[net-next-2.6.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, 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) < 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 ? -EINVAL : 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
1da177e4 LT	77	struct atm_dev atm_dev_register(const char type, const struct atmdev_ops *ops,
	78	int number, unsigned long *flags)
	79	{
	80	struct atm_dev dev, inuse;
	81
	82	dev = __alloc_atm_dev(type);
	83	if (!dev) {
99824461	84	pr_err("no space for dev %s\n", type);
1da177e4 LT	85	return NULL;
1da177e4 LT	86	}
57b47a53	87	mutex_lock(&atm_dev_mutex);
1da177e4	88	if (number != -1) {
07b54c9a JP	89	inuse = __atm_dev_lookup(number);
07b54c9a JP	90	if (inuse) {
1da177e4	91	atm_dev_put(inuse);
57b47a53	92	mutex_unlock(&atm_dev_mutex);
ebc37b61	93	kfree(dev);
1da177e4 LT	94	return NULL;
	95	}
	96	dev->number = number;
	97	} else {
	98	dev->number = 0;
	99	while ((inuse = __atm_dev_lookup(dev->number))) {
	100	atm_dev_put(inuse);
	101	dev->number++;
	102	}
	103	}
	104
	105	dev->ops = ops;
	106	if (flags)
	107	dev->flags = *flags;
	108	else
	109	memset(&dev->flags, 0, sizeof(dev->flags));
	110	memset(&dev->stats, 0, sizeof(dev->stats));
	111	atomic_set(&dev->refcnt, 1);
1da177e4 LT	112
1da177e4 LT	113	if (atm_proc_dev_register(dev) < 0) {
99824461	114	pr_err("atm_proc_dev_register failed for dev %s\n", type);
656d98b0 RK	115	goto out_fail;
	116	}
	117
	118	if (atm_register_sysfs(dev) < 0) {
99824461	119	pr_err("atm_register_sysfs failed for dev %s\n", type);
656d98b0 RK	120	atm_proc_dev_deregister(dev);
656d98b0 RK	121	goto out_fail;
1da177e4	122	}
656d98b0	123
aaaaaadb	124	list_add_tail(&dev->dev_list, &atm_devs);
1da177e4	125
656d98b0 RK	126	out:
656d98b0 RK	127	mutex_unlock(&atm_dev_mutex);
1da177e4	128	return dev;
656d98b0 RK	129
	130	out_fail:
	131	kfree(dev);
	132	dev = NULL;
	133	goto out;
1da177e4	134	}
07b54c9a	135	EXPORT_SYMBOL(atm_dev_register);
1da177e4 LT	136
	137	void atm_dev_deregister(struct atm_dev *dev)
	138	{
64bf69dd SG	139	BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
	140	set_bit(ATM_DF_REMOVED, &dev->flags);
	141
	142	/*
f7d57453 YH	143	* if we remove current device from atm_devs list, new device
f7d57453 YH	144	* with same number can appear, such we need deregister proc,
64bf69dd SG	145	* release async all vccs and remove them from vccs list too
64bf69dd SG	146	*/
57b47a53	147	mutex_lock(&atm_dev_mutex);
1da177e4	148	list_del(&dev->dev_list);
57b47a53	149	mutex_unlock(&atm_dev_mutex);
1da177e4	150
64bf69dd	151	atm_dev_release_vccs(dev);
656d98b0	152	atm_unregister_sysfs(dev);
64bf69dd	153	atm_proc_dev_deregister(dev);
1da177e4	154
64bf69dd	155	atm_dev_put(dev);
1da177e4	156	}
07b54c9a	157	EXPORT_SYMBOL(atm_dev_deregister);
1da177e4 LT	158
	159	static void copy_aal_stats(struct k_atm_aal_stats *from,
	160	struct atm_aal_stats *to)
	161	{
	162	#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
	163	__AAL_STAT_ITEMS
	164	#undef __HANDLE_ITEM
	165	}
	166
1da177e4 LT	167	static void subtract_aal_stats(struct k_atm_aal_stats *from,
	168	struct atm_aal_stats *to)
	169	{
	170	#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
	171	__AAL_STAT_ITEMS
	172	#undef __HANDLE_ITEM
	173	}
	174
07b54c9a JP	175	static int fetch_stats(struct atm_dev dev, struct atm_dev_stats __user arg,
07b54c9a JP	176	int zero)
1da177e4 LT	177	{
	178	struct atm_dev_stats tmp;
	179	int error = 0;
	180
	181	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
	182	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
	183	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
	184	if (arg)
	185	error = copy_to_user(arg, &tmp, sizeof(tmp));
