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5a5572e48a
app connector packets We introduce the Conn25PacketHooks interface to be used as a nil-able field in userspaceEngine. The engine then plumbs through the functions to the corresponding tstun.Wrapper intercepts. The new intercepts run pre-filter when egressing toward WireGuard, and post-filter when ingressing from WireGuard. This is preserve the design invariant that the filter recognizes the traffic as interesting app connector traffic. This commit does not plumb through implementation of the interface, so should be a functional no-op. Fixes tailscale/corp#35985 Signed-off-by: Michael Ben-Ami <mzb@tailscale.com>