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073a9a8c9e
Add two small APIs to support out-of-tree projects to exchange custom signaling messages over DERP without requiring disco protocol extensions: - OnDERPRecv callback on magicsock.Options / wgengine.Config: called for every non-disco DERP packet before the peer map lookup, allowing callers to intercept packets from unknown peers that would otherwise be dropped. - SendDERPPacketTo method on magicsock.Conn: sends arbitrary bytes to a node key via a DERP region, creating the connection if needed. Thin wrapper around the existing internal sendAddr. Also allow netstack.Start to accept a nil LocalBackend for use cases that wire up TCP/UDP handlers directly without a full LocalBackend. Updates tailscale/corp#24454 Change-Id: I99a523ef281625b8c0024a963f5f5bf5d8792c17 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>