port/builtin: support source IP propagation for UDP via IP_TRANSPARENT#577
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AkihiroSuda wants to merge 1 commit intorootless-containers:masterfrom
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port/builtin: support source IP propagation for UDP via IP_TRANSPARENT#577AkihiroSuda wants to merge 1 commit intorootless-containers:masterfrom
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The builtin port driver already preserved source IPs for TCP using IP_TRANSPARENT, but UDP was not supported. This commit extends the mechanism to UDP: - msg: extract SourceIP/SourcePort from *net.UDPAddr (not just *net.TCPAddr) - udpproxy: pass client address (from) to BackendDial callback - parent/udp: forward the client address to ConnectToChildWithRetry - child: allow dialProto=="udp" in the IP_TRANSPARENT path; use *net.UDPAddr as LocalAddr in transparentDial - testsuite: add RunUDPTransparent / TestUDPTransparent with a UDP echo server exercising the round-trip Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
AkihiroSuda
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Apr 7, 2026
| time.Sleep(500 * time.Millisecond) | ||
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| // Dial the parent port | ||
| conn, err := net.Dial("udp", fmt.Sprintf("127.0.0.1:%d", parentPort)) |
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This should test dialing non-loopback addr
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The builtin port driver already preserved source IPs for TCP using IP_TRANSPARENT, but UDP was not supported. This commit extends the mechanism to UDP:
Co-Authored-By: Claude Opus 4.6 (1M context)
Fix #576