1 /* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $ 2 * 3 * CAPI 2.0 Interface for Linux 4 * 5 * Copyright 1996 by Carsten Paeth <calle@calle.de> 6 * 7 * This software may be used and distributed according to the terms 8 * of the GNU General Public License, incorporated herein by reference. 9 * 10 */ 11 12 #include <linux/compiler.h> 13 #include <linux/module.h> 14 #include <linux/ethtool.h> 15 #include <linux/errno.h> 16 #include <linux/kernel.h> 17 #include <linux/major.h> 18 #include <linux/sched.h> 19 #include <linux/slab.h> 20 #include <linux/fcntl.h> 21 #include <linux/fs.h> 22 #include <linux/signal.h> 23 #include <linux/mutex.h> 24 #include <linux/mm.h> 25 #include <linux/timer.h> 26 #include <linux/wait.h> 27 #include <linux/tty.h> 28 #include <linux/netdevice.h> 29 #include <linux/ppp_defs.h> 30 #include <linux/ppp-ioctl.h> 31 #include <linux/skbuff.h> 32 #include <linux/proc_fs.h> 33 #include <linux/seq_file.h> 34 #include <linux/poll.h> 35 #include <linux/capi.h> 36 #include <linux/kernelcapi.h> 37 #include <linux/init.h> 38 #include <linux/device.h> 39 #include <linux/moduleparam.h> 40 #include <linux/isdn/capiutil.h> 41 #include <linux/isdn/capicmd.h> 42 43 #include "kcapi.h" 44 45 MODULE_DESCRIPTION("CAPI4Linux: kernel CAPI layer and /dev/capi20 interface"); 46 MODULE_AUTHOR("Carsten Paeth"); 47 MODULE_LICENSE("GPL"); 48 49 /* -------- driver information -------------------------------------- */ 50 51 static DEFINE_MUTEX(capi_mutex); 52 static struct class *capi_class; 53 static int capi_major = 68; /* allocated */ 54 55 module_param_named(major, capi_major, uint, 0); 56 57 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 58 #define CAPINC_NR_PORTS 32 59 #define CAPINC_MAX_PORTS 256 60 61 static int capi_ttyminors = CAPINC_NR_PORTS; 62 63 module_param_named(ttyminors, capi_ttyminors, uint, 0); 64 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 65 66 /* -------- defines ------------------------------------------------- */ 67 68 #define CAPINC_MAX_RECVQUEUE 10 69 #define CAPINC_MAX_SENDQUEUE 10 70 #define CAPI_MAX_BLKSIZE 2048 71 72 /* -------- data structures ----------------------------------------- */ 73 74 struct capidev; 75 struct capincci; 76 struct capiminor; 77 78 struct ackqueue_entry { 79 struct list_head list; 80 u16 datahandle; 81 }; 82 83 struct capiminor { 84 unsigned int minor; 85 86 struct capi20_appl *ap; 87 u32 ncci; 88 atomic_t datahandle; 89 atomic_t msgid; 90 91 struct tty_port port; 92 int ttyinstop; 93 int ttyoutstop; 94 95 struct sk_buff_head inqueue; 96 97 struct sk_buff_head outqueue; 98 int outbytes; 99 struct sk_buff *outskb; 100 spinlock_t outlock; 101 102 /* transmit path */ 103 struct list_head ackqueue; 104 int nack; 105 spinlock_t ackqlock; 106 }; 107 108 struct capincci { 109 struct list_head list; 110 u32 ncci; 111 struct capidev *cdev; 112 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 113 struct capiminor *minorp; 114 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 115 }; 116 117 struct capidev { 118 struct list_head list; 119 struct capi20_appl ap; 120 u16 errcode; 121 unsigned userflags; 122 123 struct sk_buff_head recvqueue; 124 wait_queue_head_t recvwait; 125 126 struct list_head nccis; 127 128 struct mutex lock; 129 }; 130 131 /* -------- global variables ---------------------------------------- */ 132 133 static DEFINE_MUTEX(capidev_list_lock); 134 static LIST_HEAD(capidev_list); 135 136 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 137 138 static DEFINE_SPINLOCK(capiminors_lock); 139 static struct capiminor **capiminors; 140 141 static struct tty_driver *capinc_tty_driver; 142 143 /* -------- datahandles --------------------------------------------- */ 144 145 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle) 146 { 147 struct ackqueue_entry *n; 148 149 n = kmalloc(sizeof(*n), GFP_ATOMIC); 150 if (unlikely(!n)) { 151 printk(KERN_ERR "capi: alloc datahandle failed\n"); 152 return -1; 153 } 154 n->datahandle = datahandle; 155 INIT_LIST_HEAD(&n->list); 156 spin_lock_bh(&mp->ackqlock); 157 list_add_tail(&n->list, &mp->ackqueue); 158 mp->nack++; 159 spin_unlock_bh(&mp->ackqlock); 160 return 0; 161 } 162 163 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle) 164 { 165 struct ackqueue_entry *p, *tmp; 166 167 spin_lock_bh(&mp->ackqlock); 168 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) { 169 if (p->datahandle == datahandle) { 170 list_del(&p->list); 171 mp->nack--; 172 spin_unlock_bh(&mp->ackqlock); 173 kfree(p); 174 return 0; 175 } 176 } 177 spin_unlock_bh(&mp->ackqlock); 178 return -1; 179 } 180 181 static void