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1/* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $2 *3 * CAPI 2.0 Interface for Linux4 *5 * Copyright 1996 by Carsten Paeth <calle@calle.de>6 *7 * This software may be used and distributed according to the terms8 * 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_MIDDLEWARE60#define CAPINC_NR_PORTS 3261#define CAPINC_MAX_PORTS 25662 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 1071#define CAPINC_MAX_SENDQUEUE 1072#define CAPI_MAX_BLKSIZE 204873 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_MIDDLEWARE115 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_MIDDLEWARE139 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 void341capincci_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_MIDDLEWARE376static 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_MIDDLEWARE578 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 field587 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_MIDDLEWARE600 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_t652capi_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_t687capi_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_t742capi_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 int758capi_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 else889 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_MIDDLEWARE900 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 long947capi_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_COMPAT959static long960capi_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#endif985 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 .read = capi_read,1028 .write = capi_write,1029 .poll = capi_poll,1030 .unlocked_ioctl = capi_unlocked_ioctl,1031#ifdef CONFIG_COMPAT1032 .compat_ioctl = capi_compat_ioctl,1033#endif1034 .open = capi_open,1035 .release = capi_release,1036};1037 1038#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE1039/* -------- tty_operations for capincci ----------------------------- */1040 1041static int1042capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)1043{1044 struct capiminor *mp = capiminor_get(tty->index);1045 int ret = tty_standard_install(driver, tty);1046 1047 if (ret == 0)1048 tty->driver_data = mp;1049 else1050 capiminor_put(mp);1051 return ret;1052}1053 1054static void capinc_tty_cleanup(struct tty_struct *tty)1055{1056 struct capiminor *mp = tty->driver_data;1057 tty->driver_data = NULL;1058 capiminor_put(mp);1059}1060 1061static int capinc_tty_open(struct tty_struct *tty, struct file *filp)1062{1063 struct capiminor *mp = tty->driver_data;1064 int err;1065 1066 err = tty_port_open(&mp->port, tty, filp);1067 if (err)1068 return err;1069 1070 handle_minor_recv(mp);1071 return 0;1072}1073 1074static void capinc_tty_close(struct tty_struct *tty, struct file *filp)1075{1076 struct capiminor *mp = tty->driver_data;1077 1078 tty_port_close(&mp->port, tty, filp);1079}1080 1081static ssize_t capinc_tty_write(struct tty_struct *tty, const u8 *buf,1082 size_t count)1083{1084 struct capiminor *mp = tty->driver_data;1085 struct sk_buff *skb;1086 1087 pr_debug("capinc_tty_write(count=%zu)\n", count);1088 1089 spin_lock_bh(&mp->outlock);1090 skb = mp->outskb;1091 if (skb) {1092 mp->outskb = NULL;1093 __skb_queue_tail(&mp->outqueue, skb);1094 mp->outbytes += skb->len;1095 }1096 1097 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);1098 if (!skb) {1099 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");1100 spin_unlock_bh(&mp->outlock);1101 return -ENOMEM;1102 }1103 1104 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);1105 skb_put_data(skb, buf, count);1106 1107 __skb_queue_tail(&mp->outqueue, skb);1108 mp->outbytes += skb->len;1109 spin_unlock_bh(&mp->outlock);1110 1111 handle_minor_send(mp);1112 1113 return count;1114}1115 1116static int capinc_tty_put_char(struct tty_struct *tty, u8 ch)1117{1118 struct capiminor *mp = tty->driver_data;1119 bool invoke_send = false;1120 struct sk_buff *skb;1121 int ret = 1;1122 1123 