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 45MODULE_DESCRIPTION("CAPI4Linux: kernel CAPI layer and /dev/capi20 interface"); 46MODULE_AUTHOR("Carsten Paeth"); 47MODULE_LICENSE("GPL"); 48 49/* -------- driver information -------------------------------------- */ 50 51static DEFINE_MUTEX(capi_mutex); 52static const struct class capi_class = { 53 .name = "capi", 54}; 55static int capi_major = 68; /* allocated */ 56 57module_param_named(major, capi_major, uint, 0); 58 59#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 60#define CAPINC_NR_PORTS 32 61#define CAPINC_MAX_PORTS 256 62 63static int capi_ttyminors = CAPINC_NR_PORTS; 64 65module_param_named(ttyminors, capi_ttyminors, uint, 0); 66#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 67 68/* -------- defines ------------------------------------------------- */ 69 70#define CAPINC_MAX_RECVQUEUE 10 71#define CAPINC_MAX_SENDQUEUE 10 72#define CAPI_MAX_BLKSIZE 2048 73 74/* -------- data structures ----------------------------------------- */ 75 76struct capidev; 77struct capincci; 78struct capiminor; 79 80struct ackqueue_entry { 81 struct list_head list; 82 u16 datahandle; 83}; 84 85struct capiminor { 86 unsigned int minor; 87 88 struct capi20_appl *ap; 89 u32 ncci; 90 atomic_t datahandle; 91 atomic_t msgid; 92 93 struct tty_port port; 94 int ttyinstop; 95 int ttyoutstop; 96 97 struct sk_buff_head inqueue; 98 99 struct sk_buff_head outqueue; 100 int outbytes; 101 struct sk_buff *outskb; 102 spinlock_t outlock; 103 104 /* transmit path */ 105 struct list_head ackqueue; 106 int nack; 107 spinlock_t ackqlock; 108}; 109 110struct capincci { 111 struct list_head list; 112 u32 ncci; 113 struct capidev *cdev; 114#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 115 struct capiminor *minorp; 116#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 117}; 118 119struct capidev { 120 struct list_head list; 121 struct capi20_appl ap; 122 u16 errcode; 123 unsigned userflags; 124 125 struct sk_buff_head recvqueue; 126 wait_queue_head_t recvwait; 127 128 struct list_head nccis; 129 130 struct mutex lock; 131}; 132 133/* -------- global variables ---------------------------------------- */ 134 135static DEFINE_MUTEX(capidev_list_lock); 136static LIST_HEAD(capidev_list); 137 138#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 139 140static DEFINE_SPINLOCK(capiminors_lock); 141static struct capiminor **capiminors; 142 143static struct tty_driver *capinc_tty_driver; 144 145/* -------- datahandles --------------------------------------------- */ 146 147static int capiminor_add_ack(struct capiminor *mp, u16 datahandle) 148{ 149 struct ackqueue_entry *n; 150 151 n = kmalloc(sizeof(*n), GFP_ATOMIC); 152 if (unlikely(!n)) { 153 printk(KERN_ERR "capi: alloc datahandle failed\n"); 154 return -1; 155 } 156 n->datahandle = datahandle; 157 INIT_LIST_HEAD(&n->list); 158 spin_lock_bh(&mp->ackqlock); 159 list_add_tail(&n->list, &mp->ackqueue); 160 mp->nack++; 161 spin_unlock_bh(&mp->ackqlock); 162 return 0; 163} 164 165static int capiminor_del_ack(struct capiminor *mp, u16 datahandle) 166{ 167 struct ackqueue_entry *p, *tmp; 168 169 spin_lock_bh(&mp->ackqlock); 170 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) { 171 if (p->datahandle == datahandle) { 172 list_del(&p->list); 173 mp->nack--; 174 spin_unlock_bh(&mp->ackqlock); 175 kfree(p); 176 return 0; 177 } 178 } 179 spin_unlock_bh(&mp->ackqlock); 180 return -1; 181} 182 183static void capiminor_del_all_ack(struct capiminor *mp) 184{ 185 struct ackqueue_entry *p, *tmp; 186 187 list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) { 188 list_del(&p->list); 189 kfree(p); 190 mp->nack--; 191 } 192} 193 194 195/* -------- struct capiminor ---------------------------------------- */ 196 197static void capiminor_destroy(struct tty_port *port) 198{ 199 struct capiminor *mp = container_of(port, struct capiminor, port); 200 201 kfree_skb(mp->outskb); 202 skb_queue_purge(&mp->inqueue); 203 skb_queue_purge(&mp->outqueue); 204 capiminor_del_all_ack(mp); 205 kfree(mp); 206} 207 208static const struct tty_port_operations capiminor_port_ops = { 209 .destruct = capiminor_destroy, 210}; 211 212static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci) 213{ 214 struct capiminor *mp; 215 struct device *dev; 216 unsigned int minor; 217 218 mp = kzalloc(sizeof(*mp), GFP_KERNEL); 219 if (!mp) { 220 printk(KERN_ERR "capi: can't alloc capiminor\n"); 221 return NULL; 222 } 223 