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58284a901b
linux/net/atm/resources.c
Gustavo A. R. Silva df561f6688 treewide: Use fallthrough pseudo-keyword 
Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-23 17:36:59 -05:00

421 lines
8.9 KiB
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// SPDX-License-Identifier: GPL-2.0
/* 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 <linux/slab.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, struct device *parent,
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));
refcount_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, parent) < 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_getnames(void __user *buf, int __user *iobuf_len)
{
int error, len, size = 0;
struct atm_dev *dev;
struct list_head *p;
int *tmp_buf, *tmp_p;
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;
}
int atm_dev_ioctl(unsigned int cmd, void __user *buf, int __user *sioc_len,
int number, int compat)
{
int error, len, size = 0;
struct atm_dev *dev;
if (get_user(len, sioc_len))
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;
}
}
fallthrough;
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;
}
fallthrough;
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;
}
fallthrough;
case ATM_SETCIRANGE:
case SONET_GETSTATZ:
case SONET_SETDIAG:
case SONET_CLRDIAG:
case SONET_SETFRAMING:
if (!capable(CAP_NET_ADMIN)) {
error = -EPERM;
goto done;
}
fallthrough;
default:
if (IS_ENABLED(CONFIG_COMPAT) && 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 ? -ENOTTY : 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);
}
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