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[188.141.5.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488fc1c01cfsm413350505e9.10.2026.04.21.15.33.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 15:33:45 -0700 (PDT) From: David Carlier To: mptcp@lists.linux.dev Cc: Matthieu Baerts , Mat Martineau , Geliang Tang , David Carlier Subject: [PATCH mptcp-next v3 3/3] selftests: mptcp: cover IP_RECVERR sockopt propagation Date: Tue, 21 Apr 2026 23:33:38 +0100 Message-ID: <20260421223338.52743-4-devnexen@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260421223338.52743-1-devnexen@gmail.com> References: <20260421223338.52743-1-devnexen@gmail.com> Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Exercise setsockopt/getsockopt of IP_RECVERR and IPV6_RECVERR on the MPTCP parent socket, including the empty-errqueue EAGAIN contract on MSG_ERRQUEUE|MSG_DONTWAIT. End-to-end errqueue delivery (ICMP, TX timestamps, zerocopy) depends on subflow-side producers that are out of scope for this series and will be covered by follow-up work. Assisted-by: Codex:gpt-5 Signed-off-by: David Carlier --- .../selftests/net/mptcp/mptcp_sockopt.c | 55 +++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c index b6e58d936ebe..95bb2cc8e2ff 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_sockopt.c +++ b/tools/testing/selftests/net/mptcp/mptcp_sockopt.c @@ -769,6 +769,60 @@ static void test_ip_tos_sockopt(int fd) xerror("expect socklen_t == -1"); } +static void test_ip_recverr_sockopt(int fd) +{ + struct iovec iov = { + .iov_base = &(char){ 0 }, + .iov_len = 1, + }; + struct msghdr msg = { + .msg_iov = &iov, + .msg_iovlen = 1, + }; + int one = 1, zero = 0, val = -1; + socklen_t s = sizeof(val); + int level, optname, r; + + switch (pf) { + case AF_INET: + level = SOL_IP; + optname = IP_RECVERR; + break; + case AF_INET6: + level = SOL_IPV6; + optname = IPV6_RECVERR; + break; + default: + xerror("Unknown pf %d\n", pf); + } + + r = setsockopt(fd, level, optname, &one, sizeof(one)); + if (r) + die_perror("setsockopt recverr on"); + + r = getsockopt(fd, level, optname, &val, &s); + if (r) + die_perror("getsockopt recverr on"); + if (s != sizeof(val) || val != one) + xerror("recverr on mismatch val=%d len=%u", val, s); + + r = recvmsg(fd, &msg, MSG_ERRQUEUE | MSG_DONTWAIT); + if (r != -1 || errno != EAGAIN) + xerror("expected empty errqueue to return EAGAIN, ret=%d errno=%d", r, errno); + + r = setsockopt(fd, level, optname, &zero, sizeof(zero)); + if (r) + die_perror("setsockopt recverr off"); + + val = -1; + s = sizeof(val); + r = getsockopt(fd, level, optname, &val, &s); + if (r) + die_perror("getsockopt recverr off"); + if (s != sizeof(val) || val != zero) + xerror("recverr off mismatch val=%d len=%u", val, s); +} + static int client(int pipefd) { int fd = -1; @@ -787,6 +841,7 @@ static int client(int pipefd) } test_ip_tos_sockopt(fd); + test_ip_recverr_sockopt(fd); connect_one_server(fd, pipefd); -- 2.53.0