@@ -1411,11 +1411,12 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
{
struct tun_file *tfile = file->private_data;
struct tun_struct *tun;
+ struct net_device *dev = NULL;
void __user* argp = (void __user*)arg;
struct ifreq ifr;
int ret;
- if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
+ if (cmd == TUNSETIFF || cmd == TUNATTACHQUEUE || _IOC_TYPE(cmd) == 0x89)
if (copy_from_user(&ifr, argp, ifreq_len))
return -EFAULT;
@@ -1424,7 +1425,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
* This is needed because we never checked for invalid flags on
* TUNSETIFF. */
return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE |
- IFF_VNET_HDR,
+ IFF_VNET_HDR | IFF_MULTI_QUEUE,
(unsigned int __user*)argp);
}
@@ -1440,6 +1441,8 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
return -EFAULT;
return ret;
}
+ if (cmd == TUNDETACHQUEUE)
+ return tun_detach(tfile, false);
rtnl_lock();
@@ -1447,7 +1450,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
ret = -EBADFD;
tun = rcu_dereference(tfile->tun);
- if (!tun)
+ if (!tun && cmd != TUNATTACHQUEUE)
goto unlock;
else
ret = 0;
@@ -1463,6 +1466,22 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
ret = -EFAULT;
goto out;
+ case TUNATTACHQUEUE:
+ dev = __dev_get_by_name(tfile->net, ifr.ifr_name);
+ if (!dev || (dev->netdev_ops != &tap_netdev_ops &&
+ dev->netdev_ops != &tun_netdev_ops))
+ ret = -EINVAL;
+ else if (ifr.ifr_flags &
+ ~(IFF_TAP | IFF_TUN | IFF_NO_PI | IFF_VNET_HDR)) {
+ /* ignore illegal flag */
+ ret = -EINVAL;
+ } else {
+ tun = netdev_priv(dev);
+ tfile->flags = tun->flags;
+ ret = tun_attach(tun, file);
+ }
+ break;
+
case TUNSETNOCSUM:
/* Disable/Enable checksum */
@@ -54,6 +54,9 @@
#define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)
#define TUNGETVNETHDRSZ _IOR('T', 215, int)
#define TUNSETVNETHDRSZ _IOW('T', 216, int)
+#define TUNATTACHQUEUE _IOW('T', 217, int)
+#define TUNDETACHQUEUE _IOW('T', 218, int)
+
/* TUNSETIFF ifr flags */
#define IFF_TUN 0x0001
This patch introduces two new ioctls which is used to attach and detach a socket from tuntap devices: 1) TUNATTACHQUEUE which is used to attach a socket to tuntap device. 2) TUNDETACHQUEUE which is used to detach a socket from tuntap device. It allows a socket to be detached from the device temporarily and could be re-attached again by TUNATTACHQUEUE. Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/net/tun.c | 25 ++++++++++++++++++++++--- include/linux/if_tun.h | 3 +++ 2 files changed, 25 insertions(+), 3 deletions(-)