capiminor_del_all_ack(struct capiminor *mp) 182 { 183 struct ackqueue_entry *p, *tmp; 184 185 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) { 186 list_del(&p->list); 187 kfree(p); 188 mp->nack--; 189 } 190 } 191 192 193 /* -------- struct capiminor ---------------------------------------- */ 194 195 static void capiminor_destroy(struct tty_port *port) 196 { 197 struct capiminor *mp = container_of(port, struct capiminor, port); 198 199 kfree_skb(mp->outskb); 200 skb_queue_purge(&mp->inqueue); 201 skb_queue_purge(&mp->outqueue); 202 capiminor_del_all_ack(mp); 203 kfree(mp); 204 } 205 206 static const struct tty_port_operations capiminor_port_ops = { 207 .destruct = capiminor_destroy, 208 }; 209 210 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci) 211 { 212 struct capiminor *mp; 213 struct device *dev; 214 unsigned int minor; 215 216 mp = kzalloc(sizeof(*mp), GFP_KERNEL); 217 if (!mp) { 218 printk(KERN_ERR "capi: can't alloc capiminor\n"); 219 return NULL; 220 } 221 222 mp->ap = ap; 223 mp->ncci = ncci; 224 INIT_LIST_HEAD(&mp->ackqueue); 225 spin_lock_init(&mp->ackqlock); 226 227 skb_queue_head_init(&mp->inqueue); 228 skb_queue_head_init(&mp->outqueue); 229 spin_lock_init(&mp->outlock); 230 231 tty_port_init(&mp->port); 232 mp->port.ops = &capiminor_port_ops; 233 234 /* Allocate the least unused minor number. */ 235 spin_lock(&capiminors_lock); 236 for (minor = 0; minor < capi_ttyminors; minor++) 237 if (!capiminors[minor]) { 238 capiminors[minor] = mp; 239 break; 240 } 241 spin_unlock(&capiminors_lock); 242 243 if (minor == capi_ttyminors) { 244 printk(KERN_NOTICE "capi: out of minors\n"); 245 goto err_out1; 246 } 247 248 mp->minor = minor; 249 250 dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor, 251 NULL); 252 if (IS_ERR(dev)) 253 goto err_out2; 254 255 return mp; 256 257 err_out2: 258 spin_lock(&capiminors_lock); 259 capiminors[minor] = NULL; 260 spin_unlock(&capiminors_lock); 261 262 err_out1: 263 tty_port_put(&mp->port); 264 return NULL; 265 } 266 267 static struct capiminor *capiminor_get(unsigned int minor) 268 { 269 struct capiminor *mp; 270 271 spin_lock(&capiminors_lock); 272 mp = capiminors[minor]; 273 if (mp) 274 tty_port_get(&mp->port); 275 spin_unlock(&capiminors_lock); 276 277 return mp; 278 } 279 280 static inline void capiminor_put(struct capiminor *mp) 281 { 282 tty_port_put(&mp->port); 283 } 284 285 static void capiminor_free(struct capiminor *mp) 286 { 287 tty_unregister_device(capinc_tty_driver, mp->minor); 288 289 spin_lock(&capiminors_lock); 290 capiminors[mp->minor] = NULL; 291 spin_unlock(&capiminors_lock); 292 293 capiminor_put(mp); 294 } 295 296 /* -------- struct capincci ----------------------------------------- */ 297 298 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np) 299 { 300 if (cdev->userflags & CAPIFLAG_HIGHJACKING) 301 np->minorp = capiminor_alloc(&cdev->ap, np->ncci); 302 } 303 304 static void capincci_free_minor(struct capincci *np) 305 { 306 struct capiminor *mp = np->minorp; 307 struct tty_struct *tty; 308 309 if (mp) { 310 tty = tty_port_tty_get(&mp->port); 311 if (tty) { 312 tty_vhangup(tty); 313 tty_kref_put(tty); 314 } 315 316 capiminor_free(mp); 317 } 318 } 319 320 static inline unsigned int capincci_minor_opencount(struct capincci *np) 321 { 322 struct capiminor *mp = np->minorp; 323 unsigned int count = 0; 324 struct tty_struct *tty; 325 326 if (mp) { 327 tty = tty_port_tty_get(&mp->port); 328 if (tty) { 329 count = tty->count; 330 tty_kref_put(tty); 331 } 332 } 333 return count; 334 } 335 336 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */ 337 338 static inline void 339 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { } 340 static inline void capincci_free_minor(struct capincci *np) { } 341 342 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */ 343 344 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci) 345 { 346 struct capincci *np; 347 348 np = kzalloc(sizeof(*np), GFP_KERNEL); 349 if (!np) 350 return NULL; 351 np->ncci = ncci; 352 np->cdev = cdev; 353 354 capincci_alloc_minor(cdev, np); 355 356 list_add_tail(&np->list, &cdev->nccis); 357 358 return np; 359 } 360 361 static void capincci_free(struct capidev *cdev, u32 ncci) 362 { 363 struct capincci *np, *tmp; 364 365 list_for_each_entry_safe(np, tmp, &cdev->nccis, list) 366 if (ncci == 0xffffffff || np->ncci == ncci) { 367 capincci_free_minor(np); 368 list_del(&np->list); 369 kfree(np); 370 } 371 } 372 373 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 374 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci) 375 { 376 struct capincci *np; 377 378 