wanmain.c

linux 内核源代码

/*
 *	Setup WAN link device.
 *	o verify user address space
 *	o allocate kernel memory and copy configuration data to kernel space
 *	o if configuration data includes extension, copy it to kernel space too
 *	o call driver's setup() entry point
 */

static int wanrouter_device_setup(struct wan_device *wandev,
				  wandev_conf_t __user *u_conf)
{
	void *data = NULL;
	wandev_conf_t *conf;
	int err = -EINVAL;

	if (wandev->setup == NULL) {	/* Nothing to do ? */
		printk(KERN_INFO "%s: ERROR, No setup script: wandev->setup()\n",
				wandev->name);
		return 0;
	}

	conf = kmalloc(sizeof(wandev_conf_t), GFP_KERNEL);
	if (conf == NULL){
		printk(KERN_INFO "%s: ERROR, Failed to allocate kernel memory !\n",
				wandev->name);
		return -ENOBUFS;
	}

	if (copy_from_user(conf, u_conf, sizeof(wandev_conf_t))) {
		printk(KERN_INFO "%s: Failed to copy user config data to kernel space!\n",
				wandev->name);
		kfree(conf);
		return -EFAULT;
	}

	if (conf->magic != ROUTER_MAGIC) {
		kfree(conf);
		printk(KERN_INFO "%s: ERROR, Invalid MAGIC Number\n",
				wandev->name);
		return -EINVAL;
	}

	if (conf->data_size && conf->data) {
		if (conf->data_size > 128000) {
			printk(KERN_INFO
			    "%s: ERROR, Invalid firmware data size %i !\n",
					wandev->name, conf->data_size);
			kfree(conf);
			return -EINVAL;
		}

		data = vmalloc(conf->data_size);
		if (!data) {
			printk(KERN_INFO
				"%s: ERROR, Faild allocate kernel memory !\n",
				wandev->name);
			kfree(conf);
			return -ENOBUFS;
		}
		if (!copy_from_user(data, conf->data, conf->data_size)) {
			conf->data = data;
			err = wandev->setup(wandev, conf);
		} else {
			printk(KERN_INFO
			     "%s: ERROR, Faild to copy from user data !\n",
			       wandev->name);
			err = -EFAULT;
		}
		vfree(data);
	} else {
		printk(KERN_INFO
		    "%s: ERROR, No firmware found ! Firmware size = %i !\n",
				wandev->name, conf->data_size);
	}

	kfree(conf);
	return err;
}

/*
 *	Shutdown WAN device.
 *	o delete all not opened logical channels for this device
 *	o call driver's shutdown() entry point
 */

static int wanrouter_device_shutdown(struct wan_device *wandev)
{
	struct net_device *dev;
	int err=0;

	if (wandev->state == WAN_UNCONFIGURED)
		return 0;

	printk(KERN_INFO "\n%s: Shutting Down!\n",wandev->name);

	for (dev = wandev->dev; dev;) {
		err = wanrouter_delete_interface(wandev, dev->name);
		if (err)
			return err;
		/* The above function deallocates the current dev
		 * structure. Therefore, we cannot use dev->priv
		 * as the next element: wandev->dev points to the
		 * next element */
		dev = wandev->dev;
	}

	if (wandev->ndev)
		return -EBUSY;	/* there are opened interfaces  */

	if (wandev->shutdown)
		err=wandev->shutdown(wandev);

	return err;
}

/*
 *	Get WAN device status & statistics.
 */

static int wanrouter_device_stat(struct wan_device *wandev,
				 wandev_stat_t __user *u_stat)
{
	wandev_stat_t stat;

	memset(&stat, 0, sizeof(stat));

	/* Ask device driver to update device statistics */
	if ((wandev->state != WAN_UNCONFIGURED) && wandev->update)
		wandev->update(wandev);

