[deliverable/linux.git] / drivers / isdn / divert / divert_procfs.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/smp_lock.h>
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
#else
#include <linux/fs.h>
#endif
#include <linux/isdnif.h>
#include "isdn_divert.h"


/*********************************/
/* Variables for interface queue */
/*********************************/
ulong if_used = 0;		/* number of interface users */
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 */

/**********************************/
/* 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(struct inode *inode, 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 ((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 */


#ifdef CONFIG_PROC_FS
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,
	.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("net/isdn", NULL);
	if (!isdn_proc_entry)
		return (-1);
	isdn_divert_entry = create_proc_entry("divert", S_IFREG | S_IRUGO, isdn_proc_entry);
	if (!isdn_divert_entry) {
		remove_proc_entry("net/isdn", NULL);
		return (-1);
	}
	isdn_divert_entry->proc_fops = &isdn_fops; 
	isdn_divert_entry->owner = THIS_MODULE; 
#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("net/isdn", NULL);
#endif	/* CONFIG_PROC_FS */

	return (0);
}				/* divert_dev_deinit */
Commit	Line	Data
1da177e4 LT	1	/* $Id: divert_procfs.c,v 1.11.6.2 2001/09/23 22:24:36 kai Exp $
	2	*
	3	* Filesystem handling for the diversion supplementary services.
	4	*
	5	* Copyright 1998 by Werner Cornelius (werner@isdn4linux.de)
	6	*
	7	* This software may be used and distributed according to the terms
	8	* of the GNU General Public License, incorporated herein by reference.
	9	*
	10	*/
	11
1da177e4	12	#include <linux/module.h>
1da177e4 LT	13	#include <linux/poll.h>
	14	#include <linux/smp_lock.h>
	15	#ifdef CONFIG_PROC_FS
	16	#include <linux/proc_fs.h>
	17	#else
	18	#include <linux/fs.h>
	19	#endif
	20	#include <linux/isdnif.h>
	21	#include "isdn_divert.h"
	22
	23
	24	/*********************************/
	25	/* Variables for interface queue */
	26	/*********************************/
	27	ulong if_used = 0; /* number of interface users */
	28	static struct divert_info divert_info_head = NULL; / head of queue */
	29	static struct divert_info divert_info_tail = NULL; / pointer to last entry */
	30	static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
	31	static wait_queue_head_t rd_queue;
	32
	33	/*********************************/
	34	/* put an info buffer into queue */
	35	/*********************************/
	36	void
	37	put_info_buffer(char *cp)
	38	{
	39	struct divert_info *ib;
	40	unsigned long flags;
	41
	42	if (if_used <= 0)
	43	return;
	44	if (!cp)
	45	return;
	46	if (!*cp)
	47	return;
5cbded58	48	if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
1da177e4 LT	49	return; /* no memory */
	50	strcpy(ib->info_start, cp); /* set output string */
	51	ib->next = NULL;
	52	spin_lock_irqsave( &divert_info_lock, flags );
	53	ib->usage_cnt = if_used;
	54	if (!divert_info_head)
	55	divert_info_head = ib; /* new head */
	56	else
	57	divert_info_tail->next = ib; /* follows existing messages */
	58	divert_info_tail = ib; /* new tail */
	59
	60	/* delete old entrys */
	61	while (divert_info_head->next) {
	62	if ((divert_info_head->usage_cnt <= 0) &&
	63	(divert_info_head->next->usage_cnt <= 0)) {
	64	ib = divert_info_head;
	65	divert_info_head = divert_info_head->next;
	66	kfree(ib);
	67	} else
	68	break;
	69	} /* divert_info_head->next */
	70	spin_unlock_irqrestore( &divert_info_lock, flags );
