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[client] Redirect dns forwarder port 5353 to new listening port 22054 (#4707)

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- Port dnat changes from https://github.com/netbirdio/netbird/pull/4015 (nftables/iptables/userspace)
  - For userspace: rewrite the original port to the target port
  - Remember original destination port in conntrack
  - Rewrite the source port back to the original port for replies
- Redirect incoming port 5353 to 22054 (tcp/udp)
- Revert port changes based on the network map received from management
- Adjust tracer to show NAT stages
This commit is contained in:
Viktor Liu
2025-10-28 15:12:53 +01:00
committed by GitHub
parent 4545ab9a52
commit 404cab90ba
25 changed files with 1125 additions and 196 deletions
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4
dns/dns.go
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@@ -19,6 +19,10 @@ const (
RootZone = "."
// DefaultClass is the class supported by the system
DefaultClass = "IN"
// ForwarderClientPort is the port clients connect to. DNAT rewrites packets from ForwarderClientPort to ForwarderServerPort.
ForwarderClientPort uint16 = 5353
// ForwarderServerPort is the port the DNS forwarder actually listens on. Packets to ForwarderClientPort are DNATed here.
ForwarderServerPort uint16 = 22054
)
const invalidHostLabel = "[^a-zA-Z0-9-]+"