[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 <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 IM	21	#include <linux/mutex.h>
57b47a53 IM	22
1da177e4 LT	23	#include <net/sock.h> /* for struct sock */
	24
	25	#include "common.h"
	26	#include "resources.h"
	27	#include "addr.h"
	28
	29
	30	LIST_HEAD(atm_devs);
57b47a53	31	DEFINE_MUTEX(atm_dev_mutex);
1da177e4 LT	32
	33	static struct atm_dev __alloc_atm_dev(const char type)
	34	{
	35	struct atm_dev *dev;
	36
0da974f4	37	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	38	if (!dev)
1da177e4 LT	39	return NULL;
1da177e4 LT	40	dev->type = type;
	41	dev->signal = ATM_PHY_SIG_UNKNOWN;
	42	dev->link_rate = ATM_OC3_PCR;
	43	spin_lock_init(&dev->lock);
	44	INIT_LIST_HEAD(&dev->local);
0f21ba7c	45	INIT_LIST_HEAD(&dev->lecs);
1da177e4 LT	46
	47	return dev;
	48	}
	49
1da177e4 LT	50	static struct atm_dev *__atm_dev_lookup(int number)
	51	{
	52	struct atm_dev *dev;
	53	struct list_head *p;
	54
	55	list_for_each(p, &atm_devs) {
	56	dev = list_entry(p, struct atm_dev, 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
1da177e4 LT	76	struct atm_dev atm_dev_register(const char type, const struct atmdev_ops *ops,
	77	int number, unsigned long *flags)
	78	{
	79	struct atm_dev dev, inuse;
	80
	81	dev = __alloc_atm_dev(type);
	82	if (!dev) {
99824461	83	pr_err("no space for dev %s\n", type);
1da177e4 LT	84	return NULL;
1da177e4 LT	85	}
57b47a53	86	mutex_lock(&atm_dev_mutex);
1da177e4	87	if (number != -1) {
07b54c9a JP	88	inuse = __atm_dev_lookup(number);
07b54c9a JP	89	if (inuse) {
1da177e4	90	atm_dev_put(inuse);
57b47a53	91	mutex_unlock(&atm_dev_mutex);
ebc37b61	92	kfree(dev);
1da177e4 LT	93	return NULL;
	94	}
	95	dev->number = number;
	96	} else {
	97	dev->number = 0;
	98	while ((inuse = __atm_dev_lookup(dev->number))) {
	99	atm_dev_put(inuse);
	100	dev->number++;
	101	}
	102	}
	103
	104	dev->ops = ops;
	105	if (flags)
	106	dev->flags = *flags;
	107	else
	108	memset(&dev->flags, 0, sizeof(dev->flags));
	109	memset(&dev->stats, 0, sizeof(dev->stats));
	110	atomic_set(&dev->refcnt, 1);
1da177e4 LT	111
1da177e4 LT	112	if (atm_proc_dev_register(dev) < 0) {
99824461	113	pr_err("atm_proc_dev_register failed for dev %s\n", type);
656d98b0 RK	114	goto out_fail;
	115	}
	116
	117	if (atm_register_sysfs(dev) < 0) {
99824461	118	pr_err("atm_register_sysfs failed for dev %s\n", type);
656d98b0 RK	119	atm_proc_dev_deregister(dev);
656d98b0 RK	120	goto out_fail;
1da177e4	121	}
656d98b0	122
aaaaaadb	123	list_add_tail(&dev->dev_list, &atm_devs);
1da177e4	124
656d98b0 RK	125	out:
656d98b0 RK	126	mutex_unlock(&atm_dev_mutex);
1da177e4	127	return dev;
656d98b0 RK	128
	129	out_fail:
	130	kfree(dev);
	131	dev = NULL;
	132	goto out;
1da177e4	133	}
07b54c9a	134	EXPORT_SYMBOL(atm_dev_register);
1da177e4 LT	135
	136	void atm_dev_deregister(struct atm_dev *dev)
	137	{
64bf69dd SG	138	BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
	139	set_bit(ATM_DF_REMOVED, &dev->flags);
	140
	141	/*
f7d57453 YH	142	* if we remove current device from atm_devs list, new device
f7d57453 YH	143	* with same number can appear, such we need deregister proc,
