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