[linux-2.6-block.git] / net / atm / resources.c

/* net/atm/resources.c - Statically allocated resources */

/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */

/* Fixes
 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 * 2002/01 - don't free the whole struct sock on sk->destruct time,
 * 	     use the default destruct function initialized by sock_init_data */

#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/atmdev.h>
#include <linux/sonet.h>
#include <linux/kernel.h> /* for barrier */
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/capability.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/slab.h>

#include <net/sock.h>	 /* for struct sock */

#include "common.h"
#include "resources.h"
#include "addr.h"


LIST_HEAD(atm_devs);
DEFINE_MUTEX(atm_dev_mutex);

static struct atm_dev *__alloc_atm_dev(const char *type)
{
	struct atm_dev *dev;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return NULL;
	dev->type = type;
	dev->signal = ATM_PHY_SIG_UNKNOWN;
	dev->link_rate = ATM_OC3_PCR;
	spin_lock_init(&dev->lock);
	INIT_LIST_HEAD(&dev->local);
	INIT_LIST_HEAD(&dev->lecs);

	return dev;
}

static struct atm_dev *__atm_dev_lookup(int number)
{
	struct atm_dev *dev;
	struct list_head *p;

	list_for_each(p, &atm_devs) {
		dev = list_entry(p, struct atm_dev, dev_list);
		if (dev->number == number) {
			atm_dev_hold(dev);
			return dev;
		}
	}
	return NULL;
}

struct atm_dev *atm_dev_lookup(int number)
{
	struct atm_dev *dev;

	mutex_lock(&atm_dev_mutex);
	dev = __atm_dev_lookup(number);
	mutex_unlock(&atm_dev_mutex);
	return dev;
}
EXPORT_SYMBOL(atm_dev_lookup);

struct atm_dev *atm_dev_register(const char *type, struct device *parent,
				 const struct atmdev_ops *ops, int number,
				 unsigned long *flags)
{
	struct atm_dev *dev, *inuse;

	dev = __alloc_atm_dev(type);
	if (!dev) {
		pr_err("no space for dev %s\n", type);
		return NULL;
	}
	mutex_lock(&atm_dev_mutex);
	if (number != -1) {
		inuse = __atm_dev_lookup(number);
		if (inuse) {
			atm_dev_put(inuse);
			mutex_unlock(&atm_dev_mutex);
			kfree(dev);
			return NULL;
		}
		dev->number = number;
	} else {
		dev->number = 0;
		while ((inuse = __atm_dev_lookup(dev->number))) {
			atm_dev_put(inuse);
			dev->number++;
		}
	}

	dev->ops = ops;
	if (flags)
		dev->flags = *flags;
	else
		memset(&dev->flags, 0, sizeof(dev->flags));
	memset(&dev->stats, 0, sizeof(dev->stats));
	atomic_set(&dev->refcnt, 1);

	if (atm_proc_dev_register(dev) < 0) {
		pr_err("atm_proc_dev_register failed for dev %s\n", type);
		goto out_fail;
	}

	if (atm_register_sysfs(dev, parent) < 0) {
		pr_err("atm_register_sysfs failed for dev %s\n", type);
		atm_proc_dev_deregister(dev);
		goto out_fail;
	}

	list_add_tail(&dev->dev_list, &atm_devs);

out:
	mutex_unlock(&atm_dev_mutex);
	return dev;

out_fail:
	kfree(dev);
	dev = NULL;
	goto out;
}
EXPORT_SYMBOL(atm_dev_register);

void atm_dev_deregister(struct atm_dev *dev)
{
	BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
	set_bit(ATM_DF_REMOVED, &dev->flags);

	/*
	 * if we remove current device from atm_devs list, new device
	 * with same number can appear, such we need deregister proc,
	 * release async all vccs and remove them from vccs list too
	 */
	mutex_lock(&atm_dev_mutex);
	list_del(&dev->dev_list);
	mutex_unlock(&atm_dev_mutex);

	atm_dev_release_vccs(dev);
	atm_unregister_sysfs(dev);
	atm_proc_dev_deregister(dev);

	atm_dev_put(dev);
}
EXPORT_SYMBOL(atm_dev_deregister);

static void copy_aal_stats(struct k_atm_aal_stats *from,
    struct atm_aal_stats *to)
{
#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
	__AAL_STAT_ITEMS
#undef __HANDLE_ITEM
}

static void subtract_aal_stats(struct k_atm_aal_stats *from,
    struct atm_aal_stats *to)
{
#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
	__AAL_STAT_ITEMS
#undef __HANDLE_ITEM
}

static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg,
		       int zero)
{
	struct atm_dev_stats tmp;
	int error = 0;

