diff options
| author | Breno Leitao <leitao@debian.org> | 2023-10-16 16:47:47 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-10-20 01:42:03 +0300 |
| commit | a5d2f99aff6b6f9cd6a1ab6907d8be8066114791 (patch) | |
| tree | fb1fb9b5d0b5b6afa0d15b6ea99343d0b665131c /io_uring | |
| parent | d2cac3ec823798861f8f39b4aa0ec960ffa997b0 (diff) | |
| download | linux-a5d2f99aff6b6f9cd6a1ab6907d8be8066114791.tar.xz | |
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 <leitao@debian.org>
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://lore.kernel.org/r/20231016134750.1381153-10-leitao@debian.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/uring_cmd.c | 28 |
1 files changed, 28 insertions, 0 deletions
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; } |