[linux-2.6-block.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 */


#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;
}


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) {
		printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
		    type);
		return NULL;
	}
	mutex_lock(&atm_dev_mutex);
	if (number != -1) {
		if ((inuse = __atm_dev_lookup(number))) {
			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) {
		printk(KERN_ERR "atm_dev_register: "
		       "atm_proc_dev_register failed for dev %s\n",
		       type);
		goto out_fail;
	}

	if (atm_register_sysfs(dev) < 0) {
		printk(KERN_ERR "atm_dev_register: "
		       "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;
}


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);
}


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)
{
	void __user *buf;
	int error, len, number, size = 0;
	struct atm_dev *dev;
	struct list_head *p;
	int *tmp_buf, *tmp_p;
	struct atm_iobuf __user *iobuf = arg;
	struct atmif_sioc __user *sioc = arg;
	switch (cmd) {
		case ATM_GETNAMES:
			if (get_user(buf, &iobuf->buffer))
				return -EFAULT;
			if (get_user(len, &iobuf->length))
				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->length))
						? -EFAULT : 0;
			kfree(tmp_buf);
			return error;
		default:
			break;
	}

	if (get_user(buf, &sioc->arg))
		return -EFAULT;
	if (get_user(len, &sioc->length))
		return -EFAULT;
	if (get_user(number, &sioc->number))
		return -EFAULT;

	if (!(dev = try_then_request_module(atm_dev_lookup(number),
					    "atm-device-%d", number)))
		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:
			if (!capable(CAP_NET_ADMIN)) {
				error = -EPERM;
				goto done;
			}
			{
				struct sockaddr_atmsvc addr;

				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->length)
				? -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 (!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->length)
			? -EFAULT : 0;
	else
		error = 0;
done:
	atm_dev_put(dev);
	return error;
}

static __inline__ void *dev_get_idx(loff_t left)
{
	struct list_head *p;

	list_for_each(p, &atm_devs) {
		if (!--left)
			break;
	}
	return (p != &atm_devs) ? p : NULL;
}

void *atm_dev_seq_start(struct seq_file *seq, loff_t *pos)
{
	mutex_lock(&atm_dev_mutex);
	return *pos ? dev_get_idx(*pos) : (void *) 1;
}

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)
{
	++*pos;
	v = (v == (void *)1) ? atm_devs.next : ((struct list_head *)v)->next;
	return (v == &atm_devs) ? NULL : v;
}


