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// SPDX-License-Identifier: GPL-2.0
/* net/atm/addr.c - Local ATM address registry */
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "signaling.h"
#include "addr.h"
static int check_addr(const struct sockaddr_atmsvc *addr)
{
int i;
if (addr->sas_family != AF_ATMSVC)
return -EAFNOSUPPORT;
if (!*addr->sas_addr.pub)
return *addr->sas_addr.prv ? 0 : -EINVAL;
for (i = 1; i < ATM_E164_LEN + 1; i++) /* make sure it's \0-terminated */
if (!addr->sas_addr.pub[i])
return 0;
return -EINVAL;
}
static int identical(const struct sockaddr_atmsvc *a, const struct sockaddr_atmsvc *b)
{
if (*a->sas_addr.prv)
if (memcmp(a->sas_addr.prv, b->sas_addr.prv, ATM_ESA_LEN))
return 0;
if (!*a->sas_addr.pub)
return !*b->sas_addr.pub;
if (!*b->sas_addr.pub)
return 0;
return !strcmp(a->sas_addr.pub, b->sas_addr.pub);
}
static void notify_sigd(const struct atm_dev *dev)
{
struct sockaddr_atmpvc pvc;
pvc.sap_addr.itf = dev->number;
sigd_enq(NULL, as_itf_notify, NULL, &pvc, NULL);
}
void atm_reset_addr(struct atm_dev *dev, enum atm_addr_type_t atype)
{
unsigned long flags;
struct atm_dev_addr *this, *p;
struct list_head *head;
spin_lock_irqsave(&dev->lock, flags);
if (atype == ATM_ADDR_LECS)
head = &dev->lecs;
else
head = &dev->local;
list_for_each_entry_safe(this, p, head, entry) {
list_del(&this->entry);
kfree(this);
}
spin_unlock_irqrestore(&dev->lock, flags);
if (head == &dev->local)
notify_sigd(dev);
}
int atm_add_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
enum atm_addr_type_t atype)
{
unsigned long flags;
struct atm_dev_addr *this;
struct list_head *head;
int error;
error = check_addr(addr);
if (error)
return error;
spin_lock_irqsave(&dev->lock, flags);
if (atype == ATM_ADDR_LECS)
head = &dev->lecs;
else
head = &dev->local;
list_for_each_entry(this, head, entry) {
if (identical(&this->addr, addr)) {
spin_unlock_irqrestore(&dev->lock, flags);
return -EEXIST;
}
}
this = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);
if (!this) {
spin_unlock_irqrestore(&dev->lock, flags);
return -ENOMEM;
}
this->addr = *addr;
list_add(&this->entry, head);
spin_unlock_irqrestore(&dev->lock, flags);
if (head == &dev->local)
notify_sigd(dev);
return 0;
}
int atm_del_addr(struct atm_dev *dev, const struct sockaddr_atmsvc *addr,
enum atm_addr_type_t atype)
{
unsigned long flags;
struct atm_dev_addr *this;
struct list_head *head;
int error;
error = check_addr(addr);
if (error)
return error;
spin_lock_irqsave(&dev->lock, flags);
if (atype == ATM_ADDR_LECS)
head = &dev->lecs;
else
head = &dev->local;
list_for_each_entry(this, head, entry) {
if (identical(&this->addr, addr)) {
list_del(&this->entry);
spin_unlock_irqrestore(&dev->lock, flags);
kfree(this);
if (head == &dev->local)
notify_sigd(dev);
return 0;
}
}
spin_unlock_irqrestore(&dev->lock, flags);
return -ENOENT;
}
int atm_get_addr(struct atm_dev *dev, struct sockaddr_atmsvc __user * buf,
size_t size, enum atm_addr_type_t atype)
{
unsigned long flags;
struct atm_dev_addr *this;
struct list_head *head;
int total = 0, error;
struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;
spin_lock_irqsave(&dev->lock, flags);
if (atype == ATM_ADDR_LECS)
head = &dev->lecs;
else
head = &dev->local;
list_for_each_entry(this, head, entry)
total += sizeof(struct sockaddr_atmsvc);
tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
if (!tmp_buf) {
spin_unlock_irqrestore(&dev->lock, flags);
return -ENOMEM;
}
list_for_each_entry(this, head, entry)
memcpy(tmp_bufp++, &this->addr, sizeof(struct sockaddr_atmsvc));
spin_unlock_irqrestore(&dev->lock, flags);
error = total > size ? -E2BIG : total;
if (copy_to_user(buf, tmp_buf, total < size ? total : size))
error = -EFAULT;
kfree(tmp_buf);
return error;
}
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