[linux.git] / net / atm / resources.c

// 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 <[email protected]>
 * 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_getnames(void __user *buf, int __user *iobuf_len)
{
	int error, len, size = 0;
	struct atm_dev *dev;
	struct list_head *p;
	int *tmp_buf, *tmp_p;

	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;
}

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

	if (get_user(len, sioc_len))
		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 (IS_ENABLED(CONFIG_COMPAT) && 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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/* net/atm/resources.c - Statically allocated resources */
	3
	4	/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
	5
	6	/* Fixes
	7	* Arnaldo Carvalho de Melo <[email protected]>
	8	* 2002/01 - don't free the whole struct sock on sk->destruct time,
	9	* use the default destruct function initialized by sock_init_data */
	10
99824461	11	#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
1da177e4	12
1da177e4 LT	13	#include <linux/ctype.h>
	14	#include <linux/string.h>
	15	#include <linux/atmdev.h>
	16	#include <linux/sonet.h>
	17	#include <linux/kernel.h> /* for barrier */
	18	#include <linux/module.h>
	19	#include <linux/bitops.h>
4fc268d2	20	#include <linux/capability.h>
1da177e4	21	#include <linux/delay.h>
57b47a53	22	#include <linux/mutex.h>
5a0e3ad6	23	#include <linux/slab.h>
57b47a53	24
1da177e4 LT	25	#include <net/sock.h> /* for struct sock */
	26
	27	#include "common.h"
	28	#include "resources.h"
	29	#include "addr.h"
	30
	31
	32	LIST_HEAD(atm_devs);
57b47a53	33	DEFINE_MUTEX(atm_dev_mutex);
1da177e4 LT	34
	35	static struct atm_dev __alloc_atm_dev(const char type)
	36	{
	37	struct atm_dev *dev;
	38
0da974f4	39	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	40	if (!dev)
1da177e4 LT	41	return NULL;
1da177e4 LT	42	dev->type = type;
	43	dev->signal = ATM_PHY_SIG_UNKNOWN;
	44	dev->link_rate = ATM_OC3_PCR;
	45	spin_lock_init(&dev->lock);
	46	INIT_LIST_HEAD(&dev->local);
0f21ba7c	47	INIT_LIST_HEAD(&dev->lecs);
1da177e4 LT	48
	49	return dev;
	50	}
	51
1da177e4 LT	52	static struct atm_dev *__atm_dev_lookup(int number)
	53	{
	54	struct atm_dev *dev;
	55	struct list_head *p;
	56
	57	list_for_each(p, &atm_devs) {
	58	dev = list_entry(p, struct atm_dev, dev_list);
aaaaaadb	59	if (dev->number == number) {
1da177e4 LT	60	atm_dev_hold(dev);
	61	return dev;
	62	}
	63	}
	64	return NULL;
	65	}
	66
	67	struct atm_dev *atm_dev_lookup(int number)
	68	{
	69	struct atm_dev *dev;
	70
57b47a53	71	mutex_lock(&atm_dev_mutex);
1da177e4	72	dev = __atm_dev_lookup(number);
57b47a53	73	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	74	return dev;
1da177e4 LT	75	}
07b54c9a	76	EXPORT_SYMBOL(atm_dev_lookup);
64bf69dd	77
d9ca676b DW	78	struct atm_dev atm_dev_register(const char type, struct device *parent,
	79	const struct atmdev_ops *ops, int number,
	80	unsigned long *flags)
1da177e4 LT	81	{
	82	struct atm_dev dev, inuse;
	83
	84	dev = __alloc_atm_dev(type);
	85	if (!dev) {
99824461	86	pr_err("no space for dev %s\n", type);
1da177e4 LT	87	return NULL;
1da177e4 LT	88	}
57b47a53	89	mutex_lock(&atm_dev_mutex);
1da177e4	90	if (number != -1) {
07b54c9a JP	91	inuse = __atm_dev_lookup(number);
07b54c9a JP	92	if (inuse) {
1da177e4	93	atm_dev_put(inuse);
