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linuxdebug/drivers/isdn/capi/capi.c

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null pointer error
2024-07-16 15:50:57 +02:00
/* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
*
* CAPI 2.0 Interface for Linux
*
* Copyright 1996 by Carsten Paeth <calle@calle.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
*/
#include <linux/compiler.h>
#include <linux/module.h>
#include <linux/ethtool.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/signal.h>
#include <linux/mutex.h>
#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/tty.h>
#include <linux/netdevice.h>
#include <linux/ppp_defs.h>
#include <linux/ppp-ioctl.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
#include <linux/capi.h>
#include <linux/kernelcapi.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/moduleparam.h>
#include <linux/isdn/capiutil.h>
#include <linux/isdn/capicmd.h>
#include "kcapi.h"
MODULE_DESCRIPTION("CAPI4Linux: kernel CAPI layer and /dev/capi20 interface");
MODULE_AUTHOR("Carsten Paeth");
MODULE_LICENSE("GPL");
/* -------- driver information -------------------------------------- */
static DEFINE_MUTEX(capi_mutex);
static struct class *capi_class;
static int capi_major = 68; /* allocated */
module_param_named(major, capi_major, uint, 0);
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
#define CAPINC_NR_PORTS 32
#define CAPINC_MAX_PORTS 256
static int capi_ttyminors = CAPINC_NR_PORTS;
module_param_named(ttyminors, capi_ttyminors, uint, 0);
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
/* -------- defines ------------------------------------------------- */
#define CAPINC_MAX_RECVQUEUE 10
#define CAPINC_MAX_SENDQUEUE 10
#define CAPI_MAX_BLKSIZE 2048
/* -------- data structures ----------------------------------------- */
struct capidev;
struct capincci;
struct capiminor;
struct ackqueue_entry {
struct list_head list;
u16 datahandle;
};
struct capiminor {
unsigned int minor;
struct capi20_appl *ap;
u32 ncci;
atomic_t datahandle;
atomic_t msgid;
struct tty_port port;
int ttyinstop;
int ttyoutstop;
struct sk_buff_head inqueue;
struct sk_buff_head outqueue;
int outbytes;
struct sk_buff *outskb;
spinlock_t outlock;
/* transmit path */
struct list_head ackqueue;
int nack;
spinlock_t ackqlock;
};
struct capincci {
struct list_head list;
u32 ncci;
struct capidev *cdev;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
struct capiminor *minorp;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
};
struct capidev {
struct list_head list;
struct capi20_appl ap;
u16 errcode;
unsigned userflags;
struct sk_buff_head recvqueue;
wait_queue_head_t recvwait;
struct list_head nccis;
struct mutex lock;
};
/* -------- global variables ---------------------------------------- */
static DEFINE_MUTEX(capidev_list_lock);
static LIST_HEAD(capidev_list);
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
static DEFINE_SPINLOCK(capiminors_lock);
static struct capiminor **capiminors;
static struct tty_driver *capinc_tty_driver;
/* -------- datahandles --------------------------------------------- */
static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
{
struct ackqueue_entry *n;
n = kmalloc(sizeof(*n), GFP_ATOMIC);
if (unlikely(!n)) {
printk(KERN_ERR "capi: alloc datahandle failed\n");
return -1;
}
n->datahandle = datahandle;
INIT_LIST_HEAD(&n->list);
spin_lock_bh(&mp->ackqlock);
list_add_tail(&n->list, &mp->ackqueue);
mp->nack++;
spin_unlock_bh(&mp->ackqlock);
return 0;
}
static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
{
struct ackqueue_entry *p, *tmp;
spin_lock_bh(&mp->ackqlock);
list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
if (p->datahandle == datahandle) {