list_for_each_entry(np, &cdev->nccis, list) 379 if (np->ncci == ncci) 380 return np; 381 return NULL; 382 } 383 384 /* -------- handle data queue --------------------------------------- */ 385 386 static struct sk_buff * 387 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb) 388 { 389 struct sk_buff *nskb; 390 nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL); 391 if (nskb) { 392 u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2); 393 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN); 394 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN); 395 capimsg_setu16(s, 2, mp->ap->applid); 396 capimsg_setu8 (s, 4, CAPI_DATA_B3); 397 capimsg_setu8 (s, 5, CAPI_RESP); 398 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid)); 399 capimsg_setu32(s, 8, mp->ncci); 400 capimsg_setu16(s, 12, datahandle); 401 } 402 return nskb; 403 } 404 405 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb) 406 { 407 unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data); 408 struct tty_struct *tty; 409 struct sk_buff *nskb; 410 u16 errcode, datahandle; 411 struct tty_ldisc *ld; 412 int ret = -1; 413 414 tty = tty_port_tty_get(&mp->port); 415 if (!tty) { 416 pr_debug("capi: currently no receiver\n"); 417 return -1; 418 } 419 420 ld = tty_ldisc_ref(tty); 421 if (!ld) { 422 /* fatal error, do not requeue */ 423 ret = 0; 424 kfree_skb(skb); 425 goto deref_tty; 426 } 427 428 if (ld->ops->receive_buf == NULL) { 429 pr_debug("capi: ldisc has no receive_buf function\n"); 430 /* fatal error, do not requeue */ 431 goto free_skb; 432 } 433 if (mp->ttyinstop) { 434 pr_debug("capi: recv tty throttled\n"); 435 goto deref_ldisc; 436 } 437 438 if (tty->receive_room < datalen) { 439 pr_debug("capi: no room in tty\n"); 440 goto deref_ldisc; 441 } 442 443 nskb = gen_data_b3_resp_for(mp, skb); 444 if (!nskb) { 445 printk(KERN_ERR "capi: gen_data_b3_resp failed\n"); 446 goto deref_ldisc; 447 } 448 449 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4); 450 451 errcode = capi20_put_message(mp->ap, nskb); 452 453 if (errcode == CAPI_NOERROR) { 454 skb_pull(skb, CAPIMSG_LEN(skb->data)); 455 pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n", 456 datahandle, skb->len); 457 ld->ops->receive_buf(tty, skb->data, NULL, skb->len); 458 } else { 459 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n", 460 errcode); 461 kfree_skb(nskb); 462 463 if (errcode == CAPI_SENDQUEUEFULL) 464 goto deref_ldisc; 465 } 466 467 free_skb: 468 ret = 0; 469 kfree_skb(skb); 470 471 deref_ldisc: 472 tty_ldisc_deref(ld); 473 474 deref_tty: 475 tty_kref_put(tty); 476 return ret; 477 } 478 479 static void handle_minor_recv(struct capiminor *mp) 480 { 481 struct sk_buff *skb; 482 483 while ((skb = skb_dequeue(&mp->inqueue)) != NULL) 484 if (handle_recv_skb(mp, skb) < 0) { 485 skb_queue_head(&mp->inqueue, skb); 486 return; 487 } 488 } 489 490 static void handle_minor_send(struct capiminor *mp) 491 { 492 struct tty_struct *tty; 493 struct sk_buff *skb; 494 u16 len; 495 u16 errcode; 496 u16 datahandle; 497 498 tty = tty_port_tty_get(&mp->port); 499 if (!tty) 500 return; 501 502 if (mp->ttyoutstop) { 503 pr_debug("capi: send: tty stopped\n"); 504 tty_kref_put(tty); 505 return; 506 } 507 508 while (1) { 509 spin_lock_bh(&mp->outlock); 510 skb = __skb_dequeue(&mp->outqueue); 511 if (!skb) { 512 spin_unlock_bh(&mp->outlock); 513 break; 514 } 515 len = (u16)skb->len; 516 mp->outbytes -= len; 517 spin_unlock_bh(&mp->outlock); 518 519 datahandle = atomic_inc_return(&mp->datahandle); 520 skb_push(skb, CAPI_DATA_B3_REQ_LEN); 521 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN); 522 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN); 523 capimsg_setu16(skb->data, 2, mp->ap->applid); 524 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3); 525 capimsg_setu8 (skb->data, 5, CAPI_REQ); 526 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid)); 527 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */ 528 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */ 529 capimsg_setu16(skb->data, 16, len); /* Data length */ 530 capimsg_setu16(skb->data, 18, datahandle); 531 capimsg_setu16(skb->data, 20, 0); /* Flags */ 532 533 if (capiminor_add_ack(mp, datahandle) < 0) { 534 skb_pull(skb, CAPI_DATA_B3_REQ_LEN); 535 536 spin_lock_bh(&mp->outlock); 537 __skb_queue_head(&mp->outqueue, skb); 538 mp->outbytes += len; 539 spin_unlock_bh(&mp->outlock); 540 541 break; 542 } 543 errcode = capi20_put_message(mp->ap, skb); 544 if (errcode == CAPI_NOERROR) { 545 pr_debug("capi: DATA_B3_REQ %u len=%u\n", 546 datahandle, len); 547 continue; 548 } 549 capiminor_del_ack(mp, datahandle); 