[PATCH 5.10 071/103] net: ip6_tunnel: Unregister catch-all devices

[Greg Kroah-Hartman]

From: Hristo Venev <hri...@venev.name>

commit 941ea91e87a6e879ed82dad4949f6234f2702bec upstream.

Similarly to the sit case, we need to remove the tunnels with no
addresses that have been moved to another network namespace.

Fixes: 0bd8762824e73 ("ip6tnl: add x-netns support")
Signed-off-by: Hristo Venev <hri...@venev.name>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv6/ip6_tunnel.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -2275,6 +2275,16 @@ static void __net_exit ip6_tnl_destroy_t
                        t = rtnl_dereference(t->next);
                }
        }
+
+       t = rtnl_dereference(ip6n->tnls_wc[0]);
+       while (t) {
+               /* If dev is in the same netns, it has already
+                * been added to the list by the previous loop.
+                */
+               if (!net_eq(dev_net(t->dev), net))
+                       unregister_netdevice_queue(t->dev, list);
+               t = rtnl_dereference(t->next);
+       }
 }
 
 static int __net_init ip6_tnl_init_net(struct net *net)