mirror of https://gitee.com/openkylin/linux.git
428 lines
9.2 KiB
C
428 lines
9.2 KiB
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/delay.h>
|
|
#include <net/sock.h> /* for struct sock */
|
|
|
|
#include "common.h"
|
|
#include "resources.h"
|
|
#include "addr.h"
|
|
|
|
|
|
LIST_HEAD(atm_devs);
|
|
DEFINE_SPINLOCK(atm_dev_lock);
|
|
|
|
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);
|
|
|
|
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->ops) && (dev->number == number)) {
|
|
atm_dev_hold(dev);
|
|
return dev;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct atm_dev *atm_dev_lookup(int number)
|
|
{
|
|
struct atm_dev *dev;
|
|
|
|
spin_lock(&atm_dev_lock);
|
|
dev = __atm_dev_lookup(number);
|
|
spin_unlock(&atm_dev_lock);
|
|
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;
|
|
}
|
|
spin_lock(&atm_dev_lock);
|
|
if (number != -1) {
|
|
if ((inuse = __atm_dev_lookup(number))) {
|
|
atm_dev_put(inuse);
|
|
spin_unlock(&atm_dev_lock);
|
|
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);
|
|
list_add_tail(&dev->dev_list, &atm_devs);
|
|
spin_unlock(&atm_dev_lock);
|
|
|
|
if (atm_proc_dev_register(dev) < 0) {
|
|
printk(KERN_ERR "atm_dev_register: "
|
|
"atm_proc_dev_register failed for dev %s\n",
|
|
type);
|
|
spin_lock(&atm_dev_lock);
|
|
list_del(&dev->dev_list);
|
|
spin_unlock(&atm_dev_lock);
|
|
kfree(dev);
|
|
return NULL;
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
|
|
|
|
void atm_dev_deregister(struct atm_dev *dev)
|
|
{
|
|
unsigned long warning_time;
|
|
|
|
atm_proc_dev_deregister(dev);
|
|
|
|
spin_lock(&atm_dev_lock);
|
|
list_del(&dev->dev_list);
|
|
spin_unlock(&atm_dev_lock);
|
|
|
|
warning_time = jiffies;
|
|
while (atomic_read(&dev->refcnt) != 1) {
|
|
msleep(250);
|
|
if ((jiffies - warning_time) > 10 * HZ) {
|
|
printk(KERN_EMERG "atm_dev_deregister: waiting for "
|
|
"dev %d to become free. Usage count = %d\n",
|
|
dev->number, atomic_read(&dev->refcnt));
|
|
warning_time = jiffies;
|
|
}
|
|
}
|
|
|
|
kfree(dev);
|
|
}
|
|
|
|
void shutdown_atm_dev(struct atm_dev *dev)
|
|
{
|
|
if (atomic_read(&dev->refcnt) > 1) {
|
|
set_bit(ATM_DF_CLOSE, &dev->flags);
|
|
return;
|
|
}
|
|
if (dev->ops->dev_close)
|
|
dev->ops->dev_close(dev);
|
|
atm_dev_deregister(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;
|
|
spin_lock(&atm_dev_lock);
|
|
list_for_each(p, &atm_devs)
|
|
size += sizeof(int);
|
|
if (size > len) {
|
|
spin_unlock(&atm_dev_lock);
|
|
return -E2BIG;
|
|
}
|
|
tmp_buf = kmalloc(size, GFP_ATOMIC);
|
|
if (!tmp_buf) {
|
|
spin_unlock(&atm_dev_lock);
|
|
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;
|
|
}
|
|
spin_unlock(&atm_dev_lock);
|
|
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 = atm_dev_lookup(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);
|
|
break;
|
|
case ATM_ADDADDR:
|
|
case ATM_DELADDR:
|
|
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)
|
|
error = atm_add_addr(dev, &addr);
|
|
else
|
|
error = atm_del_addr(dev, &addr);
|
|
goto done;
|
|
}
|
|
case ATM_GETADDR:
|
|
error = atm_get_addr(dev, buf, len);
|
|
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)
|
|
{
|
|
spin_lock(&atm_dev_lock);
|
|
return *pos ? dev_get_idx(*pos) : (void *) 1;
|
|
}
|
|
|
|
void atm_dev_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
spin_unlock(&atm_dev_lock);
|
|
}
|
|
|
|
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);
|
|
EXPORT_SYMBOL(shutdown_atm_dev);
|