Refactor netns handling, fix flakes, namespace some tests #227
Commits on May 14, 2024
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netns: remove iproute2 dependency
This commit introduces a breaking change to rtnetlink.NetNS. The existing netns implementation had a few problems. It assumed that network namespaces have names, that they would always be pinned to /var/run/netns, and that numeric/integer references are pid references. This made the NetNS type unusable for referring to existing netns by fd, such as ones created by other libraries, or by opening procfs entries directly as demonstrated in the new testutils.NetNS() function. The forced dependency on the `ip` CLI tool also wasn't reasonable for a pure-Go library. Using the old implementation in a scratch/distroless container would quickly run into roadblocks. This commit also removes the functionality of creating and pinning new netns. There are plenty of options out in the Go ecosystem for that, and providing your own is only a few lines of code. Signed-off-by: Timo Beckers <[email protected]>
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test: remove calls to unix.Setrlimit() in favor of rlimit.RemoveMemlo…
…ck() ebpf-go provides this out of the box and skips setting the rlimit on kernels that support bpf memory cgroup accounting. Signed-off-by: Timo Beckers <[email protected]>
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neigh: fix flaky tests, add State field to Neigh entry
The flaky tests that were documented in the code are expected. Use the State field to discard entries that can't reasonably be considered in tests. Signed-off-by: Timo Beckers <[email protected]>
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neigh: fix race in Conn.Neighbours
When running tests locally, I would frequently hit "too many/little matches, expected 1, actual 0" due to other tests creating and deleting interfaces in the common host netns used by all tests. Neigh entries that fail the interface lookup can't have their Interface fields populated and should be dropped from the result since the interface is no longer there to begin with. Signed-off-by: Timo Beckers <[email protected]>
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xdp: refactor test suite to use test helpers and netns-driven tests
While running the test suite for testing netns-related changes, I noticed some of the xdp tests started failing because they wanted to create a dummy interface in the host network namespace. Avoid the complexity of managing dummy interfaces altogether by running all tests within their own netns and use the existing lo device that's present by default. Signed-off-by: Timo Beckers <[email protected]>
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xdp,netkit: remove duplicate kernelMinReq in favor of testutils.SkipO…
…nOldKernel There were two implementations of this, so move them to common testutils. Signed-off-by: Timo Beckers <[email protected]>
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