list_del(&p->list);
mp->nack--;
spin_unlock_bh(&mp->ackqlock);
kfree(p);
return 0;
}
}
spin_unlock_bh(&mp->ackqlock);
return -1;
}
static void capiminor_del_all_ack(struct capiminor *mp)
{
struct ackqueue_entry *p, *tmp;
list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
list_del(&p->list);
kfree(p);
mp->nack--;
}
}
/* -------- struct capiminor ---------------------------------------- */
static void capiminor_destroy(struct tty_port *port)
{
struct capiminor *mp = container_of(port, struct capiminor, port);
kfree_skb(mp->outskb);
skb_queue_purge(&mp->inqueue);
skb_queue_purge(&mp->outqueue);
capiminor_del_all_ack(mp);
kfree(mp);
}
static const struct tty_port_operations capiminor_port_ops = {
.destruct = capiminor_destroy,
};
static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
{
struct capiminor *mp;
struct device *dev;
unsigned int minor;
mp = kzalloc(sizeof(*mp), GFP_KERNEL);
if (!mp) {
printk(KERN_ERR "capi: can't alloc capiminor\n");
return NULL;
}
mp->ap = ap;
mp->ncci = ncci;
INIT_LIST_HEAD(&mp->ackqueue);
spin_lock_init(&mp->ackqlock);
skb_queue_head_init(&mp->inqueue);
skb_queue_head_init(&mp->outqueue);
spin_lock_init(&mp->outlock);
tty_port_init(&mp->port);
mp->port.ops = &capiminor_port_ops;
/* Allocate the least unused minor number. */
spin_lock(&capiminors_lock);
for (minor = 0; minor < capi_ttyminors; minor++)
if (!capiminors[minor]) {
capiminors[minor] = mp;
break;
}
spin_unlock(&capiminors_lock);
if (minor == capi_ttyminors) {
printk(KERN_NOTICE "capi: out of minors\n");
goto err_out1;
}
mp->minor = minor;
dev = tty_port_register_device(&mp->port, capinc_tty_driver, minor,
NULL);
if (IS_ERR(dev))
goto err_out2;
return mp;
err_out2:
spin_lock(&capiminors_lock);
capiminors[minor] = NULL;
spin_unlock(&capiminors_lock);
err_out1:
tty_port_put(&mp->port);
return NULL;
}
static struct capiminor *capiminor_get(unsigned int minor)
{
struct capiminor *mp;
spin_lock(&capiminors_lock);
mp = capiminors[minor];
if (mp)
tty_port_get(&mp->port);
spin_unlock(&capiminors_lock);
return mp;
}
static inline void capiminor_put(struct capiminor *mp)
{
tty_port_put(&mp->port);
}
static void capiminor_free(struct capiminor *mp)
{
tty_unregister_device(capinc_tty_driver, mp->minor);
spin_lock(&capiminors_lock);
capiminors[mp->minor] = NULL;
spin_unlock(&capiminors_lock);
capiminor_put(mp);
}
/* -------- struct capincci ----------------------------------------- */
static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
{
if (cdev->userflags & CAPIFLAG_HIGHJACKING)
np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
}
static void capincci_free_minor(struct capincci *np)
{
struct capiminor *mp = np->minorp;
struct tty_struct *tty;
if (mp) {
tty = tty_port_tty_get(&mp->port);
if (tty) {
tty_vhangup(tty);
tty_kref_put(tty);
}
capiminor_free(mp);
}
}
static inline unsigned int capincci_minor_opencount(struct capincci *np)
{
struct capiminor *mp = np->minorp;
unsigned int count = 0;
struct tty_struct *tty;
if (mp) {
tty = tty_port_tty_get(&mp->port);
if (tty) {
count = tty->count;
tty_kref_put(tty);
}
}
return count;
}
#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
static inline void
capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
static inline void capincci_free_minor(struct capincci *np) { }
#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
{
struct capincci *np;
np = kzalloc(sizeof(*np), GFP_KERNEL);
if (!np)
return NULL;
np->ncci = ncci;
np->cdev = cdev;
capincci_alloc_minor(cdev, np);
list_add_tail(&np->list, &cdev->nccis);
return np;
}
static void capincci_free(struct capidev *cdev, u32 ncci)
{
struct capincci *np, *tmp;
list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
