cc[VSTART]) { 908 BT_DBG("XON custom"); 909 x_off = new->c_cc[VSTART]; 910 changes |= RFCOMM_RPN_PM_XOFF; 911 } else { 912 BT_DBG("XON default"); 913 x_off = RFCOMM_RPN_XOFF_CHAR; 914 } 915 916 /* Handle setting of stop bits */ 917 if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB)) 918 changes |= RFCOMM_RPN_PM_STOP; 919 920 /* POSIX does not support 1.5 stop bits and RFCOMM does not 921 * support 2 stop bits. So a request for 2 stop bits gets 922 * translated to 1.5 stop bits */ 923 if (new->c_cflag & CSTOPB) 924 stop_bits = RFCOMM_RPN_STOP_15; 925 else 926 stop_bits = RFCOMM_RPN_STOP_1; 927 928 /* Handle number of data bits [5-8] */ 929 if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE)) 930 changes |= RFCOMM_RPN_PM_DATA; 931 932 switch (new->c_cflag & CSIZE) { 933 case CS5: 934 data_bits = RFCOMM_RPN_DATA_5; 935 break; 936 case CS6: 937 data_bits = RFCOMM_RPN_DATA_6; 938 break; 939 case CS7: 940 data_bits = RFCOMM_RPN_DATA_7; 941 break; 942 case CS8: 943 data_bits = RFCOMM_RPN_DATA_8; 944 break; 945 default: 946 data_bits = RFCOMM_RPN_DATA_8; 947 break; 948 } 949 950 /* Handle baudrate settings */ 951 if (old_baud_rate != new_baud_rate) 952 changes |= RFCOMM_RPN_PM_BITRATE; 953 954 switch (new_baud_rate) { 955 case 2400: 956 baud = RFCOMM_RPN_BR_2400; 957 break; 958 case 4800: 959 baud = RFCOMM_RPN_BR_4800; 960 break; 961 case 7200: 962 baud = RFCOMM_RPN_BR_7200; 963 break; 964 case 9600: 965 baud = RFCOMM_RPN_BR_9600; 966 break; 967 case 19200: 968 baud = RFCOMM_RPN_BR_19200; 969 break; 970 case 38400: 971 baud = RFCOMM_RPN_BR_38400; 972 break; 973 case 57600: 974 baud = RFCOMM_RPN_BR_57600; 975 break; 976 case 115200: 977 baud = RFCOMM_RPN_BR_115200; 978 break; 979 case 230400: 980 baud = RFCOMM_RPN_BR_230400; 981 break; 982 default: 983 /* 9600 is standard accordinag to the RFCOMM specification */ 984 baud = RFCOMM_RPN_BR_9600; 985 break; 986 987 } 988 989 if (changes) 990 rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud, 991 data_bits, stop_bits, parity, 992 RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes); 993 } 994 995 static void rfcomm_tty_throttle(struct tty_struct *tty) 996 { 997 struct rfcomm_dev *dev = tty->driver_data; 998 999 BT_DBG("tty %p dev %p", tty, dev); 1000 1001 rfcomm_dlc_throttle(dev->dlc); 1002 } 1003 1004 static void rfcomm_tty_unthrottle(struct tty_struct *tty) 1005 { 1006 struct rfcomm_dev *dev = tty->driver_data; 1007 1008 BT_DBG("tty %p dev %p", tty, dev); 1009 1010 rfcomm_dlc_unthrottle(dev->dlc); 1011 } 1012 1013 static unsigned int rfcomm_tty_chars_in_buffer(struct tty_struct *tty) 1014 { 1015 struct rfcomm_dev *dev = tty->driver_data; 1016 1017 BT_DBG("tty %p dev %p", tty, dev); 1018 1019 if (!dev || !dev->dlc) 1020 return 0; 1021 1022 if (!skb_queue_empty(&dev->dlc->tx_queue)) 1023 return dev->dlc->mtu; 1024 1025 return 0; 1026 } 1027 1028 static void rfcomm_tty_flush_buffer(struct tty_struct *tty) 1029 { 1030 struct rfcomm_dev *dev = tty->driver_data; 1031 1032 BT_DBG("tty %p dev %p", tty, dev); 1033 1034 if (!dev || !dev->dlc) 1035 return; 1036 1037 skb_queue_purge(&dev->dlc->tx_queue); 1038 tty_wakeup(tty); 1039 } 1040 1041 static void rfcomm_tty_send_xchar(struct tty_struct *tty, u8 ch) 1042 { 1043 BT_DBG("tty %p ch %c", tty, ch); 1044 } 1045 1046 static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) 1047 { 1048 BT_DBG("tty %p timeout %d", tty, timeout); 1049 } 1050 