This introduces basic mptcp sockets diag support.
As IPPROTO_MPTCP excedes 8 bits, we need some changes at the inet_diag level:
a new attribute is introduced to allow user-space providing u32 protocol
values.

Patch 2 introduces new token APIs to allow traversing the existing msks, while
patch 3 bring in the actual diag implementation.

Paolo Abeni (3):
  inet_diag: support for wider protocol numbers
  mptcp: add msk interations helpers
  mptcp: add MPTCP socket diag interface

 include/uapi/linux/inet_diag.h |   1 +
 include/uapi/linux/mptcp.h     |  15 ++++
 net/core/sock.c                |   1 +
 net/ipv4/inet_diag.c           |  63 +++++++++----
 net/mptcp/Kconfig              |   4 +
 net/mptcp/Makefile             |   2 +
 net/mptcp/mptcp_diag.c         | 160 +++++++++++++++++++++++++++++++++
 net/mptcp/options.c            |   6 +-
 net/mptcp/protocol.h           |   3 +
 net/mptcp/token.c              |  83 +++++++++++++++++
 10 files changed, 318 insertions(+), 20 deletions(-)
 create mode 100644 net/mptcp/mptcp_diag.c

-- 
2.26.2