This series allows the MPTCP-level connection to be closed with the
peers exchanging DATA_FIN and DATA_ACK according to the state machine in
appendix D of RFC 8684. The process is very similar to the TCP
disconnect state machine.
The prior code sends DATA_FIN only when TCP FIN packets are sent, and
does not allow for the MPTCP-level connection to be half-closed.
Patch 8 ("mptcp: Use full MPTCP-level disconnect state machine") is the
core of the series. Earlier patches in the series have some small fixes
and helpers in preparation, and the final four small patches do some
cleanup.
Mat Martineau (12):
mptcp: Allow DATA_FIN in headers without TCP FIN
mptcp: Return EPIPE if sending is shut down during a sendmsg
mptcp: Remove outdated and incorrect comment
mptcp: Use MPTCP-level flag for sending DATA_FIN
mptcp: Track received DATA_FIN sequence number and add related helpers
mptcp: Add mptcp_close_state() helper
mptcp: Add helper to process acks of DATA_FIN
mptcp: Use full MPTCP-level disconnect state machine
mptcp: Only use subflow EOF signaling on fallback connections
mptcp: Skip unnecessary skb extension allocation for bare acks
mptcp: Safely read sequence number when lock isn't held
mptcp: Safely store sequence number when sending data
net/mptcp/options.c | 57 +++++++--
net/mptcp/protocol.c | 295 ++++++++++++++++++++++++++++++++++++-------
net/mptcp/protocol.h | 6 +-
net/mptcp/subflow.c | 14 +-
4 files changed, 306 insertions(+), 66 deletions(-)
base-commit: 0003041e7a0bf24594e5d66fe217bbbefdac44ab
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2.28.0
