Mat Martineau says:
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mptcp: Improve socket option handling
MPTCP sockets have previously had limited socket option support. The
architecture of MPTCP sockets (one userspace-facing MPTCP socket that
manages one or more in-kernel TCP subflow sockets) adds complexity for
passing options through to lower levels. This patch set adds MPTCP
support for socket options commonly used with TCP.
Patch 1 reverts an interim socket option fix (a socket option blocklist)
that was merged in the net tree for v5.12.
Patch 2 moves the socket option code to a separate file, with no
functional changes.
Patch 3 adds an allowlist for socket options that are known to function
with MPTCP. Later patches in this set add more allowed options.
Patches 4 and 5 add infrastructure for syncing MPTCP-level options with
the TCP subflows.
Patches 6-12 add support for specific socket options.
Patch 13 adds a socket option self test.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>