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tcpHandler looks rounded off, add to example

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soypat
2025-02-10 20:26:02 -03:00
parent 64a7102064
commit 0cb43c47a4
10 changed files with 184 additions and 137 deletions
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tcp/control_rcvhandlers.go
+9 -9
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@@ -14,7 +14,7 @@ func (tcb *ControlBlock) rcvListen(seg Segment) (pending Flags, err error) {
// We must respond with SYN|ACK frame after receiving SYN in listen state (three way handshake).
tcb.pending[0] = synack
tcb.state = StateSynRcvd
tcb._state = StateSynRcvd
return synack, nil
}
@@ -33,13 +33,13 @@ func (tcb *ControlBlock) rcvSynSent(seg Segment) (pending Flags, err error) {
}
if hasAck {
tcb.state = StateEstablished
tcb._state = StateEstablished
pending = FlagACK
tcb.resetRcv(tcb.rcv.WND, seg.SEQ)
} else {
// Simultaneous connection sync edge case.
pending = synack
tcb.state = StateSynRcvd
tcb._state = StateSynRcvd
tcb.resetSnd(tcb.snd.ISS, seg.WND)
tcb.resetRcv(tcb.rcv.WND, seg.SEQ)
}
@@ -56,7 +56,7 @@ func (tcb *ControlBlock) rcvSynRcvd(seg Segment) (pending Flags, err error) {
if err != nil {
return 0, err
}
tcb.state = StateEstablished
tcb._state = StateEstablished
return 0, nil
}
@@ -69,7 +69,7 @@ func (tcb *ControlBlock) rcvEstablished(seg Segment) (pending Flags, err error)
pending = FlagACK
if hasFin {
// See Figure 5: TCP Connection State Diagram of RFC 9293.
tcb.state = StateCloseWait
tcb._state = StateCloseWait
tcb.pending[1] = FlagFIN // Queue FIN for after the CloseWait ACK.
}
}
@@ -85,12 +85,12 @@ func (tcb *ControlBlock) rcvFinWait1(seg Segment) (pending Flags, err error) {
case hasFin && hasAck && seg.ACK == tcb.snd.NXT:
// Special case: Server sent a FINACK response to our FIN so we enter TimeWait directly.
// We have to check ACK against send NXT to avoid simultaneous close sequence edge case.
tcb.state = StateTimeWait
tcb._state = StateTimeWait
case hasFin:
tcb.state = StateClosing
tcb._state = StateClosing
case hasAck:
// TODO(soypat): Check if this branch does NOT need ACK queued. Online flowcharts say not needed.
tcb.state = StateFinWait2
tcb._state = StateFinWait2
default:
return 0, errFinwaitExpectedACK
}
@@ -102,6 +102,6 @@ func (tcb *ControlBlock) rcvFinWait2(seg Segment) (pending Flags, err error) {
if !seg.Flags.HasAll(finack) {
return pending, errFinwaitExpectedFinack
}
tcb.state = StateTimeWait
tcb._state = StateTimeWait
return FlagACK, nil
}