diff --git a/kernel/aster-nix/src/net/iface/any_socket.rs b/kernel/aster-nix/src/net/iface/any_socket.rs
index 95484f12..912c7e99 100644
--- a/kernel/aster-nix/src/net/iface/any_socket.rs
+++ b/kernel/aster-nix/src/net/iface/any_socket.rs
@@ -1,13 +1,10 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(dead_code)]
-
 use super::{Iface, IpAddress, IpEndpoint};
 use crate::{events::Observer, prelude::*};
 
 pub type RawTcpSocket = smoltcp::socket::tcp::Socket<'static>;
 pub type RawUdpSocket = smoltcp::socket::udp::Socket<'static>;
-pub type RawSocketHandle = smoltcp::iface::SocketHandle;
 
 pub struct AnyUnboundSocket {
     socket_family: AnyRawSocket,
diff --git a/kernel/aster-nix/src/net/iface/loopback.rs b/kernel/aster-nix/src/net/iface/loopback.rs
index ede3ff9c..3380bd54 100644
--- a/kernel/aster-nix/src/net/iface/loopback.rs
+++ b/kernel/aster-nix/src/net/iface/loopback.rs
@@ -1,9 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(unused_variables)]
-
 use smoltcp::{
-    iface::{Config, Routes},
+    iface::Config,
     phy::{Loopback, Medium},
     wire::IpCidr,
 };
@@ -27,7 +25,6 @@ impl IfaceLoopback {
     pub fn new() -> Arc<Self> {
         let mut loopback = Loopback::new(Medium::Ip);
         let interface = {
-            let routes = Routes::new();
             let config = Config::new();
             let mut interface = smoltcp::iface::Interface::new(config, &mut loopback);
             interface.update_ip_addrs(|ip_addrs| {
diff --git a/kernel/aster-nix/src/net/iface/virtio.rs b/kernel/aster-nix/src/net/iface/virtio.rs
index 56e21091..1c4e1bd9 100644
--- a/kernel/aster-nix/src/net/iface/virtio.rs
+++ b/kernel/aster-nix/src/net/iface/virtio.rs
@@ -1,11 +1,9 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(unused_variables)]
-
 use aster_network::AnyNetworkDevice;
 use aster_virtio::device::network::DEVICE_NAME;
 use smoltcp::{
-    iface::{Config, Routes, SocketHandle, SocketSet},
+    iface::{Config, SocketHandle, SocketSet},
     socket::dhcpv4,
     wire::{self, IpCidr},
 };
@@ -26,7 +24,6 @@ impl IfaceVirtio {
         let interface = {
             let mac_addr = virtio_net.lock().mac_addr();
             let ip_addr = IpCidr::new(wire::IpAddress::Ipv4(wire::Ipv4Address::UNSPECIFIED), 0);
-            let routes = Routes::new();
             let config = {
                 let mut config = Config::new();
                 config.hardware_addr = Some(wire::HardwareAddress::Ethernet(
diff --git a/kernel/aster-nix/src/net/socket/ip/datagram/bound.rs b/kernel/aster-nix/src/net/socket/ip/datagram/bound.rs
index f246f5ad..4fc9f4bf 100644
--- a/kernel/aster-nix/src/net/socket/ip/datagram/bound.rs
+++ b/kernel/aster-nix/src/net/socket/ip/datagram/bound.rs
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(unused_variables)]
-
 use smoltcp::socket::udp::{RecvError, SendError};
 
 use crate::{
@@ -39,7 +37,7 @@ impl BoundDatagram {
         self.remote_endpoint = Some(*endpoint)
     }
 
-    pub fn try_recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, IpEndpoint)> {
+    pub fn try_recv(&self, buf: &mut [u8], _flags: SendRecvFlags) -> Result<(usize, IpEndpoint)> {
         let result = self
             .bound_socket
             .raw_with(|socket: &mut RawUdpSocket| socket.recv_slice(buf));
@@ -51,7 +49,12 @@ impl BoundDatagram {
         }
     }
 