	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
	if (arg)
		error = copy_to_user(arg, &tmp, sizeof(tmp));
	if (zero && !error) {
		subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
		subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
		subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
	}
	return error ? -EFAULT : 0;
}

int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
{
	void __user *buf;
	int error, len, number, size = 0;
	struct atm_dev *dev;
	struct list_head *p;
	int *tmp_buf, *tmp_p;
	int __user *sioc_len;
	int __user *iobuf_len;

#ifndef CONFIG_COMPAT
	compat = 0; /* Just so the compiler _knows_ */
#endif

	switch (cmd) {
	case ATM_GETNAMES:
		if (compat) {
#ifdef CONFIG_COMPAT
			struct compat_atm_iobuf __user *ciobuf = arg;
			compat_uptr_t cbuf;
			iobuf_len = &ciobuf->length;
			if (get_user(cbuf, &ciobuf->buffer))
				return -EFAULT;
			buf = compat_ptr(cbuf);
#endif
		} else {
			struct atm_iobuf __user *iobuf = arg;
			iobuf_len = &iobuf->length;
			if (get_user(buf, &iobuf->buffer))
				return -EFAULT;
		}
		if (get_user(len, iobuf_len))
			return -EFAULT;
		mutex_lock(&atm_dev_mutex);
		list_for_each(p, &atm_devs)
			size += sizeof(int);
		if (size > len) {
			mutex_unlock(&atm_dev_mutex);
			return -E2BIG;
		}
		tmp_buf = kmalloc(size, GFP_ATOMIC);
		if (!tmp_buf) {
			mutex_unlock(&atm_dev_mutex);
			return -ENOMEM;
		}
		tmp_p = tmp_buf;
		list_for_each(p, &atm_devs) {
			dev = list_entry(p, struct atm_dev, dev_list);
			*tmp_p++ = dev->number;
		}
		mutex_unlock(&atm_dev_mutex);
		error = ((copy_to_user(buf, tmp_buf, size)) ||
			 put_user(size, iobuf_len))
			? -EFAULT : 0;
		kfree(tmp_buf);
		return error;
	default:
		break;
	}

	if (compat) {
#ifdef CONFIG_COMPAT
		struct compat_atmif_sioc __user *csioc = arg;
		compat_uptr_t carg;

		sioc_len = &csioc->length;
		if (get_user(carg, &csioc->arg))
			return -EFAULT;
		buf = compat_ptr(carg);

		if (get_user(len, &csioc->length))
			return -EFAULT;
		if (get_user(number, &csioc->number))
			return -EFAULT;
#endif
	} else {
		struct atmif_sioc __user *sioc = arg;

		sioc_len = &sioc->length;
		if (get_user(buf, &sioc->arg))
			return -EFAULT;
		if (get_user(len, &sioc->length))
			return -EFAULT;
		if (get_user(number, &sioc->number))
			return -EFAULT;
	}

	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
				      number);
	if (!dev)
		return -ENODEV;

	switch (cmd) {
	case ATM_GETTYPE:
		size = strlen(dev->type) + 1;
		if (copy_to_user(buf, dev->type, size)) {
			error = -EFAULT;
			goto done;
		}
		break;
	case ATM_GETESI:
		size = ESI_LEN;
		if (copy_to_user(buf, dev->esi, size)) {
			error = -EFAULT;
			goto done;
		}
		break;
	case ATM_SETESI:
	{
		int i;

		for (i = 0; i < ESI_LEN; i++)
			if (dev->esi[i]) {
				error = -EEXIST;
				goto done;
			}
	}
	/* fall through */
	case ATM_SETESIF:
	{
		unsigned char esi[ESI_LEN];

