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net/portmapper: add NAT-PMP client, move port mapping service probing

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* move probing out of netcheck into new net/portmapper package
* use PCP ANNOUNCE op codes for PCP discovery, rather than causing
  short-lived (sub-second) side effects with a 1-second-expiring map +
  delete.
* track when we heard things from the router so we can be less wasteful
  in querying the router's port mapping services in the future
* use portmapper from magicsock to map a public port

Fixes #1298
Fixes #1080
Fixes #1001
Updates #864

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-02-19 22:15:41 -08:00
committed by Brad Fitzpatrick
parent d038a5295d
commit c64bd587ae
9 changed files with 721 additions and 104 deletions
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cmd/tailscale/depaware.txt
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@@ -29,6 +29,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
tailscale.com/net/netcheck from tailscale.com/cmd/tailscale/cli
tailscale.com/net/netns from tailscale.com/derp/derphttp+
tailscale.com/net/packet from tailscale.com/wgengine/filter
tailscale.com/net/portmapper from tailscale.com/net/netcheck+
tailscale.com/net/stun from tailscale.com/net/netcheck
tailscale.com/net/tlsdial from tailscale.com/derp/derphttp
tailscale.com/net/tsaddr from tailscale.com/net/interfaces