/*
* Changes:
*
+ * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14
+ * Add TUNSETLINK ioctl to set the link encapsulation
+ *
* Mark Smith <markzzzsmith@yahoo.com.au>
* Use random_ether_addr() for tap MAC address.
*
#define DRV_DESCRIPTION "Universal TUN/TAP device driver"
#define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>"
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
/* Network device part of the driver */
static LIST_HEAD(tun_dev_list);
-static struct ethtool_ops tun_ethtool_ops;
+static const struct ethtool_ops tun_ethtool_ops;
/* Net device open. */
static int tun_net_open(struct net_device *dev)
static void tun_net_init(struct net_device *dev)
{
struct tun_struct *tun = netdev_priv(dev);
-
+
switch (tun->flags & TUN_TYPE_MASK) {
case TUN_TUN_DEV:
/* Point-to-Point TUN Device */
dev->mtu = 1500;
/* Zero header length */
- dev->type = ARPHRD_NONE;
+ dev->type = ARPHRD_NONE;
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */
break;
/* Poll */
static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
-{
+{
struct tun_struct *tun = file->private_data;
unsigned int mask = POLLOUT | POLLWRNORM;
DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
poll_wait(file, &tun->read_wait, wait);
-
- if (skb_queue_len(&tun->readq))
+
+ if (!skb_queue_empty(&tun->readq))
mask |= POLLIN | POLLRDNORM;
return mask;
{
struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) };
struct sk_buff *skb;
- size_t len = count;
+ size_t len = count, align = 0;
if (!(tun->flags & TUN_NO_PI)) {
if ((len -= sizeof(pi)) > count)
if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
return -EFAULT;
}
-
- if (!(skb = alloc_skb(len + 2, GFP_KERNEL))) {
+
+ if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV)
+ align = NET_IP_ALIGN;
+
+ if (!(skb = alloc_skb(len + align, GFP_KERNEL))) {
tun->stats.rx_dropped++;
return -ENOMEM;
}
- skb_reserve(skb, 2);
- if (memcpy_fromiovec(skb_put(skb, len), iv, len))
+ if (align)
+ skb_reserve(skb, align);
+ if (memcpy_fromiovec(skb_put(skb, len), iv, len)) {
+ tun->stats.rx_dropped++;
+ kfree_skb(skb);
return -EFAULT;
+ }
skb->dev = tun->dev;
switch (tun->flags & TUN_TYPE_MASK) {
if (tun->flags & TUN_NOCHECKSUM)
skb->ip_summed = CHECKSUM_UNNECESSARY;
-
+
netif_rx_ni(skb);
tun->dev->last_rx = jiffies;
-
+
tun->stats.rx_packets++;
tun->stats.rx_bytes += len;
return count;
-}
+}
static inline size_t iov_total(const struct iovec *iv, unsigned long count)
{
unsigned long i;
size_t len;
- for (i = 0, len = 0; i < count; i++)
+ for (i = 0, len = 0; i < count; i++)
len += iv[i].iov_len;
return len;
}
-/* Writev */
-static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv,
- unsigned long count, loff_t *pos)
+static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
+ unsigned long count, loff_t pos)
{
- struct tun_struct *tun = file->private_data;
+ struct tun_struct *tun = iocb->ki_filp->private_data;
if (!tun)
return -EBADFD;
return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count));
}
-/* Write */
-static ssize_t tun_chr_write(struct file * file, const char __user * buf,
- size_t count, loff_t *pos)
-{
- struct iovec iv = { (void __user *) buf, count };
- return tun_chr_writev(file, &iv, 1, pos);
-}
-
/* Put packet to the user space buffer */
static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
struct sk_buff *skb,
/* Packet will be striped */
pi.flags |= TUN_PKT_STRIP;
}
-
+
if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
return -EFAULT;
total += sizeof(pi);
- }
+ }
len = min_t(int, skb->len, len);
return total;
}
-/* Readv */
