fix: enable IPv6 detection on Android via UDPv6 probe - #8
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Android SELinux blocks /proc/net/*, netlink, and ifconfig lacks IPv6 on Termux, making tailscale unable to detect IPv6 on the device. This patch rewrites fix_android_netmon.go with a three-layer approach: 1. anet.Interfaces() (ioctl-based, bypasses netlink blocks) 2. ifconfig per-interface for IPv4 addresses 3. UDPv6 outbound probe to discover global IPv6 address when /proc/net/if_inet6 is unavailable This enables direct IPv6 peer-to-peer connections on Android Termux, avoiding DERP relay overhead for devices with public IPv6 connectivity.
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merged, thx |
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Problem
Android SELinux blocks
/proc/net/*and netlink on Android 11+. Termuxifconfigdoes not show IPv6 addresses. This makes tailscale unable to detect IPv6 on Android Termux devices, forcing all traffic through DERP relays even when the device has public IPv6 connectivity.Solution
Rewrites
fix_android_netmon.gowith a three-layer fallback strategy:net.Dial("udp6", "[DNS]:53")reads source address fromLocalAddr(), discovers global IPv6 address without needing any system file accessResult
v6=falseas before