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path: root/drivers/net/tun.c
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Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c111
1 files changed, 80 insertions, 31 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 735bf41c654..11a0ba47b67 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -540,31 +540,38 @@ static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun,
/* Get packet from user space buffer */
static __inline__ ssize_t tun_get_user(struct tun_struct *tun,
- struct iovec *iv, size_t count,
+ const struct iovec *iv, size_t count,
int noblock)
{
struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) };
struct sk_buff *skb;
size_t len = count, align = 0;
struct virtio_net_hdr gso = { 0 };
+ int offset = 0;
if (!(tun->flags & TUN_NO_PI)) {
if ((len -= sizeof(pi)) > count)
return -EINVAL;
- if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi)))
+ if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi)))
return -EFAULT;
+ offset += sizeof(pi);
}
if (tun->flags & TUN_VNET_HDR) {
if ((len -= sizeof(gso)) > count)
return -EINVAL;
- if (memcpy_fromiovec((void *)&gso, iv, sizeof(gso)))
+ if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso)))
return -EFAULT;
+ if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
+ gso.csum_start + gso.csum_offset + 2 > gso.hdr_len)
+ gso.hdr_len = gso.csum_start + gso.csum_offset + 2;
+
if (gso.hdr_len > len)
return -EINVAL;
+ offset += sizeof(gso);
}
if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
@@ -581,7 +588,7 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun,
return PTR_ERR(skb);
}
- if (skb_copy_datagram_from_iovec(skb, 0, iv, len)) {
+ if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) {
tun->dev->stats.rx_dropped++;
kfree_skb(skb);
return -EFAULT;
@@ -673,7 +680,7 @@ static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
- result = tun_get_user(tun, (struct iovec *)iv, iov_length(iv, count),
+ result = tun_get_user(tun, iv, iov_length(iv, count),
file->f_flags & O_NONBLOCK);
tun_put(tun);
@@ -683,7 +690,7 @@ static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
/* Put packet to the user space buffer */
static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
struct sk_buff *skb,
- struct iovec *iv, int len)
+ const struct iovec *iv, int len)
{
struct tun_pi pi = { 0, skb->protocol };
ssize_t total = 0;
@@ -697,7 +704,7 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
pi.flags |= TUN_PKT_STRIP;
}
- if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi)))
+ if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi)))
return -EFAULT;
total += sizeof(pi);
}
@@ -730,14 +737,15 @@ static __inline__ ssize_t tun_put_user(struct tun_struct *tun,
gso.csum_offset = skb->csum_offset;
} /* else everything is zero */
- if (unlikely(memcpy_toiovec(iv, (void *)&gso, sizeof(gso))))
+ if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total,
+ sizeof(gso))))
return -EFAULT;
total += sizeof(gso);
}
len = min_t(int, skb->len, len);
- skb_copy_datagram_iovec(skb, 0, iv, len);
+ skb_copy_datagram_const_iovec(skb, 0, iv, total, len);
total += len;
tun->dev->stats.tx_packets++;
@@ -792,7 +800,7 @@ static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
}
netif_wake_queue(tun->dev);
- ret = tun_put_user(tun, skb, (struct iovec *) iv, len);
+ ret = tun_put_user(tun, skb, iv, len);
kfree_skb(skb);
break;
}
@@ -840,12 +848,12 @@ static void tun_sock_write_space(struct sock *sk)
if (!sock_writeable(sk))
return;
- if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
- wake_up_interruptible_sync(sk->sk_sleep);
-
if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags))
return;
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible_sync(sk->sk_sleep);
+
tun = container_of(sk, struct tun_sock, sk)->tun;
kill_fasync(&tun->fasync, SIGIO, POLL_OUT);
}
@@ -861,6 +869,52 @@ static struct proto tun_proto = {
.obj_size = sizeof(struct tun_sock),
};
+static int tun_flags(struct tun_struct *tun)
+{
+ int flags = 0;
+
+ if (tun->flags & TUN_TUN_DEV)
+ flags |= IFF_TUN;
+ else
+ flags |= IFF_TAP;
+
+ if (tun->flags & TUN_NO_PI)
+ flags |= IFF_NO_PI;
+
+ if (tun->flags & TUN_ONE_QUEUE)
+ flags |= IFF_ONE_QUEUE;
+
+ if (tun->flags & TUN_VNET_HDR)
+ flags |= IFF_VNET_HDR;
+
+ return flags;
+}
+
+static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tun_struct *tun = netdev_priv(to_net_dev(dev));
+ return sprintf(buf, "0x%x\n", tun_flags(tun));
+}
+
+static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tun_struct *tun = netdev_priv(to_net_dev(dev));
+ return sprintf(buf, "%d\n", tun->owner);
+}
+
+static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tun_struct *tun = netdev_priv(to_net_dev(dev));
+ return sprintf(buf, "%d\n", tun->group);
+}
+
+static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL);
+static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL);
+static DEVICE_ATTR(group, 0444, tun_show_group, NULL);
+
static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
{
struct sock *sk;
@@ -870,6 +924,8 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
dev = __dev_get_by_name(net, ifr->ifr_name);
if (dev) {
+ if (ifr->ifr_flags & IFF_TUN_EXCL)
+ return -EBUSY;
if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops)
tun = netdev_priv(dev);
else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops)
@@ -944,6 +1000,11 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
if (err < 0)
goto err_free_sk;
+ if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
+ device_create_file(&tun->dev->dev, &dev_attr_owner) ||
+ device_create_file(&tun->dev->dev, &dev_attr_group))
+ printk(KERN_ERR "Failed to create tun sysfs files\n");
+
sk->sk_destruct = tun_sock_destruct;
err = tun_attach(tun, file);
@@ -996,21 +1057,7 @@ static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr)
strcpy(ifr->ifr_name, tun->dev->name);
- ifr->ifr_flags = 0;
-
- if (ifr->ifr_flags & TUN_TUN_DEV)
- ifr->ifr_flags |= IFF_TUN;
- else
- ifr->ifr_flags |= IFF_TAP;
-
- if (tun->flags & TUN_NO_PI)
- ifr->ifr_flags |= IFF_NO_PI;
-
- if (tun->flags & TUN_ONE_QUEUE)
- ifr->ifr_flags |= IFF_ONE_QUEUE;
-
- if (tun->flags & TUN_VNET_HDR)
- ifr->ifr_flags |= IFF_VNET_HDR;
+ ifr->ifr_flags = tun_flags(tun);
tun_put(tun);
return 0;
@@ -1275,21 +1322,22 @@ static int tun_chr_open(struct inode *inode, struct file * file)
static int tun_chr_close(struct inode *inode, struct file *file)
{
struct tun_file *tfile = file->private_data;
- struct tun_struct *tun = __tun_get(tfile);
+ struct tun_struct *tun;
+ rtnl_lock();
+ tun = __tun_get(tfile);
if (tun) {
DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name);
- rtnl_lock();
__tun_detach(tun);
/* If desireable, unregister the netdevice. */
if (!(tun->flags & TUN_PERSIST))
unregister_netdevice(tun->dev);
- rtnl_unlock();
}
+ rtnl_unlock();
tun = tfile->tun;
if (tun)
@@ -1318,6 +1366,7 @@ static const struct file_operations tun_fops = {
static struct miscdevice tun_miscdev = {
.minor = TUN_MINOR,
.name = "tun",
+ .devnode = "net/tun",
.fops = &tun_fops,
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-16 20:07:57 +0000