stream: improve 3whs completed by ACK with data #11805
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If the ACK completing the 3whs, the stream engine will transition to "established". However, the packet itself will not be tagged as "established". This will only happen for the next packet after the 3whs, so that `flow:established` only matches after the 3whs. It is also possible that the ACK completing the 3whs was lost. Since the ACK packets themself are not acknoledged, there will be no retransmission of them. Instead, the next packet can have the ACK flag as well as data. This case was mishandled in a suble way. The stream engine state transition was done correctly, as well as the data handling and app-layer updates. However, the packet itself was not tagged as "established", which meant that `flow:established` would not yet match. This patch detects this case and tags the packet as established if ACK with data is received that completes the 3whs. Bug: OISF#7264.
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #11805 +/- ##
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Coverage ? 82.59%
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Files ? 919
Lines ? 249009
Branches ? 0
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Hits ? 205664
Misses ? 43345
Partials ? 0
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Information: QA ran without warnings. Pipeline 22761 |
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If the ACK completing the 3whs, the stream engine will transition to "established". However, the packet itself will not be tagged as "established". This will only happen for the next packet after the 3whs, so that
flow:establishedonly matches after the 3whs.It is also possible that the ACK completing the 3whs was lost. Since the ACK packets themself are not acknoledged, there will be no retransmission of them. Instead, the next packet can have the ACK flag as well as data.
This case was mishandled in a suble way. The stream engine state transition was done correctly, as well as the data handling and app-layer updates. However, the packet itself was not tagged as "established", which meant that
flow:establishedwould not yet match.This patch detects this case and tags the packet as established if ACK with data is received that completes the 3whs.
Bug: #7264.
SV_BRANCH=OISF/suricata-verify#2051