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Merged
fslongjin merged 1 commit into from
Jan 8, 2026
Merged

feat(tcp): add getter methods for TCP socket metrics #3

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44 changes: 44 additions & 0 deletions src/socket/tcp.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -683,6 +683,50 @@ impl<'a> Socket<'a> {
self.nagle
}

pub fn remote_mss(&self) -> usize {
self.remote_mss
}

pub fn remote_win_len(&self) -> usize {
self.remote_win_len
}

pub fn remote_win_scale(&self) -> Option<u8> {
self.remote_win_scale
}

pub fn rtt(&self) -> u32 {
self.rtte.rtt
}

pub fn rtt_var(&self) -> u32 {
self.rtte.deviation
}

pub fn rto(&self) -> Duration {
self.rtte.retransmission_timeout()
}

pub fn retransmits(&self) -> u8 {
self.rtte.rto_count
}

pub fn cwnd(&self) -> usize {
self.congestion_controller.cwnd()
}

pub fn ssthresh(&self) -> usize {
self.congestion_controller.ssthresh()
}

pub fn local_seq_no(&self) -> TcpSeqNumber {
self.local_seq_no
}

pub fn remote_last_ack(&self) -> Option<TcpSeqNumber> {
self.remote_last_ack
}

/// Return the current window field value, including scaling according to RFC 1323.
///
/// Used in internal calculations as well as packet generation.
Expand Down
16 changes: 16 additions & 0 deletions src/socket/tcp/congestion.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,12 @@ pub(super) trait Controller {

/// Set the maximum segment size.
fn set_mss(&mut self, mss: usize) {}

/// Returns the current congestion window size.
fn cwnd(&self) -> usize;

/// Returns the current slow start threshold.
fn ssthresh(&self) -> usize;
}

#[derive(Debug)]
Expand Down Expand Up @@ -73,6 +79,16 @@ impl AnyController {
AnyController::None(no_control::NoControl)
}

#[inline]
pub fn cwnd(&self) -> usize {
self.inner().cwnd()
}

#[inline]
pub fn ssthresh(&self) -> usize {
self.inner().ssthresh()
}

#[inline]
pub fn inner_mut(&mut self) -> &mut dyn Controller {
match self {
Expand Down
8 changes: 8 additions & 0 deletions src/socket/tcp/congestion/cubic.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,14 @@ impl Controller for Cubic {
self.cwnd
}

fn cwnd(&self) -> usize {
self.cwnd
}

fn ssthresh(&self) -> usize {
self.ssthresh
}

fn on_retransmit(&mut self, now: Instant) {
self.w_max = self.cwnd;
self.ssthresh = self.cwnd >> 1;
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8 changes: 8 additions & 0 deletions src/socket/tcp/congestion/no_control.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,4 +8,12 @@ impl Controller for NoControl {
fn window(&self) -> usize {
usize::MAX
}

fn cwnd(&self) -> usize {
0
}

fn ssthresh(&self) -> usize {
usize::MAX
}
}
8 changes: 8 additions & 0 deletions src/socket/tcp/congestion/reno.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,14 @@ impl Controller for Reno {
self.ssthresh = (self.cwnd >> 1).max(self.min_cwnd);
}

fn cwnd(&self) -> usize {
self.cwnd
}

fn ssthresh(&self) -> usize {
self.ssthresh
}

fn on_retransmit(&mut self, _now: Instant) {
self.cwnd = (self.cwnd >> 1).max(self.min_cwnd);
}
Expand Down
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