The current kernel does not provide any diagnostic tool, except getsockopt(TCP_ULP), to know more about TCP sockets that have an upper layer protocol (ULP) on top of them. This series extends the set of information exported by INET_DIAG_INFO, to include data that are specific to the ULP (and that might be meaningful for debug/testing purposes).
patch 1/2 extends INET_DIAG_INFO and allows knowing the ULP name for each TCP socket that has done setsockopt(TCP_ULP) successfully. kernel TLS is the only TCP ULP user at the moment: patch 2/2 extends kTLS to let programs like 'ss' know the protocol version and the cipher in use. Davide Caratti (2): tcp: ulp: add functions to dump ulp-specific information net: tls: export protocol version and cipher to socket diag include/net/tcp.h | 3 +++ include/uapi/linux/inet_diag.h | 9 +++++++ include/uapi/linux/tls.h | 8 +++++++ net/ipv4/tcp_diag.c | 34 +++++++++++++++++++++++++-- net/tls/tls_main.c | 43 ++++++++++++++++++++++++++++++++++ 5 files changed, 95 insertions(+), 2 deletions(-) -- 2.20.1