		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}
		if (copy_from_user(esi, buf, ESI_LEN)) {
			error = -EFAULT;
			goto done;
		}
		memcpy(dev->esi, esi, ESI_LEN);
		error =  ESI_LEN;
		goto done;
	}
	case ATM_GETSTATZ:
		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}
		/* fall through */
	case ATM_GETSTAT:
		size = sizeof(struct atm_dev_stats);
		error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
		if (error)
			goto done;
		break;
	case ATM_GETCIRANGE:
		size = sizeof(struct atm_cirange);
		if (copy_to_user(buf, &dev->ci_range, size)) {
			error = -EFAULT;
			goto done;
		}
		break;
	case ATM_GETLINKRATE:
		size = sizeof(int);
		if (copy_to_user(buf, &dev->link_rate, size)) {
			error = -EFAULT;
			goto done;
		}
		break;
	case ATM_RSTADDR:
		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}
		atm_reset_addr(dev, ATM_ADDR_LOCAL);
		break;
	case ATM_ADDADDR:
	case ATM_DELADDR:
	case ATM_ADDLECSADDR:
	case ATM_DELLECSADDR:
	{
		struct sockaddr_atmsvc addr;

		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}

		if (copy_from_user(&addr, buf, sizeof(addr))) {
			error = -EFAULT;
			goto done;
		}
		if (cmd == ATM_ADDADDR || cmd == ATM_ADDLECSADDR)
			error = atm_add_addr(dev, &addr,
					     (cmd == ATM_ADDADDR ?
					      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
		else
			error = atm_del_addr(dev, &addr,
					     (cmd == ATM_DELADDR ?
					      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
		goto done;
	}
	case ATM_GETADDR:
	case ATM_GETLECSADDR:
		error = atm_get_addr(dev, buf, len,
				     (cmd == ATM_GETADDR ?
				      ATM_ADDR_LOCAL : ATM_ADDR_LECS));
		if (error < 0)
			goto done;
		size = error;
		/* may return 0, but later on size == 0 means "don't
		   write the length" */
		error = put_user(size, sioc_len) ? -EFAULT : 0;
		goto done;
	case ATM_SETLOOP:
		if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
		    __ATM_LM_XTLOC((int) (unsigned long) buf) >
		    __ATM_LM_XTRMT((int) (unsigned long) buf)) {
			error = -EINVAL;
			goto done;
		}
		/* fall through */
	case ATM_SETCIRANGE:
	case SONET_GETSTATZ:
	case SONET_SETDIAG:
	case SONET_CLRDIAG:
	case SONET_SETFRAMING:
		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}
		/* fall through */
	default:
		if (compat) {
#ifdef CONFIG_COMPAT
			if (!dev->ops->compat_ioctl) {
				error = -EINVAL;
				goto done;
			}
			size = dev->ops->compat_ioctl(dev, cmd, buf);
#endif
		} else {
			if (!dev->ops->ioctl) {
				error = -EINVAL;
				goto done;
			}
			size = dev->ops->ioctl(dev, cmd, buf);
		}
		if (size < 0) {
			error = (size == -ENOIOCTLCMD ? -ENOTTY : size);
			goto done;
		}
	}

	if (size)
		error = put_user(size, sioc_len) ? -EFAULT : 0;
	else
		error = 0;
done:
	atm_dev_put(dev);
	return error;
}

void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
{
	mutex_lock(&atm_dev_mutex);
	return seq_list_start_head(&atm_devs, *pos);
}

void atm_dev_seq_stop(struct seq_file *seq, void *v)
{
	mutex_unlock(&atm_dev_mutex);
}

