Move smoltcp-related code to bigtcp

kernel/libs/aster-bigtcp/src/errors.rs

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: MPL-2.0
+
+/// An error describing the reason why `bind` failed.
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum BindError {
+    /// All ephemeral ports is exhausted.
+    Exhausted,
+    /// The specified address is in use.
+    InUse,
+}
+
+pub mod tcp {
+    pub use smoltcp::socket::tcp::{ConnectError, ListenError, RecvError, SendError};
+}
+
+pub mod udp {
+    pub use smoltcp::socket::udp::{RecvError, SendError};
+}