-    pub fn try_send(&self, buf: &[u8], remote: &IpEndpoint, flags: SendRecvFlags) -> Result<usize> {
+    pub fn try_send(
+        &self,
+        buf: &[u8],
+        remote: &IpEndpoint,
+        _flags: SendRecvFlags,
+    ) -> Result<usize> {
         let result = self.bound_socket.raw_with(|socket: &mut RawUdpSocket| {
             if socket.payload_send_capacity() < buf.len() {
                 return None;
diff --git a/kernel/aster-nix/src/net/socket/ip/datagram/mod.rs b/kernel/aster-nix/src/net/socket/ip/datagram/mod.rs
index 0e6e21f1..7cca30f4 100644
--- a/kernel/aster-nix/src/net/socket/ip/datagram/mod.rs
+++ b/kernel/aster-nix/src/net/socket/ip/datagram/mod.rs
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(unused_variables)]
-
 use core::sync::atomic::{AtomicBool, Ordering};
 
 use takeable::Takeable;
@@ -301,7 +299,7 @@ impl Socket for DatagramSocket {
     fn addr(&self) -> Result<SocketAddr> {
         let inner = self.inner.read();
         match inner.as_ref() {
-            Inner::Unbound(unbound_datagram) => Ok(UNSPECIFIED_LOCAL_ENDPOINT.into()),
+            Inner::Unbound(_) => Ok(UNSPECIFIED_LOCAL_ENDPOINT.into()),
             Inner::Bound(bound_datagram) => Ok(bound_datagram.local_endpoint().into()),
         }
     }
@@ -373,7 +371,7 @@ impl Socket for DatagramSocket {
 }
 
 impl Observer<()> for DatagramSocket {
-    fn on_events(&self, events: &()) {
+    fn on_events(&self, _events: &()) {
         self.update_io_events();
     }
 }
diff --git a/kernel/aster-nix/src/net/socket/ip/stream/connected.rs b/kernel/aster-nix/src/net/socket/ip/stream/connected.rs
index 0887fb81..afb4527c 100644
--- a/kernel/aster-nix/src/net/socket/ip/stream/connected.rs
+++ b/kernel/aster-nix/src/net/socket/ip/stream/connected.rs
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(unused_variables)]
-
 use alloc::sync::Weak;
 
 use smoltcp::socket::tcp::{RecvError, SendError};
@@ -45,7 +43,7 @@ impl ConnectedStream {
         }
     }
 
-    pub fn shutdown(&self, cmd: SockShutdownCmd) -> Result<()> {
+    pub fn shutdown(&self, _cmd: SockShutdownCmd) -> Result<()> {
         // TODO: deal with cmd
         self.bound_socket.raw_with(|socket: &mut RawTcpSocket| {
             socket.close();
@@ -53,7 +51,7 @@ impl ConnectedStream {
         Ok(())
     }
 
-    pub fn try_recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<usize> {
+    pub fn try_recv(&self, buf: &mut [u8], _flags: SendRecvFlags) -> Result<usize> {
         let result = self
             .bound_socket
             .raw_with(|socket: &mut RawTcpSocket| socket.recv_slice(buf));
@@ -68,7 +66,7 @@ impl ConnectedStream {
         }
     }
 
-    pub fn try_send(&self, buf: &[u8], flags: SendRecvFlags) -> Result<usize> {
+    pub fn try_send(&self, buf: &[u8], _flags: SendRecvFlags) -> Result<usize> {
         let result = self
             .bound_socket
             .raw_with(|socket: &mut RawTcpSocket| socket.send_slice(buf));
diff --git a/kernel/aster-nix/src/net/socket/ip/stream/listen.rs b/kernel/aster-nix/src/net/socket/ip/stream/listen.rs
index c5389ba7..ef63ce15 100644
--- a/kernel/aster-nix/src/net/socket/ip/stream/listen.rs
+++ b/kernel/aster-nix/src/net/socket/ip/stream/listen.rs
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(unused_variables)]
-
 use smoltcp::socket::tcp::ListenError;
 
 use super::connected::ConnectedStream;
@@ -66,9 +64,8 @@ impl ListenStream {
             })?;
         let active_backlog_socket = backlog_sockets.remove(index);
 
-        match BacklogSocket::new(&self.bound_socket) {
-            Ok(backlog_socket) => backlog_sockets.push(backlog_socket),
-            Err(err) => (),
+        if let Ok(backlog_socket) = BacklogSocket::new(&self.bound_socket) {
+            backlog_sockets.push(backlog_socket);
         }
 
         let remote_endpoint = active_backlog_socket.remote_endpoint().unwrap();
diff --git a/kernel/aster-nix/src/net/socket/ip/stream/mod.rs b/kernel/aster-nix/src/net/socket/ip/stream/mod.rs
index b106f7e6..c6c9e80d 100644
--- a/kernel/aster-nix/src/net/socket/ip/stream/mod.rs
+++ b/kernel/aster-nix/src/net/socket/ip/stream/mod.rs
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(unused_variables)]
-
 use core::sync::atomic::{AtomicBool, Ordering};
 
 use connected::ConnectedStream;
@@ -713,7 +711,7 @@ impl Socket for StreamSocket {
 }
 
