add security client section for in_tcp

Signed-off-by: Sri Ramana <g.sriramana@gmail.com>

Author: Sri Ramana

plugins/input/tcp.md

@@ -159,6 +159,36 @@ This section is for using TLS transport.
 
 Without `<transport tls>`, in\_tcp uses raw TCP.
 
+### &lt;security&gt; section
+
+| required | multi | version |
+|:---------|:------|:--------|
+| false    | false |  1.7.2  |
+
+Add `<security>/<client>` section to allow access by Host/IP/Network
+
+#### `<client>` section
+
+##### host
+
+| type   | default | version |
+|:-------|:--------|:--------|
+| string | nil     | 1.7.2   |
+
+The IP address or host name of the client.
+
+This is exclusive with `network`.
+
+##### network
+
+| type   | default | version |
+|:-------|:--------|:--------|
+| string | nil     | 1.7.2   |
+
+Network address specification.
+
+This is exclusive with `host`.
+
 ### &lt;parse&gt; section
 
 | required | multi | version |