	/* Fill out structure */
	stat.ndev  = wandev->ndev;
	stat.state = wandev->state;

	if (copy_to_user(u_stat, &stat, sizeof(stat)))
		return -EFAULT;

	return 0;
}

/*
 *	Create new WAN interface.
 *	o verify user address space
 *	o copy configuration data to kernel address space
 *	o allocate network interface data space
 *	o call driver's new_if() entry point
 *	o make sure there is no interface name conflict
 *	o register network interface
 */

static int wanrouter_device_new_if(struct wan_device *wandev,
				   wanif_conf_t __user *u_conf)
{
	wanif_conf_t *cnf;
	struct net_device *dev = NULL;
#ifdef CONFIG_WANPIPE_MULTPPP
	struct ppp_device *pppdev=NULL;
#endif
	int err;

	if ((wandev->state == WAN_UNCONFIGURED) || (wandev->new_if == NULL))
		return -ENODEV;

	cnf = kmalloc(sizeof(wanif_conf_t), GFP_KERNEL);
	if (!cnf)
		return -ENOBUFS;

	err = -EFAULT;
	if (copy_from_user(cnf, u_conf, sizeof(wanif_conf_t)))
		goto out;

	err = -EINVAL;
	if (cnf->magic != ROUTER_MAGIC)
		goto out;

	if (cnf->config_id == WANCONFIG_MPPP) {
#ifdef CONFIG_WANPIPE_MULTPPP
		pppdev = kzalloc(sizeof(struct ppp_device), GFP_KERNEL);
		err = -ENOBUFS;
		if (pppdev == NULL)
			goto out;
		pppdev->dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
		if (pppdev->dev == NULL) {
			kfree(pppdev);
			err = -ENOBUFS;
			goto out;
		}
		err = wandev->new_if(wandev, (struct net_device *)pppdev, cnf);
		dev = pppdev->dev;
#else
		printk(KERN_INFO "%s: Wanpipe Mulit-Port PPP support has not been compiled in!\n",
				wandev->name);
		err = -EPROTONOSUPPORT;
		goto out;
#endif
	} else {
		dev = kzalloc(sizeof(struct net_device), GFP_KERNEL);
		err = -ENOBUFS;
		if (dev == NULL)
			goto out;
		err = wandev->new_if(wandev, dev, cnf);
	}

	if (!err) {
		/* Register network interface. This will invoke init()
		 * function supplied by the driver.  If device registered
		 * successfully, add it to the interface list.
		 */

		if (dev->name == NULL) {
			err = -EINVAL;
		} else {

			#ifdef WANDEBUG
			printk(KERN_INFO "%s: registering interface %s...\n",
				wanrouter_modname, dev->name);
			#endif

			err = register_netdev(dev);
			if (!err) {
				struct net_device *slave = NULL;
				unsigned long smp_flags=0;

				lock_adapter_irq(&wandev->lock, &smp_flags);

				if (wandev->dev == NULL) {
					wandev->dev = dev;
				} else {
					for (slave=wandev->dev;
					 *((struct net_device **)slave->priv);
				 slave = *((struct net_device **)slave->priv));

				     *((struct net_device **)slave->priv) = dev;
				}
				++wandev->ndev;

				unlock_adapter_irq(&wandev->lock, &smp_flags);
				err = 0;	/* done !!! */
				goto out;
			}
		}
		if (wandev->del_if)
			wandev->del_if(wandev, dev);
	}

	/* This code has moved from del_if() function */
	kfree(dev->priv);
	dev->priv = NULL;

