/usr/src/xtables-addons-3.0/extensions/libxt_LOGMARK.man is in xtables-addons-dkms 3.0-0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | .PP
The LOGMARK target will log packet and connection marks to syslog.
.TP
\fB\-\-log\-level\fR \fIlevel\fR
A logging level between 0 and 8 (inclusive).
.TP
\fB\-\-log\-prefix\fR \fIstring\fR
Prefix log messages with the specified prefix; up to 29 bytes long, and useful
for distinguishing messages in the logs.
|