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. On the other hand, SOCKET_URING_OP_GETSOCKOPT just implements level SOL_SOCKET case, which seems to be the most common level parameter for get/setsockopt(2). struct proto_ops->setsockopt() uses sockptr instead of userspace pointers, which makes it easy to bind to io_uring. Unfortunately proto_ops->getsockopt() callback uses userspace pointers, except for SOL_SOCKET, which is handled by sk_getsockopt(). Thus, this patchset leverages sk_getsockopt() to implement the SOCKET_URING_OP_GETSOCKOPT case. 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. This patch was tested with a new test[1] in liburing. This patch depends on "io_uring: Add io_uring command support for sockets"[2] [1] Link: https://github.com/leitao/liburing/blob/getsock/test/socket-getsetsock-cmd.c [2] Link: https://lore.kernel.org/all/20230627134424.2784797-1-leitao@xxxxxxxxxx/ Changes from RFC: * Copy user memory at io_uring subsystem, and call proto_ops callbacks using kernel memory * Implement all the cases for SOCKET_URING_OP_SETSOCKOPT Breno Leitao (4): net: expose sock_use_custom_sol_socket io_uring/cmd: Introduce SOCKET_URING_OP_GETSOCKOPT io_uring/cmd: Introduce SOCKET_URING_OP_SETSOCKOPT io_uring/cmd: Extend support beyond SOL_SOCKET include/linux/net.h | 5 +++ include/uapi/linux/io_uring.h | 8 ++++ io_uring/uring_cmd.c | 81 +++++++++++++++++++++++++++++++++++ net/socket.c | 5 --- 4 files changed, 94 insertions(+), 5 deletions(-) -- 2.34.1