550 551 if (errcode == CAPI_SENDQUEUEFULL) { 552 skb_pull(skb, CAPI_DATA_B3_REQ_LEN); 553 554 spin_lock_bh(&mp->outlock); 555 __skb_queue_head(&mp->outqueue, skb); 556 mp->outbytes += len; 557 spin_unlock_bh(&mp->outlock); 558 559 break; 560 } 561 562 /* ups, drop packet */ 563 printk(KERN_ERR "capi: put_message = %x\n", errcode); 564 kfree_skb(skb); 565 } 566 tty_kref_put(tty); 567 } 568 569 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 570 /* -------- function called by lower level -------------------------- */ 571 572 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb) 573 { 574 struct capidev *cdev = ap->private; 575 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 576 struct capiminor *mp; 577 u16 datahandle; 578 struct capincci *np; 579 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 580 581 mutex_lock(&cdev->lock); 582 583 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) { 584 u16 info = CAPIMSG_U16(skb->data, 12); // Info field 585 if ((info & 0xff00) == 0) 586 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data)); 587 } 588 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) 589 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data)); 590 591 if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) { 592 skb_queue_tail(&cdev->recvqueue, skb); 593 wake_up_interruptible(&cdev->recvwait); 594 goto unlock_out; 595 } 596 597 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE 598 skb_queue_tail(&cdev->recvqueue, skb); 599 wake_up_interruptible(&cdev->recvwait); 600 601 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 602 603 np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data)); 604 if (!np) { 605 printk(KERN_ERR "BUG: capi_signal: ncci not found\n"); 606 skb_queue_tail(&cdev->recvqueue, skb); 607 wake_up_interruptible(&cdev->recvwait); 608 goto unlock_out; 609 } 610 611 mp = np->minorp; 612 if (!mp) { 613 skb_queue_tail(&cdev->recvqueue, skb); 614 wake_up_interruptible(&cdev->recvwait); 615 goto unlock_out; 616 } 617 if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) { 618 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2); 619 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n", 620 datahandle, skb->len-CAPIMSG_LEN(skb->data)); 621 skb_queue_tail(&mp->inqueue, skb); 622 623 handle_minor_recv(mp); 624 625 } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) { 626 627 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4); 628 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n", 629 datahandle, 630 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2)); 631 kfree_skb(skb); 632 capiminor_del_ack(mp, datahandle); 633 tty_port_tty_wakeup(&mp->port); 634 handle_minor_send(mp); 635 636 } else { 637 /* ups, let capi application handle it :-) */ 638 skb_queue_tail(&cdev->recvqueue, skb); 639 wake_up_interruptible(&cdev->recvwait); 640 } 641 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 642 643 unlock_out: 644 mutex_unlock(&cdev->lock); 645 } 646 647 /* -------- file_operations for capidev ----------------------------- */ 648 649 static ssize_t 650 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 651 { 652 struct capidev *cdev = file->private_data; 653 struct sk_buff *skb; 654 size_t copied; 655 int err; 656 657 if (!cdev->ap.applid) 658 return -ENODEV; 659 660 skb = skb_dequeue(&cdev->recvqueue); 661 if (!skb) { 662 if (file->f_flags & O_NONBLOCK) 663 return -EAGAIN; 664 err = wait_event_interruptible(cdev->recvwait, 665 (skb = skb_dequeue(&cdev->recvqueue))); 666 if (err) 667 return err; 668 } 669 if (skb->len > count) { 670 skb_queue_head(&cdev->recvqueue, skb); 671 return -EMSGSIZE; 672 } 673 if (copy_to_user(buf, skb->data, skb->len)) { 674 skb_queue_head(&cdev->recvqueue, skb); 675 return -EFAULT; 676 } 677 copied = skb->len; 678 679 kfree_skb(skb); 680 681 return copied; 682 } 683 684 static ssize_t 685 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 686 { 687 struct capidev *cdev = file->private_data; 688 struct sk_buff *skb; 689 u16 mlen; 690 691 if (!cdev->ap.applid) 692 return -ENODEV; 693 694 if (count < CAPIMSG_BASELEN) 695 return -EINVAL; 696 697 skb = alloc_skb(count, GFP_USER); 698 if (!skb) 699 return -ENOMEM; 700 701 if (copy_from_user(skb_put(skb, count), buf, count)) { 702 kfree_skb(skb); 703 return -EFAULT; 704 } 705 mlen = CAPIMSG_LEN(skb->data); 706 if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) { 707 if (count < CAPI_DATA_B3_REQ_LEN || 708 (size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) { 709 kfree_skb(skb); 710 return -EINVAL; 711 } 712 } else { 713 if (mlen != count) { 