[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;

	list_for_each_entry(dev, &atm_devs, 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_entry(dev, &atm_devs, 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;
			}
	}
		fallthrough;
	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;
		}
		fallthrough;
	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;
		}
		fallthrough;
	case ATM_SETCIRANGE:
	case SONET_GETSTATZ:
	case SONET_SETDIAG:
	case SONET_CLRDIAG:
	case SONET_SETFRAMING:
		if (!capable(CAP_NET_ADMIN)) {
			error = -EPERM;
			goto done;
		}
		fallthrough;
	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;
1da177e4	55
73e42909	56	list_for_each_entry(dev, &atm_devs, dev_list) {
aaaaaadb	57	if (dev->number == number) {
1da177e4 LT	58	atm_dev_hold(dev);
	59	return dev;
	60	}
	61	}
	62	return NULL;
	63	}
	64
	65	struct atm_dev *atm_dev_lookup(int number)
	66	{
	67	struct atm_dev *dev;
	68
57b47a53	69	mutex_lock(&atm_dev_mutex);
1da177e4	70	dev = __atm_dev_lookup(number);
57b47a53	71	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	72	return dev;
1da177e4 LT	73	}
07b54c9a	74	EXPORT_SYMBOL(atm_dev_lookup);
64bf69dd	75
d9ca676b DW	76	struct atm_dev atm_dev_register(const char type, struct device *parent,
	77	const struct atmdev_ops *ops, int number,
	78	unsigned long *flags)
1da177e4 LT	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));
458bc30c	111	refcount_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
d9ca676b	118	if (atm_register_sysfs(dev, parent) < 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
a3929484	194	int atm_getnames(void __user buf, int __user iobuf_len)
1da177e4	195	{
8c2348e3	196	int error, len, size = 0;
1da177e4 LT	197	struct atm_dev *dev;
	198	struct list_head *p;
	199	int tmp_buf, tmp_p;
a3929484	200
8c2348e3 AV	201	if (get_user(len, iobuf_len))
	202	return -EFAULT;
	203	mutex_lock(&atm_dev_mutex);
	204	list_for_each(p, &atm_devs)
	205	size += sizeof(int);
	206	if (size > len) {
07b54c9a	207	mutex_unlock(&atm_dev_mutex);
8c2348e3	208	return -E2BIG;
1da177e4	209	}
8c2348e3 AV	210	tmp_buf = kmalloc(size, GFP_ATOMIC);
	211	if (!tmp_buf) {
	212	mutex_unlock(&atm_dev_mutex);
	213	return -ENOMEM;
	214	}
	215	tmp_p = tmp_buf;
73e42909	216	list_for_each_entry(dev, &atm_devs, dev_list) {
8c2348e3 AV	217	*tmp_p++ = dev->number;
	218	}
	219	mutex_unlock(&atm_dev_mutex);
	220	error = ((copy_to_user(buf, tmp_buf, size)) \|\|
	221	put_user(size, iobuf_len))
	222	? -EFAULT : 0;
	223	kfree(tmp_buf);
	224	return error;
	225	}
	226
8cacb416 AV	227	int atm_dev_ioctl(unsigned int cmd, void __user buf, int __user sioc_len,
8cacb416 AV	228	int number, int compat)
8c2348e3	229	{
8cacb416	230	int error, len, size = 0;
8c2348e3	231	struct atm_dev *dev;
8cacb416 AV	232
	233	if (get_user(len, sioc_len))
	234	return -EFAULT;
07b54c9a JP	235
	236	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
	237	number);
	238	if (!dev)
1da177e4	239	return -ENODEV;
f7d57453	240
1da177e4	241	switch (cmd) {
07b54c9a JP	242	case ATM_GETTYPE:
	243	size = strlen(dev->type) + 1;
	244	if (copy_to_user(buf, dev->type, size)) {
	245	error = -EFAULT;
	246	goto done;
	247	}
	248	break;
	249	case ATM_GETESI:
	250	size = ESI_LEN;
	251	if (copy_to_user(buf, dev->esi, size)) {
	252	error = -EFAULT;
	253	goto done;
	254	}
	255	break;
	256	case ATM_SETESI:
	257	{
	258	int i;
	259
	260	for (i = 0; i < ESI_LEN; i++)
	261	if (dev->esi[i]) {
	262	error = -EEXIST;
1da177e4 LT	263	goto done;
1da177e4 LT	264	}
07b54c9a	265	}
df561f66	266	fallthrough;
07b54c9a JP	267	case ATM_SETESIF:
	268	{
	269	unsigned char esi[ESI_LEN];
	270
	271	if (!capable(CAP_NET_ADMIN)) {
	272	error = -EPERM;
	273	goto done;
	274	}
	275	if (copy_from_user(esi, buf, ESI_LEN)) {
	276	error = -EFAULT;
	277	goto done;
	278	}