void *atm_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	return seq_list_next(v, &atm_devs, pos);
}
Commit	Line	Data
1da177e4 LT	1	/* net/atm/resources.c - Statically allocated resources */
	2
	3	/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
	4
	5	/* Fixes
	6	* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
	7	* 2002/01 - don't free the whole struct sock on sk->destruct time,
	8	* use the default destruct function initialized by sock_init_data */
	9
99824461	10	#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
1da177e4	11
1da177e4 LT	12	#include <linux/ctype.h>
	13	#include <linux/string.h>
	14	#include <linux/atmdev.h>
	15	#include <linux/sonet.h>
	16	#include <linux/kernel.h> /* for barrier */
	17	#include <linux/module.h>
	18	#include <linux/bitops.h>
4fc268d2	19	#include <linux/capability.h>
1da177e4	20	#include <linux/delay.h>
57b47a53	21	#include <linux/mutex.h>
5a0e3ad6	22	#include <linux/slab.h>
57b47a53	23
1da177e4 LT	24	#include <net/sock.h> /* for struct sock */
	25
	26	#include "common.h"
	27	#include "resources.h"
	28	#include "addr.h"
	29
	30
	31	LIST_HEAD(atm_devs);
57b47a53	32	DEFINE_MUTEX(atm_dev_mutex);
1da177e4 LT	33
	34	static struct atm_dev __alloc_atm_dev(const char type)
	35	{
	36	struct atm_dev *dev;
	37
0da974f4	38	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	39	if (!dev)
1da177e4 LT	40	return NULL;
1da177e4 LT	41	dev->type = type;
	42	dev->signal = ATM_PHY_SIG_UNKNOWN;
	43	dev->link_rate = ATM_OC3_PCR;
	44	spin_lock_init(&dev->lock);
	45	INIT_LIST_HEAD(&dev->local);
0f21ba7c	46	INIT_LIST_HEAD(&dev->lecs);
1da177e4 LT	47
	48	return dev;
	49	}
	50
1da177e4 LT	51	static struct atm_dev *__atm_dev_lookup(int number)
	52	{
	53	struct atm_dev *dev;
	54	struct list_head *p;
	55
	56	list_for_each(p, &atm_devs) {
	57	dev = list_entry(p, struct atm_dev, dev_list);
aaaaaadb	58	if (dev->number == number) {
1da177e4 LT	59	atm_dev_hold(dev);
	60	return dev;
	61	}
	62	}
	63	return NULL;
	64	}
	65
	66	struct atm_dev *atm_dev_lookup(int number)
	67	{
	68	struct atm_dev *dev;
	69
57b47a53	70	mutex_lock(&atm_dev_mutex);
1da177e4	71	dev = __atm_dev_lookup(number);
57b47a53	72	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	73	return dev;
1da177e4 LT	74	}
07b54c9a	75	EXPORT_SYMBOL(atm_dev_lookup);
64bf69dd	76
d9ca676b DW	77	struct atm_dev atm_dev_register(const char type, struct device *parent,
	78	const struct atmdev_ops *ops, int number,
	79	unsigned long *flags)
1da177e4 LT	80	{
	81	struct atm_dev dev, inuse;
	82
	83	dev = __alloc_atm_dev(type);
	84	if (!dev) {
99824461	85	pr_err("no space for dev %s\n", type);
1da177e4 LT	86	return NULL;
1da177e4 LT	87	}
57b47a53	88	mutex_lock(&atm_dev_mutex);
1da177e4	89	if (number != -1) {
07b54c9a JP	90	inuse = __atm_dev_lookup(number);
07b54c9a JP	91	if (inuse) {
1da177e4	92	atm_dev_put(inuse);
57b47a53	93	mutex_unlock(&atm_dev_mutex);
ebc37b61	94	kfree(dev);
1da177e4 LT	95	return NULL;
	96	}
	97	dev->number = number;
	98	} else {
	99	dev->number = 0;
	100	while ((inuse = __atm_dev_lookup(dev->number))) {
	101	atm_dev_put(inuse);
	102	dev->number++;
	103	}
	104	}
	105
	106	dev->ops = ops;
	107	if (flags)
	108	dev->flags = *flags;
	109	else
	110	memset(&dev->flags, 0, sizeof(dev->flags));
	111	memset(&dev->stats, 0, sizeof(dev->stats));