#ifdef CONFIG_WANPIPE_MULTPPP
	if (cnf->config_id == WANCONFIG_MPPP)
		kfree(pppdev);
	else
		kfree(dev);
#else
	/* Sync PPP is disabled */
	if (cnf->config_id != WANCONFIG_MPPP)
		kfree(dev);
#endif

out:
	kfree(cnf);
	return err;
}


/*
 *	Delete WAN logical channel.
 *	 o verify user address space
 *	 o copy configuration data to kernel address space
 */

static int wanrouter_device_del_if(struct wan_device *wandev, char __user *u_name)
{
	char name[WAN_IFNAME_SZ + 1];
	int err = 0;

	if (wandev->state == WAN_UNCONFIGURED)
		return -ENODEV;

	memset(name, 0, sizeof(name));

	if (copy_from_user(name, u_name, WAN_IFNAME_SZ))
		return -EFAULT;

	err = wanrouter_delete_interface(wandev, name);
	if (err)
		return err;

	/* If last interface being deleted, shutdown card
	 * This helps with administration at leaf nodes
	 * (You can tell if the person at the other end of the phone
	 * has an interface configured) and avoids DoS vulnerabilities
	 * in binary driver files - this fixes a problem with the current
	 * Sangoma driver going into strange states when all the network
	 * interfaces are deleted and the link irrecoverably disconnected.
	 */

	if (!wandev->ndev && wandev->shutdown)
		err = wandev->shutdown(wandev);

	return err;
}

/*
 *	Miscellaneous Functions
 */

/*
 *	Find WAN device by name.
 *	Return pointer to the WAN device data space or NULL if device not found.
 */

static struct wan_device *wanrouter_find_device(char *name)
{
	struct wan_device *wandev;

	for (wandev = wanrouter_router_devlist;
	     wandev && strcmp(wandev->name, name);
		wandev = wandev->next);
	return wandev;
}

/*
 *	Delete WAN logical channel identified by its name.
 *	o find logical channel by its name
 *	o call driver's del_if() entry point
 *	o unregister network interface
 *	o unlink channel data space from linked list of channels
 *	o release channel data space
 *
 *	Return:	0		success
 *		-ENODEV		channel not found.
 *		-EBUSY		interface is open
 *
 *	Note: If (force != 0), then device will be destroyed even if interface
 *	associated with it is open. It's caller's responsibility to make
 *	sure that opened interfaces are not removed!
 */

static int wanrouter_delete_interface(struct wan_device *wandev, char *name)
{
	struct net_device *dev = NULL, *prev = NULL;
	unsigned long smp_flags=0;

	lock_adapter_irq(&wandev->lock, &smp_flags);
	dev = wandev->dev;
	prev = NULL;
	while (dev && strcmp(name, dev->name)) {
		struct net_device **slave = dev->priv;
		prev = dev;
		dev = *slave;
	}
	unlock_adapter_irq(&wandev->lock, &smp_flags);

	if (dev == NULL)
		return -ENODEV;	/* interface not found */

	if (netif_running(dev))
		return -EBUSY;	/* interface in use */

	if (wandev->del_if)
		wandev->del_if(wandev, dev);

	lock_adapter_irq(&wandev->lock, &smp_flags);
	if (prev) {
		struct net_device **prev_slave = prev->priv;
		struct net_device **slave = dev->priv;

		*prev_slave = *slave;
	} else {
		struct net_device **slave = dev->priv;
		wandev->dev = *slave;
	}
	--wandev->ndev;
	unlock_adapter_irq(&wandev->lock, &smp_flags);

	printk(KERN_INFO "%s: unregistering '%s'\n", wandev->name, dev->name);

	/* Due to new interface linking method using dev->priv,
	 * this code has moved from del_if() function.*/
	kfree(dev->priv);
	dev->priv=NULL;

	unregister_netdev(dev);

	free_netdev(dev);

	return 0;
}

static void lock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
{
	spin_lock_irqsave(lock, *smp_flags);
}


static void unlock_adapter_irq(spinlock_t *lock, unsigned long *smp_flags)
{
	spin_unlock_irqrestore(lock, *smp_flags);
}

EXPORT_SYMBOL(register_wan_device);
EXPORT_SYMBOL(unregister_wan_device);

MODULE_LICENSE("GPL");

/*
 *	End
 */