	279	memcpy(dev->esi, esi, ESI_LEN);
	280	error = ESI_LEN;
	281	goto done;
	282	}
	283	case ATM_GETSTATZ:
	284	if (!capable(CAP_NET_ADMIN)) {
	285	error = -EPERM;
	286	goto done;
	287	}
df561f66	288	fallthrough;
07b54c9a JP	289	case ATM_GETSTAT:
	290	size = sizeof(struct atm_dev_stats);
	291	error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
	292	if (error)
	293	goto done;
	294	break;
	295	case ATM_GETCIRANGE:
	296	size = sizeof(struct atm_cirange);
	297	if (copy_to_user(buf, &dev->ci_range, size)) {
	298	error = -EFAULT;
	299	goto done;
	300	}
	301	break;
	302	case ATM_GETLINKRATE:
	303	size = sizeof(int);
	304	if (copy_to_user(buf, &dev->link_rate, size)) {
	305	error = -EFAULT;
	306	goto done;
	307	}
	308	break;
	309	case ATM_RSTADDR:
	310	if (!capable(CAP_NET_ADMIN)) {
	311	error = -EPERM;
	312	goto done;
	313	}
	314	atm_reset_addr(dev, ATM_ADDR_LOCAL);
	315	break;
	316	case ATM_ADDADDR:
	317	case ATM_DELADDR:
	318	case ATM_ADDLECSADDR:
	319	case ATM_DELLECSADDR:
	320	{
	321	struct sockaddr_atmsvc addr;
	322
	323	if (!capable(CAP_NET_ADMIN)) {
	324	error = -EPERM;
	325	goto done;
	326	}
	327
	328	if (copy_from_user(&addr, buf, sizeof(addr))) {
	329	error = -EFAULT;
	330	goto done;
	331	}
	332	if (cmd == ATM_ADDADDR \|\| cmd == ATM_ADDLECSADDR)
	333	error = atm_add_addr(dev, &addr,
	334	(cmd == ATM_ADDADDR ?
0f21ba7c	335	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
07b54c9a JP	336	else
	337	error = atm_del_addr(dev, &addr,
	338	(cmd == ATM_DELADDR ?
	339	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	340	goto done;
	341	}
	342	case ATM_GETADDR:
	343	case ATM_GETLECSADDR:
	344	error = atm_get_addr(dev, buf, len,
	345	(cmd == ATM_GETADDR ?
	346	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	347	if (error < 0)
	348	goto done;
	349	size = error;
	350	/* may return 0, but later on size == 0 means "don't
	351	write the length" */
	352	error = put_user(size, sioc_len) ? -EFAULT : 0;
	353	goto done;
	354	case ATM_SETLOOP:
	355	if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
	356	__ATM_LM_XTLOC((int) (unsigned long) buf) >
	357	__ATM_LM_XTRMT((int) (unsigned long) buf)) {
	358	error = -EINVAL;
1da177e4	359	goto done;
07b54c9a	360	}
df561f66	361	fallthrough;
07b54c9a JP	362	case ATM_SETCIRANGE:
	363	case SONET_GETSTATZ:
	364	case SONET_SETDIAG:
	365	case SONET_CLRDIAG:
	366	case SONET_SETFRAMING:
	367	if (!capable(CAP_NET_ADMIN)) {
	368	error = -EPERM;
	369	goto done;
	370	}
df561f66	371	fallthrough;
07b54c9a	372	default:
0805a4b8	373	if (IS_ENABLED(CONFIG_COMPAT) && compat) {
07b54c9a JP	374	#ifdef CONFIG_COMPAT
07b54c9a JP	375	if (!dev->ops->compat_ioctl) {
1da177e4 LT	376	error = -EINVAL;
	377	goto done;
	378	}
07b54c9a	379	size = dev->ops->compat_ioctl(dev, cmd, buf);
8865c418	380	#endif
07b54c9a JP	381	} else {
	382	if (!dev->ops->ioctl) {
	383	error = -EINVAL;
1da177e4 LT	384	goto done;
1da177e4 LT	385	}
07b54c9a JP	386	size = dev->ops->ioctl(dev, cmd, buf);
	387	}
	388	if (size < 0) {
4a2c2406	389	error = (size == -ENOIOCTLCMD ? -ENOTTY : size);
07b54c9a JP	390	goto done;
07b54c9a JP	391	}
1da177e4	392	}
f7d57453	393
1da177e4	394	if (size)
07b54c9a	395	error = put_user(size, sioc_len) ? -EFAULT : 0;
1da177e4 LT	396	else
	397	error = 0;
	398	done:
	399	atm_dev_put(dev);
	400	return error;
	401	}
	402
1da177e4 LT	403	void atm_dev_seq_start(struct seq_file seq, loff_t *pos)
1da177e4 LT	404	{
f7d57453	405	mutex_lock(&atm_dev_mutex);
67de7924	406	return seq_list_start_head(&atm_devs, *pos);
1da177e4 LT	407	}
	408
	409	void atm_dev_seq_stop(struct seq_file seq, void v)
	410	{
f7d57453	411	mutex_unlock(&atm_dev_mutex);
1da177e4	412	}
f7d57453	413
1da177e4 LT	414	void atm_dev_seq_next(struct seq_file seq, void v, loff_t pos)
1da177e4 LT	415	{
67de7924	416	return seq_list_next(v, &atm_devs, pos);
1da177e4	417	}