64bf69dd SG	144	* release async all vccs and remove them from vccs list too
64bf69dd SG	145	*/
57b47a53	146	mutex_lock(&atm_dev_mutex);
1da177e4	147	list_del(&dev->dev_list);
57b47a53	148	mutex_unlock(&atm_dev_mutex);
1da177e4	149
64bf69dd	150	atm_dev_release_vccs(dev);
656d98b0	151	atm_unregister_sysfs(dev);
64bf69dd	152	atm_proc_dev_deregister(dev);
1da177e4	153
64bf69dd	154	atm_dev_put(dev);
1da177e4	155	}
07b54c9a	156	EXPORT_SYMBOL(atm_dev_deregister);
1da177e4 LT	157
	158	static void copy_aal_stats(struct k_atm_aal_stats *from,
	159	struct atm_aal_stats *to)
	160	{
	161	#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
	162	__AAL_STAT_ITEMS
	163	#undef __HANDLE_ITEM
	164	}
	165
1da177e4 LT	166	static void subtract_aal_stats(struct k_atm_aal_stats *from,
	167	struct atm_aal_stats *to)
	168	{
	169	#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
	170	__AAL_STAT_ITEMS
	171	#undef __HANDLE_ITEM
	172	}
	173
07b54c9a JP	174	static int fetch_stats(struct atm_dev dev, struct atm_dev_stats __user arg,
07b54c9a JP	175	int zero)
1da177e4 LT	176	{
	177	struct atm_dev_stats tmp;
	178	int error = 0;
	179
	180	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
	181	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
	182	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
	183	if (arg)
	184	error = copy_to_user(arg, &tmp, sizeof(tmp));
	185	if (zero && !error) {
	186	subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
	187	subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
	188	subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
	189	}
	190	return error ? -EFAULT : 0;
	191	}
	192
8865c418	193	int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
1da177e4 LT	194	{
	195	void __user *buf;
	196	int error, len, number, size = 0;
	197	struct atm_dev *dev;
	198	struct list_head *p;
	199	int tmp_buf, tmp_p;
8865c418 DW	200	int __user *sioc_len;
	201	int __user *iobuf_len;
	202
	203	#ifndef CONFIG_COMPAT
	204	compat = 0; /* Just so the compiler _knows_ */
	205	#endif
	206
1da177e4	207	switch (cmd) {
07b54c9a JP	208	case ATM_GETNAMES:
07b54c9a JP	209	if (compat) {
8865c418	210	#ifdef CONFIG_COMPAT
07b54c9a JP	211	struct compat_atm_iobuf __user *ciobuf = arg;
	212	compat_uptr_t cbuf;
	213	iobuf_len = &ciobuf->length;
	214	if (get_user(cbuf, &ciobuf->buffer))
	215	return -EFAULT;
	216	buf = compat_ptr(cbuf);
8865c418	217	#endif
07b54c9a JP	218	} else {
	219	struct atm_iobuf __user *iobuf = arg;
	220	iobuf_len = &iobuf->length;
	221	if (get_user(buf, &iobuf->buffer))
1da177e4	222	return -EFAULT;
07b54c9a JP	223	}
	224	if (get_user(len, iobuf_len))
	225	return -EFAULT;
	226	mutex_lock(&atm_dev_mutex);
	227	list_for_each(p, &atm_devs)
	228	size += sizeof(int);
	229	if (size > len) {
57b47a53	230	mutex_unlock(&atm_dev_mutex);
07b54c9a JP	231	return -E2BIG;
	232	}
	233	tmp_buf = kmalloc(size, GFP_ATOMIC);
	234	if (!tmp_buf) {
	235	mutex_unlock(&atm_dev_mutex);
	236	return -ENOMEM;
	237	}
	238	tmp_p = tmp_buf;
	239	list_for_each(p, &atm_devs) {
	240	dev = list_entry(p, struct atm_dev, dev_list);
	241	*tmp_p++ = dev->number;
	242	}
	243	mutex_unlock(&atm_dev_mutex);
