[net-next-2.6.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>
#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/smp_lock.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 */

#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 ((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;

	lock_kernel();
	ret = isdn_divert_ioctl_unlocked(file, cmd, arg);
	unlock_kernel();

	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 */
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	13	#include <linux/poll.h>
1da177e4 LT	14	#ifdef CONFIG_PROC_FS
	15	#include <linux/proc_fs.h>
	16	#else
	17	#include <linux/fs.h>
	18	#endif
a99bbaf5	19	#include <linux/sched.h>
1da177e4	20	#include <linux/isdnif.h>
457c4cbc	21	#include <net/net_namespace.h>
d79b6f4d	22	#include <linux/smp_lock.h>
1da177e4 LT	23	#include "isdn_divert.h"
	24
	25
	26	/*********************************/
	27	/* Variables for interface queue */
	28	/*********************************/
	29	ulong if_used = 0; /* number of interface users */
	30	static struct divert_info divert_info_head = NULL; / head of queue */
	31	static struct divert_info divert_info_tail = NULL; / pointer to last entry */
	32	static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
	33	static wait_queue_head_t rd_queue;
	34
	35	/*********************************/
	36	/* put an info buffer into queue */
	37	/*********************************/
	38	void
	39	put_info_buffer(char *cp)
	40	{
	41	struct divert_info *ib;
	42	unsigned long flags;
	43
	44	if (if_used <= 0)
	45	return;
	46	if (!cp)
	47	return;
	48	if (!*cp)
	49	return;
5cbded58	50	if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
1da177e4 LT	51	return; /* no memory */
	52	strcpy(ib->info_start, cp); /* set output string */
	53	ib->next = NULL;
	54	spin_lock_irqsave( &divert_info_lock, flags );
	55	ib->usage_cnt = if_used;
	56	if (!divert_info_head)
	57	divert_info_head = ib; /* new head */
	58	else
	59	divert_info_tail->next = ib; /* follows existing messages */
	60	divert_info_tail = ib; /* new tail */
	61
	62	/* delete old entrys */
	63	while (divert_info_head->next) {
	64	if ((divert_info_head->usage_cnt <= 0) &&
	65	(divert_info_head->next->usage_cnt <= 0)) {
	66	ib = divert_info_head;
	67	divert_info_head = divert_info_head->next;
	68	kfree(ib);
	69	} else
	70	break;
	71	} /* divert_info_head->next */
	72	spin_unlock_irqrestore( &divert_info_lock, flags );
	73	wake_up_interruptible(&(rd_queue));
	74	} /* put_info_buffer */
	75
732781da CS	76	#ifdef CONFIG_PROC_FS
732781da CS	77
1da177e4 LT	78	/**********************************/
	79	/* deflection device read routine */
	80	/**********************************/
	81	static ssize_t
	82	isdn_divert_read(struct file file, char __user buf, size_t count, loff_t * off)
	83	{
	84	struct divert_info *inf;
	85	int len;
	86
	87	if (!((struct divert_info *) file->private_data)) {
	88	if (file->f_flags & O_NONBLOCK)
	89	return -EAGAIN;
	90	interruptible_sleep_on(&(rd_queue));
	91	}
	92	if (!(inf = ((struct divert_info *) file->private_data)))
	93	return (0);
	94
	95	inf->usage_cnt--; /* new usage count */
	96	file->private_data = &inf->next; /* next structure */
	97	if ((len = strlen(inf->info_start)) <= count) {
	98	if (copy_to_user(buf, inf->info_start, len))
	99	return -EFAULT;
	100	*off += len;
	101	return (len);
	102	}
	103	return (0);
	104	} /* isdn_divert_read */
	105
	106	/**********************************/
	107	/* deflection device write routine */
	108	/**********************************/
	109	static ssize_t
	110	isdn_divert_write(struct file file, const char __user buf, size_t count, loff_t * off)
	111	{
	112	return (-ENODEV);
	113	} /* isdn_divert_write */
	114
	115
	116	/***************************************/
	117	/* select routines for various kernels */
	118	/***************************************/
	119	static unsigned int
	120	isdn_divert_poll(struct file file, poll_table wait)
	121	{
	122	unsigned int mask = 0;
	123
	124	poll_wait(file, &(rd_queue), wait);
	125	/* mask = POLLOUT \| POLLWRNORM; */
	126	if (((struct divert_info *) file->private_data)) {
	127	mask \|= POLLIN \| POLLRDNORM;
	128	}
	129	return mask;
	130	} /* isdn_divert_poll */
	131
	132	/****************/
	133	/* Open routine */
	134	/****************/
	135	static int
	136	isdn_divert_open(struct inode ino, struct file filep)
	137	{
	138	unsigned long flags;
	139
	140	spin_lock_irqsave( &divert_info_lock, flags );
	141	if_used++;
142	if (divert_info_head)
143	filep->private_data = &(divert_info_tail->next);
144	else
145	filep->private_data = &divert_info_head;
146	spin_unlock_irqrestore( &divert_info_lock, flags );
147	/* start_divert(); */
148	return nonseekable_open(ino, filep);
149	} /* isdn_divert_open */
150
151	/*******************/
152	/* close routine */
153	/*******************/
154	static int
155	isdn_divert_close(struct inode ino, struct file filep)
156	{
157	struct divert_info *inf;
158	unsigned long flags;
159