1051 static void rfcomm_tty_hangup(struct tty_struct *tty) 1052 { 1053 struct rfcomm_dev *dev = tty->driver_data; 1054 1055 BT_DBG("tty %p dev %p", tty, dev); 1056 1057 tty_port_hangup(&dev->port); 1058 } 1059 1060 static int rfcomm_tty_tiocmget(struct tty_struct *tty) 1061 { 1062 struct rfcomm_dev *dev = tty->driver_data; 1063 1064 BT_DBG("tty %p dev %p", tty, dev); 1065 1066 return dev->modem_status; 1067 } 1068 1069 static int rfcomm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1070 { 1071 struct rfcomm_dev *dev = tty->driver_data; 1072 struct rfcomm_dlc *dlc = dev->dlc; 1073 u8 v24_sig; 1074 1075 BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear); 1076 1077 rfcomm_dlc_get_modem_status(dlc, &v24_sig); 1078 1079 if (set & TIOCM_DSR || set & TIOCM_DTR) 1080 v24_sig |= RFCOMM_V24_RTC; 1081 if (set & TIOCM_RTS || set & TIOCM_CTS) 1082 v24_sig |= RFCOMM_V24_RTR; 1083 if (set & TIOCM_RI) 1084 v24_sig |= RFCOMM_V24_IC; 1085 if (set & TIOCM_CD) 1086 v24_sig |= RFCOMM_V24_DV; 1087 1088 if (clear & TIOCM_DSR || clear & TIOCM_DTR) 1089 v24_sig &= ~RFCOMM_V24_RTC; 1090 if (clear & TIOCM_RTS || clear & TIOCM_CTS) 1091 v24_sig &= ~RFCOMM_V24_RTR; 1092 if (clear & TIOCM_RI) 1093 v24_sig &= ~RFCOMM_V24_IC; 1094 if (clear & TIOCM_CD) 1095 v24_sig &= ~RFCOMM_V24_DV; 1096 1097 rfcomm_dlc_set_modem_status(dlc, v24_sig); 1098 1099 return 0; 1100 } 1101 1102 /* ---- TTY structure ---- */ 1103 1104 static const struct tty_operations rfcomm_ops = { 1105 .open = rfcomm_tty_open, 1106 .close = rfcomm_tty_close, 1107 .write = rfcomm_tty_write, 1108 .write_room = rfcomm_tty_write_room, 1109 .chars_in_buffer = rfcomm_tty_chars_in_buffer, 1110 .flush_buffer = rfcomm_tty_flush_buffer, 1111 .ioctl = rfcomm_tty_ioctl, 1112 .throttle = rfcomm_tty_throttle, 1113 .unthrottle = rfcomm_tty_unthrottle, 1114 .set_termios = rfcomm_tty_set_termios, 1115 .send_xchar = rfcomm_tty_send_xchar, 1116 .hangup = rfcomm_tty_hangup, 1117 .wait_until_sent = rfcomm_tty_wait_until_sent, 1118 .tiocmget = rfcomm_tty_tiocmget, 1119 .tiocmset = rfcomm_tty_tiocmset, 1120 .install = rfcomm_tty_install, 1121 .cleanup = rfcomm_tty_cleanup, 1122 }; 1123 1124 int __init rfcomm_init_ttys(void) 1125 { 1126 int error; 1127 1128 rfcomm_tty_driver = tty_alloc_driver(RFCOMM_TTY_PORTS, 1129 TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV); 1130 if (IS_ERR(rfcomm_tty_driver)) 1131 return PTR_ERR(rfcomm_tty_driver); 1132 1133 rfcomm_tty_driver->driver_name = "rfcomm"; 1134 rfcomm_tty_driver->name = "rfcomm"; 1135 rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR; 1136 rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR; 1137 rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; 1138 rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL; 1139 rfcomm_tty_driver->init_termios = tty_std_termios; 1140 rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL; 1141 rfcomm_tty_driver->init_termios.c_lflag &= ~ICANON; 1142 tty_set_operations(rfcomm_tty_driver, &rfcomm_ops); 1143 1144 error = tty_register_driver(rfcomm_tty_driver); 1145 if (error) { 1146 BT_ERR("Can't register RFCOMM TTY driver"); 1147 tty_driver_kref_put(rfcomm_tty_driver); 1148 return error; 1149 } 1150 1151 BT_INFO("RFCOMM TTY layer initialized"); 1152 1153 return 0; 1154 } 1155 1156 void rfcomm_cleanup_ttys(void) 1157 { 1158 tty_unregister_driver(rfcomm_tty_driver); 1159 tty_driver_kref_put(rfcomm_tty_driver); 1160 } 1161