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tun: implement carrier change 

The userspace may need to control the carrier state.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Didier Pallard <didier.pallard@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel 2018-11-28 19:12:56 +01:00 committed by David S. Miller
parent bf1c3ab8d3
commit 26d31925cd
2 changed files with 27 additions and 1 deletions
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27
drivers/net/tun.c
View File

@ -1254,6 +1254,21 @@ 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,
@ -1263,6 +1278,7 @@ static const struct net_device_ops tun_netdev_ops = {
.ndo_select_queue = tun_select_queue,
.ndo_set_rx_headroom = tun_set_headroom,
.ndo_get_stats64 = tun_net_get_stats64,
.ndo_change_carrier = tun_net_change_carrier,
};
static void __tun_xdp_flush_tfile(struct tun_file *tfile)
@ -1345,6 +1361,7 @@ static const struct net_device_ops tap_netdev_ops = {
.ndo_get_stats64 = tun_net_get_stats64,
.ndo_bpf = tun_xdp,
.ndo_xdp_xmit = tun_xdp_xmit,
.ndo_change_carrier = tun_net_change_carrier,
};
static void tun_flow_init(struct tun_struct *tun)
@ -3002,12 +3019,12 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
struct net *net = sock_net(&tfile->sk);
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;
bool do_notify = false;
@ -3291,6 +3308,14 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
ret = tun_set_ebpf(tun, &tun->filter_prog, argp);
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;

1
include/uapi/linux/if_tun.h
View File

@ -59,6 +59,7 @@
#define TUNGETVNETBE _IOR('T', 223, int)
#define TUNSETSTEERINGEBPF _IOR('T', 224, int)
#define TUNSETFILTEREBPF _IOR('T', 225, int)
#define TUNSETCARRIER _IOW('T', 226, int)
/* TUNSETIFF ifr flags */
#define IFF_TUN 0x0001