if (ncci == 0xffffffff || np->ncci == ncci) {
capincci_free_minor(np);
list_del(&np->list);
kfree(np);
}
}
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
{
struct capincci *np;
list_for_each_entry(np, &cdev->nccis, list)
if (np->ncci == ncci)
return np;
return NULL;
}
/* -------- handle data queue --------------------------------------- */
static struct sk_buff *
gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
{
struct sk_buff *nskb;
nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_KERNEL);
if (nskb) {
u16 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
capimsg_setu16(s, 2, mp->ap->applid);
capimsg_setu8 (s, 4, CAPI_DATA_B3);
capimsg_setu8 (s, 5, CAPI_RESP);
capimsg_setu16(s, 6, atomic_inc_return(&mp->msgid));
capimsg_setu32(s, 8, mp->ncci);
capimsg_setu16(s, 12, datahandle);
}
return nskb;
}
static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
{
unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
struct tty_struct *tty;
struct sk_buff *nskb;
u16 errcode, datahandle;
struct tty_ldisc *ld;
int ret = -1;
tty = tty_port_tty_get(&mp->port);
if (!tty) {
pr_debug("capi: currently no receiver\n");
return -1;
}
ld = tty_ldisc_ref(tty);
if (!ld) {
/* fatal error, do not requeue */
ret = 0;
kfree_skb(skb);
goto deref_tty;
}
if (ld->ops->receive_buf == NULL) {
pr_debug("capi: ldisc has no receive_buf function\n");
/* fatal error, do not requeue */
goto free_skb;
}
if (mp->ttyinstop) {
pr_debug("capi: recv tty throttled\n");
goto deref_ldisc;
}
if (tty->receive_room < datalen) {
pr_debug("capi: no room in tty\n");
goto deref_ldisc;
}
nskb = gen_data_b3_resp_for(mp, skb);
if (!nskb) {
printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
goto deref_ldisc;
}
datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
errcode = capi20_put_message(mp->ap, nskb);
if (errcode == CAPI_NOERROR) {
skb_pull(skb, CAPIMSG_LEN(skb->data));
pr_debug("capi: DATA_B3_RESP %u len=%d => ldisc\n",
datahandle, skb->len);
ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
} else {
printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
errcode);
kfree_skb(nskb);
if (errcode == CAPI_SENDQUEUEFULL)
goto deref_ldisc;
}
free_skb:
ret = 0;
kfree_skb(skb);
deref_ldisc:
tty_ldisc_deref(ld);
deref_tty:
tty_kref_put(tty);
return ret;
}
static void handle_minor_recv(struct capiminor *mp)
{
struct sk_buff *skb;
while ((skb = skb_dequeue(&mp->inqueue)) != NULL)
if (handle_recv_skb(mp, skb) < 0) {
skb_queue_head(&mp->inqueue, skb);
return;
}
}
static void handle_minor_send(struct capiminor *mp)
{
struct tty_struct *tty;
struct sk_buff *skb;
u16 len;
u16 errcode;
u16 datahandle;
tty = tty_port_tty_get(&mp->port);
if (!tty)
return;
if (mp->ttyoutstop) {
pr_debug("capi: send: tty stopped\n");
tty_kref_put(tty);
return;
}
while (1) {
spin_lock_bh(&mp->outlock);
skb = __skb_dequeue(&mp->outqueue);
if (!skb) {
spin_unlock_bh(&mp->outlock);
break;
}
len = (u16)skb->len;
mp->outbytes -= len;
spin_unlock_bh(&mp->outlock);
datahandle = atomic_inc_return(&mp->datahandle);
skb_push(skb, CAPI_DATA_B3_REQ_LEN);
memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
capimsg_setu16(skb->data, 2, mp->ap->applid);
capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
capimsg_setu8 (skb->data, 5, CAPI_REQ);
capimsg_setu16(skb->data, 6, atomic_inc_return(&mp->msgid));
capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
capimsg_setu16(skb->data, 16, len); /* Data length */
capimsg_setu16(skb->data, 18, datahandle);
capimsg_setu16(skb->data, 20, 0); /* Flags */
if (capiminor_add_ack(mp, datahandle) < 0) {
skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
spin_lock_bh(&mp->outlock);
__skb_queue_head(&mp->outqueue, skb);
mp->outbytes += len;