EXPORT_SYMBOL(atm_dev_register);
EXPORT_SYMBOL(atm_dev_deregister);
EXPORT_SYMBOL(atm_dev_lookup);
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
	10
1da177e4 LT	11	#include <linux/ctype.h>
	12	#include <linux/string.h>
	13	#include <linux/atmdev.h>
	14	#include <linux/sonet.h>
	15	#include <linux/kernel.h> /* for barrier */
	16	#include <linux/module.h>
	17	#include <linux/bitops.h>
4fc268d2	18	#include <linux/capability.h>
1da177e4	19	#include <linux/delay.h>
57b47a53 IM	20	#include <linux/mutex.h>
57b47a53 IM	21
1da177e4 LT	22	#include <net/sock.h> /* for struct sock */
	23
	24	#include "common.h"
	25	#include "resources.h"
	26	#include "addr.h"
	27
	28
	29	LIST_HEAD(atm_devs);
57b47a53	30	DEFINE_MUTEX(atm_dev_mutex);
1da177e4 LT	31
	32	static struct atm_dev __alloc_atm_dev(const char type)
	33	{
	34	struct atm_dev *dev;
	35
0da974f4	36	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	37	if (!dev)
1da177e4 LT	38	return NULL;
1da177e4 LT	39	dev->type = type;
	40	dev->signal = ATM_PHY_SIG_UNKNOWN;
	41	dev->link_rate = ATM_OC3_PCR;
	42	spin_lock_init(&dev->lock);
	43	INIT_LIST_HEAD(&dev->local);
0f21ba7c	44	INIT_LIST_HEAD(&dev->lecs);
1da177e4 LT	45
	46	return dev;
	47	}
	48
1da177e4 LT	49	static struct atm_dev *__atm_dev_lookup(int number)
	50	{
	51	struct atm_dev *dev;
	52	struct list_head *p;
	53
	54	list_for_each(p, &atm_devs) {
	55	dev = list_entry(p, struct atm_dev, dev_list);
aaaaaadb	56	if (dev->number == number) {
1da177e4 LT	57	atm_dev_hold(dev);
	58	return dev;
	59	}
	60	}
	61	return NULL;
	62	}
	63
	64	struct atm_dev *atm_dev_lookup(int number)
	65	{
	66	struct atm_dev *dev;
	67
57b47a53	68	mutex_lock(&atm_dev_mutex);
1da177e4	69	dev = __atm_dev_lookup(number);
57b47a53	70	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	71	return dev;
	72	}
	73
64bf69dd	74
1da177e4 LT	75	struct atm_dev atm_dev_register(const char type, const struct atmdev_ops *ops,
	76	int number, unsigned long *flags)
	77	{
	78	struct atm_dev dev, inuse;
	79
	80	dev = __alloc_atm_dev(type);
	81	if (!dev) {
	82	printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
	83	type);
	84	return NULL;
	85	}
57b47a53	86	mutex_lock(&atm_dev_mutex);
1da177e4 LT	87	if (number != -1) {
	88	if ((inuse = __atm_dev_lookup(number))) {
	89	atm_dev_put(inuse);
57b47a53	90	mutex_unlock(&atm_dev_mutex);
ebc37b61	91	kfree(dev);
1da177e4 LT	92	return NULL;
	93	}
	94	dev->number = number;
	95	} else {
	96	dev->number = 0;
	97	while ((inuse = __atm_dev_lookup(dev->number))) {
	98	atm_dev_put(inuse);
	99	dev->number++;
	100	}
	101	}
	102
	103	dev->ops = ops;
	104	if (flags)
	105	dev->flags = *flags;
	106	else
	107	memset(&dev->flags, 0, sizeof(dev->flags));
	108	memset(&dev->stats, 0, sizeof(dev->stats));
	109	atomic_set(&dev->refcnt, 1);
1da177e4 LT	110
	111	if (atm_proc_dev_register(dev) < 0) {
	112	printk(KERN_ERR "atm_dev_register: "
	113	"atm_proc_dev_register failed for dev %s\n",
	114	type);
656d98b0 RK	115	goto out_fail;
	116	}
	117
	118	if (atm_register_sysfs(dev) < 0) {
	119	printk(KERN_ERR "atm_dev_register: "
	120	"atm_register_sysfs failed for dev %s\n",
	121	type);
	122	atm_proc_dev_deregister(dev);
	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 LT	136	}
	137
	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 LT	158	}
	159
	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
	169
	170	static void subtract_aal_stats(struct k_atm_aal_stats *from,
	171	struct atm_aal_stats *to)
	172	{
