basic support for MPTCP sockets diag interface.

The first patch update the required headers, while the 2nd one bring in
the actual implementation

v1 -> v2:
 - updated to diag uAPI change (ack,fallback -> flags)

Paolo Abeni (2):
  include: update mptcp uAPI
  ss: mptcp: add msk diag interface support

 include/uapi/linux/inet_diag.h |   1 +
 include/uapi/linux/mptcp.h     |  17 +++++
 misc/ss.c                      | 115 ++++++++++++++++++++++++++++++---
 3 files changed, 123 insertions(+), 10 deletions(-)

-- 
2.26.2