From patchwork Wed Sep 11 15:16:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthieu Baerts (NGI0)" X-Patchwork-Id: 13800809 X-Patchwork-Delegate: matthieu.baerts@tessares.net Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 D4A241AB531; Wed, 11 Sep 2024 15:17:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726067821; cv=none; b=VoqZKP0ZXhXOp6ZZMqZ/JQhu7PYh8kcJW1CoaIm8+Wfl3sKiYgCfG8onrITF/RATJK63sfHECFcPyywgTiRlgojEx0WxidNodzWsMmlAcYp7R0sJf/j+kDOgE2rRno1xnBKLyirgp5rCyUCxtCEwNeWaXbsdKCbLbs/iwuZoEoE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726067821; c=relaxed/simple; bh=rvyB/8VmwsZWv2v7ySK7UI/1A/6GmFKbw04BuegBh08=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=XXMGqmmdhbYplSy5tQFSEkRWsINNsY3Jbb2dBFRipfEOoKCIevvml/TOnTRykRzMcdMqwhEIBCXuCJWgRFSTp+sQxKebYqXnoz5Q1JYCGs+7RFKPpL4T0itiwvsgljXP1tMf2RSujt56yGQ1VLfIxPKJyEk1BPBrmqDhn0CYnu4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jfXzu1kT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jfXzu1kT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6385AC4CEC0; Wed, 11 Sep 2024 15:16:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726067820; bh=rvyB/8VmwsZWv2v7ySK7UI/1A/6GmFKbw04BuegBh08=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=jfXzu1kTnOh0ndVtWIz3OPxKqWdxWX87OKoCoF1n04Ulp6P5gdkKIj5REKOvrEgR6 yRdjlU+W5r1KtxE0vNUMqJ5I3GcWO3v3shGUKTPfmCd6lATdiBSLeZnaPXgqaXfUMf WeZ2FNepwVYiiQeqnqwNgNudpM2qR6DUD8fT6/J0pIVCsZQzVPW779j6VYDDat3Ub+ qj0y1LI+sjtnSWcLyaV6XcJOc/zJpRkHCLKFJL7sjlOMZVUUQkVoMf8T0Ne1zCUBKO l94Xjg35yUZls65OlDC8zzMrrIdi4BKKaDatxaqjbwLab/Gz+45BdriSs7+/kTBg/j OSaOhfceOGzFA== From: "Matthieu Baerts (NGI0)" Date: Wed, 11 Sep 2024 17:16:18 +0200 Subject: [PATCH bpf-next/net v6 3/3] selftests/bpf: Add mptcp subflow subtest Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240911-upstream-bpf-next-20240506-mptcp-subflow-test-v6-3-7872294c466b@kernel.org> References: <20240911-upstream-bpf-next-20240506-mptcp-subflow-test-v6-0-7872294c466b@kernel.org> In-Reply-To: <20240911-upstream-bpf-next-20240506-mptcp-subflow-test-v6-0-7872294c466b@kernel.org> To: mptcp@lists.linux.dev, Mat Martineau , Geliang Tang , Andrii Nakryiko , Eduard Zingerman , Mykola Lysenko , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, "Matthieu Baerts (NGI0)" , Geliang Tang X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=6367; i=matttbe@kernel.org; h=from:subject:message-id; bh=jl0fkReOPsHzDsa1dsyKuB9rta8BrobgXpXnIKQtdD8=; b=owEBbQKS/ZANAwAIAfa3gk9CaaBzAcsmYgBm4bRYeiAzV9g4F+34V6euaZ0+AU0EvStXMJeI9 5KzTNZrs6SJAjMEAAEIAB0WIQToy4X3aHcFem4n93r2t4JPQmmgcwUCZuG0WAAKCRD2t4JPQmmg c7V2D/9TWXLNLbSixXiR1q79qX535CSD/cj9KCmk8nvWCY2a4ruQ3GawiDg6oNIVQ+MRj2aqZmX yW04e/Pb44t+1vTIik4ToE07aSHqTBcAHuPA5oQbbCvy4FfIEZyNMoBKt/L2PPO1BqbedOej7PF A0RSdpxGxIiCt5EZxkkZoUgiELIkdfdDPhl1ayvjeicPmhdWzP2sKtrY82pjPcHSEZ8zNVmqH3o ww9Lz6Fk8jc/VGutLx9zGQaTALGNi9uFWCS9UCrIHdb9FYvXcf3nGYfu8/At2NEF2HMgRWBEVlt n8gLaLJt13mpBOVkB7T9y9NwEKw5NMMGdGd9yx6DjxN8C0QFDvXPMm6ne52D8dQcoHgFGP3o8LX mtYjPuXA0NRuSW3M1XdlG7X+Tyu5ljxM5CMvQrPmdE4grqm5xLad9XIT+DpDWX+6nLGxalLAA7l