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all: make client use server-provided DERP map, add DERP region support

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Instead of hard-coding the DERP map (except for cmd/tailscale netcheck
for now), get it from the control server at runtime.

And make the DERP map support multiple nodes per region with clients
picking the first one that's available. (The server will balance the
order presented to clients for load balancing)

This deletes the stunner package, merging it into the netcheck package
instead, to minimize all the config hooks that would've been
required.

Also fix some test flakes & races.

Fixes #387 (Don't hard-code the DERP map)
Updates #388 (Add DERP region support)
Fixes #399 (wgengine: flaky tests)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2020-05-17 09:51:38 -07:00
committed by Brad Fitzpatrick
parent e8b3a5e7a1
commit e6b84f2159
20 changed files with 1439 additions and 1201 deletions
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7
wgengine/wgengine.go
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@@ -95,9 +95,10 @@ type Engine interface {
// action on.
LinkChange(isExpensive bool)
// SetDERPEnabled controls whether DERP is enabled.
// It starts enabled by default.
SetDERPEnabled(bool)
// SetDERPMap controls which (if any) DERP servers are used.
// If nil, DERP is disabled. It starts disabled until a DERP map
// is configured.
SetDERPMap(*tailcfg.DERPMap)
// SetNetInfoCallback sets the function to call when a
// new NetInfo summary is available.