13 April 2021 - mptcpd 0.7

- MPTCP path management generic netlink events recently added to the
  upstream Linux kernel are now supported, and propagated to mptcpd
  plugins.  The same API is also found in the multipath-tcp.org
  kernel.  Differences between the two kernels are transparent to
  mptcpd plugins.

- Mptcpd now supports the upstream Linux kernel server-oriented
  MPTCP_PM_CMD_SET_FLAGS generic netlink command through the new
  mptcpd_pm_set_flags() function.  It allows the user to set MPTCP
  flags for a specific local IP address.

- An incorrect buffer size calculation when calling
  mptcpd_pm_add_addr() when using an IPv6 addresses on platforms
  running the upstream Linux kernel was corrected.

- An "operation not supported" error that occurred when attempting to
  retrieve MPTCP resource limits through the mptcpd_pm_get_limits()
  function was fixed.

- A network interface lookup problem in the "sspi" plugin was
  corrected.

- Building mptcpd against ELL 0.39 is now supported.

25 January 2021 - mptcpd 0.6

- Mptcpd now supports versions of the Embedded Linux Library (ELL)
  greater than 0.33.

- Plugins should use the new MPTCPD_PLUGIN_DEFINE() preprocessor macro
  instead of L_PLUGIN_DEFINE().

- A pointer to the mptcpd path manager object, i.e. struct mptcpd *pm,
  is now passed to the plugin init and exit functions.  This allows
  plugins to potentially perform mptcpd path manager related
  operations during initialization and finalization.

- Support for the MPTCP netlink path manager in the upstream Linux
  kernel is now available.  A new set of path management command
  functions corresponding to those available in the kernel netlink
  path management API has been added to the `<mptcpd/path_manager.h>'
  header.  The new functions allow plugins to retrieve IP address
  information, flush addresses, and modify MPTCP resource limits.

- The mptcpd_pm_add_addr() (formerly mptcpd_pm_send_addr()) and
  mptcpd_pm_remove_addr() function parameters have been modified in
  order to support both the upstream and multipath-tcp.org kernels.

- Mptcpd path management command functions declared in
  `<mptcpd/path_manager.h>' now return zero on success and -1 or an
  errno on failure instead of a bool.

- A MPTCP address ID manager "mptcpd_idm" interface was introduced
  that mptcpd plugins may leverage to map an IP address to a MPTCP
  address ID, as well as to track used and unused IDs.  The interface
  is defined in the new `<mptcpd/id_manager.h>' header.

- A new address advertising plugin, "addr_adv", has been added.  It
  simply triggers a MPTCP ADD_ADDR when a new IP address is detected
  by the mptcpd network monitor.  Similarly, a MPTCP REMOVE_ADDR is
  triggered when an IP address is no longer available.

- MPTCP netlink command error message logging was improved to be more
  descriptive when possible.

12 June 2020 - mptcpd 0.5

- Test plugins are no longer installed when running "make install".  A
  side benefit of the changes is that test plugins only build when the
  test suite is built via "make check" or "make distcheck".  Libtool
  relink warnings that occurred when building the tests have also been
  addressed.

- VPATH builds where the build directory and source directory
  differ (e.g. "mkdir build; cd build; ../configure; make") now
  succeed.

21 May 2020 - mptcpd 0.4

- Plugins may now inform peers that an address is no longer being
  advertised through the new mptcpd_pm_remove_addr() function.  This
  corresponds to the MPTCP protocol REMOVE_ADDR option.

- Network monitoring related events are now propagated to plugins.
  Events are triggered upon the addition, update, and removal of a
  network interface (link), as well as the addition and removal of a
  network address.  Plugins interested in receiving any of these
  events need only implement the corresponding callback in the
  `mptcpd_plugin_ops' API found in `<mptcpd/plugin.h>'.

- Stub implementations for unused mptcpd plugin operations are no
  longer needed.  Simply set the unused field in the
  `mptcpd_plugin_ops' structure to NULL.

18 December 2019 - mptcpd 0.3

- This is the Multipath TCP Daemon beta release.

- All known memory leaks have been fixed.

- A potential security hole related to logging of MPTCP connection
  tokens was closed.  Logging of MPTCP connection tokens no longer
  occurs.

- Support for compiler-based address, leak, and undefined behavior
  sanitizers is now available, and may be enabled through
  corresponding `configure' script options.  Run `./configure --help'
  for the full list of options.

- Diagnostic messages will be issued if the Linux kernel is not
  properly configured to support a user space MPTCP path manager like
  mptcpd.

- Documentation on how to contribute to mptcpd is available in the
  `CONTRIBUTING.md' file.

- A pkg-config `mptcpd.pc' file is now generated and installed to
  allow plugin developers to more easily obtain the necessary mptcpd
  build related information, such as compiler and linker command line
  flags.

- The mptcpd plugin API dropped the mptcpd_addr type in favor of the
  standard sockaddr family of structures.

- Debugger-friendly optimization is now supported.

- ELL 0.27 or better is now required due to changes in the ELL generic
  netlink API.

11 June 2019 - mptcpd 0.2a

- This Multipath TCP Daemon alpha release replaces support for the
  deprecated MPTCP generic netlink API with the one found in the
  multipath-tcp.org kernel (0.95+), and has been verified to work with
  that kernel.

- Several actual and potential memory access violations were fixed in
  the mptcpd network monitor, path manager, and "sspi" plugin.

- The mptcp.service systemd service file now correctly grants the
  necessary privilege (CAP_NET_ADMIN) for proper operation of the
  mptcpd program.

27 March 2019 - mptcpd 0.1a

- This is the initial (alpha) release of the Multipath TCP Daemon
  "mptcpd".  It implements MPTCP path management in the user space by
  providing a framework that bridges user defined path management
  strategies - i.e. mptcpd plugins - with the Linux kernel side MPTCP
  implementation over a generic netlink interface.

- The generic netlink interface employed by the Multipath TCP Daemon
  is based on an early proposal, and will be superseded by the
  interface available in the MPTCP development kernel, i.e.:
        https://github.com/multipath-tcp/mptcp/commit/4ea5dee

- In addition to the kernel/user space path management bridging, the
  Multipath TCP Daemon also monitors changes to local network
  interfaces and addresses that path management strategies may choose
  to leverage.  Currently, network interfaces and addresses may be
  queried (pulled).  A network event notification mechanism for
  plugins is currently a work-in-progress.

- A single-subflow-per-interface - "sspi" - plugin is included in the
  source distribution as a reference.   It enforces a single subflow
  per network interface per MPTCP connection policy.  Available local
  addresses are also sent to the kernel so that they may be advertised
  to the peer through a MPTCP ADD_ADDR option.  The current
  implementation depends on the remote peer to initiate subflows,
  which may then be allowed or closed per this plugin's policy.
  Explicitly adding new subflows through this plugin is currently
  unsupported, but is expected to be implemented in the future.