	173	#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
	174	__AAL_STAT_ITEMS
	175	#undef __HANDLE_ITEM
	176	}
	177
	178
	179	static int fetch_stats(struct atm_dev dev, struct atm_dev_stats __user arg, int zero)
	180	{
	181	struct atm_dev_stats tmp;
	182	int error = 0;
	183
	184	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
	185	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
	186	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
	187	if (arg)
	188	error = copy_to_user(arg, &tmp, sizeof(tmp));
	189	if (zero && !error) {
	190	subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
	191	subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
	192	subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
	193	}
	194	return error ? -EFAULT : 0;
	195	}
	196
	197
	198	int atm_dev_ioctl(unsigned int cmd, void __user *arg)
	199	{
	200	void __user *buf;
	201	int error, len, number, size = 0;
	202	struct atm_dev *dev;
	203	struct list_head *p;
	204	int tmp_buf, tmp_p;
	205	struct atm_iobuf __user *iobuf = arg;
	206	struct atmif_sioc __user *sioc = arg;
	207	switch (cmd) {
	208	case ATM_GETNAMES:
	209	if (get_user(buf, &iobuf->buffer))
	210	return -EFAULT;
	211	if (get_user(len, &iobuf->length))
	212	return -EFAULT;
57b47a53	213	mutex_lock(&atm_dev_mutex);
1da177e4 LT	214	list_for_each(p, &atm_devs)
	215	size += sizeof(int);
	216	if (size > len) {
57b47a53	217	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	218	return -E2BIG;
	219	}
	220	tmp_buf = kmalloc(size, GFP_ATOMIC);
	221	if (!tmp_buf) {
57b47a53	222	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	223	return -ENOMEM;
	224	}
	225	tmp_p = tmp_buf;
	226	list_for_each(p, &atm_devs) {
	227	dev = list_entry(p, struct atm_dev, dev_list);
	228	*tmp_p++ = dev->number;
	229	}
57b47a53	230	mutex_unlock(&atm_dev_mutex);
f7d57453	231	error = ((copy_to_user(buf, tmp_buf, size)) \|\|
1da177e4 LT	232	put_user(size, &iobuf->length))
	233	? -EFAULT : 0;
	234	kfree(tmp_buf);
	235	return error;
	236	default:
	237	break;
	238	}
	239
	240	if (get_user(buf, &sioc->arg))
	241	return -EFAULT;
	242	if (get_user(len, &sioc->length))
	243	return -EFAULT;
	244	if (get_user(number, &sioc->number))
	245	return -EFAULT;
	246
50accc9c MBJ	247	if (!(dev = try_then_request_module(atm_dev_lookup(number),
50accc9c MBJ	248	"atm-device-%d", number)))
1da177e4	249	return -ENODEV;
f7d57453	250
1da177e4 LT	251	switch (cmd) {
	252	case ATM_GETTYPE:
	253	size = strlen(dev->type) + 1;
	254	if (copy_to_user(buf, dev->type, size)) {
	255	error = -EFAULT;
	256	goto done;
	257	}
	258	break;
	259	case ATM_GETESI:
	260	size = ESI_LEN;
	261	if (copy_to_user(buf, dev->esi, size)) {
	262	error = -EFAULT;
	263	goto done;
	264	}
	265	break;
	266	case ATM_SETESI:
	267	{
	268	int i;
	269
	270	for (i = 0; i < ESI_LEN; i++)
	271	if (dev->esi[i]) {
	272	error = -EEXIST;
	273	goto done;
	274	}
	275	}
	276	/* fall through */
	277	case ATM_SETESIF:
	278	{
	279	unsigned char esi[ESI_LEN];
	280
	281	if (!capable(CAP_NET_ADMIN)) {
	282	error = -EPERM;
	283	goto done;
	284	}
	285	if (copy_from_user(esi, buf, ESI_LEN)) {
	286	error = -EFAULT;
	287	goto done;
	288	}
	289	memcpy(dev->esi, esi, ESI_LEN);
	290	error = ESI_LEN;
	291	goto done;
	292	}
	293	case ATM_GETSTATZ:
	294	if (!capable(CAP_NET_ADMIN)) {
	295	error = -EPERM;
	296	goto done;
	297	}
	298	/* fall through */
	299	case ATM_GETSTAT:
	300	size = sizeof(struct atm_dev_stats);
	301	error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
	302	if (error)
