[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 */


#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 <net/sock.h>	 /* for struct sock */

#include "common.h"
#include "resources.h"
#include "addr.h"


LIST_HEAD(atm_devs);
DECLARE_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;

	down(&atm_dev_mutex);
	dev = __atm_dev_lookup(number);
	up(&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;
	}
	down(&atm_dev_mutex);
	if (number != -1) {
		if ((inuse = __atm_dev_lookup(number))) {
			atm_dev_put(inuse);
			up(&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);
		up(&atm_dev_mutex);
		kfree(dev);
		return NULL;
	}
	list_add_tail(&dev->dev_list, &atm_devs);
	up(&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
	 */
	down(&atm_dev_mutex);
	list_del(&dev->dev_list);
	up(&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;
			down(&atm_dev_mutex);
			list_for_each(p, &atm_devs)
				size += sizeof(int);
			if (size > len) {
				up(&atm_dev_mutex);
				return -E2BIG;
			}
			tmp_buf = kmalloc(size, GFP_ATOMIC);
			if (!tmp_buf) {
				up(&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;
			}
			up(&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)
{
 	down(&atm_dev_mutex);
	return *pos ? dev_get_idx(*pos) : (void *) 1;
}

void atm_dev_seq_stop(struct seq_file *seq, void *v)
{
 	up(&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 LT	20	#include <linux/delay.h>
	21	#include <net/sock.h> /* for struct sock */
	22
	23	#include "common.h"
	24	#include "resources.h"
	25	#include "addr.h"
	26
	27
	28	LIST_HEAD(atm_devs);
aaaaaadb	29	DECLARE_MUTEX(atm_dev_mutex);
1da177e4 LT	30
	31	static struct atm_dev __alloc_atm_dev(const char type)
	32	{
	33	struct atm_dev *dev;
	34
	35	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
	36	if (!dev)
	37	return NULL;
	38	memset(dev, 0, sizeof(*dev));
	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
aaaaaadb	68	down(&atm_dev_mutex);
1da177e4	69	dev = __atm_dev_lookup(number);
aaaaaadb	70	up(&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	}
aaaaaadb	86	down(&atm_dev_mutex);
1da177e4 LT	87	if (number != -1) {
	88	if ((inuse = __atm_dev_lookup(number))) {
	89	atm_dev_put(inuse);
aaaaaadb	90	up(&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);
aaaaaadb	115	up(&atm_dev_mutex);
ebc37b61	116	kfree(dev);
1da177e4 LT	117	return NULL;
1da177e4 LT	118	}
aaaaaadb SG	119	list_add_tail(&dev->dev_list, &atm_devs);
aaaaaadb SG	120	up(&atm_dev_mutex);
1da177e4 LT	121
	122	return dev;
	123	}
	124
	125
	126	void atm_dev_deregister(struct atm_dev *dev)
	127	{
64bf69dd SG	128	BUG_ON(test_bit(ATM_DF_REMOVED, &dev->flags));
	129	set_bit(ATM_DF_REMOVED, &dev->flags);
	130
	131	/*
	132	* if we remove current device from atm_devs list, new device
	133	* with same number can appear, such we need deregister proc,
	134	* release async all vccs and remove them from vccs list too
	135	*/
aaaaaadb	136	down(&atm_dev_mutex);
1da177e4	137	list_del(&dev->dev_list);
aaaaaadb	138	up(&atm_dev_mutex);
1da177e4	139
64bf69dd SG	140	atm_dev_release_vccs(dev);
64bf69dd SG	141	atm_proc_dev_deregister(dev);
1da177e4	142
64bf69dd	143	atm_dev_put(dev);
1da177e4 LT	144	}
	145
	146
	147	static void copy_aal_stats(struct k_atm_aal_stats *from,
	148	struct atm_aal_stats *to)
	149	{
	150	#define __HANDLE_ITEM(i) to->i = atomic_read(&from->i)
	151	__AAL_STAT_ITEMS
	152	#undef __HANDLE_ITEM
	153	}
	154
	155
