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cidr

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cidr

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This is a community-maintained plugin! It does not ship with Logstash by default, but it is easy to install by running bin/logstash-plugin install logstash-filter-cidr.

The CIDR filter is for checking IP addresses in events against a list of network blocks that might contain it. Multiple addresses can be checked against multiple networks, any match succeeds. Upon success additional tags and/or fields can be added to the event.

Synopsis

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This plugin supports the following configuration options:

Required configuration options:

cidr {
}

Available configuration options:

Setting	Input type	Required	Default value
`add_field`	hash	No	`{}`
`add_tag`	array	No	`[]`
`address`	array	No	`[]`
`network`	array	No	`[]`
`periodic_flush`	boolean	No	`false`
`remove_field`	array	No	`[]`
`remove_tag`	array	No	`[]`

Details

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`add_field`

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Value type is hash
Default value is {}

If this filter is successful, add any arbitrary fields to this event. Field names can be dynamic and include parts of the event using the %{field}.

Example:

    filter {
      cidr {
        add_field => { "foo_%{somefield}" => "Hello world, from %{host}" }
      }
    }

    # You can also add multiple fields at once:
    filter {
      cidr {
        add_field => {
          "foo_%{somefield}" => "Hello world, from %{host}"
          "new_field" => "new_static_value"
        }
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would add field foo_hello if it is present, with the value above and the %{host} piece replaced with that value from the event. The second example would also add a hardcoded field.

`add_tag`

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Value type is array
Default value is []

If this filter is successful, add arbitrary tags to the event. Tags can be dynamic and include parts of the event using the %{field} syntax.

Example:

    filter {
      cidr {
        add_tag => [ "foo_%{somefield}" ]
      }
    }

    # You can also add multiple tags at once:
    filter {
      cidr {
        add_tag => [ "foo_%{somefield}", "taggedy_tag"]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would add a tag foo_hello (and the second example would of course add a taggedy_tag tag).

`address`

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Value type is array
Default value is []

The IP address(es) to check with. Example:

    filter {
      cidr {
        add_tag => [ "testnet" ]
        address => [ "%{src_ip}", "%{dst_ip}" ]
        network => [ "192.0.2.0/24" ]
      }
    }

`network`

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Value type is array
Default value is []

The IP network(s) to check against. Example:

    filter {
      cidr {
        add_tag => [ "linklocal" ]
        address => [ "%{clientip}" ]
        network => [ "169.254.0.0/16", "fe80::/64" ]
      }
    }

`periodic_flush`

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Value type is boolean
Default value is false

Call the filter flush method at regular interval. Optional.

`remove_field`

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Value type is array
Default value is []

If this filter is successful, remove arbitrary fields from this event. Fields names can be dynamic and include parts of the event using the %{field}

Example:

    filter {
      cidr {
        remove_field => [ "foo_%{somefield}" ]
      }
    }

    # You can also remove multiple fields at once:
    filter {
      cidr {
        remove_field => [ "foo_%{somefield}", "my_extraneous_field" ]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would remove the field with name foo_hello if it is present. The second example would remove an additional, non-dynamic field.

`remove_tag`

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Value type is array
Default value is []

If this filter is successful, remove arbitrary tags from the event. Tags can be dynamic and include parts of the event using the %{field} syntax.

Example:

    filter {
      cidr {
        remove_tag => [ "foo_%{somefield}" ]
      }
    }

    # You can also remove multiple tags at once:
    filter {
      cidr {
        remove_tag => [ "foo_%{somefield}", "sad_unwanted_tag"]
      }
    }

If the event has field "somefield" == "hello" this filter, on success, would remove the tag foo_hello if it is present. The second example would remove a sad, unwanted tag as well.

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