	112	atomic_set(&dev->refcnt, 1);
1da177e4 LT	113
1da177e4 LT	114	if (atm_proc_dev_register(dev) < 0) {
99824461	115	pr_err("atm_proc_dev_register failed for dev %s\n", type);
656d98b0 RK	116	goto out_fail;
	117	}
	118
d9ca676b	119	if (atm_register_sysfs(dev, parent) < 0) {
99824461	120	pr_err("atm_register_sysfs failed for dev %s\n", type);
656d98b0 RK	121	atm_proc_dev_deregister(dev);
656d98b0 RK	122	goto out_fail;
1da177e4	123	}
656d98b0	124
aaaaaadb	125	list_add_tail(&dev->dev_list, &atm_devs);
1da177e4	126
656d98b0 RK	127	out:
656d98b0 RK	128	mutex_unlock(&atm_dev_mutex);
1da177e4	129	return dev;
656d98b0 RK	130
	131	out_fail:
	132	kfree(dev);
	133	dev = NULL;
	134	goto out;
1da177e4	135	}
07b54c9a	136	EXPORT_SYMBOL(atm_dev_register);
1da177e4 LT	137
	138	void atm_dev_deregister(struct atm_dev *dev)
	139	{
64bf69dd SG	140	BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
	141	set_bit(ATM_DF_REMOVED, &dev->flags);
	142
	143	/*
f7d57453 YH	144	* if we remove current device from atm_devs list, new device
f7d57453 YH	145	* with same number can appear, such we need deregister proc,
64bf69dd SG	146	* release async all vccs and remove them from vccs list too
64bf69dd SG	147	*/
57b47a53	148	mutex_lock(&atm_dev_mutex);
1da177e4	149	list_del(&dev->dev_list);
57b47a53	150	mutex_unlock(&atm_dev_mutex);
1da177e4	151
64bf69dd	152	atm_dev_release_vccs(dev);
656d98b0	153	atm_unregister_sysfs(dev);
64bf69dd	154	atm_proc_dev_deregister(dev);
1da177e4	155
64bf69dd	156	atm_dev_put(dev);
1da177e4	157	}
07b54c9a	158	EXPORT_SYMBOL(atm_dev_deregister);
1da177e4 LT	159
	160	static void copy_aal_stats(struct k_atm_aal_stats *from,
	161	struct atm_aal_stats *to)
	162	{
	163	#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
	164	__AAL_STAT_ITEMS
	165	#undef __HANDLE_ITEM
	166	}
	167
1da177e4 LT	168	static void subtract_aal_stats(struct k_atm_aal_stats *from,
	169	struct atm_aal_stats *to)
	170	{
	171	#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
	172	__AAL_STAT_ITEMS
	173	#undef __HANDLE_ITEM
	174	}
	175
07b54c9a JP	176	static int fetch_stats(struct atm_dev dev, struct atm_dev_stats __user arg,
07b54c9a JP	177	int zero)
1da177e4 LT	178	{
	179	struct atm_dev_stats tmp;
	180	int error = 0;
	181
	182	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
	183	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
	184	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
	185	if (arg)
	186	error = copy_to_user(arg, &tmp, sizeof(tmp));
	187	if (zero && !error) {
	188	subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
	189	subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
	190	subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
	191	}
	192	return error ? -EFAULT : 0;
	193	}
	194
8865c418	195	int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
1da177e4 LT	196	{
	197	void __user *buf;
	198	int error, len, number, size = 0;
	199	struct atm_dev *dev;
	200	struct list_head *p;
	201	int tmp_buf, tmp_p;
8865c418 DW	202	int __user *sioc_len;
	203	int __user *iobuf_len;
	204
	205	#ifndef CONFIG_COMPAT
	206	compat = 0; /* Just so the compiler _knows_ */
	207	#endif
	208
1da177e4	209	switch (cmd) {
07b54c9a JP	210	case ATM_GETNAMES:
07b54c9a JP	211	if (compat) {
8865c418	212	#ifdef CONFIG_COMPAT
