Review code using go-iptables module #924
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Starting with v0.5.0, go-iptables exports a fast ChainExists() which does not rely upon listing all chains and searching the results but probes chain existence by listing its first rule. This should make a significant difference in rulesets with thousands of chains. Signed-off-by: Phil Sutter <[email protected]>
Just attempt to delete the known rules referring to the custom chain, then flush and delete it. If the latter succeeds, no referencing rules are left and the job is done. If the final flush'n'delete fails, fall back to the referencing rule search which is slow with large rulesets. Signed-off-by: Phil Sutter <[email protected]>
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Jul 21, 2023
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Patch 1 makes callers use the module-provided ChainExists() method, it is faster than the custom implementation. This does not bump dependencies, the required version of go-iptables in go.mod is already sufficient.
Patch 2 tries to speed up meta/portmap plugin's teardown() by avoiding an expensive ipt.List() call (in big rulesets). Make it fall back to the old code for unexpected cases.