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Differential D55489

tcp: improve handling of segments in TIME WAIT
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Authored by tuexen on Feb 24 2026, 3:13 PM.
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rGf3364d3c8c87: tcp: improve handling of segments in TIME WAIT
Summary

The check for excluding duplicate ACKs needs to consider only TH_SYN and TH_FIN. We know that TH_ACK is set and TH_RST is cleared. All other flags, in particular TH_ECE, TH_CWR, and TH_AE needs to be ignored for the check.

This fixes the ACK war reported in PR 292293.

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rG FreeBSD src repository
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sys/
netinet/
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sys/netinet/tcp_timewait.c

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