224 mp->ap = ap; 225 mp->ncci = ncci; 226 INIT_LIST_HEAD(&mp->ackqueue); 227 spin_lock_init(&mp->ackqlock); 228 229 skb_queue_head_init(&mp->inqueue); 230 skb_queue_head_init(&mp->outqueue); 231 spin_lock_init(&mp->outlock); 232 233 tty_port_init(&mp->port); 234 mp->port.ops = &capiminor_port_ops; 235 236 /* Allocate the least unused minor number. */ 237 spin_lock(&capiminors_lock); 238 for (minor = 0; minor < capi_ttyminors; minor++) 239 if (!capiminors[minor]) { 240 capiminors[minor] = mp; 241 break; 242 } 243 spin_unlock(&capiminors_lock); 244 245 if (minor == capi_ttyminors) { 246 printk(KERN_NOTICE "capi: out of minors\n"); 247 goto err_out1; 248 } 249 250 mp->minor = minor; 251 252 dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor, 253 NULL); 254 if (IS_ERR(dev)) 255 goto err_out2; 256 257 return mp; 258 259err_out2: 260 spin_lock(&capiminors_lock); 261 capiminors[minor] = NULL; 262 spin_unlock(&capiminors_lock); 263 264err_out1: 265 tty_port_put(&mp->port); 266 return NULL; 267} 268 269static struct capiminor *capiminor_get(unsigned int minor) 270{ 271 struct capiminor *mp; 272 273 spin_lock(&capiminors_lock); 274 mp = capiminors[minor]; 275 if (mp) 276 tty_port_get(&mp->port); 277 spin_unlock(&capiminors_lock); 278 279 return mp; 280} 281 282static inline void capiminor_put(struct capiminor *mp) 283{ 284 tty_port_put(&mp->port); 285} 286 287static void capiminor_free(struct capiminor *mp) 288{ 289 tty_unregister_device(capinc_tty_driver, mp->minor); 290 291 spin_lock(&capiminors_lock); 292 capiminors[mp->minor] = NULL; 293 spin_unlock(&capiminors_lock); 294 295 capiminor_put(mp); 296} 297 298/* -------- struct capincci ----------------------------------------- */ 299 300static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np) 301{ 302 if (cdev->userflags & CAPIFLAG_HIGHJACKING) 303 np->minorp = capiminor_alloc(&cdev->ap, np->ncci); 304} 305 306static void capincci_free_minor(struct capincci *np) 307{ 308 struct capiminor *mp = np->minorp; 309 struct tty_struct *tty; 310 311 if (mp) { 312 tty = tty_port_tty_get(&mp->port); 313 if (tty) { 314 tty_vhangup(tty); 315 tty_kref_put(tty); 316 } 317 318 capiminor_free(mp); 319 } 320} 321 322static inline unsigned int capincci_minor_opencount(struct capincci *np) 323{ 324 struct capiminor *mp = np->minorp; 325 unsigned int count = 0; 326 struct tty_struct *tty; 327 328 if (mp) { 329 tty = tty_port_tty_get(&mp->port); 330 if (tty) { 331 count = tty->count; 332 tty_kref_put(tty); 333 } 334 } 335 return count; 336} 337 338#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */ 339 340static inline void 341capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { } 342static inline void capincci_free_minor(struct capincci *np) { } 343 344#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */ 345 346static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci) 347{ 348 struct capincci *np; 349 350 np = kzalloc(sizeof(*np), GFP_KERNEL); 351 if (!np) 352 return NULL; 353 np->ncci = ncci; 354 np->cdev = cdev; 355 356 capincci_alloc_minor(cdev, np); 357 358 list_add_tail(&np->list, &cdev->nccis); 359 360 return np; 361} 362 363static void capincci_free(struct capidev *cdev, u32 ncci) 364{ 365 struct capincci *np, *tmp; 366 367 list_for_each_entry_safe(np, tmp, &cdev->nccis, list) 368 if (ncci == 0xffffffff || np->ncci == ncci) { 369 capincci_free_minor(np); 370 list_del(&np->list); 371 kfree(np); 372 } 373} 374 375#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 376static struct capincci *capincci_find(struct capidev *cdev, u32 ncci) 377{ 378 struct capincci *np; 379 380 list_for_each_entry(np, &cdev->nccis, list) 381 if (np->ncci == ncci) 382 return np; 383 return NULL; 384} 385 386/* -------- handle data queue --------------------------------------- */ 387 388static struct sk_buff * 389gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb) 390{ 391 struct sk_buff *nskb; 392 nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL); 393 if (nskb) { 394 u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2); 395 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN); 396 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN); 397 capimsg_setu16(s, 2, mp->ap->applid); 398 capimsg_setu8 (s, 4, CAPI_DATA_B3); 399 capimsg_setu8 (s, 5, CAPI_RESP); 400 capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid)); 401 capimsg_setu32(s, 8, mp->ncci); 402 capimsg_setu16(s, 12, datahandle); 403 } 404 return