 impl Observer<()> for StreamSocket {
-    fn on_events(&self, events: &()) {
+    fn on_events(&self, _events: &()) {
         let conn_ready = self.update_io_events();
 
         if conn_ready {
diff --git a/kernel/aster-nix/src/net/socket/mod.rs b/kernel/aster-nix/src/net/socket/mod.rs
index 6fcd8247..d3f23bdc 100644
--- a/kernel/aster-nix/src/net/socket/mod.rs
+++ b/kernel/aster-nix/src/net/socket/mod.rs
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(unused_variables)]
-
 use self::options::SocketOption;
 pub use self::util::{
     options::LingerOption, send_recv_flags::SendRecvFlags, shutdown_cmd::SockShutdownCmd,
@@ -18,17 +16,17 @@ pub mod vsock;
 /// Operations defined on a socket.
 pub trait Socket: FileLike + Send + Sync {
     /// Assign the address specified by socket_addr to the socket
-    fn bind(&self, socket_addr: SocketAddr) -> Result<()> {
+    fn bind(&self, _socket_addr: SocketAddr) -> Result<()> {
         return_errno_with_message!(Errno::EOPNOTSUPP, "bind() is not supported");
     }
 
     /// Build connection for a given address
-    fn connect(&self, socket_addr: SocketAddr) -> Result<()> {
+    fn connect(&self, _socket_addr: SocketAddr) -> Result<()> {
         return_errno_with_message!(Errno::EOPNOTSUPP, "connect() is not supported");
     }
 
     /// Listen for connections on a socket
-    fn listen(&self, backlog: usize) -> Result<()> {
+    fn listen(&self, _backlog: usize) -> Result<()> {
         return_errno_with_message!(Errno::EOPNOTSUPP, "listen() is not supported");
     }
 
@@ -38,7 +36,7 @@ pub trait Socket: FileLike + Send + Sync {
     }
 
     /// Shut down part of a full-duplex connection
-    fn shutdown(&self, cmd: SockShutdownCmd) -> Result<()> {
+    fn shutdown(&self, _cmd: SockShutdownCmd) -> Result<()> {
         return_errno_with_message!(Errno::EOPNOTSUPP, "shutdown() is not supported");
     }
 
@@ -54,12 +52,12 @@ pub trait Socket: FileLike + Send + Sync {
 
     /// Get options on the socket. The resulted option will put in the `option` parameter, if
     /// this method returns success.
-    fn get_option(&self, option: &mut dyn SocketOption) -> Result<()> {
+    fn get_option(&self, _option: &mut dyn SocketOption) -> Result<()> {
         return_errno_with_message!(Errno::EOPNOTSUPP, "getsockopt() is not supported");
     }
 
     /// Set options on the socket.
-    fn set_option(&self, option: &dyn SocketOption) -> Result<()> {
+    fn set_option(&self, _option: &dyn SocketOption) -> Result<()> {
         return_errno_with_message!(Errno::EOPNOTSUPP, "setsockopt() is not supported");
     }
 
diff --git a/kernel/aster-nix/src/net/socket/unix/stream/connected.rs b/kernel/aster-nix/src/net/socket/unix/stream/connected.rs
index 21c84816..44ab5e43 100644
--- a/kernel/aster-nix/src/net/socket/unix/stream/connected.rs
+++ b/kernel/aster-nix/src/net/socket/unix/stream/connected.rs
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(dead_code)]
-
 use super::endpoint::Endpoint;
 use crate::{
     events::IoEvents,
@@ -27,10 +25,6 @@ impl Connected {
         self.local_endpoint.peer_addr()
     }
 
-    pub(super) fn is_bound(&self) -> bool {
-        self.addr().is_some()
-    }
-
     pub(super) fn write(&self, buf: &[u8]) -> Result<usize> {
         self.local_endpoint.write(buf)
     }
diff --git a/kernel/aster-nix/src/net/socket/unix/stream/endpoint.rs b/kernel/aster-nix/src/net/socket/unix/stream/endpoint.rs
index 94b04bf2..04970935 100644
--- a/kernel/aster-nix/src/net/socket/unix/stream/endpoint.rs
+++ b/kernel/aster-nix/src/net/socket/unix/stream/endpoint.rs
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(unused_variables)]
-
 use crate::{
     events::IoEvents,
     fs::utils::{Channel, Consumer, Producer, StatusFlags},
diff --git a/kernel/aster-nix/src/net/socket/unix/stream/init.rs b/kernel/aster-nix/src/net/socket/unix/stream/init.rs
index cd2fd01b..3f73a886 100644
--- a/kernel/aster-nix/src/net/socket/unix/stream/init.rs
+++ b/kernel/aster-nix/src/net/socket/unix/stream/init.rs
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(dead_code)]
-
 use core::sync::atomic::{AtomicBool, Ordering};
 
 use super::{connected::Connected, endpoint::Endpoint, listener::push_incoming};
@@ -69,10 +67,6 @@ impl Init {
         Ok(Connected::new(this_end))
     }
 
