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- 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
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