714 kfree_skb(skb); 715 return -EINVAL; 716 } 717 } 718 CAPIMSG_SETAPPID(skb->data, cdev->ap.applid); 719 720 if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) { 721 if (count < CAPI_DISCONNECT_B3_RESP_LEN) { 722 kfree_skb(skb); 723 return -EINVAL; 724 } 725 mutex_lock(&cdev->lock); 726 capincci_free(cdev, CAPIMSG_NCCI(skb->data)); 727 mutex_unlock(&cdev->lock); 728 } 729 730 cdev->errcode = capi20_put_message(&cdev->ap, skb); 731 732 if (cdev->errcode) { 733 kfree_skb(skb); 734 return -EIO; 735 } 736 return count; 737 } 738 739 static __poll_t 740 capi_poll(struct file *file, poll_table *wait) 741 { 742 struct capidev *cdev = file->private_data; 743 __poll_t mask = 0; 744 745 if (!cdev->ap.applid) 746 return EPOLLERR; 747 748 poll_wait(file, &(cdev->recvwait), wait); 749 mask = EPOLLOUT | EPOLLWRNORM; 750 if (!skb_queue_empty_lockless(&cdev->recvqueue)) 751 mask |= EPOLLIN | EPOLLRDNORM; 752 return mask; 753 } 754 755 static int 756 capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 757 { 758 struct capidev *cdev = file->private_data; 759 capi_ioctl_struct data; 760 int retval = -EINVAL; 761 void __user *argp = (void __user *)arg; 762 763 switch (cmd) { 764 case CAPI_REGISTER: 765 mutex_lock(&cdev->lock); 766 767 if (cdev->ap.applid) { 768 retval = -EEXIST; 769 goto register_out; 770 } 771 if (copy_from_user(&cdev->ap.rparam, argp, 772 sizeof(struct capi_register_params))) { 773 retval = -EFAULT; 774 goto register_out; 775 } 776 cdev->ap.private = cdev; 777 cdev->ap.recv_message = capi_recv_message; 778 cdev->errcode = capi20_register(&cdev->ap); 779 retval = (int)cdev->ap.applid; 780 if (cdev->errcode) { 781 cdev->ap.applid = 0; 782 retval = -EIO; 783 } 784 785 register_out: 786 mutex_unlock(&cdev->lock); 787 return retval; 788 789 case CAPI_GET_VERSION: 790 if (copy_from_user(&data.contr, argp, 791 sizeof(data.contr))) 792 return -EFAULT; 793 cdev->errcode = capi20_get_version(data.contr, &data.version); 794 if (cdev->errcode) 795 return -EIO; 796 if (copy_to_user(argp, &data.version, 797 sizeof(data.version))) 798 return -EFAULT; 799 return 0; 800 801 case CAPI_GET_SERIAL: 802 if (copy_from_user(&data.contr, argp, 803 sizeof(data.contr))) 804 return -EFAULT; 805 cdev->errcode = capi20_get_serial(data.contr, data.serial); 806 if (cdev->errcode) 807 return -EIO; 808 if (copy_to_user(argp, data.serial, 809 sizeof(data.serial))) 810 return -EFAULT; 811 return 0; 812 813 case CAPI_GET_PROFILE: 814 if (copy_from_user(&data.contr, argp, 815 sizeof(data.contr))) 816 return -EFAULT; 817 818 if (data.contr == 0) { 819 cdev->errcode = capi20_get_profile(data.contr, &data.profile); 820 if (cdev->errcode) 821 return -EIO; 822 823 retval = copy_to_user(argp, 824 &data.profile.ncontroller, 825 sizeof(data.profile.ncontroller)); 826 827 } else { 828 cdev->errcode = capi20_get_profile(data.contr, &data.profile); 829 if (cdev->errcode) 830 return -EIO; 831 832 retval = copy_to_user(argp, &data.profile, 833 sizeof(data.profile)); 834 } 835 if (retval) 836 return -EFAULT; 837 return 0; 838 839 case CAPI_GET_MANUFACTURER: 840 if (copy_from_user(&data.contr, argp, 841 sizeof(data.contr))) 842 return -EFAULT; 843 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer); 844 if (cdev->errcode) 845 return -EIO; 846 847 if (copy_to_user(argp, data.manufacturer, 848 sizeof(data.manufacturer))) 849 return -EFAULT; 850 851 return 0; 852 853 case CAPI_GET_ERRCODE: 854 data.errcode = cdev->errcode; 855 cdev->errcode = CAPI_NOERROR; 856 if (arg) { 857 if (copy_to_user(argp, &data.errcode, 858 sizeof(data.errcode))) 859 return -EFAULT; 860 } 861 return data.errcode; 862 863 case CAPI_INSTALLED: 864 if (capi20_isinstalled() == CAPI_NOERROR) 865 return 0; 866 return -ENXIO; 867 868 case CAPI_MANUFACTURER_CMD: { 869 struct capi_manufacturer_cmd mcmd; 870 if (!capable(CAP_SYS_ADMIN)) 871 return -EPERM; 872 if (copy_from_user(&mcmd, argp, sizeof(mcmd))) 873 return -EFAULT; 874 return capi20_manufacturer(mcmd.cmd, mcmd.data); 875 } 876 case CAPI_SET_FLAGS: 877 case CAPI_CLR_FLAGS: { 878 unsigned userflags; 879 880 if (copy_from_user(&userflags, argp, sizeof(userflags))) 881 return -EFAULT; 882 883 mutex_lock(&cdev->lock); 884 if (cmd == CAPI_SET_FLAGS) 885 cdev->userflags |= userflags; 886 else 887 cdev->userflags &= ~userflags; 888 mutex_unlock(&cdev->lock); 889 return 0; 890 } 891 case CAPI_GET_FLAGS: 892 if (copy_to_user(argp, &cdev->userflags, 893 sizeof(cdev->userflags))) 894 return -EFAULT; 895 return 0; 896 897 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE 898 case CAPI_NCCI_OPENCOUNT: 899 return 0; 900 901 