net/atm/resources.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /* 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));
 	refcount_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);
 }
	// SPDX-License-Identifier: GPL-2.0
	/* 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));
	refcount_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);
	}