Commit df52eab2 authored by Serhey Popovych's avatar Serhey Popovych Committed by David S. Miller
Browse files

tun: Consistently configure generic netdev params via rtnetlink

Configuring generic network device parameters on tun will fail in
presence of IFLA_INFO_KIND attribute in IFLA_LINKINFO nested attribute
since tun_validate() always return failure.

This can be visualized with following ip-link(8) command sequences:

  # ip link set dev tun0 group 100
  # ip link set dev tun0 group 100 type tun
  RTNETLINK answers: Invalid argument

with contrast to dummy and veth drivers:

  # ip link set dev dummy0 group 100
  # ip link set dev dummy0 type dummy

  # ip link set dev veth0 group 100
  # ip link set dev veth0 group 100 type veth

Fix by returning zero in tun_validate() when @data is NULL that is
always in case since rtnl_link_ops->maxtype is zero in tun driver.

Fixes: f019a7a5

 ("tun: Implement ip link del tunXXX")
Signed-off-by: default avatarSerhey Popovych <>
Signed-off-by: default avatarDavid S. Miller <>
parent 921060cc
......@@ -2289,6 +2289,8 @@ 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;
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment