net/atm/addr.c

/* 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);
}


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);
}


void atm_reset_addr(struct atm_dev *dev)
{
	unsigned long flags;
	struct atm_dev_addr *this;

	spin_lock_irqsave(&dev->lock, flags);
	while (dev->local) {
		this = dev->local;
		dev->local = this->next;
		kfree(this);
	}
	spin_unlock_irqrestore(&dev->lock, flags);
	notify_sigd(dev);
}


int atm_add_addr(struct atm_dev *dev,struct sockaddr_atmsvc *addr)
{
	unsigned long flags;
	struct atm_dev_addr **walk;
	int error;

	error = check_addr(addr);
	if (error)
		return error;
	spin_lock_irqsave(&dev->lock, flags);
	for (walk = &dev->local; *walk; walk = &(*walk)->next)
		if (identical(&(*walk)->addr,addr)) {
			spin_unlock_irqrestore(&dev->lock, flags);
			return -EEXIST;
		}
	*walk = kmalloc(sizeof(struct atm_dev_addr), GFP_ATOMIC);
	if (!*walk) {
		spin_unlock_irqrestore(&dev->lock, flags);
		return -ENOMEM;
	}
	(*walk)->addr = *addr;
	(*walk)->next = NULL;
	spin_unlock_irqrestore(&dev->lock, flags);
	notify_sigd(dev);
	return 0;
}


int atm_del_addr(struct atm_dev *dev,struct sockaddr_atmsvc *addr)
{
	unsigned long flags;
	struct atm_dev_addr **walk,*this;
	int error;

	error = check_addr(addr);
	if (error)
		return error;
	spin_lock_irqsave(&dev->lock, flags);
	for (walk = &dev->local; *walk; walk = &(*walk)->next)
		if (identical(&(*walk)->addr,addr)) break;
	if (!*walk) {
		spin_unlock_irqrestore(&dev->lock, flags);
		return -ENOENT;
	}
	this = *walk;
	*walk = this->next;
	kfree(this);
	spin_unlock_irqrestore(&dev->lock, flags);
	notify_sigd(dev);
	return 0;
}


int atm_get_addr(struct atm_dev *dev,struct sockaddr_atmsvc *u_buf,size_t size)
{
	unsigned long flags;
	struct atm_dev_addr *walk;
	int total = 0, error;
	struct sockaddr_atmsvc *tmp_buf, *tmp_bufp;


	spin_lock_irqsave(&dev->lock, flags);
	for (walk = dev->local; walk; walk = walk->next)
		total += sizeof(struct sockaddr_atmsvc);
	tmp_buf = tmp_bufp = kmalloc(total, GFP_ATOMIC);
	if (!tmp_buf) {
		spin_unlock_irqrestore(&dev->lock, flags);
		return -ENOMEM;
	}
	for (walk = dev->local; walk; walk = walk->next)
		memcpy(tmp_bufp++, &walk->addr, sizeof(struct sockaddr_atmsvc));
	spin_unlock_irqrestore(&dev->lock, flags);
	error = total > size ? -E2BIG : total;
	if (copy_to_user(u_buf, tmp_buf, total < size ? total : size))
		error = -EFAULT;
	kfree(tmp_buf);
	return error;
}