	303	goto done;
	304	break;
	305	case ATM_GETCIRANGE:
	306	size = sizeof(struct atm_cirange);
	307	if (copy_to_user(buf, &dev->ci_range, size)) {
	308	error = -EFAULT;
	309	goto done;
	310	}
	311	break;
	312	case ATM_GETLINKRATE:
	313	size = sizeof(int);
	314	if (copy_to_user(buf, &dev->link_rate, size)) {
315	error = -EFAULT;
316	goto done;
317	}
318	break;
319	case ATM_RSTADDR:
320	if (!capable(CAP_NET_ADMIN)) {
321	error = -EPERM;
322	goto done;
323	}
0f21ba7c	324	atm_reset_addr(dev, ATM_ADDR_LOCAL);
1da177e4 LT	325	break;
	326	case ATM_ADDADDR:
	327	case ATM_DELADDR:
0f21ba7c EK	328	case ATM_ADDLECSADDR:
0f21ba7c EK	329	case ATM_DELLECSADDR:
1da177e4 LT	330	if (!capable(CAP_NET_ADMIN)) {
	331	error = -EPERM;
	332	goto done;
	333	}
	334	{
	335	struct sockaddr_atmsvc addr;
	336
	337	if (copy_from_user(&addr, buf, sizeof(addr))) {
	338	error = -EFAULT;
	339	goto done;
	340	}
0f21ba7c EK	341	if (cmd == ATM_ADDADDR \|\| cmd == ATM_ADDLECSADDR)
	342	error = atm_add_addr(dev, &addr,
	343	(cmd == ATM_ADDADDR ?
	344	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
1da177e4	345	else
0f21ba7c EK	346	error = atm_del_addr(dev, &addr,
	347	(cmd == ATM_DELADDR ?
	348	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
1da177e4 LT	349	goto done;
	350	}
	351	case ATM_GETADDR:
0f21ba7c EK	352	case ATM_GETLECSADDR:
	353	error = atm_get_addr(dev, buf, len,
	354	(cmd == ATM_GETADDR ?
	355	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
1da177e4 LT	356	if (error < 0)
	357	goto done;
	358	size = error;
	359	/* may return 0, but later on size == 0 means "don't
	360	write the length" */
	361	error = put_user(size, &sioc->length)
	362	? -EFAULT : 0;
	363	goto done;
	364	case ATM_SETLOOP:
	365	if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
	366	__ATM_LM_XTLOC((int) (unsigned long) buf) >
	367	__ATM_LM_XTRMT((int) (unsigned long) buf)) {
	368	error = -EINVAL;
	369	goto done;
	370	}
	371	/* fall through */
	372	case ATM_SETCIRANGE:
	373	case SONET_GETSTATZ:
	374	case SONET_SETDIAG:
	375	case SONET_CLRDIAG:
	376	case SONET_SETFRAMING:
	377	if (!capable(CAP_NET_ADMIN)) {
	378	error = -EPERM;
	379	goto done;
	380	}
	381	/* fall through */
	382	default:
	383	if (!dev->ops->ioctl) {
	384	error = -EINVAL;
	385	goto done;
	386	}
	387	size = dev->ops->ioctl(dev, cmd, buf);
	388	if (size < 0) {
	389	error = (size == -ENOIOCTLCMD ? -EINVAL : size);
	390	goto done;
	391	}
	392	}
f7d57453	393
1da177e4 LT	394	if (size)
	395	error = put_user(size, &sioc->length)
	396	? -EFAULT : 0;
	397	else
	398	error = 0;
	399	done:
	400	atm_dev_put(dev);
	401	return error;
	402	}
	403
	404	static __inline__ void *dev_get_idx(loff_t left)
	405	{
	406	struct list_head *p;
	407
	408	list_for_each(p, &atm_devs) {
	409	if (!--left)
	410	break;
	411	}
	412	return (p != &atm_devs) ? p : NULL;
	413	}
	414
	415	void atm_dev_seq_start(struct seq_file seq, loff_t *pos)
	416	{
f7d57453	417	mutex_lock(&atm_dev_mutex);
1da177e4 LT	418	return pos ? dev_get_idx(pos) : (void *) 1;
	419	}
	420
	421	void atm_dev_seq_stop(struct seq_file seq, void v)
	422	{
f7d57453	423	mutex_unlock(&atm_dev_mutex);
1da177e4	424	}
f7d57453	425
1da177e4 LT	426	void atm_dev_seq_next(struct seq_file seq, void v, loff_t pos)
	427	{
	428	++*pos;
	429	v = (v == (void )1) ? atm_devs.next : ((struct list_head )v)->next;
	430	return (v == &atm_devs) ? NULL : v;
	431	}
	432
	433
	434	EXPORT_SYMBOL(atm_dev_register);
	435	EXPORT_SYMBOL(atm_dev_deregister);
	436	EXPORT_SYMBOL(atm_dev_lookup);