57b47a53	94	mutex_unlock(&atm_dev_mutex);
ebc37b61	95	kfree(dev);
1da177e4 LT	96	return NULL;
	97	}
	98	dev->number = number;
	99	} else {
	100	dev->number = 0;
	101	while ((inuse = __atm_dev_lookup(dev->number))) {
	102	atm_dev_put(inuse);
	103	dev->number++;
	104	}
	105	}
	106
	107	dev->ops = ops;
	108	if (flags)
	109	dev->flags = *flags;
	110	else
	111	memset(&dev->flags, 0, sizeof(dev->flags));
	112	memset(&dev->stats, 0, sizeof(dev->stats));
458bc30c	113	refcount_set(&dev->refcnt, 1);
1da177e4 LT	114
1da177e4 LT	115	if (atm_proc_dev_register(dev) < 0) {
99824461	116	pr_err("atm_proc_dev_register failed for dev %s\n", type);
656d98b0 RK	117	goto out_fail;
	118	}
	119
d9ca676b	120	if (atm_register_sysfs(dev, parent) < 0) {
99824461	121	pr_err("atm_register_sysfs failed for dev %s\n", type);
656d98b0 RK	122	atm_proc_dev_deregister(dev);
656d98b0 RK	123	goto out_fail;
1da177e4	124	}
656d98b0	125
aaaaaadb	126	list_add_tail(&dev->dev_list, &atm_devs);
1da177e4	127
656d98b0 RK	128	out:
656d98b0 RK	129	mutex_unlock(&atm_dev_mutex);
1da177e4	130	return dev;
656d98b0 RK	131
	132	out_fail:
	133	kfree(dev);
	134	dev = NULL;
	135	goto out;
1da177e4	136	}
07b54c9a	137	EXPORT_SYMBOL(atm_dev_register);
1da177e4 LT	138
	139	void atm_dev_deregister(struct atm_dev *dev)
	140	{
64bf69dd SG	141	BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
	142	set_bit(ATM_DF_REMOVED, &dev->flags);
	143
	144	/*
f7d57453 YH	145	* if we remove current device from atm_devs list, new device
f7d57453 YH	146	* with same number can appear, such we need deregister proc,
64bf69dd SG	147	* release async all vccs and remove them from vccs list too
64bf69dd SG	148	*/
57b47a53	149	mutex_lock(&atm_dev_mutex);
1da177e4	150	list_del(&dev->dev_list);
57b47a53	151	mutex_unlock(&atm_dev_mutex);
1da177e4	152
64bf69dd	153	atm_dev_release_vccs(dev);
656d98b0	154	atm_unregister_sysfs(dev);
64bf69dd	155	atm_proc_dev_deregister(dev);
1da177e4	156
64bf69dd	157	atm_dev_put(dev);
1da177e4	158	}
07b54c9a	159	EXPORT_SYMBOL(atm_dev_deregister);
1da177e4 LT	160
	161	static void copy_aal_stats(struct k_atm_aal_stats *from,
	162	struct atm_aal_stats *to)
	163	{
	164	#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
	165	__AAL_STAT_ITEMS
	166	#undef __HANDLE_ITEM
	167	}
	168
1da177e4 LT	169	static void subtract_aal_stats(struct k_atm_aal_stats *from,
	170	struct atm_aal_stats *to)
	171	{
	172	#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
	173	__AAL_STAT_ITEMS
	174	#undef __HANDLE_ITEM
	175	}
	176
07b54c9a JP	177	static int fetch_stats(struct atm_dev dev, struct atm_dev_stats __user arg,
07b54c9a JP	178	int zero)
1da177e4 LT	179	{
	180	struct atm_dev_stats tmp;
	181	int error = 0;
	182
	183	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
	184	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
	185	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
	186	if (arg)
	187	error = copy_to_user(arg, &tmp, sizeof(tmp));
	188	if (zero && !error) {
	189	subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
	190	subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
	191	subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
	192	}
	193	return error ? -EFAULT : 0;
	194	}
	195
a3929484	196	int atm_getnames(void __user buf, int __user iobuf_len)
1da177e4	197	{
8c2348e3	198	int error, len, size = 0;
1da177e4 LT	199	struct atm_dev *dev;
