| This target provides userspace logging of matching packets. When this |
| target is set for a rule, the Linux kernel will multicast this packet |
| through a |
| .IR netlink |
| socket. One or more userspace processes may then subscribe to various |
| multicast groups and receive the packets. |
| Like LOG, this is a "non-terminating target", i.e. rule traversal |
| continues at the next rule. |
| .TP |
| \fB\-\-ulog\-nlgroup\fP \fInlgroup\fP |
| This specifies the netlink group (1-32) to which the packet is sent. |
| Default value is 1. |
| .TP |
| \fB\-\-ulog\-prefix\fP \fIprefix\fP |
| Prefix log messages with the specified prefix; up to 32 characters |
| long, and useful for distinguishing messages in the logs. |
| .TP |
| \fB\-\-ulog\-cprange\fP \fIsize\fP |
| Number of bytes to be copied to userspace. A value of 0 always copies |
| the entire packet, regardless of its size. Default is 0. |
| .TP |
| \fB\-\-ulog\-qthreshold\fP \fIsize\fP |
| Number of packet to queue inside kernel. Setting this value to, e.g. 10 |
| accumulates ten packets inside the kernel and transmits them as one |
| netlink multipart message to userspace. Default is 1 (for backwards |
| compatibility). |
| .br |
