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KKRainbow
c7e636f918
* fix(udp): honor exclusive bind defaults for native sockets Stop enabling SO_REUSEADDR implicitly for UDP listeners, proxy NAT sockets and port forwards. Let UdpBindOptions own the reuse request so independent receivers cannot bind the same endpoint or receive another network instance's traffic. Cover occupied IPv4/IPv6 endpoints, release and rebinding, and packet isolation across concurrent ephemeral listeners, NAT and forward sockets. The occupied-listener regression fails on the parent revision; all nine native UDP socket tests pass with the fix. * test(udp): reject duplicate WireGuard listener bindings Update the WireGuard listener test to expect AddrInUse now that native UDP sockets honor the exclusive bind default. Allocate the first port from the kernel so the test does not depend on a fixed endpoint. * test(udp): preserve dual-stack WireGuard port sharing Verify IPv6-only and IPv4 wildcard listeners can use the same port number while exact duplicate endpoints remain rejected. This preserves the dual-stack bind scenario without enabling UDP address reuse.