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wgengine/magicsock: trigger peer relay path discovery on CallMeMaybe RX (#16929)

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Updates tailscale/corp#30333

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2025-08-25 09:40:15 -07:00
committed by GitHub
parent b5f834aef8
commit 9403ba8c69
1 changed files with 19 additions and 1 deletions
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20
wgengine/magicsock/endpoint.go
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@@ -1964,7 +1964,25 @@ func (de *endpoint) handleCallMeMaybe(m *disco.CallMeMaybe) {
for _, st := range de.endpointState {
st.lastPing = 0
}
de.sendDiscoPingsLocked(mono.Now(), false)
monoNow := mono.Now()
de.sendDiscoPingsLocked(monoNow, false)
// This hook is required to trigger peer relay path discovery around
// disco "tailscale ping" initiated by de. We may be configured with peer
// relay servers that differ from de.
//
// The only other peer relay path discovery hook is in [endpoint.heartbeat],
// which is kicked off around outbound WireGuard packet flow, or if you are
// the "tailscale ping" initiator. Disco "tailscale ping" does not propagate
// into wireguard-go.
//
// We choose not to hook this around disco ping reception since peer relay
// path discovery can also trigger disco ping transmission, which *could*
// lead to an infinite loop of peer relay path discovery between two peers,
// absent intended triggers.
if de.wantUDPRelayPathDiscoveryLocked(monoNow) {
de.discoverUDPRelayPathsLocked(monoNow)
}
}
func (de *endpoint) populatePeerStatus(ps *ipnstate.PeerStatus) {