Feat/flowbit prefilter/v25 #12380
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Feat/flowbit prefilter/v25 #12380
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In preparation of flowbit prefilter work that needs this info earlier. Track potential prefilter sm's to avoid unnecessary looping during setup.
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #12380 +/- ##
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+ Coverage 82.46% 82.49% +0.03%
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Files 914 914
Lines 258316 258749 +433
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+ Hits 213030 213466 +436
+ Misses 45286 45283 -3
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victorjulien
commented
Jan 13, 2025
victorjulien
commented
Jan 13, 2025
Allow for more efficient rules that 'prefilter' on flowbits with 'isset' logic. This prefilter is enabled by default, which means that if no mpm is present or no explicit prefilter is used, the flowbits prefilter will be set up for a rule. flowbits 'isset' prefilter For rules that have a 'flowbits:isset,<bit>' statement, a "regular" prefilter facility is created. It means that the rules are removed from the normal match list(s) and added to a prefilter engine that runs prior to the individual rule inspection stage. Implementation: the prefilter is implemented as an RB_TREE of flowbits, with the rule id's they "enable" stored per tree node. The matching logic is walking the list of bits set in the flow and looking each of them up in the RB_TREE, adding the rule ids of each of the matching bits to the list of rule candidates. The 'isset' prefilter has one important corner case, which is that bits can in fact be set during the rule evaluation stage. This is different from all other prefilter engines, that evaluate an immutable state (for the lifetime of the packets inspection). flowbits 'set' post-match prefilter For flowbits 'set' action, special post-match 'prefilter' facilities deal with this corner case. The high level logic is that these track which 'isset' sigs depend on them, and add these dependencies to the candidates list when a 'set' action occurs. This is implemented in a few steps: 1. flowbits 'set' is flagged 2. when 'set' action occurs the flowbit is added to a "post rule match work queue" 3. when the rule evaluation ends, the post-match "prefilter" engine is run on each of the flowbits in the "post rule match work queue" 4. these engines ammend the candidates list with the rule id dependencies for the flowbit 5. the candidates list is sorted to make sure within the execution for that packet the inspection order is maintained Ticket: OISF#2486.
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Information: QA ran without warnings. Pipeline 24198 |
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SV_BRANCH=OISF/suricata-verify#2231
https://redmine.openinfosecfoundation.org/issues/2486
Address part of issues in #12132, will review more here.