336 lines
8.8 KiB
C
336 lines
8.8 KiB
C
/* $Id: divert_procfs.c,v 1.11.6.2 2001/09/23 22:24:36 kai Exp $
|
|
*
|
|
* Filesystem handling for the diversion supplementary services.
|
|
*
|
|
* Copyright 1998 by Werner Cornelius (werner@isdn4linux.de)
|
|
*
|
|
* This software may be used and distributed according to the terms
|
|
* of the GNU General Public License, incorporated herein by reference.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/slab.h>
|
|
#ifdef CONFIG_PROC_FS
|
|
#include <linux/proc_fs.h>
|
|
#else
|
|
#include <linux/fs.h>
|
|
#endif
|
|
#include <linux/sched.h>
|
|
#include <linux/isdnif.h>
|
|
#include <net/net_namespace.h>
|
|
#include <linux/mutex.h>
|
|
#include "isdn_divert.h"
|
|
|
|
|
|
/*********************************/
|
|
/* Variables for interface queue */
|
|
/*********************************/
|
|
ulong if_used = 0; /* number of interface users */
|
|
static DEFINE_MUTEX(isdn_divert_mutex);
|
|
static struct divert_info *divert_info_head = NULL; /* head of queue */
|
|
static struct divert_info *divert_info_tail = NULL; /* pointer to last entry */
|
|
static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
|
|
static wait_queue_head_t rd_queue;
|
|
|
|
/*********************************/
|
|
/* put an info buffer into queue */
|
|
/*********************************/
|
|
void
|
|
put_info_buffer(char *cp)
|
|
{
|
|
struct divert_info *ib;
|
|
unsigned long flags;
|
|
|
|
if (if_used <= 0)
|
|
return;
|
|
if (!cp)
|
|
return;
|
|
if (!*cp)
|
|
return;
|
|
if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
|
|
return; /* no memory */
|
|
strcpy(ib->info_start, cp); /* set output string */
|
|
ib->next = NULL;
|
|
spin_lock_irqsave(&divert_info_lock, flags);
|
|
ib->usage_cnt = if_used;
|
|
if (!divert_info_head)
|
|
divert_info_head = ib; /* new head */
|
|
else
|
|
divert_info_tail->next = ib; /* follows existing messages */
|
|
divert_info_tail = ib; /* new tail */
|
|
|
|
/* delete old entrys */
|
|
while (divert_info_head->next) {
|
|
if ((divert_info_head->usage_cnt <= 0) &&
|
|
(divert_info_head->next->usage_cnt <= 0)) {
|
|
ib = divert_info_head;
|
|
divert_info_head = divert_info_head->next;
|
|
kfree(ib);
|
|
} else
|
|
break;
|
|
} /* divert_info_head->next */
|
|
spin_unlock_irqrestore(&divert_info_lock, flags);
|
|
wake_up_interruptible(&(rd_queue));
|
|
} /* put_info_buffer */
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
/**********************************/
|
|
/* deflection device read routine */
|
|
/**********************************/
|
|
static ssize_t
|
|
isdn_divert_read(struct file *file, char __user *buf, size_t count, loff_t *off)
|
|
{
|
|
struct divert_info *inf;
|
|
int len;
|
|
|
|
if (!*((struct divert_info **) file->private_data)) {
|
|
if (file->f_flags & O_NONBLOCK)
|
|
return -EAGAIN;
|
|
interruptible_sleep_on(&(rd_queue));
|
|
}
|
|
if (!(inf = *((struct divert_info **) file->private_data)))
|
|
return (0);
|
|
|
|
inf->usage_cnt--; /* new usage count */
|
|
file->private_data = &inf->next; /* next structure */
|
|
if ((len = strlen(inf->info_start)) <= count) {
|
|
if (copy_to_user(buf, inf->info_start, len))
|
|
return -EFAULT;
|
|
*off += len;
|
|
return (len);
|
|
}
|
|
return (0);
|
|
} /* isdn_divert_read */