	71	wake_up_interruptible(&(rd_queue));
	72	} /* put_info_buffer */
	73
	74	/**********************************/
	75	/* deflection device read routine */
	76	/**********************************/
	77	static ssize_t
	78	isdn_divert_read(struct file file, char __user buf, size_t count, loff_t * off)
	79	{
	80	struct divert_info *inf;
	81	int len;
	82
	83	if (!((struct divert_info *) file->private_data)) {
	84	if (file->f_flags & O_NONBLOCK)
	85	return -EAGAIN;
	86	interruptible_sleep_on(&(rd_queue));
	87	}
	88	if (!(inf = ((struct divert_info *) file->private_data)))
	89	return (0);
	90
	91	inf->usage_cnt--; /* new usage count */
	92	file->private_data = &inf->next; /* next structure */
	93	if ((len = strlen(inf->info_start)) <= count) {
	94	if (copy_to_user(buf, inf->info_start, len))
	95	return -EFAULT;
	96	*off += len;
	97	return (len);
	98	}
	99	return (0);
	100	} /* isdn_divert_read */
	101
	102	/**********************************/
	103	/* deflection device write routine */
	104	/**********************************/
	105	static ssize_t
	106	isdn_divert_write(struct file file, const char __user buf, size_t count, loff_t * off)
	107	{
	108	return (-ENODEV);
	109	} /* isdn_divert_write */
	110
	111
	112	/***************************************/
113	/* select routines for various kernels */
114	/***************************************/
115	static unsigned int
116	isdn_divert_poll(struct file file, poll_table wait)
117	{
118	unsigned int mask = 0;
119
120	poll_wait(file, &(rd_queue), wait);
121	/* mask = POLLOUT \| POLLWRNORM; */
122	if (((struct divert_info *) file->private_data)) {
123	mask \|= POLLIN \| POLLRDNORM;
124	}
125	return mask;
126	} /* isdn_divert_poll */
127
128	/****************/
129	/* Open routine */
130	/****************/
131	static int
132	isdn_divert_open(struct inode ino, struct file filep)
133	{
134	unsigned long flags;
135
136	spin_lock_irqsave( &divert_info_lock, flags );
137	if_used++;
138	if (divert_info_head)
139	filep->private_data = &(divert_info_tail->next);
140	else
141	filep->private_data = &divert_info_head;
142	spin_unlock_irqrestore( &divert_info_lock, flags );
143	/* start_divert(); */
144	return nonseekable_open(ino, filep);
145	} /* isdn_divert_open */
146
147	/*******************/
148	/* close routine */
149	/*******************/
150	static int
151	isdn_divert_close(struct inode ino, struct file filep)
152	{
153	struct divert_info *inf;
154	unsigned long flags;
155
156	spin_lock_irqsave( &divert_info_lock, flags );
157	if_used--;
158	inf = ((struct divert_info *) filep->private_data);
159	while (inf) {
160	inf->usage_cnt--;
161	inf = inf->next;
162	}
163	if (if_used <= 0)
164	while (divert_info_head) {
165	inf = divert_info_head;
166	divert_info_head = divert_info_head->next;
167	kfree(inf);
168	}
169	spin_unlock_irqrestore( &divert_info_lock, flags );
170	return (0);
171	} /* isdn_divert_close */
172
173	/*********/
174	/* IOCTL */
175	/*********/
176	static int
177	isdn_divert_ioctl(struct inode inode, struct file file,
178	uint cmd, ulong arg)
179	{
180	divert_ioctl dioctl;
181	int i;
182	unsigned long flags;
183	divert_rule *rulep;
184	char *cp;
185
186	if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
187	return -EFAULT;
188
189	switch (cmd) {
190	case IIOCGETVER:
191	dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */
192	break;
193
194	case IIOCGETDRV:
195	if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
196	return (-EINVAL);
197	break;
198
199	case IIOCGETNAM:
200	cp = divert_if.drv_to_name(dioctl.getid.drvid);
201	if (!cp)