nskb; 405} 406 407static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb) 408{ 409 unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data); 410 struct tty_struct *tty; 411 struct sk_buff *nskb; 412 u16 errcode, datahandle; 413 struct tty_ldisc *ld; 414 int ret = -1; 415 416 tty = tty_port_tty_get(&mp->port); 417 if (!tty) { 418 pr_debug("capi: currently no receiver\n"); 419 return -1; 420 } 421 422 ld = tty_ldisc_ref(tty); 423 if (!ld) { 424 /* fatal error, do not requeue */ 425 ret = 0; 426 kfree_skb(skb); 427 goto deref_tty; 428 } 429 430 if (ld->ops->receive_buf == NULL) { 431 pr_debug("capi: ldisc has no receive_buf function\n"); 432 /* fatal error, do not requeue */ 433 goto free_skb; 434 } 435 if (mp->ttyinstop) { 436 pr_debug("capi: recv tty throttled\n"); 437 goto deref_ldisc; 438 } 439 440 if (tty->receive_room < datalen) { 441 pr_debug("capi: no room in tty\n"); 442 goto deref_ldisc; 443 } 444 445 nskb = gen_data_b3_resp_for(mp, skb); 446 if (!nskb) { 447 printk(KERN_ERR "capi: gen_data_b3_resp failed\n"); 448 goto deref_ldisc; 449 } 450 451 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4); 452 453 errcode = capi20_put_message(mp->ap, nskb); 454 455 if (errcode == CAPI_NOERROR) { 456 skb_pull(skb, CAPIMSG_LEN(skb->data)); 457 pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n", 458 datahandle, skb->len); 459 ld->ops->receive_buf(tty, skb->data, NULL, skb->len); 460 } else { 461 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n", 462 errcode); 463 kfree_skb(nskb); 464 465 if (errcode == CAPI_SENDQUEUEFULL) 466 goto deref_ldisc; 467 } 468 469free_skb: 470 ret = 0; 471 kfree_skb(skb); 472 473deref_ldisc: 474 tty_ldisc_deref(ld); 475 476deref_tty: 477 tty_kref_put(tty); 478 return ret; 479} 480 481static void handle_minor_recv(struct capiminor *mp) 482{ 483 struct sk_buff *skb; 484 485 while ((skb = skb_dequeue(&mp->inqueue)) != NULL) 486 if (handle_recv_skb(mp, skb) < 0) { 487 skb_queue_head(&mp->inqueue, skb); 488 return; 489 } 490} 491 492static void handle_minor_send(struct capiminor *mp) 493{ 494 struct tty_struct *tty; 495 struct sk_buff *skb; 496 u16 len; 497 u16 errcode; 498 u16 datahandle; 499 500 tty = tty_port_tty_get(&mp->port); 501 if (!tty) 502 return; 503 504 if (mp->ttyoutstop) { 505 pr_debug("capi: send: tty stopped\n"); 506 tty_kref_put(tty); 507 return; 508 } 509 510 while (1) { 511 spin_lock_bh(&mp->outlock); 512 skb = __skb_dequeue(&mp->outqueue); 513 if (!skb) { 514 spin_unlock_bh(&mp->outlock); 515 break; 516 } 517 len = (u16)skb->len; 518 mp->outbytes -= len; 519 spin_unlock_bh(&mp->outlock); 520 521 datahandle = atomic_inc_return(&mp->datahandle); 522 skb_push(skb, CAPI_DATA_B3_REQ_LEN); 523 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN); 524 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN); 525 capimsg_setu16(skb->data, 2, mp->ap->applid); 526 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3); 527 capimsg_setu8 (skb->data, 5, CAPI_REQ); 528 capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid)); 529 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */ 530 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */ 531 capimsg_setu16(skb->data, 16, len); /* Data length */ 532 capimsg_setu16(skb->data, 18, datahandle); 533 capimsg_setu16(skb->data, 20, 0); /* Flags */ 534 535 if (capiminor_add_ack(mp, datahandle) < 0) { 536 skb_pull(skb, CAPI_DATA_B3_REQ_LEN); 537 538 spin_lock_bh(&mp->outlock); 539 __skb_queue_head(&mp->outqueue, skb); 540 mp->outbytes += len; 541 spin_unlock_bh(&mp->outlock); 542 543 break; 544 } 545 errcode = capi20_put_message(mp->ap, skb); 546 if (errcode == CAPI_NOERROR) { 547 pr_debug("capi: DATA_B3_REQ %u len=%u\n", 548 datahandle, len); 549 continue; 550 } 551 capiminor_del_ack(mp, datahandle); 552 553 if (errcode == CAPI_SENDQUEUEFULL) { 554 skb_pull(skb, CAPI_DATA_B3_REQ_LEN); 555 556 spin_lock_bh(&mp->outlock); 557 __skb_queue_head(&mp->outqueue, skb); 558 mp->outbytes += len; 559 spin_unlock_bh(&mp->outlock); 560 561 break; 562 } 563 564 /* ups, drop packet */ 565 printk(KERN_ERR "capi: put_message = %x\n", errcode); 566 kfree_skb(skb); 567 } 568 tty_kref_put(tty); 569} 570 571#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 572/* -------- function called by lower level -------------------------- */ 573 574static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb) 575{ 576 struct capidev *cdev = ap->private; 577#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 