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bugfix: bare-ack acceptance in finwait2

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This commit is contained in:
Patricio Whittingslow
2026-02-23 13:28:47 -03:00
parent 7d323aae19
commit f061cbd744
2 changed files with 117 additions and 4 deletions
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tcp/control_rcvhandlers.go
+9 -4
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@@ -99,9 +99,14 @@ func (tcb *ControlBlock) rcvFinWait1(seg Segment) (pending Flags, err error) {
}
func (tcb *ControlBlock) rcvFinWait2(seg Segment) (pending Flags, err error) {
if !seg.Flags.HasAll(finack) {
return pending, errFinwaitExpectedFinack
if seg.Flags.HasAny(FlagFIN) {
tcb._state = StateTimeWait
return FlagACK, nil
}
tcb._state = StateTimeWait
return FlagACK, nil
// Bare ACKs and data are valid in FIN-WAIT-2 per RFC 9293 §3.10.7.4.
// The remote side hasn't closed yet; it may still send data.
if seg.DATALEN > 0 {
return FlagACK, nil
}
return 0, nil
}