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7627756360
Add optional unique_on {src_port|dst_port} to detection_filter for
exact distinct port counting within the seconds window.
Features:
- Runtime uses a single 64k-bit (8192 bytes) union bitmap per
threshold entry with O(1) updates.
- Follows detection_filter semantics: alerting starts after the
threshold (> count), not at it.
- On window expiry, the window is reset and the current packet's
port is recorded as the first distinct of the new window.
Validation:
- unique_on requires a ported transport protocol; reject rules
that are not tcp/udp/sctp or that use ip (protocol any).
Memory management:
- Bitmap memory is bounded by detect.thresholds.memcap.
- New counters: bitmap_memuse and bitmap_alloc_fail.
Tests:
- C unit tests for parsing, distinct counting, window reset, and
allocation failure fallback.
- suricata-verify tests for distinct src/dst port counting.
Task #7928
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6 months ago | |
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| dataset-examples | ||
| dns-keywords | ||
| fast-pattern | ||
| flow-keywords | ||
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| intro | ||
| normalized-buffers | ||
| payload-keywords | ||
| pcre | ||
| rule-types | ||
| app-layer.rst | 1 year ago | |
| base64-keywords.rst | ||
| bypass-keyword.rst | 1 year ago | |
| config.rst | 1 year ago | |
| datasets.rst | 1 year ago | |
| dcerpc-keywords.rst | 11 months ago | |
| decode-layer.rst | 11 months ago | |
| dhcp-keywords.rst | ||
| differences-from-snort.rst | ||
| dnp3-keywords.rst | 9 months ago | |
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| file-keywords.rst | 10 months ago | |
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| ftp-keywords.rst | 1 year ago | |
| header-keywords.rst | 9 months ago | |
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| index.rst | 11 months ago | |
| integer-keywords.rst | 9 months ago | |
| intro.rst | 8 months ago | |
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| ipaddr.rst | ||
| ja-keywords.rst | 11 months ago | |
| kerberos-keywords.rst | 11 months ago | |
| ldap-keywords.rst | 11 months ago | |
| lua-detection.rst | 1 year ago | |
| mdns-keywords.rst | 1 year ago | |
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| mqtt-keywords.rst | 10 months ago | |
| multi-buffer-matching.rst | 11 months ago | |
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| pgsql-keywords.rst | 1 year ago | |
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| rule-types.rst | 11 months ago | |
| rules-internals.rst | 11 months ago | |
| sdp-keywords.rst | 1 year ago | |
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| thresholding.rst | 6 months ago | |
| tls-keywords.rst | 8 months ago | |
| transforms.rst | 8 months ago | |
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| websocket-keywords.rst | 10 months ago | |
| xbits.rst | 11 months ago | |