07b54c9a JP	213	struct compat_atm_iobuf __user *ciobuf = arg;
	214	compat_uptr_t cbuf;
	215	iobuf_len = &ciobuf->length;
	216	if (get_user(cbuf, &ciobuf->buffer))
	217	return -EFAULT;
	218	buf = compat_ptr(cbuf);
8865c418	219	#endif
07b54c9a JP	220	} else {
	221	struct atm_iobuf __user *iobuf = arg;
	222	iobuf_len = &iobuf->length;
	223	if (get_user(buf, &iobuf->buffer))
1da177e4	224	return -EFAULT;
07b54c9a JP	225	}
	226	if (get_user(len, iobuf_len))
	227	return -EFAULT;
	228	mutex_lock(&atm_dev_mutex);
	229	list_for_each(p, &atm_devs)
	230	size += sizeof(int);
	231	if (size > len) {
57b47a53	232	mutex_unlock(&atm_dev_mutex);
07b54c9a JP	233	return -E2BIG;
	234	}
	235	tmp_buf = kmalloc(size, GFP_ATOMIC);
	236	if (!tmp_buf) {
	237	mutex_unlock(&atm_dev_mutex);
	238	return -ENOMEM;
	239	}
	240	tmp_p = tmp_buf;
	241	list_for_each(p, &atm_devs) {
	242	dev = list_entry(p, struct atm_dev, dev_list);
	243	*tmp_p++ = dev->number;
	244	}
	245	mutex_unlock(&atm_dev_mutex);
	246	error = ((copy_to_user(buf, tmp_buf, size)) \|\|
	247	put_user(size, iobuf_len))
	248	? -EFAULT : 0;
	249	kfree(tmp_buf);
	250	return error;
	251	default:
	252	break;
1da177e4 LT	253	}
1da177e4 LT	254
8865c418 DW	255	if (compat) {
	256	#ifdef CONFIG_COMPAT
	257	struct compat_atmif_sioc __user *csioc = arg;
	258	compat_uptr_t carg;
	259
	260	sioc_len = &csioc->length;
	261	if (get_user(carg, &csioc->arg))
	262	return -EFAULT;
	263	buf = compat_ptr(carg);
	264
	265	if (get_user(len, &csioc->length))
	266	return -EFAULT;
	267	if (get_user(number, &csioc->number))
	268	return -EFAULT;
	269	#endif
	270	} else {
	271	struct atmif_sioc __user *sioc = arg;
	272
	273	sioc_len = &sioc->length;
	274	if (get_user(buf, &sioc->arg))
	275	return -EFAULT;
	276	if (get_user(len, &sioc->length))
	277	return -EFAULT;
	278	if (get_user(number, &sioc->number))
	279	return -EFAULT;
	280	}
07b54c9a JP	281
	282	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
	283	number);
	284	if (!dev)
1da177e4	285	return -ENODEV;
f7d57453	286
1da177e4	287	switch (cmd) {
07b54c9a JP	288	case ATM_GETTYPE:
	289	size = strlen(dev->type) + 1;
	290	if (copy_to_user(buf, dev->type, size)) {
	291	error = -EFAULT;
	292	goto done;
	293	}
	294	break;
	295	case ATM_GETESI:
	296	size = ESI_LEN;
	297	if (copy_to_user(buf, dev->esi, size)) {
	298	error = -EFAULT;
	299	goto done;
	300	}
	301	break;
	302	case ATM_SETESI:
	303	{
	304	int i;
	305
	306	for (i = 0; i < ESI_LEN; i++)
	307	if (dev->esi[i]) {
	308	error = -EEXIST;
1da177e4 LT	309	goto done;
1da177e4 LT	310	}
07b54c9a JP	311	}
	312	/* fall through */
	313	case ATM_SETESIF:
	314	{
	315	unsigned char esi[ESI_LEN];
	316
	317	if (!capable(CAP_NET_ADMIN)) {
	318	error = -EPERM;
	319	goto done;
	320	}
	321	if (copy_from_user(esi, buf, ESI_LEN)) {
	322	error = -EFAULT;
	323	goto done;
	324	}
	325	memcpy(dev->esi, esi, ESI_LEN);
	326	error = ESI_LEN;
	327	goto done;
	328	}
	329	case ATM_GETSTATZ:
	330	if (!capable(CAP_NET_ADMIN)) {
	331	error = -EPERM;
	332	goto done;
	333	}
	334	/* fall through */
	335	case ATM_GETSTAT:
	336	size = sizeof(struct atm_dev_stats);
	337	error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
	338	if (error)
	339	goto done;
	340	break;
	341	case ATM_GETCIRANGE:
	342	size = sizeof(struct atm_cirange);