	156	static void subtract_aal_stats(struct k_atm_aal_stats *from,
	157	struct atm_aal_stats *to)
	158	{
	159	#define __HANDLE_ITEM(i) atomic_sub(to->i, &from->i)
	160	__AAL_STAT_ITEMS
	161	#undef __HANDLE_ITEM
	162	}
	163
	164
	165	static int fetch_stats(struct atm_dev dev, struct atm_dev_stats __user arg, int zero)
	166	{
	167	struct atm_dev_stats tmp;
	168	int error = 0;
	169
	170	copy_aal_stats(&dev->stats.aal0, &tmp.aal0);
	171	copy_aal_stats(&dev->stats.aal34, &tmp.aal34);
	172	copy_aal_stats(&dev->stats.aal5, &tmp.aal5);
	173	if (arg)
	174	error = copy_to_user(arg, &tmp, sizeof(tmp));
	175	if (zero && !error) {
	176	subtract_aal_stats(&dev->stats.aal0, &tmp.aal0);
	177	subtract_aal_stats(&dev->stats.aal34, &tmp.aal34);
	178	subtract_aal_stats(&dev->stats.aal5, &tmp.aal5);
	179	}
	180	return error ? -EFAULT : 0;
	181	}
	182
	183
	184	int atm_dev_ioctl(unsigned int cmd, void __user *arg)
	185	{
	186	void __user *buf;
	187	int error, len, number, size = 0;
	188	struct atm_dev *dev;
	189	struct list_head *p;
	190	int tmp_buf, tmp_p;
	191	struct atm_iobuf __user *iobuf = arg;
	192	struct atmif_sioc __user *sioc = arg;
	193	switch (cmd) {
	194	case ATM_GETNAMES:
	195	if (get_user(buf, &iobuf->buffer))
	196	return -EFAULT;
	197	if (get_user(len, &iobuf->length))
	198	return -EFAULT;
aaaaaadb	199	down(&atm_dev_mutex);
1da177e4 LT	200	list_for_each(p, &atm_devs)
	201	size += sizeof(int);
	202	if (size > len) {
aaaaaadb	203	up(&atm_dev_mutex);
1da177e4 LT	204	return -E2BIG;
	205	}
	206	tmp_buf = kmalloc(size, GFP_ATOMIC);
	207	if (!tmp_buf) {
aaaaaadb	208	up(&atm_dev_mutex);
1da177e4 LT	209	return -ENOMEM;
	210	}
	211	tmp_p = tmp_buf;
	212	list_for_each(p, &atm_devs) {
	213	dev = list_entry(p, struct atm_dev, dev_list);
	214	*tmp_p++ = dev->number;
	215	}
aaaaaadb	216	up(&atm_dev_mutex);
1da177e4 LT	217	error = ((copy_to_user(buf, tmp_buf, size)) \|\|
	218	put_user(size, &iobuf->length))
	219	? -EFAULT : 0;
	220	kfree(tmp_buf);
	221	return error;
	222	default:
	223	break;
	224	}
	225
	226	if (get_user(buf, &sioc->arg))
	227	return -EFAULT;
	228	if (get_user(len, &sioc->length))
	229	return -EFAULT;
	230	if (get_user(number, &sioc->number))
	231	return -EFAULT;
	232
50accc9c MBJ	233	if (!(dev = try_then_request_module(atm_dev_lookup(number),
50accc9c MBJ	234	"atm-device-%d", number)))
1da177e4 LT	235	return -ENODEV;
	236
	237	switch (cmd) {
	238	case ATM_GETTYPE:
	239	size = strlen(dev->type) + 1;
	240	if (copy_to_user(buf, dev->type, size)) {
	241	error = -EFAULT;
	242	goto done;
	243	}
	244	break;
	245	case ATM_GETESI:
	246	size = ESI_LEN;
	247	if (copy_to_user(buf, dev->esi, size)) {
	248	error = -EFAULT;
	249	goto done;
	250	}
	251	break;
	252	case ATM_SETESI:
	253	{
	254	int i;
	255
	256	for (i = 0; i < ESI_LEN; i++)
	257	if (dev->esi[i]) {
	258	error = -EEXIST;
	259	goto done;
	260	}
	261	}
	262	/* fall through */
	263	case ATM_SETESIF:
	264	{
	265	unsigned char esi[ESI_LEN];
	266
	267	if (!capable(CAP_NET_ADMIN)) {
	268	error = -EPERM;
	269	goto done;
	270	}
	271	if (copy_from_user(esi, buf, ESI_LEN)) {
	272	error = -EFAULT;
	273	goto done;
	274	}
	275	memcpy(dev->esi, esi, ESI_LEN);
	276	error = ESI_LEN;
	277	goto done;
	278	}
	279	case ATM_GETSTATZ:
	280	if (!capable(CAP_NET_ADMIN)) {
	281	error = -EPERM;
	282	goto done;
	283	}
	284	/* fall through */
	285	case ATM_GETSTAT:
	286	size = sizeof(struct atm_dev_stats);
	287	error = fetch_stats(dev, buf, cmd == ATM_GETSTATZ);