	200	struct list_head *p;
	201	int tmp_buf, tmp_p;
a3929484	202
8c2348e3 AV	203	if (get_user(len, iobuf_len))
	204	return -EFAULT;
	205	mutex_lock(&atm_dev_mutex);
	206	list_for_each(p, &atm_devs)
	207	size += sizeof(int);
	208	if (size > len) {
07b54c9a	209	mutex_unlock(&atm_dev_mutex);
8c2348e3	210	return -E2BIG;
1da177e4	211	}
8c2348e3 AV	212	tmp_buf = kmalloc(size, GFP_ATOMIC);
	213	if (!tmp_buf) {
	214	mutex_unlock(&atm_dev_mutex);
	215	return -ENOMEM;
	216	}
	217	tmp_p = tmp_buf;
	218	list_for_each(p, &atm_devs) {
	219	dev = list_entry(p, struct atm_dev, dev_list);
	220	*tmp_p++ = dev->number;
	221	}
	222	mutex_unlock(&atm_dev_mutex);
	223	error = ((copy_to_user(buf, tmp_buf, size)) \|\|
	224	put_user(size, iobuf_len))
	225	? -EFAULT : 0;
	226	kfree(tmp_buf);
	227	return error;
	228	}
	229
8cacb416 AV	230	int atm_dev_ioctl(unsigned int cmd, void __user buf, int __user sioc_len,
8cacb416 AV	231	int number, int compat)
8c2348e3	232	{
8cacb416	233	int error, len, size = 0;
8c2348e3	234	struct atm_dev *dev;
8cacb416 AV	235
	236	if (get_user(len, sioc_len))
	237	return -EFAULT;
07b54c9a JP	238
	239	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
	240	number);
	241	if (!dev)
1da177e4	242	return -ENODEV;
f7d57453	243
1da177e4	244	switch (cmd) {
07b54c9a JP	245	case ATM_GETTYPE:
	246	size = strlen(dev->type) + 1;
	247	if (copy_to_user(buf, dev->type, size)) {
	248	error = -EFAULT;
	249	goto done;
	250	}
	251	break;
	252	case ATM_GETESI:
	253	size = ESI_LEN;
	254	if (copy_to_user(buf, dev->esi, size)) {
	255	error = -EFAULT;
	256	goto done;
	257	}
	258	break;
	259	case ATM_SETESI:
	260	{
	261	int i;
	262
	263	for (i = 0; i < ESI_LEN; i++)
	264	if (dev->esi[i]) {
	265	error = -EEXIST;
1da177e4 LT	266	goto done;
1da177e4 LT	267	}
07b54c9a JP	268	}
	269	/* fall through */
	270	case ATM_SETESIF:
	271	{
	272	unsigned char esi[ESI_LEN];
	273
	274	if (!capable(CAP_NET_ADMIN)) {
	275	error = -EPERM;
	276	goto done;
	277	}
	278	if (copy_from_user(esi, buf, ESI_LEN)) {
	279	error = -EFAULT;
	280	goto done;
	281	}
	282	memcpy(dev->esi, esi, ESI_LEN);
	283	error = ESI_LEN;
	284	goto done;
	285	}
	286	case ATM_GETSTATZ:
	287	if (!capable(CAP_NET_ADMIN)) {
	288	error = -EPERM;
	289	goto done;
	290	}
	291	/* fall through */
	292	case ATM_GETSTAT:
	293	size = sizeof(struct atm_dev_stats);
	294	error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
	295	if (error)
	296	goto done;
	297	break;
	298	case ATM_GETCIRANGE:
	299	size = sizeof(struct atm_cirange);
	300	if (copy_to_user(buf, &dev->ci_range, size)) {
	301	error = -EFAULT;
	302	goto done;
	303	}
	304	break;
	305	case ATM_GETLINKRATE:
	306	size = sizeof(int);
	307	if (copy_to_user(buf, &dev->link_rate, size)) {
	308	error = -EFAULT;
	309	goto done;
	310	}
	311	break;
	312	case ATM_RSTADDR:
	313	if (!capable(CAP_NET_ADMIN)) {
	314	error = -EPERM;
	315	goto done;
	316	}
	317	atm_reset_addr(dev, ATM_ADDR_LOCAL);
	318	break;
	319	case ATM_ADDADDR:
	320	case ATM_DELADDR:
	321	case ATM_ADDLECSADDR:
	322	case ATM_DELLECSADDR:
	323	{
	324	struct sockaddr_atmsvc addr;
	325
	326	if (!capable(CAP_NET_ADMIN)) {
	327	error = -EPERM;
	328	goto done;
	329	}
	330
	331	if (copy_from_user(&addr, buf, sizeof(addr))) {
332	error = -EFAULT;
333	goto done;
334	}
335	if (cmd == ATM_ADDADDR \|\| cmd == ATM_ADDLECSADDR)
336	error = atm_add_addr(dev, &addr,
337	(cmd == ATM_ADDADDR ?