spin_unlock_bh(&mp->outlock);
break;
}
errcode = capi20_put_message(mp->ap, skb);
if (errcode == CAPI_NOERROR) {
pr_debug("capi: DATA_B3_REQ %u len=%u\n",
datahandle, len);
continue;
}
capiminor_del_ack(mp, datahandle);
if (errcode == CAPI_SENDQUEUEFULL) {
skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
spin_lock_bh(&mp->outlock);
__skb_queue_head(&mp->outqueue, skb);
mp->outbytes += len;
spin_unlock_bh(&mp->outlock);
break;
}
/* ups, drop packet */
printk(KERN_ERR "capi: put_message = %x\n", errcode);
kfree_skb(skb);
}
tty_kref_put(tty);
}
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
/* -------- function called by lower level -------------------------- */
static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
{
struct capidev *cdev = ap->private;
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
struct capiminor *mp;
u16 datahandle;
struct capincci *np;
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
mutex_lock(&cdev->lock);
if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
u16 info = CAPIMSG_U16(skb->data, 12); // Info field
if ((info & 0xff00) == 0)
capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
}
if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
goto unlock_out;
}
#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
if (!np) {
printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
goto unlock_out;
}
mp = np->minorp;
if (!mp) {
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
goto unlock_out;
}
if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 4 + 2);
pr_debug("capi_signal: DATA_B3_IND %u len=%d\n",
datahandle, skb->len-CAPIMSG_LEN(skb->data));
skb_queue_tail(&mp->inqueue, skb);
handle_minor_recv(mp);
} else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
pr_debug("capi_signal: DATA_B3_CONF %u 0x%x\n",
datahandle,
CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4 + 2));
kfree_skb(skb);
capiminor_del_ack(mp, datahandle);
tty_port_tty_wakeup(&mp->port);
handle_minor_send(mp);
} else {
/* ups, let capi application handle it :-) */
skb_queue_tail(&cdev->recvqueue, skb);
wake_up_interruptible(&cdev->recvwait);
}
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
unlock_out:
mutex_unlock(&cdev->lock);
}
/* -------- file_operations for capidev ----------------------------- */
static ssize_t
capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
struct capidev *cdev = file->private_data;
struct sk_buff *skb;
size_t copied;
int err;
if (!cdev->ap.applid)
return -ENODEV;
skb = skb_dequeue(&cdev->recvqueue);
if (!skb) {
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
err = wait_event_interruptible(cdev->recvwait,
(skb = skb_dequeue(&cdev->recvqueue)));
if (err)
return err;
}
if (skb->len > count) {
skb_queue_head(&cdev->recvqueue, skb);
return -EMSGSIZE;
}
if (copy_to_user(buf, skb->data, skb->len)) {
skb_queue_head(&cdev->recvqueue, skb);
return -EFAULT;
}
copied = skb->len;
kfree_skb(skb);
return copied;
}
static ssize_t
capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
struct capidev *cdev = file->private_data;
struct sk_buff *skb;
u16 mlen;
if (!cdev->ap.applid)
return -ENODEV;
if (count < CAPIMSG_BASELEN)
return -EINVAL;
skb = alloc_skb(count, GFP_USER);
if (!skb)
return -ENOMEM;
if (copy_from_user(skb_put(skb, count), buf, count)) {
kfree_skb(skb);
return -EFAULT;
}
mlen = CAPIMSG_LEN(skb->data);
if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
if (count < CAPI_DATA_B3_REQ_LEN ||
(size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
kfree_skb(skb);
return -EINVAL;
}
} else {
if (mlen != count) {
kfree_skb(skb);
return -EINVAL;
}
}
CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
if (count < CAPI_DISCONNECT_B3_RESP_LEN) {