578 struct capiminor *mp; 579 u16 datahandle; 580 struct capincci *np; 581#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 582 583 mutex_lock(&cdev->lock); 584 585 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) { 586 u16 info = CAPIMSG_U16(skb->data, 12); // Info field 587 if ((info & 0xff00) == 0) 588 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data)); 589 } 590 if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) 591 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data)); 592 593 if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) { 594 skb_queue_tail(&cdev->recvqueue, skb); 595 wake_up_interruptible(&cdev->recvwait); 596 goto unlock_out; 597 } 598 599#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE 600 skb_queue_tail(&cdev->recvqueue, skb); 601 wake_up_interruptible(&cdev->recvwait); 602 603#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 604 605 np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data)); 606 if (!np) { 607 printk(KERN_ERR "BUG: capi_signal: ncci not found\n"); 608 skb_queue_tail(&cdev->recvqueue, skb); 609 wake_up_interruptible(&cdev->recvwait); 610 goto unlock_out; 611 } 612 613 mp = np->minorp; 614 if (!mp) { 615 skb_queue_tail(&cdev->recvqueue, skb); 616 wake_up_interruptible(&cdev->recvwait); 617 goto unlock_out; 618 } 619 if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) { 620 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2); 621 pr_debug("capi_signal: DATA_B3_IND %u len=%d\n", 622 datahandle, skb->len-CAPIMSG_LEN(skb->data)); 623 skb_queue_tail(&mp->inqueue, skb); 624 625 handle_minor_recv(mp); 626 627 } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) { 628 629 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4); 630 pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n", 631 datahandle, 632 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2)); 633 kfree_skb(skb); 634 capiminor_del_ack(mp, datahandle); 635 tty_port_tty_wakeup(&mp->port); 636 handle_minor_send(mp); 637 638 } else { 639 /* ups, let capi application handle it :-) */ 640 skb_queue_tail(&cdev->recvqueue, skb); 641 wake_up_interruptible(&cdev->recvwait); 642 } 643#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 644 645unlock_out: 646 mutex_unlock(&cdev->lock); 647} 648 649/* -------- file_operations for capidev ----------------------------- */ 650 651static ssize_t 652capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 653{ 654 struct capidev *cdev = file->private_data; 655 struct sk_buff *skb; 656 size_t copied; 657 int err; 658 659 if (!cdev->ap.applid) 660 return -ENODEV; 661 662 skb = skb_dequeue(&cdev->recvqueue); 663 if (!skb) { 664 if (file->f_flags & O_NONBLOCK) 665 return -EAGAIN; 666 err = wait_event_interruptible(cdev->recvwait, 667 (skb = skb_dequeue(&cdev->recvqueue))); 668 if (err) 669 return err; 670 } 671 if (skb->len > count) { 672 skb_queue_head(&cdev->recvqueue, skb); 673 return -EMSGSIZE; 674 } 675 if (copy_to_user(buf, skb->data, skb->len)) { 676 skb_queue_head(&cdev->recvqueue, skb); 677 return -EFAULT; 678 } 679 copied = skb->len; 680 681 kfree_skb(skb); 682 683 return copied; 684} 685 686static ssize_t 687capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 688{ 689 struct capidev *cdev = file->private_data; 690 struct sk_buff *skb; 691 u16 mlen; 692 693 if (!cdev->ap.applid) 694 return -ENODEV; 695 696 if (count < CAPIMSG_BASELEN) 697 return -EINVAL; 698 699 skb = alloc_skb(count, GFP_USER); 700 if (!skb) 701 return -ENOMEM; 702 703 if (copy_from_user(skb_put(skb, count), buf, count)) { 704 kfree_skb(skb); 705 return -EFAULT; 706 } 707 mlen = CAPIMSG_LEN(skb->data); 708 if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) { 709 if (count < CAPI_DATA_B3_REQ_LEN || 710 (size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) { 711 kfree_skb(skb); 712 return -EINVAL; 713 } 714 } else { 715 if (mlen != count) { 716 kfree_skb(skb); 717 return -EINVAL; 718 } 719 } 720 CAPIMSG_SETAPPID(skb->data, cdev->ap.applid); 721 722 if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) { 723 if (count < CAPI_DISCONNECT_B3_RESP_LEN) { 724 kfree_skb(skb); 725 return -EINVAL; 726 } 727 mutex_lock(&cdev->lock); 728 capincci_free(cdev, CAPIMSG_NCCI(skb->data)); 729 mutex_unlock(&cdev->lock); 730 } 731 732 cdev->errcode = capi20_put_message(&cdev->ap, skb); 733 734 if (cdev->errcode) { 735 kfree_skb(skb); 736 return -EIO; 737 } 738 return count; 