Hi, IPPROTO_MPTCP value (0x106) can't be represented using the current sock diag uAPI, as the 'sdiag_protocol' field is 8 bits wide.
To implement diag support for MPTCP socket, we will likely need a 'inet_diag_req_v3' with a wider 'sdiag_protocol' field. inet_diag_handler_cmd() could detect the version of the inet_diag_req_v* provided by user-space checking nlmsg_len() and convert _v2 reqs to _v3. This change will be a bit invasive, as all in kernel diag users will then operate only on 'inet_diag_req_v3' (many functions' signature change required), but the code-related changes will be encapsulated by inet_diag_handler_cmd(). Would the above be acceptable? Thanks for any feedback! Paolo