	343	if (copy_to_user(buf, &dev->ci_range, size)) {
	344	error = -EFAULT;
	345	goto done;
	346	}
	347	break;
	348	case ATM_GETLINKRATE:
	349	size = sizeof(int);
	350	if (copy_to_user(buf, &dev->link_rate, size)) {
	351	error = -EFAULT;
	352	goto done;
	353	}
	354	break;
	355	case ATM_RSTADDR:
	356	if (!capable(CAP_NET_ADMIN)) {
	357	error = -EPERM;
	358	goto done;
	359	}
	360	atm_reset_addr(dev, ATM_ADDR_LOCAL);
	361	break;
	362	case ATM_ADDADDR:
	363	case ATM_DELADDR:
	364	case ATM_ADDLECSADDR:
	365	case ATM_DELLECSADDR:
	366	{
	367	struct sockaddr_atmsvc addr;
	368
	369	if (!capable(CAP_NET_ADMIN)) {
	370	error = -EPERM;
	371	goto done;
	372	}
	373
	374	if (copy_from_user(&addr, buf, sizeof(addr))) {
375	error = -EFAULT;
376	goto done;
377	}
378	if (cmd == ATM_ADDADDR \|\| cmd == ATM_ADDLECSADDR)
379	error = atm_add_addr(dev, &addr,
380	(cmd == ATM_ADDADDR ?
0f21ba7c	381	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
07b54c9a JP	382	else
	383	error = atm_del_addr(dev, &addr,
	384	(cmd == ATM_DELADDR ?
	385	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	386	goto done;
	387	}
	388	case ATM_GETADDR:
	389	case ATM_GETLECSADDR:
	390	error = atm_get_addr(dev, buf, len,
	391	(cmd == ATM_GETADDR ?
	392	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	393	if (error < 0)
	394	goto done;
	395	size = error;
	396	/* may return 0, but later on size == 0 means "don't
	397	write the length" */
	398	error = put_user(size, sioc_len) ? -EFAULT : 0;
	399	goto done;
	400	case ATM_SETLOOP:
	401	if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
	402	__ATM_LM_XTLOC((int) (unsigned long) buf) >
	403	__ATM_LM_XTRMT((int) (unsigned long) buf)) {
	404	error = -EINVAL;
1da177e4	405	goto done;
07b54c9a JP	406	}
	407	/* fall through */
	408	case ATM_SETCIRANGE:
	409	case SONET_GETSTATZ:
	410	case SONET_SETDIAG:
	411	case SONET_CLRDIAG:
	412	case SONET_SETFRAMING:
	413	if (!capable(CAP_NET_ADMIN)) {
	414	error = -EPERM;
	415	goto done;
	416	}
	417	/* fall through */
	418	default:
	419	if (compat) {
	420	#ifdef CONFIG_COMPAT
	421	if (!dev->ops->compat_ioctl) {
1da177e4 LT	422	error = -EINVAL;
	423	goto done;
	424	}
07b54c9a	425	size = dev->ops->compat_ioctl(dev, cmd, buf);
8865c418	426	#endif
07b54c9a JP	427	} else {
	428	if (!dev->ops->ioctl) {
	429	error = -EINVAL;
1da177e4 LT	430	goto done;
1da177e4 LT	431	}
07b54c9a JP	432	size = dev->ops->ioctl(dev, cmd, buf);
	433	}
	434	if (size < 0) {
4a2c2406	435	error = (size == -ENOIOCTLCMD ? -ENOTTY : size);
07b54c9a JP	436	goto done;
07b54c9a JP	437	}
1da177e4	438	}
f7d57453	439
1da177e4	440	if (size)
07b54c9a	441	error = put_user(size, sioc_len) ? -EFAULT : 0;
1da177e4 LT	442	else
	443	error = 0;
	444	done:
	445	atm_dev_put(dev);
	446	return error;
	447	}
	448
1da177e4 LT	449	void atm_dev_seq_start(struct seq_file seq, loff_t *pos)
1da177e4 LT	450	{
f7d57453	451	mutex_lock(&atm_dev_mutex);
67de7924	452	return seq_list_start_head(&atm_devs, *pos);
1da177e4 LT	453	}
	454
	455	void atm_dev_seq_stop(struct seq_file seq, void v)
	456	{
f7d57453	457	mutex_unlock(&atm_dev_mutex);
1da177e4	458	}
f7d57453	459
1da177e4 LT	460	void atm_dev_seq_next(struct seq_file seq, void v, loff_t pos)
1da177e4 LT	461	{
67de7924	462	return seq_list_next(v, &atm_devs, pos);
1da177e4	463	}