Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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 */