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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

Added

  • Added Verification Tag validation on incoming packets as per RFC 9260 Section 8.5.
  • Validate incoming DATA/IDATA/FORWARD-TSN/I-FORWARD-TSN chunk types match negotiated message interleaving capability.
  • Validate incoming FORWARD-TSN/I-FORWARD-TSN to match negotiated partial reliability capability.
  • Added prevention of state cookie forging and capability bypass.

Fixed

  • Account payload size of the deferred forward TSN messages.
  • Refactored ReassemblyQueue byte tracking into smaller parts, fixing integer underflows and double-counting bugs.
  • Discard FORWARD-TSN with invalid TSN.
  • Stop heartbeat timeout only after validating nonce in HEARTBEAT-ACK.
  • Dropping/truncating oversized Unrecognized or HEARTBEAT chunks.
  • Avoid panic on unordered interleaved streams when receiving crafted MIDs.

Changed

  • Refactored RFC1982 serial number types.

0.1.13 - 2026-05-20

Fixed

  • Explicitly flush buffered packets in the send queue upon receiving a COOKIE-ACK chunk.

0.1.12 - 2026-04-13

Fixed

  • Align sender and receiver to signal advertised receiver window size as payload bytes, excluding any headers.
  • Support receiving invalid SACKs causing serial number arithmetic wrapping.

0.1.11 - 2026-04-08

Fixed

  • Possible incorrect RTT calculation on packet loss.
  • Possible debug assertion when acknowledging fast retransmit chunks.
  • Support receiving invalid and old/crafted SACKs.
  • Fixed shutdown timer and duplicate SHUTDOWN handling in SHUTDOWN-ACK-SENT.

0.1.10 - 2026-02-26

Fixed

  • Relaxed sequence number handling for stream reset requests.
  • Corrected outgoing requests to be compliant with RFC6525.

Changed

  • Optimized performance of message reassembly.

0.1.9 - 2026-02-16

Fixed

  • Corrected "Fast Recovery" retransmission logic.
  • Corrected outstanding data calculation.
  • Added OnLifecycleMessageFullySent lifecycle events when sending message.
  • Fixed bug where delayed SACKs would be sent immediately when time advances.

0.1.8 - 2026-02-06

Changed

  • Replaced rng crate dependency with more lightweight fastrand.
  • Removed dependency on crc_any crate.
  • The rwnd member in handover state has been renamed to a_rwnd.

Fixed

  • Fixed a wrapping substraction during zero window probing.
  • Improved chunk validation

0.1.7 - 2026-01-21

Fixed

  • Fixed a socket handover bug.

0.1.6 - 2026-01-19

Fixed

  • Fixed a bug with simultaneous connection attempts.

0.1.5 - 2026-01-15

Added

  • DcSctpSocket::send_many() is now implemented and accessible with CXX.
  • Exposed handover methods and structs in the CXX interface.
  • Added dcsctp_cxx::get_metrics() and dcsctp_cxx::reset_streams() to the CXX interface, making it expose the full DcSctpSocket trait.

Changed

  • The code is now compatible with Rust 2024 edition.
  • Updated CXX interface for dcsctp_cxx::send() to avoid copying the message payload.
  • Handover is now code complete, compatible with the C++ implementation.

0.1.4 - 2026-01-12

Added

  • Most of the API methods are exposed in CXX.

0.1.3 - 2026-01-09

Changed

  • The cxx child crate is now part of the parent crate, as an optional feature.
  • Time handling is revised, to use a custom SocketTime instead of Instant.
  • Added CXX FFI for time handling.

0.1.2 - 2025-12-15

Added

  • Added cxx child crate for C++ interoperability.

0.1.1 - 2025-08-21

Added

  • Exposed Socket in the public API.

Changed

  • A pull-based API for receiving messages, which allows for back-pressure to be applied when the application can't consume messages fast enough.

0.1.0 - 2025-08-12

First release.