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Block forwarding of an onion message when the resolved next hop is the same peer that delivered it. Such a forward would immediately bounce the message back over the very connection it arrived on, which is never useful and can be abused to amplify traffic against a peer. The check runs after the routing action is resolved, so both direct next-node-ID and SCID-resolved paths are covered. A new `ErrSamePeerCycle` is returned (and logged at warn level) when a cycle is detected.
22 lines
709 B
Go
22 lines
709 B
Go
package onionmessage
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import "errors"
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var (
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// ErrActorShuttingDown is returned by the actor logic when its context
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// is cancelled.
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ErrActorShuttingDown = errors.New("actor shutting down")
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// ErrNextNodeIdEmpty is returned when the next node ID is missing from
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// the route data.
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ErrNextNodeIdEmpty = errors.New("next node ID empty")
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// ErrSCIDEmpty is returned when the short channel ID is missing from
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// the route data.
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ErrSCIDEmpty = errors.New("short channel ID empty")
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// ErrSamePeerCycle is returned when a forwarding onion message
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// would be sent back to the same peer it was received from.
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ErrSamePeerCycle = errors.New("onion message cycle: next " +
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"hop is the sending peer")
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)
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