[net,0/3] fix ipvlan/macvlan link event handing

Message

Hangbin Liu April 3, 2025, 8:58 a.m. UTC

When setting the lower-layer link up/down, the ipvlan/macvlan device
synchronizes its state via netif_stacked_transfer_operstate(), which
only checks the carrier state. However, setting the link down does not
necessarily change the carrier state for virtual interfaces like bonding.
This causes the ipvlan/macvlan state to become out of sync with the
lower-layer link state. Fix this by explicitly changing the IFF_UP flag,
similar to how VLAN handles it.

Before the patch:
  # ./rtnetlink.sh -t "kci_test_vlan kci_test_ipvlan kci_test_macvlan"
  PASS: vlan link state correct
  FAIL: ipvlan link state incorrect
  FAIL: macvlan link state incorrect

After the patch set:
  # ./rtnetlink.sh -t "kci_test_vlan kci_test_ipvlan kci_test_macvlan"
  PASS: vlan link state correct
  PASS: ipvlan link state correct
  PASS: macvlan link state correct

Hangbin Liu (3):
  ipvlan: fix NETDEV_UP/NETDEV_DOWN event handling
  macvlan: fix NETDEV_UP/NETDEV_DOWN event handling
  selftests/rtnetlink.sh: add vlan/ipvlan/macvlan link state test

 drivers/net/ipvlan/ipvlan_main.c         | 20 +++++++-
 drivers/net/macvlan.c                    | 20 ++++++++
 tools/testing/selftests/net/rtnetlink.sh | 64 ++++++++++++++++++++++++
 3 files changed, 103 insertions(+), 1 deletion(-)