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/* 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/sched.h>
#include <asm/uaccess.h>
#include "signaling.h"
#include "addr.h"
static int check_addr(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(struct sockaddr_atmsvc *a,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);
}
/*
* Avoid modification of any list of local interfaces while reading it
* (which may involve page faults and therefore rescheduling)
*/
static DECLARE_MUTEX(local_lock);
extern spinlock_t atm_dev_lock;
static void notify_sigd(struct atm_dev *dev)
{
struct sockaddr_atmpvc pvc;
pvc.sap_addr.itf = dev->number;
sigd_enq(NULL,as_itf_notify,NULL,&pvc,NULL);
}
/*
* This is called from atm_ioctl only. You must hold the lock as a caller
*/
void atm_reset_addr(struct atm_dev *dev)
{
struct atm_dev_addr *this;
down(&local_lock);
while (dev->local) {
this = dev->local;
dev->local = this->next;
kfree(this);
}
up(&local_lock);
notify_sigd(dev);
}
int atm_add_addr(struct atm_dev *dev,struct sockaddr_atmsvc *addr)
{
struct atm_dev_addr **walk;
int error;
error = check_addr(addr);
if (error) return error;
down(&local_lock);
for (walk = &dev->local; *walk; walk = &(*walk)->next)
if (identical(&(*walk)->addr,addr)) {
up(&local_lock);
return -EEXIST;
}
*walk = kmalloc(sizeof(struct atm_dev_addr),GFP_KERNEL);
if (!*walk) {
up(&local_lock);
return -ENOMEM;
}
(*walk)->addr = *addr;
(*walk)->next = NULL;
up(&local_lock);
notify_sigd(dev);
return 0;
}
int atm_del_addr(struct atm_dev *dev,struct sockaddr_atmsvc *addr)
{
struct atm_dev_addr **walk,*this;
int error;
error = check_addr(addr);
if (error) return error;
down(&local_lock);
for (walk = &dev->local; *walk; walk = &(*walk)->next)
if (identical(&(*walk)->addr,addr)) break;
if (!*walk) {
up(&local_lock);
return -ENOENT;
}
this = *walk;
*walk = this->next;
kfree(this);
up(&local_lock);
notify_sigd(dev);
return 0;
}
int atm_get_addr(struct atm_dev *dev,struct sockaddr_atmsvc *u_buf,int size)
{
struct atm_dev_addr *walk;
int total;
down(&local_lock);
total = 0;
for (walk = dev->local; walk; walk = walk->next) {
total += sizeof(struct sockaddr_atmsvc);
if (total > size) {
up(&local_lock);
return -E2BIG;
}
if (copy_to_user(u_buf,&walk->addr,
sizeof(struct sockaddr_atmsvc))) {
up(&local_lock);
return -EFAULT;
}
u_buf++;
}
up(&local_lock);
return total;
}
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