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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.c52
1 files changed, 28 insertions, 24 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index a1b0697340ba..735bf41c654a 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -93,7 +93,6 @@ struct tun_file {
atomic_t count;
struct tun_struct *tun;
struct net *net;
- wait_queue_head_t read_wait;
};
struct tun_sock;
@@ -156,6 +155,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file)
tfile->tun = tun;
tun->tfile = tfile;
dev_hold(tun->dev);
+ sock_hold(tun->sk);
atomic_inc(&tfile->count);
out:
@@ -165,11 +165,8 @@ out:
static void __tun_detach(struct tun_struct *tun)
{
- struct tun_file *tfile = tun->tfile;
-
/* Detach from net device */
netif_tx_lock_bh(tun->dev);
- tfile->tun = NULL;
tun->tfile = NULL;
netif_tx_unlock_bh(tun->dev);
@@ -333,12 +330,19 @@ static void tun_net_uninit(struct net_device *dev)
/* Inform the methods they need to stop using the dev.
*/
if (tfile) {
- wake_up_all(&tfile->read_wait);
+ wake_up_all(&tun->socket.wait);
if (atomic_dec_and_test(&tfile->count))
__tun_detach(tun);
}
}
+static void tun_free_netdev(struct net_device *dev)
+{
+ struct tun_struct *tun = netdev_priv(dev);
+
+ sock_put(tun->sk);
+}
+
/* Net device open. */
static int tun_net_open(struct net_device *dev)
{
@@ -393,7 +397,7 @@ static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
/* Notify and wake up reader process */
if (tun->flags & TUN_FASYNC)
kill_fasync(&tun->fasync, SIGIO, POLL_IN);
- wake_up_interruptible(&tun->tfile->read_wait);
+ wake_up_interruptible(&tun->socket.wait);
return 0;
drop:
@@ -490,7 +494,7 @@ static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
- poll_wait(file, &tfile->read_wait, wait);
+ poll_wait(file, &tun->socket.wait, wait);
if (!skb_queue_empty(&tun->readq))
mask |= POLLIN | POLLRDNORM;
@@ -518,7 +522,7 @@ static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun,
int err;
/* Under a page? Don't bother with paged skb. */
- if (prepad + len < PAGE_SIZE)
+ if (prepad + len < PAGE_SIZE || !linear)
linear = len;
skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
@@ -565,7 +569,8 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun,
if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {
align = NET_IP_ALIGN;
- if (unlikely(len < ETH_HLEN))
+ if (unlikely(len < ETH_HLEN ||
+ (gso.hdr_len && gso.hdr_len < ETH_HLEN)))
return -EINVAL;
}
@@ -762,7 +767,7 @@ static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
goto out;
}
- add_wait_queue(&tfile->read_wait, &wait);
+ add_wait_queue(&tun->socket.wait, &wait);
while (len) {
current->state = TASK_INTERRUPTIBLE;
@@ -793,7 +798,7 @@ static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
}
current->state = TASK_RUNNING;
- remove_wait_queue(&tfile->read_wait, &wait);
+ remove_wait_queue(&tun->socket.wait, &wait);
out:
tun_put(tun);
@@ -810,7 +815,7 @@ static void tun_setup(struct net_device *dev)
tun->group = -1;
dev->ethtool_ops = &tun_ethtool_ops;
- dev->destructor = free_netdev;
+ dev->destructor = tun_free_netdev;
}
/* Trivial set of netlink ops to allow deleting tun or tap
@@ -847,7 +852,7 @@ static void tun_sock_write_space(struct sock *sk)
static void tun_sock_destruct(struct sock *sk)
{
- dev_put(container_of(sk, struct tun_sock, sk)->tun->dev);
+ free_netdev(container_of(sk, struct tun_sock, sk)->tun->dev);
}
static struct proto tun_proto = {
@@ -861,7 +866,6 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
struct sock *sk;
struct tun_struct *tun;
struct net_device *dev;
- struct tun_file *tfile = file->private_data;
int err;
dev = __dev_get_by_name(net, ifr->ifr_name);
@@ -919,13 +923,10 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
if (!sk)
goto err_free_dev;
- /* This ref count is for tun->sk. */
- dev_hold(dev);
+ init_waitqueue_head(&tun->socket.wait);
sock_init_data(&tun->socket, sk);
sk->sk_write_space = tun_sock_write_space;
- sk->sk_destruct = tun_sock_destruct;
sk->sk_sndbuf = INT_MAX;
- sk->sk_sleep = &tfile->read_wait;
tun->sk = sk;
container_of(sk, struct tun_sock, sk)->tun = tun;
@@ -941,11 +942,13 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
err = -EINVAL;
err = register_netdevice(tun->dev);
if (err < 0)
- goto err_free_dev;
+ goto err_free_sk;
+
+ sk->sk_destruct = tun_sock_destruct;
err = tun_attach(tun, file);
if (err < 0)
- goto err_free_dev;
+ goto failed;
}
DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name);
@@ -1265,7 +1268,6 @@ static int tun_chr_open(struct inode *inode, struct file * file)
atomic_set(&tfile->count, 0);
tfile->tun = NULL;
tfile->net = get_net(current->nsproxy->net_ns);
- init_waitqueue_head(&tfile->read_wait);
file->private_data = tfile;
return 0;
}
@@ -1283,14 +1285,16 @@ static int tun_chr_close(struct inode *inode, struct file *file)
__tun_detach(tun);
/* If desireable, unregister the netdevice. */
- if (!(tun->flags & TUN_PERSIST)) {
- sock_put(tun->sk);
+ if (!(tun->flags & TUN_PERSIST))
unregister_netdevice(tun->dev);
- }
rtnl_unlock();
}
+ tun = tfile->tun;
+ if (tun)
+ sock_put(tun->sk);
+
put_net(tfile->net);
kfree(tfile);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 17:01:40 +0000