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28 lines
1.1 KiB
28 lines
1.1 KiB
This is the deprecated ipv4-only predecessor of the NFLOG target. |
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It provides userspace logging of matching packets. When this |
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target is set for a rule, the Linux kernel will multicast this packet |
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through a |
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.IR netlink |
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socket. One or more userspace processes may then subscribe to various |
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multicast groups and receive the packets. |
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Like LOG, this is a "non-terminating target", i.e. rule traversal |
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continues at the next rule. |
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.TP |
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\fB\-\-ulog\-nlgroup\fP \fInlgroup\fP |
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This specifies the netlink group (1-32) to which the packet is sent. |
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Default value is 1. |
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.TP |
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\fB\-\-ulog\-prefix\fP \fIprefix\fP |
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Prefix log messages with the specified prefix; up to 32 characters |
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long, and useful for distinguishing messages in the logs. |
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.TP |
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\fB\-\-ulog\-cprange\fP \fIsize\fP |
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Number of bytes to be copied to userspace. A value of 0 always copies |
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the entire packet, regardless of its size. Default is 0. |
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.TP |
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\fB\-\-ulog\-qthreshold\fP \fIsize\fP |
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Number of packet to queue inside kernel. Setting this value to, e.g. 10 |
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accumulates ten packets inside the kernel and transmits them as one |
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netlink multipart message to userspace. Default is 1 (for backwards |
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compatibility). |
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.br
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