0f21ba7c	338	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
07b54c9a JP	339	else
	340	error = atm_del_addr(dev, &addr,
	341	(cmd == ATM_DELADDR ?
	342	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	343	goto done;
	344	}
	345	case ATM_GETADDR:
	346	case ATM_GETLECSADDR:
	347	error = atm_get_addr(dev, buf, len,
	348	(cmd == ATM_GETADDR ?
	349	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	350	if (error < 0)
	351	goto done;
	352	size = error;
	353	/* may return 0, but later on size == 0 means "don't
	354	write the length" */
	355	error = put_user(size, sioc_len) ? -EFAULT : 0;
	356	goto done;
	357	case ATM_SETLOOP:
	358	if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
	359	__ATM_LM_XTLOC((int) (unsigned long) buf) >
	360	__ATM_LM_XTRMT((int) (unsigned long) buf)) {
	361	error = -EINVAL;
1da177e4	362	goto done;
07b54c9a JP	363	}
	364	/* fall through */
	365	case ATM_SETCIRANGE:
	366	case SONET_GETSTATZ:
	367	case SONET_SETDIAG:
	368	case SONET_CLRDIAG:
	369	case SONET_SETFRAMING:
	370	if (!capable(CAP_NET_ADMIN)) {
	371	error = -EPERM;
	372	goto done;
	373	}
	374	/* fall through */
	375	default:
0805a4b8	376	if (IS_ENABLED(CONFIG_COMPAT) && compat) {
07b54c9a JP	377	#ifdef CONFIG_COMPAT
07b54c9a JP	378	if (!dev->ops->compat_ioctl) {
1da177e4 LT	379	error = -EINVAL;
	380	goto done;
	381	}
07b54c9a	382	size = dev->ops->compat_ioctl(dev, cmd, buf);
8865c418	383	#endif
07b54c9a JP	384	} else {
	385	if (!dev->ops->ioctl) {
	386	error = -EINVAL;
1da177e4 LT	387	goto done;
1da177e4 LT	388	}
07b54c9a JP	389	size = dev->ops->ioctl(dev, cmd, buf);
	390	}
	391	if (size < 0) {
4a2c2406	392	error = (size == -ENOIOCTLCMD ? -ENOTTY : size);
07b54c9a JP	393	goto done;
07b54c9a JP	394	}
1da177e4	395	}
f7d57453	396
1da177e4	397	if (size)
07b54c9a	398	error = put_user(size, sioc_len) ? -EFAULT : 0;
1da177e4 LT	399	else
	400	error = 0;
	401	done:
	402	atm_dev_put(dev);
	403	return error;
	404	}
	405
1da177e4 LT	406	void atm_dev_seq_start(struct seq_file seq, loff_t *pos)
1da177e4 LT	407	{
f7d57453	408	mutex_lock(&atm_dev_mutex);
67de7924	409	return seq_list_start_head(&atm_devs, *pos);
1da177e4 LT	410	}
	411
	412	void atm_dev_seq_stop(struct seq_file seq, void v)
	413	{
f7d57453	414	mutex_unlock(&atm_dev_mutex);
1da177e4	415	}
f7d57453	416
1da177e4 LT	417	void atm_dev_seq_next(struct seq_file seq, void v, loff_t pos)
1da177e4 LT	418	{
67de7924	419	return seq_list_next(v, &atm_devs, pos);
1da177e4	420	}