-    pub(super) fn is_bound(&self) -> bool {
-        self.addr.lock().is_some()
-    }
-
     pub(super) fn addr(&self) -> Option<UnixSocketAddrBound> {
         self.addr.lock().clone()
     }
diff --git a/kernel/aster-nix/src/net/socket/unix/stream/socket.rs b/kernel/aster-nix/src/net/socket/unix/stream/socket.rs
index 58514f02..d4ba273b 100644
--- a/kernel/aster-nix/src/net/socket/unix/stream/socket.rs
+++ b/kernel/aster-nix/src/net/socket/unix/stream/socket.rs
@@ -1,8 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(dead_code)]
-#![allow(unused_variables)]
-
 use super::{
     connected::Connected,
     endpoint::Endpoint,
@@ -37,10 +34,6 @@ impl UnixStreamSocket {
         Self(RwLock::new(State::Init(Arc::new(init))))
     }
 
-    pub(super) fn new_listen(listen: Listener) -> Self {
-        Self(RwLock::new(State::Listen(Arc::new(listen))))
-    }
-
     pub(super) fn new_connected(connected: Connected) -> Self {
         Self(RwLock::new(State::Connected(Arc::new(connected))))
     }
@@ -91,7 +84,7 @@ impl UnixStreamSocket {
         status_flags.intersection(SUPPORTED_FLAGS)
     }
 
-    fn send(&self, buf: &[u8], flags: SendRecvFlags) -> Result<usize> {
+    fn send(&self, buf: &[u8], _flags: SendRecvFlags) -> Result<usize> {
         let connected = match &*self.0.read() {
             State::Connected(connected) => connected.clone(),
             _ => return_errno_with_message!(Errno::ENOTCONN, "the socket is not connected"),
@@ -100,7 +93,7 @@ impl UnixStreamSocket {
         connected.write(buf)
     }
 
-    fn recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<usize> {
+    fn recv(&self, buf: &mut [u8], _flags: SendRecvFlags) -> Result<usize> {
         let connected = match &*self.0.read() {
             State::Connected(connected) => connected.clone(),
             _ => return_errno_with_message!(Errno::ENOTCONN, "the socket is not connected"),
diff --git a/kernel/aster-nix/src/net/socket/util/message_header.rs b/kernel/aster-nix/src/net/socket/util/message_header.rs
index 1a018415..278a088b 100644
--- a/kernel/aster-nix/src/net/socket/util/message_header.rs
+++ b/kernel/aster-nix/src/net/socket/util/message_header.rs
@@ -47,7 +47,7 @@ pub fn copy_message_from_user(io_vecs: &[IoVec]) -> Box<[u8]> {
         // FIXME: short read should be allowed here
         match io_vec.read_exact_from_user(dst) {
             Ok(()) => total_bytes += io_vec.len(),
-            Err(e) => {
+            Err(_) => {
                 warn!("fails to copy message from user");
                 break;
             }
@@ -84,7 +84,7 @@ pub fn copy_message_to_user(io_vecs: &[IoVec], message: &[u8]) -> usize {
         let src = &message[total_bytes..total_bytes + len];
         match io_vec.write_to_user(src) {
             Ok(len) => total_bytes += len,
-            Err(e) => {
+            Err(_) => {
                 warn!("fails to copy message to user");
                 break;
             }
diff --git a/kernel/aster-nix/src/net/socket/util/options.rs b/kernel/aster-nix/src/net/socket/util/options.rs
index b9e7d130..023c080d 100644
--- a/kernel/aster-nix/src/net/socket/util/options.rs
+++ b/kernel/aster-nix/src/net/socket/util/options.rs
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: MPL-2.0
 