pr_debug("capinc_put_char(%u)\n", ch);1124 1125 spin_lock_bh(&mp->outlock);1126 skb = mp->outskb;1127 if (skb) {1128 if (skb_tailroom(skb) > 0) {1129 skb_put_u8(skb, ch);1130 goto unlock_out;1131 }1132 mp->outskb = NULL;1133 __skb_queue_tail(&mp->outqueue, skb);1134 mp->outbytes += skb->len;1135 invoke_send = true;1136 }1137 1138 skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);1139 if (skb) {1140 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);1141 skb_put_u8(skb, ch);1142 mp->outskb = skb;1143 } else {1144 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);1145 ret = 0;1146 }1147 1148unlock_out:1149 spin_unlock_bh(&mp->outlock);1150 1151 if (invoke_send)1152 handle_minor_send(mp);1153 1154 return ret;1155}1156 1157static void capinc_tty_flush_chars(struct tty_struct *tty)1158{1159 struct capiminor *mp = tty->driver_data;1160 struct sk_buff *skb;1161 1162 spin_lock_bh(&mp->outlock);1163 skb = mp->outskb;1164 if (skb) {1165 mp->outskb = NULL;1166 __skb_queue_tail(&mp->outqueue, skb);1167 mp->outbytes += skb->len;1168 spin_unlock_bh(&mp->outlock);1169 1170 handle_minor_send(mp);1171 } else1172 spin_unlock_bh(&mp->outlock);1173 1174 handle_minor_recv(mp);1175}1176 1177static unsigned int capinc_tty_write_room(struct tty_struct *tty)1178{1179 struct capiminor *mp = tty->driver_data;1180 unsigned int room;1181 1182 room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);1183 room *= CAPI_MAX_BLKSIZE;1184 pr_debug("capinc_tty_write_room = %u\n", room);1185 return room;1186}1187 1188static unsigned int capinc_tty_chars_in_buffer(struct tty_struct *tty)1189{1190 struct capiminor *mp = tty->driver_data;1191 1192 pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",1193 mp->outbytes, mp->nack,1194 skb_queue_len(&mp->outqueue),1195 skb_queue_len(&mp->inqueue));1196 return mp->outbytes;1197}1198 1199static void capinc_tty_throttle(struct tty_struct *tty)1200{1201 struct capiminor *mp = tty->driver_data;1202 mp->ttyinstop = 1;1203}1204 1205static void capinc_tty_unthrottle(struct tty_struct *tty)1206{1207 struct capiminor *mp = tty->driver_data;1208 1209 mp->ttyinstop = 0;1210 handle_minor_recv(mp);1211}1212 1213static void capinc_tty_stop(struct tty_struct *tty)1214{1215 struct capiminor *mp = tty->driver_data;1216 1217 mp->ttyoutstop = 1;1218}1219 1220static void capinc_tty_start(struct tty_struct *tty)1221{1222 struct capiminor *mp = tty->driver_data;1223 1224 mp->ttyoutstop = 0;1225 handle_minor_send(mp);1226}1227 1228static void capinc_tty_hangup(struct tty_struct *tty)1229{1230 struct capiminor *mp = tty->driver_data;1231 1232 tty_port_hangup(&mp->port);1233}1234 1235static void capinc_tty_send_xchar(struct tty_struct *tty, u8 ch)1236{1237 pr_debug("capinc_tty_send_xchar(%u)\n", ch);1238}1239 1240static const struct tty_operations capinc_ops = {1241 .open = capinc_tty_open,1242 .close = capinc_tty_close,1243 .write = capinc_tty_write,1244 .put_char = capinc_tty_put_char,1245 .flush_chars = capinc_tty_flush_chars,1246 .write_room = capinc_tty_write_room,1247 .chars_in_buffer = capinc_tty_chars_in_buffer,1248 .throttle = capinc_tty_throttle,1249 .unthrottle = capinc_tty_unthrottle,1250 .stop = capinc_tty_stop,1251 .start = capinc_tty_start,1252 .hangup = capinc_tty_hangup,1253 .send_xchar = capinc_tty_send_xchar,1254 .install = capinc_tty_install,1255 .cleanup = capinc_tty_cleanup,1256};1257 1258static int __init capinc_tty_init(void)1259{1260 struct tty_driver *drv;1261 int err;1262 1263 if (capi_ttyminors > CAPINC_MAX_PORTS)1264 capi_ttyminors = CAPINC_MAX_PORTS;1265 if (capi_ttyminors <= 0)1266 capi_ttyminors = CAPINC_NR_PORTS;1267 1268 capiminors = kcalloc(capi_ttyminors, sizeof(struct capiminor *),1269 GFP_KERNEL);1270 if (!capiminors)1271 return -ENOMEM;1272 1273 drv = tty_alloc_driver(capi_ttyminors, TTY_DRIVER_REAL_RAW |1274 TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV);1275 if (IS_ERR(drv)) {1276 kfree(capiminors);1277 return PTR_ERR(drv);1278 }1279 drv->driver_name = "capi_nc";1280 drv->name = "capi!";1281 drv->major = 0;1282 drv->minor_start = 