Set keepalive and tcp_nodelay on underlying sockets

kernel/libs/aster-bigtcp/src/socket/bound.rs

@@ -10,12 +10,13 @@ use ostd::sync::{LocalIrqDisabled, RwLock, SpinLock, SpinLockGuard, WriteIrqDisa
 use smoltcp::{
     iface::Context,
     socket::{tcp::State, udp::UdpMetadata, PollAt},
-    time::Instant,
+    time::{Duration, Instant},
     wire::{IpAddress, IpEndpoint, IpRepr, TcpControl, TcpRepr, UdpRepr},
 };
 
 use super::{
     event::{SocketEventObserver, SocketEvents},
+    option::RawTcpSetOption,
     RawTcpSocket, RawUdpSocket, TcpStateCheck,
 };
 use crate::{ext::Ext, iface::Iface};
@@ -251,6 +252,7 @@ pub enum ConnectState {
 pub struct NeedIfacePoll(bool);
 
 impl NeedIfacePoll {
+    pub const TRUE: Self = Self(true);
     pub const FALSE: Self = Self(false);
 }
 
@@ -371,6 +373,25 @@ impl<E: Ext> BoundTcpSocket<E> {
     }
 }
 
+impl<E: Ext> RawTcpSetOption for BoundTcpSocket<E> {
+    fn set_keep_alive(&mut self, interval: Option<Duration>) -> NeedIfacePoll {
+        let mut socket = self.0.socket.lock();
+        socket.set_keep_alive(interval);
+
+        if interval.is_some() {
+            self.0.update_next_poll_at_ms(PollAt::Now);
+            NeedIfacePoll::TRUE
+        } else {
+            NeedIfacePoll::FALSE
+        }
+    }
+
+    fn set_nagle_enabled(&mut self, enabled: bool) {
+        let mut socket = self.0.socket.lock();
+        socket.set_nagle_enabled(enabled);
+    }
+}
+
 impl<E: Ext> BoundUdpSocket<E> {
     /// Binds to a specified endpoint.
     ///

kernel/libs/aster-bigtcp/src/socket/mod.rs

@@ -2,13 +2,15 @@
 
 mod bound;
 mod event;
+mod option;
 mod state;
 mod unbound;
 
 pub use bound::{BoundTcpSocket, BoundUdpSocket, ConnectState, NeedIfacePoll};
 pub(crate) use bound::{BoundTcpSocketInner, BoundUdpSocketInner, TcpProcessResult};
 pub use event::{SocketEventObserver, SocketEvents};
-pub use state::TcpStateCheck;
+pub use option::RawTcpSetOption;
+pub use state::{TcpState, TcpStateCheck};
 pub use unbound::{
     UnboundTcpSocket, UnboundUdpSocket, TCP_RECV_BUF_LEN, TCP_SEND_BUF_LEN, UDP_RECV_PAYLOAD_LEN,
     UDP_SEND_PAYLOAD_LEN,

kernel/libs/aster-bigtcp/src/socket/option.rs

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: MPL-2.0
+
+use smoltcp::time::Duration;
+
+use super::NeedIfacePoll;
+
+/// A trait defines setting socket options on a raw socket.
+///
+/// TODO: When `UnboundSocket` is removed, all methods in this trait can accept
+/// `&self` instead of `&mut self` as parameter.
+pub trait RawTcpSetOption {
+    /// Sets the keep alive interval.
+    ///
+    /// Polling the iface _may_ be required after this method succeeds.
+    fn set_keep_alive(&mut self, interval: Option<Duration>) -> NeedIfacePoll;
+
+    /// Enables or disables Nagle’s Algorithm.
+    ///
+    /// Polling the iface is not required after this method succeeds.
+    fn set_nagle_enabled(&mut self, enabled: bool);
+}

kernel/libs/aster-bigtcp/src/socket/state.rs

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MPL-2.0
 
-use smoltcp::socket::tcp::State as TcpState;
+pub use smoltcp::socket::tcp::State as TcpState;
 
 use super::RawTcpSocket;
 

kernel/libs/aster-bigtcp/src/socket/unbound.rs

@@ -2,7 +2,7 @@
 
 use alloc::{boxed::Box, vec};
 
-use super::{RawTcpSocket, RawUdpSocket};
+use super::{option::RawTcpSetOption, NeedIfacePoll, RawTcpSocket, RawUdpSocket};
 
 pub struct UnboundSocket<T> {
     socket: Box<T>,
@@ -30,6 +30,17 @@ impl Default for UnboundTcpSocket {
     }
 }
 
+impl RawTcpSetOption for UnboundTcpSocket {
+    fn set_keep_alive(&mut self, interval: Option<smoltcp::time::Duration>) -> NeedIfacePoll {
+        self.socket.set_keep_alive(interval);
+        NeedIfacePoll::FALSE
+    }
+
+    fn set_nagle_enabled(&mut self, enabled: bool) {
+        self.socket.set_nagle_enabled(enabled);
+    }
+}
+
 impl UnboundUdpSocket {
     pub fn new() -> Self {
         let raw_udp_socket = {