TPx21Rer8Q1JmG0xAaz11/ylsTr+/aTHbsy4YKY8iuDG6rxl+jJIoIpdJz4OqfSf3sq3AzaRebd 1GnR39zp1fBbu8JhTtJYdO18QCvoLmimjXsXaQqzOAs7C5FCB0dWenTLGjQVsV05P0+hFyd8tGG 0ok1uPl51DuAwXMwk9g1iViCO6NL5gBkJJ1W68ERpLTv4Z2ytJH4xDCPo1LtRpcX72uOURjdvyN grvPyEeSAXS1DaQ== X-Developer-Key: i=matttbe@kernel.org; a=openpgp; fpr=E8CB85F76877057A6E27F77AF6B7824F4269A073 From: Geliang Tang This patch adds a subtest named test_subflow in test_mptcp to load and verify the newly added MPTCP subflow BPF program. To goal is to make sure it is possible to set different socket options per subflows, while the userspace socket interface only lets the application to set the same socket options for the whole MPTCP connection and its multiple subflows. To check that, a client and a server are started in a dedicated netns, with veth interfaces to simulate multiple paths. They will exchange data to allow the creation of an additional subflow. When the different subflows are being created, the new MPTCP subflow BPF program will set some socket options: marks and TCP CC. The validation is done by the same program, when the userspace checks the value of the modified socket options. On the userspace side, it will see that the default values are still being used on the MPTCP connection, while the BPF program will see different options set per subflow of the same MPTCP connection. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/76 Signed-off-by: Geliang Tang Reviewed-by: Mat Martineau Signed-off-by: Matthieu Baerts (NGI0) --- Notes: - v2 -> v3: - Use './mptcp_pm_nl_ctl' instead of 'ip mptcp', not supported by the BPF CI running IPRoute 5.5.0. - Use SYS_NOFAIL() in _ss_search() instead of calling system() - v3 -> v4: - Drop './mptcp_pm_nl_ctl', but skip this new test if 'ip mptcp' is not supported. - v4 -> v5: - Note that this new test is no longer skipped on the BPF CI, because 'ip mptcp' is now supported after the switch from Ubuntu 20.04 to 22.04. - Update the commit message, reflecting the latest version. - The validations are no longer done using 'ss', but using the new BPF program added in the previous patch, to reduce the use of external dependences. (Martin) - v5 -> v6: - Use usleep() instead of sleep(). --- tools/testing/selftests/bpf/prog_tests/mptcp.c | 127 +++++++++++++++++++++++++ 1 file changed, 127 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c index d2ca32fa3b21..c76a0d8c8f93 100644 --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -5,12 +5,17 @@ #include #include #include +#include #include "cgroup_helpers.h" #include "network_helpers.h" #include "mptcp_sock.skel.h" #include "mptcpify.skel.h" +#include "mptcp_subflow.skel.h" #define NS_TEST "mptcp_ns" +#define ADDR_1 "10.0.1.1" +#define ADDR_2 "10.0.1.2" +#define PORT_1 10001 #ifndef IPPROTO_MPTCP #define IPPROTO_MPTCP 262 @@ -335,10 +340,132 @@ static void test_mptcpify(void) close(cgroup_fd); } +static int endpoint_init(char *flags) +{ + SYS(fail, "ip -net %s link add veth1 type veth peer name veth2", NS_TEST); + SYS(fail, "ip -net %s addr add %s/24 dev veth1", NS_TEST, ADDR_1); + SYS(fail, "ip -net %s link set dev veth1 up", NS_TEST); + SYS(fail, "ip -net %s addr add %s/24 dev veth2", NS_TEST, ADDR_2); + SYS(fail, "ip -net %s link set dev veth2 up", NS_TEST); + if (SYS_NOFAIL("ip -net %s mptcp endpoint add %s %s", NS_TEST, ADDR_2, flags)) { + printf("'ip mptcp' not supported, skip this test.