From patchwork Mon Aug 16 16:26:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Westphal X-Patchwork-Id: 12438845 Received: from Chamillionaire.breakpoint.cc (Chamillionaire.breakpoint.cc [193.142.43.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BEED7173 for ; Mon, 16 Aug 2021 16:26:50 +0000 (UTC) Received: from fw by Chamillionaire.breakpoint.cc with local (Exim 4.92) (envelope-from ) id 1mFfRj-0007ey-8K; Mon, 16 Aug 2021 18:26:43 +0200 From: Florian Westphal To: Cc: Florian Westphal Subject: [PATCH mptcp-next v2 0/5] mptcp: add SOL_MPTCP getsockopt support Date: Mon, 16 Aug 2021 18:26:31 +0200 Message-Id: <20210816162636.25611-1-fw@strlen.de> X-Mailer: git-send-email 2.31.1 Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Changes in v2: - move #define to start of file (Mat) - refer to '"multipath-tcp.org"', not mptcp.org (Mat) - use __kernel_sa_family_t in uapi header (test robot) - add test cases with invalid inputs (Paolo) - avoid duplicate mptcp_sockopt.h in Makefile (Paolo) - remove _u_optlen (Paolo) original cover letter: This adds the MPTCP_INFO, MPTCP_TCPINFO and MPTCP_SUBFLOW_ADDRS mptcp getsockopt optnames. MPTCP_INFO exposes the mptcp_info struct as an alternative to the existing netlink diag interface. MPTCP_TCPINFO exposes the tcp_info struct. Unlike SOL_TCP/TCP_INFO, this returns one struct for each active subflow. MPTCP_SUBFLOW_ADDRS allows userspace to discover the ip addresses/ports used by the local and remote endpoints, one for each active tcp subflow. MPTCP_TCPINFO and MPTCP_SUBFLOW_ADDRS share the same meta-header that needs to be pre-filled by userspace with the size of the data structures it expects. This is done to allow extension of the involved structs later on, without breaking backwards compatibility. The meta-structure can also be used to discover the required space to obtain all information, as kernel will fill in the number of active subflows even if there is not enough room for the requested info itself. More information is available in the individual patches. Last patch adds test cases for the three optnames. Florian Westphal (5): mptcp: add new mptcp_fill_diag helper mptcp: add MPTCP_INFO getsockopt mptcp: add MPTCP_TCPINFO getsockopt support mptcp: add MPTCP_SUBFLOW_ADDRS getsockopt support selftests: mptcp: add mptcp getsockopt test cases include/linux/socket.h | 1 + include/net/mptcp.h | 4 + include/uapi/linux/mptcp.h | 29 + net/mptcp/mptcp_diag.c | 26 +- net/mptcp/sockopt.c | 276 ++++++++ tools/testing/selftests/net/mptcp/Makefile | 2 +- .../selftests/net/mptcp/mptcp_sockopt.c | 638 ++++++++++++++++++ .../selftests/net/mptcp/mptcp_sockopt.sh | 31 +- 8 files changed, 979 insertions(+), 28 deletions(-) create mode 100644 tools/testing/selftests/net/mptcp/mptcp_sockopt.c