[PATCH net-next 00/13] mptcp: Improve socket option handling

[Mat Martineau <mathew.j.martineau@linux.intel.com>]

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.


Florian Westphal (10):
  mptcp: add skeleton to sync msk socket options to subflows
  mptcp: tag sequence_seq with socket state
  mptcp: setsockopt: handle SO_KEEPALIVE and SO_PRIORITY
  mptcp: setsockopt: handle receive/send buffer and device bind
  mptcp: setsockopt: support SO_LINGER
  mptcp: setsockopt: add SO_MARK support
  mptcp: setsockopt: add SO_INCOMING_CPU
  mptcp: setsockopt: SO_DEBUG and no-op options
  mptcp: sockopt: add TCP_CONGESTION and TCP_INFO
  selftests: mptcp: add packet mark test case

Matthieu Baerts (1):
  mptcp: revert "mptcp: forbit mcast-related sockopt on MPTCP sockets"

Paolo Abeni (2):
  mptcp: move sockopt function into a new file
  mptcp: only admit explicitly supported sockopt

 net/mptcp/Makefile                            |   2 +-
 net/mptcp/protocol.c                          | 219 ++---
 net/mptcp/protocol.h                          |  16 +
 net/mptcp/sockopt.c                           | 756 ++++++++++++++++++
 net/mptcp/subflow.c                           |   5 +
 tools/testing/selftests/net/mptcp/Makefile    |   2 +-
 .../selftests/net/mptcp/mptcp_connect.c       |  23 +-
 .../selftests/net/mptcp/mptcp_sockopt.sh      | 276 +++++++
 8 files changed, 1122 insertions(+), 177 deletions(-)
 create mode 100644 net/mptcp/sockopt.c
 create mode 100755 tools/testing/selftests/net/mptcp/mptcp_sockopt.sh


base-commit: 3a1aa533f7f676aad68f8dbbbba10b9502903770
-- 
2.31.1