[deliverable/linux.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/config.h>
#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 = kmalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return NULL;
	memset(dev, 0, sizeof(*dev));
	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);
		mutex_unlock(&atm_dev_mutex);
		kfree(dev);
		return NULL;
	}
	list_add_tail(&dev->dev_list, &atm_devs);
	mutex_unlock(&atm_dev_mutex);

	return dev;
}


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_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
	11	#include <linux/config.h>
	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
	37	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
	38	if (!dev)
	39	return NULL;
	40	memset(dev, 0, sizeof(*dev));
	41	dev->type = type;
	42	dev->signal = ATM_PHY_SIG_UNKNOWN;
	43	dev->link_rate = ATM_OC3_PCR;
	44	spin_lock_init(&dev->lock);
	45	INIT_LIST_HEAD(&dev->local);
0f21ba7c	46	INIT_LIST_HEAD(&dev->lecs);
1da177e4 LT	47
	48	return dev;
	49	}
	50
1da177e4 LT	51	static struct atm_dev *__atm_dev_lookup(int number)
	52	{
	53	struct atm_dev *dev;
	54	struct list_head *p;
	55
	56	list_for_each(p, &atm_devs) {
	57	dev = list_entry(p, struct atm_dev, dev_list);
aaaaaadb	58	if (dev->number == number) {
1da177e4 LT	59	atm_dev_hold(dev);
	60	return dev;
	61	}
	62	}
	63	return NULL;
	64	}
	65
	66	struct atm_dev *atm_dev_lookup(int number)
	67	{
	68	struct atm_dev *dev;
	69
57b47a53	70	mutex_lock(&atm_dev_mutex);
1da177e4	71	dev = __atm_dev_lookup(number);
57b47a53	72	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	73	return dev;
	74	}
	75
64bf69dd	76
1da177e4 LT	77	struct atm_dev atm_dev_register(const char type, const struct atmdev_ops *ops,
	78	int number, unsigned long *flags)
	79	{
	80	struct atm_dev dev, inuse;
	81
	82	dev = __alloc_atm_dev(type);
	83	if (!dev) {
	84	printk(KERN_ERR "atm_dev_register: no space for dev %s\n",
	85	type);
	86	return NULL;
	87	}
57b47a53	88	mutex_lock(&atm_dev_mutex);
1da177e4 LT	89	if (number != -1) {
	90	if ((inuse = __atm_dev_lookup(number))) {
	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));
	111	atomic_set(&dev->refcnt, 1);
1da177e4 LT	112
	113	if (atm_proc_dev_register(dev) < 0) {
	114	printk(KERN_ERR "atm_dev_register: "
	115	"atm_proc_dev_register failed for dev %s\n",
	116	type);
57b47a53	117	mutex_unlock(&atm_dev_mutex);
ebc37b61	118	kfree(dev);
1da177e4 LT	119	return NULL;
1da177e4 LT	120	}
aaaaaadb	121	list_add_tail(&dev->dev_list, &atm_devs);
57b47a53	122	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	123
	124	return dev;
	125	}
	126
	127
	128	void atm_dev_deregister(struct atm_dev *dev)
	129	{
64bf69dd SG	130	BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
	131	set_bit(ATM_DF_REMOVED, &dev->flags);
	132
	133	/*
	134	* if we remove current device from atm_devs list, new device
	135	* with same number can appear, such we need deregister proc,
	136	* release async all vccs and remove them from vccs list too
	137	*/
57b47a53	138	mutex_lock(&atm_dev_mutex);
1da177e4	139	list_del(&dev->dev_list);
57b47a53	140	mutex_unlock(&atm_dev_mutex);
1da177e4	141
64bf69dd SG	142	atm_dev_release_vccs(dev);
64bf69dd SG	143	atm_proc_dev_deregister(dev);
1da177e4	144
64bf69dd	145	atm_dev_put(dev);
1da177e4 LT	146	}
	147
	148
	149	static void copy_aal_stats(struct k_atm_aal_stats *from,
	150	struct atm_aal_stats *to)
	151	{
	152	#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
	153	__AAL_STAT_ITEMS
	154	#undef __HANDLE_ITEM
	155	}
	156
	157
	158	static void subtract_aal_stats(struct k_atm_aal_stats *from,
	159	struct atm_aal_stats *to)
	160	{
	161	#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
	162	__AAL_STAT_ITEMS
	163	#undef __HANDLE_ITEM
	164	}
	165
	166
	167	static int fetch_stats(struct atm_dev dev, struct atm_dev_stats __user arg, int zero)
	168	{
	169	struct atm_dev_stats tmp;
	170	int error = 0;
	171
	172	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
	173	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
	174	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
