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Diffstat (limited to 'spec/tor-spec/relay-early.md')
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diff --git a/spec/tor-spec/relay-early.md b/spec/tor-spec/relay-early.md new file mode 100644 index 0000000..fd7dbf4 --- /dev/null +++ b/spec/tor-spec/relay-early.md @@ -0,0 +1,20 @@ +<a id="tor-spec.txt-5.6"></a> + +# Handling RELAY_EARLY cells{#handling-relay-early-cells} + +A RELAY_EARLY cell is designed to limit the length any circuit can reach. +When an OR receives a RELAY_EARLY cell, and the next node in the circuit +is speaking v2 of the link protocol or later, the OR relays the cell as a +RELAY_EARLY cell. Otherwise, older Tors will relay it as a RELAY cell. + +If a node ever receives more than 8 RELAY_EARLY cells on a given +outbound circuit, it SHOULD close the circuit. If it receives any +inbound RELAY_EARLY cells, it MUST close the circuit immediately. + +When speaking v2 of the link protocol or later, clients MUST only send +EXTEND/EXTEND2 message inside RELAY_EARLY cells. Clients SHOULD send the first +~8 relay cells that are not targeted at the first hop of any circuit as +RELAY_EARLY cells too, in order to partially conceal the circuit length. + +\[Starting with Tor 0.2.3.11-alpha, relays should reject any +EXTEND/EXTEND2 cell not received in a RELAY_EARLY cell.\] |