This module matches the netfilter mark field associated with a packet
(which can be set using the
.B MARK
target below).
.TP
.BR "--mark " "\fIvalue\fP[/\fImask\fP]"
Matches packets with the given unsigned mark value (if a \fImask\fP is
specified, this is logically ANDed with the \fImask\fP before the
comparison).