[linux-2.6-block.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 <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;

	switch (cmd) {
	case ATM_GETNAMES:
		if (IS_ENABLED(CONFIG_COMPAT) && 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 (IS_ENABLED(CONFIG_COMPAT) && 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 (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 <acme@conectiva.com.br>
	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
8865c418	196	int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
1da177e4 LT	197	{
	198	void __user *buf;
	199	int error, len, number, size = 0;
	200	struct atm_dev *dev;
	201	struct list_head *p;
	202	int tmp_buf, tmp_p;
8865c418 DW	203	int __user *sioc_len;
	204	int __user *iobuf_len;
	205
1da177e4	206	switch (cmd) {
07b54c9a	207	case ATM_GETNAMES:
f9d19a74	208	if (IS_ENABLED(CONFIG_COMPAT) && compat) {
8865c418	209	#ifdef CONFIG_COMPAT
07b54c9a JP	210	struct compat_atm_iobuf __user *ciobuf = arg;
	211	compat_uptr_t cbuf;
	212	iobuf_len = &ciobuf->length;
	213	if (get_user(cbuf, &ciobuf->buffer))
	214	return -EFAULT;
	215	buf = compat_ptr(cbuf);
8865c418	216	#endif
07b54c9a JP	217	} else {
	218	struct atm_iobuf __user *iobuf = arg;
	219	iobuf_len = &iobuf->length;
	220	if (get_user(buf, &iobuf->buffer))
1da177e4	221	return -EFAULT;
07b54c9a JP	222	}
	223	if (get_user(len, iobuf_len))
	224	return -EFAULT;
	225	mutex_lock(&atm_dev_mutex);
	226	list_for_each(p, &atm_devs)
	227	size += sizeof(int);
	228	if (size > len) {
57b47a53	229	mutex_unlock(&atm_dev_mutex);
07b54c9a JP	230	return -E2BIG;
	231	}
	232	tmp_buf = kmalloc(size, GFP_ATOMIC);
	233	if (!tmp_buf) {
	234	mutex_unlock(&atm_dev_mutex);
	235	return -ENOMEM;
	236	}
	237	tmp_p = tmp_buf;
	238	list_for_each(p, &atm_devs) {
	239	dev = list_entry(p, struct atm_dev, dev_list);
	240	*tmp_p++ = dev->number;
	241	}
	242	mutex_unlock(&atm_dev_mutex);
	243	error = ((copy_to_user(buf, tmp_buf, size)) \|\|
	244	put_user(size, iobuf_len))
	245	? -EFAULT : 0;
	246	kfree(tmp_buf);
	247	return error;
	248	default:
	249	break;
1da177e4 LT	250	}
1da177e4 LT	251
f9d19a74	252	if (IS_ENABLED(CONFIG_COMPAT) && compat) {
8865c418 DW	253	#ifdef CONFIG_COMPAT
	254	struct compat_atmif_sioc __user *csioc = arg;
	255	compat_uptr_t carg;
	256
	257	sioc_len = &csioc->length;
	258	if (get_user(carg, &csioc->arg))
	259	return -EFAULT;
	260	buf = compat_ptr(carg);
	261
	262	if (get_user(len, &csioc->length))
	263	return -EFAULT;
	264	if (get_user(number, &csioc->number))
	265	return -EFAULT;
	266	#endif
	267	} else {
	268	struct atmif_sioc __user *sioc = arg;
	269
	270	sioc_len = &sioc->length;
	271	if (get_user(buf, &sioc->arg))
	272	return -EFAULT;
	273	if (get_user(len, &sioc->length))
	274	return -EFAULT;
	275	if (get_user(number, &sioc->number))
	276	return -EFAULT;
	277	}
07b54c9a JP	278
	279	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
	280	number);
	281	if (!dev)
1da177e4	282	return -ENODEV;
f7d57453	283
1da177e4	284	switch (cmd) {
07b54c9a JP	285	case ATM_GETTYPE:
	286	size = strlen(dev->type) + 1;
	287	if (copy_to_user(buf, dev->type, size)) {
	288	error = -EFAULT;
	289	goto done;
	290	}
	291	break;
	292	case ATM_GETESI:
	293	size = ESI_LEN;
	294	if (copy_to_user(buf, dev->esi, size)) {
	295	error = -EFAULT;
	296	goto done;
	297	}
	298	break;
	299	case ATM_SETESI:
	300	{
	301	int i;
	302
	303	for (i = 0; i < ESI_LEN; i++)
	304	if (dev->esi[i]) {
	305	error = -EEXIST;
1da177e4 LT	306	goto done;
1da177e4 LT	307	}
07b54c9a JP	308	}
	309	/* fall through */
	310	case ATM_SETESIF:
	311	{
	312	unsigned char esi[ESI_LEN];
	313
	314	if (!capable(CAP_NET_ADMIN)) {
	315	error = -EPERM;
	316	goto done;
	317	}
	318	if (copy_from_user(esi, buf, ESI_LEN)) {
	319	error = -EFAULT;
	320	goto done;
	321	}
