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authorBreno Leitao <leitao@debian.org>2023-10-16 16:47:47 +0300
committerJens Axboe <axboe@kernel.dk>2023-10-20 01:42:03 +0300
commita5d2f99aff6b6f9cd6a1ab6907d8be8066114791 (patch)
treefb1fb9b5d0b5b6afa0d15b6ea99343d0b665131c /io_uring
parentd2cac3ec823798861f8f39b4aa0ec960ffa997b0 (diff)
downloadlinux-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.c28
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;
}