@@ -1164,6 +1164,21 @@ static int tun_xdp(struct net_device *dev, struct netdev_bpf *xdp)
}
}
+static int tun_net_change_carrier(struct net_device *dev, bool new_carrier)
+{
+ if (new_carrier) {
+ struct tun_struct *tun = netdev_priv(dev);
+
+ if (!tun->numqueues)
+ return -EPERM;
+
+ netif_carrier_on(dev);
+ } else {
+ netif_carrier_off(dev);
+ }
+ return 0;
+}
+
static const struct net_device_ops tun_netdev_ops = {
.ndo_uninit = tun_net_uninit,
.ndo_open = tun_net_open,
@@ -1176,6 +1191,7 @@ static const struct net_device_ops tun_netdev_ops = {
#endif
.ndo_set_rx_headroom = tun_set_headroom,
.ndo_get_stats64 = tun_net_get_stats64,
+ .ndo_change_carrier = tun_net_change_carrier,
};
static const struct net_device_ops tap_netdev_ops = {
@@ -1195,6 +1211,7 @@ static const struct net_device_ops tap_netdev_ops = {
.ndo_set_rx_headroom = tun_set_headroom,
.ndo_get_stats64 = tun_net_get_stats64,
.ndo_bpf = tun_xdp,
+ .ndo_change_carrier = tun_net_change_carrier,
};
static void tun_flow_init(struct tun_struct *tun)
@@ -2501,12 +2518,12 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
struct tun_file *tfile = file->private_data;
struct tun_struct *tun;
void __user* argp = (void __user*)arg;
+ unsigned int ifindex, carrier;
struct ifreq ifr;
kuid_t owner;
kgid_t group;
int sndbuf;
int vnet_hdr_sz;
- unsigned int ifindex;
int le;
int ret;
@@ -2771,6 +2788,14 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
ret = 0;
break;
+ case TUNSETCARRIER:
+ ret = -EFAULT;
+ if (copy_from_user(&carrier, argp, sizeof(carrier)))
+ goto unlock;
+
+ ret = tun_net_change_carrier(tun->dev, (bool)carrier);
+ break;
+
default:
ret = -EINVAL;
break;
@@ -57,6 +57,7 @@
*/
#define TUNSETVNETBE _IOW('T', 222, int)
#define TUNGETVNETBE _IOR('T', 223, int)
+#define TUNSETCARRIER _IOW('T', 226, int)
/* TUNSETIFF ifr flags */
#define IFF_TUN 0x0001