	288	if (error)
	289	goto done;
	290	break;
	291	case ATM_GETCIRANGE:
	292	size = sizeof(struct atm_cirange);
	293	if (copy_to_user(buf, &dev->ci_range, size)) {
	294	error = -EFAULT;
	295	goto done;
	296	}
	297	break;
	298	case ATM_GETLINKRATE:
299	size = sizeof(int);
300	if (copy_to_user(buf, &dev->link_rate, size)) {
301	error = -EFAULT;
302	goto done;
303	}
304	break;
305	case ATM_RSTADDR:
306	if (!capable(CAP_NET_ADMIN)) {
307	error = -EPERM;
308	goto done;
309	}
0f21ba7c	310	atm_reset_addr(dev, ATM_ADDR_LOCAL);
1da177e4 LT	311	break;
	312	case ATM_ADDADDR:
	313	case ATM_DELADDR:
0f21ba7c EK	314	case ATM_ADDLECSADDR:
0f21ba7c EK	315	case ATM_DELLECSADDR:
1da177e4 LT	316	if (!capable(CAP_NET_ADMIN)) {
	317	error = -EPERM;
	318	goto done;
	319	}
	320	{
	321	struct sockaddr_atmsvc addr;
	322
	323	if (copy_from_user(&addr, buf, sizeof(addr))) {
	324	error = -EFAULT;
	325	goto done;
	326	}
0f21ba7c EK	327	if (cmd == ATM_ADDADDR \|\| cmd == ATM_ADDLECSADDR)
	328	error = atm_add_addr(dev, &addr,
	329	(cmd == ATM_ADDADDR ?
	330	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
1da177e4	331	else
0f21ba7c EK	332	error = atm_del_addr(dev, &addr,
	333	(cmd == ATM_DELADDR ?
	334	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
1da177e4 LT	335	goto done;
	336	}
	337	case ATM_GETADDR:
0f21ba7c EK	338	case ATM_GETLECSADDR:
	339	error = atm_get_addr(dev, buf, len,
	340	(cmd == ATM_GETADDR ?
	341	ATM_ADDR_LOCAL : ATM_ADDR_LECS));
1da177e4 LT	342	if (error < 0)
	343	goto done;
	344	size = error;
	345	/* may return 0, but later on size == 0 means "don't
	346	write the length" */
	347	error = put_user(size, &sioc->length)
	348	? -EFAULT : 0;
	349	goto done;
	350	case ATM_SETLOOP:
	351	if (__ATM_LM_XTRMT((int) (unsigned long) buf) &&
	352	__ATM_LM_XTLOC((int) (unsigned long) buf) >
	353	__ATM_LM_XTRMT((int) (unsigned long) buf)) {
	354	error = -EINVAL;
	355	goto done;
	356	}
	357	/* fall through */
	358	case ATM_SETCIRANGE:
	359	case SONET_GETSTATZ:
	360	case SONET_SETDIAG:
	361	case SONET_CLRDIAG:
	362	case SONET_SETFRAMING:
	363	if (!capable(CAP_NET_ADMIN)) {
	364	error = -EPERM;
	365	goto done;
	366	}
	367	/* fall through */
	368	default:
	369	if (!dev->ops->ioctl) {
	370	error = -EINVAL;
	371	goto done;
	372	}
	373	size = dev->ops->ioctl(dev, cmd, buf);
	374	if (size < 0) {
	375	error = (size == -ENOIOCTLCMD ? -EINVAL : size);
	376	goto done;
	377	}
	378	}
	379
	380	if (size)
	381	error = put_user(size, &sioc->length)
	382	? -EFAULT : 0;
	383	else
	384	error = 0;
	385	done:
	386	atm_dev_put(dev);
	387	return error;
	388	}
	389
	390	static __inline__ void *dev_get_idx(loff_t left)
	391	{
	392	struct list_head *p;
	393
	394	list_for_each(p, &atm_devs) {
	395	if (!--left)
	396	break;
	397	}
	398	return (p != &atm_devs) ? p : NULL;
	399	}
	400
	401	void atm_dev_seq_start(struct seq_file seq, loff_t *pos)
	402	{
aaaaaadb	403	down(&atm_dev_mutex);
1da177e4 LT	404	return pos ? dev_get_idx(pos) : (void *) 1;
	405	}
	406
	407	void atm_dev_seq_stop(struct seq_file seq, void v)
	408	{
aaaaaadb	409	up(&atm_dev_mutex);
1da177e4 LT	410	}
	411
	412	void atm_dev_seq_next(struct seq_file seq, void v, loff_t pos)
	413	{
	414	++*pos;
	415	v = (v == (void )1) ? atm_devs.next : ((struct list_head )v)->next;
	416	return (v == &atm_devs) ? NULL : v;
	417	}
	418
	419
	420	EXPORT_SYMBOL(atm_dev_register);
	421	EXPORT_SYMBOL(atm_dev_deregister);
	422	EXPORT_SYMBOL(atm_dev_lookup);