	244	error = ((copy_to_user(buf, tmp_buf, size)) \|\|
	245	put_user(size, iobuf_len))
	246	? -EFAULT : 0;
	247	kfree(tmp_buf);
	248	return error;
	249	default:
	250	break;
1da177e4 LT	251	}
1da177e4 LT	252
8865c418 DW	253	if (compat) {
	254	#ifdef CONFIG_COMPAT
	255	struct compat_atmif_sioc __user *csioc = arg;
	256	compat_uptr_t carg;
	257
	258	sioc_len = &csioc->length;
	259	if (get_user(carg, &csioc->arg))
	260	return -EFAULT;
	261	buf = compat_ptr(carg);
	262
	263	if (get_user(len, &csioc->length))
	264	return -EFAULT;
	265	if (get_user(number, &csioc->number))
	266	return -EFAULT;
	267	#endif
	268	} else {
	269	struct atmif_sioc __user *sioc = arg;
	270
	271	sioc_len = &sioc->length;
	272	if (get_user(buf, &sioc->arg))
	273	return -EFAULT;
	274	if (get_user(len, &sioc->length))
	275	return -EFAULT;
	276	if (get_user(number, &sioc->number))
	277	return -EFAULT;
	278	}
07b54c9a JP	279
	280	dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
	281	number);
	282	if (!dev)
1da177e4	283	return -ENODEV;
f7d57453	284
1da177e4	285	switch (cmd) {
07b54c9a JP	286	case ATM_GETTYPE:
	287	size = strlen(dev->type) + 1;
	288	if (copy_to_user(buf, dev->type, size)) {
	289	error = -EFAULT;
	290	goto done;
	291	}
	292	break;
	293	case ATM_GETESI:
	294	size = ESI_LEN;
	295	if (copy_to_user(buf, dev->esi, size)) {
	296	error = -EFAULT;
	297	goto done;
	298	}
	299	break;
	300	case ATM_SETESI:
	301	{
	302	int i;
	303
	304	for (i = 0; i < ESI_LEN; i++)
	305	if (dev->esi[i]) {
	306	error = -EEXIST;
1da177e4 LT	307	goto done;
1da177e4 LT	308	}
07b54c9a JP	309	}
	310	/* fall through */
	311	case ATM_SETESIF:
	312	{
	313	unsigned char esi[ESI_LEN];
	314
	315	if (!capable(CAP_NET_ADMIN)) {
	316	error = -EPERM;
	317	goto done;
	318	}
	319	if (copy_from_user(esi, buf, ESI_LEN)) {
	320	error = -EFAULT;
	321	goto done;
	322	}
	323	memcpy(dev->esi, esi, ESI_LEN);
	324	error = ESI_LEN;
	325	goto done;
	326	}
	327	case ATM_GETSTATZ:
	328	if (!capable(CAP_NET_ADMIN)) {
	329	error = -EPERM;
	330	goto done;
	331	}
	332	/* fall through */
	333	case ATM_GETSTAT:
	334	size = sizeof(struct atm_dev_stats);
	335	error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
	336	if (error)
	337	goto done;
	338	break;
	339	case ATM_GETCIRANGE:
	340	size = sizeof(struct atm_cirange);
	341	if (copy_to_user(buf, &dev->ci_range, size)) {
	342	error = -EFAULT;
	343	goto done;
	344	}
	345	break;
	346	case ATM_GETLINKRATE:
	347	size = sizeof(int);
	348	if (copy_to_user(buf, &dev->link_rate, size)) {
	349	error = -EFAULT;
	350	goto done;
	351	}
	352	break;
	353	case ATM_RSTADDR:
	354	if (!capable(CAP_NET_ADMIN)) {
	355	error = -EPERM;
	356	goto done;
	357	}
	358	atm_reset_addr(dev, ATM_ADDR_LOCAL);
	359	break;
	360	case ATM_ADDADDR:
	361	case ATM_DELADDR:
	362	case ATM_ADDLECSADDR:
	363	case ATM_DELLECSADDR:
	364	{
	365	struct sockaddr_atmsvc addr;
	366
	367	if (!capable(CAP_NET_ADMIN)) {
	368	error = -EPERM;
	369	goto done;
	370	}
	371
	372	if (copy_from_user(&addr, buf, sizeof(addr))) {
373	error = -EFAULT;
374	goto done;
375	}
376	if (cmd == ATM_ADDADDR \|\| cmd == ATM_ADDLECSADDR)
377	error = atm_add_addr(dev, &addr,
378	(cmd == ATM_ADDADDR ?
