ipvlan: Protect ipvl_port.ipvlans with mutex.

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struct ipvl_port is shared between a lower device and its upper
ipvlan devices.

All upper devices are linked to ipvl_port.ipvlans.

Once RTNL is removed, the list can be modified concurrently from
different netns due to device removal.

Let's protect it with a per-port mutex.

NETDEV_PRECHANGEUPPER and NETDEV_CHANGEUPPER are explicitly
skipped to avoid deadlock for netdev_upper_dev_unlink() called
from NETDEV_UNREGISTER.

Note that __ipvtap_dellink_ptr is added for CONFIG_IPVLAN=y
but CONFIG_TAP=m and CONFIG_IPVTAP=m.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260703001009.1572444-14-kuniyu@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

...

This commit is contained in:

Kuniyuki Iwashima 2026-07-03 00:09:24 +00:00 • committed by Paolo Abeni

parent aabbdb8c76

commit 35add1093e

3 changed files with 70 additions and 10 deletions

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8

drivers/net/ipvlan/ipvlan.h

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49

drivers/net/ipvlan/ipvlan_main.c

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23

drivers/net/ipvlan/ipvtap.c

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