	186	if (zero && !error) {
	187	subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
	188	subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
	189	subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
	190	}
	191	return error ? -EFAULT : 0;
	192	}
	193
8865c418	194	int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
1da177e4 LT	195	{
	196	void __user *buf;
	197	int error, len, number, size = 0;
	198	struct atm_dev *dev;
	199	struct list_head *p;
	200	int tmp_buf, tmp_p;
8865c418 DW	201	int __user *sioc_len;
	202	int __user *iobuf_len;
	203
	204	#ifndef CONFIG_COMPAT
	205	compat = 0; /* Just so the compiler _knows_ */
	206	#endif
	207
1da177e4	208	switch (cmd) {
07b54c9a JP	209	case ATM_GETNAMES:
07b54c9a JP	210	if (compat) {
8865c418	211	#ifdef CONFIG_COMPAT
07b54c9a JP	212	struct compat_atm_iobuf __user *ciobuf = arg;
	213	compat_uptr_t cbuf;
	214	iobuf_len = &ciobuf->length;
	215	if (get_user(cbuf, &ciobuf->buffer))
	216	return -EFAULT;
	217	buf = compat_ptr(cbuf);
8865c418	218	#endif
07b54c9a JP	219	} else {
	220	struct atm_iobuf __user *iobuf = arg;
	221	iobuf_len = &iobuf->length;
	222	if (get_user(buf, &iobuf->buffer))
1da177e4	223	return -EFAULT;
07b54c9a JP	224	}
	225	if (get_user(len, iobuf_len))
	226	return -EFAULT;
	227	mutex_lock(&atm_dev_mutex);
	228	list_for_each(p, &atm_devs)
	229	size += sizeof(int);
	230	if (size > len) {
57b47a53	231	mutex_unlock(&atm_dev_mutex);
07b54c9a JP	232	return -E2BIG;
	233	}
	234	tmp_buf = kmalloc(size, GFP_ATOMIC);
	235	if (!tmp_buf) {
	236	mutex_unlock(&atm_dev_mutex);
	237	return -ENOMEM;
	238	}
	239	tmp_p = tmp_buf;
	240	list_for_each(p, &atm_devs) {
	241	dev = list_entry(p, struct atm_dev, dev_list);
	242	*tmp_p++ = dev->number;
	243	}
	244	mutex_unlock(&atm_dev_mutex);
	245	error = ((copy_to_user(buf, tmp_buf, size)) \|\|
	246	put_user(size, iobuf_len))
	247	? -EFAULT : 0;
	248	kfree(tmp_buf);
	249	return error;
	250	default:
	251	break;
1da177e4 LT	252	}
1da177e4 LT	253
8865c418 DW	254	if (compat) {
	255	#ifdef CONFIG_COMPAT
	256	struct compat_atmif_sioc __user *csioc = arg;
	257	compat_uptr_t carg;
	258
	259	sioc_len = &csioc->length;
	260	if (get_user(carg, &csioc->arg))
	261	return -EFAULT;
	262	buf = compat_ptr(carg);
	263
	264	if (get_user(len, &csioc->length))
	265	return -EFAULT;
	266	if (get_user(number, &csioc->number))
	267	return -EFAULT;
	268	#endif
	269	} else {
	270	struct atmif_sioc __user *sioc = arg;
	271
	272	sioc_len = &sioc->length;
	273	if (get_user(buf, &sioc->arg))
	274	return -EFAULT;
	275	if (get_user(len, &sioc->length))
	276	return -EFAULT;
	277	if (get_user(number, &sioc->number))
	278	return -EFAULT;
	279	}
07b54c9a JP	280
	281	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
	282	number);
	283	if (!dev)
1da177e4	284	return -ENODEV;
f7d57453	285
1da177e4	286	switch (cmd) {
07b54c9a JP	287	case ATM_GETTYPE:
	288	size = strlen(dev->type) + 1;
	289	if (copy_to_user(buf, dev->type, size)) {
	290	error = -EFAULT;
	291	goto done;
	292	}
	293	break;
	294	case ATM_GETESI:
	295	size = ESI_LEN;
	296	if (copy_to_user(buf, dev->esi, size)) {
	297	error = -EFAULT;
	298	goto done;
	299	}
	300	break;
	301	case ATM_SETESI:
	302	{
	303	int i;
	304
	305	for (i = 0; i < ESI_LEN; i++)
	306	if (dev->esi[i]) {
	307	error = -EEXIST;
1da177e4 LT	308	goto done;
1da177e4 LT	309	}
07b54c9a JP	310	}
	311	/* fall through */
	312	case ATM_SETESIF:
	313	{
	314	unsigned char esi[ESI_LEN];
	315
	316	if (!capable(CAP_NET_ADMIN)) {
	317	error = -EPERM;
	318	goto done;
	319	}
	320	if (copy_from_user(esi, buf, ESI_LEN)) {
	321	error = -EFAULT;
	322	goto done;
	323	}
	324	memcpy(dev->esi, esi, ESI_LEN);