	175	if (arg)
	176	error = copy_to_user(arg, &tmp, sizeof(tmp));
	177	if (zero && !error) {
	178	subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
	179	subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
	180	subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
	181	}
	182	return error ? -EFAULT : 0;
	183	}
	184
	185
	186	int atm_dev_ioctl(unsigned int cmd, void __user *arg)
	187	{
	188	void __user *buf;
	189	int error, len, number, size = 0;
	190	struct atm_dev *dev;
	191	struct list_head *p;
	192	int tmp_buf, tmp_p;
	193	struct atm_iobuf __user *iobuf = arg;
	194	struct atmif_sioc __user *sioc = arg;
	195	switch (cmd) {
	196	case ATM_GETNAMES:
	197	if (get_user(buf, &iobuf->buffer))
	198	return -EFAULT;
	199	if (get_user(len, &iobuf->length))
	200	return -EFAULT;
57b47a53	201	mutex_lock(&atm_dev_mutex);
1da177e4 LT	202	list_for_each(p, &atm_devs)
	203	size += sizeof(int);
	204	if (size > len) {
57b47a53	205	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	206	return -E2BIG;
	207	}
	208	tmp_buf = kmalloc(size, GFP_ATOMIC);
	209	if (!tmp_buf) {
57b47a53	210	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	211	return -ENOMEM;
	212	}
	213	tmp_p = tmp_buf;
	214	list_for_each(p, &atm_devs) {
	215	dev = list_entry(p, struct atm_dev, dev_list);
	216	*tmp_p++ = dev->number;
	217	}
57b47a53	218	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	219	error = ((copy_to_user(buf, tmp_buf, size)) \|\|
	220	put_user(size, &iobuf->length))
	221	? -EFAULT : 0;
	222	kfree(tmp_buf);
	223	return error;
	224	default:
	225	break;
	226	}
	227
	228	if (get_user(buf, &sioc->arg))
	229	return -EFAULT;
	230	if (get_user(len, &sioc->length))
	231	return -EFAULT;
	232	if (get_user(number, &sioc->number))
	233	return -EFAULT;
	234
50accc9c MBJ	235	if (!(dev = try_then_request_module(atm_dev_lookup(number),
50accc9c MBJ	236	"atm-device-%d", number)))
1da177e4 LT	237	return -ENODEV;
	238
	239	switch (cmd) {
	240	case ATM_GETTYPE:
	241	size = strlen(dev->type) + 1;
	242	if (copy_to_user(buf, dev->type, size)) {
	243	error = -EFAULT;
	244	goto done;
	245	}
	246	break;
	247	case ATM_GETESI:
	248	size = ESI_LEN;
	249	if (copy_to_user(buf, dev->esi, size)) {
	250	error = -EFAULT;
	251	goto done;
	252	}
	253	break;
	254	case ATM_SETESI:
	255	{
	256	int i;
	257
	258	for (i = 0; i < ESI_LEN; i++)
	259	if (dev->esi[i]) {
	260	error = -EEXIST;
	261	goto done;
	262	}
	263	}
	264	/* fall through */
	265	case ATM_SETESIF:
	266	{
	267	unsigned char esi[ESI_LEN];
	268
	269	if (!capable(CAP_NET_ADMIN)) {
	270	error = -EPERM;
	271	goto done;
	272	}
	273	if (copy_from_user(esi, buf, ESI_LEN)) {
	274	error = -EFAULT;
	275	goto done;
	276	}
	277	memcpy(dev->esi, esi, ESI_LEN);
	278	error = ESI_LEN;
	279	goto done;
	280	}
	281	case ATM_GETSTATZ:
	282	if (!capable(CAP_NET_ADMIN)) {
	283	error = -EPERM;
	284	goto done;
	285	}
	286	/* fall through */
	287	case ATM_GETSTAT:
	288	size = sizeof(struct atm_dev_stats);
	289	error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
	290	if (error)
	291	goto done;
	292	break;
	293	case ATM_GETCIRANGE:
	294	size = sizeof(struct atm_cirange);
	295	if (copy_to_user(buf, &dev->ci_range, size)) {
	296	error = -EFAULT;
	297	goto done;
	298	}
	299	break;
	300	case ATM_GETLINKRATE:
301	size = sizeof(int);
302	if (copy_to_user(buf, &dev->link_rate, size)) {
303	error = -EFAULT;
304	goto done;
305	}
306	break;
307	case ATM_RSTADDR:
308	if (!capable(CAP_NET_ADMIN)) {
309	error = -EPERM;
310	goto done;
311	}
0f21ba7c	312	atm_reset_addr(dev, ATM_ADDR_LOCAL);
1da177e4 LT	313	break;
	314	case ATM_ADDADDR:
	315	case ATM_DELADDR:
0f21ba7c EK	316	case ATM_ADDLECSADDR:
0f21ba7c EK	317	case ATM_DELLECSADDR:
1da177e4 LT	318	if (!capable(CAP_NET_ADMIN)) {
	319	error = -EPERM;
	320	goto done;
	321	}
	322	{
	323	struct sockaddr_atmsvc addr;
	324
	325	if (copy_from_user(&addr, buf, sizeof(addr))) {
	326	error = -EFAULT;
	327	goto done;
	328	}
0f21ba7c EK	329	if (cmd == ATM_ADDADDR \|\| cmd == ATM_ADDLECSADDR)
	330	error = atm_add_addr(dev, &addr,
	331	(cmd == ATM_ADDADDR ?
