This is used to set the security mark value associated with the

packet for use by security subsystems such as SELinux.  It is

valid in the

.B security

table (for backwards compatibility with older kernels, it is also

valid in the

.B mangle

table). The mark is 32 bits wide.

.TP

\fB\-\-selctx\fP \fIsecurity_context\fP