0;1283 drv->type = TTY_DRIVER_TYPE_SERIAL;1284 drv->subtype = SERIAL_TYPE_NORMAL;1285 drv->init_termios = tty_std_termios;1286 drv->init_termios.c_iflag = ICRNL;1287 drv->init_termios.c_oflag = OPOST | ONLCR;1288 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;1289 drv->init_termios.c_lflag = 0;1290 tty_set_operations(drv, &capinc_ops);1291 1292 err = tty_register_driver(drv);1293 if (err) {1294 tty_driver_kref_put(drv);1295 kfree(capiminors);1296 printk(KERN_ERR "Couldn't register capi_nc driver\n");1297 return err;1298 }1299 capinc_tty_driver = drv;1300 return 0;1301}1302 1303static void __exit capinc_tty_exit(void)1304{1305 tty_unregister_driver(capinc_tty_driver);1306 tty_driver_kref_put(capinc_tty_driver);1307 kfree(capiminors);1308}1309 1310#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */1311 1312static inline int capinc_tty_init(void)1313{1314 return 0;1315}1316 1317static inline void capinc_tty_exit(void) { }1318 1319#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */1320 1321/* -------- /proc functions ----------------------------------------- */1322 1323/*1324 * /proc/capi/capi20:1325 * minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt1326 */1327static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v)1328{1329 struct capidev *cdev;1330 struct list_head *l;1331 1332 mutex_lock(&capidev_list_lock);1333 list_for_each(l, &capidev_list) {1334 cdev = list_entry(l, struct capidev, list);1335 seq_printf(m, "0 %d %lu %lu %lu %lu\n",1336 cdev->ap.applid,1337 cdev->ap.nrecvctlpkt,1338 cdev->ap.nrecvdatapkt,1339 cdev->ap.nsentctlpkt,1340 cdev->ap.nsentdatapkt);1341 }1342 mutex_unlock(&capidev_list_lock);1343 return 0;1344}1345 1346/*1347 * /proc/capi/capi20ncci:1348 * applid ncci1349 */1350static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v)1351{1352 struct capidev *cdev;1353 struct capincci *np;1354 1355 mutex_lock(&capidev_list_lock);1356 list_for_each_entry(cdev, &capidev_list, list) {1357 mutex_lock(&cdev->lock);1358 list_for_each_entry(np, &cdev->nccis, list)1359 seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);1360 mutex_unlock(&cdev->lock);1361 }1362 mutex_unlock(&capidev_list_lock);1363 return 0;1364}1365 1366static void __init proc_init(void)1367{1368 proc_create_single("capi/capi20", 0, NULL, capi20_proc_show);1369 proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show);1370}1371 1372static void __exit proc_exit(void)1373{1374 remove_proc_entry("capi/capi20", NULL);1375 remove_proc_entry("capi/capi20ncci", NULL);1376}1377 1378/* -------- init function and module interface ---------------------- */1379 1380 1381static int __init capi_init(void)1382{1383 const char *compileinfo;1384 int major_ret;1385 int ret;1386 1387 ret = kcapi_init();1388 if (ret)1389 return ret;1390 1391 major_ret = register_chrdev(capi_major, "capi20", &capi_fops);1392 if (major_ret < 0) {1393 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);1394 kcapi_exit();1395 return major_ret;1396 }1397 1398 ret = class_register(&capi_class);1399 if (ret) {1400 unregister_chrdev(capi_major, "capi20");1401 kcapi_exit();1402 return ret;1403 }1404 1405 device_create(&capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");1406 1407 if (capinc_tty_init() < 0) {1408 device_destroy(&capi_class, MKDEV(capi_major, 0));1409 class_unregister(&capi_class);1410 unregister_chrdev(capi_major, "capi20");1411 kcapi_exit();1412 return -ENOMEM;1413 }1414 1415 proc_init();1416 1417#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE1418 compileinfo = " (middleware)";1419#else1420 compileinfo = " (no middleware)";1421#endif1422 printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",1423 capi_major, compileinfo);1424 1425 return 0;1426}1427 1428static void __exit capi_exit(void)1429{1430 proc_exit();1431 1432 device_destroy(&capi_class, MKDEV(capi_major, 0));1433 class_unregister(&capi_class);1434 unregister_chrdev(capi_major, "capi20");1435 1436 capinc_tty_exit();1437 1438 kcapi_exit();1439}1440 1441module_init(capi_init);1442module_exit(capi_exit);1443