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feat(core): SYN+ACK and FIN go once, as in Java, measured with Java FILIUS

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TcpRun loses exactly one frame (loseFirst: the card's output buffer drops
it; the sender's packet log still shows it, as with setDrop) in three new
stories: lostSynAck, lostFin, lostLastFin.

Measured: Java never repeats a SYN+ACK or a FIN. The server gives a
handshake up after one timeout (3 RTT) and closes with a FIN from SYN_RCVD
(its boundary check sometimes lets it wait twice; it means once). After its
FIN a socket waits at most five times, each wait ended by a segment or the
timeout; then it is gone. The core does the same (TCP_CLOSING_WAITS, with
TIME_WAIT in the loop) and shows CLOSED where Java leaves the state
standing (a named Java bug).

One departure: a repeated SYN in SYN_RCVD gets the SYN+ACK once more and
the wait starts anew; Java closes there, but its client never repeats the
SYN. lostSynAck is compared up to the second SYN (JAVA_UNTIL); the rest is
an engine test.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
julian.kiedaisch
2026-09-30 18:08:18 +00:00
co-authored by Claude Opus 5.5
parent a88fa1512c
commit 7e0348636c
11 changed files with 1056 additions and 40 deletions
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packages/core/test/scenarios/tcp-java-lostFin.java.json
+204
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@@ -0,0 +1,204 @@
{
"frames": {
"00000000-0000-0000-0000-000000000101": [
{
"time": 850,
"source": "02:00:00:00:01:12",
"destination": "FF:FF:FF:FF:FF:FF",
"arp": 1,
"senderIp": "192.168.0.20",
"targetIp": "192.168.0.10"
},
{
"time": 852,
"source": "02:00:00:00:01:11",
"destination": "02:00:00:00:01:12",
"arp": 2,
"senderIp": "192.168.0.10",
"targetIp": "192.168.0.20"
},
{
"time": 1079,
"source": "02:00:00:00:01:12",
"destination": "02:00:00:00:01:11",
"sourceIp": "192.168.0.20",
"destinationIp": "192.168.0.10",
"protocol": 6,
"sourcePort": 61346,
"destinationPort": 80,
"payload": null,
"tcpFlags": "S",
"sequence": 2000000,
"acknowledgement": 0
},
{
"time": 1081,
"source": "02:00:00:00:01:11",
"destination": "02:00:00:00:01:12",
"sourceIp": "192.168.0.10",
"destinationIp": "192.168.0.20",
"protocol": 6,
"sourcePort": 80,
"destinationPort": 61346,
"payload": null,
"tcpFlags": "SA",
"sequence": 1000000,
"acknowledgement": 2000001
},
{
"time": 1305,
"source": "02:00:00:00:01:12",
"destination": "02:00:00:00:01:11",
"sourceIp": "192.168.0.20",
"destinationIp": "192.168.0.10",
"protocol": 6,
"sourcePort": 61346,
"destinationPort": 80,
"payload": null,
"tcpFlags": "A",
"sequence": 2000001,
"acknowledgement": 1000001
}
],
"00000000-0000-0000-0000-000000000102": [
{
"time": 729,
"source": "02:00:00:00:01:12",
"destination": "FF:FF:FF:FF:FF:FF",
"arp": 1,
"senderIp": "192.168.0.20",
"targetIp": "192.168.0.10"
},
{
"time": 963,
"source": "02:00:00:00:01:11",
"destination": "02:00:00:00:01:12",
"arp": 2,
"senderIp": "192.168.0.10",
"targetIp": "192.168.0.20"
},
{
"time": 966,
"source": "02:00:00:00:01:12",
"destination": "02:00:00:00:01:11",
"sourceIp": "192.168.0.20",
"destinationIp": "192.168.0.10",
"protocol": 6,
"sourcePort": 61346,
"destinationPort": 80,
"payload": null,
"tcpFlags": "S",
"sequence": 2000000,
"acknowledgement": 0
},
{
"time": 1193,
"source": "02:00:00:00:01:11",
"destination": "02:00:00:00:01:12",
"sourceIp": "192.168.0.10",
"destinationIp": "192.168.0.20",
"protocol": 6,
"sourcePort": 80,
"destinationPort": 61346,
"payload": null,
"tcpFlags": "SA",
"sequence": 1000000,
"acknowledgement": 2000001
},
{
"time": 1193,
"source": "02:00:00:00:01:12",
"destination": "02:00:00:00:01:11",
"sourceIp": "192.168.0.20",
"destinationIp": "192.168.0.10",
"protocol": 6,
"sourcePort": 61346,
"destinationPort": 80,
"payload": null,
"tcpFlags": "A",
"sequence": 2000001,
"acknowledgement": 1000001
},
{
"time": 1716,
"source": "02:00:00:00:01:12",
"destination": "02:00:00:00:01:11",
"sourceIp": "192.168.0.20",
"destinationIp": "192.168.0.10",
"protocol": 6,
"sourcePort": 61346,
"destinationPort": 80,
"payload": null,
"tcpFlags": "F",
"sequence": 2000001,
"acknowledgement": 0
}
],
"00000000-0000-0000-0000-000000000103": [
{
"time": 850,
"source": "02:00:00:00:01:12",
"destination": "FF:FF:FF:FF:FF:FF",
"arp": 1,
"senderIp": "192.168.0.20",
"targetIp": "192.168.0.10"
}
]
},
"events": [
[
214,
"server oeffnen called"
],
[
715,
"client verbinden called"
],
[
1216,
"client verbinden returned"
],
[
1317,
"server oeffnen returned"
],
[
1716,
"client schliessen called"
],
[
1716,
"client schliessen returned"
],
[
1716,
"lost FIN"
]
],
"states": {
"client": [
[
715,
"CLOSED"
],
[
725,
"SYN_SENT"
],
[
1195,
"ESTABLISHED"
],
[
1717,
"FIN_WAIT_1"
]
],
"server": [
[
1317,
"ESTABLISHED"
]
]
}
}