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 1/3 ensures that the control plane reads/updates ULP specific data using RCU. patch 2/3 extends INET_DIAG_INFO and allows knowing the ULP name for each TCP socket that has done setsockopt(TCP_ULP) successfully. patch 3/3 extends kTLS to let programs like 'ss' know the protocol version and the cipher in use. Changes since RFC: - some coding style fixes, thanks to Jakub Kicinski - add X_UNSPEC as lowest value of uAPI enums, thanks to Jakub Kicinski - fix assignment of struct nlattr *start, thanks to Jakub Kicinski - let tls dump RXCONF and TXCONF, suggested by Jakub Kicinski - don't dump anything if TLS version or cipher are 0 (but still return a constant size in get_aux_size()), thanks to Boris Pismenny - constify first argument of get_info() and get_size() - use RCU to access access ulp_ops, like it's done for ca_ops - add patch 1/3, from Jakub Kicinski Davide Caratti (2): tcp: ulp: add functions to dump ulp-specific information net: tls: export protocol version, cipher, tx_conf/rx_conf to socket diag Jakub Kicinski (1): net/tls: use RCU protection on icsk->icsk_ulp_data include/net/inet_connection_sock.h | 2 +- include/net/tcp.h | 3 ++ include/net/tls.h | 28 +++++++++- include/uapi/linux/inet_diag.h | 9 ++++ include/uapi/linux/tls.h | 15 ++++++ net/core/sock_map.c | 2 +- net/ipv4/tcp_diag.c | 56 ++++++++++++++++++- net/tls/tls_device.c | 2 +- net/tls/tls_main.c | 87 +++++++++++++++++++++++++++--- 9 files changed, 191 insertions(+), 13 deletions(-) -- 2.20.1