tun: forbid iface creation with rtnl ops

It's not supported right now (the goal of the initial patch was to support
'ip link del' only).

Before the patch:
$ ip link add foo type tun
[  239.632660] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[snip]
[  239.636410] RIP: 0010:register_netdevice+0x8e/0x3a0

This panic occurs because dev->netdev_ops is not set by tun_setup(). But to
have something usable, it will require more than just setting
netdev_ops.

Fixes: f019a7a594d9 ("tun: Implement ip link del tunXXX")
CC: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index e244f5d..cf349e6 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2293,9 +2293,9 @@ static void tun_setup(struct net_device *dev)
 static int tun_validate(struct nlattr *tb[], struct nlattr *data[],
                        struct netlink_ext_ack *extack)
 {
-       if (!data)
-               return 0;
-       return -EINVAL;
+       NL_SET_ERR_MSG(extack,
+                      "tun/tap creation via rtnetlink is not supported.");
+       return -EOPNOTSUPP;
 }
 
 static size_t tun_get_size(const struct net_device *dev)