\n"); + test__skip(); + goto fail; + } + + return 0; +fail: + return -1; +} + +static void wait_for_new_subflows(int fd) +{ + socklen_t len; + u8 subflows; + int err, i; + + len = sizeof(subflows); + /* Wait max 1 sec for new subflows to be created */ + for (i = 0; i < 10; i++) { + err = getsockopt(fd, SOL_MPTCP, MPTCP_INFO, &subflows, &len); + if (!err && subflows > 0) + break; + + usleep(100000); /* 0.1s */ + } +} + +static void run_subflow(void) +{ + int server_fd, client_fd, err; + char new[TCP_CA_NAME_MAX]; + char cc[TCP_CA_NAME_MAX]; + unsigned int mark; + socklen_t len; + + server_fd = start_mptcp_server(AF_INET, ADDR_1, PORT_1, 0); + if (!ASSERT_OK_FD(server_fd, "start_mptcp_server")) + return; + + client_fd = connect_to_fd(server_fd, 0); + if (!ASSERT_OK_FD(client_fd, "connect_to_fd")) + goto close_server; + + send_byte(client_fd); + wait_for_new_subflows(client_fd); + + len = sizeof(mark); + err = getsockopt(client_fd, SOL_SOCKET, SO_MARK, &mark, &len); + if (ASSERT_OK(err, "getsockopt(client_fd, SO_MARK)")) + ASSERT_EQ(mark, 0, "mark"); + + len = sizeof(new); + err = getsockopt(client_fd, SOL_TCP, TCP_CONGESTION, new, &len); + if (ASSERT_OK(err, "getsockopt(client_fd, TCP_CONGESTION)")) { + get_msk_ca_name(cc); + ASSERT_STREQ(new, cc, "cc"); + } + + close(client_fd); +close_server: + close(server_fd); +} + +static void test_subflow(void) +{ + int cgroup_fd, prog_fd, err; + struct mptcp_subflow *skel; + struct nstoken *nstoken; + struct bpf_link *link; + + cgroup_fd = test__join_cgroup("/mptcp_subflow"); + if (!ASSERT_OK_FD(cgroup_fd, "join_cgroup: mptcp_subflow")) + return; + + skel = mptcp_subflow__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_open_load: mptcp_subflow")) + goto close_cgroup; + + skel->bss->pid = getpid(); + + err = mptcp_subflow__attach(skel); + if (!ASSERT_OK(err, "skel_attach: mptcp_subflow")) + goto skel_destroy; + + prog_fd = bpf_program__fd(skel->progs.mptcp_subflow); + err = bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_SOCK_OPS, 0); + if (!ASSERT_OK(err, "prog_attach")) + goto skel_destroy; + + nstoken = create_netns(); + if (!ASSERT_OK_PTR(nstoken, "create_netns: mptcp_subflow")) + goto skel_destroy; + + if (endpoint_init("subflow") < 0) + goto close_netns; + + link = bpf_program__attach_cgroup(skel->progs._getsockopt_subflow, + cgroup_fd); + if (!ASSERT_OK_PTR(link, "getsockopt prog")) + goto close_netns; + + run_subflow(); + + bpf_link__destroy(link); +close_netns: + cleanup_netns(nstoken); +skel_destroy: + mptcp_subflow__destroy(skel); +close_cgroup: + close(cgroup_fd); +} + void test_mptcp(void) { if (test__start_subtest("base")) test_base(); if (test__start_subtest("mptcpify")) test_mptcpify(); + if (test__start_subtest("subflow")) + test_subflow(); }