ipv6: give an IPv6 dev to blackhole_netdev

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IPv6 addrconf notifiers wants the loopback device to
be the last device being dismantled at netns deletion.

This caused many limitations and work arounds.

Back in linux-5.3, Mahesh added a per host blackhole_netdev
that can be used whenever we need to make sure objects no longer
refer to a disappearing device.

If we attach to blackhole_netdev an ip6_ptr (allocate an idev),
then we can use this special device (which is never freed)
in place of the loopback_dev (which can be freed).

This will permit improvements in netdev_run_todo() and other parts
of the stack where had steps to make sure loopback_dev was
the last device to disappear.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2022-02-10 13:42:29 -08:00 • committed by David S. Miller

parent 2d4feb2c1b

commit e5f80fcf86

2 changed files with 40 additions and 59 deletions

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78

net/ipv6/addrconf.c

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21

net/ipv6/route.c

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