diff options
Diffstat (limited to 'drivers/isdn/divert/divert_procfs.c')
| -rw-r--r-- | drivers/isdn/divert/divert_procfs.c | 336 |
1 files changed, 336 insertions, 0 deletions
diff --git a/drivers/isdn/divert/divert_procfs.c b/drivers/isdn/divert/divert_procfs.c new file mode 100644 index 000000000..342585e04 --- /dev/null +++ b/drivers/isdn/divert/divert_procfs.c @@ -0,0 +1,336 @@ +/* $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 (!(inf = *((struct divert_info **) file->private_data))) { + if (file->f_flags & O_NONBLOCK) + return -EAGAIN; + wait_event_interruptible(rd_queue, (inf = + *((struct divert_info **) file->private_data))); + } + if (!inf) + 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 __poll_t +isdn_divert_poll(struct file *file, poll_table *wait) +{ + __poll_t mask = 0; + + poll_wait(file, &(rd_queue), wait); + /* mask = EPOLLOUT | EPOLLWRNORM; */ + if (*((struct divert_info **) file->private_data)) { + mask |= EPOLLIN | EPOLLRDNORM; + } + 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 */ |