ip6_gre: don't allow to remove the fb_tunnel_dev
authorNicolas Dichtel <nicolas.dichtel@6wind.com>
Mon, 14 Apr 2014 15:11:38 +0000 (17:11 +0200)
committerDavid S. Miller <davem@davemloft.net>
Tue, 15 Apr 2014 18:56:19 +0000 (14:56 -0400)
commit54d63f787b652755e66eb4dd8892ee6d3f5197fc
tree91c9366f2882b7c178633efab41cecc25013bf12
parentaad88724c9d54acb1a9737cb6069d8470fa85f74
ip6_gre: don't allow to remove the fb_tunnel_dev

It's possible to remove the FB tunnel with the command 'ip link del ip6gre0' but
this is unsafe, the module always supposes that this device exists. For example,
ip6gre_tunnel_lookup() may use it unconditionally.

Let's add a rtnl handler for dellink, which will never remove the FB tunnel (we
let ip6gre_destroy_tunnels() do the job).

Introduced by commit c12b395a4664 ("gre: Support GRE over IPv6").

CC: Dmitry Kozlov <xeb@mail.ru>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv6/ip6_gre.c