ip6_gre: Clear ign->fb_tunnel_dev in ip6gre_exit_rtnl_net().

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ip6gre_dellink() ignores itn->fb_tunnel_dev, so the per-netns
fallback tunnel device cannot be removed by userspace.

This also makes default_device_exit_batch() impossible to remove
the device since it calls ->dellink().

So, ip6gre_exit_rtnl_net() has to iterate devices in the dying
netns and call unregister_netdevice_queue() directly, and
ip6gre_tunnel_unlink() must be called at ->ndo_uninit().

For per-netns device unregistration, we want to check if the
device is being removed in ->dellink(), for which we must call
ip6gre_tunnel_unlink() before unregister_netdevice_queue().

As a prep, let's set itn->fb_tunnel_dev to NULL and remove
remove for_each_netdev_safe() in ip6gre_exit_rtnl_net().

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260916230353.367014-4-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Kuniyuki Iwashima 2026-09-16 23:02:22 +00:00 • committed by Jakub Kicinski

parent 3b2813cc6b

commit 28328796e0

1 changed files with 4 additions and 15 deletions

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net/ipv6/ip6_gre.c

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