ouroboros, branch 0.24.0

ipcpd: Remove mutex on DT stats

2026-07-19T09:44:36+00:00

There was a bug where the flow's stat mutex was zero'd while held. Removed the mutex alltogether; use stamp != 0 as the validity guard of the flow stats while reading stats. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

ipcpd: Add congestion avoidance unit tests

2026-07-19T09:44:36+00:00

Cover the shared per-aggregate contexts, the mb-ecn policy and the link capacity estimator. The controller tests pin the invariants of the algorithm: the first mark is reported immediately, the receiver's congestion mean is independent of packet rate and its window adapts to hold a fixed sample count, increase and decrease are invariant under control cadence, a starved sender still cuts and later recovers, signals age out on rate-relative horizons, capacity feedback derives the rate floor and recovery slope with clamps and a staleness fallback, and the pacer bounds the burst after idle. The estimator tests drive synthetic arrival traces: the capacity code survives a round trip within its resolution, hops combine by MIN, busy-period drain measures the link rate, windows extend on slow links, sparse idle observations are tolerated where unsaturated windows are rejected, shaped links measure at the shaped rate, stale windows are discarded, and windows bordering an empty queue can only lower the estimate. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

ipcpd: Rework congestion avoidance

2026-07-19T09:44:36+00:00

Congestion avoidance is a property of the layer, orthogonal to ARQ and to flow control: FRCP retransmits and lets the peer pace the sender, per flow, end-to-end; the IPCP paces path aggregates. Each signal means one thing: a loss triggers a retransmission, a mark means congestion, the peer window means a slow receiver. Every flow is paced by the same rate law whatever its QoS, so a greedy raw sender shares a bottleneck fairly with a reliable stream. The unit of control is the (destination address, QoS cube) aggregate: all flows toward that destination share one controller and one rate; a start-time fair-queuing pacer divides the rate across them by deadline instead of blocking the send path, and a new flow rides the aggregate's estimates at its current rate, with no probing of its own. Slow start runs once per aggregate. The congestion signal is a multi-bit magnitude: forwarders mark packets with their standing queue depth, MAX-combined across hops, so a packet carries the deepest queue on its path. The receiver feeds back a time-integral mean over a window that adapts to the flow's byte rate, measuring a slow flow with the same fidelity as a fast one. The sender runs AIMD scaled by elapsed wall-clock time, which makes the steady-state allocation RTT-independent. The PCI gains one byte: the path capacity as a quarter-log2 code. Forwarders estimate their egress rate from busy-period drain and MIN-stamp the byte, the receiver returns the window minimum with its feedback, and the sender scales its rate floor and additive slope to the bottleneck (C / 32). A deep cut implies a backlogged bottleneck and a backlogged bottleneck advertises its capacity, so the scaled floor is live exactly when recovery needs it: the probe heals a halving in seconds at any link rate, and the floor bounds the deepest hole to a factor 32 below the bottleneck. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

tools: Raise ocbr server thread pool to 64

2026-07-19T09:44:36+00:00

10 threads is not enough to deeply test congestion avoidance. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

irmd: Fix congestion config from file

2026-07-19T09:44:35+00:00

The configfile logic was matching "lfa" instead of "mb-ecn". Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

irmd: Reject rekey without KEX config

2026-07-19T09:44:35+00:00

A rekey without KEX config should be rejected rather than downgrading to plaintext. Tests added. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

lib: Whitespace cleanup in dev and frct

2026-07-19T09:44:35+00:00

Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

tools: Key oftp cleanup on path arguments

2026-07-19T09:44:35+00:00

The cleanup guards compared the stream against the stdin/stdout globals, which tripped the clang static analyzer. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

irmd: Fix oap_test suppression list

2026-07-19T09:44:35+00:00

he crypto-disabled branch of the test driver referenced two tests that were folded into test_oap_ts_reject_all() and missed newer ones. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders

lib: Fix crypt_test without crypto backend

2026-07-19T09:44:35+00:00

Creating a context without OpenSSL fails (returns NULL) after adding the key rotation logic (requires HKDF). Assert instead that context creation returns NULL without OpenSSL. Signed-off-by: Dimitri Staessens Signed-off-by: Sander Vrijders