-#![allow(dead_code)]
-
 use core::time::Duration;
 
 use crate::{
@@ -19,7 +17,6 @@ pub struct SocketOptionSet {
     send_buf: u32,
     recv_buf: u32,
     linger: LingerOption,
-    keep_alive: bool,
 }
 
 impl SocketOptionSet {
@@ -32,7 +29,6 @@ impl SocketOptionSet {
             send_buf: SEND_BUF_LEN as u32,
             recv_buf: RECV_BUF_LEN as u32,
             linger: LingerOption::default(),
-            keep_alive: false,
         }
     }
 }
diff --git a/kernel/aster-nix/src/net/socket/vsock/common.rs b/kernel/aster-nix/src/net/socket/vsock/common.rs
index a0d216e5..f55bf236 100644
--- a/kernel/aster-nix/src/net/socket/vsock/common.rs
+++ b/kernel/aster-nix/src/net/socket/vsock/common.rs
@@ -198,7 +198,6 @@ impl VsockSpace {
     /// Poll for each event from the driver
     pub fn poll(&self) -> Result<()> {
         let mut driver = self.driver.lock_irq_disabled();
-        let guest_cid = driver.guest_cid() as u32;
 
         while let Some(event) = self.poll_single(&mut driver)? {
             if !self.is_event_for_socket(&event) {
@@ -249,14 +248,14 @@ impl VsockSpace {
                     connecting.update_info(&event);
                     connecting.add_events(IoEvents::IN);
                 }
-                VsockEventType::Disconnected { reason } => {
+                VsockEventType::Disconnected { .. } => {
                     let connected_sockets = self.connected_sockets.read_irq_disabled();
                     let Some(connected) = connected_sockets.get(&event.into()) else {
                         return_errno_with_message!(Errno::ENOTCONN, "the socket hasn't connected");
                     };
                     connected.set_peer_requested_shutdown();
                 }
-                VsockEventType::Received { length } => {}
+                VsockEventType::Received { .. } => {}
                 VsockEventType::CreditRequest => {
                     let connected_sockets = self.connected_sockets.read_irq_disabled();
                     let Some(connected) = connected_sockets.get(&event.into()) else {
@@ -282,7 +281,7 @@ impl VsockSpace {
         driver
             .poll(|event, body| {
                 // Deal with Received before the buffer are recycled.
-                if let VsockEventType::Received { length } = event.event_type {
+                if let VsockEventType::Received { .. } = event.event_type {
                     // Only consider the connected socket and copy body to buffer
                     let connected_sockets = self.connected_sockets.read_irq_disabled();
                     let connected = connected_sockets.get(&event.into()).unwrap();
@@ -294,6 +293,6 @@ impl VsockSpace {
                 }
                 Ok(Some(event))
             })
-            .map_err(|e| Error::with_message(Errno::EIO, "driver poll failed"))
+            .map_err(|_| Error::with_message(Errno::EIO, "driver poll failed"))
     }
 }
diff --git a/kernel/aster-nix/src/net/socket/vsock/stream/connected.rs b/kernel/aster-nix/src/net/socket/vsock/stream/connected.rs
index 11a12c73..005f7f0f 100644
--- a/kernel/aster-nix/src/net/socket/vsock/stream/connected.rs
+++ b/kernel/aster-nix/src/net/socket/vsock/stream/connected.rs
@@ -92,7 +92,7 @@ impl Connected {
         connection.is_local_shutdown()
     }
 
-    pub fn shutdown(&self, cmd: SockShutdownCmd) -> Result<()> {
+    pub fn shutdown(&self, _cmd: SockShutdownCmd) -> Result<()> {
         // TODO: deal with cmd
         if self.should_close() {
             let mut connection = self.connection.lock_irq_disabled();
diff --git a/kernel/aster-nix/src/net/socket/vsock/stream/socket.rs b/kernel/aster-nix/src/net/socket/vsock/stream/socket.rs
index 869a97b9..37e72f4d 100644
--- a/kernel/aster-nix/src/net/socket/vsock/stream/socket.rs
+++ b/kernel/aster-nix/src/net/socket/vsock/stream/socket.rs
@@ -124,7 +124,7 @@ impl VsockStreamSocket {
         }
     }
 
-    fn try_recv(&self, buf: &mut [u8], flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
+    fn try_recv(&self, buf: &mut [u8], _flags: SendRecvFlags) -> Result<(usize, SocketAddr)> {
         let connected = match &*self.status.read() {
             Status::Connected(connected) => connected.clone(),
             Status::Init(_) | Status::Listen(_) => {
@@ -162,14 +162,12 @@ impl FileLike for VsockStreamSocket {
 
     fn read(&self, buf: &mut [u8]) -> Result<usize> {
         // TODO: Set correct flags
-        let flags = SendRecvFlags::empty();
         self.recv(buf, SendRecvFlags::empty()).map(|(len, _)| len)
     }
 
     fn write(&self, buf: &[u8]) -> Result<usize> {
         // TODO: Set correct flags
-        let flags = SendRecvFlags::empty();
-        self.send(buf, flags)
+        self.send(buf, SendRecvFlags::empty())
     }
 
     fn poll(&self, mask: IoEvents, poller: Option<&Poller>) -> IoEvents {