kfree_skb(skb);
return -EINVAL;
}
mutex_lock(&cdev->lock);
capincci_free(cdev, CAPIMSG_NCCI(skb->data));
mutex_unlock(&cdev->lock);
}
cdev->errcode = capi20_put_message(&cdev->ap, skb);
if (cdev->errcode) {
kfree_skb(skb);
return -EIO;
}
return count;
}
static __poll_t
capi_poll(struct file *file, poll_table *wait)
{
struct capidev *cdev = file->private_data;
__poll_t mask = 0;
if (!cdev->ap.applid)
return EPOLLERR;
poll_wait(file, &(cdev->recvwait), wait);
mask = EPOLLOUT | EPOLLWRNORM;
if (!skb_queue_empty_lockless(&cdev->recvqueue))
mask |= EPOLLIN | EPOLLRDNORM;
return mask;
}
static int
capi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct capidev *cdev = file->private_data;
capi_ioctl_struct data;
int retval = -EINVAL;
void __user *argp = (void __user *)arg;
switch (cmd) {
case CAPI_REGISTER:
mutex_lock(&cdev->lock);
if (cdev->ap.applid) {
retval = -EEXIST;
goto register_out;
}
if (copy_from_user(&cdev->ap.rparam, argp,
sizeof(struct capi_register_params))) {
retval = -EFAULT;
goto register_out;
}
cdev->ap.private = cdev;
cdev->ap.recv_message = capi_recv_message;
cdev->errcode = capi20_register(&cdev->ap);
retval = (int)cdev->ap.applid;
if (cdev->errcode) {
cdev->ap.applid = 0;
retval = -EIO;
}
register_out:
mutex_unlock(&cdev->lock);
return retval;
case CAPI_GET_VERSION:
if (copy_from_user(&data.contr, argp,
sizeof(data.contr)))
return -EFAULT;
cdev->errcode = capi20_get_version(data.contr, &data.version);
if (cdev->errcode)
return -EIO;
if (copy_to_user(argp, &data.version,
sizeof(data.version)))
return -EFAULT;
return 0;
case CAPI_GET_SERIAL:
if (copy_from_user(&data.contr, argp,
sizeof(data.contr)))
return -EFAULT;
cdev->errcode = capi20_get_serial(data.contr, data.serial);
if (cdev->errcode)
return -EIO;
if (copy_to_user(argp, data.serial,
sizeof(data.serial)))
return -EFAULT;
return 0;
case CAPI_GET_PROFILE:
if (copy_from_user(&data.contr, argp,
sizeof(data.contr)))
return -EFAULT;
if (data.contr == 0) {
cdev->errcode = capi20_get_profile(data.contr, &data.profile);
if (cdev->errcode)
return -EIO;
retval = copy_to_user(argp,
&data.profile.ncontroller,
sizeof(data.profile.ncontroller));
} else {
cdev->errcode = capi20_get_profile(data.contr, &data.profile);
if (cdev->errcode)
return -EIO;
retval = copy_to_user(argp, &data.profile,
sizeof(data.profile));
}
if (retval)
return -EFAULT;
return 0;
case CAPI_GET_MANUFACTURER:
if (copy_from_user(&data.contr, argp,
sizeof(data.contr)))
return -EFAULT;
cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
if (cdev->errcode)
return -EIO;
if (copy_to_user(argp, data.manufacturer,
sizeof(data.manufacturer)))
return -EFAULT;
return 0;
case CAPI_GET_ERRCODE:
data.errcode = cdev->errcode;
cdev->errcode = CAPI_NOERROR;
if (arg) {
if (copy_to_user(argp, &data.errcode,
sizeof(data.errcode)))
return -EFAULT;
}
return data.errcode;
case CAPI_INSTALLED:
if (capi20_isinstalled() == CAPI_NOERROR)
return 0;
return -ENXIO;
case CAPI_MANUFACTURER_CMD: {
struct capi_manufacturer_cmd mcmd;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
return -EFAULT;
return capi20_manufacturer(mcmd.cmd, mcmd.data);
}
case CAPI_SET_FLAGS:
case CAPI_CLR_FLAGS: {
unsigned userflags;
if (copy_from_user(&userflags, argp, sizeof(userflags)))
return -EFAULT;
mutex_lock(&cdev->lock);
if (cmd == CAPI_SET_FLAGS)
cdev->userflags |= userflags;
else
cdev->userflags &= ~userflags;
mutex_unlock(&cdev->lock);
return 0;
}
case CAPI_GET_FLAGS:
if (copy_to_user(argp, &cdev->userflags,
sizeof(cdev->userflags)))
return -EFAULT;
return 0;
#ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
case CAPI_NCCI_OPENCOUNT:
return 0;
#else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
case CAPI_NCCI_OPENCOUNT: {
