feat: use mangle table for TCP reset when Istio is present#421
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Detect Istio sidecar in the target network namespace during prepare phase and use the mangle table with PREROUTING chain instead of the filter table with INPUT chain. This ensures TCP reset rules match packets before Istio's nat DNAT rewrites the destination address.
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Summary
mangletable withPREROUTING/OUTPUT/FORWARDchains instead offiltertable withINPUT/OUTPUT/FORWARDContext
Istio's sidecar injects iptables NAT rules that redirect traffic to Envoy before the filter table is reached. The mangle table runs before NAT, so packets still have their original addresses when our REJECT rules are evaluated.
Depends on steadybit/action-kit#409
Test plan
iptables -t mangle -L