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derp, derphttp, magicsock: send new unknown peer frame when destination is unknown (#7552)

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* wgengine/magicsock: add envknob to send CallMeMaybe to non-existent peer

For testing older client version responses to the PeerGone packet format change.

Updates #4326

Signed-off-by: Val <valerie@tailscale.com>

* derp: remove dead sclient struct member replaceLimiter

Leftover from an previous solution to the duplicate client problem.

Updates #2751

Signed-off-by: Val <valerie@tailscale.com>

* derp, derp/derphttp, wgengine/magicsock: add new PeerGone message type Not Here

Extend the PeerGone message type by adding a reason byte. Send a
PeerGone "Not Here" message when an endpoint sends a disco message to
a peer that this server has no record of.

Fixes #4326

Signed-off-by: Val <valerie@tailscale.com>

---------

Signed-off-by: Val <valerie@tailscale.com>
This commit is contained in:
valscale
2023-03-24 19:11:48 -07:00
committed by GitHub
parent 09d0b632d4
commit 74eb99aed1
12 changed files with 211 additions and 67 deletions
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4
wgengine/magicsock/debugknobs.go
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@@ -36,6 +36,10 @@ var (
// debugEnableSilentDisco disables the use of heartbeatTimer on the endpoint struct
// and attempts to handle disco silently. See issue #540 for details.
debugEnableSilentDisco = envknob.RegisterBool("TS_DEBUG_ENABLE_SILENT_DISCO")
// DebugSendCallMeUnknownPeer sends a CallMeMaybe to a
// non-existent destination every time we send a real
// CallMeMaybe to test the PeerGoneNotHere logic.
debugSendCallMeUnknownPeer = envknob.RegisterBool("TS_DEBUG_SEND_CALLME_UNKNOWN_PEER")
)
// inTest reports whether the running program is a test that set the