From a5d2f99aff6b6f9cd6a1ab6907d8be8066114791 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Mon, 16 Oct 2023 06:47:47 -0700 Subject: io_uring/cmd: Introduce SOCKET_URING_OP_GETSOCKOPT Add support for getsockopt command (SOCKET_URING_OP_GETSOCKOPT), where level is SOL_SOCKET. This is leveraging the sockptr_t infrastructure, where a sockptr_t is either userspace or kernel space, and handled as such. Differently from the getsockopt(2), the optlen field is not a userspace pointers. In getsockopt(2), userspace provides optlen pointer, which is overwritten by the kernel. In this implementation, userspace passes a u32, and the new value is returned in cqe->res. I.e., optlen is not a pointer. Important to say that userspace needs to keep the pointer alive until the CQE is completed. Signed-off-by: Breno Leitao Reviewed-by: Gabriel Krisman Bertazi Link: https://lore.kernel.org/r/20231016134750.1381153-10-leitao@debian.org Signed-off-by: Jens Axboe --- io_uring/uring_cmd.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'io_uring') diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index 42694c07d8fd..8b045830b0d9 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -214,6 +214,32 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, } EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed); +static inline int io_uring_cmd_getsockopt(struct socket *sock, + struct io_uring_cmd *cmd, + unsigned int issue_flags) +{ + bool compat = !!(issue_flags & IO_URING_F_COMPAT); + int optlen, optname, level, err; + void __user *optval; + + level = READ_ONCE(cmd->sqe->level); + if (level != SOL_SOCKET) + return -EOPNOTSUPP; + + optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval)); + optname = READ_ONCE(cmd->sqe->optname); + optlen = READ_ONCE(cmd->sqe->optlen); + + err = do_sock_getsockopt(sock, compat, level, optname, + USER_SOCKPTR(optval), + KERNEL_SOCKPTR(&optlen)); + if (err) + return err; + + /* On success, return optlen */ + return optlen; +} + #if defined(CONFIG_NET) int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags) { @@ -236,6 +262,8 @@ int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags) if (ret) return ret; return arg; + case SOCKET_URING_OP_GETSOCKOPT: + return io_uring_cmd_getsockopt(sock, cmd, issue_flags); default: return -EOPNOTSUPP; } -- cgit v1.2.3