739} 740 741static __poll_t 742capi_poll(struct file *file, poll_table *wait) 743{ 744 struct capidev *cdev = file->private_data; 745 __poll_t mask = 0; 746 747 if (!cdev->ap.applid) 748 return EPOLLERR; 749 750 poll_wait(file, &(cdev->recvwait), wait); 751 mask = EPOLLOUT | EPOLLWRNORM; 752 if (!skb_queue_empty_lockless(&cdev->recvqueue)) 753 mask |= EPOLLIN | EPOLLRDNORM; 754 return mask; 755} 756 757static int 758capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 759{ 760 struct capidev *cdev = file->private_data; 761 capi_ioctl_struct data; 762 int retval = -EINVAL; 763 void __user *argp = (void __user *)arg; 764 765 switch (cmd) { 766 case CAPI_REGISTER: 767 mutex_lock(&cdev->lock); 768 769 if (cdev->ap.applid) { 770 retval = -EEXIST; 771 goto register_out; 772 } 773 if (copy_from_user(&cdev->ap.rparam, argp, 774 sizeof(struct capi_register_params))) { 775 retval = -EFAULT; 776 goto register_out; 777 } 778 cdev->ap.private = cdev; 779 cdev->ap.recv_message = capi_recv_message; 780 cdev->errcode = capi20_register(&cdev->ap); 781 retval = (int)cdev->ap.applid; 782 if (cdev->errcode) { 783 cdev->ap.applid = 0; 784 retval = -EIO; 785 } 786 787register_out: 788 mutex_unlock(&cdev->lock); 789 return retval; 790 791 case CAPI_GET_VERSION: 792 if (copy_from_user(&data.contr, argp, 793 sizeof(data.contr))) 794 return -EFAULT; 795 cdev->errcode = capi20_get_version(data.contr, &data.version); 796 if (cdev->errcode) 797 return -EIO; 798 if (copy_to_user(argp, &data.version, 799 sizeof(data.version))) 800 return -EFAULT; 801 return 0; 802 803 case CAPI_GET_SERIAL: 804 if (copy_from_user(&data.contr, argp, 805 sizeof(data.contr))) 806 return -EFAULT; 807 cdev->errcode = capi20_get_serial(data.contr, data.serial); 808 if (cdev->errcode) 809 return -EIO; 810 if (copy_to_user(argp, data.serial, 811 sizeof(data.serial))) 812 return -EFAULT; 813 return 0; 814 815 case CAPI_GET_PROFILE: 816 if (copy_from_user(&data.contr, argp, 817 sizeof(data.contr))) 818 return -EFAULT; 819 820 if (data.contr == 0) { 821 cdev->errcode = capi20_get_profile(data.contr, &data.profile); 822 if (cdev->errcode) 823 return -EIO; 824 825 retval = copy_to_user(argp, 826 &data.profile.ncontroller, 827 sizeof(data.profile.ncontroller)); 828 829 } else { 830 cdev->errcode = capi20_get_profile(data.contr, &data.profile); 831 if (cdev->errcode) 832 return -EIO; 833 834 retval = copy_to_user(argp, &data.profile, 835 sizeof(data.profile)); 836 } 837 if (retval) 838 return -EFAULT; 839 return 0; 840 841 case CAPI_GET_MANUFACTURER: 842 if (copy_from_user(&data.contr, argp, 843 sizeof(data.contr))) 844 return -EFAULT; 845 cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer); 846 if (cdev->errcode) 847 return -EIO; 848 849 if (copy_to_user(argp, data.manufacturer, 850 sizeof(data.manufacturer))) 851 return -EFAULT; 852 853 return 0; 854 855 case CAPI_GET_ERRCODE: 856 data.errcode = cdev->errcode; 857 cdev->errcode = CAPI_NOERROR; 858 if (arg) { 859 if (copy_to_user(argp, &data.errcode, 860 sizeof(data.errcode))) 861 return -EFAULT; 862 } 863 return data.errcode; 864 865 case CAPI_INSTALLED: 866 if (capi20_isinstalled() == CAPI_NOERROR) 867 return 0; 868 return -ENXIO; 869 870 case CAPI_MANUFACTURER_CMD: { 871 struct capi_manufacturer_cmd mcmd; 872 if (!capable(CAP_SYS_ADMIN)) 873 return -EPERM; 874 if (copy_from_user(&mcmd, argp, sizeof(mcmd))) 875 return -EFAULT; 876 return capi20_manufacturer(mcmd.cmd, mcmd.data); 877 } 878 case CAPI_SET_FLAGS: 879 case CAPI_CLR_FLAGS: { 880 unsigned userflags; 881 882 if (copy_from_user(&userflags, argp, sizeof(userflags))) 883 return -EFAULT; 884 885 mutex_lock(&cdev->lock); 886 if (cmd == CAPI_SET_FLAGS) 887 cdev->userflags |= userflags; 888 else 889 cdev->userflags &= ~userflags; 890 mutex_unlock(&cdev->lock); 891 return 0; 892 } 893 case CAPI_GET_FLAGS: 894 if (copy_to_user(argp, &cdev->userflags, 895 sizeof(cdev->userflags))) 896 return -EFAULT; 897 return 0; 898 899#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE 900 case CAPI_NCCI_OPENCOUNT: 901 return 0; 902 903#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 904 case CAPI_NCCI_OPENCOUNT: { 905 struct capincci *nccip; 906 unsigned ncci; 907 int count = 0; 908 909 if (copy_from_user(&ncci, argp, sizeof(ncci))) 910 return -EFAULT; 911 912 mutex_lock(&cdev->lock); 913 nccip = capincci_find(cdev, (u32)ncci); 914 if (nccip) 915 count = capincci_minor_opencount(nccip); 916 mutex_unlock(&cdev->lock); 917 