Fix bug where IP addresses of devices in unknown state are resolved as remote-node #17418
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borkmann
approved these changes
Sep 16, 2021
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test-me-please Job 'Cilium-PR-K8s-1.19-kernel-5.4' failed and has not been observed before, so may be related to your PR: Click to show.Test NameFailure OutputIf it is a flake, comment |
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The pull request title will be used in release-notes, so maybe could be something as follows to clarify impact for users:
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christarazi
approved these changes
Sep 16, 2021
In initExcludedIPs() we build a list of IPs that Cilium needs to exclude to operate. One check to determine if an IP should be excluded is based on the state of the net device: if the device is not up, then its IPs are excluded. Unfortunately, this check is not enough, as it's possible to have a device reporting an unknown state (because its driver is missing the operstate handling, e.g. a dummy device) while still being operational. This commit changes the logic in initExcludedIPs() to not exclude IPs of devices reporting an unknown state. Signed-off-by: Gilberto Bertin <gilberto@isovalent.com> Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
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test-me-please Job 'Cilium-PR-K8s-1.16-net-next' failed and has not been observed before, so may be related to your PR: Click to show.Test NameFailure OutputIf it is a flake, comment |
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Reviews are in. Tests are passing except for flake mentioned above. Marking ready to merge. |
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In initExcludedIPs() we build a list of IPs that Cilium needs to exclude
to operate. One check to determine if an IP should be excluded is based
on the state of the net device: if the device is not up, then its IPs
are excluded.
Unfortunately, this check is not enough, as it's possible to have a
device reporting an unknown state (because its driver is missing the
operstate handling, e.g. a dummy device) while still being operational.
This commit changes the logic in initExcludedIPs() to not exclude IPs of
devices reporting an unknown state.