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wgengine/magicsock, derp, derp/derphttp: respond to DERP server->client pings

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No server support yet, but we want Tailscale 1.6 clients to be able to respond
to them when the server can do it.

Updates #1310

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-03-09 12:53:02 -08:00
committed by Brad Fitzpatrick
parent 66480755c2
commit 79d8288f0a
5 changed files with 124 additions and 3 deletions
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9
wgengine/magicsock/magicsock.go
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@@ -1465,6 +1465,15 @@ func (c *Conn) runDerpReader(ctx context.Context, derpFakeAddr netaddr.IPPort, d
peerPresent[m.Source] = true
c.addDerpPeerRoute(m.Source, regionID, dc)
}
case derp.PingMessage:
// Best effort reply to the ping.
pingData := [8]byte(m)
go func() {
if err := dc.SendPong(pingData); err != nil {
c.logf("magicsock: derp-%d SendPong error: %v", regionID, err)
}
}()
continue
default:
// Ignore.
continue