return count; 918 } 919 920 case CAPI_NCCI_GETUNIT: { 921 struct capincci *nccip; 922 struct capiminor *mp; 923 unsigned ncci; 924 int unit = -ESRCH; 925 926 if (copy_from_user(&ncci, argp, sizeof(ncci))) 927 return -EFAULT; 928 929 mutex_lock(&cdev->lock); 930 nccip = capincci_find(cdev, (u32)ncci); 931 if (nccip) { 932 mp = nccip->minorp; 933 if (mp) 934 unit = mp->minor; 935 } 936 mutex_unlock(&cdev->lock); 937 return unit; 938 } 939#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */ 940 941 default: 942 return -EINVAL; 943 } 944} 945 946static long 947capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 948{ 949 int ret; 950 951 mutex_lock(&capi_mutex); 952 ret = capi_ioctl(file, cmd, arg); 953 mutex_unlock(&capi_mutex); 954 955 return ret; 956} 957 958#ifdef CONFIG_COMPAT 959static long 960capi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 961{ 962 int ret; 963 964 if (cmd == CAPI_MANUFACTURER_CMD) { 965 struct { 966 compat_ulong_t cmd; 967 compat_uptr_t data; 968 } mcmd32; 969 970 if (!capable(CAP_SYS_ADMIN)) 971 return -EPERM; 972 if (copy_from_user(&mcmd32, compat_ptr(arg), sizeof(mcmd32))) 973 return -EFAULT; 974 975 mutex_lock(&capi_mutex); 976 ret = capi20_manufacturer(mcmd32.cmd, compat_ptr(mcmd32.data)); 977 mutex_unlock(&capi_mutex); 978 979 return ret; 980 } 981 982 return capi_unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); 983} 984#endif 985 986static int capi_open(struct inode *inode, struct file *file) 987{ 988 struct capidev *cdev; 989 990 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); 991 if (!cdev) 992 return -ENOMEM; 993 994 mutex_init(&cdev->lock); 995 skb_queue_head_init(&cdev->recvqueue); 996 init_waitqueue_head(&cdev->recvwait); 997 INIT_LIST_HEAD(&cdev->nccis); 998 file->private_data = cdev; 999 1000 mutex_lock(&capidev_list_lock); 1001 list_add_tail(&cdev->list, &capidev_list); 1002 mutex_unlock(&capidev_list_lock); 1003 1004 return stream_open(inode, file); 1005} 1006 1007static int capi_release(struct inode *inode, struct file *file) 1008{ 1009 struct capidev *cdev = file->private_data; 1010 1011 mutex_lock(&capidev_list_lock); 1012 list_del(&cdev->list); 1013 mutex_unlock(&capidev_list_lock); 1014 1015 if (cdev->ap.applid) 1016 capi20_release(&cdev->ap); 1017 skb_queue_purge(&cdev->recvqueue); 1018 capincci_free(cdev, 0xffffffff); 1019 1020 kfree(cdev); 1021 return 0; 1022} 1023 1024static const struct file_operations capi_fops = 1025{ 1026 .owner = THIS_MODULE, 1027 .llseek = no_llseek, 1028 .read = capi_read, 1029 .write = capi_write, 1030 .poll = capi_poll, 1031 .unlocked_ioctl = capi_unlocked_ioctl, 1032#ifdef CONFIG_COMPAT 1033 .compat_ioctl = capi_compat_ioctl, 1034#endif 1035 .open = capi_open, 1036 .release = capi_release, 1037}; 1038 1039#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 1040/* -------- tty_operations for capincci ----------------------------- */ 1041 1042static int 1043capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty) 1044{ 1045 struct capiminor *mp = capiminor_get(tty->index); 1046 int ret = tty_standard_install(driver, tty); 1047 1048 if (ret == 0) 1049 tty->driver_data = mp; 1050 else 1051 capiminor_put(mp); 1052 return ret; 1053} 1054 1055static void capinc_tty_cleanup(struct tty_struct *tty) 1056{ 1057 struct capiminor *mp = tty->driver_data; 1058 tty->driver_data = NULL; 1059 capiminor_put(mp); 1060} 1061 1062static int capinc_tty_open(struct tty_struct *tty, struct file *filp) 1063{ 1064 struct capiminor *mp = tty->driver_data; 1065 int err; 1066 1067 err = tty_port_open(&mp->port, tty, filp); 1068 if (err) 1069 return err; 1070 1071 handle_minor_recv(mp); 1072 return 0; 1073} 1074 1075static void capinc_tty_close(struct tty_struct *tty, struct file *filp) 1076{ 1077 struct capiminor *mp = tty->driver_data; 1078 1079 tty_port_close(&mp->port, tty, filp); 1080} 1081 1082static ssize_t capinc_tty_write(struct tty_struct *tty, const u8 *buf, 1083 size_t count) 1084{ 1085 struct capiminor *mp = tty->driver_data; 1086 struct sk_buff *skb; 1087 1088 pr_debug("capinc_tty_write(count=%zu)\n", count); 1089 1090 spin_lock_bh(&mp->outlock); 1091 skb = mp->outskb; 1092 if (skb) { 1093 mp->outskb = NULL; 1094 __skb_queue_tail(&mp->outqueue, skb); 1095 mp->outbytes += skb->len; 1096 } 1097 1098 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC); 1099 if (!skb) { 1100 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n"); 1101 spin_unlock_bh(&mp->outlock); 