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wgengine/magicsock: don't add DERP addrs to endpointState (#17147)

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endpointState is used for tracking UDP direct connection candidate
addresses. If it contains a DERP addr, then direct connection path
discovery will always send a wasteful disco ping over it. Additionally,
CLI "tailscale ping" via peer relay will race over DERP, leading to a
misleading result if pong arrives via DERP first.

Disco pongs arriving via DERP never influence path selection. Disco
ping/pong via DERP only serves "tailscale ping" reporting.

Updates #17121

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2025-09-15 15:22:13 -07:00
committed by GitHub
parent 09dfd94613
commit 998a667cd5
1 changed files with 1 additions and 4 deletions
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5
wgengine/magicsock/magicsock.go
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@@ -2539,10 +2539,7 @@ func (c *Conn) handlePingLocked(dm *disco.Ping, src epAddr, di *discoInfo, derpN
// Remember this route if not present. // Remember this route if not present.
var dup bool var dup bool
if isDerp { if isDerp {
if ep, ok := c.peerMap.endpointForNodeKey(derpNodeSrc); ok { if _, ok := c.peerMap.endpointForNodeKey(derpNodeSrc); ok {
if ep.addCandidateEndpoint(src.ap, dm.TxID) {
return
}
numNodes = 1 numNodes = 1
} }
} else { } else {