struct capincci *nccip;
unsigned ncci;
int count = 0;
if (copy_from_user(&ncci, argp, sizeof(ncci)))
return -EFAULT;
mutex_lock(&cdev->lock);
nccip = capincci_find(cdev, (u32)ncci);
if (nccip)
count = capincci_minor_opencount(nccip);
mutex_unlock(&cdev->lock);
return count;
}
case CAPI_NCCI_GETUNIT: {
struct capincci *nccip;
struct capiminor *mp;
unsigned ncci;
int unit = -ESRCH;
if (copy_from_user(&ncci, argp, sizeof(ncci)))
return -EFAULT;
mutex_lock(&cdev->lock);
nccip = capincci_find(cdev, (u32)ncci);
if (nccip) {
mp = nccip->minorp;
if (mp)
unit = mp->minor;
}
mutex_unlock(&cdev->lock);
return unit;
}
#endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
default:
return -EINVAL;
}
}
static long
capi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int ret;
mutex_lock(&capi_mutex);
ret = capi_ioctl(file, cmd, arg);
mutex_unlock(&capi_mutex);
return ret;
}
#ifdef CONFIG_COMPAT
static long
capi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int ret;
if (cmd == CAPI_MANUFACTURER_CMD) {
struct {
compat_ulong_t cmd;
compat_uptr_t data;
} mcmd32;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&mcmd32, compat_ptr(arg), sizeof(mcmd32)))
return -EFAULT;
mutex_lock(&capi_mutex);
ret = capi20_manufacturer(mcmd32.cmd, compat_ptr(mcmd32.data));
mutex_unlock(&capi_mutex);
return ret;
}
return capi_unlocked_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
}
#endif
static int capi_open(struct inode *inode, struct file *file)
{
struct capidev *cdev;
cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
if (!cdev)
return -ENOMEM;
mutex_init(&cdev->lock);
skb_queue_head_init(&cdev->recvqueue);
init_waitqueue_head(&cdev->recvwait);
INIT_LIST_HEAD(&cdev->nccis);
file->private_data = cdev;
mutex_lock(&capidev_list_lock);
list_add_tail(&cdev->list, &capidev_list);
mutex_unlock(&capidev_list_lock);
return stream_open(inode, file);
}
static int capi_release(struct inode *inode, struct file *file)
{
struct capidev *cdev = file->private_data;
mutex_lock(&capidev_list_lock);
list_del(&cdev->list);
mutex_unlock(&capidev_list_lock);
if (cdev->ap.applid)
capi20_release(&cdev->ap);
skb_queue_purge(&cdev->recvqueue);
capincci_free(cdev, 0xffffffff);
kfree(cdev);
return 0;
}
static const struct file_operations capi_fops =
{
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = capi_read,
.write = capi_write,
.poll = capi_poll,
.unlocked_ioctl = capi_unlocked_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = capi_compat_ioctl,
#endif
.open = capi_open,
.release = capi_release,
};
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
/* -------- tty_operations for capincci ----------------------------- */
static int
capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
{
struct capiminor *mp = capiminor_get(tty->index);
int ret = tty_standard_install(driver, tty);
if (ret == 0)
tty->driver_data = mp;
else
capiminor_put(mp);
return ret;
}
static void capinc_tty_cleanup(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
tty->driver_data = NULL;
capiminor_put(mp);
}
static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
{
struct capiminor *mp = tty->driver_data;
int err;
err = tty_port_open(&mp->port, tty, filp);
if (err)
return err;
handle_minor_recv(mp);
return 0;
}
static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
{
struct capiminor *mp = tty->driver_data;
tty_port_close(&mp->port, tty, filp);
}
static int capinc_tty_write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
struct capiminor *mp = tty->driver_data;
struct sk_buff *skb;
pr_debug("capinc_tty_write(count=%d)\n", count);
spin_lock_bh(&mp->outlock);
skb = mp->outskb;
if (skb) {
mp->outskb = NULL;
__skb_queue_tail(&mp->outqueue, skb);
mp->outbytes += skb->len;
