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sijie.sun
800c840bb5
Introduce shared NIC source ownership and dispatcher handling so a single dev_name can be shared by multiple tun-enabled instances while keeping per-member IP and route claims distinct. Pass Android VpnService fd registration with per-instance source and route claims. Keep the VPN address list limited to real member addresses and allow AF_INET6 without installing hidden fd00::1. Invalidate dispatcher flow and NAT state when source ownership changes or a member unregisters. Avoid rewriting non-first IPv4 fragment payloads, and adjust fragmented TCP/UDP checksums without recomputing over partial fragment bodies. Preserve source-owner routing for equal-prefix route conflicts, keep ICMP echo NAT entries distinct by echo id, and retry stale flow-owner send failures from the original packet. Only record NAT state after a translated packet is accepted by its member. Apply Linux IPv4 route preferred-source hints for shared routes and keep route repair paths source-aware. Keep Darwin ifcfg access scoped to cleanup-only paths where netns is not available.