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 902 case CAPI_NCCI_OPENCOUNT: { 903 struct capincci *nccip; 904 unsigned ncci; 905 int count = 0; 906 907 if (copy_from_user(&ncci, argp, sizeof(ncci))) 908 return -EFAULT; 909 910 mutex_lock(&cdev->lock); 911 nccip = capincci_find(cdev, (u32)ncci); 912 if (nccip) 913 count = capincci_minor_opencount(nccip); 914 mutex_unlock(&cdev->lock); 915 return count; 916 } 917 918 case CAPI_NCCI_GETUNIT: { 919 struct capincci *nccip; 920 struct capiminor *mp; 921 unsigned ncci; 922 int unit = -ESRCH; 923 924 if (copy_from_user(&ncci, argp, sizeof(ncci))) 925 return -EFAULT; 926 927 mutex_lock(&cdev->lock); 928 nccip = capincci_find(cdev, (u32)ncci); 929 if (nccip) { 930 mp = nccip->minorp; 931 if (mp) 932 unit = mp->minor; 933 } 934 mutex_unlock(&cdev->lock); 935 return unit; 936 } 937 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 938 939 default: 940 return -EINVAL; 941 } 942 } 943 944 static long 945 capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 946 { 947 int ret; 948 949 mutex_lock(&capi_mutex); 950 ret = capi_ioctl(file, cmd, arg); 951 mutex_unlock(&capi_mutex); 952 953 return ret; 954 } 955 956 #ifdef CONFIG_COMPAT 957 static long 958 capi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 959 { 960 int ret; 961 962 if (cmd == CAPI_MANUFACTURER_CMD) { 963 struct { 964 compat_ulong_t cmd; 965 compat_uptr_t data; 966 } mcmd32; 967 968 if (!capable(CAP_SYS_ADMIN)) 969 return -EPERM; 970 if (copy_from_user(&mcmd32, compat_ptr(arg), sizeof(mcmd32))) 971 return -EFAULT; 972 973 mutex_lock(&capi_mutex); 974 ret = capi20_manufacturer(mcmd32.cmd, compat_ptr(mcmd32.data)); 975 mutex_unlock(&capi_mutex); 976 977 return ret; 978 } 979 980 return capi_unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 981 } 982 #endif 983 984 static int capi_open(struct inode *inode, struct file *file) 985 { 986 struct capidev *cdev; 987 988 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); 989 if (!cdev) 990 return -ENOMEM; 991 992 mutex_init(&cdev->lock); 993 skb_queue_head_init(&cdev->recvqueue); 994 init_waitqueue_head(&cdev->recvwait); 995 INIT_LIST_HEAD(&cdev->nccis); 996 file->private_data = cdev; 997 998 mutex_lock(&capidev_list_lock); 999 list_add_tail(&cdev->list, &capidev_list); 1000 mutex_unlock(&capidev_list_lock); 1001 1002 return stream_open(inode, file); 1003 } 1004 1005 static int capi_release(struct inode *inode, struct file *file) 1006 { 1007 struct capidev *cdev = file->private_data; 1008 1009 mutex_lock(&capidev_list_lock); 1010 list_del(&cdev->list); 1011 mutex_unlock(&capidev_list_lock); 1012 1013 if (cdev->ap.applid) 1014 capi20_release(&cdev->ap); 1015 skb_queue_purge(&cdev->recvqueue); 1016 capincci_free(cdev, 0xffffffff); 1017 1018 kfree(cdev); 1019 return 0; 1020 } 1021 1022 static const struct file_operations capi_fops = 1023 { 1024 .owner = THIS_MODULE, 1025 .llseek = no_llseek, 1026 .read = capi_read, 1027 .write = capi_write, 1028 .poll = capi_poll, 1029 .unlocked_ioctl = capi_unlocked_ioctl, 1030 #ifdef CONFIG_COMPAT 1031 .compat_ioctl = capi_compat_ioctl, 1032 #endif 1033 .open = capi_open, 1034 .release = capi_release, 1035 }; 1036 1037 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 1038 /* -------- tty_operations for capincci ----------------------------- */ 1039 1040 static int 1041 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty) 1042 { 1043 struct capiminor *mp = capiminor_get(tty->index); 1044 int ret = tty_standard_install(driver, tty); 1045 1046 if (ret == 0) 1047 tty->driver_data = mp; 1048 else 1049 capiminor_put(mp); 1050 return ret; 1051 } 1052 1053 static void capinc_tty_cleanup(struct tty_struct *tty) 1054 { 1055 struct capiminor *mp = tty->driver_data; 1056 tty->driver_data = NULL; 1057 capiminor_put(mp); 1058 } 1059 1060 static int capinc_tty_open(struct tty_struct *tty, struct file *filp) 1061 { 1062 struct capiminor *mp = tty->driver_data; 1063 int err; 1064 1065 err = tty_port_open(&mp->port, tty, filp); 1066 if (err) 1067 return err; 1068 1069 handle_minor_recv(mp); 1070 return 0; 1071 } 1072 1073 static void capinc_tty_close(struct tty_struct *tty, struct file *filp) 1074 { 1075 struct capiminor *mp = tty->driver_data; 1076 1077 tty_port_close(&mp->port, tty, filp); 1078 } 1079 1080 static ssize_t capinc_tty_write(struct tty_struct *tty, const u8 *buf, 1081 size_t count) 1082 { 1083 struct capiminor *mp = tty->driver_data; 1084 struct sk_buff *skb; 1085 1086 pr_debug("capinc_tty_write(count=%zu)\n", count); 1087 1088 spin_lock_bh(&mp->outlock); 1089 skb = mp->outskb; 1090 if (skb) { 1091 mp->outskb = NULL; 1092 __skb_queue_tail(&mp->outqueue, skb); 1093 mp->outbytes += skb->len; 1094 } 1095 1096 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC); 1097 if (!skb) { 1098 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n"); 1099 spin_unlock_bh(&mp->outlock); 1100 return -ENOMEM; 1101 } 1102 1103 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN); 1104 skb_put_data(skb, buf, count); 1105 1106 __skb_queue_tail(&mp->outqueue, skb); 1107 mp->outbytes += skb->len; 1108 spin_unlock_bh(&mp->outlock); 1109 1110 handle_minor_send(mp); 1111 1112 return count; 1113 } 1114 1115 static int capinc_tty_put_char(struct tty_struct *tty, u8 ch) 1116 { 1117 struct capiminor *mp = tty->driver_data; 1118 bool invoke_send = false; 1119 struct sk_buff *skb; 1120 int ret = 1; 1121 1122 pr_debug("capinc_put_char(%u)\n", ch); 1123 1124 spin_lock_bh(&mp->outlock); 1125 skb = mp->outskb; 1126 if (skb) { 1127 if (skb_tailroom(skb) > 0) { 1128 skb_put_u8(skb, ch); 1129 goto unlock_out; 1130 } 1131 mp->outskb = NULL; 1132 __skb_queue_tail(&mp->outqueue, skb); 1133 mp->outbytes += skb->len; 1134 invoke_send = true; 1135 } 1136 1137 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC); 1138 if (skb) { 1139 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN); 1140 skb_put_u8(skb, ch); 1141 mp->outskb = skb; 1142 } else { 1143 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch); 1144 ret = 0; 1145 } 1146 1147 unlock_out: 1148 spin_unlock_bh(&mp->outlock); 1149 1150 if (invoke_send) 1151 handle_minor_send(mp); 1152 1153 return ret; 1154 } 1155 1156 static void capinc_tty_flush_chars(struct tty_struct *tty) 1157 { 1158 struct capiminor *mp = tty->driver_data; 1159 struct sk_buff *skb; 1160 1161 spin_lock_bh(&mp->outlock); 1162 skb = mp->outskb; 1163 if (skb) { 1164 mp->outskb = NULL; 1165 __skb_queue_tail(&mp->outqueue, skb); 1166 mp->outbytes += skb->len; 1167 spin_unlock_bh(&mp->outlock); 1168 1169 handle_minor_send(mp); 1170 } else 1171 spin_unlock_bh(&mp->outlock); 1172 1173 handle_minor_recv(mp); 1174 } 1175 1176 static unsigned int capinc_tty_write_room(struct tty_struct *tty) 1177 { 1178 struct capiminor *mp = tty->driver_data; 1179 unsigned int room; 1180 1181 room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue); 1182 room *= CAPI_MAX_BLKSIZE; 1183 pr_debug("capinc_tty_write_room = %u\n", room); 1184 return room; 1185 } 1186 1187 static unsigned int capinc_tty_chars_in_buffer(struct tty_struct *tty) 1188 { 1189 struct capiminor *mp = tty->driver_data; 1190 1191 pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n", 1192 mp->outbytes, mp->nack, 1193 skb_queue_len(&mp->outqueue), 1194 skb_queue_len(&mp->inqueue)); 1195 return mp->outbytes; 1196 } 1197 1198 static void capinc_tty_throttle(struct tty_struct *tty) 1199 { 1200 struct capiminor *mp = tty->driver_data; 1201 mp->ttyinstop = 1; 1202 } 1203 1204 static void capinc_tty_unthrottle(struct tty_struct *tty) 1205 { 1206 struct capiminor *mp = tty->driver_data; 1207 1208 mp->ttyinstop = 0; 1209 handle_minor_recv(mp); 1210 } 1211 1212 static void capinc_tty_stop(struct tty_struct *tty) 1213 { 1214 struct capiminor *mp = tty->driver_data; 1215 1216 mp->ttyoutstop = 1; 1217 } 1218 1219 static void capinc_tty_start(struct tty_struct *tty) 1220 { 1221 struct capiminor *mp = tty->driver_data; 1222 1223 mp->ttyoutstop = 0; 1224 handle_minor_send(mp); 1225 } 1226 1227 static void capinc_tty_hangup(struct tty_struct *tty) 1228 { 1229 struct capiminor *mp = tty->driver_data; 1230 1231 tty_port_hangup(&mp->port); 1232 } 1233 1234 static void capinc_tty_send_xchar(struct tty_struct *tty, u8 ch) 1235 { 1236 pr_debug("capinc_tty_send_xchar(%u)\n", ch); 1237 } 1238 1239 static const struct tty_operations capinc_ops = { 1240 .open = capinc_tty_open, 1241 .close = capinc_tty_close, 1242 .write = capinc_tty_write, 1243 .put_char = capinc_tty_put_char, 1244 .flush_chars = capinc_tty_flush_chars, 1245 .write_room = capinc_tty_write_room, 1246 .chars_in_buffer = capinc_tty_chars_in_buffer, 1247 .throttle = capinc_tty_throttle, 1248 .unthrottle = capinc_tty_unthrottle, 1249 .stop = capinc_tty_stop, 1250 .start = capinc_tty_start, 1251 .hangup = capinc_tty_hangup, 1252 .send_xchar = capinc_tty_send_xchar, 1253 .install = capinc_tty_install, 1254 .cleanup = capinc_tty_cleanup, 1255 }; 1256 1257 static int __init capinc_tty_init(void) 1258 { 1259 struct tty_driver *drv; 1260 int err; 1261 1262 if (capi_ttyminors > CAPINC_MAX_PORTS) 1263 capi_ttyminors = CAPINC_MAX_PORTS; 1264 if (capi_ttyminors <= 0) 1265 capi_ttyminors = CAPINC_NR_PORTS; 1266 1267 capiminors = kcalloc(capi_ttyminors, sizeof(struct capiminor *), 1268 GFP_KERNEL); 1269 if (!capiminors) 1270 return -ENOMEM; 1271 1272 drv = tty_alloc_driver(capi_ttyminors, TTY_DRIVER_REAL_RAW | 1273 TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV); 1274 if (IS_ERR(drv)) { 1275 kfree(capiminors); 1276 return PTR_ERR(drv); 1277 } 1278 drv->driver_name = "capi_nc"; 1279 drv->name = "capi!"; 1280 drv->major = 0; 1281 drv->minor_start = 0; 1282 drv->type = TTY_DRIVER_TYPE_SERIAL; 1283 drv->subtype = SERIAL_TYPE_NORMAL; 1284 drv->init_termios = tty_std_termios; 1285 drv->init_termios.c_iflag = ICRNL; 1286 drv->init_termios.c_oflag = OPOST | ONLCR; 1287 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1288 drv->init_termios.c_lflag = 0; 1289 tty_set_operations(drv, &capinc_ops); 1290 1291 err = tty_register_driver(drv); 1292 if (err) { 1293 tty_driver_kref_put(drv); 1294 kfree(capiminors); 1295 printk(KERN_ERR "Couldn't register capi_nc driver\n"); 1296 return err; 1297 } 1298 capinc_tty_driver = drv; 1299 return 0; 1300 } 1301 1302 static void __exit capinc_tty_exit(void) 1303 { 1304 tty_unregister_driver(capinc_tty_driver); 1305 tty_driver_kref_put(capinc_tty_driver); 1306 kfree(capiminors); 1307 } 1308 1309 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */ 1310 1311 static inline int capinc_tty_init(void) 1312 { 1313 return 0; 1314 } 1315 1316 static inline void capinc_tty_exit(void) { } 1317 1318 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */ 1319 1320 /* -------- /proc functions ----------------------------------------- */ 1321 1322 /* 1323 * /proc/capi/capi20: 1324 * minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt 1325 */ 1326 static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v) 1327 { 1328 struct capidev *cdev; 1329 struct list_head *l; 1330 1331 mutex_lock(&capidev_list_lock); 1332 list_for_each(l, &capidev_list) { 1333 cdev = list_entry(l, struct capidev, list); 1334 seq_printf(m, "0 %d %lu %lu %lu %lu\n", 1335 cdev->ap.applid, 1336 cdev->ap.nrecvctlpkt, 1337 cdev->ap.nrecvdatapkt, 1338 cdev->ap.nsentctlpkt, 1339 cdev->ap.nsentdatapkt); 1340 } 1341 mutex_unlock(&capidev_list_lock); 1342 return 0; 1343 } 1344 1345 /* 1346 * /proc/capi/capi20ncci: 1347 * applid ncci 1348 */ 1349 static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v) 1350 { 1351 struct capidev *cdev; 1352 struct capincci *np; 1353 1354 mutex_lock(&capidev_list_lock); 1355 list_for_each_entry(cdev, &capidev_list, list) { 1356 mutex_lock(&cdev->lock); 1357 list_for_each_entry(np, &cdev->nccis, list) 1358 seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci); 1359 mutex_unlock(&cdev->lock); 1360 } 1361 mutex_unlock(&capidev_list_lock); 1362 return 0; 1363 } 1364 1365 static void __init proc_init(void) 1366 { 1367 proc_create_single("capi/capi20", 0, NULL, capi20_proc_show); 1368 proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show); 1369 } 1370 1371 static void __exit proc_exit(void) 1372 { 1373 remove_proc_entry("capi/capi20", NULL); 1374 remove_proc_entry("capi/capi20ncci", NULL); 1375 } 1376 1377 /* -------- init function and module interface ---------------------- */ 1378 1379 1380 static int __init capi_init(void) 1381 { 1382 const char *compileinfo; 1383 int major_ret; 1384 int ret; 1385 1386 ret = kcapi_init(); 1387 if (ret) 1388 return ret; 1389 1390 major_ret = register_chrdev(capi_major, "capi20", &capi_fops); 1391 if (major_ret < 0) { 1392 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major); 1393 kcapi_exit(); 1394 return major_ret; 1395 } 1396 capi_class = class_create("capi"); 1397 if (IS_ERR(capi_class)) { 1398 unregister_chrdev(capi_major, "capi20"); 1399 kcapi_exit(); 1400 return PTR_ERR(capi_class); 1401 } 1402 1403 device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20"); 1404 1405 if (capinc_tty_init() < 0) { 1406 device_destroy(capi_class, MKDEV(capi_major, 0)); 1407 class_destroy(capi_class); 1408 unregister_chrdev(capi_major, "capi20"); 1409 kcapi_exit(); 1410 return -ENOMEM; 1411 } 1412 1413 proc_init(); 1414 1415 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 1416 compileinfo = " (middleware)"; 1417 #else 1418 compileinfo = " (no middleware)"; 1419 #endif 1420 printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n", 1421 capi_major, compileinfo); 1422 1423 return 0; 1424 } 1425 1426 static void __exit capi_exit(void) 1427 { 1428 proc_exit(); 1429 1430 device_destroy(capi_class, MKDEV(capi_major, 0)); 1431 class_destroy(capi_class); 1432 unregister_chrdev(capi_major, "capi20"); 1433 1434 capinc_tty_exit(); 1435 1436 kcapi_exit(); 1437 } 1438 1439 module_init(capi_init); 1440 module_exit(capi_exit); 1441