0f21ba7c	379	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
07b54c9a JP	380	else
	381	error = atm_del_addr(dev, &addr,
	382	(cmd == ATM_DELADDR ?
	383	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	384	goto done;
	385	}
	386	case ATM_GETADDR:
	387	case ATM_GETLECSADDR:
	388	error = atm_get_addr(dev, buf, len,
	389	(cmd == ATM_GETADDR ?
	390	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
	391	if (error < 0)
	392	goto done;
	393	size = error;
	394	/* may return 0, but later on size == 0 means "don't
	395	write the length" */
	396	error = put_user(size, sioc_len) ? -EFAULT : 0;
	397	goto done;
	398	case ATM_SETLOOP:
	399	if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
	400	__ATM_LM_XTLOC((int) (unsigned long) buf) >
	401	__ATM_LM_XTRMT((int) (unsigned long) buf)) {
	402	error = -EINVAL;
1da177e4	403	goto done;
07b54c9a JP	404	}
	405	/* fall through */
	406	case ATM_SETCIRANGE:
	407	case SONET_GETSTATZ:
	408	case SONET_SETDIAG:
	409	case SONET_CLRDIAG:
	410	case SONET_SETFRAMING:
	411	if (!capable(CAP_NET_ADMIN)) {
	412	error = -EPERM;
	413	goto done;
	414	}
	415	/* fall through */
	416	default:
	417	if (compat) {
	418	#ifdef CONFIG_COMPAT
	419	if (!dev->ops->compat_ioctl) {
1da177e4 LT	420	error = -EINVAL;
	421	goto done;
	422	}
07b54c9a	423	size = dev->ops->compat_ioctl(dev, cmd, buf);
8865c418	424	#endif
07b54c9a JP	425	} else {
	426	if (!dev->ops->ioctl) {
	427	error = -EINVAL;
1da177e4 LT	428	goto done;
1da177e4 LT	429	}
07b54c9a JP	430	size = dev->ops->ioctl(dev, cmd, buf);
	431	}
	432	if (size < 0) {
	433	error = (size == -ENOIOCTLCMD ? -EINVAL : size);
	434	goto done;
	435	}
1da177e4	436	}
f7d57453	437
1da177e4	438	if (size)
07b54c9a	439	error = put_user(size, sioc_len) ? -EFAULT : 0;
1da177e4 LT	440	else
	441	error = 0;
	442	done:
	443	atm_dev_put(dev);
	444	return error;
	445	}
	446
1da177e4 LT	447	void atm_dev_seq_start(struct seq_file seq, loff_t *pos)
1da177e4 LT	448	{
f7d57453	449	mutex_lock(&atm_dev_mutex);
67de7924	450	return seq_list_start_head(&atm_devs, *pos);
1da177e4 LT	451	}
	452
	453	void atm_dev_seq_stop(struct seq_file seq, void v)
	454	{
f7d57453	455	mutex_unlock(&atm_dev_mutex);
1da177e4	456	}
f7d57453	457
1da177e4 LT	458	void atm_dev_seq_next(struct seq_file seq, void v, loff_t pos)
1da177e4 LT	459	{
67de7924	460	return seq_list_next(v, &atm_devs, pos);
1da177e4	461	}