	325	error = ESI_LEN;
	326	goto done;
	327	}
	328	case ATM_GETSTATZ:
	329	if (!capable(CAP_NET_ADMIN)) {
	330	error = -EPERM;
	331	goto done;
	332	}
	333	/* fall through */
	334	case ATM_GETSTAT:
	335	size = sizeof(struct atm_dev_stats);
	336	error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
	337	if (error)
	338	goto done;
	339	break;
	340	case ATM_GETCIRANGE:
	341	size = sizeof(struct atm_cirange);
	342	if (copy_to_user(buf, &dev->ci_range, size)) {
	343	error = -EFAULT;
	344	goto done;
	345	}
	346	break;
	347	case ATM_GETLINKRATE:
	348	size = sizeof(int);
	349	if (copy_to_user(buf, &dev->link_rate, size)) {
	350	error = -EFAULT;
	351	goto done;
	352	}
	353	break;
	354	case ATM_RSTADDR:
	355	if (!capable(CAP_NET_ADMIN)) {
	356	error = -EPERM;
	357	goto done;
	358	}
	359	atm_reset_addr(dev, ATM_ADDR_LOCAL);
	360	break;
	361	case ATM_ADDADDR:
	362	case ATM_DELADDR:
	363	case ATM_ADDLECSADDR:
	364	case ATM_DELLECSADDR:
	365	{
	366	struct sockaddr_atmsvc addr;
	367
	368	if (!capable(CAP_NET_ADMIN)) {
	369	error = -EPERM;
	370	goto done;
	371	}
	372
	373	if (copy_from_user(&addr, buf, sizeof(addr))) {
374	error = -EFAULT;
375	goto done;
376	}
377	if (cmd == ATM_ADDADDR \|\| cmd == ATM_ADDLECSADDR)
378	error = atm_add_addr(dev, &addr,
379	(cmd == ATM_ADDADDR ?
0f21ba7c	380	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
07b54c9a JP	381	else
	382	error = atm_del_addr(dev, &addr,
	383	(cmd == ATM_DELADDR ?
	384	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	385	goto done;
	386	}
	387	case ATM_GETADDR:
	388	case ATM_GETLECSADDR:
	389	error = atm_get_addr(dev, buf, len,
	390	(cmd == ATM_GETADDR ?
	391	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	392	if (error < 0)
	393	goto done;
	394	size = error;
	395	/* may return 0, but later on size == 0 means "don't
	396	write the length" */
	397	error = put_user(size, sioc_len) ? -EFAULT : 0;
	398	goto done;
	399	case ATM_SETLOOP:
	400	if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
	401	__ATM_LM_XTLOC((int) (unsigned long) buf) >
	402	__ATM_LM_XTRMT((int) (unsigned long) buf)) {
	403	error = -EINVAL;
1da177e4	404	goto done;
07b54c9a JP	405	}
	406	/* fall through */
	407	case ATM_SETCIRANGE:
	408	case SONET_GETSTATZ:
	409	case SONET_SETDIAG:
	410	case SONET_CLRDIAG:
	411	case SONET_SETFRAMING:
	412	if (!capable(CAP_NET_ADMIN)) {
	413	error = -EPERM;
	414	goto done;
	415	}
	416	/* fall through */
	417	default:
	418	if (compat) {
	419	#ifdef CONFIG_COMPAT
	420	if (!dev->ops->compat_ioctl) {
1da177e4 LT	421	error = -EINVAL;
	422	goto done;
	423	}
07b54c9a	424	size = dev->ops->compat_ioctl(dev, cmd, buf);
8865c418	425	#endif
07b54c9a JP	426	} else {
	427	if (!dev->ops->ioctl) {
	428	error = -EINVAL;
1da177e4 LT	429	goto done;
1da177e4 LT	430	}
07b54c9a JP	431	size = dev->ops->ioctl(dev, cmd, buf);
	432	}
	433	if (size < 0) {
	434	error = (size == -ENOIOCTLCMD ? -EINVAL : size);
	435	goto done;
	436	}
1da177e4	437	}
f7d57453	438
1da177e4	439	if (size)
07b54c9a	440	error = put_user(size, sioc_len) ? -EFAULT : 0;
1da177e4 LT	441	else
	442	error = 0;
	443	done:
	444	atm_dev_put(dev);
	445	return error;
	446	}
	447
1da177e4 LT	448	void atm_dev_seq_start(struct seq_file seq, loff_t *pos)
1da177e4 LT	449	{
f7d57453	450	mutex_lock(&atm_dev_mutex);
67de7924	451	return seq_list_start_head(&atm_devs, *pos);
1da177e4 LT	452	}
	453
	454	void atm_dev_seq_stop(struct seq_file seq, void v)
	455	{
f7d57453	456	mutex_unlock(&atm_dev_mutex);
1da177e4	457	}
f7d57453	458
1da177e4 LT	459	void atm_dev_seq_next(struct seq_file seq, void v, loff_t pos)
1da177e4 LT	460	{
67de7924	461	return seq_list_next(v, &atm_devs, pos);
1da177e4	462	}