	332	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
1da177e4	333	else
0f21ba7c EK	334	error = atm_del_addr(dev, &addr,
	335	(cmd == ATM_DELADDR ?
	336	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
1da177e4 LT	337	goto done;
	338	}
	339	case ATM_GETADDR:
0f21ba7c EK	340	case ATM_GETLECSADDR:
	341	error = atm_get_addr(dev, buf, len,
	342	(cmd == ATM_GETADDR ?
	343	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
1da177e4 LT	344	if (error < 0)
	345	goto done;
	346	size = error;
	347	/* may return 0, but later on size == 0 means "don't
	348	write the length" */
	349	error = put_user(size, &sioc->length)
	350	? -EFAULT : 0;
	351	goto done;
	352	case ATM_SETLOOP:
	353	if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
	354	__ATM_LM_XTLOC((int) (unsigned long) buf) >
	355	__ATM_LM_XTRMT((int) (unsigned long) buf)) {
	356	error = -EINVAL;
	357	goto done;
	358	}
	359	/* fall through */
	360	case ATM_SETCIRANGE:
	361	case SONET_GETSTATZ:
	362	case SONET_SETDIAG:
	363	case SONET_CLRDIAG:
	364	case SONET_SETFRAMING:
	365	if (!capable(CAP_NET_ADMIN)) {
	366	error = -EPERM;
	367	goto done;
	368	}
	369	/* fall through */
	370	default:
	371	if (!dev->ops->ioctl) {
	372	error = -EINVAL;
	373	goto done;
	374	}
	375	size = dev->ops->ioctl(dev, cmd, buf);
	376	if (size < 0) {
	377	error = (size == -ENOIOCTLCMD ? -EINVAL : size);
	378	goto done;
	379	}
	380	}
	381
	382	if (size)
	383	error = put_user(size, &sioc->length)
	384	? -EFAULT : 0;
	385	else
	386	error = 0;
	387	done:
	388	atm_dev_put(dev);
	389	return error;
	390	}
	391
	392	static __inline__ void *dev_get_idx(loff_t left)
	393	{
	394	struct list_head *p;
	395
	396	list_for_each(p, &atm_devs) {
	397	if (!--left)
	398	break;
	399	}
	400	return (p != &atm_devs) ? p : NULL;
	401	}
	402
	403	void atm_dev_seq_start(struct seq_file seq, loff_t *pos)
	404	{
57b47a53	405	mutex_lock(&atm_dev_mutex);
1da177e4 LT	406	return pos ? dev_get_idx(pos) : (void *) 1;
	407	}
	408
	409	void atm_dev_seq_stop(struct seq_file seq, void v)
	410	{
57b47a53	411	mutex_unlock(&atm_dev_mutex);
1da177e4 LT	412	}
	413
	414	void atm_dev_seq_next(struct seq_file seq, void v, loff_t pos)
	415	{
	416	++*pos;
	417	v = (v == (void )1) ? atm_devs.next : ((struct list_head )v)->next;
	418	return (v == &atm_devs) ? NULL : v;
	419	}
	420
	421
	422	EXPORT_SYMBOL(atm_dev_register);
	423	EXPORT_SYMBOL(atm_dev_deregister);
	424	EXPORT_SYMBOL(atm_dev_lookup);