|
|
|
|
/**********************************/
|
|
/* deflection device write routine */
|
|
/**********************************/
|
|
static ssize_t
|
|
isdn_divert_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
|
|
{
|
|
return (-ENODEV);
|
|
} /* isdn_divert_write */
|
|
|
|
|
|
/***************************************/
|
|
/* select routines for various kernels */
|
|
/***************************************/
|
|
static unsigned int
|
|
isdn_divert_poll(struct file *file, poll_table *wait)
|
|
{
|
|
unsigned int mask = 0;
|
|
|
|
poll_wait(file, &(rd_queue), wait);
|
|
/* mask = POLLOUT | POLLWRNORM; */
|
|
if (*((struct divert_info **) file->private_data)) {
|
|
mask |= POLLIN | POLLRDNORM;
|
|
}
|
|
return mask;
|
|
} /* isdn_divert_poll */
|
|
|
|
/****************/
|
|
/* Open routine */
|
|
/****************/
|
|
static int
|
|
isdn_divert_open(struct inode *ino, struct file *filep)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&divert_info_lock, flags);
|
|
if_used++;
|
|
if (divert_info_head)
|
|
filep->private_data = &(divert_info_tail->next);
|
|
else
|
|
filep->private_data = &divert_info_head;
|
|
spin_unlock_irqrestore(&divert_info_lock, flags);
|
|
/* start_divert(); */
|
|
return nonseekable_open(ino, filep);
|
|
} /* isdn_divert_open */
|
|
|
|
/*******************/
|
|
/* close routine */
|
|
/*******************/
|
|
static int
|
|
isdn_divert_close(struct inode *ino, struct file *filep)
|
|
{
|
|
struct divert_info *inf;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&divert_info_lock, flags);
|
|
if_used--;
|
|
inf = *((struct divert_info **) filep->private_data);
|
|
while (inf) {
|
|
inf->usage_cnt--;
|
|
inf = inf->next;
|
|
}
|
|
if (if_used <= 0)
|
|
while (divert_info_head) {
|
|
inf = divert_info_head;
|
|
divert_info_head = divert_info_head->next;
|
|
kfree(inf);
|
|
}
|
|
spin_unlock_irqrestore(&divert_info_lock, flags);
|
|
return (0);
|
|
} /* isdn_divert_close */
|
|
|
|
/*********/
|
|
/* IOCTL */
|
|
/*********/
|
|
static int isdn_divert_ioctl_unlocked(struct file *file, uint cmd, ulong arg)
|
|
{
|
|
divert_ioctl dioctl;
|
|
int i;
|
|
unsigned long flags;
|
|
divert_rule *rulep;
|
|
char *cp;
|
|
|
|
if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
|
|
return -EFAULT;
|
|
|
|
switch (cmd) {
|
|
case IIOCGETVER:
|
|
dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */
|
|
break;
|
|
|
|
case IIOCGETDRV:
|
|
if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
|
|
return (-EINVAL);
|
|
break;
|
|
|
|
case IIOCGETNAM:
|
|
cp = divert_if.drv_to_name(dioctl.getid.drvid);
|
|
if (!cp)
|
|
return (-EINVAL);
|
|
if (!*cp)
|
|
return (-EINVAL);
|
|
strcpy(dioctl.getid.drvnam, cp);
|
|
break;
|
|
|
|
case IIOCGETRULE:
|
|
if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
|
|
return (-EINVAL);
|
|
dioctl.getsetrule.rule = *rulep; /* copy data */
|
|
break;
|
|
|
|
case IIOCMODRULE:
|
|
if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
|
|
return (-EINVAL);
|
|
spin_lock_irqsave(&divert_lock, flags);
|
|
*rulep = dioctl.getsetrule.rule; /* copy data */
|
|
spin_unlock_irqrestore(&divert_lock, flags);
|
|
return (0); /* no copy required */
|
|
break;
|
|
|
|
case IIOCINSRULE:
|
|
return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