-static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv,
- unsigned long count, loff_t *pos)
+static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
+ unsigned long count, loff_t pos)
{
+ struct file *file = iocb->ki_filp;
struct tun_struct *tun = file->private_data;
DECLARE_WAITQUEUE(wait, current);
struct sk_buff *skb;
return ret;
}
-/* Read */
-static ssize_t tun_chr_read(struct file * file, char __user * buf,
- size_t count, loff_t *pos)
-{
- struct iovec iv = { buf, count };
- return tun_chr_readv(file, &iv, 1, pos);
-}
-
static void tun_setup(struct net_device *dev)
{
struct tun_struct *tun = netdev_priv(dev);
if (tun->owner != -1 &&
current->euid != tun->owner && !capable(CAP_NET_ADMIN))
return -EPERM;
- }
- else if (__dev_get_by_name(ifr->ifr_name))
+ }
+ else if (__dev_get_by_name(ifr->ifr_name))
return -EINVAL;
else {
char *name;
err = -EINVAL;
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
/* Set dev type */
if (ifr->ifr_flags & IFF_TUN) {
/* TUN device */
/* TAP device */
flags |= TUN_TAP_DEV;
name = "tap%d";
- } else
+ } else
goto failed;
-
+
if (*ifr->ifr_name)
name = ifr->ifr_name;
err = register_netdevice(tun->dev);
if (err < 0)
goto err_free_dev;
-
+
list_add(&tun->list, &tun_dev_list);
}
return err;
}
-static int tun_chr_ioctl(struct inode *inode, struct file *file,
+static int tun_chr_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct tun_struct *tun = file->private_data;
DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner);
break;
+ case TUNSETLINK:
+ /* Only allow setting the type when the interface is down */
+ if (tun->dev->flags & IFF_UP) {
+ DBG(KERN_INFO "%s: Linktype set failed because interface is up\n",
+ tun->dev->name);
+ return -EBUSY;
+ } else {
+ tun->dev->type = (int) arg;
+ DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type);
+ }
+ break;
+
#ifdef TUN_DEBUG
case TUNSETDEBUG:
tun->debug = arg;
DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on);
if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0)
- return ret;
-
+ return ret;
+
if (on) {
- ret = f_setown(file, current->pid, 0);
+ ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0);
if (ret)
return ret;
tun->flags |= TUN_FASYNC;
- } else
+ } else
tun->flags &= ~TUN_FASYNC;
return 0;
}
static struct file_operations tun_fops = {
- .owner = THIS_MODULE,
+ .owner = THIS_MODULE,
.llseek = no_llseek,
- .read = tun_chr_read,
- .readv = tun_chr_readv,
- .write = tun_chr_write,
- .writev = tun_chr_writev,
+ .read = do_sync_read,
+ .aio_read = tun_chr_aio_read,
+ .write = do_sync_write,
+ .aio_write = tun_chr_aio_write,
.poll = tun_chr_poll,
.ioctl = tun_chr_ioctl,
.open = tun_chr_open,
.release = tun_chr_close,
- .fasync = tun_chr_fasync
+ .fasync = tun_chr_fasync
};
static struct miscdevice tun_miscdev = {
.minor = TUN_MINOR,
.name = "tun",
.fops = &tun_fops,
- .devfs_name = "net/tun",
};
/* ethtool interface */
return 0;
}
-static struct ethtool_ops tun_ethtool_ops = {
+static const struct ethtool_ops tun_ethtool_ops = {
.get_settings = tun_get_settings,
.get_drvinfo = tun_get_drvinfo,
.get_msglevel = tun_get_msglevel,
.set_rx_csum = tun_set_rx_csum
};
-int __init tun_init(void)
+static int __init tun_init(void)
{
int ret = 0;
return ret;
}
-void tun_cleanup(void)
+static void tun_cleanup(void)
{
struct tun_struct *tun, *nxt;
- misc_deregister(&tun_miscdev);
+ misc_deregister(&tun_miscdev);
rtnl_lock();
list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) {
unregister_netdevice(tun->dev);
}
rtnl_unlock();
-
+
}
module_init(tun_init);
git://git.onelab.eu / linux-2.6.git / blobdiff