1102 return -ENOMEM; 1103 } 1104 1105 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN); 1106 skb_put_data(skb, buf, count); 1107 1108 __skb_queue_tail(&mp->outqueue, skb); 1109 mp->outbytes += skb->len; 1110 spin_unlock_bh(&mp->outlock); 1111 1112 handle_minor_send(mp); 1113 1114 return count; 1115} 1116 1117static int capinc_tty_put_char(struct tty_struct *tty, u8 ch) 1118{ 1119 struct capiminor *mp = tty->driver_data; 1120 bool invoke_send = false; 1121 struct sk_buff *skb; 1122 int ret = 1; 1123 1124 pr_debug("capinc_put_char(%u)\n", ch); 1125 1126 spin_lock_bh(&mp->outlock); 1127 skb = mp->outskb; 1128 if (skb) { 1129 if (skb_tailroom(skb) > 0) { 1130 skb_put_u8(skb, ch); 1131 goto unlock_out; 1132 } 1133 mp->outskb = NULL; 1134 __skb_queue_tail(&mp->outqueue, skb); 1135 mp->outbytes += skb->len; 1136 invoke_send = true; 1137 } 1138 1139 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC); 1140 if (skb) { 1141 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN); 1142 skb_put_u8(skb, ch); 1143 mp->outskb = skb; 1144 } else { 1145 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch); 1146 ret = 0; 1147 } 1148 1149unlock_out: 1150 spin_unlock_bh(&mp->outlock); 1151 1152 if (invoke_send) 1153 handle_minor_send(mp); 1154 1155 return ret; 1156} 1157 1158static void capinc_tty_flush_chars(struct tty_struct *tty) 1159{ 1160 struct capiminor *mp = tty->driver_data; 1161 struct sk_buff *skb; 1162 1163 spin_lock_bh(&mp->outlock); 1164 skb = mp->outskb; 1165 if (skb) { 1166 mp->outskb = NULL; 1167 __skb_queue_tail(&mp->outqueue, skb); 1168 mp->outbytes += skb->len; 1169 spin_unlock_bh(&mp->outlock); 1170 1171 handle_minor_send(mp); 1172 } else 1173 spin_unlock_bh(&mp->outlock); 1174 1175 handle_minor_recv(mp); 1176} 1177 1178static unsigned int capinc_tty_write_room(struct tty_struct *tty) 1179{ 1180 struct capiminor *mp = tty->driver_data; 1181 unsigned int room; 1182 1183 room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue); 1184 room *= CAPI_MAX_BLKSIZE; 1185 pr_debug("capinc_tty_write_room = %u\n", room); 1186 return room; 1187} 1188 1189static unsigned int capinc_tty_chars_in_buffer(struct tty_struct *tty) 1190{ 1191 struct capiminor *mp = tty->driver_data; 1192 1193 pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n", 1194 mp->outbytes, mp->nack, 1195 skb_queue_len(&mp->outqueue), 1196 skb_queue_len(&mp->inqueue)); 1197 return mp->outbytes; 1198} 1199 1200static void capinc_tty_throttle(struct tty_struct *tty) 1201{ 1202 struct capiminor *mp = tty->driver_data; 1203 mp->ttyinstop = 1; 1204} 1205 1206static void capinc_tty_unthrottle(struct tty_struct *tty) 1207{ 1208 struct capiminor *mp = tty->driver_data; 1209 1210 mp->ttyinstop = 0; 1211 handle_minor_recv(mp); 1212} 1213 1214static void capinc_tty_stop(struct tty_struct *tty) 1215{ 1216 struct capiminor *mp = tty->driver_data; 1217 1218 mp->ttyoutstop = 1; 1219} 1220 1221static void capinc_tty_start(struct tty_struct *tty) 1222{ 1223 struct capiminor *mp = tty->driver_data; 1224 1225 mp->ttyoutstop = 0; 1226 handle_minor_send(mp); 1227} 1228 1229static void capinc_tty_hangup(struct tty_struct *tty) 1230{ 1231 struct capiminor *mp = tty->driver_data; 1232 1233 tty_port_hangup(&mp->port); 1234} 1235 1236static void capinc_tty_send_xchar(struct tty_struct *tty, u8 ch) 1237{ 1238 pr_debug("capinc_tty_send_xchar(%u)\n", ch); 1239} 1240 1241static const struct tty_operations capinc_ops = { 1242 .open = capinc_tty_open, 1243 .close = capinc_tty_close, 1244 .write = capinc_tty_write, 1245 .put_char = capinc_tty_put_char, 1246 .flush_chars = capinc_tty_flush_chars, 1247 .write_room = capinc_tty_write_room, 1248 .chars_in_buffer = capinc_tty_chars_in_buffer, 1249 .throttle = capinc_tty_throttle, 1250 .unthrottle = capinc_tty_unthrottle, 1251 .stop = capinc_tty_stop, 1252 .start = capinc_tty_start, 1253 .hangup = capinc_tty_hangup, 1254 .send_xchar = capinc_tty_send_xchar, 1255 .install = capinc_tty_install, 1256 .cleanup = capinc_tty_cleanup, 1257}; 1258 1259static int __init capinc_tty_init(void) 1260{ 1261 struct tty_driver *drv; 1262 int err; 1263 1264 if (capi_ttyminors > CAPINC_MAX_PORTS) 1265 capi_ttyminors = CAPINC_MAX_PORTS; 1266 if (capi_ttyminors <= 0) 1267 capi_ttyminors = CAPINC_NR_PORTS; 1268 1269 capiminors = kcalloc(capi_ttyminors, sizeof(struct capiminor *), 1270 GFP_KERNEL); 1271 if (!capiminors) 1272 return -ENOMEM; 1273 1274 drv = tty_alloc_driver(capi_ttyminors, TTY_DRIVER_REAL_RAW | 1275 TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV); 1276 if (IS_ERR(drv)) { 1277 kfree(capiminors); 1278 return PTR_ERR(drv); 1279 } 1280 drv->driver_name = "capi_nc"; 1281 drv->name = "capi!"; 1282 drv->major = 0; 1283 drv->minor_start = 0; 1284 drv->type = TTY_DRIVER_TYPE_SERIAL; 1285 drv->subtype = SERIAL_TYPE_NORMAL; 1286 drv->init_termios = tty_std_termios; 1287 drv->init_termios.c_iflag = ICRNL; 1288 drv->init_termios.c_oflag = OPOST | ONLCR; 1289 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 1290 drv->init_termios.c_lflag = 0; 1291 tty_set_operations(drv, &capinc_ops); 1292 1293 err = tty_register_driver(drv); 1294 if (err) { 1295 tty_driver_kref_put(drv); 1296 kfree(capiminors); 1297 printk(KERN_ERR "Couldn't register capi_nc driver\n"); 1298 return err; 1299 } 1300 capinc_tty_driver = drv; 1301 return 0; 1302} 1303 1304static void __exit capinc_tty_exit(void) 1305{ 1306 tty_unregister_driver(capinc_tty_driver); 1307 tty_driver_kref_put(capinc_tty_driver); 1308 kfree(capiminors); 1309} 1310 1311#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */ 1312 1313static inline int capinc_tty_init(void) 1314{ 1315 return 0; 1316} 1317 1318static inline void capinc_tty_exit(void) { } 1319 1320#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */ 1321 1322/* -------- /proc functions ----------------------------------------- */ 1323 1324/* 1325 * /proc/capi/capi20: 1326 * minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt 1327 */ 1328static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v) 1329{ 1330 struct capidev *cdev; 1331 struct list_head *l; 1332 1333 mutex_lock(&capidev_list_lock); 1334 list_for_each(l, &capidev_list) { 1335 cdev = list_entry(l, struct capidev, list); 1336 seq_printf(m, "0 %d %lu %lu %lu %lu\n", 1337 cdev->ap.applid, 1338 cdev->ap.nrecvctlpkt, 1339 cdev->ap.nrecvdatapkt, 1340 cdev->ap.nsentctlpkt, 1341 cdev->ap.nsentdatapkt); 1342 } 1343 mutex_unlock(&capidev_list_lock); 1344 return 0; 1345} 1346 1347/* 1348 * /proc/capi/capi20ncci: 1349 * applid ncci 1350 */ 1351static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v) 1352{ 1353 struct capidev *cdev; 1354 struct capincci *np; 1355 1356 mutex_lock(&capidev_list_lock); 1357 list_for_each_entry(cdev, &capidev_list, list) { 1358 mutex_lock(&cdev->lock); 1359 list_for_each_entry(np, &cdev->nccis, list) 1360 seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci); 1361 mutex_unlock(&cdev->lock); 1362 } 1363 mutex_unlock(&capidev_list_lock); 1364 return 0; 1365} 1366 1367static void __init proc_init(void) 1368{ 1369 proc_create_single("capi/capi20", 0, NULL, capi20_proc_show); 1370 proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show); 1371} 1372 1373static void __exit proc_exit(void) 1374{ 1375 remove_proc_entry("capi/capi20", NULL); 1376 remove_proc_entry("capi/capi20ncci", NULL); 1377} 1378 1379/* -------- init function and module interface ---------------------- */ 1380 1381 1382static int __init capi_init(void) 1383{ 1384 const char *compileinfo; 1385 int major_ret; 1386 int ret; 1387 1388 ret = kcapi_init(); 1389 if (ret) 1390 return ret; 1391 1392 major_ret = register_chrdev(capi_major, "capi20", &capi_fops); 1393 if (major_ret < 0) { 1394 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major); 1395 kcapi_exit(); 1396 return major_ret; 1397 } 1398 1399 ret = class_register(&capi_class); 1400 if (ret) { 1401 unregister_chrdev(capi_major, "capi20"); 1402 kcapi_exit(); 1403 return ret; 1404 } 1405 1406 device_create(&capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20"); 1407 1408 if (capinc_tty_init() < 0) { 1409 device_destroy(&capi_class, MKDEV(capi_major, 0)); 1410 class_unregister(&capi_class); 1411 unregister_chrdev(capi_major, "capi20"); 1412 kcapi_exit(); 1413 return -ENOMEM; 1414 } 1415 1416 proc_init(); 1417 1418#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE 1419 compileinfo = " (middleware)"; 1420#else 1421 compileinfo = " (no middleware)"; 1422#endif 1423 printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n", 1424 capi_major, compileinfo); 1425 1426 return 0; 1427} 1428 1429static void __exit capi_exit(void) 1430{ 1431 proc_exit(); 1432 1433 device_destroy(&capi_class, MKDEV(capi_major, 0)); 1434 class_unregister(&capi_class); 1435 unregister_chrdev(capi_major, "capi20"); 1436 1437 capinc_tty_exit(); 1438 1439 kcapi_exit(); 1440} 1441 1442module_init(capi_init); 1443module_exit(capi_exit); 1444