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/usr/src/xtables-addons-1.40/libxt_gradm.man is in xtables-addons-dkms 1.40-1.

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This module matches packets based on grsecurity RBAC status.
.TP
[\fB!\fP] \fB\-\-enabled\fP
Matches packets if grsecurity RBAC is enabled.
.TP
[\fB!\fP] \fB\-\-disabled\fP
Matches packets if grsecurity RBAC is disabled.