|
|
break;
|
|
|
|
case IIOCDELRULE:
|
|
return (deleterule(dioctl.getsetrule.ruleidx));
|
|
break;
|
|
|
|
case IIOCDODFACT:
|
|
return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
|
|
dioctl.fwd_ctrl.callid,
|
|
dioctl.fwd_ctrl.to_nr));
|
|
|
|
case IIOCDOCFACT:
|
|
case IIOCDOCFDIS:
|
|
case IIOCDOCFINT:
|
|
if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
|
|
return (-EINVAL); /* invalid driver */
|
|
if (strnlen(dioctl.cf_ctrl.msn, sizeof(dioctl.cf_ctrl.msn)) ==
|
|
sizeof(dioctl.cf_ctrl.msn))
|
|
return -EINVAL;
|
|
if (strnlen(dioctl.cf_ctrl.fwd_nr, sizeof(dioctl.cf_ctrl.fwd_nr)) ==
|
|
sizeof(dioctl.cf_ctrl.fwd_nr))
|
|
return -EINVAL;
|
|
if ((i = cf_command(dioctl.cf_ctrl.drvid,
|
|
(cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
|
|
dioctl.cf_ctrl.cfproc,
|
|
dioctl.cf_ctrl.msn,
|
|
dioctl.cf_ctrl.service,
|
|
dioctl.cf_ctrl.fwd_nr,
|
|
&dioctl.cf_ctrl.procid)))
|
|
return (i);
|
|
break;
|
|
|
|
default:
|
|
return (-EINVAL);
|
|
} /* switch cmd */
|
|
return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
|
|
} /* isdn_divert_ioctl */
|
|
|
|
static long isdn_divert_ioctl(struct file *file, uint cmd, ulong arg)
|
|
{
|
|
long ret;
|
|
|
|
mutex_lock(&isdn_divert_mutex);
|
|
ret = isdn_divert_ioctl_unlocked(file, cmd, arg);
|
|
mutex_unlock(&isdn_divert_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations isdn_fops =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.read = isdn_divert_read,
|
|
.write = isdn_divert_write,
|
|
.poll = isdn_divert_poll,
|
|
.unlocked_ioctl = isdn_divert_ioctl,
|
|
.open = isdn_divert_open,
|
|
.release = isdn_divert_close,
|
|
};
|
|
|
|
/****************************/
|
|
/* isdn subdir in /proc/net */
|
|
/****************************/
|
|
static struct proc_dir_entry *isdn_proc_entry = NULL;
|
|
static struct proc_dir_entry *isdn_divert_entry = NULL;
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/***************************************************************************/
|
|
/* divert_dev_init must be called before the proc filesystem may be used */
|
|
/***************************************************************************/
|
|
int
|
|
divert_dev_init(void)
|
|
{
|
|
|
|
init_waitqueue_head(&rd_queue);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
isdn_proc_entry = proc_mkdir("isdn", init_net.proc_net);
|
|
if (!isdn_proc_entry)
|
|
return (-1);
|
|
isdn_divert_entry = proc_create("divert", S_IFREG | S_IRUGO,
|
|
isdn_proc_entry, &isdn_fops);
|
|
if (!isdn_divert_entry) {
|
|
remove_proc_entry("isdn", init_net.proc_net);
|
|
return (-1);
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
return (0);
|
|
} /* divert_dev_init */
|
|
|
|
/***************************************************************************/
|
|
/* divert_dev_deinit must be called before leaving isdn when included as */
|
|
/* a module. */
|
|
/***************************************************************************/
|
|
int
|
|
divert_dev_deinit(void)
|
|
{
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
remove_proc_entry("divert", isdn_proc_entry);
|
|
remove_proc_entry("isdn", init_net.proc_net);
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
return (0);
|
|
} /* divert_dev_deinit */
|