| Module matches or adds connlabels to a connection. |
| connlabels are similar to connmarks, except labels are bit-based; i.e. |
| all labels may be attached to a flow at the same time. |
| Up to 128 unique labels are currently supported. |
| .TP |
| [\fB!\fP] \fB\-\-label\fP \fBname\fP |
| matches if label \fBname\fP has been set on a connection. |
| Instead of a name (which will be translated to a number, see EXAMPLE below), |
| a number may be used instead. Using a number always overrides connlabel.conf. |
| .TP |
| \fB\-\-set\fP |
| if the label has not been set on the connection, set it. |
| Note that setting a label can fail. This is because the kernel allocates the |
| conntrack label storage area when the connection is created, and it only |
| reserves the amount of memory required by the ruleset that exists at |
| the time the connection is created. |
| In this case, the match will fail (or succeed, in case \fB\-\-label\fP |
| option was negated). |
| .PP |
| Label translation is done via the \fB/etc/xtables/connlabel.conf\fP configuration file. |
| .PP |
| Example: |
| .IP |
| .nf |
| 0 eth0-in |
| 1 eth0-out |
| 2 ppp-in |
| 3 ppp-out |
| 4 bulk-traffic |
| 5 interactive |
| .fi |
| .PP |