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Add IPv6 dispatch for OutputDNAT, fix v6 guard pattern, rename DNAT params

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- Add IPv6 router dispatch to AddOutputDNAT/RemoveOutputDNAT in both
  nftables and iptables managers (was hardcoded to v4 router only).
- Fix all DNAT and AddDNATRule dispatch methods to check Is6() first,
  then error with ErrIPv6NotInitialized if v6 components are missing.
  Previously the hasIPv6() && Is6() pattern silently fell through to
  the v4 router for v6 addresses when v6 was not initialized.
- Add ErrIPv6NotInitialized sentinel error, replace all ad-hoc
  "IPv6 not initialized" format strings across both managers.
- Rename sourcePort/targetPort to originalPort/translatedPort in all
  DNAT method signatures to reflect actual DNAT semantics.
- Remove stale "localAddr must be IPv4" comments from interface.
This commit is contained in:
Viktor Liu
2026-04-10 12:32:41 +02:00
parent 2a34f173c5
commit 2f5d9fc0cd
8 changed files with 122 additions and 78 deletions
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4
client/internal/dns/service.go
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@@ -16,8 +16,8 @@ const (
// This is used when the DNS server cannot bind port 53 directly
// and needs firewall rules to redirect traffic.
type Firewall interface {
AddOutputDNAT(localAddr netip.Addr, protocol firewall.Protocol, sourcePort, targetPort uint16) error
RemoveOutputDNAT(localAddr netip.Addr, protocol firewall.Protocol, sourcePort, targetPort uint16) error
AddOutputDNAT(localAddr netip.Addr, protocol firewall.Protocol, originalPort, translatedPort uint16) error
RemoveOutputDNAT(localAddr netip.Addr, protocol firewall.Protocol, originalPort, translatedPort uint16) error
}
type service interface {