mirrors/arti.git/crates/tor-proto/src/congestion, branch arti-v1.4.3

tor-proto: expand docs for `CongestionWindowParams::set_sendme_inc`

2025-04-23T18:38:25Z

tor-proto: rename `allow_stream_sendme` to `uses_stream_sendme`

2025-04-23T18:38:25Z

We use this method to decide whether to allow receiving stream SENDMEs, and also whether we should send stream SENDMEs.

tests: Add CC ntorv3 negotiation unit test

2025-04-23T18:36:28Z

Also add one for the sendme_inc validity function. Part of #1817 Signed-off-by: David Goulet

circ: Don't send stream level SENDME with CC

2025-04-23T18:36:28Z

This adds a new function to the CongestionControl object that returns true or false on if stream level SENDMEs are allowed by the underlying algorithm. Congestion control Vegas doesn't allow them as in it retires them and so we avoid sending them for that algorithm. Part of #1817 Signed-off-by: David Goulet

circ: Apply possible subprotocol changes to circ params

2025-04-23T18:36:28Z

Congestion control can change the circuit parameters if the relay we are negotiating with doesn't support FlowCtrl=2. This commit adds a function in the circuit builder that will apply any changes to the circuit parameters of the hop based on the hop protocol values. For now, only congestion control applies. Part of #1817 Signed-off-by: David Goulet

congestion: Setup a fallback algorithm in the params

2025-04-23T18:36:28Z

CircParameters is built before path selection and thus once we start building the hops, we can't access the consensus values that were used to build it in the first place. For congestion control, we require a fallback algorithm in case the hop doesn't support FlowCtrl=2. This commit adds a "fallback_alg" to the CC parameters which will be used for this exact case. Part of #1817 Signed-off-by: David Goulet

circ: Set the negotiated CC sendme_inc from handshake

2025-04-23T18:36:28Z

When receiving the congestion control response extension, evaluate our state and set the sendme_inc if valid in our circuit parameters. For this, a series of helper functions is needed. Part of #1817 Signed-off-by: David Goulet

Add a RelayCellFormat argument to encode().

2025-04-16T14:58:49Z

This will let us actually _send_ messages in the right format. This approach is not ideal for packed/fragmented messages; they will need a separate RelayCellEncoder. part of #1944.

fix: fix typos

2025-01-30T08:39:30Z

tor-proto: Use SENDME_TAG_LEN constant instead of magic value.

2025-01-28T14:07:53Z