[role="xpack"]
[testenv="basic"]
[[network-direction-processor]]
=== Network direction processor
++++
<titleabbrev>Network direction</titleabbrev>
++++

Calculates the network direction given a source IP address, destination IP
address, and a list of internal networks.

The network direction processor reads IP addresses from
{ecs-ref}[Elastic Common Schema (ECS)] fields by default. If you use the ECS,
only the `internal_networks` option must be specified.

[[network-direction-options]]
.Network Direction Options
[options="header"]
|======
| Name               | Required | Default       | Description
| `source_ip`        | no       | `source.ip`   | Field containing the source IP address.
| `destination_ip`   | no       | `destination.ip` | Field containing the destination IP address.
| `target_field`     | no       | `network.direction` | Output field for the network direction.
| `internal_networks`| yes *    |               | List of internal networks. Supports IPv4 and
IPv6 addresses and ranges in CIDR notation. Also supports the named ranges listed below. These may be constructed with <<template-snippets,template snippets>>. * Must specify only one of `internal_networks` or `internal_networks_field`.
| `internal_networks_field`| no      |               | A field on the given document to read the `internal_networks` configuration from.
| `ignore_missing`   | no       | `true`        | If `true` and any required fields are missing,
the processor quietly exits without modifying the document.


include::common-options.asciidoc[]
|======

One of either `internal_networks` or `internal_networks_field` must be specified. If `internal_networks_field` is specified, it follows the behavior specified by `ignore_missing`.

[float]
[[supported-named-network-ranges]]
===== Supported named network ranges

The named ranges supported for the `internal_networks` option are:

- `loopback` - Matches loopback addresses in the range of `127.0.0.0/8` or
  `::1/128`.
- `unicast` or `global_unicast` - Matches global unicast addresses defined in
   RFC 1122, RFC 4632, and RFC 4291 with the exception of the IPv4 broadcast
   address (`255.255.255.255`). This includes private address ranges.
- `multicast` - Matches multicast addresses.
- `interface_local_multicast` - Matches IPv6 interface-local multicast addresses.
- `link_local_unicast` - Matches link-local unicast addresses.
- `link_local_multicast` - Matches link-local multicast addresses.
- `private` - Matches private address ranges defined in RFC 1918 (IPv4) and
  RFC 4193 (IPv6).
- `public` - Matches addresses that are not loopback, unspecified, IPv4
  broadcast, link local unicast, link local multicast, interface local
  multicast, or private.
- `unspecified` - Matches unspecified addresses (either the IPv4 address
  "0.0.0.0" or the IPv6 address "::").


[discrete]
[[network-direction-processor-ex]]
===== Examples

The following example illustrates the use of the network direction processor:

[source,console]
----
POST _ingest/pipeline/_simulate
{
  "pipeline": {
    "processors": [
      {
        "network_direction": {
          "internal_networks": ["private"]
        }
      }
    ]
  },
  "docs": [
    {
      "_source": {
        "source": {
          "ip": "128.232.110.120"
        },
        "destination": {
          "ip": "192.168.1.1"
        }
      }
    }
  ]
}
----

Which produces the following result:

[source,console-result]
----
{
  "docs": [
    {
      "doc": {
        ...
        "_type": "_doc",
        "_source": {
          "destination": {
            "ip": "192.168.1.1"
          },
          "source": {
            "ip": "128.232.110.120"
          },
          "network": {
            "direction": "inbound"
          }
        }
      }
    }
  ]
}
----
// TESTRESPONSE[s/\.\.\./"_index":"_index","_id":"_id","_ingest":{"timestamp":$body.docs.0.doc._ingest.timestamp},/]
// NOTCONSOLE
