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
