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Date:   Fri, 25 Nov 2022 23:29:46 +0100
From:   Matthieu Baerts <>
To:     "David S. Miller" <>,
        Eric Dumazet <>,
        Jakub Kicinski <>,
        Mat Martineau <>,
        Matthieu Baerts <>,
        Paolo Abeni <>, Shuah Khan <>
Cc:     Benjamin Hesmans <>,,,,
Subject: [PATCH net-next 0/8] mptcp: MSG_FASTOPEN and TFO listener side support

Before this series, only the initiator of a connection was able to combine both
TCP FastOpen and MPTCP when using TCP_FASTOPEN_CONNECT socket option.

These new patches here add (in theory) the full support of TFO with MPTCP, which

 - MSG_FASTOPEN sendmsg flag support (patch 1/8)
 - TFO support for the listener side (patches 2-5/8)
 - TCP_FASTOPEN socket option (patch 6/8)
 - TCP_FASTOPEN_KEY socket option (patch 7/8)

To support TFO for the server side, a few preparation patches are needed
(patches 2 to 5/8). Some of them were inspired by a previous work from Benjamin

Note that TFO support with MPTCP has been validated with selftests (patch 8/8)
but also with Packetdrill tests running with a modified but still very WIP
version supporting MPTCP. Both the modified tool and the tests are available

Dmytro Shytyi (5):
  mptcp: add MSG_FASTOPEN sendmsg flag support
  mptcp: implement delayed seq generation for passive fastopen
  mptcp: add subflow_v(4,6)_send_synack()
  mptcp: add TCP_FASTOPEN sock option
  selftests: mptcp: mptfo Initiator/Listener

Matthieu Baerts (1):
  mptcp: add support for TCP_FASTOPEN_KEY sockopt

Paolo Abeni (2):
  mptcp: track accurately the incoming MPC suboption type
  mptcp: consolidate initial ack seq generation

 net/mptcp/Makefile                            |   2 +-
 net/mptcp/fastopen.c                          |  73 ++++++++
 net/mptcp/options.c                           |  25 ++-
 net/mptcp/protocol.c                          |  39 +---
 net/mptcp/protocol.h                          |  28 ++-
 net/mptcp/sockopt.c                           |   9 +-
 net/mptcp/subflow.c                           | 105 ++++++++---
 .../selftests/net/mptcp/mptcp_connect.c       | 171 +++++++++++++-----
 .../selftests/net/mptcp/      |  21 +++
 9 files changed, 358 insertions(+), 115 deletions(-)
 create mode 100644 net/mptcp/fastopen.c

Cc: Benjamin Hesmans <>
base-commit: a6e3d86ece0b42a571a11055ace5c3148cb7ce76

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