160	spin_lock_irqsave( &divert_info_lock, flags );
161	if_used--;
162	inf = ((struct divert_info *) filep->private_data);
163	while (inf) {
164	inf->usage_cnt--;
165	inf = inf->next;
166	}
167	if (if_used <= 0)
168	while (divert_info_head) {
169	inf = divert_info_head;
170	divert_info_head = divert_info_head->next;
171	kfree(inf);
172	}
173	spin_unlock_irqrestore( &divert_info_lock, flags );
174	return (0);
175	} /* isdn_divert_close */
176
177	/*********/
178	/* IOCTL */
179	/*********/
d79b6f4d	180	static int isdn_divert_ioctl_unlocked(struct file *file, uint cmd, ulong arg)
1da177e4 LT	181	{
	182	divert_ioctl dioctl;
	183	int i;
	184	unsigned long flags;
	185	divert_rule *rulep;
	186	char *cp;
	187
	188	if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
	189	return -EFAULT;
	190
	191	switch (cmd) {
	192	case IIOCGETVER:
	193	dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */
	194	break;
	195
	196	case IIOCGETDRV:
	197	if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
	198	return (-EINVAL);
	199	break;
	200
	201	case IIOCGETNAM:
	202	cp = divert_if.drv_to_name(dioctl.getid.drvid);
	203	if (!cp)
	204	return (-EINVAL);
	205	if (!*cp)
	206	return (-EINVAL);
	207	strcpy(dioctl.getid.drvnam, cp);
	208	break;
	209
	210	case IIOCGETRULE:
	211	if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
	212	return (-EINVAL);
	213	dioctl.getsetrule.rule = rulep; / copy data */
	214	break;
	215
	216	case IIOCMODRULE:
	217	if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
	218	return (-EINVAL);
	219	spin_lock_irqsave(&divert_lock, flags);
	220	rulep = dioctl.getsetrule.rule; / copy data */
	221	spin_unlock_irqrestore(&divert_lock, flags);
	222	return (0); /* no copy required */
	223	break;
	224
	225	case IIOCINSRULE:
	226	return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
	227	break;
	228
	229	case IIOCDELRULE:
	230	return (deleterule(dioctl.getsetrule.ruleidx));
	231	break;
	232
	233	case IIOCDODFACT:
	234	return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
	235	dioctl.fwd_ctrl.callid,
	236	dioctl.fwd_ctrl.to_nr));
	237
	238	case IIOCDOCFACT:
	239	case IIOCDOCFDIS:
	240	case IIOCDOCFINT:
	241	if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
	242	return (-EINVAL); /* invalid driver */
	243	if ((i = cf_command(dioctl.cf_ctrl.drvid,
	244	(cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
245	dioctl.cf_ctrl.cfproc,
246	dioctl.cf_ctrl.msn,
247	dioctl.cf_ctrl.service,
248	dioctl.cf_ctrl.fwd_nr,
249	&dioctl.cf_ctrl.procid)))
250	return (i);
251	break;
252
253	default:
254	return (-EINVAL);
255	} /* switch cmd */
256	return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
257	} /* isdn_divert_ioctl */
258
d79b6f4d FW	259	static long isdn_divert_ioctl(struct file *file, uint cmd, ulong arg)
	260	{
	261	long ret;
	262
	263	lock_kernel();
	264	ret = isdn_divert_ioctl_unlocked(file, cmd, arg);
	265	unlock_kernel();
	266
	267	return ret;
	268	}
	269
2b8693c0	270	static const struct file_operations isdn_fops =
1da177e4 LT	271	{
	272	.owner = THIS_MODULE,
	273	.llseek = no_llseek,
	274	.read = isdn_divert_read,
	275	.write = isdn_divert_write,
	276	.poll = isdn_divert_poll,
d79b6f4d	277	.unlocked_ioctl = isdn_divert_ioctl,
1da177e4 LT	278	.open = isdn_divert_open,
	279	.release = isdn_divert_close,
	280	};
	281
	282	/****************************/
	283	/* isdn subdir in /proc/net */
	284	/****************************/
	285	static struct proc_dir_entry *isdn_proc_entry = NULL;
	286	static struct proc_dir_entry *isdn_divert_entry = NULL;
	287	#endif /* CONFIG_PROC_FS */
	288
	289	/***************************************************************************/
	290	/* divert_dev_init must be called before the proc filesystem may be used */
	291	/***************************************************************************/
	292	int
	293	divert_dev_init(void)
	294	{
	295
	296	init_waitqueue_head(&rd_queue);
	297
	298	#ifdef CONFIG_PROC_FS
457c4cbc	299	isdn_proc_entry = proc_mkdir("isdn", init_net.proc_net);
1da177e4 LT	300	if (!isdn_proc_entry)
1da177e4 LT	301	return (-1);
ac41cfd1 DL	302	isdn_divert_entry = proc_create("divert", S_IFREG \| S_IRUGO,
ac41cfd1 DL	303	isdn_proc_entry, &isdn_fops);
1da177e4	304	if (!isdn_divert_entry) {
457c4cbc	305	remove_proc_entry("isdn", init_net.proc_net);
1da177e4 LT	306	return (-1);
1da177e4 LT	307	}
1da177e4 LT	308	#endif /* CONFIG_PROC_FS */
	309
	310	return (0);
	311	} /* divert_dev_init */
	312
	313	/***************************************************************************/
	314	/* divert_dev_deinit must be called before leaving isdn when included as */
	315	/* a module. */
	316	/***************************************************************************/
	317	int
	318	divert_dev_deinit(void)
	319	{
	320
	321	#ifdef CONFIG_PROC_FS
	322	remove_proc_entry("divert", isdn_proc_entry);
457c4cbc	323	remove_proc_entry("isdn", init_net.proc_net);
1da177e4 LT	324	#endif /* CONFIG_PROC_FS */
	325
	326	return (0);
	327	} /* divert_dev_deinit */