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[2a03:2880:31ff:74::face:b00c]) by smtp.gmail.com with ESMTPSA id bm26-20020a0564020b1a00b005288f0e547esm6075885edb.55.2023.09.04.09.25.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Sep 2023 09:25:18 -0700 (PDT) From: Breno Leitao To: sdf@google.com, axboe@kernel.dk, asml.silence@gmail.com, willemdebruijn.kernel@gmail.com, martin.lau@linux.dev, krisman@suse.de Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, io-uring@vger.kernel.org, kuba@kernel.org, pabeni@redhat.com Subject: [PATCH v4 00/10] io_uring: Initial support for {s,g}etsockopt commands Date: Mon, 4 Sep 2023 09:24:53 -0700 Message-Id: <20230904162504.1356068-1-leitao@debian.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This patchset adds support for getsockopt (SOCKET_URING_OP_GETSOCKOPT) and setsockopt (SOCKET_URING_OP_SETSOCKOPT) in io_uring commands. SOCKET_URING_OP_SETSOCKOPT implements generic case, covering all levels and optnames. SOCKET_URING_OP_GETSOCKOPT is limited, for now, to SOL_SOCKET level, which seems to be the most common level parameter for get/setsockopt(2). In order to keep the implementation (and tests) simple, some refactors were done prior to the changes, as follows: Patches 1-2: Modify the BPF hooks to support sockptr_t, so, these functions become flexible enough to accept user or kernel pointers for optval/optlen. Patch 3-4: Remove the core {s,g}etsockopt() core function from __sys_{g,s}etsockopt, so, the code could be reused by other callers, such as io_uring. Patch 5: Pass compat mode to the file/socket callbacks Patch 6: Move io_uring helpers from io_uring_zerocopy_tx to a generic io_uring headers. This simplify the test case (last patch) Patch 7: Protect io_uring_cmd_sock() to not be called if CONFIG_NET is disabled. PS1: For getsockopt command, the optlen field is not a userspace pointers, but an absolute value, so this is slightly different from getsockopt(2) behaviour. The new optlen value is returned in cqe->res. PS2: The userspace pointers need to be alive until the operation is completed. These changes were tested with a new test[1] in liburing, LTP sockopt* tests, as also with bpf/progs/sockopt test case, which is now adapted to run using both system calls and io_uring commands. [1] Link: https://github.com/leitao/liburing/blob/getsockopt/test/socket-getsetsock-cmd.c RFC -> V1: * Copy user memory at io_uring subsystem, and call proto_ops callbacks using kernel memory * Implement all the cases for SOCKET_URING_OP_SETSOCKOPT V1 -> V2 * Implemented the BPF part * Using user pointers from optval to avoid kmalloc in io_uring part. V2 -> V3: * Break down __sys_setsockopt and reuse the core code, avoiding duplicated code. This removed the requirement to expose sock_use_custom_sol_socket(). * Added io_uring test to selftests/bpf/sockopt. * Fixed compat argument, by passing it to the issue_flags. V3 -> V4: * Rebase on top of commit 1ded5e5a5931b ("net: annotate data-races around sock->ops") * Also broke down __sys_setsockopt() to reuse the core function from io_uring. * Create a new patch to return -EOPNOTSUPP if CONFIG_NET is disabled * Added two SOL_SOCKET tests in bpf/prog_tests/sockopt.c Breno Leitao (10): bpf: Leverage sockptr_t in BPF getsockopt hook bpf: Leverage sockptr_t in BPF setsockopt hook net/socket: Break down __sys_setsockopt net/socket: Break down __sys_getsockopt io_uring/cmd: Pass compat mode in issue_flags selftests/net: Extract uring helpers to be reusable io_uring/cmd: return -EOPNOTSUPP if net is disabled io_uring/cmd: Introduce SOCKET_URING_OP_GETSOCKOPT io_uring/cmd: Introduce SOCKET_URING_OP_SETSOCKOPT selftests/bpf/sockopt: Add io_uring support include/linux/bpf-cgroup.h | 9 +- include/linux/io_uring.h | 1 + include/net/sock.h | 4 + include/uapi/linux/io_uring.h | 8 + io_uring/uring_cmd.c | 55 ++++ kernel/bpf/cgroup.c | 25 +- net/core/sock.c | 8 - net/socket.c | 102 ++++--- tools/include/io_uring/mini_liburing.h | 282 ++++++++++++++++++ .../selftests/bpf/prog_tests/sockopt.c | 113 ++++++- tools/testing/selftests/net/Makefile | 1 + .../selftests/net/io_uring_zerocopy_tx.c | 268 +---------------- 12 files changed, 544 insertions(+), 332 deletions(-) create mode 100644 tools/include/io_uring/mini_liburing.h -- 2.34.1