}
skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + count, GFP_ATOMIC);
if (!skb) {
printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
spin_unlock_bh(&mp->outlock);
return -ENOMEM;
}
skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
skb_put_data(skb, buf, count);
__skb_queue_tail(&mp->outqueue, skb);
mp->outbytes += skb->len;
spin_unlock_bh(&mp->outlock);
handle_minor_send(mp);
return count;
}
static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
{
struct capiminor *mp = tty->driver_data;
bool invoke_send = false;
struct sk_buff *skb;
int ret = 1;
pr_debug("capinc_put_char(%u)\n", ch);
spin_lock_bh(&mp->outlock);
skb = mp->outskb;
if (skb) {
if (skb_tailroom(skb) > 0) {
skb_put_u8(skb, ch);
goto unlock_out;
}
mp->outskb = NULL;
__skb_queue_tail(&mp->outqueue, skb);
mp->outbytes += skb->len;
invoke_send = true;
}
skb = alloc_skb(CAPI_DATA_B3_REQ_LEN + CAPI_MAX_BLKSIZE, GFP_ATOMIC);
if (skb) {
skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
skb_put_u8(skb, ch);
mp->outskb = skb;
} else {
printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
ret = 0;
}
unlock_out:
spin_unlock_bh(&mp->outlock);
if (invoke_send)
handle_minor_send(mp);
return ret;
}
static void capinc_tty_flush_chars(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
struct sk_buff *skb;
spin_lock_bh(&mp->outlock);
skb = mp->outskb;
if (skb) {
mp->outskb = NULL;
__skb_queue_tail(&mp->outqueue, skb);
mp->outbytes += skb->len;
spin_unlock_bh(&mp->outlock);
handle_minor_send(mp);
} else
spin_unlock_bh(&mp->outlock);
handle_minor_recv(mp);
}
static unsigned int capinc_tty_write_room(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
unsigned int room;
room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
room *= CAPI_MAX_BLKSIZE;
pr_debug("capinc_tty_write_room = %u\n", room);
return room;
}
static unsigned int capinc_tty_chars_in_buffer(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
pr_debug("capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
mp->outbytes, mp->nack,
skb_queue_len(&mp->outqueue),
skb_queue_len(&mp->inqueue));
return mp->outbytes;
}
static void capinc_tty_throttle(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
mp->ttyinstop = 1;
}
static void capinc_tty_unthrottle(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
mp->ttyinstop = 0;
handle_minor_recv(mp);
}
static void capinc_tty_stop(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
mp->ttyoutstop = 1;
}
static void capinc_tty_start(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
mp->ttyoutstop = 0;
handle_minor_send(mp);
}
static void capinc_tty_hangup(struct tty_struct *tty)
{
struct capiminor *mp = tty->driver_data;
tty_port_hangup(&mp->port);
}
static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
{
pr_debug("capinc_tty_send_xchar(%d)\n", ch);
}
static const struct tty_operations capinc_ops = {
.open = capinc_tty_open,
.close = capinc_tty_close,
.write = capinc_tty_write,
.put_char = capinc_tty_put_char,
.flush_chars = capinc_tty_flush_chars,
.write_room = capinc_tty_write_room,
.chars_in_buffer = capinc_tty_chars_in_buffer,
.throttle = capinc_tty_throttle,
.unthrottle = capinc_tty_unthrottle,
.stop = capinc_tty_stop,
.start = capinc_tty_start,
.hangup = capinc_tty_hangup,
.send_xchar = capinc_tty_send_xchar,
.install = capinc_tty_install,
.cleanup = capinc_tty_cleanup,
};
static int __init capinc_tty_init(void)
{
struct tty_driver *drv;
int err;
if (capi_ttyminors > CAPINC_MAX_PORTS)
capi_ttyminors = CAPINC_MAX_PORTS;
if (capi_ttyminors <= 0)
capi_ttyminors = CAPINC_NR_PORTS;
capiminors = kcalloc(capi_ttyminors, sizeof(struct capiminor *),
GFP_KERNEL);
if (!capiminors)
return -ENOMEM;
