Minimal nftables support to enable DNS queries on port other than :53 - #905
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l-hedgehog wants to merge 3 commits into
Open
Minimal nftables support to enable DNS queries on port other than :53#905l-hedgehog wants to merge 3 commits into
l-hedgehog wants to merge 3 commits into
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Implements a deliberately minimal, incomplete subset of the nftables netlink interface, sufficient for a single use case: redirecting outbound port 53 traffic to an alternate ip:port, to accommodate DNS servers that cannot bind to port 53.
Adds redirect (ip, port) pairs to DNSConfiguration and propagates them through the SandboxContext proto to vminitd, which installs nftables rules DNATing outbound port 53 traffic to each target. Completes the nftables subset for DNS servers that cannot bind to port 53.
So that one could test with `--init-image` w/o any update to the container.
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Implement a deliberately minimal, incomplete subset of the nftables netlink interface, sufficient for a single use case: redirecting outbound port 53 traffic to an alternate ip:port, to accommodate DNS servers that cannot bind to port 53.
Add redirect (ip, port) pairs to DNSConfiguration and propagates them through the SandboxContext proto to vminitd, which installs nftables rules DNATing outbound port 53 traffic to each target.
Fix #904