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-rw-r--r--pkg/tcpip/transport/tcp/snd.go9
1 files changed, 8 insertions, 1 deletions
diff --git a/pkg/tcpip/transport/tcp/snd.go b/pkg/tcpip/transport/tcp/snd.go
index 1f9b1e0ef..735edfe55 100644
--- a/pkg/tcpip/transport/tcp/snd.go
+++ b/pkg/tcpip/transport/tcp/snd.go
@@ -664,7 +664,14 @@ func (s *sender) maybeSendSegment(seg *segment, limit int, end seqnum.Value) (se
segEnd = seg.sequenceNumber.Add(1)
// Transition to FIN-WAIT1 state since we're initiating an active close.
s.ep.mu.Lock()
- s.ep.state = StateFinWait1
+ switch s.ep.state {
+ case StateCloseWait:
+ // We've already received a FIN and are now sending our own. The
+ // sender is now awaiting a final ACK for this FIN.
+ s.ep.state = StateLastAck
+ default:
+ s.ep.state = StateFinWait1
+ }
s.ep.mu.Unlock()
} else {
// We're sending a non-FIN segment.