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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>