[mptcp-next 0/7] Add 'dump_subflow' test in selftests

[Gang Yan <yangang@kylinos.cn>]

The 'subflow_get_info_size' is called only in 'inet_sk_attr_size', and
the only calltrace is that 'tcp_diag_dump_one'->'inet_diag_dump_one_icsk'
->'inet_sk_attr_size'.

So It's necessary to add 'get_subflow_info' in mptcp_diag.c to cover this
function. Given a specific TCP connection, it is possible to judge if
it is a MPTCP subflow by 'INET_ULP_INFO_MPTCP' and print 'subflow_info'.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/524

Gang Yan (7):
  selftests: mptcp: add struct params in mptcp_diag
  selftests: mptcp: refactor send_query parameters for code clarity
  selftests: mptcp: refine the 'iovlen' handling logic
  selftests: mptcp: refactor NLMSG handling with 'proto'
  selftests: mptcp: add a helper to get subflow_info
  selftests: mptcp: add a helper to print subflow_info
  selftests: mptcp: add chk_sublfow in diag.sh

 tools/testing/selftests/net/mptcp/diag.sh     |  55 +++++
 .../testing/selftests/net/mptcp/mptcp_diag.c  | 223 +++++++++++++++---
 2 files changed, 248 insertions(+), 30 deletions(-)

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2.25.1