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git://git.code.sf.net/p/xtables-addons/xtables-addons
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f6b8767228
psd multiplies weight_thresh by HZ, so it could overflow. Userspace libxt_psd refuses values exceeding PSD_MAX_RATE, so check that on kernel side, too. Also, setting 0 weight for both privileged and highports will cause psd to never match at all. Reject 0 weight threshold, too because it makes no sense (triggers match for every initial packet).
PSD (Portscan Detection) External extensions for Xtables-addons Example: iptables -A INPUT -m psd --psd-weight-threshold 21 --psd-delay-threshold 300 --psd-lo-ports-weight 1 --psd-hi-ports-weight 10 -j LOG --log-prefix "PSD: "