202	return (-EINVAL);
203	if (!*cp)
204	return (-EINVAL);
205	strcpy(dioctl.getid.drvnam, cp);
206	break;
207
208	case IIOCGETRULE:
209	if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
210	return (-EINVAL);
211	dioctl.getsetrule.rule = rulep; / copy data */
212	break;
213
214	case IIOCMODRULE:
215	if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
216	return (-EINVAL);
217	spin_lock_irqsave(&divert_lock, flags);
218	rulep = dioctl.getsetrule.rule; / copy data */
219	spin_unlock_irqrestore(&divert_lock, flags);
220	return (0); /* no copy required */
221	break;
222
223	case IIOCINSRULE:
224	return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
225	break;
226
227	case IIOCDELRULE:
228	return (deleterule(dioctl.getsetrule.ruleidx));
229	break;
230
231	case IIOCDODFACT:
232	return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
233	dioctl.fwd_ctrl.callid,
234	dioctl.fwd_ctrl.to_nr));
235
236	case IIOCDOCFACT:
237	case IIOCDOCFDIS:
238	case IIOCDOCFINT:
239	if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
240	return (-EINVAL); /* invalid driver */
241	if ((i = cf_command(dioctl.cf_ctrl.drvid,
242	(cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
243	dioctl.cf_ctrl.cfproc,
244	dioctl.cf_ctrl.msn,
245	dioctl.cf_ctrl.service,
246	dioctl.cf_ctrl.fwd_nr,
247	&dioctl.cf_ctrl.procid)))
248	return (i);
249	break;
250
251	default:
252	return (-EINVAL);
253	} /* switch cmd */
254	return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
255	} /* isdn_divert_ioctl */
256
257
258	#ifdef CONFIG_PROC_FS
2b8693c0	259	static const struct file_operations isdn_fops =
1da177e4 LT	260	{
	261	.owner = THIS_MODULE,
	262	.llseek = no_llseek,
	263	.read = isdn_divert_read,
	264	.write = isdn_divert_write,
	265	.poll = isdn_divert_poll,
	266	.ioctl = isdn_divert_ioctl,
	267	.open = isdn_divert_open,
	268	.release = isdn_divert_close,
	269	};
	270
	271	/****************************/
	272	/* isdn subdir in /proc/net */
	273	/****************************/
	274	static struct proc_dir_entry *isdn_proc_entry = NULL;
	275	static struct proc_dir_entry *isdn_divert_entry = NULL;
	276	#endif /* CONFIG_PROC_FS */
	277
	278	/***************************************************************************/
	279	/* divert_dev_init must be called before the proc filesystem may be used */
	280	/***************************************************************************/
	281	int
	282	divert_dev_init(void)
	283	{
	284
	285	init_waitqueue_head(&rd_queue);
	286
	287	#ifdef CONFIG_PROC_FS
66600221	288	isdn_proc_entry = proc_mkdir("net/isdn", NULL);
1da177e4 LT	289	if (!isdn_proc_entry)
	290	return (-1);
	291	isdn_divert_entry = create_proc_entry("divert", S_IFREG \| S_IRUGO, isdn_proc_entry);
	292	if (!isdn_divert_entry) {
66600221	293	remove_proc_entry("net/isdn", NULL);
1da177e4 LT	294	return (-1);
	295	}
	296	isdn_divert_entry->proc_fops = &isdn_fops;
	297	isdn_divert_entry->owner = THIS_MODULE;
	298	#endif /* CONFIG_PROC_FS */
	299
	300	return (0);
	301	} /* divert_dev_init */
	302
	303	/***************************************************************************/
	304	/* divert_dev_deinit must be called before leaving isdn when included as */
	305	/* a module. */
	306	/***************************************************************************/
	307	int
	308	divert_dev_deinit(void)
	309	{
	310
	311	#ifdef CONFIG_PROC_FS
	312	remove_proc_entry("divert", isdn_proc_entry);
66600221	313	remove_proc_entry("net/isdn", NULL);
1da177e4 LT	314	#endif /* CONFIG_PROC_FS */
	315
	316	return (0);
	317	} /* divert_dev_deinit */