	322	memcpy(dev->esi, esi, ESI_LEN);
	323	error = ESI_LEN;
	324	goto done;
	325	}
	326	case ATM_GETSTATZ:
	327	if (!capable(CAP_NET_ADMIN)) {
	328	error = -EPERM;
	329	goto done;
	330	}
	331	/* fall through */
	332	case ATM_GETSTAT:
	333	size = sizeof(struct atm_dev_stats);
	334	error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
	335	if (error)
	336	goto done;
	337	break;
	338	case ATM_GETCIRANGE:
	339	size = sizeof(struct atm_cirange);
	340	if (copy_to_user(buf, &dev->ci_range, size)) {
	341	error = -EFAULT;
	342	goto done;
	343	}
	344	break;
	345	case ATM_GETLINKRATE:
	346	size = sizeof(int);
	347	if (copy_to_user(buf, &dev->link_rate, size)) {
	348	error = -EFAULT;
	349	goto done;
	350	}
	351	break;
	352	case ATM_RSTADDR:
	353	if (!capable(CAP_NET_ADMIN)) {
	354	error = -EPERM;
	355	goto done;
	356	}
	357	atm_reset_addr(dev, ATM_ADDR_LOCAL);
	358	break;
	359	case ATM_ADDADDR:
	360	case ATM_DELADDR:
	361	case ATM_ADDLECSADDR:
	362	case ATM_DELLECSADDR:
	363	{
	364	struct sockaddr_atmsvc addr;
	365
	366	if (!capable(CAP_NET_ADMIN)) {
	367	error = -EPERM;
	368	goto done;
	369	}
	370
	371	if (copy_from_user(&addr, buf, sizeof(addr))) {
372	error = -EFAULT;
373	goto done;
374	}
375	if (cmd == ATM_ADDADDR \|\| cmd == ATM_ADDLECSADDR)
376	error = atm_add_addr(dev, &addr,
377	(cmd == ATM_ADDADDR ?
0f21ba7c	378	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
07b54c9a JP	379	else
	380	error = atm_del_addr(dev, &addr,
	381	(cmd == ATM_DELADDR ?
	382	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	383	goto done;
	384	}
	385	case ATM_GETADDR:
	386	case ATM_GETLECSADDR:
	387	error = atm_get_addr(dev, buf, len,
	388	(cmd == ATM_GETADDR ?
	389	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	390	if (error < 0)
	391	goto done;
	392	size = error;
	393	/* may return 0, but later on size == 0 means "don't
	394	write the length" */
	395	error = put_user(size, sioc_len) ? -EFAULT : 0;
	396	goto done;
	397	case ATM_SETLOOP:
	398	if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
	399	__ATM_LM_XTLOC((int) (unsigned long) buf) >
	400	__ATM_LM_XTRMT((int) (unsigned long) buf)) {
	401	error = -EINVAL;
1da177e4	402	goto done;
07b54c9a JP	403	}
	404	/* fall through */
	405	case ATM_SETCIRANGE:
	406	case SONET_GETSTATZ:
	407	case SONET_SETDIAG:
	408	case SONET_CLRDIAG:
	409	case SONET_SETFRAMING:
	410	if (!capable(CAP_NET_ADMIN)) {
	411	error = -EPERM;
	412	goto done;
	413	}
	414	/* fall through */
	415	default:
0805a4b8	416	if (IS_ENABLED(CONFIG_COMPAT) && compat) {
07b54c9a JP	417	#ifdef CONFIG_COMPAT
07b54c9a JP	418	if (!dev->ops->compat_ioctl) {
1da177e4 LT	419	error = -EINVAL;
	420	goto done;
	421	}
07b54c9a	422	size = dev->ops->compat_ioctl(dev, cmd, buf);
8865c418	423	#endif
07b54c9a JP	424	} else {
	425	if (!dev->ops->ioctl) {
	426	error = -EINVAL;
1da177e4 LT	427	goto done;
1da177e4 LT	428	}
07b54c9a JP	429	size = dev->ops->ioctl(dev, cmd, buf);
	430	}
	431	if (size < 0) {
4a2c2406	432	error = (size == -ENOIOCTLCMD ? -ENOTTY : size);
07b54c9a JP	433	goto done;
07b54c9a JP	434	}
1da177e4	435	}
f7d57453	436
1da177e4	437	if (size)
07b54c9a	438	error = put_user(size, sioc_len) ? -EFAULT : 0;
1da177e4 LT	439	else
	440	error = 0;
	441	done:
	442	atm_dev_put(dev);
	443	return error;
	444	}
	445
1da177e4 LT	446	void atm_dev_seq_start(struct seq_file seq, loff_t *pos)
1da177e4 LT	447	{
f7d57453	448	mutex_lock(&atm_dev_mutex);
67de7924	449	return seq_list_start_head(&atm_devs, *pos);
1da177e4 LT	450	}
	451
	452	void atm_dev_seq_stop(struct seq_file seq, void v)
	453	{
f7d57453	454	mutex_unlock(&atm_dev_mutex);
1da177e4	455	}
f7d57453	456
1da177e4 LT	457	void atm_dev_seq_next(struct seq_file seq, void v, loff_t pos)
1da177e4 LT	458	{
67de7924	459	return seq_list_next(v, &atm_devs, pos);
1da177e4	460	}