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tailnet/go.sum
NeoMody 08679fb345 Implement complete Tailscale protocol stack: control, DERP, WireGuard, disco NAT traversal 
Clean-room implementation of the Tailscale protocol without tsnet/wgengine/netmon
dependencies, enabling cross-platform support including Android (no NetlinkRIB).

Control plane (control.go):
- Noise IK handshake (ts2021) over HTTP/2
- Register, MapLite (non-streaming), MapPoll (streaming)
- SendEndpointUpdate (Stream=false, OmitPeers=true) — the only way to
  push node state to control (streaming MapPoll is read-only for v>=68)

Data plane (magicbind.go, derpclient.go):
- conn.Bind implementation multiplexing direct UDP and DERP relay
- DERP client with per-region connections and recv multiplexing
- Close/CloseAll split to survive WireGuard IpcSet rebind cycle

NAT traversal (disco.go):
- STUN endpoint discovery via tailscale.com/net/stun (zero deps)
- CallMeMaybe/Ping/Pong over DERP for hole punching
- Direct UDP path establishment with latency tracking
- Keepalive re-ping loop (30s) to maintain direct paths
- UDP data forwarding from disco socket to MagicBind recv path

DERP region selection (derpclient.go):
- Parallel HTTPS latency probing of all DERP regions
- Lowest-latency region selected as home DERP

Orchestration (outbound.go):
- Register → MapLite → ProbeRegions → ConnectDERP → SendEndpointUpdate
  → MapPoll → WireGuard+netstack → Disco+STUN → keepalive
- DialContext/ListenPacket/Peers/LookupTailscale API

Verified: DERP relay 500ms+ → direct UDP 13ms after disco NAT traversal.
2026-04-02 11:48:15 +08:00

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