drv = tty_alloc_driver(capi_ttyminors, TTY_DRIVER_REAL_RAW |
TTY_DRIVER_RESET_TERMIOS | TTY_DRIVER_DYNAMIC_DEV);
if (IS_ERR(drv)) {
kfree(capiminors);
return PTR_ERR(drv);
}
drv->driver_name = "capi_nc";
drv->name = "capi!";
drv->major = 0;
drv->minor_start = 0;
drv->type = TTY_DRIVER_TYPE_SERIAL;
drv->subtype = SERIAL_TYPE_NORMAL;
drv->init_termios = tty_std_termios;
drv->init_termios.c_iflag = ICRNL;
drv->init_termios.c_oflag = OPOST | ONLCR;
drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
drv->init_termios.c_lflag = 0;
tty_set_operations(drv, &capinc_ops);
err = tty_register_driver(drv);
if (err) {
tty_driver_kref_put(drv);
kfree(capiminors);
printk(KERN_ERR "Couldn't register capi_nc driver\n");
return err;
}
capinc_tty_driver = drv;
return 0;
}
static void __exit capinc_tty_exit(void)
{
tty_unregister_driver(capinc_tty_driver);
tty_driver_kref_put(capinc_tty_driver);
kfree(capiminors);
}
#else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
static inline int capinc_tty_init(void)
{
return 0;
}
static inline void capinc_tty_exit(void) { }
#endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
/* -------- /proc functions ----------------------------------------- */
/*
* /proc/capi/capi20:
* minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
*/
static int __maybe_unused capi20_proc_show(struct seq_file *m, void *v)
{
struct capidev *cdev;
struct list_head *l;
mutex_lock(&capidev_list_lock);
list_for_each(l, &capidev_list) {
cdev = list_entry(l, struct capidev, list);
seq_printf(m, "0 %d %lu %lu %lu %lu\n",
cdev->ap.applid,
cdev->ap.nrecvctlpkt,
cdev->ap.nrecvdatapkt,
cdev->ap.nsentctlpkt,
cdev->ap.nsentdatapkt);
}
mutex_unlock(&capidev_list_lock);
return 0;
}
/*
* /proc/capi/capi20ncci:
* applid ncci
*/
static int __maybe_unused capi20ncci_proc_show(struct seq_file *m, void *v)
{
struct capidev *cdev;
struct capincci *np;
mutex_lock(&capidev_list_lock);
list_for_each_entry(cdev, &capidev_list, list) {
mutex_lock(&cdev->lock);
list_for_each_entry(np, &cdev->nccis, list)
seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
mutex_unlock(&cdev->lock);
}
mutex_unlock(&capidev_list_lock);
return 0;
}
static void __init proc_init(void)
{
proc_create_single("capi/capi20", 0, NULL, capi20_proc_show);
proc_create_single("capi/capi20ncci", 0, NULL, capi20ncci_proc_show);
}
static void __exit proc_exit(void)
{
remove_proc_entry("capi/capi20", NULL);
remove_proc_entry("capi/capi20ncci", NULL);
}
/* -------- init function and module interface ---------------------- */
static int __init capi_init(void)
{
const char *compileinfo;
int major_ret;
int ret;
ret = kcapi_init();
if (ret)
return ret;
major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
if (major_ret < 0) {
printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
kcapi_exit();
return major_ret;
}
capi_class = class_create(THIS_MODULE, "capi");
if (IS_ERR(capi_class)) {
unregister_chrdev(capi_major, "capi20");
kcapi_exit();
return PTR_ERR(capi_class);
}
device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi20");
if (capinc_tty_init() < 0) {
device_destroy(capi_class, MKDEV(capi_major, 0));
class_destroy(capi_class);
unregister_chrdev(capi_major, "capi20");
kcapi_exit();
return -ENOMEM;
}
proc_init();
#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
compileinfo = " (middleware)";
#else
compileinfo = " (no middleware)";
#endif
printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
capi_major, compileinfo);
return 0;
}
static void __exit capi_exit(void)
{
proc_exit();
device_destroy(capi_class, MKDEV(capi_major, 0));
class_destroy(capi_class);
unregister_chrdev(capi_major, "capi20");
capinc_tty_exit();
kcapi_exit();
}
module_init(capi_init);
module_exit(capi_exit);