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tcp: mss honoring; accept syn with ECE/CWR flags; add RSTQueue type (#41)

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* tcp: mss honoring; accept syn with ECE/CWR flags; add RSTQueue type

* tcp: move option logic to own file

* remove prints in pcap

* add MSS send threshold inspired by linux/freebsd/lwip thresh
This commit is contained in:
Pat Whittingslow
2026-02-25 16:58:55 +01:00
committed by GitHub
parent 58a9bf57e5
commit be949d960c
10 changed files with 570 additions and 191 deletions
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tcp/control.go
+5
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@@ -122,6 +122,7 @@ type sendSpace struct {
UNA Value // send unacknowledged. Seqs equal to UNA and above have NOT been acked by remote. Corresponds to local data.
NXT Value // send next. This seq and up to UNA+WND-1 are allowed to be sent. Corresponds to local data.
WND Size // send window defined by remote. Permitted number of local unacked octets in flight.
MSS Size // maximum segment size advertised by remote peer. 0 means not set.
// WL1 Value // segment sequence number used for last window update
// WL2 Value // segment acknowledgment number used for last window update
}
@@ -203,6 +204,10 @@ func (tcb *ControlBlock) PendingSegment(payloadLen int) (_ Segment, ok bool) {
}
payloadLen = int(maxPayload)
}
// Cap by remote MSS.
if tcb.snd.MSS > 0 && payloadLen > int(tcb.snd.MSS) {
payloadLen = int(tcb.snd.MSS)
}
if payloadLen > 0 {
pending |= FlagPSH // By default ensure all data flushed to destination application immediately on receive.
}